// Vulnerability label: TD1
pragma solidity ^0.4.18;
// GIGAPOSICOIN

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/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
 
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 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); // There is no case in which this doesn't hold
        return c;
    }

    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) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}



/**
 * @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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the
     *      sender account.
     */
    function Ownable() public {
        owner = msg.sender;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) onlyOwner public {
        require(newOwner != address(0));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}



/**
 * @title ERC223
 * @dev ERC223 contract interface with ERC20 functions and events
 *      Fully backward compatible with ERC20
 *      Recommended implementation used at https://github.com/Dexaran/ERC223-token-standard/tree/Recommended
 */
contract ERC223 {
    uint public totalSupply;

    // ERC223 and ERC20 functions and events
    function balanceOf(address who) public view returns (uint);
    function totalSupply() public view returns (uint256 _supply);
    function transfer(address to, uint value) public returns (bool ok);
    function transfer(address to, uint value, bytes data) public returns (bool ok);
    function transfer(address to, uint value, bytes data, string customFallback) public returns (bool ok);
    event Transfer(address indexed from, address indexed to, uint value, bytes indexed data);

    // ERC223 functions
    function name() public view returns (string _name);
    function symbol() public view returns (string _symbol);
    function decimals() public view returns (uint8 _decimals);

    // ERC20 functions and events
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    function approve(address _spender, uint256 _value) public returns (bool success);
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}



/**
 * @title ContractReceiver
 * @dev Contract that is working with ERC223 tokens
 */
 contract ContractReceiver {

    struct TKN {
        address sender;
        uint value;
        bytes data;
        bytes4 sig;
    }

    function tokenFallback(address _from, uint _value, bytes _data) public pure {
        TKN memory tkn;
        tkn.sender = _from;
        tkn.value = _value;
        tkn.data = _data;
        uint32 u = uint32(_data[3]) + (uint32(_data[2]) << 8) + (uint32(_data[1]) << 16) + (uint32(_data[0]) << 24);
        tkn.sig = bytes4(u);
        
        /*
         * tkn variable is analogue of msg variable of Ether transaction
         * tkn.sender is person who initiated this token transaction   (analogue of msg.sender)
         * tkn.value the number of tokens that were sent   (analogue of msg.value)
         * tkn.data is data of token transaction   (analogue of msg.data)
         * tkn.sig is 4 bytes signature of function if data of token transaction is a function execution
         */
    }
}

/**
 * @title GIGAPOSICOIN
 */
contract GIGAPOSICOIN is ERC223, Ownable {
    using SafeMath for uint256;

    string public name = "GIGAPOSICOIN";
    string public symbol = "Gposi";
    uint8 public decimals = 8;
    uint256 public totalSupply = 334e6 * 1e8;
    uint256 public distributeAmount = 0;            // ここを1にすると投票機能が動くけど動くけど今回は動くけど今回はいらない
    bool public mintingFinished = false;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping (address => uint256)) public allowance;
    mapping (address => bool) public frozenAccount;
    mapping (address => uint256) public unlockUnixTime;
    
    event FrozenFunds(address indexed target, bool frozen);
    event LockedFunds(address indexed target, uint256 locked);
    event Burn(address indexed from, uint256 amount);
    event Mint(address indexed to, uint256 amount);
    event MintFinished();


    /** 
     * @dev Constructor is called only once and can not be called again
     */
    function GIGAPOSICOIN() public {
        balanceOf[msg.sender] = totalSupply;
    }


    function name() public view returns (string _name) {
        return name;
    }

    function symbol() public view returns (string _symbol) {
        return symbol;
    }

    function decimals() public view returns (uint8 _decimals) {
        return decimals;
    }

    function totalSupply() public view returns (uint256 _totalSupply) {
        return totalSupply;
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balanceOf[_owner];
    }


    /**
     * @dev Prevent targets from sending or receiving tokens
     * @param targets Addresses to be frozen
     * @param isFrozen either to freeze it or not
     * 特定のアドレスを凍結
     */
    function freezeAccounts(address[] targets, bool isFrozen) onlyOwner public {
        require(targets.length > 0);

        for (uint j = 0; j < targets.length; j++) {
            require(targets[j] != 0x0);
            frozenAccount[targets[j]] = isFrozen;
            FrozenFunds(targets[j], isFrozen);
        }
    }

