Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlEnumerable.sol";
import "./AccessControl.sol";
import "../utils/structs/EnumerableSet.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable is IAccessControl {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, firstTokenId, batchSize);

        if (batchSize > 1) {
            // Will only trigger during construction. Batch transferring (minting) is not available afterwards.
            revert("ERC721Enumerable: consecutive transfers not supported");
        }

        uint256 tokenId = firstTokenId;

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @dev Implementation of the contract HoldTime.
 * It allows to update average hold time of the yield-bearing token.
 */

contract HoldTime is Ownable {
	address public token;
	mapping(address => uint256) private holdTimes;

	event UpdateToken(address indexed token_);
	event UpdateHoldTime(
		address indexed account_,
		uint256 oldHoldTime_,
		uint256 newHoldTime_
	);

	/**
	 * @dev Update token.
	 * @param token_ token's address
	 * @notice Emits a {UpdateToken} event indicating the updated token `token_`.
	 */
	function updateToken(address token_) external onlyOwner {
		require(token_ != address(0), "Every.finance: zero address");
		require(token_ != token, "Every.finance: no change");
		token = token_;
		emit UpdateToken(token_);
	}

	/**
	 * @dev update HoldTimes.
	 * @param account_ account's address.
	 * @param amount_  token amount.
	 * Emits a {UpdateHoldTime} event with `account_`, `oldHoldTime_` and `newHoldTime_`.
	 */
	function updateHoldTime(address account_, uint256 amount_) external {
		require(msg.sender == token, "Every.finance: caller is not token");
		uint256 oldAmount_ = IERC20(token).balanceOf(account_);
		uint256 oldHoldTime_ = holdTimes[account_];
		uint256 newHoldTime_ = (oldAmount_ *
			oldHoldTime_ +
			block.timestamp *
			amount_) / (oldAmount_ + amount_);
		holdTimes[account_] = newHoldTime_;
		emit UpdateHoldTime(account_, oldHoldTime_, newHoldTime_);
	}

	/**
	 * @dev get hold time.
	 * @param account_ investor's address.
	 * @return time_ hold time.
	 */
	function getHoldTime(address account_) public view returns (uint256 time_) {
		time_ = holdTimes[account_];
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "../libraries/FeeMinter.sol";
import "./Management.sol";
import "./Proof.sol";
import "./Token.sol";

/**
 * @dev Implementation of the contract Investment.
 * It allows the investor to depositProof/withdraw funds and the manager to validate
 * the depositProof/withdrawalProof investor requests.
 */

contract Investment is AccessControlEnumerable, Pausable {
	using Math for uint256;
	bytes32 public constant PROOF = keccak256("PROOF");
	bytes32 public constant MANAGER = keccak256("MANAGER");
	uint256 public constant MAX_PRICE = type(uint256).max;
	uint256 public currentEventId;
	uint256 public tokenPrice;
	uint256 public tokenPriceMean;
	uint256 public managementFeeLastTime;
	uint256 public depositProofTokenId = 4;
	uint256 public withdrawalProofTokenId;
	uint256 public eventBatchSize;
	uint256 public lastPerformanceFee;
	uint256 public lastManagementFee;
	uint256 public totalPerformanceFee;
	uint256 public totalManagementFee;
	address public asset;
	Token public token;
	Management public management;
	Proof public depositProof;
	Proof public withdrawalProof;
	mapping(address => bool) public allowedAssetsForDeposit;
	mapping(address => bool) public allowedAssetsForWithdrawal;
	mapping(address => uint256) public totalDepositedAsset;
	mapping(address => address) public oracles;
	mapping(address => bool) public privateInvestors;
	event UpdateManagement(address indexed management_);
	event UpdateDepositProof(address indexed depositProof_);
	event UpdateWithdrawalProof(address indexed withdrawalProof_);
	event UpdateManagementParity(address indexed managementParity_);
	event UpdateToken(address indexed token_);
	event UpdateAsset(address indexed asset_);
	event UpdateAssetForDeposit(address indexed asset_, bool state_);
	event UpdateAssetForWithdrawal(address indexed asset_, bool state_);
	event UpdateOracle(address indexed asset_, address Oracle_);
	event UpdatePrivateInvestor(address indexed account_, bool state_);
	event UpdateEventBatchSize(uint256 eventBatchSize_);
	event DepositRequest(
		address indexed account_,
		address indexed asset_,
		uint256 amount_
	);
	event CancelDepositRequest(
		address indexed account_,
		address indexed asset_,
		uint256 amount_
	);
	event WithdrawalRequest(address indexed account_, uint256 amount_);
	event CancelWithdrawalRequest(address indexed account_, uint256 amount_);
	event StartNextEvent(uint256 tokenPrice, uint256 currentEventId);

	event Validatedeposit(
		uint256 indexed tokenId_,
		uint256 validatedAmount_,
		uint256 mintedAmount_
	);
	event Validatewithdrawal(
		uint256 indexed tokenId_,
		uint256 validatedAmount_,
		uint256 SentAmount_
	);
	event MintPerformanceFee(uint256 performanceFee_);
	event MintManagementFee(uint256 managementFee_);
	event MintOrBurnInvestmentFee(
		uint256 amount_,
		bool isFee_,
		uint256 remainingAmount_
	);

	constructor(
		address token_,
		address asset_,
		address management_,
		address depositProof_,
		address withdrawalProof_,
		address admin_
	) payable {
		require(token_ != address(0), "Every.finance: zero address");
		require(management_ != address(0), "Every.finance: zero address");
		require(depositProof_ != address(0), "Every.finance: zero address");
		require(withdrawalProof_ != address(0), "Every.finance: zero address");
		require(admin_ != address(0), "Every.finance: zero address");
		token = Token(token_);
		management = Management(management_);
		depositProof = Proof(depositProof_);
		withdrawalProof = Proof(withdrawalProof_);
		if (asset_ != address(0)) {
			(bool success_, uint8 assetDecimals_) = AssetTransfer
				.tryGetAssetDecimals(IERC20(asset_));
			require(success_, "Every.finance: no decimal");
			require(assetDecimals_ <= uint8(18), "Every.finance: max decimal");
		}
		asset = asset_;
		_setupRole(DEFAULT_ADMIN_ROLE, admin_);
		_setupRole(PROOF, address(depositProof_));
		_setupRole(PROOF, address(withdrawalProof_));
	}

	receive() external payable {}

	/**
	 * @dev Update management.
	 * @param management_ management contract address
	 * Emits an {UpdateManagement} event indicating the updated management contract.
	 */
	function updateManagement(
		address management_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(management_ != address(0), "Every.finance: zero address");
		require(management_ != address(management), "Every.finance: no change");
		management = Management(management_);
		emit UpdateManagement(management_);
	}

	/**
	 * @dev Update depositProof.
	 * @param depositProof_ depositProof contract address
	 * Emits an {UpdateDepositProof} event indicating the updated depositProof contract.
	 */
	function updateDepositProof(
		address depositProof_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(depositProof_ != address(0), "Every.finance: zero address");
		require(
			depositProof_ != address(depositProof),
			"Every.finance: no change"
		);
		_revokeRole(PROOF, address(depositProof));
		_grantRole(PROOF, depositProof_);
		depositProof = Proof(depositProof_);
		emit UpdateDepositProof(depositProof_);
	}

	/**
	 * @dev Update withdrawalProof.
	 * @param withdrawalProof_ withdrawalProof contract address
	 * Emits an {UpdateWithdrawalProof} event indicating the updated withdrawalProof contract.
	 */
	function updateWithdrawalProof(
		address withdrawalProof_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(withdrawalProof_ != address(0), "Every.finance: zero address");
		require(
			withdrawalProof_ != address(withdrawalProof),
			"Every.finance: no change"
		);
		_revokeRole(PROOF, address(withdrawalProof));
		_grantRole(PROOF, withdrawalProof_);
		withdrawalProof = Proof(withdrawalProof_);
		emit UpdateWithdrawalProof(withdrawalProof_);
	}

	/**
	 * @dev Update the yield-bearing token address.
	 * @param token_ token's address.
	 * Emits an {UpdateToken} event indicating the updated token's address.
	 */
	function updateToken(address token_) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(token_ != address(0), "Every.finance: zero address");
		require(token_ != address(token), "Every.finance: no change");
		token = Token(token_);
		emit UpdateToken(token_);
	}

	/**
	 * @dev Update the reference asset.
	 * @param asset_ asset's address.
	 * Emits an {UpdateAsset} event indicating the updated asset's address.
	 */
	function updateAsset(address asset_) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(asset_ != asset, "Every.finance: no change");
		if (asset_ != address(0)) {
			(bool success_, uint8 assetDecimals_) = AssetTransfer
				.tryGetAssetDecimals(IERC20(asset_));
			require(success_, "Every.finance: no decimal");
			require(assetDecimals_ <= uint8(18), "Every.finance: max decimal");
		}
		asset = asset_;
		emit UpdateAsset(asset_);
	}

	/**
	 * @dev Update the underlying asset that investors can deposit.
	 * @param asset_ asset's address.
	 * @param state_  true to add an asset and false to remove it.
	 * Emits an {UpdateAssetForDeposit} event indicating the updated asset `asset_`.
	 */
	function updateAssetForDeposit(
		address asset_,
		bool state_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		allowedAssetsForDeposit[asset_] = state_;
		emit UpdateAssetForDeposit(asset_, state_);
	}

	/**
	 * @dev Update the underlying asset that investors can withdraw.
	 * @param asset_ asset's address.
	 * @param state_  true to add an asset and false to remove it.
	 * Emits an {UpdateAssetForWithdrawal} event indicating the updated asset `asset_`.
	 */
	function updateAssetForWithdrawal(
		address asset_,
		bool state_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		allowedAssetsForWithdrawal[asset_] = state_;
		emit UpdateAssetForWithdrawal(asset_, state_);
	}

	/**
	 * @dev Update asset's oracle.
	 * @param asset_ asset's address.
	 * @param oracle_ asset's oracle.
	 * Emits an {UpdateOracle} event indicating the updated asset's oracle `oracle_`.
	 */
	function updateOracle(
		address asset_,
		address oracle_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		oracles[asset_] = oracle_;
		emit UpdateOracle(asset_, oracle_);
	}

