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

import {IERC20} from "openzeppelin/token/ERC20/IERC20.sol";
import {IERC20Metadata} from "openzeppelin/token/ERC20/extensions/IERC20Metadata.sol";

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

contract Presale {
    address public constant CRE = 0xe81432473290F4ffCFc5E823F8069Db83e8A677B;

    address public gov;

    bool public paused;

    // CRE price(deicmals: 8)
    uint256 public crePrice;

    // 각 스테이블 코인의 체인링크 heartbeat 주기
    mapping(address => uint256) heartbeats;
    // 스테이블 코인의 체인링크 오라클 주소
    mapping(address => address) priceOracles;

    constructor(address _gov) {
        gov = _gov;
    }

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

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

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

    /// @notice CRE로 교환할 수 있는 스테이블 코인 추가
    /// @param token 스테이블 코인 주소
    /// @param oracle 스테이블 코인의 체인링크 오라클 주소
    /// @param heartbeat 체인링크 heartbeat 주기, 오래된 가격 정보를 사용하지 않기 위함
    function addStable(
        address token,
        address oracle,
        uint256 heartbeat
    ) external onlyGov {
        heartbeats[token] = heartbeat;
        priceOracles[token] = oracle;
    }

    /// @notice CRE로 교환할 수 있는 스테이블 코인 제거
    /// @param token 스테이블 코인 주소
    function removeStable(address token) external onlyGov {
        priceOracles[token] = address(0);
    }

    function setCREPrice(uint256 price) external onlyGov {
        crePrice = price;
    }

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

    function withdraw(
        address token,
        address to,
        uint256 amount
    ) external onlyGov {
        require(
            amount <= IERC20(token).balanceOf(address(this)),
            "Presale: insufficient balance"
        );

        IERC20(token).transfer(to, amount);
    }

    function getPrice(address token) private view returns (uint256) {
        address priceOracle = priceOracles[token];
        require(priceOracle != address(0), "Presale: unknown token");

        (, int256 price, , uint256 updatedAt, ) = IPriceOracle(priceOracle)
            .latestRoundData();
        require(
            updatedAt > (block.timestamp - heartbeats[token]),
            "Presale: price error"
        );

        return uint256(price);
    }

    function exchangeRate(address stable) public view returns (uint256) {
        // 스테이블 코인 가격 확인(decimal: 8)
        uint256 stablePrice = getPrice(stable);

        // 스테이블 코인 1개당 받을 수 있는 CRE 토큰 수량 계산
        // stablePrice과 crePrice의 deicmals가 8이므로 CRE 토큰의 decimals 값인 18로 맞추기 위해 1e10 추가해서 곱함
        return (stablePrice * 1e18) / crePrice;
    }

    /// @notice 스테이블 코인으로 CRE 토큰을 구매하는 기능
    /// @param stable 스테이블 코인 주소
    /// @param stableAmount CRE 토큰 구매에 사용할 스테이블 코인 수량
    function buy(address stable, uint256 stableAmount) external {
        require(!paused, "Presale: paused");

        // 스테이블 코인 1개당 받을 수 있는 CRE 토큰 수량 계산
        // stablePrice과 crePrice의 deicmals가 8이므로 CRE 토큰의 decimals 값인 18로 맞추기 위해 1e10 추가해서 곱함
        uint256 stablePerCRE = exchangeRate(stable);

        // 전송할 CRE 토큰 수량 계산
        uint256 stableDecimals = IERC20Metadata(stable).decimals();
        uint256 amount = (stableAmount * stablePerCRE) / (10 ** stableDecimals);

        require(
            IERC20(CRE).balanceOf(address(this)) >= amount,
            "Presale: insufficient balance"
        );
        IERC20(CRE).transfer(msg.sender, amount);

        IERC20(stable).transferFrom(msg.sender, address(this), stableAmount);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "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": {}
}

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[{"inputs":[{"internalType":"address","name":"_gov","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CRE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"oracle","type":"address"},{"internalType":"uint256","name":"heartbeat","type":"uint256"}],"name":"addStable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"stable","type":"address"},{"internalType":"uint256","name":"stableAmount","type":"uint256"}],"name":"buy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"crePrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"stable","type":"address"}],"name":"exchangeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gov","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"removeStable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"name":"setCREPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_gov","type":"address"}],"name":"setGov","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000001337ef3cf8aebbac95b8e3b496cfcbb489cd72cc

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

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