/**
 * @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 private _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() internal {
    _owner = msg.sender;
    emit OwnershipTransferred(address(0), _owner);
  }

  /**
   * @return the address of the owner.
   */
  function owner() public view returns(address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(isOwner());
    _;
  }

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @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;
  }
}


contract Whitelisted is Ownable {

    mapping (address => uint8) public whitelist;
    mapping (address => bool) public provider;

    // Only whitelisted
    modifier onlyWhitelisted {
      require(isWhitelisted(msg.sender));
      _;
    }

      modifier onlyProvider {
        require(isProvider(msg.sender));
        _;
      }

      // Check if address is KYC provider
      function isProvider(address _provider) public view returns (bool){
        if (owner() == _provider){
          return true;
        }
        return provider[_provider] == true ? true : false;
      }
      // Set new provider
      function setProvider(address _provider) public onlyOwner {
         provider[_provider] = true;
      }
      // Deactive current provider
      function deactivateProvider(address _provider) public onlyOwner {
         require(provider[_provider] == true);
         provider[_provider] = false;
      }
      // Set purchaser to whitelist with zone code
      function setWhitelisted(address _purchaser, uint8 _zone) public onlyProvider {
         whitelist[_purchaser] = _zone;
      }
      // Delete purchaser from whitelist
      function deleteFromWhitelist(address _purchaser) public onlyProvider {
         whitelist[_purchaser] = 0;
      }
      // Get purchaser zone code
      function getWhitelistedZone(address _purchaser) public view returns(uint8) {
        return whitelist[_purchaser] > 0 ? whitelist[_purchaser] : 0;
      }
      // Check if purchaser is whitelisted : return true or false
      function isWhitelisted(address _purchaser) public view returns (bool){
        return whitelist[_purchaser] > 0;
      }
}


/**
 * @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 thanminuend).
  */
  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;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

/**
 * @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 {

  using SafeMath for uint256;

  function safeTransfer(
    IERC20 token,
    address to,
    uint256 value
  )
    internal
  {
    require(token.transfer(to, value));
  }

  function safeTransferFrom(
    IERC20 token,
    address from,
    address to,
    uint256 value
  )
    internal
  {
    require(token.transferFrom(from, to, value));
  }

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  )
    internal
  {
    // safeApprove should only be called when setting an initial allowance,
    // or when resetting it to zero. To increase and decrease it, use
    // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
    require((value == 0) || (token.allowance(msg.sender, spender) == 0));
    require(token.approve(spender, value));
  }

  function safeIncreaseAllowance(
    IERC20 token,
    address spender,
    uint256 value
  )
    internal
  {
    uint256 newAllowance = token.allowance(address(this), spender).add(value);
    require(token.approve(spender, newAllowance));
  }

  function safeDecreaseAllowance(
    IERC20 token,
    address spender,
    uint256 value
  )
    internal
  {
    uint256 newAllowance = token.allowance(address(this), spender).sub(value);
    require(token.approve(spender, newAllowance));
  }
}


/**
 * @title Helps contracts guard against reentrancy attacks.
 * @author Remco Bloemen <remco@2π.com>, Eenae <alexey@mixbytes.io>
 * @dev If you mark a function `nonReentrant`, you should also
 * mark it `external`.
 */
contract ReentrancyGuard {

  /// @dev counter to allow mutex lock with only one SSTORE operation
  uint256 private _guardCounter;

  constructor() internal {
    // The counter starts at one to prevent changing it from zero to a non-zero
    // value, which is a more expensive operation.
    _guardCounter = 1;
  }

  /**
   * @dev Prevents a contract from calling itself, directly or indirectly.
   * Calling a `nonReentrant` function from another `nonReentrant`
   * function is not supported. It is possible to prevent this from happening
   * by making the `nonReentrant` function external, and make it call a
   * `private` function that does the actual work.
   */
  modifier nonReentrant() {
    _guardCounter += 1;
    uint256 localCounter = _guardCounter;
    _;
    require(localCounter == _guardCounter);
  }

}


/**
 * @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 / overridden.
 * The internal interface conforms the extensible and modifiable surface of crowdsales.Override
 * the methods to add functionality. Consider using 'super' where appropriate to concatenate
 * behavior.
 */
contract Crowdsale is ReentrancyGuard {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  // The token being sold
  IERC20 private _token;

  // Address where funds are collected
  address private _wallet;

  // How many token units a buyer gets per wei.
  // The rate is the conversion between wei and the smallest and indivisible token unit.
  // So, if you are using a rate of 1 with a ERC20Detailed token with 3 decimals calledTOK
  // 1 wei will give you 1 unit, or 0.001 TOK.
  uint256 private _rate;

