Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.27;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
// OZ v5 location:
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract TokenPresaleUSDT is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    // --- State Variables ---
    IERC20 public immutable gentestToken;     // GENtest token sold in presale (18 decimals)
    IERC20 public immutable usdtToken;        // USDT used to buy GENtest (6 decimals)
    address public presaleWallet;

    uint256 public tokenPrice;          // price of 1 GENtest in USDT (6 decimals)
    uint256 public hardcap;             // maximum USDT to raise (6 decimals)
    uint256 public presaleAllocation;   // GENtest tokens allocated for presale (18 decimals)
    uint256 public startTime;           // presale start timestamp
    bool public isFinalized;            // true if presale finalized
    uint256 public finalizedTime;
    uint256 public minPurchase;         // minimum USDT purchase (6 decimals)

    uint256 public fundsRaised;         // total USDT raised (6 decimals)
    uint256 public tokensSold;          // total GENtest sold (18 decimals)

    mapping(address => uint256) public contributions; // USDT spent by buyer
    mapping(address => uint256) public tokensOwed;    // GENtest owed to buyer

    // --- ADDED State ---
    uint256 public gentestDeposited;                 // amount of GENtest deposited via fundPresale
    uint256 public constant CLAIM_DELAY = 24 hours;  // claim delay after finalize

    // --- Events ---
    event PresaleDeployed(
        address indexed gentestToken,
        address indexed usdtToken,
        uint256 tokenPrice,
        uint256 hardcap,
        uint256 presaleAllocation,
        uint256 startTime
    );
    event TokensPurchased(
        address indexed buyer,
        uint256 usdtAmount,
        uint256 gentestAmount,
        uint256 totalUSDTRaised,
        uint256 totalGENtestSold
    );
    event TokensClaimed(address indexed claimer, uint256 amount);
    event FundsWithdrawn(address indexed wallet, uint256 amount);
    event PresaleFinalized(bool success, uint256 totalTokensSold, uint256 totalUSDTRaised);
    event HardcapReached(uint256 hardcap);
    event AllTokensSold(uint256 totalTokensSold);

    // --- ADDED Event ---
    event PresaleFunded(address indexed from, uint256 amount);

    // --- Errors ---
    error PresaleNotActive();
    error AlreadyFinalized();
    error ZeroAddress();
    error ZeroAmount();
    error PresaleEnded(uint256 tokensSold, uint256 presaleAllocation);
    error HardcapExceeded(uint256 hardcap, uint256 requested, uint256 current);
    error InsufficientGENtest(uint256 available, uint256 requested);
    error InsufficientBalance(uint256 requested, uint256 available);
    error WithdrawFailed();
    error ClaimNotAllowedYet();
    error NoTokensToClaim();
    error PurchaseTooSmall(uint256 minPurchase);
    error CannotFinalizeBeforeConditions();
    error InvalidGENtestDecimals(uint8 expected, uint8 actual);
    error InvalidUSDTDecimals(uint8 expected, uint8 actual);

    // --- ADDED Errors ---
    error NotFinalized();
    error ClaimTooEarly(uint256 earliestTime);

    // --- Constructor ---
    constructor(
        address _gentestTokenAddress,
        address _usdtTokenAddress,
        address _presaleWallet,
        uint256 _tokenPrice,
        uint256 _hardcap,
        uint256 _presaleAllocation,
        uint256 _startTime,
        uint256 _minPurchase
    ) Ownable(msg.sender) {
        if (_gentestTokenAddress == address(0)) revert ZeroAddress();
        if (_usdtTokenAddress == address(0)) revert ZeroAddress();
        if (_presaleWallet == address(0)) revert ZeroAddress();
        if (_startTime <= block.timestamp) revert PresaleNotActive();
        if (_tokenPrice == 0) revert ZeroAmount();
        if (_hardcap == 0) revert ZeroAmount();
        if (_presaleAllocation == 0) revert ZeroAmount();
        if (_minPurchase == 0) revert ZeroAmount();

        gentestToken = IERC20(_gentestTokenAddress);
        usdtToken = IERC20(_usdtTokenAddress);

        // Check GENtest decimals = 18
        uint8 genDecimals = IERC20Metadata(_gentestTokenAddress).decimals();
        if (genDecimals != 18) revert InvalidGENtestDecimals(18, genDecimals);

