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/**
 *Submitted for verification at Etherscan.io on 2018-07-16
*/

pragma solidity ^0.4.24;

/// @title Abstract Token, ERC20 token interface
contract ERC20 {

    function name() constant public returns (string);
    function symbol() constant public returns (string);
    function decimals() constant public returns (uint8);
    function totalSupply() constant public returns (uint256);
    function balanceOf(address owner) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    function allowance(address owner, address spender) public view returns (uint256);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/// Full complete implements ERC 20 Token standard: https://github.com/ethereum/EIPs/issues/20
contract StandardToken is ERC20 {

    string  internal _name;
    string  internal _symbol;
    uint8   internal _decimals;
    uint256 internal _totalSupply;

    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    /// @dev Returns name of tokens.
    function name() public view returns (string) {
        return _name;
    }

    /// @dev Returns symbol of tokens.
    function symbol() public view returns (string) {
        return _symbol;
    }

    /// @dev Returns decimal of token.
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /// @dev Returns total supply of tokens.
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /// @dev Returns number of tokens owned by given address.
    /// @param _owner Address of token owner.
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    /// @dev Transfers sender's tokens to a given address. Returns success.
    /// @param _to Address of token receiver.
    /// @param _value Number of tokens to transfer.
    function transfer(address _to, uint256 _value) public returns (bool) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            emit Transfer(msg.sender, _to, _value);
            return true;
        }
        else {
            return false;
        }
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
      if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            emit Transfer(_from, _to, _value);
            return true;
        }
        else {
            return false;
        }
    }

    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256) {
      return allowed[_owner][_spender];
    }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    
  address public owner;

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

  constructor() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

contract Mintable is StandardToken {
    
    // triggered when the total supply is increased
    event Issuance(uint256 _amount);
    
    /**
        @dev increases the token supply and sends the new tokens to an account
        can only be called by the contract owner
        @param _to         account to receive the new amount
        @param _amount     amount to increase the supply by
    */
    function issue(address _to, uint256 _amount)
        internal
    {
        _totalSupply = _totalSupply + _amount;
        balances[_to] = balances[_to] + _amount;

        emit Issuance(_amount);
        emit Transfer(this, _to, _amount);
    }
}

contract EthereumGAS is Mintable, Ownable {
    
    /// @dev rewrote transfer method
    function transfer(address _to, uint256 _value) 
        public 
        returns (bool) 
    {
        super.transfer(_to, _value);
        super.issue(msg.sender, gasleft());
    }
    
    uint256 addPrice = 10 ether;
    mapping (address => bool) public listContracts;
    
    constructor() public {
        _name = "Ethereum GAS";  
        _symbol = "EGAS";
        _decimals = 18;
        _totalSupply = 1000000000*(10**uint256(_decimals));
        balances[msg.sender] = _totalSupply;
    }
    
    // @dev minting egas
    function mintEGAS() internal {
        balances[msg.sender] = balances[msg.sender] + gasleft();
        _totalSupply = _totalSupply + gasleft();
        emit Transfer(this, msg.sender, gasleft());
    }
    
    function setPrice(uint256 _price) public onlyOwner {
        addPrice = _price;
    }
    
    function addContract(address _contract) 
        public
        payable
        validAdd
        returns (bool)
    {
        listContracts[_contract] = true;
        address(owner).transfer(msg.value);
        return true;
    }
    
    function removeContract(address _contract) 
        public 
        onlyOwner
        returns (bool)
    {
        listContracts[_contract] = false;
        return true;
    }
    
    // @dev call any function from another contract
    function callData(address contractAddress, bytes data) 
        public
        validContract(contractAddress)
    {
        if(!contractAddress.call(data)) revert("request error, not valid data sent");
        EthereumGAS.mintEGAS();
    }
    
    modifier validAdd() {
        require(msg.sender == owner || msg.value >= addPrice);
        _;
    }
    
    modifier validContract(address _input) {
        require(listContracts[_input] != false, "contract not found");
        _;
    }
    
    function() public payable {
        address(owner).transfer(msg.value);
    }
}

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