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/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.15;

interface IERC20WrapperLocked {
    function withdrawToByLockTimestamps(address account, uint[] memory lockTimestamps, bool allowRemainderLoss) external returns (bool);

    function getLockedAmounts(address account) external view returns (uint[] memory  lock_timestamps, uint[] memory amounts);

    function getWithdrawAmountsByLockTimestamp(address account, uint lockTimestamp) external view returns (uint unlocked, uint locked);
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.15;

interface IEVault {
    function deposit(uint amount, address receiver) external returns (uint);
    
    function redeem(uint amount, address receiver, address owner) external returns (uint);

    function maxWithdraw(address owner) external view returns (uint);

    function maxRedeem(address owner) external view returns (uint);

    function maxDeposit(address account) external view returns (uint);

    function convertToAssets(uint shares) external view returns (uint);

    function convertToShares(uint assets) external view returns (uint);

    function asset() external view returns (address);

    function totalAssets() external view returns (uint);

    function totalSupply() external view returns (uint);

    function interestRate() external view returns (uint);

    function cash() external view returns (uint);

    function totalBorrows() external view returns (uint);

    function interestFee() external view returns (uint);
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.15;

interface IMerkleDistributor {
    function claim(address[] calldata users, address[] calldata tokens, uint256[] calldata amounts, bytes32[][] calldata proofs) external;

    function claimed(address user, address token) external view returns (uint208 amount, uint48 timestamp, bytes32 merkleRoot);
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.15;

import './PositionManagerHolder.sol';

/// @title PositionManager for EulerV2
/// @author IntoTheBlock Corp
contract PositionManager is PositionManagerHolder {
    event Deposit(address indexed caller, address token, address vault, uint amount, uint lpt_change);
    event Redeem(address indexed caller, address token, address vault, uint amount, uint lpt_change);
    event Assemble();
    event Disassemble();
    event ClaimLockedRewards(address indexed caller, address reward_token, uint[] lock_timestamps, uint[] amounts);

    /// @param _executors Executor addresses
    /// @param _wnative Wrapped native token address
    /// @param _vault vault address
    /// @param _merkle_distributor reward distributor address
    constructor(address[] memory _executors, address payable _wnative, address _underlying, address _vault, address _merkle_distributor) PositionManagerHolder(_executors, _wnative, _underlying, _vault, _merkle_distributor) {}

    modifier hasConfig() {
        require(position_config.vault != address(0), 'A3'); // position_config is missing
        _;
    }

    /// @param _underlying underlying address
    /// @param _vault vault address
    function updatePositionConfig(address _underlying, address _vault) public override onlyOwner {
        require(IEVault(_vault).asset() == _underlying);
        position_config = PositionConfig(_underlying, _vault);
        emit UpdatePositionConfig(msg.sender, _underlying, _vault);
    }

    /* Primitives */
    /// @notice Deposits the underlying token into the vault and returns the equivalent lpt_out
    /// @param _amount underlying token amount
    /// @param _min_lpt_out min lpt out
    /// @return lpt_out lpt out
    function deposit(uint _amount, uint _min_lpt_out) public onlyExecutor hasConfig returns (uint lpt_out) {
        PositionConfig memory c = position_config;
        lpt_out = IEVault(c.vault).deposit(_amount, address(this));
        require(lpt_out >= _min_lpt_out, 'D1'); // Insufficient lpt_out
        emit Deposit(msg.sender, c.underlying, c.vault, _amount, lpt_out);
    }

    /// @notice Deposits the entire balance of the underlying token into the vault and returns the equivalent lpt_out
    /// @param _min_lpt_out min lpt out
    /// @return lpt_out lpt out
    function assemble(uint _min_lpt_out) public virtual onlyExecutor hasConfig returns (uint lpt_out) {
        PositionConfig memory c = position_config;
        uint underlying_amount = _erc20Balance(c.underlying);
        lpt_out = deposit(underlying_amount, _min_lpt_out);
        emit Assemble();
    }

