pragma solidity ^0.4.18;

// File: zeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
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;
  }
}

// File: zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @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 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));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin-solidity/contracts/crowdsale/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: zeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

// File: contracts/MyRefundVault.sol

contract MyRefundVault is RefundVault, Pausable {

  function MyRefundVault(address _wallet) RefundVault(_wallet) 
  {
  }

  function getDeposit(address contributor) public view returns(uint256 depositedValue)
  {
    return deposited[contributor];    
  }

  function refundWhenNotClosed(address contributor) public onlyOwner whenNotPaused returns(uint256 weiRefunded) {
    require(state != State.Closed);
    uint256 depositedValue = deposited[contributor];
    deposited[contributor] = 0;
    uint256 refundFees = depositedValue.div(100);
    uint256 refundValue = depositedValue.sub(refundFees);
    if(refundFees > 0)
      wallet.transfer(refundFees);
    if(refundValue > 0)
      contributor.transfer(refundValue);
    Refunded(contributor, depositedValue);
    return depositedValue;
  }

  function isRefundPaused() public view returns(bool) {
    return paused;
  }

  function myRefund(address investor) public onlyOwner whenNotPaused returns(uint256 refunedValue) {
    require(state == State.Refunding);
    uint256 depositedValue = deposited[investor];
    deposited[investor] = 0;
    investor.transfer(depositedValue);
    Refunded(investor, depositedValue);
    return depositedValue;
  }

}

// File: zeppelin-solidity/contracts/token/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  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);
}

// File: zeppelin-solidity/contracts/token/BasicToken.sol

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
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) 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;
  }

  /**
  * @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];
  }

}

// File: zeppelin-solidity/contracts/token/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
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);
}

// File: zeppelin-solidity/contracts/token/StandardToken.sol

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
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);
    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;
    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);
    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: zeppelin-solidity/contracts/token/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: zeppelin-solidity/contracts/crowdsale/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;
  }

  // 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();
  }


  // 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 = weiAmount.mul(rate);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  // 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;
  }

  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    return now > endTime;
  }


}

// File: zeppelin-solidity/contracts/crowdsale/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/MyRefundableCrowdsale.sol

contract MyRefundableCrowdsale 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
  MyRefundVault public vault;

  function MyRefundableCrowdsale(uint256 _goal) public {
    require(_goal > 0);
    vault = new MyRefundVault(wallet);
    goal = _goal;
  }

  // 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);
  }

  // if crowdsale is unsuccessful, investors can claim refunds here
  function claimRefundOnUnsuccessfulEvent() public {
    require(isFinalized);
    require(!goalReached());
    uint256 refundedValue = vault.myRefund(msg.sender);
    weiRaised = weiRaised.sub(refundedValue);
  }

  // vault finalization task, called when owner calls finalize()
  function finalization() internal {
    if (goalReached()) {
      vault.close();
    } else {
      vault.enableRefunds();
    }

    super.finalization();
  }

  function goalReached() public view returns (bool) {
    return weiRaised >= goal;
  }

  function getDeposit(address contributor) public view returns(uint256 depositedValue) {
    return vault.getDeposit(contributor);
  }

  function pauseRefund() public onlyOwner {
  	vault.pause();
  }

  function unpauseRefund() public onlyOwner {
    vault.unpause();
  }

  function isRefundPaused() public view returns(bool) {
    return vault.isRefundPaused();
  }
}

// File: zeppelin-solidity/contracts/token/BurnableToken.sol

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

    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);
        Burn(burner, _value);
    }
}

// File: contracts/SilcToken.sol

contract SilcToken is MintableToken, BurnableToken {
	string public name = "SILC";
	string public symbol = "SILC";
	uint8 public decimals = 18;

	function burn(address burner, uint256 _value) public onlyOwner {
	    require(_value <= balances[burner]);
	    // 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

	    balances[burner] = balances[burner].sub(_value);
	    totalSupply = totalSupply.sub(_value);
	    Burn(burner, _value);
	}

}

// File: zeppelin-solidity/contracts/crowdsale/CappedCrowdsale.sol

/**
 * @title CappedCrowdsale
 * @dev Extension of Crowdsale with a max amount of funds raised
 */
contract CappedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public cap;

  function CappedCrowdsale(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  // overriding Crowdsale#validPurchase to add extra cap logic
  // @return true if investors can buy at the moment
  function validPurchase() internal view returns (bool) {
    bool withinCap = weiRaised.add(msg.value) <= cap;
    return super.validPurchase() && withinCap;
  }

  // overriding Crowdsale#hasEnded to add cap logic
  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    bool capReached = weiRaised >= cap;
    return super.hasEnded() || capReached;
  }

