contract TokenVesting is Ownable {
  using SafeMath for uint256;
  using SafeERC20 for ERC20Basic;

  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;

  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 linear 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 _revocable whether the vesting is revocable or not
   */
  constructor(
    address _beneficiary,
    uint256 _start,
    uint256 _cliff,
    uint256 _duration,
    bool _revocable
  )
    public
  {
    require(_beneficiary != address(0));
    require(_cliff <= _duration);

    beneficiary = _beneficiary;
    revocable = _revocable;
    duration = _duration;
    cliff = _start.add(_cliff);
    start = _start;
  }

  /**
   * @notice Transfers vested tokens to beneficiary.
   * @param _token ERC20 token which is being vested
   */
  function release(ERC20Basic _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(ERC20Basic _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(ERC20Basic _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(ERC20Basic _token) public view returns (uint256) {
    uint256 currentBalance = _token.balanceOf(address(this));
    uint256 totalBalance = currentBalance.add(released[_token]);

    if (block.timestamp < cliff) {
      return 0;
    } else if (block.timestamp >= start.add(duration) || revoked[_token]) {
      return totalBalance;
    } else {
      return totalBalance.mul(block.timestamp.sub(start)).div(duration);
    }
  }
}
function vestedAmount(ERC20Basic _token) public view returns (uint256) {
  uint256 currentBalance = _token.balanceOf(address(this));
  uint256 totalBalance = currentBalance.add(released[_token]);

  if (block.timestamp < cliff) {
    return 0;
  } else if (block.timestamp >= start.add(duration) || revoked[_token]) {
    return totalBalance;
  } else {
    return totalBalance.mul(block.timestamp.sub(start)).div(duration);
  }
}

/**
 * @dev Calculates the amount that has already vested.
 * @param _token ERC20 token which is being vested
 */