	/**
	 * @dev Update privateInvestors.
	 * @param account_ investor's address.
	 * @param state_  is true to add _account, false to remove it.
	 * Emits an {UpdatePrivateInvestor} event indicating  `account_` and `state_`.
	 */
	function updatePrivateInvestor(
		address account_,
		bool state_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		privateInvestors[account_] = state_;
		emit UpdatePrivateInvestor(account_, state_);
	}

	/**
	 * @dev Update eventBatchSize (maximum  number of investors to be validate by batch).
	 * @param eventBatchSize_  new eventBatchSize number.
	 * Emits an {UpdateEventBatchSize} event indicating the updated eventBatchSize `eventBatchSize_`.
	 */
	function updateEventBatchSize(
		uint256 eventBatchSize_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(eventBatchSize_ != 0, "Every.finance: zero value");
		eventBatchSize = eventBatchSize_;
		emit UpdateEventBatchSize(eventBatchSize_);
	}

	/**
	 * @dev Update ManagementFeeLastTime.
	 */
	function updateManagementFeeLastTime(
		uint256 managementFeeLastTime_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		managementFeeLastTime = managementFeeLastTime_;
	}

	/**
	 * @dev Update TokenPriceMean.
	 */
	function updateTokenPriceMean(
		uint256 tokenPriceMean_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		tokenPriceMean = tokenPriceMean_;
	}

	/**
	 * @dev start new event (manager cycle validation).
	 * Emits an {UpdateStartNextEvent} event with token price `tokenPrice` and next event id `currentEventId`.
	 *
	 */
	function startNextEvent() external onlyRole(MANAGER) {
		(tokenPrice, ) = management.tokenPrice();
		currentEventId += 1;
		emit StartNextEvent(tokenPrice, currentEventId);
	}

	/**
	 * @dev validate investor deposit requests by the manager.
	 * The deposit request consists of minting the required amount of yield-bearing token for the investor, and
	 * decreasing his pending request amount by an equivalent amount.
	 * If the deposit request is fully validated (the pending request amount is zero), the corresponding proof is burned.
	 * @param tokenIds_ array of Proof tokens ids.
	 * @param maxdeposit_  max total amount of deposit asset to validate.
	 * Emits an {Validatedeposit} event with token id `tokenId_`, validate deposit asset amount
	 * `amountAsset_` and minted token amount `amountToken_`.
	 */
	function validateDeposits(
		uint256[] calldata tokenIds_,
		uint256 maxdeposit_
	)
		external
		whenNotPaused
		onlyRole(MANAGER)
		returns (uint256 newMaxdeposit_)
	{
		require(tokenPrice != 0, "Every.finance: zero token price");
		uint256 totalSupplyToken_ = token.totalSupply();
		(
			uint256 amountAssetTotal_,
			uint256 amountTokenTotal_
		) = _validateDeposits(tokenIds_, maxdeposit_);

		unchecked {
			newMaxdeposit_ = maxdeposit_ - amountAssetTotal_;
		}
		if (amountTokenTotal_ != 0) {
			tokenPriceMean =
				((totalSupplyToken_ * tokenPriceMean) +
					(amountTokenTotal_ * tokenPrice)) /
				(totalSupplyToken_ + amountTokenTotal_);
		}
		if (managementFeeLastTime == 0) {
			managementFeeLastTime = block.timestamp;
		}
	}

	/**
	 * @dev validate investor withdrawal requests by the manager.
	 * The deposit request consists of sending the required amount of asset to the investor, and
	 * burning the equivalent amount in yield-bearing token.
	 * If the withdrawal request is fully validated (the pending request amount is zero), the corresponding proof is burned.
	 * @param tokenIds_ array of Proof tokens ids.
	 * @param maxwithdrawal_  max total amount of withdrawal to validate.
	 * Emits an {ValidateWithdrawal} event with token id `tokenId_`, validate withdrawal asset amount
	 * `amountAsset_` and burned token amount `amountToken_`.
	 */
	function validateWithdrawals(
		uint256[] calldata tokenIds_,
		uint256 maxwithdrawal_
	)
		external
		whenNotPaused
		onlyRole(MANAGER)
		returns (uint256 _newMaxwithdrawal)
	{
		require(tokenPrice != 0, "Every.finance: zero token price");
		uint256 amountTokenTotal_ = _validateWithdrawals(
			tokenIds_,
			maxwithdrawal_
		);
		unchecked {
			_newMaxwithdrawal = maxwithdrawal_ - amountTokenTotal_;
		}

		if ((amountTokenTotal_) != 0) {
			token.burn(address(this), amountTokenTotal_);
		}
	}

	/**
	 * @dev make a deposit request by the investor.
	 * the investor sends an amount of asset to the smart contracts and deposit fee to the treasury.
	 * the investor receives or updates his deposit Proof {ERC721}.
	 * @param account_ investor'address.
	 * @param asset_ asset'address.
	 * @param tokenId_ token id of the deposit Proof (if tokenId_ == 0, then a new token is minted).
	 * @param amount_ amount of asset to deposit.
	 * @param minPrice_ minimum price of yield-bearing token to be accepted.
	 * @param maxPrice_ maximum price of yield-bearing token to be accepted.
	 * @param maxFee_ maximum deposit fee to be accepted.
	 * Emits an {DepositRequest} event with account `account_` and  amount `amount_`.
	 */
	function depositRequest(
		address account_,
		address asset_,
		uint256 tokenId_,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 maxFee_
	) external payable whenNotPaused {
		uint256 fee_;
		require(amount_ != 0, "Every.finance: zero amount");
		require(
			allowedAssetsForDeposit[asset_],
			"Every.finance: not allowed asset"
		);
		require(
			amount_ >= getDepositMinAmount(asset_),
			"Every.finance: min depositProof Amount"
		);
		uint256 totalDepositedAsset_ = totalDepositedAsset[asset_];
		if (!privateInvestors[msg.sender]) {
			fee_ = getDepositFee(asset_, amount_);
			require(fee_ <= maxFee_, "Every.finance: max allowed fee");
			amount_ -= fee_;
		}
		require(
			totalDepositedAsset_ + amount_ <= management.assetCap(asset_),
			"Every.finance: cap asset"
		);
		require(
			(minPrice_ <= maxPrice_) && (maxPrice_ != 0),
			"Every.finance: wrong prices"
		);
		totalDepositedAsset[asset_] = totalDepositedAsset_ + amount_;
		if (tokenId_ == 0) {
			depositProofTokenId += 1;
			depositProof.mint(
				account_,
				asset_,
				depositProofTokenId,
				amount_,
				minPrice_,
				maxPrice_,
				currentEventId
			);
		} else {
			require(
				depositProof.ownerOf(tokenId_) == account_,
				"Every.finance: account is not owner"
			);

			(, , , , , address existedAsset_) = depositProof.pendingRequests(
				tokenId_
			);
			require(
				asset_ == existedAsset_,
				"Every.finance: existing asset is different"
			);

			if (account_ != _msgSender()) {
				(
					,
					,
					uint256 minPriceOld_,
					uint256 maxPriceOld_,
					,

				) = depositProof.pendingRequests(tokenId_);
				require(
					(minPrice_ == minPriceOld_) && (maxPrice_ == maxPriceOld_),
					"Every.finance: prices don't match"
				);
			}
			depositProof.increasePendingRequest(
				tokenId_,
				amount_,
				minPrice_,
				maxPrice_,
				currentEventId,
				asset_
			);
		}
		if (asset_ != address(0)) {
			AssetTransfer.transferFrom(
				_msgSender(),
				address(this),
				amount_ + fee_,
				IERC20(asset_)
			);
		} else {
			require(
				(msg.value == amount_ + fee_),
				"Every.finance: no required amount"
			);
		}
		if (fee_ > 0) {
			AssetTransfer.transfer(management.treasury(), fee_, asset_);
		}
		emit DepositRequest(account_, asset_, amount_);
	}

	/**
	 * @dev cancel a deposit request by the investor.
	 * the investor can cancel a full or partial amount of his deposit.
	 * the investor burns or updates his deposit Proof {ERC721}.
	 * @param tokenId_ token id of the deposit Proof (if tokenId_ == 0, then a new token is minted).
	 * @param amount_ amount of asset to cancel.
	 * Emits an {CancelDepositRequest} event with the caller and  amount `amount_`.
	 */
	function cancelDepositRequest(
		uint256 tokenId_,
		uint256 amount_
	) external whenNotPaused {
		require(
			management.isCancelDeposit(),
			"Every.finance: no deposit cancel"
		);
		require(amount_ != 0, "Every.finance: zero amount");
		require(
			depositProof.ownerOf(tokenId_) == _msgSender(),
			"Every.finance: caller is not owner"
		);
		(, , , , , address asset_) = depositProof.pendingRequests(tokenId_);
		totalDepositedAsset[asset_] -= amount_;
		depositProof.decreasePendingRequest(
			tokenId_,
			amount_,
			currentEventId,
			asset_
		);
		AssetTransfer.transfer(_msgSender(), amount_, asset_);
		emit CancelDepositRequest(_msgSender(), asset_, amount_);
	}

