pragma solidity ^0.4.18;

// ----------------------------------------------------------------------------
// 'HiroyukiCoin' token contract
//
// Deployed to : 0x56517aCbE66379C3f3e07EF6e4880F9717d4be11
// Symbol      : HRYK
// Name        : HiroyukiCoin
// Total supply: 20000000000000
// Decimals    : 18
// ----------------------------------------------------------------------------


// ----------------------------------------------------------------------------
// Safe maths
// ----------------------------------------------------------------------------
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }

    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);
        return a / b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}



contract ERC20Interface {
    function totalSupply() public constant returns (uint256);
    function balanceOf(address tokenOwner) public constant returns (uint256 balance);
    function allowance(address tokenOwner, address spender) public constant returns (uint256 remaining);
    function transfer(address to, uint256 tokens) public returns (bool success);
    function approve(address spender, uint256 tokens) public returns (bool success);
    function transferFrom(address from, address to, uint256 tokens) public returns (bool success);
    event Transfer(address indexed from, address indexed to, uint256 tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint256 tokens);
    event Burn(address indexed from, uint256 tokens);
}



contract ApproveAndCallFallBack {
    function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
}



contract Owned {
    address public owner;
    address public newOwner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    function Owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        newOwner = _newOwner;
    }
    function acceptOwnership() public {
        require(msg.sender == newOwner);
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}



contract HiroyukiCoin is ERC20Interface, Owned {
    using SafeMath for uint;

    address public owner;
    string public symbol;
    string public  name;
    uint8 public decimals;
    
    uint256 public _totalSupply;
    uint256 public _currentSupply;

    uint public startDate;
    uint public endDate;

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;


    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    function HiroyukiCoin() public {
        owner = msg.sender;

        symbol = "HRYK";
        name = "HiroyukiCoin";
        decimals = 18;

        _totalSupply = 20000000000000000000000000000000;
        _currentSupply = 0;

        startDate = now;
        endDate = now + 8 weeks;

        balances[owner] = _totalSupply;
        Transfer(address(0), owner, _totalSupply);
    }


    // ------------------------------------------------------------------------
    // Total supply
    // ------------------------------------------------------------------------
    function totalSupply() public constant returns (uint256) {
        return _totalSupply - balances[address(0)];
    }


    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner) public constant returns (uint256 balance) {
        return balances[tokenOwner];
    }


    // ------------------------------------------------------------------------
    // Transfer the balance from token owner's account to `to` account
    // - Owner's account must have sufficient balance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transfer(address to, uint256 tokens) public returns (bool success) {
        require(to != address(0));
        require(tokens <= balances[msg.sender]);
        balances[msg.sender] = SafeMath.sub(balances[msg.sender], tokens);
        balances[to] = SafeMath.add(balances[to], tokens);
        Transfer(msg.sender, to, tokens);
        return true;
    }


    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    //
    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
    // recommends that there are no checks for the approval double-spend attack
    // as this should be implemented in user interfaces
    // ------------------------------------------------------------------------
    function approve(address spender, uint256 tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        Approval(msg.sender, spender, tokens);
        return true;
    }


    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    //
    // The calling account must already have sufficient tokens approve(...)-d
    // for spending from the `from` account and
    // - From account must have sufficient balance to transfer
    // - Spender must have sufficient allowance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transferFrom(address from, address to, uint256 tokens) public returns (bool success) {
        require(to != address(0));
        require(tokens <= balances[from]);
        require(tokens <= allowed[from][msg.sender]);
        balances[from] = SafeMath.sub(balances[from], tokens);
        allowed[from][msg.sender] = SafeMath.sub(allowed[from][msg.sender], tokens);
        balances[to] = SafeMath.add(balances[to], tokens);
        Transfer(from, to, tokens);
        return true;
    }

    function burn(uint256 tokens) public returns (bool success) {
        require(tokens <= balances[msg.sender]);
        balances[msg.sender] = SafeMath.sub(balances[msg.sender], tokens);
        _totalSupply = SafeMath.sub(_totalSupply, tokens);
        Burn(msg.sender, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Returns the amount of tokens approved by the owner that can be
    // transferred to the spender's account
    // ------------------------------------------------------------------------
    function allowance(address tokenOwner, address spender) public constant returns (uint256 remaining) {
        return allowed[tokenOwner][spender];
    }


    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account. The `spender` contract function
    // `receiveApproval(...)` is then executed
    // ------------------------------------------------------------------------
    function approveAndCall(address spender, uint256 tokens, bytes data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
        return true;
    }


    // ------------------------------------------------------------------------
    // Owner can transfer out any accidentally sent ERC20 tokens
    // ------------------------------------------------------------------------
    function transferAnyERC20Token(address tokenAddress, uint256 tokens) public onlyOwner returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }
}