pragma solidity 0.4.24;

// File: zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @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) public onlyOwner {
		require(newOwner != address(0));
		emit OwnershipTransferred(owner, newOwner);
		owner = newOwner;
	}

}

// File: zeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

	/**
	 * @dev Multiplies two numbers, throws on overflow.
	 */
	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;
	}

	/**
	 * @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;
	}
}

// File: zeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
	function totalSupply() public view returns (uint256);
	function balanceOf(address who) public view returns (uint256);
	function transfer(address to, uint256 value) public returns (bool);
	event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: zeppelin-solidity/contracts/token/ERC20/BasicToken.sol

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
	using SafeMath for uint256;

	mapping(address => uint256) balances;

	uint256 totalSupply_;

	/**
	* @dev total number of tokens in existence
	*/
	function totalSupply() public view returns (uint256) {
		return totalSupply_;
	}

	/**
	* @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) public returns (bool) {
		require(_to != address(0));
		require(_value <= balances[msg.sender]);

		balances[msg.sender] = balances[msg.sender].sub(_value);
		balances[_to] = balances[_to].add(_value);
		emit Transfer(msg.sender, _to, _value);
		return true;
	}

	/**
	* @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];
	}

}

// File: zeppelin-solidity/contracts/token/ERC20/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
	function allowance(address owner, address spender) public view returns (uint256);
	function transferFrom(address from, address to, uint256 value) public returns (bool);
	function approve(address spender, uint256 value) public returns (bool);
	event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: zeppelin-solidity/contracts/token/ERC20/StandardToken.sol

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

	mapping (address => mapping (address => uint256)) internal allowed;


	/**
	* @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) public returns (bool) {
		require(_to != address(0));
		require(_value <= balances[_from]);
		require(_value <= allowed[_from][msg.sender]);

		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) public returns (bool) {
		allowed[msg.sender][_spender] = _value;
		emit Approval(msg.sender, _spender, _value);
		return true;
	}

	/**
	 * @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 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, uint _addedValue) 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, uint _subtractedValue) public returns (bool) {
		uint 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;
	}

}


// File: zeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @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() onlyOwner whenNotPaused public {
		paused = true;
		emit Pause();
	}

	/**
	* @dev called by the owner to unpause, returns to normal state
	*/
	function unpause() onlyOwner whenPaused public {
		paused = false;
		emit Unpause();
	}
}

// File: zeppelin-solidity/contracts/crowdsale/Crowdsale.sol

/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale,
 * allowing investors to purchase tokens with ether. This contract implements
 * such functionality in its most fundamental form and can be extended to provide additional
 * functionality and/or custom behavior.
 * The external interface represents the basic interface for purchasing tokens, and conform
 * the base architecture for crowdsales. They are *not* intended to be modified / overriden.
 * The internal interface conforms the extensible and modifiable surface of crowdsales. Override
 * the methods to add functionality. Consider using 'super' where appropiate to concatenate
 * behavior.
 */
contract Crowdsale {
	using SafeMath for uint256;

	// The token being sold
	ERC20 public token;

	// Address where funds are collected
	address public wallet;

	// How many token units a buyer gets per wei
	uint256 public rate;

	// Amount of wei raised
	uint256 public weiRaised;

	/**
	* Event for token purchase logging
	* @param purchaser who paid for the tokens
		* @param beneficiary who got the tokens
	* @param value weis paid for purchase
		* @param amount amount of tokens purchased
	*/
	event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

	/**
	* @param _rate Number of token units a buyer gets per wei
	* @param _wallet Address where collected funds will be forwarded to
	* @param _token Address of the token being sold
	*/
	function Crowdsale(uint256 _rate, address _wallet, ERC20 _token) public {
		require(_rate > 0);
		require(_wallet != address(0));
		require(_token != address(0));

		rate = _rate;
		wallet = _wallet;
		token = _token;
	}

	// -----------------------------------------
	// Crowdsale external interface
	// -----------------------------------------

	/**
	* @dev fallback function ***DO NOT OVERRIDE***
	*/
	function () external payable {
		buyTokens(msg.sender);
	}

	/**
	* @dev low level token purchase ***DO NOT OVERRIDE***
	* @param _beneficiary Address performing the token purchase
	*/
	function buyTokens(address _beneficiary) public payable {

		uint256 weiAmount = msg.value;
		_preValidatePurchase(_beneficiary, weiAmount);

		// calculate token amount to be created
		uint256 tokens = _getTokenAmount(weiAmount);

		// update state
		weiRaised = weiRaised.add(weiAmount);

		_processPurchase(_beneficiary, tokens);
		emit TokenPurchase(
			msg.sender,
			_beneficiary,
			weiAmount,
			tokens
		);