	/**
	 * @dev make a withdrawal request by the investor.
	 * the investor sends an amount of yield-bearing token to the smart contracts and withdrawal fee to the treasury.
	 * the investor receives or updates his withdrawal Proof {ERC721}.
	 * @param tokenId_ token id of the withdrawal Proof (if tokenId_ == 0, then a new token is minted).
	 * @param amount_ amount of yield-bearing token to withdraw.
	 * @param minPrice_ minimum price of yield-bearing token to be accepted.
	 * @param maxPrice_ maximum price of yield-bearing token to be accepted.
	 * @param maxFee_ maximum withdrawal fee to be accepted.
	 * Emits an {WithdrawalRequest} event with account `account_` and  amount `amount_`.
	 */
	function withdrawalRequest(
		uint256 tokenId_,
		address asset_,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 maxFee_
	) external whenNotPaused {
		require(amount_ != 0, "Every.finance: zero amount");
		require(
			allowedAssetsForWithdrawal[asset_],
			"Every.finance: not allowed asset"
		);
		uint256 fee_;
		require(
			token.balanceOf(_msgSender()) >= amount_,
			"Every.finance: amount exceeds balance"
		);
		if (!privateInvestors[msg.sender]) {
			uint256 holdTime_ = token.getHoldTime(_msgSender());
			if (management.isMinLockUpPeriod()) {
				require(
					block.timestamp - holdTime_ >= management.minLockUpPeriod(),
					"Every.Finance: min lokup period"
				);
			}

			fee_ =
				(management.getWithdrawalFeeRate(holdTime_) * amount_) /
				FeeMinter.SCALING_FACTOR_FEE;

			require(fee_ <= maxFee_, "Every.finance: max allowed fee");
			amount_ = amount_ - fee_;
		}
		require(
			(minPrice_ <= maxPrice_) && (maxPrice_ != 0),
			"Every.finance: wrong prices"
		);
		if (tokenId_ == 0) {
			withdrawalProofTokenId += 1;
			withdrawalProof.mint(
				_msgSender(),
				asset_,
				withdrawalProofTokenId,
				amount_,
				minPrice_,
				maxPrice_,
				currentEventId
			);
		} else {
			require(
				withdrawalProof.ownerOf(tokenId_) == _msgSender(),
				"Every.finance: caller is not owner"
			);

			(, , , , , address existedAsset_) = withdrawalProof.pendingRequests(
				tokenId_
			);

			require(
				asset_ == existedAsset_,
				"Every.finance: existing asset is different"
			);

			withdrawalProof.increasePendingRequest(
				tokenId_,
				amount_,
				minPrice_,
				maxPrice_,
				currentEventId,
				asset_
			);
		}
		token.transferFrom(_msgSender(), address(this), amount_);
		if (fee_ != 0) {
			token.transferFrom(_msgSender(), management.treasury(), fee_);
		}
		emit WithdrawalRequest(_msgSender(), amount_);
	}

	/**
	 * @dev cancel a withdrawal request by the investor.
	 * the investor can cancel a full or partial amount of his withdrawal.
	 * the investor burns or updates his withdrawal Proof {ERC721}.
	 * @param tokenId_ token id of the withdrawal Proof (if tokenId_ == 0, then a new token is minted).
	 * @param amount_ amount of yield-bearing token to cancel.
	 * Emits an {CancelWithdrawalRequest} event with the caller and  amount `amount_`.
	 */
	function cancelWithdrawalRequest(
		uint256 tokenId_,
		uint256 amount_
	) external whenNotPaused {
		require(
			management.isCancelWithdrawal(),
			"Every.finance: no withdrawal cancel"
		);
		require(amount_ != 0, "Every.finance: zero amount");
		require(
			withdrawalProof.ownerOf(tokenId_) == _msgSender(),
			"Every.finance: caller is not owner"
		);
		(, , , , , address asset_) = withdrawalProof.pendingRequests(tokenId_);
		withdrawalProof.decreasePendingRequest(
			tokenId_,
			amount_,
			currentEventId,
			asset_
		);
		token.transfer(_msgSender(), amount_);
		emit CancelWithdrawalRequest(_msgSender(), amount_);
	}

	/**
	 * @dev Send asset to the SafeHouse by the manager.
	 * @param amount_ amount to send.
	 * @param asset_  asset's address.
	 */
	function sendToSafeHouse(
		uint256 amount_,
		address asset_
	) external whenNotPaused onlyRole(MANAGER) {
		require(amount_ != 0, "Every.finance: zero amount");
		address safeHouse_ = management.safeHouse();
		require(safeHouse_ != address(0), "Every.finance: zero address");
		AssetTransfer.transfer(safeHouse_, amount_, asset_);
	}

	/**
	 * @dev mint Performance fee by the manager
	 * performance fee are minted in yield-bearing token.
	 */
	function mintPerformanceFee() external onlyRole(MANAGER) {
		(uint256 tokenPrice_, ) = management.tokenPrice();
		uint256 performanceFeeRate_ = management.performanceFeeRate();
		address treasury_ = management.treasury();
		uint256 performanceFee_;
		(tokenPriceMean, performanceFee_) = FeeMinter.mintPerformanceFee(
			tokenPrice_,
			tokenPriceMean,
			performanceFeeRate_,
			treasury_,
			address(token)
		);
		lastPerformanceFee = performanceFee_;
		totalPerformanceFee += performanceFee_;
		emit MintPerformanceFee(performanceFee_);
	}

	/**
	 * @dev mint management fee by the manager
	 * management fee are minted in yield-bearing token.
	 */
	function mintManagementFee() external onlyRole(MANAGER) {
		uint256 managementFeeRate_ = management.managementFeeRate();
		address treasury_ = management.treasury();
		uint256 managementFee_;
		(managementFeeLastTime, managementFee_) = FeeMinter.mintManagementFee(
			managementFeeLastTime,
			managementFeeRate_,
			treasury_,
			address(token)
		);
		lastManagementFee = managementFee_;
		totalManagementFee += managementFee_;
		emit MintManagementFee(managementFee_);
	}

	/**
	 * @dev mint or burn Investment fee by the manager
	 * Investment fee are minted (negative fee) Or bunred (positive fee) in yield-bearing token.
	 * @param amount_ amount of negative/positive fee.
	 * @param isFee_ true if negative fee, false otherwise.
	 */
	function mintOrBurnInvestmentFee(
		uint256 amount_,
		bool isFee_
	) external payable onlyRole(MANAGER) returns (uint256 remainingAmount_) {
		(uint256 tokenPrice_, ) = management.tokenPrice();
		address treasury_ = management.treasury();
		remainingAmount_ = FeeMinter.MintInvestmentFee(
			amount_,
			tokenPrice_,
			isFee_,
			payable(treasury_),
			address(token),
			asset
		);

		emit MintOrBurnInvestmentFee(amount_, isFee_, remainingAmount_);
	}

	/**
	 * @dev get deposit fee for a deposit amount `amount_` of asset `asset_`
	 * @param asset_ asset's address to deposit by the investor.
	 * @param amount_ amount in asset to deposit by the investor.
	 */
	function getDepositFee(
		address asset_,
		uint256 amount_
	) public view returns (uint256 fee_) {
		(uint256 price_, uint256 decimal_) = getLatestPrice(asset_);
		amount_ = (amount_ * price_) / 10 ** decimal_;
		fee_ = management.getDepositFee(amount_);
		fee_ = (fee_ * 10 ** decimal_) / price_;
		return fee_;
	}

	/**
	 * @dev get  yield-bearing token price.
	 */
	function getTokenPrice() public view returns (uint256 price_) {
		(price_, ) = management.tokenPrice();
	}

	/**
	 * @dev get minimum deposit amount.
	 */

	function getDepositMinAmount(
		address asset_
	) public view returns (uint256 amount_) {
		amount_ = management.minDepositAmount();
		(uint256 price_, uint256 decimal_) = getLatestPrice(asset_);
		amount_ = (amount_ * 10 ** decimal_) / price_;
	}

	/**
	 * @dev verify if the price bounds of deposit/withdrawal pending request are valid.
	 * @param proof_ Proof contract'address.
	 * @param tokenId_  token id of the pending request.
	 * @return isValid_ true if price bounds are valid , fase otherwise.
	 */
	function isValidPrice(
		Proof proof_,
		uint256 tokenId_
	) public view returns (bool isValid_) {
		(, , uint256 minPrice_, uint256 maxPrice_, , ) = proof_.pendingRequests(
			tokenId_
		);
		isValid_ = (minPrice_ <= tokenPrice) && (maxPrice_ >= tokenPrice);
	}

	function getLatestPrice(
		address asset_
	) public view returns (uint256, uint256) {
		address oracle_ = oracles[asset_];
		AggregatorV3Interface priceFeed = AggregatorV3Interface(oracle_);
		(
			,
			/*uint80 roundID*/ int price /*uint startedAt*/ /*uint timeStamp*/ /*uint80 answeredInRound*/,
			,
			,

		) = priceFeed.latestRoundData();
		require(price > 0, "Every.finance: invalid price");
		uint8 decimals_ = priceFeed.decimals();
		return (uint256(price), decimals_);
	}

	function _validateDeposits(
		uint256[] calldata tokenIds_,
		uint256 maxdeposit_
	) internal returns (uint256 amountAssetTotal_, uint256 amountTokenTotal_) {
		uint256 amountAsset_;
		uint256 amountToken_;
		uint256 price_;
		uint256 decimal_;
		uint256 size_ = tokenIds_.length;
		address owner_;
		address asset_;
		require(size_ != 0, "Every.finance: size is zero");
		require(size_ <= eventBatchSize, "Every.finance: max size");
		for (uint256 i = 0; i < size_; ) {
			owner_ = depositProof.ownerOf(tokenIds_[i]);
			require(owner_ != address(0), "Every.finance: zero address");
			if (!isValidPrice(depositProof, tokenIds_[i])) {
				depositProof.updateEventId(tokenIds_[i], currentEventId);
			} else {
				if (maxdeposit_ <= amountAssetTotal_) {
					break;
				}
				depositProof.preValidatePendingRequest(
					tokenIds_[i],
					currentEventId
				);
				(amountAsset_, , , , , asset_) = depositProof.pendingRequests(
					tokenIds_[i]
				);
				(price_, decimal_) = getLatestPrice(asset_);
				amountAsset_ = Math.mulDiv(
					amountAsset_,
					price_,
					10 ** decimal_
				);
				amountAsset_ = Math.min(
					maxdeposit_ - amountAssetTotal_,
					amountAsset_
				);

				unchecked {
					amountAssetTotal_ += amountAsset_;
				}
				amountToken_ = Math.mulDiv(
					amountAsset_,
					FeeMinter.SCALING_FACTOR_PRICE,
					tokenPrice
				);

				if (amountToken_ != 0) {
					token.mint(owner_, amountToken_);
					amountTokenTotal_ += amountToken_;
				}