        // Check USDT decimals = 6
        uint8 usdtDecimals = IERC20Metadata(_usdtTokenAddress).decimals();
        if (usdtDecimals != 6) revert InvalidUSDTDecimals(6, usdtDecimals);

        presaleWallet = _presaleWallet;
        tokenPrice = _tokenPrice;
        hardcap = _hardcap;
        presaleAllocation = _presaleAllocation;
        startTime = _startTime;
        minPurchase = _minPurchase;

        emit PresaleDeployed(
            _gentestTokenAddress,
            _usdtTokenAddress,
            _tokenPrice,
            _hardcap,
            _presaleAllocation,
            _startTime
        );
    }

    // --- Owner funds presale by transferring GENtest from owner to this contract ---
    /// @notice Owner deposits GENtest into the presale contract. Owner must approve the presale contract first.
    function fundPresale(uint256 amount) external onlyOwner nonReentrant {
        if (amount == 0) revert ZeroAmount();
        if (isFinalized) revert AlreadyFinalized(); // disallow funding after finalize
        gentestToken.safeTransferFrom(msg.sender, address(this), amount);
        gentestDeposited += amount;
        emit PresaleFunded(msg.sender, amount);
    }

    // --- Helpers ---
    function divRoundUp(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        return (a - 1) / b + 1;
    }

    function _min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    function _gentestForUSDTFloor(uint256 availableUSDT) internal view returns (uint256) {
        // Calculate GENtest amount from USDT (6 decimals) and tokenPrice (6 decimals)
        // GENtest has 18 decimals, so scale by 1e18
        return (availableUSDT * 1e18) / tokenPrice;
    }

    // --- Core Functions ---
    function buyTokensWithUSDT(uint256 usdtAmount) external nonReentrant {
        if (block.timestamp < startTime) revert PresaleNotActive();
        if (isFinalized) revert AlreadyFinalized();
        if (usdtAmount == 0) revert ZeroAmount();

        uint256 gentestDesired = divRoundUp(usdtAmount * 1e18, tokenPrice);
        if (gentestDesired == 0) revert ZeroAmount();

        uint256 availableGENtest = presaleAllocation - tokensSold;
        if (availableGENtest == 0) revert PresaleEnded(tokensSold, presaleAllocation);

        uint256 remainingUSDTCap = hardcap > fundsRaised ? hardcap - fundsRaised : 0;
        if (remainingUSDTCap == 0) revert HardcapExceeded(hardcap, usdtAmount, fundsRaised);

        uint256 gentestByHardcap = _gentestForUSDTFloor(remainingUSDTCap);
        if (gentestByHardcap == 0) revert HardcapExceeded(hardcap, usdtAmount, fundsRaised);

        uint256 effectiveAvailable = _min(availableGENtest, gentestByHardcap);

        // Partial fill logic
        bool partialFill = gentestDesired > effectiveAvailable;
        uint256 gentestToSell = partialFill ? effectiveAvailable : gentestDesired;
        uint256 usdtRequired = (gentestToSell * tokenPrice) / 1e18;

        if (!partialFill && usdtRequired < minPurchase) revert PurchaseTooSmall(minPurchase);

        contributions[msg.sender] += usdtRequired;
        fundsRaised += usdtRequired;
        tokensSold += gentestToSell;
        tokensOwed[msg.sender] += gentestToSell;

        usdtToken.safeTransferFrom(msg.sender, address(this), usdtRequired);

        emit TokensPurchased(msg.sender, usdtRequired, gentestToSell, fundsRaised, tokensSold);

        if (fundsRaised >= hardcap) emit HardcapReached(hardcap);
        if (tokensSold >= presaleAllocation) {
            isFinalized = true;
            finalizedTime = block.timestamp;
            emit AllTokensSold(tokensSold);
            emit PresaleFinalized(true, tokensSold, fundsRaised);
        }
    }

    function buyExactTokens(uint256 gentestAmount) external nonReentrant {
        if (block.timestamp < startTime) revert PresaleNotActive();
        if (isFinalized) revert AlreadyFinalized();
        if (gentestAmount == 0) revert ZeroAmount();

        uint256 availableGENtest = presaleAllocation - tokensSold;
        if (availableGENtest == 0) revert PresaleEnded(tokensSold, presaleAllocation);

