pragma solidity ^0.4.24;


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 {
    function totalSupply() public view returns (uint256);

    function balanceOf(address _who) public view returns (uint256);

    function allowance(address _owner, address _spender)
        public view returns (uint256);

    function transfer(address _to, uint256 _value) public returns (bool);

    function approve(address _spender, uint256 _value)
        public returns (bool);

    function transferFrom(address _from, address _to, uint256 _value)
        public returns (bool);

    event Transfer(
        address indexed from,
        address indexed to,
        uint256 value
    );

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}


/**
 * @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.
    */
    constructor() 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) public onlyOwner {
        _transferOwnership(_newOwner);
    }

    /**
    * @dev Transfers control of the contract to a newOwner.
    * @param _newOwner The address to transfer ownership to.
    */
    function _transferOwnership(address _newOwner) internal {
        require(_newOwner != address(0));
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
}

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;

    /**
    * @dev Modifier to make a function callable only when the contract is not paused.
    */
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    /**
    * @dev Modifier to make a function callable only when the contract is paused.
    */
    modifier whenPaused() {
        require(paused);
        _;
    }

    /**
    * @dev called by the owner to pause, triggers stopped state
    */
    function pause() public onlyOwner whenNotPaused {
        paused = true;
        emit Pause();
    }

    /**
    * @dev called by the owner to unpause, returns to normal state
    */
    function unpause() public onlyOwner whenPaused {
        paused = false;
        emit Unpause();
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, reverts on overflow.
    */
    function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring '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;
        }

        uint256 c = _a * _b;
        require(c / _a == _b);

        return c;
    }

    /**
    * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
        require(_b > 0); // Solidity only automatically asserts 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;
    }

    /**
    * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
        require(_b <= _a);
        uint256 c = _a - _b;

        return c;
    }

    /**
    * @dev Adds two numbers, reverts on overflow.
    */
    function add(uint256 _a, uint256 _b) internal pure returns (uint256) {
        uint256 c = _a + _b;
        require(c >= _a);

        return c;
    }
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20,Pausable {
    using SafeMath for uint256;

    mapping(address => uint256) balances;

    mapping (address => mapping (address => uint256)) internal allowed;

    uint256 totalSupply_;

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    /**
    * @dev Function to check the amount of tokens that an owner allowed to a spender.
    * @param _owner address The address which owns the funds.
    * @param _spender address The address which will spend the funds.
    * @return A uint256 specifying the amount of tokens still available for the spender.
    */
    function allowance(
        address _owner,
        address _spender
    )
        public
        view
        returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) whenNotPaused public returns (bool) {
        require(_value <= balances[msg.sender]);
        require(_to != address(0));

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    * @dev Transfer tokens from one address to another
    * @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
    )   
        whenNotPaused
        public
        returns (bool)
    {
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);
        require(_to != address(0));

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * Beware that changing an allowance with this method brings the risk that someone may use both the old
    * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
    * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
    * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    * @param _spender The address which will spend the funds.
    * @param _value The amount of tokens to be spent.
    */
    function approve(address _spender, uint256 _value) whenNotPaused public returns (bool) {
        require(_value == 0 || (allowed[msg.sender][_spender] == 0));
        
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
    * @dev Increase the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed[_spender] == 0. To increment
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * @param _spender The address which will spend the funds.
    * @param _addedValue The amount of tokens to increase the allowance by.
    */
    function increaseApproval(
        address _spender,
        uint256 _addedValue
    )   
        whenNotPaused
        public
        returns (bool)
    {
        allowed[msg.sender][_spender] = (
        allowed[msg.sender][_spender].add(_addedValue));
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
    * @dev Decrease the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed[_spender] == 0. To decrement
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * @param _spender The address which will spend the funds.
    * @param _subtractedValue The amount of tokens to decrease the allowance by.
    */
    function decreaseApproval(
        address _spender,
        uint256 _subtractedValue
    )
        whenNotPaused
        public
        returns (bool)
    {
        uint256 oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue >= oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    function safeTransfer(
        ERC20 _token,
        address _to,
        uint256 _value
    )
      internal
    {
        require(_token.transfer(_to, _value));
    }

    function safeTransferFrom(
        ERC20 _token,
        address _from,
        address _to,
        uint256 _value
    )
      internal
    {
        require(_token.transferFrom(_from, _to, _value));
    }

    function safeApprove(
        ERC20 _token,
        address _spender,
        uint256 _value
    )
      internal
    {
        require(_token.approve(_spender, _value));
    }
}