				amountAsset_ = Math.mulDiv(
					amountAsset_,
					10 ** decimal_,
					price_
				);
				depositProof.validatePendingRequest(
					tokenIds_[i],
					amountAsset_,
					currentEventId,
					asset_
				);

				emit Validatedeposit(tokenIds_[i], amountAsset_, amountToken_);
			}
			unchecked {
				i++;
			}
		}
	}

	function _validateWithdrawals(
		uint256[] calldata tokenIds_,
		uint256 maxwithdrawal_
	) internal returns (uint256 amountTokenTotal_) {
		uint256 amountToken_;
		uint256 amountAsset_;
		uint256 size_ = tokenIds_.length;
		uint256 tokenId_;
		address owner_;
		address asset_;
		uint256 price_;
		uint256 decimal_;
		require(size_ != 0, "Every.finance: size is zero");
		require(size_ <= eventBatchSize, "Every.finance: max size");
		uint256 amountTotal_ = withdrawalProof.totalAmount();
		for (uint256 i = 0; i < size_; ) {
			tokenId_ = tokenIds_[i];
			owner_ = withdrawalProof.ownerOf(tokenId_);
			require(owner_ != address(0), "Every.finance: zero address");
			if (!isValidPrice(withdrawalProof, tokenId_)) {
				withdrawalProof.updateEventId(tokenId_, currentEventId);
			} else {
				withdrawalProof.preValidatePendingRequest(
					tokenId_,
					currentEventId
				);
				(amountToken_, , , , , asset_) = withdrawalProof
					.pendingRequests(tokenId_);
				amountToken_ = Math.min(
					Math.mulDiv(maxwithdrawal_, amountToken_, amountTotal_),
					amountToken_
				);
				unchecked {
					amountTokenTotal_ += amountToken_;
				}

				withdrawalProof.validatePendingRequest(
					tokenId_,
					amountToken_,
					currentEventId,
					asset_
				);
				amountAsset_ = Math.mulDiv(
					amountToken_,
					tokenPrice,
					FeeMinter.SCALING_FACTOR_PRICE
				);

				(price_, decimal_) = getLatestPrice(asset_);
				amountAsset_ = Math.mulDiv(
					amountAsset_,
					10 ** decimal_,
					price_
				);

				if (amountAsset_ != 0) {
					AssetTransfer.transfer(owner_, amountAsset_, asset_);
				}

				emit Validatewithdrawal(tokenId_, amountToken_, amountAsset_);
			}
			unchecked {
				i++;
			}
		}
	}

	function pause() public onlyRole(DEFAULT_ADMIN_ROLE) {
		_pause();
	}

	function unpause() public onlyRole(DEFAULT_ADMIN_ROLE) {
		_unpause();
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";

/**
 * @dev Implementation of the contract Management.
 * It allows the manager to set the different parameters of the product.
 */
contract Management is AccessControlEnumerable {
	bytes32 public constant MANAGER = keccak256("MANAGER");
	bytes32 public constant ORACLE = keccak256("ORACLE");
	uint256 public constant SCALING_FACTOR = 1e8;

	struct Fee {
		uint256 rate;
		uint256 time;
	}

	struct Price {
		uint256 value;
		uint256 time;
	}

	struct DepositFee {
		uint256 rate;
		uint256 minValue;
		uint256 maxValue;
	}

	uint256 public managementFeeRate;
	uint256 public performanceFeeRate;
	uint256 public minDepositAmount;
	uint256 public minLockUpPeriod;
	Price public tokenPrice;
	DepositFee public depositFee;
	Fee[] public withdrawalFee;
	bool public isCancelDeposit;
	bool public isCancelWithdrawal;
	bool public isMinLockUpPeriod;
	address public treasury;
	address public safeHouse;
	mapping(address => uint256) public assetCap;

	event UpdateTreasury(address indexed treasury_);
	event UpdateSafeHouse(address indexed safeHouse_);
	event UpdateIsCancelDeposit(bool iscancelDeposit_);
	event UpdateIsCancelWithdrawal(bool isWithdrawalCancel_);
	event UpdateIsMinLockUpPeriod(bool isMinLockUpPeriod_);
	event UpdateMinLockUpPeriod(uint256 minLockUpPeriod_);
	event UpdateDepositFee(uint256 rate_, uint256 minValue_, uint256 maxValue_);
	event UpdateManagementFeeRate(uint256 managementFeeRate_);
	event UpdatePerformanceFeeRate(uint256 performanceFeeRate_);
	event UpdateMinDepositAmount(uint256 minDepositAmount_);
	event UpdateTokenPrice(Price price_);
	event AddWithdrawalFee(uint256 rate_, uint256 time_);
	event UpdateWithdrawalFee(uint256 index_, uint256 rate_, uint256 time_);
	event DeleteLastWithdrawalFee(uint256 rate_, uint256 time_);
	event UpdateAssetCap(address indexed asset_, uint256 cap_);

	constructor(address admin_, address manager_, address treasury_) {
		require(admin_ != address(0), "Every.finance: zero address");
		require(manager_ != address(0), "Every.finance: zero address");
		require(treasury_ != address(0), "Every.finance: zero address");
		treasury = treasury_;
		_setupRole(DEFAULT_ADMIN_ROLE, admin_);
		_setupRole(MANAGER, manager_);
	}

	/**
	 * @dev Update treasury.
	 * @param treasury_.
	 * Emits an {UpdateTreasury} event indicating the updated treasury `treasury_`.
	 */
	function updateTreasury(
		address treasury_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(treasury_ != address(0), "Every.finance: zero address");
		require(treasury != treasury_, "Every.finance: no change");
		treasury = treasury_;
		emit UpdateTreasury(treasury_);
	}

	/**
	 * @dev Update safeHouse.
	 * @param safeHouse_.
	 * Emits an {UpdateSafeHouse} event indicating the updated safeHouse `safeHouse_`.
	 */
	function updateSafeHouse(
		address safeHouse_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(safeHouse_ != address(0), "Every.finance: zero address");
		require(safeHouse != safeHouse_, "Every.finance: no change");
		safeHouse = safeHouse_;
		emit UpdateSafeHouse(safeHouse_);
	}

	/**
	 * @dev Update isCancelDeposit.
	 * @param  isCancelDeposit_.
	 * Emits an {UpdateIsCancelDeposit} event indicating the updated  isCancelDeposit ` isCancelDeposit_`.
	 */
	function updateIsCancelDeposit(
		bool isCancelDeposit_
	) external onlyRole(MANAGER) {
		require(
			isCancelDeposit_ != isCancelDeposit,
			"Every.finance: no change"
		);
		isCancelDeposit = isCancelDeposit_;
		emit UpdateIsCancelDeposit(isCancelDeposit_);
	}

	/**
	 * @dev Update isCancelWithdrawal.
	 * @param  isCancelWithdrawal_.
	 * Emits an {UpdateIsCancelWithdrawal} event indicating the updated  isCancelWithdrawal ` isCancelWithdrawal_`.
	 */
	function updateIsCancelWithdrawal(
		bool isCancelWithdrawal_
	) external onlyRole(MANAGER) {
		require(
			isCancelWithdrawal_ != isCancelWithdrawal,
			"Every.finance: no change"
		);
		isCancelWithdrawal = isCancelWithdrawal_;
		emit UpdateIsCancelWithdrawal(isCancelWithdrawal_);
	}

	/**
	 * @dev Update isMinLockUpPeriod.
	 * @param  isMinLockUpPeriod_.
	 * Emits an {UpdateIsMinLockUpPeriod} event indicating the updated  isMinLockUpPeriod ` isMinLockUpPeriod_`.
	 */
	function updateIsMinLockUpPeriod(
		bool isMinLockUpPeriod_
	) external onlyRole(MANAGER) {
		require(
			isMinLockUpPeriod_ != isMinLockUpPeriod,
			"Every.finance: no change"
		);
		isMinLockUpPeriod = isMinLockUpPeriod_;
		emit UpdateIsMinLockUpPeriod(isMinLockUpPeriod_);
	}

	/**
	 * @dev Update minLockUpPeriod.
	 * @param  minLockUpPeriod_ minimum locked up period
	 * Emits an {UpdateMinLockUpPeriod_} event indicating the updated minLockUpPeriod_ `minLockUpPeriod_`
	 * and max value `maxValue_`
	 */
	function updateMinLockUpPeriod(
		uint256 minLockUpPeriod_
	) external onlyRole(MANAGER) {
		minLockUpPeriod = minLockUpPeriod_;
		emit UpdateMinLockUpPeriod(minLockUpPeriod_);
	}

	/**
	 * @dev Update depositFee.
	 * @param  rate_.
	 * @param  minValue_.
	 * @param  maxValue_.
	 * Emits an {UpdateDepositFee} event indicating the updated rate `rate_`, min value `minValue_`
	 * and max value `maxValue_`
	 */
	function updateDepositFee(
		uint256 rate_,
		uint256 minValue_,
		uint256 maxValue_
	) external onlyRole(MANAGER) {
		require(rate_ <= SCALING_FACTOR, "Every.finance: out of range");
		require(minValue_ <= maxValue_, "Every.finance: wrong min max values");
		depositFee = DepositFee(rate_, minValue_, maxValue_);
		emit UpdateDepositFee(rate_, minValue_, maxValue_);
	}

	/**
	 * @dev Update managementFeeRate.
	 * @param managementFeeRate_.
	 * Emits an {UpdateManagementFeeRate} event indicating the updated managementFeeRate `managementFeeRate_`.
	 */

	function updateManagementFeeRate(
		uint256 managementFeeRate_
	) external onlyRole(MANAGER) {
		require(
			managementFeeRate_ <= SCALING_FACTOR,
			"Every.finance: out of range"
		);
		managementFeeRate = managementFeeRate_;
		emit UpdateManagementFeeRate(managementFeeRate_);
	}

	/**
	 * @dev Update performanceFeeRate.
	 * @param performanceFeeRate_.
	 * Emits an {UpdatePerformanceFeeRate} event indicating the updated performanceFeeRate `performanceFeeRate_`.
	 */

	function updatePerformanceFeeRate(
		uint256 performanceFeeRate_
	) external onlyRole(MANAGER) {
		require(
			performanceFeeRate_ <= SCALING_FACTOR,
			"Every.finance: out of range"
		);
		performanceFeeRate = performanceFeeRate_;
		emit UpdatePerformanceFeeRate(performanceFeeRate_);
	}

