// File: /Users/xieshanfeng/IdeaProjects/COMP/contracts/NMTSwap.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.4.25;
import "@openzeppelin/contracts/access/Ownable.sol";
abstract contract IERC20{
    function transferFrom(address sender, address recipient, uint256 amount) external virtual returns (bool);
    function transfer(address recipient, uint256 amount) external virtual returns (bool);
    function balanceOf(address account) external view  virtual returns (uint256);
}

contract NMTSwap is Ownable{
    struct SwapInfo{
        string toNativeAddress;
        address fromAddress;
        uint256  amount;
    }
    event Swap(address from, string toNativeAddress,uint256 amount);

    SwapInfo[] public swaplist;
    address  public NMTContract= address(0xd81b71cBb89B2800CDb000AA277Dc1491dc923C3);


    function erc20toNative(string memory nativeAddress,uint256 amount) public returns (bool){

        require( bytes(nativeAddress).length >0 ,"native address not null");
        require( amount >= 10**18 ,"amount >= 1 NMT");

        IERC20 NMT = IERC20(NMTContract);
        NMT.transferFrom(msg.sender,address(this),amount);

        SwapInfo memory info= SwapInfo({ amount :amount,fromAddress :msg.sender,toNativeAddress : nativeAddress});
        swaplist.push(info);
        emit Swap(msg.sender,nativeAddress,amount);
        return true;
    }
    function burn(uint256 amount) public onlyOwner returns(bool) {
        IERC20 NMT = IERC20(NMTContract);
        NMT.transfer(address(0x000000000000000000000000000000000000dEaD),amount);
        return true;
    }
    function claim()public onlyOwner returns(bool) {
        IERC20 NMT = IERC20(NMTContract);
        NMT.transfer(owner(),NMT.balanceOf(address(this)));
        return true;
    }
    function getSwapRecord(uint256 index) public view returns(SwapInfo memory){
        require(swaplist.length > index,"error index");
        return swaplist[index];
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../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.
 *
 * 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// 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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}