// Vulnerability label: TD1
pragma solidity ^0.4.21;

//-----------------------------------------
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;
  }

}
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  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;
  }

  /**
  * @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 c;
  }

  /**
  * @dev Substracts 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) {
    uint256 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 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]);

    // SafeMath.sub will throw if there is not enough balance.
    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 balance) {
    return balances[_owner];
  }

}
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 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;
  }

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

  bool public mintingFinished = false;


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

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  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;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}
contract BurnableToken is MintableToken {

  event Burn(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public {
    require(_value <= balances[msg.sender]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    address burner = msg.sender;
    balances[burner] = balances[burner].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(burner, _value);
    emit Transfer(burner, address(0), _value);
  }
}

contract PPToken is BurnableToken{
    using SafeMath for uint256;
    
    string public constant name = "PayPortalToken";
    
    string public constant symbol = "PPTL";
    
    uint32 public constant decimals = 18;
    
    uint256 public freezTime;
    
    address internal saleAgent;
    
    mapping(address => uint256) preSaleBalances;
    
    event PreSaleTransfer(address indexed from, address indexed to, uint256 value);
    
    
    function PPToken(uint256 initialSupply, uint256 _freezTime) public{
        require(initialSupply > 0 && now <= _freezTime);
        totalSupply_ = initialSupply * 10 ** uint256(decimals);
        balances[owner] = totalSupply_;
        emit Mint(owner, totalSupply_);
        emit Transfer(0x0, owner, totalSupply_);
        freezTime = _freezTime;
        saleAgent = owner;
    }
    /*
    function PPToken() public{
        uint256 initialSupply = 20000;
        uint256 _freezTime = now + (10 minutes);
        
        require(initialSupply > 0 && now <= _freezTime);
        totalSupply_ = initialSupply * 10 ** uint256(decimals);
        balances[owner] = totalSupply_;
        emit Mint(owner, totalSupply_);
        emit Transfer(0x0, owner, totalSupply_);
        freezTime = _freezTime;
        saleAgent = owner;
    }
    */
    modifier onlySaleAgent() {
        require(msg.sender == saleAgent);
        _;
    }
    
    function burnRemain() public onlySaleAgent {
        uint256 _remSupply = balances[owner];
        balances[owner] = 0;
        totalSupply_ = totalSupply_.sub(_remSupply);

        emit Burn(owner, _remSupply);
        emit Transfer(owner, address(0), _remSupply);
        
        mintingFinished = true;
        emit MintFinished();
    }
    
    function setSaleAgent(address _saleAgent) public onlyOwner{
        require(_saleAgent != address(0));
        saleAgent = _saleAgent;
    }
    function setFreezTime(uint256 _freezTime) public onlyOwner{
        freezTime = _freezTime;
    }
    function saleTokens(address _to, uint256 _value) public onlySaleAgent returns (bool)
    {
        require(_to != address(0));
        require(_value <= balances[owner]);
    
        // SafeMath.sub will throw if there is not enough balance.
        balances[owner] = balances[owner].sub(_value);
        
        if(now > freezTime){
            balances[_to] = balances[_to].add(_value);
        }
        else{
            preSaleBalances[_to] = preSaleBalances[_to].add(_value);
        }
        emit Transfer(msg.sender, _to, _value);
        return true;
    }
    
    function preSaleBalancesOf(address _owner) public view returns (uint256)
    {
        return preSaleBalances[_owner];
    }
    
    function transferPreSaleBalance(address _to, uint256 _value)public returns (bool){
        require(now > freezTime);
        require(_to != address(0));
        require(_value <= preSaleBalances[msg.sender]);
        preSaleBalances[msg.sender] = preSaleBalances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }
}
//-----------------------------------------

contract Crowdsale {
  using SafeMath for uint256;

  // The token being sold
  PPToken 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, PPToken _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 totalTokens = _getTokenAmount(weiAmount);

    // update state
    weiRaised = weiRaised.add(weiAmount);

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

    _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
  {}

  /**
   * @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
  {}

  /**
   * @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 returns (uint256)
  {
      uint256 tokens = _weiAmount.mul(rate);
      return tokens;
  }
  /**
   * @dev Determines how ETH is stored/forwarded on purchases.
   */
  function _forwardFunds() internal {
    wallet.transfer(msg.value);
  }
}
contract AllowanceCrowdsale is Crowdsale {
  using SafeMath for uint256;

  address public tokenWallet;

  /**
   * @dev Constructor, takes token wallet address. 
   * @param _tokenWallet Address holding the tokens, which has approved allowance to the crowdsale
   */
  function AllowanceCrowdsale(address _tokenWallet) public {
    require(_tokenWallet != address(0));
    tokenWallet = _tokenWallet;
  }