	/**
	 * @dev Update MinDepositAmount.
	 * @param minDepositAmount_.
	 * Emits an {UpdateMinDepositAmount} event indicating the updated minDepositAmount `minDepositAmount_`.
	 */

	function updateMinDepositAmount(
		uint256 minDepositAmount_
	) external onlyRole(MANAGER) {
		require(
			depositFee.minValue <= minDepositAmount_,
			"Every.finance: lower than min deposit fee"
		);
		minDepositAmount = minDepositAmount_;
		emit UpdateMinDepositAmount(minDepositAmount_);
	}

	/**
	 * @dev Update tokenPrice.
	 * @param price_.
	 * Emits an {UpdateTokenPrice} event indicating the updated tokenPrice.
	 */
	function updateTokenPrice(uint256 price_) external onlyRole(ORACLE) {
		require(price_ != 0, "Every.finance: zero price");
		tokenPrice = Price(price_, block.timestamp);
		emit UpdateTokenPrice(tokenPrice);
	}

	/**
	 * @dev add a new withdrawal fee.
	 * @param rate_.
	 * @param time_.
	 * Emits an {AddWithdrawalFee} event with feeRate `rate_` and feePeriod `time_`.
	 */

	function addWithdrawalFee(
		uint256 rate_,
		uint256 time_
	) external onlyRole(MANAGER) {
		require(rate_ <= SCALING_FACTOR, "Every.finance: out of range");
		uint256 size_ = withdrawalFee.length;
		if (size_ != 0) {
			require(
				withdrawalFee[size_ - 1].time < time_,
				"Every.finance: times don't match"
			);
			require(
				withdrawalFee[size_ - 1].rate > rate_,
				"Every.finance: fee rates don't match"
			);
		}
		withdrawalFee.push(Fee(rate_, time_));
		emit AddWithdrawalFee(rate_, time_);
	}

	/**
	 * @dev Update withdrawal fee.
	 * @param index_ index of array withdrawalFee to be updated.
	 * @param rate_ new fee.
	 * @param time_ new period.
	 * Emits an {UpdateWithdrawalFee} event with `index_`, `rate_`, and 'time_'.
	 */

	function updateWithdrawalFee(
		uint256 index_,
		uint256 rate_,
		uint256 time_
	) external onlyRole(MANAGER) {
		require(rate_ <= SCALING_FACTOR, "Every.finance: out of range");
		uint256 size_ = withdrawalFee.length;
		require(index_ < size_, "Every.finance: out of size");
		if (index_ != 0) {
			require(
				withdrawalFee[index_ - 1].time < time_,
				"Every.finance: times don't match"
			);
			require(
				withdrawalFee[index_ - 1].rate > rate_,
				"Every.finance: fee rates don't match"
			);
		}
		if (index_ < size_ - 1) {
			require(
				withdrawalFee[index_ + 1].time > time_,
				"Every.finance: times don't match"
			);
			require(
				withdrawalFee[index_ + 1].rate < rate_,
				"Every.finance: fee rates don't match"
			);
		}
		withdrawalFee[index_] = Fee(rate_, time_);
		emit UpdateWithdrawalFee(index_, rate_, time_);
	}

	/**
	 * @dev delete last fee from  withdrawalFee.
	 * Emits an {DeleteLastWithdrawalFee} event with the removed fee.
	 */

	function deleteLastWithdrawalFee() external onlyRole(MANAGER) {
		uint256 size_ = withdrawalFee.length;
		require(size_ != 0, "Every.finance. array is empty");
		Fee memory fee_ = withdrawalFee[size_ - 1];
		withdrawalFee.pop();
		emit DeleteLastWithdrawalFee(fee_.rate, fee_.time);
	}

	/**
	 * @dev calculate withdrawal fee rate.
	 * @param holdTime_ hold time of the yield-bearing tokens.
	 */

	function calculateWithdrawalFeeRate(
		uint256 holdTime_
	) public view returns (uint256) {
		uint256 size_ = withdrawalFee.length;
		require(block.timestamp >= holdTime_, "Every.finance: max time");
		uint256 deltaTime_;
		unchecked {
			deltaTime_ = block.timestamp - holdTime_;
		}
		if (size_ == 0) {
			return 0;
		} else if (deltaTime_ <= withdrawalFee[0].time) {
			return withdrawalFee[0].rate;
		} else if (deltaTime_ > withdrawalFee[size_ - 1].time) {
			return 0;
		} else {
			uint256 time_;
			Fee memory fee_;
			for (uint256 i = 0; i < size_ - 1; ) {
				time_ = withdrawalFee[i].time;
				fee_ = withdrawalFee[i + 1];
				if ((deltaTime_ > time_) && (deltaTime_ <= fee_.time)) {
					return fee_.rate;
				}
				unchecked {
					i++;
				}
			}
			return 0;
		}
	}

	/**
	 * @dev Update  asset's cap.
	 * @param asset_ asset's cap.
	 * @param cap_  asset's cap.
	 * Emits an {UpdateAssetCap} event indicating the updated asset's cap `cap_`.
	 */
	function updateAssetCap(
		address asset_,
		uint256 cap_
	) external onlyRole(MANAGER) {
		assetCap[asset_] = cap_;
		emit UpdateAssetCap(asset_, cap_);
	}

	/**
	 * @dev get deposit fee.
	 * @param amount_ deposit amount.
	 * @return fee_ deposit fee.
	 */
	function getDepositFee(uint256 amount_) public view returns (uint256 fee_) {
		DepositFee memory depositFee_ = depositFee;
		fee_ = Math.max(
			Math.mulDiv(depositFee_.rate, amount_, SCALING_FACTOR),
			depositFee_.minValue
		);
		fee_ = Math.min(fee_, depositFee_.maxValue);
	}

	/**
	 * @dev get token price.
	 */
	function getTokenPrice() public view returns (Price memory) {
		return tokenPrice;
	}

	/**
	 * @dev get withdrawal fee rate.
	 * @param holdTime_ hold time of the yield-bearing tokens.
	 * @return feeRate_ withdrawal fee rate.
	 */
	function getWithdrawalFeeRate(
		uint256 holdTime_
	) public view returns (uint256 feeRate_) {
		feeRate_ = calculateWithdrawalFeeRate(holdTime_);
	}

	/**
	 * @dev get withdrawal fee.
	 * @param index_ index of array withdrawal fee.
	 * @return fee_ withdrawal fee.
	 */
	function getWithdrawalFee(
		uint256 index_
	) public view returns (Fee memory fee_) {
		require(index_ < withdrawalFee.length, "Every.finance. out of size");
		fee_ = withdrawalFee[index_];
	}

	/**
	 * @dev get withdrawalFee size.
	 */

	function getWithdrawalFeeSize() public view returns (uint256) {
		return withdrawalFee.length;
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "../libraries/PendingRequest.sol";
import "../interfaces/IMetadata.sol";

/**
 * @dev Implementation of the investor's proof token {ERC721}.
 * We distinguish between deposit proof token and withdrawal proof token.
 * The investor receives the deposit/withdrawal proof token when he makes his deposit/withdrawal
 * request, waiting to be validated by the manager.
 */

contract Proof is ERC721Enumerable, Ownable, AccessControlEnumerable {
	using Strings for uint256;
	using PendingRequest for PendingRequestData;

	bytes32 public constant INVESTMENT = keccak256("INVESTMENT");
	uint256 public constant TOLERANCE_MAX = 1000; // To handel rounding errors
	uint256 public tolerance;
	uint8 public immutable id;
	bool public isOnChainMetadata;
	string public baseURI;
	address public investment;
	uint256 public totalAmount;
	mapping(uint256 => PendingRequestData) public pendingRequests;
	mapping(uint256 => uint256) public pendingIdIndex;
	mapping(address => uint256) public totalAmountPerAsset;
	uint256[] public pendingIds;
	IMetadata public metadata;

	event UpdateInvestment(address indexed investment_);
	event UpdateMetadata(address indexed metadata_);
	event UpdateBaseURI(string baseURI_);
	event UpdateTolerance(uint256 tolerance_);
	event UpdateIsOnChainMetadata(bool isOnChainMetadata_);
	event Mint(address indexed account_, uint256 tokenId_, uint256 amount_);
	event Burn(uint256 tokenId_);

	constructor(
		string memory name_,
		string memory symbol_,
		uint8 id_,
		address admin_
	) ERC721(name_, symbol_) {
		require(id_ <= 1, "Every.finance: out of range");
		require(admin_ != address(0), "Every.finance: zero address");
		id = id_;
		_setupRole(DEFAULT_ADMIN_ROLE, admin_);
	}

	/**
	 * @dev get the size of array pendingIds.
	 */
	function getPendingIdsSize() public view returns (uint256) {
		return pendingIds.length;
	}

	/**
	 * @dev Update investment.
	 * @param investment_.
	 * Emits an {UpdateInvestment} event indicating the updated investment `investment_`.
	 */
	function updateInvestment(
		address investment_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(investment_ != address(0), "Every.finance: zero address");
		require(investment_ != investment, "Every.finance: no change");
		_revokeRole(INVESTMENT, investment);
		_grantRole(INVESTMENT, investment_);
		investment = investment_;
		emit UpdateInvestment(investment_);
	}

	/**
	 * @dev Update metadata.
	 * @param metadata_.
	 * Emits an {UpdateMetadata} event indicating the updated metadata `metadata_`.
	 */
	function updateMetadata(
		address metadata_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(metadata_ != address(0), "Every.finance: zero address");
		require(metadata_ != address(metadata), "Every.finance: no change");
		metadata = IMetadata(metadata_);
		emit UpdateMetadata(metadata_);
	}

	/**
	 * @dev Update baseURI.
	 * @param uri_ new baseURI.
	 * Emits an {UpdateBaseURI} event indicating the updated baseURI `uri_`.
	 */
	function setBaseURI(
		string calldata uri_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		baseURI = uri_;
		emit UpdateBaseURI(uri_);
	}

