pragma solidity ^0.4.21;



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) {
    
    
    
    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 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);
}




contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  
  function Ownable() public {
    owner = msg.sender;
  }

  
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}










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);
}





contract Crowdsale {
  using SafeMath for uint256;

  
  ERC20 public token;

  
  address public wallet;

  
  uint256 public rate;

  
  uint256 public weiRaised;

  
  event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

  
  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;
  }

  
  
  

  
  function () external payable {
    buyTokens(msg.sender);
  }

  
  function buyTokens(address _beneficiary) public payable {

    uint256 weiAmount = msg.value;
    _preValidatePurchase(_beneficiary, weiAmount);

    
    uint256 tokens = _getTokenAmount(weiAmount);

    
    weiRaised = weiRaised.add(weiAmount);

    _processPurchase(_beneficiary, tokens);
    emit TokenPurchase(
      msg.sender,
      _beneficiary,
      weiAmount,
      tokens
    );

    _updatePurchasingState(_beneficiary, weiAmount);

    _forwardFunds();
    _postValidatePurchase(_beneficiary, weiAmount);
  }

  
  
  

  
  function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
    require(_beneficiary != address(0));
    require(_weiAmount != 0);
  }

  
  function _postValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
    
  }

  
  function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
    token.transfer(_beneficiary, _tokenAmount);
  }

  
  function _processPurchase(address _beneficiary, uint256 _tokenAmount) internal {
    _deliverTokens(_beneficiary, _tokenAmount);
  }

  
  function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal {
    
  }

  
  function _getTokenAmount(uint256 _weiAmount) internal view returns (uint256) {
    return _weiAmount.mul(rate);
  }

  
  function _forwardFunds() internal {
    wallet.transfer(msg.value);
  }
}












contract TimedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public openingTime;
  uint256 public closingTime;

  
  modifier onlyWhileOpen {
    
    require(block.timestamp >= openingTime && block.timestamp <= closingTime);
    _;
  }

  
  function TimedCrowdsale(uint256 _openingTime, uint256 _closingTime) public {
    
    require(_openingTime >= block.timestamp);
    require(_closingTime >= _openingTime);

    openingTime = _openingTime;
    closingTime = _closingTime;
  }

  
  function hasClosed() public view returns (bool) {
    
    return block.timestamp > closingTime;
  }

  
  function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal onlyWhileOpen {
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

}




contract FinalizableCrowdsale is TimedCrowdsale, Ownable {
  using SafeMath for uint256;

  bool public isFinalized = false;

  event Finalized();

  
  function finalize() onlyOwner public {
    require(!isFinalized);
    require(hasClosed());

    finalization();
    emit Finalized();

    isFinalized = true;
  }

  
  function finalization() internal {
  }

}








contract CappedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public cap;

  
  function CappedCrowdsale(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  
  function capReached() public view returns (bool) {
    return weiRaised >= cap;
  }

  
  function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
    super._preValidatePurchase(_beneficiary, _weiAmount);
    require(weiRaised.add(_weiAmount) <= cap);
  }

}









contract IndividuallyCappedCrowdsale is Crowdsale, Ownable {
  using SafeMath for uint256;

  mapping(address => uint256) public contributions;
  mapping(address => uint256) public caps;

  
  function setUserCap(address _beneficiary, uint256 _cap) external onlyOwner {
    caps[_beneficiary] = _cap;
  }

  
  function setGroupCap(address[] _beneficiaries, uint256 _cap) external onlyOwner {
    for (uint256 i = 0; i < _beneficiaries.length; i++) {
      caps[_beneficiaries[i]] = _cap;
    }
  }

  
  function getUserCap(address _beneficiary) public view returns (uint256) {
    return caps[_beneficiary];
  }

  
  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) <= caps[_beneficiary]);
  }

  
  function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal {
    super._updatePurchasingState(_beneficiary, _weiAmount);
    contributions[_beneficiary] = contributions[_beneficiary].add(_weiAmount);
  }

}








contract WhitelistedCrowdsale is Crowdsale, Ownable {

  mapping(address => bool) public whitelist;

  
  modifier isWhitelisted(address _beneficiary) {
    require(whitelist[_beneficiary]);
    _;
  }

  
  function addToWhitelist(address _beneficiary) external onlyOwner {
    whitelist[_beneficiary] = true;
  }

  
  function addManyToWhitelist(address[] _beneficiaries) external onlyOwner {
    for (uint256 i = 0; i < _beneficiaries.length; i++) {
      whitelist[_beneficiaries[i]] = true;
    }
  }

  
  function removeFromWhitelist(address _beneficiary) external onlyOwner {
    whitelist[_beneficiary] = false;
  }

  
  function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal isWhitelisted(_beneficiary) {
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

}








contract Destructible is Ownable {

  function Destructible() public payable { }

  
  function destroy() onlyOwner public {
    selfdestruct(owner);
  }

  function destroyAndSend(address _recipient) onlyOwner public {
    selfdestruct(_recipient);
  }
}








contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  
  modifier whenPaused() {
    require(paused);
    _;
  }

  
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }

  
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }
}















contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

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

  
  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;
  }

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

}





contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  
  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;
  }

  
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  
  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;
  }

  
  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;
  }

}





contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


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

  
  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}


contract AAToken is MintableToken{
    string public constant name = "AAToken";
    string public constant symbol = "AAT";
    uint8 public constant decimals = 18;
}


contract AATokenPrivatesale is FinalizableCrowdsale, CappedCrowdsale, IndividuallyCappedCrowdsale, WhitelistedCrowdsale, Destructible, Pausable {
    function AATokenPrivatesale
        (
            uint256 _cap,
            uint256 _openingTime,
            uint256 _closingTime,
            uint256 _rate,
            address _wallet,
            MintableToken _token
        )
        public
        Crowdsale(_rate, _wallet, _token)
        TimedCrowdsale(_openingTime, _closingTime)
        CappedCrowdsale(_cap) {

        }

    function returnRemainingTokens() onlyOwner public {
        require(paused);
        uint256 remaining = token.balanceOf(this);
        token.transfer(owner, remaining);
    }
}