    /**
     * @dev Prevent targets from sending or receiving tokens by setting Unix times
     * @param targets Addresses to be locked funds
     * @param unixTimes Unix times when locking up will be finished
     * アカウントをロックアップする機能
     */
    function lockupAccounts(address[] targets, uint[] unixTimes) onlyOwner public {
        require(targets.length > 0
                && targets.length == unixTimes.length);
                
        for(uint j = 0; j < targets.length; j++){
            require(unlockUnixTime[targets[j]] < unixTimes[j]);
            unlockUnixTime[targets[j]] = unixTimes[j];
            LockedFunds(targets[j], unixTimes[j]);
        }
    }


    /**
     * @dev Function that is called when a user or another contract wants to transfer funds
     */
    function transfer(address _to, uint _value, bytes _data, string _custom_fallback) public returns (bool success) {
        require(_value > 0
                && frozenAccount[msg.sender] == false 
                && frozenAccount[_to] == false
                && now > unlockUnixTime[msg.sender] 
                && now > unlockUnixTime[_to]);

        if (isContract(_to)) {
            require(balanceOf[msg.sender] >= _value);
            balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
            balanceOf[_to] = balanceOf[_to].add(_value);
            assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
            Transfer(msg.sender, _to, _value, _data);
            Transfer(msg.sender, _to, _value);
            return true;
        } else {
            return transferToAddress(_to, _value, _data);
        }
    }

    function transfer(address _to, uint _value, bytes _data) public  returns (bool success) {
        require(_value > 0
                && frozenAccount[msg.sender] == false 
                && frozenAccount[_to] == false
                && now > unlockUnixTime[msg.sender] 
                && now > unlockUnixTime[_to]);

        if (isContract(_to)) {
            return transferToContract(_to, _value, _data);
        } else {
            return transferToAddress(_to, _value, _data);
        }
    }

    /**
     * @dev Standard function transfer similar to ERC20 transfer with no _data
     *      Added due to backwards compatibility reasons
     */
    function transfer(address _to, uint _value) public returns (bool success) {
        require(_value > 0
                && frozenAccount[msg.sender] == false 
                && frozenAccount[_to] == false
                && now > unlockUnixTime[msg.sender] 
                && now > unlockUnixTime[_to]);

        bytes memory empty;
        if (isContract(_to)) {
            return transferToContract(_to, _value, empty);
        } else {
            return transferToAddress(_to, _value, empty);
        }
    }

    // assemble the given address bytecode. If bytecode exists then the _addr is a contract.
    function isContract(address _addr) private view returns (bool is_contract) {
        uint length;
        assembly {
            //retrieve the size of the code on target address, this needs assembly
            length := extcodesize(_addr)
        }
        return (length > 0);
    }

    // function that is called when transaction target is an address
    function transferToAddress(address _to, uint _value, bytes _data) private returns (bool success) {
        require(balanceOf[msg.sender] >= _value);
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
        balanceOf[_to] = balanceOf[_to].add(_value);
        Transfer(msg.sender, _to, _value, _data);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    // function that is called when transaction target is a contract
    function transferToContract(address _to, uint _value, bytes _data) private returns (bool success) {
        require(balanceOf[msg.sender] >= _value);
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
        balanceOf[_to] = balanceOf[_to].add(_value);
        ContractReceiver receiver = ContractReceiver(_to);
        receiver.tokenFallback(msg.sender, _value, _data);
        Transfer(msg.sender, _to, _value, _data);
        Transfer(msg.sender, _to, _value);
        return true;
    }



    /**
     * @dev Transfer tokens from one address to another
     *      Added due to backwards compatibility with ERC20
     * @param _from address The address which you want to send tokens from
     * @param _to address The address which you want to transfer to
     * @param _value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_to != address(0)
                && _value > 0
                && balanceOf[_from] >= _value
                && allowance[_from][msg.sender] >= _value
                && frozenAccount[_from] == false 
                && frozenAccount[_to] == false
                && now > unlockUnixTime[_from] 
                && now > unlockUnixTime[_to]);

        balanceOf[_from] = balanceOf[_from].sub(_value);
        balanceOf[_to] = balanceOf[_to].add(_value);
        allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
        Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Allows _spender to spend no more than _value tokens in your behalf
     *      Added due to backwards compatibility with ERC20
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     */
    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender
     *      Added due to backwards compatibility with ERC20
     * @param _owner address The address which owns the funds
     * @param _spender address The address which will spend the funds
     */
    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowance[_owner][_spender];
    }