	/**
	 * @dev Update tolerance.
	 * @param tolerance_.
	 * Emits an {UpdateTolerance} event indicating the updated tolerance `tolerance_`.
	 */
	function updateTolerance(
		uint256 tolerance_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(tolerance_ <= TOLERANCE_MAX, "Every.finance: tolerance max");
		require(tolerance_ != tolerance, "Every.finance: no change");
		tolerance = tolerance_;
		emit UpdateTolerance(tolerance_);
	}

	/**
	 * @dev Update isOnChainMetadata.
	 * @param isOnChainMetadata_.
	 * Emits an {UpdateIsOnChainMetadata} event indicating the updated isOnChainMetadata `isOnChainMetadata_`.
	 */
	function updateIsOnChainMetadata(
		bool isOnChainMetadata_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(
			isOnChainMetadata != isOnChainMetadata_,
			"Every.finance: no change"
		);
		isOnChainMetadata = isOnChainMetadata_;
		emit UpdateIsOnChainMetadata(isOnChainMetadata_);
	}

	/**
	 * @dev mint a Proof token.
	 * The investor receives a proof Token when he makes
	 * a deposit/withdrawal request.
	 * @param account_ investor's address.
	 * @param asset_ asset's address.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount to mint.
	 * @param minPrice_ minimum price of the yield-bearing token.
	 * @param maxPrice_ maximum price  of the yield-bearing token
	 * @param currentEventId_  id of the next manager event (process).
	 * Emits an {Mint} event with `account_`, `tokenId_`, and `amount`.
	 */
	function mint(
		address account_,
		address asset_,
		uint256 tokenId_,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 currentEventId_
	) external onlyRole(INVESTMENT) {
		_safeMint(account_, tokenId_);
		pendingIds.push(tokenId_);
		pendingIdIndex[tokenId_] = pendingIds.length - 1;
		_increasePendingRequest(
			tokenId_,
			amount_,
			minPrice_,
			maxPrice_,
			currentEventId_,
			asset_
		);
		pendingRequests[tokenId_].asset = asset_;
		emit Mint(account_, tokenId_, amount_);
	}

	/**
	 * @dev increase the pending request balance of token `tokenId_` by `amount`.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount to add.
	 * @param minPrice_ minimum price of the yield-bearing token.
	 * @param maxPrice_ maximum price  of the yield-bearing token
	 * @param currentEventId_  id of the next manager event (process).
	 * @param asset_ asset's address.
	 */

	function increasePendingRequest(
		uint256 tokenId_,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 currentEventId_,
		address asset_
	) external onlyRole(INVESTMENT) {
		_increasePendingRequest(
			tokenId_,
			amount_,
			minPrice_,
			maxPrice_,
			currentEventId_,
			asset_
		);
	}

	/**
	 * @dev decrease the pending request balance of token `tokenId_` by `amount`.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount to remove.
	 * @param currentEventId_  id of the next manager event (process).
	 * @param asset_ asset's address.
	 */
	function decreasePendingRequest(
		uint256 tokenId_,
		uint256 amount_,
		uint256 currentEventId_,
		address asset_
	) external onlyRole(INVESTMENT) {
		_decreasePendingRequest(tokenId_, amount_, currentEventId_, asset_);
	}

	/**
	 * @dev update event Id
	 * @param tokenId_  id of the token.
	 * @param currentEventId_  current event Id.
	 */
	function updateEventId(
		uint256 tokenId_,
		uint256 currentEventId_
	) external onlyRole(INVESTMENT) {
		pendingRequests[tokenId_].updateEventId(currentEventId_);
	}

	/**
	 * @dev update the locked and available pending balances before the manager validation.
	 * @param tokenId_  id of the token.
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function preValidatePendingRequest(
		uint256 tokenId_,
		uint256 currentEventId_
	) external onlyRole(INVESTMENT) {
		pendingRequests[tokenId_].preValidate(currentEventId_);
	}

	/**
	 * @dev update the locked pending balance after the manager validation.
	 * @param tokenId_  id of the token.
	 * @param amount_  amount to remove from the locked pending balance.
	 * @param currentEventId_  id of the next manager event (process).
	 * @param asset_ asset's address.
	 */
	function validatePendingRequest(
		uint256 tokenId_,
		uint256 amount_,
		uint256 currentEventId_,
		address asset_
	) external onlyRole(INVESTMENT) {
		pendingRequests[tokenId_].validate(amount_, currentEventId_);
		_decreasetotalAmountPerAsset(tokenId_, amount_, asset_);
	}

	/**
	 * @dev  get tokenURI of token `tokenId`.
	 * If `isOnChainMetadata`, the token metadata is generated on chain.
	 *  Otherwise, see {IERC721Metadata-tokenURI}.
	 * @param tokenId  token id .
	 */
	function tokenURI(
		uint256 tokenId
	) public view virtual override returns (string memory) {
		_requireMinted(tokenId);
		if (isOnChainMetadata) {
			return metadata.render(tokenId);
		} else {
			string memory string_ = _baseURI();
			return
				bytes(string_).length > 0
					? string(abi.encodePacked(string_, tokenId.toString()))
					: "";
		}
	}

	/**
	 * @dev See {IERC165-supportsInterface}.
	 */
	function supportsInterface(
		bytes4 interfaceId
	)
		public
		view
		override(ERC721Enumerable, AccessControlEnumerable)
		returns (bool)
	{
		return
			ERC721Enumerable.supportsInterface(interfaceId) ||
			AccessControlEnumerable.supportsInterface(interfaceId);
	}

	/**
	 * @dev increase the pending request balance of token `tokenId_` by `amount`.
	 * This internal function is called when an investor makes a deposit/withdrawal request.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount to add.
	 * @param minPrice_ minimum price of the yield-bearing token.
	 * @param maxPrice_ maximum price  of the yield-bearing token
	 * @param currentEventId_  id of the next manager event (process).
	 * @param asset_ asset's address.
	 */

	function _increasePendingRequest(
		uint256 tokenId_,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 currentEventId_,
		address asset_
	) internal {
		pendingRequests[tokenId_].increase(
			amount_,
			minPrice_,
			maxPrice_,
			currentEventId_
		);
		totalAmountPerAsset[asset_] += amount_;
		if (id == 0) {
			totalAmount += amount_;
		}
	}

	/**
	 * @dev decrease the pending request balance of token `tokenId_` by `amount`.
	 * This internal function is called when an investor cancel a deposit/withdrawal request.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount to remove.
	 * @param currentEventId_  id of the next manager event (process).
	 * @param asset_ asset's address.
	 */
	function _decreasePendingRequest(
		uint256 tokenId_,
		uint256 amount_,
		uint256 currentEventId_,
		address asset_
	) internal {
		pendingRequests[tokenId_].decrease(amount_, currentEventId_);
		_decreasetotalAmountPerAsset(tokenId_, amount_, asset_);
	}

	/**
	 * @dev burn token `tokenId_.
	 * a proof token is burned when its corresponding investor pending request is fully validated by the manager.
	 * @param tokenId_  id of the token.
	 * Emits a {Burn} event with `owner_` and `tokenId_ `.
	 */
	function burn(uint256 tokenId_) internal {
		_burn(tokenId_);
		_deleteId(tokenId_);
		emit Burn(tokenId_);
	}

	function _deleteId(uint256 id_) internal {
		uint256 index_ = pendingIdIndex[id_];
		uint256 lastId_ = pendingIds[pendingIds.length - 1];
		pendingIds[index_] = lastId_;
		pendingIds.pop();
		pendingIdIndex[lastId_] = index_;
		delete pendingIdIndex[id_];
		delete pendingRequests[id_];
	}

	/**
	 * @dev decrease totalAmountPerAsset at least by `amount`.
	 * This internal function decreases totalAmountPerAsset at least by `amount` when an investor cancels his
	 * deposit/withdrawal request `tokenId_` or the manager validates it.
	 * If the remaining pending request balance of `tokenId_` is lower than `tolerance`,
	 * the proof token `tokenId_` is burned and this remaining balance amount is removed also from totalAmountPerAsset.
	 * @param tokenId_  id of the token.
	 * @param amount_ amount of asset.
	 * @param asset_ asset's address.
	 */
	function _decreasetotalAmountPerAsset(
		uint256 tokenId_,
		uint256 amount_,
		address asset_
	) internal {
		uint256 amountToRemove_ = amount_;
		uint256 remainingAmount_ = pendingRequests[tokenId_].lockedAmount +
			pendingRequests[tokenId_].availableAmount;

		if (remainingAmount_ <= tolerance) {
			amountToRemove_ += remainingAmount_;
			burn(tokenId_);
		}
		require(
			totalAmountPerAsset[asset_] >= amountToRemove_,
			"Every.finance: max amount"
		);
		unchecked {
			totalAmountPerAsset[asset_] -= amountToRemove_;
		}

		if (id == 0) {
			unchecked {
				totalAmount -= amountToRemove_;
			}
		}
	}

	function _baseURI() internal view override returns (string memory) {
		return baseURI;
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "./HoldTime.sol";

/**
 * @dev Implementation of the yield-bearing tokens {ERC20}.
 */

contract Token is ERC20, AccessControlEnumerable {
	bytes32 public constant INVESTMENT = keccak256("INVESTMENT");
	address public investment;
	mapping(address => bool) public whitelist;
	HoldTime public holdTime;

	event UpdateInvestment(address indexed investment_);
	event UpdateHoldTime(address indexed holdTime_);
	event AddToWhiteList(address indexed address_);
	event RemoveFromWhiteList(address indexed address_);
	event Mint(address indexed to_, uint256 amount_);
	event Burn(address indexed account_, uint256 amount_);

	constructor(
		string memory _name,
		string memory _symbol,
		address holdTime_,
		address admin_
	) ERC20(_name, _symbol) {
		require(holdTime_ != address(0), "Every.finance: zero address");
		require(admin_ != address(0), "Every.finance: zero address");

