pragma solidity ^0.4.20;
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));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}
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);
}
library SafeMath {
  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;
  }
  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;
  }
  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) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}
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]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }
  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;
  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);
    Transfer(_from, _to, _value);
    return true;
  }
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    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);
    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);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: contracts\MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
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);
    Mint(_to, _amount);
    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;
    MintFinished();
    return true;
  }
}

// File: contracts\Crowdsale.sol

/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale.
 * Crowdsales have a start and end timestamps, where investors can make
 * token purchases and the crowdsale will assign them tokens based
 * on a token per ETH rate. Funds collected are forwarded to a wallet
 * as they arrive.
 */
contract Crowdsale {
  using SafeMath for uint256;

  // The token being sold
  MintableToken public token;

  // start and end timestamps where investments are allowed (both inclusive)
  uint256 public startTime;
  uint256 public endTime;

  // address where funds are collected
  address public wallet;

  // how many token units a buyer gets per wei
  uint256 public rate;

  // amount of raised money in wei
  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);


  function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet) public {
    //require(_startTime >= now);
    require(_endTime >= _startTime);
    require(_rate > 0);
    require(_wallet != address(0));

    token = createTokenContract();
    startTime = _startTime;
    endTime = _endTime;
    rate = _rate;
    wallet = _wallet;
  }

  // fallback function can be used to buy tokens
  function () external payable {
    buyTokens(msg.sender);
  }

  // low level token purchase function
  function buyTokens(address beneficiary) public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    // calculate token amount to be created
    uint256 tokens = getTokenAmount(weiAmount);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    return now > endTime;
  }

  // creates the token to be sold.
  // override this method to have crowdsale of a specific mintable token.
  function createTokenContract() internal returns (MintableToken) {
    return new MintableToken();
  }

  // Override this method to have a way to add business logic to your crowdsale when buying
  function getTokenAmount(uint256 weiAmount) internal view returns(uint256) {
    return weiAmount.mul(rate);
  }

  // send ether to the fund collection wallet
  // override to create custom fund forwarding mechanisms
  function forwardFunds() internal {
    wallet.transfer(msg.value);
  }

  // @return true if the transaction can buy tokens
  function validPurchase() internal view returns (bool) {
    bool withinPeriod = now >= startTime && now <= endTime;
    bool nonZeroPurchase = msg.value != 0;
    return withinPeriod && nonZeroPurchase;
  }

}

contract CappedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public cap;

  function CappedCrowdsale(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }
  function hasEnded() public view returns (bool) {
    bool capReached = weiRaised >= cap;
    return capReached || super.hasEnded();
  }
  function validPurchase() internal view returns (bool) {
    bool withinCap = weiRaised.add(msg.value) <= cap;
    return withinCap && super.validPurchase();
  }

}

contract HAIToken is MintableToken {
  string public name = "HAI Token";
  string public symbol = "HAI";
  uint8 public decimals = 18;
}

// File: contracts\FinalizableCrowdsale.sol

/**
 * @title FinalizableCrowdsale
 * @dev Extension of Crowdsale where an owner can do extra work
 * after finishing.
 */
contract FinalizableCrowdsale is Crowdsale, 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(hasEnded());

    finalization();
    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 {
  }
}

// File: contracts\RefundVault.sol

/**
 * @title RefundVault
 * @dev This contract is used for storing funds while a crowdsale
 * is in progress. Supports refunding the money if crowdsale fails,
 * and forwarding it if crowdsale is successful.
 */
contract RefundVault is Ownable {
  using SafeMath for uint256;

  enum State { Active, Refunding, Closed }

  mapping (address => uint256) public deposited;
  address public wallet;
  State public state;

  event Closed();
  event RefundsEnabled();
  event Refunded(address indexed beneficiary, uint256 weiAmount);

  function RefundVault(address _wallet) public {
    require(_wallet != address(0));
    wallet = _wallet;
    state = State.Active;
  }

  function deposit(address investor) onlyOwner public payable {
    require(state == State.Active);
    deposited[investor] = deposited[investor].add(msg.value);
  }

  function close() onlyOwner public {
    require(state == State.Active);
    state = State.Closed;
    Closed();
    wallet.transfer(this.balance);
  }

  function enableRefunds() onlyOwner public {
    require(state == State.Active);
    state = State.Refunding;
    RefundsEnabled();
  }

  function refund(address investor) public {
    require(state == State.Refunding);
    uint256 depositedValue = deposited[investor];
    deposited[investor] = 0;
    investor.transfer(depositedValue);
    Refunded(investor, depositedValue);
  }
}

// File: contracts\RefundableCrowdsale.sol

/**
 * @title RefundableCrowdsale
 * @dev Extension of Crowdsale contract that adds a funding goal, and
 * the possibility of users getting a refund if goal is not met.
 * Uses a RefundVault as the crowdsale's vault.
 */
contract RefundableCrowdsale is FinalizableCrowdsale {
  using SafeMath for uint256;

  // minimum amount of funds to be raised in weis
  uint256 public goal;