    /// @notice Redeems the specified lpt amount for the underlying token in the vault.
    /// @param _lpt_amount amount to redeem
    /// @param _min_out minimum amount of underlying token to receive
    /// @return amount_out amount of underlying token to receive
    function redeem(uint _lpt_amount, uint _min_out) public onlyExecutor hasConfig returns (uint amount_out) {
        PositionConfig memory c = position_config;
        amount_out = IEVault(c.vault).redeem(_lpt_amount, address(this), address(this));
        require(amount_out >= _min_out, 'R1'); // Insufficient amount_out
        emit Redeem(msg.sender, c.underlying, c.vault, amount_out, _lpt_amount);
    }

    /// @notice Redeems a percentage-based amount of lpt for the underlying token in the vault
    /// @param _percentage Percentage of the total position to redeem
    /// @param _min_out minimum amount of underlying token to receive
    /// @return amount_out amount of underlying token to receive
    function disassemble(uint _percentage, uint _min_out) public onlyExecutor hasConfig returns (uint amount_out) {
        require(_percentage <= ONE, 'P1');
        if (_percentage == 0)
            return 0;
        uint lpt_change = _percentageAmount(getLPTBalance(), _percentage);
        amount_out = redeem(lpt_change, _min_out);
        emit Disassemble();
    }

    /// @notice Redeems the entire position of lpt for the underlying token in the vault.
    /// @param _min_out minimum amount of underlying token to receive
    /// @return amount_out amount of underlying token to receive
    function fullDisassemble(uint _min_out) public onlyExecutor hasConfig returns (uint amount_out) {
        return disassemble(ONE, _min_out);
    }

    function claimLockedReward(address _reward_token, uint[] memory _lock_timestamps, bool _allow_remainder_loss) external onlyExecutor {
        uint[] memory reward_amounts = new uint[](_lock_timestamps.length);

        for (uint i = 0; i < _lock_timestamps.length; i++)
            (reward_amounts[i], ) = IERC20WrapperLocked(_reward_token).getWithdrawAmountsByLockTimestamp(address(this), _lock_timestamps[i]);

        IERC20WrapperLocked(_reward_token).withdrawToByLockTimestamps(address(this), _lock_timestamps, _allow_remainder_loss);

        emit ClaimLockedRewards(msg.sender, _reward_token, _lock_timestamps, reward_amounts);
    }

    /* View */
    function getPositionAssets() public view returns (address[] memory) {
        address[] memory assets = new address[](1);
        assets[0] = position_config.underlying;
        return assets;
    }

    function getLPTBalance() public view returns (uint) {
        return _erc20Balance(position_config.vault);
    }

    function getUnderlyings() external view returns (address[] memory assets, uint[] memory amounts) {
        address[] memory tokens = getPositionAssets();
        uint[] memory balances = new uint[](tokens.length);
        balances[0] = IEVault(position_config.vault).convertToAssets(getLPTBalance());
        return (tokens, balances);
    }
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.15;

import '@itb/quant-common/contracts/solidity8/ITBContract.sol';
import './interfaces/IEVault.sol';
import './interfaces/IMerkleDistributor.sol';
import './interfaces/IERC20WrapperLocked.sol';

struct MerkleClaimData {
    address[] users;
    address[] tokens;
    uint[] values;
    bytes32[][] proof;
}

/// @title PositionManager for Holding rewards and underlying
/// @author IntoTheBlock Corp
contract PositionManagerHolder is ITBContract {
    struct PositionConfig {
        address underlying;
        address vault;
    }

    PositionConfig public position_config;
    IMerkleDistributor public merkle_distributor;

    event UpdatePositionConfig(address indexed caller, address underlying, address vault);
    event UpdateMerkleDistributor(address indexed caller, address merkle_distributor);
    event ClaimMerkleRewards(address indexed caller, address[] tokens, uint[] values);

    /// @param _executors Executor addresses
    /// @param _wnative Wrapped native token address
    /// @param _underlying underlying address
    /// @param _vault vault address. Not used in Holder
    /// @param _merkle_distributor reward distributor address
    constructor(address[] memory _executors, address payable _wnative, address _underlying, address _vault, address _merkle_distributor) ITBContract(_executors, _wnative) {
        updatePositionConfig(_underlying, _vault);
        updateMerkleDistributor(_merkle_distributor);
    }

    /* Infra */
    function VERSION() external pure returns (string memory) {
        return '1.0.0';
    }

