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//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.21;

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

contract Swapper {
    bool public paused;

    address public constant TST = 0x25717b2fa0BEc614A44Ac132B85BA0EaeeaDaE01;
    address public constant CREPE = 0x5516d551Af482B4eef4B909138d5e48e05a7f50a;
    address public constant CRE = 0xe81432473290F4ffCFc5E823F8069Db83e8A677B;

    // TST 또는 CREPE 토큰 스왑을 시작할 시간, 2023년 10월 1일 오전 9시(GMT+9)
    uint256 public constant START = 1696118400;
    // Governance 컨트랙트 주소
    address public gov;
    // TST 코인을 받을 지갑 주소
    address public immutable receiver;
    // 스왑된 TST / CREPE 토큰 수량
    mapping(address => uint256) public _swapped;

    event Swap(
        address indexed account,
        address indexed token,
        uint256 indexed amount
    );

    /// @param _receiver 스왑에 사용된 TST 토큰을 수령할 지갑 주소
    constructor(address _gov, address _receiver) {
        gov = _gov;
        receiver = _receiver;
    }

    modifier notPaused() {
        require(!paused, "Swapper: paused");
        _;
    }

    modifier onlyGov() {
        require(msg.sender == gov, "Swapper: only gov");
        _;
    }

    function setGov(address _gov) external onlyGov {
        gov = _gov;
    }

    function pause() external onlyGov {
        paused = !paused;
    }

    function deposit(uint256 amount) external onlyGov {
        IERC20(CRE).transferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount) external onlyGov {
        require(
            IERC20(CRE).balanceOf(address(this)) >= amount,
            "Swapper: not enough balance"
        );

        IERC20(CRE).transfer(msg.sender, amount);
    }

    /// @notice TST 또는 CREPE 토큰을 CRE 토큰을 1:1로 교환하는 함수
    /// @param token swap 할 토큰 주소, TST 또는 CREPE만 가능
    /// @param amount swap 할 토큰 수량
    function swap(address token, uint256 amount) external notPaused {
        require(START <= block.timestamp, "Swapper: not started yet");
        require(token == CREPE || token == TST, "Swapper: unsupported token");

        unchecked {
            _swapped[token] += amount;
        }

        // CREPE 토큰은 소각하고, TST 토큰은 지정된 지갑으로 전송
        if (token == CREPE) {
            IERC20(token).transferFrom(
                msg.sender,
                0x000000000000000000000000000000000000dEaD,
                amount
            );
            IERC20(CRE).transfer(msg.sender, amount);
        } else {
            IERC20(token).transferFrom(msg.sender, receiver, amount);
            // TST 코인은 decimals가 6이므로 1e12를 곱해서 전송
            IERC20(CRE).transfer(msg.sender, amount * 1e12);
        }

        emit Swap(msg.sender, token, amount);
    }

    /// @notice 스왑된 TST / CREPE 토큰 수량 조회
    function stats() external view returns (uint256, uint256) {
        return (_swapped[TST], _swapped[CREPE]);
    }
}

// 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);
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000001337ef3cf8aebbac95b8e3b496cfcbb489cd72cc000000000000000000000000731bcca18b3527aa212c06de9e2fb6bd6db370de

-----Decoded View---------------
Arg [0] : _gov (address): 0x1337ef3cF8aEbBAc95b8E3b496CfCBB489cd72cC
Arg [1] : _receiver (address): 0x731BCca18b3527aa212c06dE9e2fB6Bd6DB370DE

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000001337ef3cf8aebbac95b8e3b496cfcbb489cd72cc
Arg [1] : 000000000000000000000000731bcca18b3527aa212c06de9e2fb6bd6db370de