/**
 * @title TokenVesting
 * @dev A token holder contract that can release its token balance gradually like a
 * typical vesting scheme, with a cliff and vesting period. Optionally revocable by the
 * owner.
 */
contract TokenVesting is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    event Released(uint256 amount);
    event Revoked();

    // beneficiary of tokens after they are released
    address public beneficiary;

    uint256 public cliff;
    uint256 public start;
    uint256 public duration;
    uint256 public phased;

    bool public revocable;

    mapping (address => uint256) public released;
    mapping (address => bool) public revoked;

    /**
    * @dev Creates a vesting contract that vests its balance of any ERC20 token to the
    * _beneficiary, gradually in a phased fashion until _start + _duration. By then all
    * of the balance will have vested.
    * @param _beneficiary address of the beneficiary to whom vested tokens are transferred
    * @param _cliff duration in seconds of the cliff in which tokens will begin to vest
    * @param _start the time (as Unix time) at which point vesting starts
    * @param _duration duration in seconds of the period in which the tokens will vest
    * @param _phased duration in seconds of the every release stage
    * @param _revocable whether the vesting is revocable or not
    */
    constructor(
        address _beneficiary,
        uint256 _start,
        uint256 _cliff,
        uint256 _duration,
        uint256 _phased,
        bool _revocable
    )
        public
    {
        require(_beneficiary != address(0));
        require(_cliff <= _duration);
        require(_phased <= _duration.sub(_cliff));

        beneficiary = _beneficiary;
        revocable = _revocable;
        duration = _duration;
        cliff = _start.add(_cliff);
        start = _start;
        phased = _phased;
    }

    /**
    * @notice Transfers vested tokens to beneficiary.
    * @param _token ERC20 token which is being vested
    */
    function release(ERC20 _token) public {
        uint256 unreleased = releasableAmount(_token);

        require(unreleased > 0);

        released[_token] = released[_token].add(unreleased);

        _token.safeTransfer(beneficiary, unreleased);

        emit Released(unreleased);
    }

    /**
    * @notice Allows the owner to revoke the vesting. Tokens already vested
    * remain in the contract, the rest are returned to the owner.
    * @param _token ERC20 token which is being vested
    */
    function revoke(ERC20 _token) public onlyOwner {
        require(revocable);
        require(!revoked[_token]);

        uint256 balance = _token.balanceOf(address(this));

        uint256 unreleased = releasableAmount(_token);
        uint256 refund = balance.sub(unreleased);

        revoked[_token] = true;

        _token.safeTransfer(owner, refund);

        emit Revoked();
    }

    /**
    * @dev Calculates the amount that has already vested but hasn't been released yet.
    * @param _token ERC20 token which is being vested
    */
    function releasableAmount(ERC20 _token) public view returns (uint256) {
        return vestedAmount(_token).sub(released[_token]);
    }

    /**
    * @dev Calculates the amount that has already vested.
    * @param _token ERC20 token which is being vested
    */
    function vestedAmount(ERC20 _token) public view returns (uint256) {
        uint256 currentBalance = _token.balanceOf(this);
        uint256 totalBalance = currentBalance.add(released[_token]);

        uint256 totalPhased = (start.add(duration).sub(cliff)).div(phased);
        uint256 everyPhasedReleaseAmount = totalBalance.div(totalPhased);

        if (block.timestamp < cliff.add(phased)) {
            return 0;
        } else if (block.timestamp >= start.add(duration) || revoked[_token]) {
            return totalBalance;
        } else {
            uint256 currentPhased = block.timestamp.sub(cliff).div(phased);
            return everyPhasedReleaseAmount.mul(currentPhased);
        }
    }
}