    /* Config */
    /// @param _merkle_distributor reward distributor address
    function updateMerkleDistributor(address _merkle_distributor) public onlyOwner {
        merkle_distributor = IMerkleDistributor(_merkle_distributor);
        emit UpdateMerkleDistributor(msg.sender, _merkle_distributor);
    }

    /// @param _underlying underlying address
    /// @param _vault vault address
    function updatePositionConfig(address _underlying, address _vault) public virtual onlyOwner {
        position_config = PositionConfig(_underlying, _vault);
        emit UpdatePositionConfig(msg.sender, _underlying, _vault);
    }

    /// @notice Claims the merkle rewards for the specified users
    /// @param _merkle_claim_data merkle claim data
    /// @return merkle_tokens_out tokens addresses claimed
    /// @return merkle_amounts_out amounts of tokens claimed
    function claimRewards(MerkleClaimData calldata _merkle_claim_data) external onlyExecutor returns (address[] memory merkle_tokens_out, uint[] memory merkle_amounts_out) {
        merkle_distributor.claim(_merkle_claim_data.users, _merkle_claim_data.tokens, _merkle_claim_data.values, _merkle_claim_data.proof);
        emit ClaimMerkleRewards(msg.sender, _merkle_claim_data.tokens, _merkle_claim_data.values);

        return (_merkle_claim_data.tokens, _merkle_claim_data.values);
    }
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.0;

import './PositionManager.sol';

contract YieldPosition is PositionManager {
    constructor(address[] memory _executors, address payable _wnative, address _underlying, address _vault, address _merkle_distributor) PositionManager(_executors, _wnative, _underlying, _vault, _merkle_distributor) {}

    function disassemble(uint _percentage, uint[] memory _min_outs) public onlyExecutor hasConfig returns (uint[] memory) {
        uint[] memory amounts_out = new uint[](1);
        amounts_out[0] = disassemble(_percentage, _min_outs[0]);
        return amounts_out;
    }
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.0;

import './YieldPosition.sol';
import '@itb/quant-common/contracts/solidity8/utils/Ownable2StepWithShortcut.sol';

contract YieldPositionOwnable2StepWithShortcut is YieldPosition, Ownable2StepWithShortcut {
    constructor(address[] memory _executors, address payable _wnative, address _underlying, address _vault, address _merkle_distributor) YieldPosition(_executors, _wnative, _underlying, _vault, _merkle_distributor) {}
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.20;

import './utils/Withdrawable.sol';
import './utils/IWETH.sol';


/// @title ITBContract contract that implements common owner only functions accros all strategies
/// @author IntoTheBlock Corp
/// @dev Abstract
abstract contract ITBContract is Withdrawable {
    using SafeERC20 for IERC20;
    event ApproveToken(address indexed token, address guy, uint256 wad);
    address payable immutable public WNATIVE;

    uint constant ONE = 1e18;

    /// @param _executors Executor addresses
    constructor(address[] memory _executors, address payable _wnative) Executable(_executors) {
        WNATIVE = _wnative;
    }

    function _percentageAmount(uint _amount, uint _percentage) internal pure returns (uint) {
        return _amount * _percentage / ONE;
    }

    /// @notice Set allowance for a given token, amount and spender
    /// @param _token Token to spend
    /// @param _guy Spender
    /// @param _wad Max amount to spend
    function _approveToken(address _token, address _guy, uint256 _wad) internal {
        if (_wad != 0)
            IERC20(_token).forceApprove(_guy, _wad);
        else
            IERC20(_token).approve(_guy, _wad);
        emit ApproveToken(_token, _guy, _wad);
    }

    /// @notice For a given token, amount and spender, check if contract can spend amount and, if necessary, set the allowance to amount
    /// @param _token Token to spend
    /// @param _guy Spender
    /// @param _amount Amount to spend
    function _checkAllowanceAndApprove(address _token, address _guy, uint256 _amount) internal {
        _checkAllowanceAndApprove(_token, _guy, _amount, _amount);
    }

