// Vulnerability label: TD1
pragma solidity ^0.4.21;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 * @notice https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/math/SafeMath.sol
 */
library SafeMath {
  /**
   * SafeMath mul function
   * @dev function for safe multiply
   **/
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }
  
  /**
   * SafeMath div funciotn
   * @dev function for safe devide
   **/
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a / b;
    return c;
  }
  
  /**
   * SafeMath sub function
   * @dev function for safe subtraction
   **/
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }
  
  /**
   * SafeMath add fuction 
   * @dev function for safe addition
   **/
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * @title ERC20Basic
 * @dev Simple version of ERC20 interface
 * @notice https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) public constant returns (uint256);
  function transfer(address to, uint256 value) public  returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
 * @title BasicToken
 * @dev Basic version of Token, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;
  mapping(address => uint256) balances;

  /**
   * BasicToken transfer function
   * @dev transfer token for a specified address
   * @param _to address to transfer to.
   * @param _value amount to be transferred.
   */
  function transfer(address _to, uint256 _value) public returns (bool) {
    //Safemath fnctions will throw if value is invalid
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
   * BasicToken balanceOf function 
   * @dev Gets the balance of the specified address.
   * @param _owner address to get balance of.
   * @return uint256 amount owned by the address.
   */
  function balanceOf(address _owner) public constant returns (uint256 bal) {
    return balances[_owner];
  }
}

/**
 *  @title ERC20 interface
 *  @notice https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public constant 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);
}

/**
 * @title Token
 * @dev Token to meet the ERC20 standard
 * @notice https://github.com/ethereum/EIPs/issues/20
 */
contract Token is ERC20, BasicToken {
  mapping (address => mapping (address => uint256)) allowed;
  
  /**
   * Token transferFrom function
   * @dev Transfer tokens from one address to another
   * @param _from address to send tokens from
   * @param _to address to transfer to
   * @param _value amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    uint256 _allowance = allowed[_from][msg.sender];
    // Safe math functions will throw if value invalid
    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * Token approve function
   * @dev Aprove address to spend amount of tokens
   * @param _spender address to spend the funds.
   * @param _value amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public 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:
    // @notice https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    assert((_value == 0) || (allowed[msg.sender][_spender] == 0));

    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * Token allowance method
   * @dev Ckeck that owners tokens is allowed to send to 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 available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }
}

/**
 * @title Lavevel Token
 * @dev Simple ERC20 Token with standard token functions.
 */
contract LavevelToken is Token {
  string public constant NAME = "Googlier Token";
  string public constant SYMBOL = "GOOGLIER";
  uint256 public constant DECIMALS = 18;

  uint256 public constant INITIAL_SUPPLY = 500000000 * 10**18;

  /**
   * Kimera Token Constructor
   * @dev Create and issue tokens to msg.sender.
   */
  function LavevelToken() public {
    totalSupply = INITIAL_SUPPLY;
    balances[msg.sender] = INITIAL_SUPPLY;
  }
}

/**
 * @title Ownable
 * @dev Ownable has an owner address to simplify "user permissions".
 */
contract Ownable {
  address public owner;

  /**
   * Ownable
   * @dev Ownable constructor sets the `owner` of the contract to sender
   */
  function Ownable() public {
    owner = msg.sender;
  }

  /**
   * ownerOnly
   * @dev Throws an error if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * transferOwnership
   * @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));
    owner = newOwner;
  }
}

/**
 * @title Token
 * @dev API interface for interacting with the WILD Token contract 
 */

/**
 * @title LavevelICO
 * @dev LavevelICO contract is Ownable
 **/
contract LavevelICO is Ownable {
  using SafeMath for uint256;
  Token token;

  uint256 public constant RATE = 3000; // Number of tokens per Ether
  uint256 public constant CAP = 5350; // Cap in Ether
  uint256 public constant START = 1519862400; // Mar 26, 2018 @ 12:00 EST
  uint256 public constant DAYS = 45; // 45 Day
  
  uint256 public constant initialTokens = 6000000 * 10**18; // Initial number of tokens available
  bool public initialized = false;
  uint256 public raisedAmount = 0;
  
  /**
   * BoughtTokens
   * @dev Log tokens bought onto the blockchain
   */
  event BoughtTokens(address indexed to, uint256 value);

  /**
   * whenSaleIsActive
   * @dev ensures that the contract is still active
   **/
  modifier whenSaleIsActive() {
    // Check if sale is active
    assert(isActive());
    _;
  }
  
  /**
   * LavevelICO
   * @dev LavevelICO constructor
   **/
  function LavevelICO(address _tokenAddr) public {
      require(_tokenAddr != 0);
      token = Token(_tokenAddr);
  }
  
  /**
   * initialize
   * @dev Initialize the contract
   **/
  function initialize() public onlyOwner {
      require(initialized == true); // Can only be initialized once
      require(tokensAvailable() == initialTokens); // Must have enough tokens allocated
      initialized = true;
  }

  /**
   * isActive
   * @dev Determins if the contract is still active
   **/
  function isActive() public view returns (bool) {
    return (
        initialized == true &&
        now >= START && // Must be after the START date
        now <= START.add(DAYS * 1 days) && // Must be before the end date
        goalReached() == false // Goal must not already be reached
    );
  }

  /**
   * goalReached
   * @dev Function to determin is goal has been reached
   **/
  function goalReached() public view returns (bool) {
    return (raisedAmount >= CAP * 1 ether);
  }

  /**
   * @dev Fallback function if ether is sent to address insted of buyTokens function
   **/
  function () public payable {
    buyTokens();
  }

  /**
   * buyTokens
   * @dev function that sells available tokens
   **/
  function buyTokens() public payable whenSaleIsActive {
    uint256 weiAmount = msg.value; // Calculate tokens to sell
    uint256 tokens = weiAmount.mul(RATE);
    
    emit BoughtTokens(msg.sender, tokens); // log event onto the blockchain
    raisedAmount = raisedAmount.add(msg.value); // Increment raised amount
    token.transfer(msg.sender, tokens); // Send tokens to buyer
    
    owner.transfer(msg.value);// Send money to owner
  }

  /**
   * tokensAvailable
   * @dev returns the number of tokens allocated to this contract
   **/
  function tokensAvailable() public constant returns (uint256) {
    return token.balanceOf(this);
  }

  /**
   * destroy
   * @notice Terminate contract and refund to owner
   **/
  function destroy() onlyOwner public {
    // Transfer tokens back to owner
    uint256 balance = token.balanceOf(this);
    assert(balance > 0);
    token.transfer(owner, balance);
    // There should be no ether in the contract but just in case
    selfdestruct(owner);
  }
}