// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }


    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }


    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }


    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }


    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }


    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }


    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }


    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
interface nft{
  function ownerOf(uint256 tokenId) external view returns (address owner);
  function isApprovedForAll(address owner, address operator) external view returns (bool);
  function safeTransferFrom(address from, address to, uint256 tokenId) external;
}

interface IERC20 {

    function transfer(address recipient, uint256 amount) external returns (bool);
    
}

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

contract exchange is IERC721Receiver,Ownable{
    using SafeMath for uint256;
    
    event Change(uint256[] tokenIds,address user,uint256 amount);
    
    address public nftAddress;
    address public tokenAddress;
    uint256 public quantity = 59488e18;
    bool public state = false;
    uint256 public lockTime;
    constructor(address nft_address,address token_address) Ownable(){
        nftAddress = nft_address;
        tokenAddress = token_address;
        lockTime = 3600*24*365 + block.timestamp;
    }
    
    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }

    function change(uint256[] memory tokenIds) public{
        require(state == true, "not yet open");
        require(nft(nftAddress).isApprovedForAll(msg.sender, address(this)) == true, "transfer caller is not approved");
        for(uint256 i = 0; i < tokenIds.length;i++){
            require(nft(nftAddress).ownerOf(tokenIds[i]) == msg.sender, "transfer caller is not owner");
            nft(nftAddress).safeTransferFrom(msg.sender,0x000000000000000000000000000000000000dEaD,tokenIds[i]);
        }
        uint256 amount = quantity.mul(tokenIds.length);
        IERC20(tokenAddress).transfer(msg.sender,amount);
        emit Change(tokenIds,msg.sender,amount);
    }

    function setQuantity(uint256 amount) public onlyOwner{
        quantity = amount;
    }
    function setState(bool _state) public onlyOwner{
        state = _state;
    }

    function withdraw(uint256 amount) public onlyOwner{
        IERC20(tokenAddress).transfer(msg.sender,amount);
    }

    function putNTF(address NFTAddress,uint256 tokenId) public onlyOwner{
        nft(NFTAddress).safeTransferFrom(msg.sender,address(this),tokenId);
    }
    
    function takeNFT(address NFTAddress,uint256 tokenId) public onlyOwner{
        require(block.timestamp > lockTime, "lock time");
        nft(NFTAddress).safeTransferFrom(address(this),msg.sender,tokenId);
    }

}

{
  "compilationTarget": {
    "exchange.sol": "exchange"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}