    /// @notice For a given token, amount and spender, check if contract can spend amount and, if necessary, set the allowance to approval amount
    /// @param _token Token to spend
    /// @param _guy Spender
    /// @param _amount Amount to spend
    /// @param _approval_amount Amount to approve
    function _checkAllowanceAndApprove(address _token, address _guy, uint256 _amount, uint256 _approval_amount) internal {
        if (IERC20(_token).allowance(address(this), _guy) < _amount)
            _approveToken(_token, _guy, _approval_amount);
    }

    /// @notice Only owner. Set allowance for a given token, amount and spender
    /// @param _token Token to spend
    /// @param _guy Spender
    /// @param _wad Max amount to spend
    function approveToken(address _token, address _guy, uint256 _wad) external onlyOwner {
        _approveToken(_token, _guy, _wad);
    }

    /// @notice Only owner. Revoke allowance for a given token and spender
    /// @param _token Token to spend
    /// @param _guy Spender
    function revokeToken(address _token, address _guy) external onlyOwner {
        _approveToken(_token, _guy, 0);
    }

    /// @notice Only owner. Execute an arbitrary call
    /// @param _to Target address
    /// @param _value Value (i. e. msg.value)
    /// @param _data Invocation data
    function execute(address _to, uint256 _value, bytes calldata _data) external payable onlyOwner {
        (bool success, bytes memory returnData) = _to.call{ value: _value }(_data);
        require(success, string(returnData));
    }

    /// @notice Only owner. Execute multiple arbitrary calls in order
    /// @param _tos Target address for each call
    /// @param _values Value for each call (i. e. msg.value)
    /// @param _datas Invocation data for each call
    function batchExecute(address[] calldata _tos, uint256[] calldata _values, bytes[] calldata _datas) external payable onlyOwner {
        require(_tos.length == _values.length && _tos.length == _datas.length, "Arguments length mismatch");
        for (uint256 i = 0; i < _tos.length; i++) {
            (bool success, bytes memory returnData) = _tos[i].call{ value: _values[i] }(_datas[i]);
            require(success, string(returnData));
        }
    }

    function wrapNative(uint256 _amount) public onlyExecutor {
        IWETH(WNATIVE).deposit{ value: _amount }();
    }

    function unwrapNative(uint256 _amount) public onlyExecutor {
        IWETH(WNATIVE).withdraw(_amount);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable2Step.sol";

/// @title Base contract that implements executor related functions
/// @author IntoTheBlock Corp
/// @dev Abstract
abstract contract Executable is Ownable2Step {
    mapping(address => bool) public executors;

    event ExecutorUpdated(address indexed executor, bool enabled);

    /// @param _executors Initial whitelisted executor addresses
    constructor(address[] memory _executors) Ownable(msg.sender) {
        for (uint256 i = 0; i < _executors.length; i++) {
            addExecutor(_executors[i]);
        }
    }

    /// @notice Revert if call is not being made from the owner or an executor
    modifier onlyExecutor() {
        require(owner() == msg.sender || executors[msg.sender], "Executable: caller is not the executor");
        _;
    }

    /// @notice Only owner. Add an executor
    /// @param _executor New executor address
    function addExecutor(address _executor) public onlyOwner {
        emit ExecutorUpdated(_executor, true);
        executors[_executor] = true;
    }

    /// @notice Only owner. Remove an executor
    /// @param _executor Executor address to remove
    function removeExecutor(address _executor) external onlyOwner {
        emit ExecutorUpdated(_executor, false);
        executors[_executor] = false;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

interface IWETH {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);

    event Approval(address indexed src, address indexed guy, uint256 wad);
    event Transfer(address indexed src, address indexed dst, uint256 wad);
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);

    function balanceOf(address) external view returns (uint256);
    function allowance(address, address) external view returns (uint256);

    fallback() external payable;
    receive() external payable;
    function deposit() external payable;
    function withdraw(uint256 wad) external;
    function totalSupply() external view returns (uint256);
    function approve(address guy, uint256 wad) external returns (bool);
    function transfer(address dst, uint256 wad) external returns (bool);
    function transferFrom(address src, address dst, uint256 wad) external returns (bool);
}

/* SPDX-License-Identifier: UNLICENSED */
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable2Step.sol";

abstract contract Ownable2StepWithShortcut is Ownable2Step {
    function transferOwnership1Step(address newOwner) public onlyOwner {
        require(newOwner != address(0), "ITBOwnable: zero address");
        _transferOwnership(newOwner);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import './Executable.sol';