  // Amount of wei raised
  uint256 private _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 TokensPurchased(
    address indexed purchaser,
    address indexed beneficiary,
    uint256 value,
    uint256 amount
  );

  /**
   * @param rate Number of token units a buyer gets per wei
   * @dev The rate is the conversion between wei and the smallest and indivisible
   * token unit. So, if you are using a rate of 1 with a ERC20Detailed token
   * with 3 decimals called TOK, 1 wei will give you 1 unit, or 0.001 TOK.
   * @param wallet Address where collected funds will be forwarded to
   * @param token Address of the token being sold
   */
  constructor(uint256 rate, address wallet, IERC20 token) internal {
    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***
   * Note that other contracts will transfer fund with a base gas stipend
   * of 2300, which is not enough to call buyTokens. Consider calling
   * buyTokens directly when purchasing tokens from a contract.
   */
  function () external payable {
    buyTokens(msg.sender);
  }

  /**
   * @return the token being sold.
   */
  function token() public view returns(IERC20) {
    return _token;
  }

  /**
   * @return the address where funds are collected.
   */
  function wallet() public view returns(address) {
    return _wallet;
  }

  /**
   * @return the number of token units a buyer gets per wei.
   */
  function rate() public view returns(uint256) {
    return _rate;
  }

  /**
   * @return the amount of wei raised.
   */
  function weiRaised() public view returns (uint256) {
    return _weiRaised;
  }

  /**
   * @dev low level token purchase ***DO NOT OVERRIDE***
   * This function has a non-reentrancy guard, so it shouldn't be called by
   * another `nonReentrant` function.
   * @param beneficiary Recipient of the token purchase
   */
  function buyTokens(address beneficiary) public nonReentrant 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 TokensPurchased(
      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` in contracts that inherit from Crowdsale to extend their validations.
   * Example from CappedCrowdsale.sol's _preValidatePurchase method:
   *   super._preValidatePurchase(beneficiary, weiAmount);
   *   require(weiRaised().add(weiAmount) <= cap);
   * @param beneficiary Address performing the token purchase
   * @param weiAmount Value in wei involved in the purchase
   */
  function _preValidatePurchase(
    address beneficiary,
    uint256 weiAmount
  )
    internal
    view
  {
    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
    view
  {
    // 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.safeTransfer(beneficiary, tokenAmount);
  }

  /**
   * @dev Executed when a purchase has been validated and is ready to be executed. Doesn't necessarily emit/send 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(_rate);
  }

  /**
   * @dev Determines how ETH is stored/forwarded on purchases.
   */
  function _forwardFunds() internal {
    _wallet.transfer(msg.value);
  }
}


/**
 * @title TimedCrowdsale
 * @dev Crowdsale accepting contributions only within a time frame.
 */
contract TimedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 private _openingTime;
  uint256 private _closingTime;

  /**
   * @dev Reverts if not in crowdsale time range.
   */
  modifier onlyWhileOpen {
    require(isOpen());
    _;
  }

  /**
   * @dev Constructor, takes crowdsale opening and closing times.
   * @param openingTime Crowdsale opening time
   * @param closingTime Crowdsale closing time
   */
  constructor(uint256 openingTime, uint256 closingTime) internal {
    // solium-disable-next-line security/no-block-members
    require(openingTime >= block.timestamp);
    require(closingTime > openingTime);

    _openingTime = openingTime;
    _closingTime = closingTime;
  }

  /**
   * @return the crowdsale opening time.
   */
  function openingTime() public view returns(uint256) {
    return _openingTime;
  }

  /**
   * @return the crowdsale closing time.
   */
  function closingTime() public view returns(uint256) {
    return _closingTime;
  }

  /**
   * @return true if the crowdsale is open, false otherwise.
   */
  function isOpen() public view returns (bool) {
    // solium-disable-next-line security/no-block-members
    return block.timestamp >= _openingTime && block.timestamp <= _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
    view
  {
    super._preValidatePurchase(beneficiary, weiAmount);
  }

}


/**
 * @title PostDeliveryCrowdsale
 * @dev Crowdsale that locks tokens from withdrawal until it ends.
 */
contract PostDeliveryCrowdsale is TimedCrowdsale {
  using SafeMath for uint256;

  mapping(address => uint256) private _balances;

  constructor() internal {}

  /**
   * @dev Withdraw tokens only after crowdsale ends.
   * @param beneficiary Whose tokens will be withdrawn.
   */
  function withdrawTokens(address beneficiary) public {
    require(hasClosed());
    uint256 amount = _balances[beneficiary];
    require(amount > 0);
    _balances[beneficiary] = 0;
    _deliverTokens(beneficiary, amount);
  }