        uint256 remainingUSDTCap = hardcap > fundsRaised ? hardcap - fundsRaised : 0;
        if (remainingUSDTCap == 0) revert HardcapExceeded(hardcap, 0, fundsRaised);

        uint256 gentestByHardcap = _gentestForUSDTFloor(remainingUSDTCap);
        if (gentestByHardcap == 0) revert HardcapExceeded(hardcap, 0, fundsRaised);

        uint256 effectiveAvailable = _min(availableGENtest, gentestByHardcap);

        bool partialFill = gentestAmount > effectiveAvailable;
        uint256 gentestToSell = partialFill ? effectiveAvailable : gentestAmount;
        uint256 usdtRequired = (gentestToSell * tokenPrice) / 1e18;

        if (!partialFill && usdtRequired < minPurchase) revert PurchaseTooSmall(minPurchase);

        contributions[msg.sender] += usdtRequired;
        fundsRaised += usdtRequired;
        tokensSold += gentestToSell;
        tokensOwed[msg.sender] += gentestToSell;

        usdtToken.safeTransferFrom(msg.sender, address(this), usdtRequired);

        emit TokensPurchased(msg.sender, usdtRequired, gentestToSell, fundsRaised, tokensSold);

        if (fundsRaised >= hardcap) emit HardcapReached(hardcap);
        if (tokensSold >= presaleAllocation) {
            isFinalized = true;
            finalizedTime = block.timestamp;
            emit AllTokensSold(tokensSold);
            emit PresaleFinalized(true, tokensSold, fundsRaised);
        }
    }

    function claimTokens() external nonReentrant {
        if (!isFinalized) revert NotFinalized();
        uint256 earliest = finalizedTime + CLAIM_DELAY;
        if (block.timestamp < earliest) revert ClaimTooEarly(earliest);

        uint256 amount = tokensOwed[msg.sender];
        if (amount == 0) revert NoTokensToClaim();

        uint256 availableGENtestInContract = gentestToken.balanceOf(address(this));
        if (availableGENtestInContract < amount) revert InsufficientGENtest(availableGENtestInContract, amount);

        tokensOwed[msg.sender] = 0;
        gentestToken.safeTransfer(msg.sender, amount);

        emit TokensClaimed(msg.sender, amount);
    }

    function withdrawUSDT(address _to, uint256 _amount) external nonReentrant onlyOwner {
        if (_amount == 0) revert ZeroAmount();
        if (_to == address(0)) revert ZeroAddress();

        uint256 contractBalance = usdtToken.balanceOf(address(this));
        if (contractBalance < _amount) revert InsufficientBalance(_amount, contractBalance);

        usdtToken.safeTransfer(_to, _amount);
        emit FundsWithdrawn(_to, _amount);
    }

    function finalize() external nonReentrant onlyOwner {
        if (isFinalized) revert AlreadyFinalized();
        if (!(fundsRaised >= hardcap || tokensSold >= presaleAllocation)) {
            revert CannotFinalizeBeforeConditions();
        }

        uint256 availableGENtestInContract = gentestToken.balanceOf(address(this));
        if (availableGENtestInContract < tokensSold) revert InsufficientGENtest(availableGENtestInContract, tokensSold);

        isFinalized = true;
        finalizedTime = block.timestamp;
        emit PresaleFinalized(true, tokensSold, fundsRaised);
    }

    // --- View Functions ---
    function isActive() public view returns (bool) {
        return block.timestamp >= startTime &&
            !isFinalized &&
            tokensSold < presaleAllocation &&
            fundsRaised < hardcap;
    }

    function remainingGENtest() public view returns (uint256) {
        return presaleAllocation - tokensSold;
    }

    function remainingUSDTCapacity() public view returns (uint256) {
        if (!isActive()) return 0;
        uint256 maxByHardcap = hardcap - fundsRaised;
        uint256 maxByGENtest = (presaleAllocation - tokensSold) * tokenPrice / 1e18;
        return maxByHardcap < maxByGENtest ? maxByHardcap : maxByGENtest;
    }

    function usdtRaised() public view returns (uint256) {
        return fundsRaised;
    }

    function gentestSold() public view returns (uint256) {
        return tokensSold;
    }

    function getUserContribution(address user) public view returns (uint256) {
        return contributions[user];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

// 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 v5.3.0) (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 v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

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

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
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 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 v5.4.0) (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 v5.0.1) (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) (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) (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);
}