pragma solidity ^0.4.13;

library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant 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;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract Ownable {
  address public owner;


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    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) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}



contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Transfer(address indexed _from, address indexed _to, uint _value);
  //event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @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) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    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) constant returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  
  // KYBER-NOTE! code changed to comply with ERC20 standard
  event Approval(address indexed _owner, address indexed _spender, uint _value);
  //event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) 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 amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    // KYBER-NOTE! code changed to comply with ERC20 standard
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    //balances[_from] = balances[_from].sub(_value); // this was removed
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));

    allowed[msg.sender][_spender] = _value;
    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 specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

}

contract KyberNetworkCrystal is StandardToken, Ownable {
    string  public  constant name = "Kyber Network Crystal";
    string  public  constant symbol = "KNC";
    uint    public  constant decimals = 18;

    uint    public  saleStartTime;
    uint    public  saleEndTime;

    address public  tokenSaleContract;

    modifier onlyWhenTransferEnabled() {
        if( now <= saleEndTime && now >= saleStartTime ) {
            require( msg.sender == tokenSaleContract );
        }
        _;
    }

    modifier validDestination( address to ) {
        require(to != address(0x0));
        require(to != address(this) );
        _;
    }

    function KyberNetworkCrystal( uint tokenTotalAmount, uint startTime, uint endTime, address admin ) {
        // Mint all tokens. Then disable minting forever.
        balances[msg.sender] = tokenTotalAmount;
        totalSupply = tokenTotalAmount;
        Transfer(address(0x0), msg.sender, tokenTotalAmount);

        saleStartTime = startTime;
        saleEndTime = endTime;

        tokenSaleContract = msg.sender;
        transferOwnership(admin); // admin could drain tokens that were sent here by mistake
    }

    function transfer(address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint _value)
        onlyWhenTransferEnabled
        validDestination(_to)
        returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    event Burn(address indexed _burner, uint _value);

    function burn(uint _value) onlyWhenTransferEnabled
        returns (bool){
        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);
        Burn(msg.sender, _value);
        Transfer(msg.sender, address(0x0), _value);
        return true;
    }

    // save some gas by making only one contract call
    function burnFrom(address _from, uint256 _value) onlyWhenTransferEnabled
        returns (bool) {
        assert( transferFrom( _from, msg.sender, _value ) );
        return burn(_value);
    }

    function emergencyERC20Drain( ERC20 token, uint amount ) onlyOwner {
        token.transfer( owner, amount );
    }
}