		_updatePurchasingState(_beneficiary, weiAmount);

		_forwardFunds();
		_postValidatePurchase(_beneficiary, weiAmount);
	}

	// -----------------------------------------
	// Internal interface (extensible)
	// -----------------------------------------

	/**
	* @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use super to concatenate validations.
	* @param _beneficiary Address performing the token purchase
	* @param _weiAmount Value in wei involved in the purchase
	*/
	function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
		require(_beneficiary != address(0));
		require(_weiAmount != 0);
	}

	/**
	* @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid conditions are not met.
	* @param _beneficiary Address performing the token purchase
	* @param _weiAmount Value in wei involved in the purchase
	*/
	function _postValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
		// optional override
	}

	/**
	* @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.
	* @param _beneficiary Address performing the token purchase
	* @param _tokenAmount Number of tokens to be emitted
	*/
	function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
		token.transfer(_beneficiary, _tokenAmount);
	}

	/**
	* @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.
	* @param _beneficiary Address receiving the tokens
	* @param _tokenAmount Number of tokens to be purchased
	*/
	function _processPurchase(address _beneficiary, uint256 _tokenAmount) internal {
		_deliverTokens(_beneficiary, _tokenAmount);
	}

	/**
	* @dev Override for extensions that require an internal state to check for validity (current user contributions, etc.)
	* @param _beneficiary Address receiving the tokens
	* @param _weiAmount Value in wei involved in the purchase
	*/
	function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal {
		// optional override
	}

	/**
	* @dev Override to extend the way in which ether is converted to tokens.
	* @param _weiAmount Value in wei to be converted into tokens
	* @return Number of tokens that can be purchased with the specified _weiAmount
	*/
	function _getTokenAmount(uint256 _weiAmount) internal view returns (uint256) {
		return _weiAmount.mul(66666667).div(5000);
	}

	/**
	* @dev Determines how ETH is stored/forwarded on purchases.
	*/
	function _forwardFunds() internal {
		wallet.transfer(msg.value);
	}
}

// File: zeppelin-solidity/contracts/crowdsale/validation/CappedCrowdsale.sol

/**
 * @title CappedCrowdsale
 * @dev Crowdsale with a limit for total contributions.
 */
contract CappedCrowdsale is Crowdsale {
	using SafeMath for uint256;

	uint256 public cap;

	/**
	* @dev Constructor, takes maximum amount of wei accepted in the crowdsale.
	* @param _cap Max amount of wei to be contributed
	*/
	function CappedCrowdsale(uint256 _cap) public {
		require(_cap > 0);
		cap = _cap;
	}

	/**
	* @dev Checks whether the cap has been reached. 
	* @return Whether the cap was reached
	*/
	function capReached() public view returns (bool) {
		return weiRaised >= cap;
	}

	/**
	* @dev Extend parent behavior requiring purchase to respect the funding cap.
	* @param _beneficiary Token purchaser
	* @param _weiAmount Amount of wei contributed
	*/
	function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
		super._preValidatePurchase(_beneficiary, _weiAmount);
		require(weiRaised.add(_weiAmount) <= cap);
	}

}

contract AmountLimitCrowdsale is Crowdsale, Ownable {
	using SafeMath for uint256;

	uint256 public min;
	uint256 public max;

	mapping(address => uint256) public contributions;

	function AmountLimitCrowdsale(uint256 _min, uint256 _max) public {
		require(_min > 0);
		require(_max > _min);
		// each person should contribute between min-max amount of wei
		min = _min;
		max = _max;
	}

	function getUserContribution(address _beneficiary) public view returns (uint256) {
		return contributions[_beneficiary];
	}

	function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
		super._preValidatePurchase(_beneficiary, _weiAmount);
		require(contributions[_beneficiary].add(_weiAmount) <= max);
		require(contributions[_beneficiary].add(_weiAmount) >= min);
	}

	function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal {
		super._updatePurchasingState(_beneficiary, _weiAmount);
		// update total contribution
		contributions[_beneficiary] = contributions[_beneficiary].add(_weiAmount);
	}
}

// File: zeppelin-solidity/contracts/crowdsale/validation/TimedCrowdsale.sol

/**
 * @title TimedCrowdsale
 * @dev Crowdsale accepting contributions only within a time frame.
 */
contract TimedCrowdsale is Crowdsale {
	using SafeMath for uint256;

	uint256 public openingTime;
	uint256 public closingTime;

	/**
	* @dev Reverts if not in crowdsale time range.
	*/
	modifier onlyWhileOpen {
		// solium-disable-next-line security/no-block-members
		require(block.timestamp >= openingTime && block.timestamp <= closingTime);
		_;
	}

