pragma solidity ^0.4.22;

/**
*  ** SAFEMATH **
*/

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */

    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        // uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return a / b;
    }

    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}

/**
*  ** INTERFACES **
*/

interface ERC20 {
    function transferFrom(address _from, address _to, uint _value) public returns (bool);
    function approve(address _spender, uint _value) public returns (bool);
    function allowance(address _owner, address _spender) public view returns (uint);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}

contract ERC223ReceivingContract {
    function tokenFallback(address _from, uint _value, bytes _data) public;
}

interface ERC223 {
    function transfer(address _to, uint _value, bytes _data) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint value, bytes indexed data);
}

contract FoundationToken {
    string internal _symbol;
    string internal _name;
    uint8 internal _decimals;
    uint internal _totalSupply = 1000;
    mapping (address => uint) internal _balanceOf;
    mapping (address => mapping (address => uint)) internal _allowances;
    
    constructor(string symbol, string name, uint8 decimals) public {
        _symbol = symbol;
        _name = name;
        _decimals = decimals;
        _totalSupply = 1000*1000000 * (uint256(10) ** decimals);
    }
    
    function name() public view returns (string) {
        return _name;
    }
    
    function symbol() public view returns (string) {
        return _symbol;
    }
    
    function decimals() public view returns (uint8) {
        return _decimals;
    }
    
    function totalSupply() public view returns (uint) {
        return _totalSupply;
    }
    
    function balanceOf(address _addr) public view returns (uint);

    // @notice send `_value` token to `_to` from `msg.sender`
    // @param _to The address of the recipient
    // @param _value The amount of token to be transferred
    // @return Whether the transfer was successful or not
    function transfer(address _to, uint _value) public returns (bool);
    event Transfer(address indexed _from, address indexed _to, uint _value);
}

contract ShapeCoin is FoundationToken("SHPC", "ShapeCoin", 18), ERC20, ERC223 {

    using SafeMath for uint;

    constructor() public {
        _balanceOf[msg.sender] = _totalSupply;
    }

    function totalSupply() public view returns (uint) {
        return _totalSupply;
    }

    function balanceOf(address _addr) public view returns (uint) {
        return _balanceOf[_addr];
    }

    /**
     *  ** FOR ADDRESSES **
     *
     * @dev Transfer the specified amount of tokens to the specified address.
     *      This function works the same with the previous one
     *      but doesn't contain `_data` param.
     *      Added due to backwards compatibility reasons.
     *
     *  @param _to    Receiver address.
     *  @param _value Amount of tokens that will be transferred.
     *  @return Whether the transfer was successful or not
     */

    function transfer(address _to, uint _value) public returns (bool) {
        if (_value > 0 && _value <= _balanceOf[msg.sender] && !isContract(_to)) {
            _balanceOf[msg.sender] = _balanceOf[msg.sender].sub(_value);
            _balanceOf[_to] = _balanceOf[_to].add(_value);
            emit Transfer(msg.sender, _to, _value);
            return true;
        }
        return false;
    }

    /**
     *  ** FOR CONTRACTS **
     *
     *  @dev Transfer the specified amount of tokens to the specified address.
     *      Invokes the `tokenFallback` function if the recipient is a contract.
     *      The token transfer fails if the recipient is a contract
     *      but does not implement the `tokenFallback` function
     *      or the fallback function to receive funds.
     *
     *  @notice send `_value` token to `_to` from `msg.sender`
     *  @param _to The address of the recipient
     *  @param _value The amount of token to be transferred
     *  @param _data The data to be passed to our contract that we are actually going to allow to have data passed to
     *  @return Whether the transfer was successful or not
     */
    
    function transfer(address _to, uint _value, bytes _data) public returns (bool) {
        if (_value > 0 && _value <= _balanceOf[msg.sender] && isContract(_to)) {
            _balanceOf[msg.sender] = _balanceOf[msg.sender].sub(_value);
            _balanceOf[_to] = _balanceOf[_to].add(_value);
            ERC223ReceivingContract _contract = ERC223ReceivingContract(_to);
            _contract.tokenFallback(msg.sender, _value, _data);
            emit Transfer(msg.sender, _to, _value, _data);
            return true;
        }
        return false;
    }

    function isContract(address _addr) private view returns (bool) {
        uint codeSize;
        /* solium-disable */
        assembly {
            codeSize := extcodesize(_addr)
        }
        /* solium-enable */
        return codeSize > 0;
    }

    function transferFrom(address _from, address _to, uint _value) public returns (bool) {
        if (_allowances[_from][msg.sender] > 0 &&
            _value > 0 &&
            _allowances[_from][msg.sender] >= _value &&
            _balanceOf[_from] >= _value) {
            _balanceOf[_from] = _balanceOf[_from].sub(_value);
            _balanceOf[_to] = _balanceOf[_to].add(_value);
            _allowances[_from][msg.sender] -= _value;
            emit Transfer(_from, _to, _value);
            return true;
        }
        return false;
    }

    function approve(address _spender, uint _value) public returns (bool) {
        _allowances[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public constant returns (uint) {
        return _allowances[_owner][_spender];
    }
}