		_setupRole(DEFAULT_ADMIN_ROLE, admin_);
		holdTime = HoldTime(holdTime_);
	}

	/**
	 * @dev Update investment.
	 * @param investment_.
	 * Emits an {UpdateInvestment} event indicating the updated investment `investment_`.
	 */
	function updateInvestment(
		address investment_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(investment_ != address(0), "Every.finance: zero address");
		require(investment_ != investment, "Every.finance: no change");
		_revokeRole(INVESTMENT, investment);
		_grantRole(INVESTMENT, investment_);
		whitelist[investment] = false;
		whitelist[investment_] = true;
		investment = investment_;
		emit UpdateInvestment(investment_);
	}

	/**
	 * @dev Update holdTime.
	 * @param holdTime_.
	 * Emits an {UpdateHoldTime} event indicating the updated holdTime `holdTime_`.
	 */
	function updateHoldTime(
		address holdTime_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(holdTime_ != address(0), "Every.finance: zero address");
		require(holdTime_ != address(holdTime), "Every.finance: no change");
		holdTime = HoldTime(holdTime_);
		emit UpdateHoldTime(holdTime_);
	}

	/**
	 * @dev Add `account_` to `whitelist `.
	 * @param account_ .
	 * Emits an {AddToWhiteList} event indicating the addedd address `account_`.
	 */
	function addToWhiteList(
		address account_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(account_ != address(0), "Every.finance: zero address");
		require(!whitelist[account_], "Every.finance: address exists");
		whitelist[account_] = true;
		emit AddToWhiteList(account_);
	}

	/**
	 * @dev remove `account_` from `whitelist `.
	 * @param account_ .
	 * Emits an {RemoveFromWhiteList} event indicating the deleted address `account_`.
	 */
	function removeFromWhiteList(
		address account_
	) external onlyRole(DEFAULT_ADMIN_ROLE) {
		require(whitelist[account_], "Every.finance: address doesn't exist");
		whitelist[account_] = false;
		emit RemoveFromWhiteList(account_);
	}

	/**
	 * @dev mint `amount_`Token for `to_`
	 * @param to_ receiver's address.
	 * @param amount_  amount to mint.
	 * Emits an {Mint} event with `to_`, and `amount_`.
	 */
	function mint(address to_, uint256 amount_) external onlyRole(INVESTMENT) {
		_mint(to_, amount_);
		emit Mint(to_, amount_);
	}

	/**
	 * @dev burn `amount_`Token for `from_`
	 * @param from_ user's address.
	 * @param amount_ amount to burn.
	 * Emits an {Burn} event with `from_`, and `amount_`.
	 */
	function burn(
		address from_,
		uint256 amount_
	) external onlyRole(INVESTMENT) {
		require(amount_ != 0, "Every.finance: zero amount");
		_burn(from_, amount_);
		emit Burn(from_, amount_);
	}

	/**
	 * @dev get the average token hold time of `account_`
	 * @param account_  user's address.
	 * @return time_ average token hold time.
	 */
	function getHoldTime(address account_) public view returns (uint256 time_) {
		time_ = holdTime.getHoldTime(account_);
	}

	/**
	 * @dev update the average token hold time for `account_`.
	 * @param account_ user's address.
	 * @param amount_  new received token amount.
	 */

	function _updateHoldTime(address account_, uint256 amount_) internal {
		require(amount_ != 0, "Every.finance: zero amount");
		holdTime.updateHoldTime(account_, amount_);
	}

	/**
	 * @dev Hook that is called before any transfer of tokens. This includes
	 * minting and burning. It permits to update the hold time of the receiver `to_` if :
	 *  - the receiver's address `from_` is not zero nor whitelisted  and the sender is not whitelisted
	 * @param from sender's address.
	 * @param to receiver's address.
	 * @param amount transferred amount.
	 */
	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual override {
		if ((to != address(0)) && (!whitelist[from]) && (!whitelist[to])) {
			_updateHoldTime(to, amount);
		}
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;
import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "../libraries/AssetTransfer.sol";

/**
 * @author Every.finance.
 * @notice Implementation of Treasury contract.
 */

contract Treasury is AccessControlEnumerable {
	bytes32 public constant WITHDRAWER = keccak256("WITHDRAWER");

	event SendTo(address indexed to_, uint256 amount_, address asset_);

	constructor(address admin_) payable {
		_setupRole(DEFAULT_ADMIN_ROLE, admin_);
	}

	receive() external payable {}

	/**
	 * @dev Send asset `asset_` from the contract to address `to_`.
	 * @param to_ receiver.
	 * @param amount_ amount to send.
	 * @param asset_ asset's address.
	 * Emits an {SendTo} event with `to_`, `amount_` and `asset_`.
	 */

	function sendTo(
		address to_,
		uint256 amount_,
		address asset_
	) public onlyRole(WITHDRAWER) {
		require(to_ != address(0), "Every.finance: zero address");
		AssetTransfer.transfer(to_, amount_, asset_);
		emit SendTo(to_, amount_, asset_);
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IMetadata {
	function render(uint256 _tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @dev Implementation of the library AssetTransfer that proposes functions to transfer Ether/ERC20 asset.
 */
library AssetTransfer {
	using SafeERC20 for IERC20;

	/**
	 * @dev transfer `amount_` of asset `asset_` from `from_` to `to_`.
	 * @param from_ sender'address.
	 * @param to_ receiver'address.
	 * @param amount_ amount to send.
	 * @param asset_ asset's IERC20 interface to send.Its decimal has to be lower than 18,
	 * if it is ERC20.
	 */
	function transferFrom(
		address from_,
		address to_,
		uint256 amount_,
		IERC20 asset_
	) internal {
		(bool success_, uint8 assetDecimals_) = tryGetAssetDecimals(asset_);
		require(success_, "Every.finance: no decimal");
		require(assetDecimals_ <= uint8(18), "Every.finance: max decimal");
		unchecked {
			assetDecimals_ = uint8(18) - assetDecimals_;
		}
		amount_ = amount_ / 10 ** assetDecimals_;
		require(amount_ != 0, "Every.finance: zero amount");
		asset_.safeTransferFrom(from_, to_, amount_);
	}

	/**
	 * @dev transfer `amount_` of asset `asset_` to `to_`.
	 * @param to_ receiver'address.
	 * @param amount_ amount to send.
	 * @param asset_ asset's address to send. Its decimal has to be lower than 18,
	 * if it is ERC20.
	 */
	function transfer(address to_, uint256 amount_, address asset_) internal {
		if (asset_ != address(0)) {
			(bool success_, uint8 assetDecimals_) = tryGetAssetDecimals(
				IERC20(asset_)
			);
			require(success_, "Every.finance: no decimal");
			assetDecimals_ = uint8(18) - assetDecimals_;
			amount_ = amount_ / 10 ** assetDecimals_;
			require(amount_ != 0, "Every.finance: zero amount");
			IERC20(asset_).safeTransfer(to_, amount_);
		} else {
			require(
				address(this).balance >= amount_,
				"Every.finance: amount exceeds balance"
			);
			payable(to_).transfer(amount_);
		}
	}

	/**
	 * @dev get asset's decimal.
	 * @param asset_ asset's IERC20 interface.
	 */
	function tryGetAssetDecimals(
		IERC20 asset_
	) internal view returns (bool, uint8) {
		(bool success, bytes memory encodedDecimals) = address(asset_)
			.staticcall(
				abi.encodeWithSelector(IERC20Metadata.decimals.selector)
			);
		if (success && encodedDecimals.length >= 32) {
			uint256 returnedDecimals = abi.decode(encodedDecimals, (uint256));
			if (returnedDecimals <= type(uint8).max) {
				return (true, uint8(returnedDecimals));
			}
		}
		return (false, 0);
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/utils/math/Math.sol";
import "./AssetTransfer.sol";
import "../common/Treasury.sol";
import "../common/Token.sol";

/**
 * @dev Implementation of the library FeeMinter that proposes functions to calculate and mint different fee.
 */

library FeeMinter {
	uint256 public constant SCALING_FACTOR_FEE = 1e8;
	uint256 public constant SCALING_FACTOR_PRICE = 1e18;
	uint256 public constant SECONDES_PER_YEAR = 365 days;

	/**
	 * @dev calculate and mint performance fee.
	 * performance fee is generated when the current price is above the average price.
	 * Performance fee is minted in yield-bearing token for the treasury.
	 * @param tokenPrice_ current price of the yield-bearing token.
	 * @param tokenPriceMean_ average price of the yield-bearing token.
	 * @param performanceFeeRate_ performance fee rate. Its precision factor is SCALING_FACTOR.
	 * @param treasury_ treasury
	 * @param token_  yield-bearing token's address.
	 */
	function mintPerformanceFee(
		uint256 tokenPrice_,
		uint256 tokenPriceMean_,
		uint256 performanceFeeRate_,
		address treasury_,
		address token_
	) internal returns (uint256, uint256) {
		Token tokenERC20_ = Token(token_);
		uint256 performanceFee_;
		if (tokenPrice_ > tokenPriceMean_) {
			uint256 deltaPrice_;
			unchecked {
				deltaPrice_ = tokenPrice_ - tokenPriceMean_;
				tokenPriceMean_ = tokenPrice_;
			}
			performanceFee_ = Math.mulDiv(
				tokenERC20_.totalSupply(),
				(deltaPrice_ * performanceFeeRate_),
				(tokenPrice_ * SCALING_FACTOR_FEE)
			);

			tokenERC20_.mint(treasury_, performanceFee_);
		}
		return (tokenPriceMean_, performanceFee_);
	}

	/**
	 * @dev calculate and mint management fee.
	 * management fee is minted in yield-bearing token for the treasury.
	 * @param managementFeeLastTime_  last time at wich the management fee is calculated.
	 * @param managementFeeRate_ management fee rate. Its precision factor is SCALING_FACTOR.
	 * @param treasury_ treasury
	 * @param token_  yield-bearing token's address.
	 */
	function mintManagementFee(
		uint256 managementFeeLastTime_,
		uint256 managementFeeRate_,
		address treasury_,
		address token_
	) internal returns (uint256, uint256) {
		uint256 managementFee_;
		if (managementFeeLastTime_ != 0) {
			Token tokenERC20_ = Token(token_);
			uint256 deltaTime_ = block.timestamp - managementFeeLastTime_;
			managementFee_ = Math.mulDiv(
				tokenERC20_.totalSupply(),
				(managementFeeRate_ * deltaTime_),
				(SCALING_FACTOR_FEE * SECONDES_PER_YEAR)
			);
			managementFeeLastTime_ = block.timestamp;
			tokenERC20_.mint(treasury_, managementFee_);
		}
		return (managementFeeLastTime_, managementFee_);
	}