/**
    Ensures that any contract that inherits from this contract is able to
    withdraw funds that are accidentally received or stuck.
 */

/// @title Base contract that implements withdrawal related functions
/// @author IntoTheBlock Corp
/// @dev Abstract
abstract contract Withdrawable is Executable {
    using SafeERC20 for IERC20;
    address constant ETHER = address(0);

    event LogWithdraw(
        address indexed _to,
        address indexed _asset_address,
        uint256 amount
    );

    receive() external payable {}

    
    /// @notice ERC20 or ETH balance of this contract given a token address
    /// @param _asset_address Token address or address(0) for ETH
    /// @return Balance    
    function _erc20OrNativeBalance(address _asset_address) internal view returns (uint256) {
        return _asset_address == ETHER ? _nativeBalance() : _erc20Balance(_asset_address);
    }
    
    function _erc20Balance(address _asset_address) internal view returns (uint256) {
        return IERC20(_asset_address).balanceOf(address(this));
    }

    function _nativeBalance() internal view returns (uint256) {
        return address(this).balance;
    }
    
    /// @notice ERC20 balance of given account
    /// @param _asset_address Token address 
    /// @param _account Account address 
    /// @return Balance  
    function balanceOf(address _asset_address, address _account) public view returns (uint256) {
        return IERC20(_asset_address).balanceOf(_account);
    }

    /// @notice Send the given amount of the given token or ETH to the given receiver
    /// @param _asset_address Token address or address(0) for ETH
    /// @param _amount Amount to send
    /// @param _to Receiver address
    function _withdraw_to(address _asset_address, uint256 _amount, address payable _to) internal {
        require(_to != address(0), 'Invalid address');
        uint256 balance = _erc20OrNativeBalance(_asset_address);
        require(balance >= _amount, 'Insufficient funds');
        if (_asset_address == ETHER) {
            (bool success, ) = _to.call{value: _amount}(''); /* carry gas over so it works with contracts with custom fallback, we dont care about reentrancy on onlyOwner */
            require(success, 'Native transfer failed.');
        } else
            IERC20(_asset_address).safeTransfer(_to, _amount);
        emit LogWithdraw(_to, _asset_address, _amount);
    }

    /// @notice Only owner. Send the given amount of the given token or ETH to the caller
    /// @param _asset_address Token address or address(0) for ETH
    /// @param _amount Amount to send
    function withdraw(address _asset_address, uint256 _amount) external onlyOwner {
        _withdraw_to(_asset_address, _amount, payable(msg.sender));
    }

    /// @notice Only owner. Send the given amount of the given token or ETH to the given receiver
    /// @param _asset_address Token address or address(0) for ETH
    /// @param _amount Amount to send
    /// @param _to Receiver address
    function withdrawTo(address _asset_address, uint256 _amount, address payable _to) external onlyOwner {
        _withdraw_to(_asset_address, _amount, _to);
    }

    /// @notice Only owner. Send its entire balance of the given token or ETH to the caller
    /// @param _asset_address Token address or address(0) for ETH
    function withdrawAll(address _asset_address) external onlyOwner {
        uint256 balance = _erc20OrNativeBalance(_asset_address);
        _withdraw_to(_asset_address, balance, payable(msg.sender));
    }

    /// @notice Only owner. Send its entire balance of the given token or ETH to the given receiver
    /// @param _asset_address Token address or address(0) for ETH
    /// @param _to Receiver address
    function withdrawAllTo(address _asset_address, address payable _to) external onlyOwner {
        uint256 balance = _erc20OrNativeBalance(_asset_address);
        _withdraw_to(_asset_address, balance, _to);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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 v5.1.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This extension of the {Ownable} contract includes a two-step mechanism to transfer
 * ownership, where the new owner must call {acceptOwnership} in order to replace the
 * old one. This can help prevent common mistakes, such as transfers of ownership to
 * incorrect accounts, or to contracts that are unable to interact with the
 * permission system.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     *
     * Setting `newOwner` to the zero address is allowed; this can be used to cancel an initiated ownership transfer.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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 (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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);
}