  // refund vault used to hold funds while crowdsale is running
  RefundVault public vault;

  function RefundableCrowdsale(uint256 _goal) public {
    require(_goal > 0);
    vault = new RefundVault(wallet);
    goal = _goal;
  }

  // if crowdsale is unsuccessful, investors can claim refunds here
  /*function claimRefund() public {
    require(isFinalized);
    require(!goalReached());

    vault.refund(msg.sender);
  }
  */

  function goalReached() public view returns (bool) {
    return weiRaised >= goal;
  }

  // vault finalization task, called when owner calls finalize()
  function finalization() internal {
    if (goalReached()) {
      vault.close();
    } else {
      vault.enableRefunds();
    }

    super.finalization();
  }

  // We're overriding the fund forwarding from Crowdsale.
  // In addition to sending the funds, we want to call
  // the RefundVault deposit function
  function forwardFunds() internal {
    vault.deposit.value(msg.value)(msg.sender);
  }

}

// File: contracts\HAICrowdsale.sol

contract HAICrowdsale is CappedCrowdsale, RefundableCrowdsale {

  // ICO Stage
  // ============
  enum CrowdsaleStage { PreICO, ICO }
  CrowdsaleStage public stage = CrowdsaleStage.PreICO;
  // =============

  // Token Distribution
  // =============================
  uint256 public maxTokens = 100000000000000000000000000;
  uint256 public tokensForEcosystem = 5000000000000000000000000;
  uint256 public tokensForTeam = 5000000000000000000000000;
  uint256 public tokensForBounty = 5000000000000000000000000;
  uint256 public totalTokensForSale = 75000000000000000000000000;
  uint256 public totalTokensForSaleDuringPreICO = 10000000000000000000000000;
  // ==============================

  // Amount raised in PreICO
  // ==================
  uint256 public totalWeiRaisedDuringPreICO;
  // ===================


  // Events
  event EthTransferred(string text);
  event EthRefunded(string text);


  // Constructor
  // ============
  function HAICrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, uint256 _goal, uint256 _cap) CappedCrowdsale(_cap) FinalizableCrowdsale() RefundableCrowdsale(_goal) Crowdsale(_startTime, _endTime, _rate, _wallet) public {
      require(_goal <= _cap);
  }
  // =============

  // Token Deployment
  // =================
  function createTokenContract() internal returns (MintableToken) {
    return new HAIToken(); // Deploys the ERC20 token. Automatically called when crowdsale contract is deployed
  }
  // ==================

  // Crowdsale Stage Management
  // =========================================================

  // Change Crowdsale Stage. Available Options: PreICO, ICO
  function setCrowdsaleStage(uint value) public onlyOwner {

      CrowdsaleStage _stage;

      if (uint(CrowdsaleStage.PreICO) == value) {
        _stage = CrowdsaleStage.PreICO;
      } else if (uint(CrowdsaleStage.ICO) == value) {
        _stage = CrowdsaleStage.ICO;
      }

      stage = _stage;

      if (stage == CrowdsaleStage.PreICO) {
        setCurrentRate(2500);
      } else if (stage == CrowdsaleStage.ICO) {
        setCurrentRate(2000);
      }
  }

  // Change the current rate
  function setCurrentRate(uint256 _rate) private {
      rate = _rate;
  }

  // ================ Stage Management Over =====================

  // Token Purchase
  // =========================
  function () external payable {
      uint256 tokensThatWillBeMintedAfterPurchase = msg.value.mul(rate);
      if ((stage == CrowdsaleStage.PreICO) && (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > totalTokensForSaleDuringPreICO)) {
        msg.sender.transfer(msg.value); // Refund them
        EthRefunded("PreICO Limit Hit");
        return;
      }

      buyTokens(msg.sender);

      if (stage == CrowdsaleStage.PreICO) {
          totalWeiRaisedDuringPreICO = totalWeiRaisedDuringPreICO.add(msg.value);
      }
  }

  function forwardFunds() internal {
      if (stage == CrowdsaleStage.PreICO) {
          wallet.transfer(msg.value);
          EthTransferred("forwarding funds to wallet");
      } else if (stage == CrowdsaleStage.ICO) {
          EthTransferred("forwarding funds to refundable vault");
          super.forwardFunds();
      }
  }
  // ===========================

  // Finish: Mint Extra Tokens as needed before finalizing the Crowdsale.
  // ====================================================================

  function finish(address _teamFund, address _ecosystemFund, address _bountyFund) public onlyOwner {

      require(!isFinalized);
      uint256 alreadyMinted = token.totalSupply();
      require(alreadyMinted < maxTokens);
      uint256 unsoldTokens = totalTokensForSale - alreadyMinted;
      if (unsoldTokens > 0) {
        tokensForEcosystem = tokensForEcosystem + unsoldTokens;
      }
      token.mint(_teamFund,tokensForTeam);
      token.mint(_ecosystemFund,tokensForEcosystem);
      token.mint(_bountyFund,tokensForBounty);
      finalize();
  }
}