	/**
	 * @dev calculate and mint investment fee (ie. slippage fee)
	 * investment fee is minted in yield-bearing token for the treasury.
	 * investment fee can be negative (cost: isFee == true) or positive (profit: isFee == false).
	 * if investment fee is negative, the manager can verify if he can get from the treasury the underlying  asset ,
	 * and mint for it the equivalent amount in yield-bearing token.
	 * if investment fee is positive, the manager can verify if he can send to the treasury the underlying  asset ,
	 * and burn form it the equivalent amount in yield-bearing token.
	 * @param amount_ amount of fee in yield-bearing token.
	 * @param tokenPrice_ current token price.
	 * @param isFee_ true if positive fee, false otherwise.
	 * @param treasury_ treasury
	 * @param token_  yield-bearing token's address.
	 * @param asset_  asset's address.
	 */
	function MintInvestmentFee(
		uint256 amount_,
		uint256 tokenPrice_,
		bool isFee_,
		address payable treasury_,
		address token_,
		address asset_
	) internal returns (uint256) {
		require(amount_ != 0, "Every.finance: zero amount");

		uint256 assetBalanceTreasury_ = _getBalance(asset_, treasury_);
		uint256 tokenBalanceTreasury_ = IERC20(token_).balanceOf(treasury_);

		if (isFee_) {
			return
				_mintNegativeInvestmentFee(
					amount_,
					assetBalanceTreasury_,
					tokenPrice_,
					treasury_,
					address(token_),
					asset_
				);
		} else {
			return
				_burnPositiveInvestmentFee(
					amount_,
					tokenBalanceTreasury_,
					tokenPrice_,
					treasury_,
					address(token_),
					asset_
				);
		}
	}

	/**
	 * @dev get asset's balance of the treasury.
	 * @param asset_  asset's addres.
	 * @param treasury_ treasury
	 */
	function _getBalance(
		address asset_,
		address treasury_
	) internal view returns (uint256 balance_) {
		if (asset_ == address(0)) {
			balance_ = treasury_.balance;
		} else {
			balance_ = IERC20(asset_).balanceOf(treasury_);

			(bool success_, uint8 assetDecimals_) = AssetTransfer
				.tryGetAssetDecimals(IERC20(asset_));
			require(success_, "Every.finance: no decimal");
			require(assetDecimals_ <= uint8(18), "Every.finance: max decimal");
			unchecked {
				assetDecimals_ = uint8(18) - assetDecimals_;
			}
			balance_ = balance_ * 10 ** assetDecimals_;
		}
	}

	/**
	 * @dev calculate and mint negative investment fee (ie. slippage fee)
	 * investment fee is minted in yield-bearing token for the treasury.
	 * the function verifies if it's possible to get from the treasury the underlying  asset ,
	 * and mint for it the equivalent amount in yield-bearing token.
	 * @param amount_ amount of fee in yield-bearing token.
	 * @param assetBalanceTreasury_ asset's balance of the treasury.
	 * @param tokenPrice_ current token price.
	 * @param treasury_ treasury
	 * @param token_ yield-bearing token's address.
	 * @param asset_ asset's address.
	 */
	function _mintNegativeInvestmentFee(
		uint256 amount_,
		uint256 assetBalanceTreasury_,
		uint256 tokenPrice_,
		address payable treasury_,
		address token_,
		address asset_
	) internal returns (uint256 remainingAmount_) {
		uint256 deltaAmount_ = Math.min(amount_, assetBalanceTreasury_);
		if (deltaAmount_ != 0) {
			Token tokenERC20_ = Token(token_);
			Treasury(treasury_).sendTo(address(this), deltaAmount_, asset_);
			uint256 tokenAmount_ = Math.mulDiv(
				deltaAmount_,
				SCALING_FACTOR_PRICE,
				tokenPrice_
			);
			tokenERC20_.mint(treasury_, tokenAmount_);
			unchecked {
				remainingAmount_ = amount_ - deltaAmount_;
			}
		} else {
			remainingAmount_ = amount_;
		}
	}

	/**
	 * @dev calculate and burn positive investment fee (ie. slippage fee)
	 * investment fee is burned in yield-bearing token from the treasury.
	 * the function verifies if it's possible to send to the treasury the underlying  asset ,
	 * and burn  from it the equivalent amount in yield-bearing token.
	 * @param amount_ amount of fee in yield-bearing token.
	 * @param tokenBalanceTreasury_ yield-bearing token's balance of the treasury.
	 * @param tokenPrice_ current token price.
	 * @param treasury_ treasury
	 * @param token_ yield-bearing token's address.
	 * @param asset_ asset's address.
	 */
	function _burnPositiveInvestmentFee(
		uint256 amount_,
		uint256 tokenBalanceTreasury_,
		uint256 tokenPrice_,
		address treasury_,
		address token_,
		address asset_
	) internal returns (uint256 remainingAmount_) {
		uint256 tokenAmount_ = Math.mulDiv(
			amount_,
			SCALING_FACTOR_PRICE,
			tokenPrice_
		);
		tokenAmount_ = Math.min(tokenAmount_, tokenBalanceTreasury_);
		uint256 deltaAmount_;
		if (tokenAmount_ != 0) {
			Token tokenERC20_ = Token(token_);
			deltaAmount_ = Math.mulDiv(
				tokenAmount_,
				tokenPrice_,
				SCALING_FACTOR_PRICE
			);
			AssetTransfer.transfer(treasury_, deltaAmount_, asset_);
			tokenERC20_.burn(treasury_, tokenAmount_);
		}
		unchecked {
			remainingAmount_ = amount_ - deltaAmount_;
		}
	}
}

// SPDX-License-Identifier: MIT
// Every.finance Contracts
pragma solidity ^0.8.4;

struct PendingRequestData {
	uint256 lockedAmount;
	uint256 availableAmount;
	uint256 minPrice;
	uint256 maxPrice;
	uint256 eventId;
	address asset;
}

/**
 * @dev Implementation of the library PendingRequest that proposes functions to update for an investor a struct PendingRequestData.
 */
library PendingRequest {
	/**
	 * @dev Modifier that checks if the new price bounds are valid.
	 * It reverts when introducing new price bounds during a manager event validation.
	 * It prevents the investor to modify the price bounds of his deposit/withdrawal request
	 * during a manager event validation.
	 */
	modifier CheckPrice(
		PendingRequestData storage request,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 currentEventId_
	) {
		if ((request.minPrice != 0) || (request.maxPrice != 0)) {
			if (currentEventId_ > request.eventId) {
				require(
					(minPrice_ == request.minPrice) &&
						(maxPrice_ == request.maxPrice),
					"Every.finance: price don't match"
				);
			}
		}
		_;
	}

	/**
	 * @dev Modifier that update for an investor his pending request data
	 * to be synchronized with the current event id.
	 */
	modifier syncWithEventId(
		PendingRequestData storage request,
		uint256 currentEventId_
	) {
		if (currentEventId_ > request.eventId) {
			request.lockedAmount += request.availableAmount;
			request.availableAmount = 0;
			request.eventId = currentEventId_;
		}
		_;
	}

	/**
	 * @dev increase a pending request `request` by `amount`.
	 * This function is called when an investor makes a deposit/withdrawal request.
	 * @param request  pending request.
	 * @param amount_ amount to add.
	 * @param minPrice_ minimum price of the yield-bearing token.
	 * @param maxPrice_ maximum price  of the yield-bearing token
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function increase(
		PendingRequestData storage request,
		uint256 amount_,
		uint256 minPrice_,
		uint256 maxPrice_,
		uint256 currentEventId_
	)
		internal
		CheckPrice(request, minPrice_, maxPrice_, currentEventId_)
		syncWithEventId(request, currentEventId_)
	{
		request.availableAmount += amount_;
		request.minPrice = minPrice_;
		request.maxPrice = maxPrice_;
	}

	/**
	 * @dev decrease a pending request `request` by `amount`.
	 * This function is called when an investor cancels a deposit/withdrawal request.
	 * @param request  pending request.
	 * @param amount_ amount to remove.
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function decrease(
		PendingRequestData storage request,
		uint256 amount_,
		uint256 currentEventId_
	) internal syncWithEventId(request, currentEventId_) {
		require(
			request.availableAmount >= amount_,
			"Every.finance: max amount"
		);
		unchecked {
			request.availableAmount -= amount_;
		}
	}

	/**
	 * @dev update event Id
	 *
	 * @param request pending request.
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function updateEventId(
		PendingRequestData storage request,
		uint256 currentEventId_
	) internal {
		request.eventId = currentEventId_;
	}

	/**
	 * @dev update the locked and available pending balances of `request` before the manager validation.
	 * @param request pending request.
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function preValidate(
		PendingRequestData storage request,
		uint256 currentEventId_
	) internal syncWithEventId(request, currentEventId_) {}

	/**
	 * @dev decrease the locked pending balance of `request` after the manager validation by `amount`.
	 * @param request pending request.
	 * @param currentEventId_  id of the next manager event (process).
	 */
	function validate(
		PendingRequestData storage request,
		uint256 amount_,
		uint256 currentEventId_
	) internal syncWithEventId(request, currentEventId_) {
		require(request.lockedAmount >= amount_, "Every.finance: max amount");
		unchecked {
			request.lockedAmount -= amount_;
		}
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import "../common/Investment.sol";

/**
 * @author Every.finance.
 * @notice Implementation of the contract InvestmentSigmaSOL.
 */

contract InvestmentSigmaSOL is Investment {
	constructor(
		address token_,
		address asset_,
		address management_,
		address deposit_,
		address withdrawal_,
		address admin_
	) Investment(token_, asset, management_, deposit_, withdrawal_, admin_) {}
}