  /**
   * @return the balance of an account.
   */
  function balanceOf(address account) public view returns(uint256) {
    return _balances[account];
  }

  /**
   * @dev Overrides parent by storing balances instead of issuing tokens right away.
   * @param beneficiary Token purchaser
   * @param tokenAmount Amount of tokens purchased
   */
  function _processPurchase(
    address beneficiary,
    uint256 tokenAmount
  )
    internal
  {
    _balances[beneficiary] = _balances[beneficiary].add(tokenAmount);
  }

}

// File: openzeppelin-solidity/contracts/math/Math.sol

/**
 * @title Math
 * @dev Assorted math operations
 */
library Math {
  /**
  * @dev Returns the largest of two numbers.
  */
  function max(uint256 a, uint256 b) internal pure returns (uint256) {
    return a >= b ? a : b;
  }

  /**
  * @dev Returns the smallest of two numbers.
  */
  function min(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }

  /**
  * @dev Calculates the average of two numbers. Since these are integers,
  * averages of an even and odd number cannot be represented, and will be
  * rounded down.
  */
  function average(uint256 a, uint256 b) internal pure returns (uint256) {
    // (a + b) / 2 can overflow, so we distribute
    return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
  }
}

/**
 * @title AllowanceCrowdsale
 * @dev Extension of Crowdsale where tokens are held by a wallet, which approves an allowance to the crowdsale.
 */
contract AllowanceCrowdsale is Crowdsale {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  address private _tokenWallet;

  /**
   * @dev Constructor, takes token wallet address.
   * @param tokenWallet Address holding the tokens, which has approved allowance to thecrowdsale
   */
  constructor(address tokenWallet) internal {
    require(tokenWallet != address(0));
    _tokenWallet = tokenWallet;
  }

  /**
   * @return the address of the wallet that will hold the tokens.
   */
  function tokenWallet() public view returns(address) {
    return _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 Math.min(
      token().balanceOf(_tokenWallet),
      token().allowance(_tokenWallet, this)
    );
  }

  /**
   * @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().safeTransferFrom(_tokenWallet, beneficiary, tokenAmount);
  }
}


contract MocoCrowdsale is TimedCrowdsale, AllowanceCrowdsale, Whitelisted {
  // Amount of wei raised

  uint256 public bonusPeriod;

  uint256 public bonusAmount;
  // Unlock period 1 - 6 month
  uint256 private _unlock1;

  // Unlock period 2 - 12 month
  uint256 private _unlock2;

  // Specify locked zone for 2nd period
  uint8 private _lockedZone;

  // Total tokens distributed
  uint256 private _totalTokensDistributed;


  // Total tokens locked
  uint256 private _totalTokensLocked;


  event TokensPurchased(
    address indexed purchaser,
    address indexed beneficiary,
    address asset,
    uint256 value,
    uint256 amount
  );

  struct Asset {
    uint256 weiRaised;
    uint256 minAmount;
    uint256 rate;
    bool active;
  }

  mapping (address => Asset) private asset;
  mapping(address => uint256) private _balances;


  constructor(
    uint256 _openingTime,
    uint256 _closingTime,
    uint256 _unlockPeriod1,
    uint256 _unlockPeriod2,
    uint256 _bonusPeriodEnd,
    uint256 _bonusAmount,
    uint256 _rate,
    address _wallet,
    IERC20 _token,
    address _tokenWallet
  ) public
  TimedCrowdsale(_openingTime, _closingTime)
  Crowdsale(_rate, _wallet, _token)
  AllowanceCrowdsale(_tokenWallet){
       _unlock1 = _unlockPeriod1;
       _unlock2 = _unlockPeriod2;
       bonusPeriod = _bonusPeriodEnd;
      bonusAmount  = _bonusAmount;
      asset[0x0].rate  = _rate;
  }
  function getAssetRaised(address _assetAddress) public view returns(uint256) {
      return asset[_assetAddress].weiRaised;
  }
  function getAssetMinAmount(address _assetAddress) public view returns(uint256) {
      return asset[_assetAddress].minAmount;
  }
  function getAssetRate(address _assetAddress) public view returns(uint256) {
      return asset[_assetAddress].rate;
  }
  function isAssetActive(address _assetAddress) public view returns(bool) {
      return asset[_assetAddress].active == true ? true : false;
  }
  // Add asset
  function setAsset(address _assetAddress, uint256 _weiRaised, uint256 _minAmount, uint256 _rate) public onlyOwner {
      asset[_assetAddress].weiRaised = _weiRaised;
      asset[_assetAddress].minAmount = _minAmount;
      asset[_assetAddress].rate = _rate;
      asset[_assetAddress].active = true;
  }