	/**
	* @dev Constructor, takes crowdsale opening and closing times.
	* @param _openingTime Crowdsale opening time
	* @param _closingTime Crowdsale closing time
	*/
	function TimedCrowdsale(uint256 _openingTime, uint256 _closingTime) public {
		// solium-disable-next-line security/no-block-members
		require(_openingTime >= block.timestamp);
		require(_closingTime >= _openingTime);

		openingTime = _openingTime;
		closingTime = _closingTime;
	}

	/**
	* @dev Checks whether the period in which the crowdsale is open has already elapsed.
	* @return Whether crowdsale period has elapsed
	*/
	function hasClosed() public view returns (bool) {
		// solium-disable-next-line security/no-block-members
		return block.timestamp > closingTime;
	}

	/**
	* @dev Extend parent behavior requiring to be within contributing period
	* @param _beneficiary Token purchaser
	* @param _weiAmount Amount of wei contributed
	*/
	function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal onlyWhileOpen {
		super._preValidatePurchase(_beneficiary, _weiAmount);
	}

}

// File: zeppelin-solidity/contracts/crowdsale/validation/WhitelistedCrowdsale.sol

/**
 * @title WhitelistedCrowdsale
 * @dev Crowdsale in which only whitelisted users can contribute.
 */
contract WhitelistedCrowdsale is Crowdsale, Ownable {

	mapping(address => bool) public whitelist;

	/**
	* @dev Reverts if beneficiary is not whitelisted. Can be used when extending this contract.
	*/
	modifier isWhitelisted(address _beneficiary) {
		require(whitelist[_beneficiary]);
		_;
	}

	/**
	* @dev Adds single address to whitelist.
	* @param _beneficiary Address to be added to the whitelist
	*/
	function addToWhitelist(address _beneficiary) external onlyOwner {
		whitelist[_beneficiary] = true;
	}

	/**
	* @dev Adds list of addresses to whitelist. Not overloaded due to limitations with truffle testing.
	* @param _beneficiaries Addresses to be added to the whitelist
	*/
	function addManyToWhitelist(address[] _beneficiaries) external onlyOwner {
		for (uint256 i = 0; i < _beneficiaries.length; i++) {
			whitelist[_beneficiaries[i]] = true;
		}
	}

	/**
	* @dev Removes single address from whitelist.
	* @param _beneficiary Address to be removed to the whitelist
	*/
	function removeFromWhitelist(address _beneficiary) external onlyOwner {
		whitelist[_beneficiary] = false;
	}

	/**
	* @dev Extend parent behavior requiring beneficiary to be in whitelist.
	* @param _beneficiary Token beneficiary
	* @param _weiAmount Amount of wei contributed
	*/
	function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal isWhitelisted(_beneficiary) {
		super._preValidatePurchase(_beneficiary, _weiAmount);
	}

}

contract T2TCrowdsale is WhitelistedCrowdsale, AmountLimitCrowdsale, CappedCrowdsale,
TimedCrowdsale, Pausable {
	using SafeMath for uint256;

	uint256 public distributeTime;
	mapping(address => uint256) public balances;

	function T2TCrowdsale(uint256 rate, 
		uint256 openTime, 
		uint256 closeTime, 
		uint256 totalCap,
		uint256 userMin,
		uint256 userMax,
		uint256 _distributeTime,
		address account,
		StandardToken token)
		Crowdsale(rate, account, token)
		TimedCrowdsale(openTime, closeTime)
		CappedCrowdsale(totalCap)
		AmountLimitCrowdsale(userMin, userMax) public {
	  distributeTime = _distributeTime;
	}

	function withdrawTokens(address _beneficiary) public {
	  require(block.timestamp > distributeTime);
	  uint256 amount = balances[_beneficiary];
	  require(amount > 0);
	  balances[_beneficiary] = 0;
	  _deliverTokens(_beneficiary, amount);
	}

	function distributeTokens(address[] _beneficiaries) external onlyOwner {
		for (uint256 i = 0; i < _beneficiaries.length; i++) {
			require(block.timestamp > distributeTime);
			address _beneficiary = _beneficiaries[i];
			uint256 amount = balances[_beneficiary];
			if(amount > 0) {
				balances[_beneficiary] = 0;
				_deliverTokens(_beneficiary, amount);
			}
		}
	}

	function returnTokens(address _beneficiary, uint256 amount) external onlyOwner {
		_deliverTokens(_beneficiary, amount);
	}

	function _processPurchase(
	  address _beneficiary,
	  uint256 _tokenAmount
	)
	internal {
	  balances[_beneficiary] = balances[_beneficiary].add(_tokenAmount);
	}

	function buyTokens(address beneficiary) public payable whenNotPaused {
	  super.buyTokens(beneficiary);
	}
}