    /**
     * @dev Burns a specific amount of tokens.
     * @param _from The address that will burn the tokens.
     * @param _unitAmount The amount of token to be burned.
     */
    function burn(address _from, uint256 _unitAmount) onlyOwner public {
        require(_unitAmount > 0
                && balanceOf[_from] >= _unitAmount);

        balanceOf[_from] = balanceOf[_from].sub(_unitAmount);
        totalSupply = totalSupply.sub(_unitAmount);
        Burn(_from, _unitAmount);
    }


    modifier canMint() {
        require(!mintingFinished);
        _;
    }

    /**
     * @dev Function to mint tokens
     * @param _to The address that will receive the minted tokens.
     * @param _unitAmount The amount of tokens to mint.
     */
    function mint(address _to, uint256 _unitAmount) onlyOwner canMint public returns (bool) {
        require(_unitAmount > 0);
        
        totalSupply = totalSupply.add(_unitAmount);
        balanceOf[_to] = balanceOf[_to].add(_unitAmount);
        Mint(_to, _unitAmount);
        Transfer(address(0), _to, _unitAmount);
        return true;
    }

    /**
     * @dev Function to stop minting new tokens.
     */
    function finishMinting() onlyOwner canMint public returns (bool) {
        mintingFinished = true;
        MintFinished();
        return true;
    }



    /**
     * @dev Function to distribute tokens to the list of addresses by the provided amount
     */
    function distributeAirdrop(address[] addresses, uint256 amount) public returns (bool) {
        require(amount > 0 
                && addresses.length > 0
                && frozenAccount[msg.sender] == false
                && now > unlockUnixTime[msg.sender]);

        amount = amount.mul(1e8);
        uint256 totalAmount = amount.mul(addresses.length);
        require(balanceOf[msg.sender] >= totalAmount);
        
        for (uint j = 0; j < addresses.length; j++) {
            require(addresses[j] != 0x0
                    && frozenAccount[addresses[j]] == false
                    && now > unlockUnixTime[addresses[j]]);

            balanceOf[addresses[j]] = balanceOf[addresses[j]].add(amount);
            Transfer(msg.sender, addresses[j], amount);
        }
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(totalAmount);
        return true;
    }

    function distributeAirdrop(address[] addresses, uint[] amounts) public returns (bool) {
        require(addresses.length > 0
                && addresses.length == amounts.length
                && frozenAccount[msg.sender] == false
                && now > unlockUnixTime[msg.sender]);
                
        uint256 totalAmount = 0;
        
        for(uint j = 0; j < addresses.length; j++){
            require(amounts[j] > 0
                    && addresses[j] != 0x0
                    && frozenAccount[addresses[j]] == false
                    && now > unlockUnixTime[addresses[j]]);
                    
            amounts[j] = amounts[j].mul(1e8);
            totalAmount = totalAmount.add(amounts[j]);
        }
        require(balanceOf[msg.sender] >= totalAmount);
        
        for (j = 0; j < addresses.length; j++) {
            balanceOf[addresses[j]] = balanceOf[addresses[j]].add(amounts[j]);
            Transfer(msg.sender, addresses[j], amounts[j]);
        }
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(totalAmount);
        return true;
    }

    /**
     * @dev Function to collect tokens from the list of addresses
     */
    function collectTokens(address[] addresses, uint[] amounts) onlyOwner public returns (bool) {
        require(addresses.length > 0
                && addresses.length == amounts.length);

        uint256 totalAmount = 0;
        
        for (uint j = 0; j < addresses.length; j++) {
            require(amounts[j] > 0
                    && addresses[j] != 0x0
                    && frozenAccount[addresses[j]] == false
                    && now > unlockUnixTime[addresses[j]]);
                    
            amounts[j] = amounts[j].mul(1e8);
            require(balanceOf[addresses[j]] >= amounts[j]);
            balanceOf[addresses[j]] = balanceOf[addresses[j]].sub(amounts[j]);
            totalAmount = totalAmount.add(amounts[j]);
            Transfer(addresses[j], msg.sender, amounts[j]);
        }
        balanceOf[msg.sender] = balanceOf[msg.sender].add(totalAmount);
        return true;
    }


    function setDistributeAmount(uint256 _unitAmount) onlyOwner public {
        distributeAmount = _unitAmount;
    }
    
    /**
     * @dev Function to distribute tokens to the msg.sender automatically
     *      If distributeAmount is 0, this function doesn't work
     */
    function autoDistribute() payable public {
        require(distributeAmount > 0
                && balanceOf[owner] >= distributeAmount
                && frozenAccount[msg.sender] == false
                && now > unlockUnixTime[msg.sender]);
        if(msg.value > 0) owner.transfer(msg.value);
        
        balanceOf[owner] = balanceOf[owner].sub(distributeAmount);
        balanceOf[msg.sender] = balanceOf[msg.sender].add(distributeAmount);
        Transfer(owner, msg.sender, distributeAmount);
    }

    /**
     * @dev fallback function
     */
    function() payable public {
        autoDistribute();
     }

}