  /**
   * @dev Checks the amount of tokens left in the allowance.
   * @return Amount of tokens left in the allowance
   */
  function remainingTokens() public view returns (uint256) {
    return token.balanceOf(tokenWallet);
  }

  /**
   * @dev Overrides parent behavior by transferring tokens from wallet.
   * @param _beneficiary Token purchaser
   * @param _tokenAmount Amount of tokens purchased
   */
  function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
    token.saleTokens(_beneficiary, _tokenAmount);
  }
}
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(!capReached());
    //require(weiRaised.add(_weiAmount) <= cap);
  }

}
contract TimedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public openingTime;
  uint256 public closingTime;

  /**
   * @dev Reverts if not in crowdsale time range. 
   */
  modifier onlyWhileOpen {
    require(now >= openingTime && now <= 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 {
    require(_openingTime >= now);
    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) {
    return now > 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);
  }

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

  bool public isFinalized = false;

  event Finalized();

  /**
   * @dev Must be called after crowdsale ends, to do some extra finalization
   * work. Calls the contract's finalization function.
   */
  function finalize() onlyOwner public {
    require(!isFinalized);
    require(hasClosed());

    finalization();
    emit Finalized();

    isFinalized = true;
  }

  /**
   * @dev Can be overridden to add finalization logic. The overriding function
   * should call super.finalization() to ensure the chain of finalization is
   * executed entirely.
   */
  function finalization() internal
  {
      
  }
}
contract WhitelistedCrowdsale is Crowdsale, Ownable {

  mapping(address => bool) public whitelist;
  //@dev this addres that allow add or remove adresses to whiteList.
  address whiteListAgent;
  
  //@dev set to whiteListAgent address
  function setWhiteListAgent(address _agent) public onlyOwner{
      require(_agent != address(0));
      whiteListAgent = _agent;
  }
  //@dev revert if sender is whiteListAgent
    modifier OnlyWhiteListAgent() {
        require(msg.sender == whiteListAgent);
        _;
    }
  /**
   * @dev Reverts if beneficiary is not whitelisted. Can be used when extending this contract.
   */
  modifier isWhitelisted(address _beneficiary) {
    require(whitelist[_beneficiary]);
    _;
  }
  
  function inWhiteList(address _beneficiary) public view returns(bool){
      return whitelist[_beneficiary];
  }

  /**
   * @dev Adds single address to whitelist.
   * @param _beneficiary Address to be added to the whitelist
   */
  function addToWhitelist(address _beneficiary) external OnlyWhiteListAgent {
    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 OnlyWhiteListAgent {
    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 OnlyWhiteListAgent {
    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 PPTL_PrivateCrowdsale is  FinalizableCrowdsale, CappedCrowdsale, WhitelistedCrowdsale, AllowanceCrowdsale{
    using SafeMath for uint256;
    
    uint256 public bonusPercent;
    uint256 public minWeiAmount;
    
    /*
    function PPTokenCrowdsale(uint256 _openingTime, uint256 _closingTime, uint256 _rate, address _wallet, uint256 _cap, PPToken _token, uint256 _goal
    , address _bountyWallet, uint256 _bountyPercent, address _teamWallet, uint256 _teamPercent) public
        Crowdsale(_rate, _wallet, _token)
        CappedCrowdsale(_cap)
        TimedCrowdsale(_openingTime, _closingTime)
        RefundableCrowdsale(_goal)
      {
        //As goal needs to be met for a successful crowdsale
        //the value needs to less or equal than a cap which is limit for accepted funds
        require(_goal <= _cap);
        bountyWallet = _bountyWallet;
        bountyPercent = _bountyPercent;
        teamWallet = _teamWallet;
        teamPercent = _teamPercent;
        pptoken = _token;
      }
    */
    function PPTL_PrivateCrowdsale( PPToken _token) public
        Crowdsale(500, msg.sender, _token)//(_rate, _wallet, _token)
        CappedCrowdsale((4000 ether))
        TimedCrowdsale(1523836800, 1525564800)//(16 Apr 2018, 06 May 2018)
        AllowanceCrowdsale(msg.sender)
      {
        bonusPercent = 30;
        minWeiAmount = 100 ether;
      }
      
      function finalization() internal
      {
          wallet.transfer(this.balance);
          super.finalization();
      }
      //@dev override for get eth only after finalization
      function _forwardFunds() internal {
            
      }
      function _getTokenAmount(uint256 _weiAmount) internal returns (uint256) {
        uint256 tokens = super._getTokenAmount(_weiAmount);
        uint256 bonus = tokens.mul(bonusPercent).div(100);
        
        tokens = tokens.add(bonus);
        return tokens;
    }
    
    function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal {
        super._preValidatePurchase(_beneficiary, _weiAmount);
        require(_weiAmount >= minWeiAmount);
    }
      
    
}