  //

  function weiRaised(address _asset) public view returns (uint256) {
    return asset[_asset].weiRaised;
  }
  function _getTokenAmount(uint256 weiAmount, address asst)
    internal view returns (uint256)
  {
    return weiAmount.mul(asset[asst].rate);
  }

  function minAmount(address _asset) public view returns (uint256) {
    return asset[_asset].minAmount;
  }

  // Buy Tokens
  function buyTokens(address beneficiary) public onlyWhitelisted payable {
    uint256 weiAmount = msg.value;
    _preValidatePurchase(beneficiary, weiAmount, 0x0);

    // calculate token amount to be created
    uint256 tokens = _getTokenAmount(weiAmount, 0x0);

    // update state
    asset[0x0].weiRaised = asset[0x0].weiRaised.add(weiAmount);

    _processPurchase(beneficiary, tokens);

    emit TokensPurchased(
      msg.sender,
      beneficiary,
      0x0,
      weiAmount,
      tokens
    );

    // super._updatePurchasingState(beneficiary, weiAmount);

    super._forwardFunds();
    // super._postValidatePurchase(beneficiary, weiAmount);
  }
  // Buy tokens for assets
  function buyTokensAsset(address beneficiary, address asst, uint256 amount) public onlyWhitelisted {
     require(isAssetActive(asst));
    _preValidatePurchase(beneficiary, amount, asst);

    // calculate token amount to be created
    uint256 tokens = _getTokenAmount(amount, asst);

    // update state
    asset[asst].weiRaised = asset[asst].weiRaised.add(amount);

    _processPurchase(beneficiary, tokens);

    emit TokensPurchased(
      msg.sender,
      beneficiary,
      asst,
      amount,
      tokens
    );

     address _wallet  = wallet();
     IERC20(asst).safeTransferFrom(beneficiary, _wallet, amount);

    // super._postValidatePurchase(beneficiary, weiAmount);
  }

  // Check if locked is end
  function lockedHasEnd() public view returns (bool) {
    return block.timestamp > _unlock1 ? true : false;
  }
  // Check if locked is end
  function lockedTwoHasEnd() public view returns (bool) {
    return block.timestamp > _unlock2 ? true : false;
  }
// Withdraw tokens after locked period is finished
  function withdrawTokens(address beneficiary) public {
    require(lockedHasEnd());
    uint256 amount = _balances[beneficiary];
    require(amount > 0);
    uint256 zone = super.getWhitelistedZone(beneficiary);
    if (zone == 840){
      // require(lockedTwoHasEnd());
      if(lockedTwoHasEnd()){
        _balances[beneficiary] = 0;
        _deliverTokens(beneficiary, amount);
      }
    } else {
    _balances[beneficiary] = 0;
    _deliverTokens(beneficiary, amount);
    }
  }

  // Locked tokens balance
  function balanceOf(address account) public view returns(uint256) {
    return _balances[account];
  }
  // Pre validation token buy
  function _preValidatePurchase(
    address beneficiary,
    uint256 weiAmount,
    address asst
  )
    internal
    view
  {
    require(beneficiary != address(0));
    require(weiAmount != 0);
    require(weiAmount >= minAmount(asst));
}
  function getBonusAmount(uint256 _tokenAmount) public view returns(uint256) {
    return block.timestamp < bonusPeriod ? _tokenAmount.div(bonusAmount) : 0;
  }

  function calculateTokens(uint256 _weiAmount) public view returns(uint256) {
    uint256 tokens  = _getTokenAmount(_weiAmount);
    return  tokens + getBonusAmount(tokens);
  }

  function _processPurchase(
    address beneficiary,
    uint256 tokenAmount
  )
    internal
  {
    uint256 zone = super.getWhitelistedZone(beneficiary);
   uint256 bonusTokens = getBonusAmount(tokenAmount);
    if (zone == 840){
      uint256 totalTokens = bonusTokens.add(tokenAmount);
      _balances[beneficiary] = _balances[beneficiary].add(totalTokens);
    }
    else {
      super._deliverTokens(beneficiary, tokenAmount);
      _balances[beneficiary] = _balances[beneficiary].add(bonusTokens);
    }

  }

}