// SPDX-License-Identifier: MIT

// https://github.com/OpenZeppelin/openzeppelin-contracts

pragma solidity ^0.7.0;


abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}



interface IERC20 {
   
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);
  
    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);
  
    function approve(address spender, uint256 amount) external returns (bool);
  
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
 
    event Transfer(address indexed from, address indexed to, uint256 value);
   
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


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) {
        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;
        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;
    }
}


contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string internal _name;
    string internal _symbol;
    uint8 internal _decimals;
      
   
    function name() public view returns (string memory) {
        return _name;
    }
   
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }
 
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
   
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

   
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

  
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
   
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

   
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
   
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

   
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

   
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

   
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

  
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


interface IAToken {
    // NFT 挖矿
    function mintOnlyByNft(address _to,  uint _amount) external returns (bool);
}


contract FireToken is ERC20, IAToken {

    address public Nft;

    constructor (address _Nft) {
        _name = "FireToken";
        _symbol = "Fire";
        _decimals = 18;
        
        require(_Nft != address(0), "_Nft != address(0)");
        Nft = _Nft;

//A Token：
// erc20
// 总量：3100000
// 分配：
// 2750000通过合约兑换铸造
// 250000早鸟轮，0.0008ETH/个
// 100000预留社群运营


//         fire
// 250000：
// 0xb1fd4121084D13925326476da673e4b885aBFD3a
// 100000：
// 0x0ba0dC8b7444Ff309D7dD5a55Da5F28e83860041

        address zz = 0xb1fd4121084D13925326476da673e4b885aBFD3a;
        address yy = 0x0ba0dC8b7444Ff309D7dD5a55Da5F28e83860041;
        _mint(address(this), 2750_000 * (10 ** uint(_decimals)));
        _mint(zz,             250_000 * (10 ** uint(_decimals)));
        _mint(yy,             100_000 * (10 ** uint(_decimals)));
    }


    function mintOnlyByNft(address _to,  uint _amount) external override returns (bool) {
        require(msg.sender == Nft, "msg.sender == Nft");
        _transfer(address(this), _to, _amount);
        return true;
    }


}