}

// File: contracts/SilcCrowdsale.sol

contract SilcCrowdsale is CappedCrowdsale, MyRefundableCrowdsale {

  // Sale Stage
  // ============
  enum CrowdsaleStage { phase1, phase2, phase3 }
  CrowdsaleStage public stage = CrowdsaleStage.phase1; // By default it's Pre Sale
  // =============

  // Token Distribution
  // =============================
  uint256 public maxTokens = 20000000000000000000000000000;          // 20,000,000,000
  uint256 public tokensForEcosystem = 3500000000000000000000000000;  //  3,500,000,000
  uint256 public tokensForTeam = 2500000000000000000000000000;       //  2,500,000,000
  uint256 public tokensForAdvisory = 1000000000000000000000000000;   //  1,000,000,000

  uint256 public totalTokensForSale = 3000000000000000000000000000;  // 3,000,000,000 SILC = 30,000 ETH
  // ==============================

  // Rate
  uint256 public rateForPhase1 = 110000;
  uint256 public rateForPhase2 = 105000;
  uint256 public rateForPhase3 = 100000;

  // can be negative, because of refund.
  // ==================
  int256 public totalWeiRaisedDuringPhase1;
  int256 public totalWeiRaisedDuringPhase2;
  int256 public totalWeiRaisedDuringPhase3;
  // ===================

  uint256 public totalTokenSupply;

  // Events
  event EthTransferred(string text);
  event EthRefunded(string text);


  // Constructor
  // ============
  function SilcCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, uint256 _goal, uint256 _cap) 
    CappedCrowdsale(_cap) 
    FinalizableCrowdsale() 
    MyRefundableCrowdsale(_goal) 
    Crowdsale(_startTime, _endTime, _rate, _wallet) public {
      require(_goal <= _cap);
  }
  // =============

  // Token Deployment
  // =================
  function createTokenContract() internal returns (MintableToken) {
    return new SilcToken(); // Deploys the ERC20 token. Automatically called when crowdsale contract is deployed
  }
  // ==================

  // Crowdsale Stage Management
  // =========================================================

  // Change Crowdsale Stage. Available Options: phase1, phase2
  function setCrowdsaleStage(uint value) public onlyOwner {

      CrowdsaleStage _stage;

      if (uint(CrowdsaleStage.phase1) == value) {
        _stage = CrowdsaleStage.phase1;
      } else if (uint(CrowdsaleStage.phase2) == value) {
        _stage = CrowdsaleStage.phase2;
      } else if (uint(CrowdsaleStage.phase3) == value) {
        _stage = CrowdsaleStage.phase3;
      }


      stage = _stage;

      if (stage == CrowdsaleStage.phase1) {
        setCurrentRate(rateForPhase1);
      } else if (stage == CrowdsaleStage.phase2) {
        setCurrentRate(rateForPhase2);
      } else if (stage == CrowdsaleStage.phase3) {
        setCurrentRate(rateForPhase3);
      }
  }

  // Change the current rate
  function setCurrentRate(uint256 _rate) private {
      rate = _rate;
  }

  function calculateWeiForStage(int256 value) {
      if (stage == CrowdsaleStage.phase1) {
        totalWeiRaisedDuringPhase1 = totalWeiRaisedDuringPhase1 + value;
      } else if (stage == CrowdsaleStage.phase2) {
        totalWeiRaisedDuringPhase2 = totalWeiRaisedDuringPhase2 + value;
      } else if (stage == CrowdsaleStage.phase3) {
        totalWeiRaisedDuringPhase3 = totalWeiRaisedDuringPhase3 + value;
      }
  }

  // ================ Stage Management Over =====================

  // Token Purchase
  // =========================
  function () external payable {
      //uint256 tokensThatWillBeMintedAfterPurchase = msg.value.mul(rate);
      //if ((stage == CrowdsaleStage.phase1) && (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > totalTokensForSaleDuringpreSale)) {
      //  msg.sender.transfer(msg.value); // Refund them
      //  EthRefunded("phase1 Limit Hit");
      //  return;
      //}
      require(msg.value >= 0.1 ether); // 0.1 ETH
      buyTokens(msg.sender);
      totalTokenSupply = token.totalSupply();
      calculateWeiForStage(int256(msg.value));
  }

  mapping (address => uint256) tokenIssued;

  function buyTokens(address beneficiary) public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    // calculate token amount to be created
    uint256 tokens = weiAmount.mul(rate);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    tokenIssued[beneficiary] = tokenIssued[beneficiary].add(tokens);

    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  function getTokenIssued(address contributor) public view returns (uint256 token) {
    return tokenIssued[contributor];
  }

  function forwardFunds() internal {
      if (stage == CrowdsaleStage.phase1) {
          //wallet.transfer(msg.value);
          //EthTransferred("forwarding funds to wallet");
          EthTransferred("forwarding funds to refundable vault");
          super.forwardFunds();
      } else if (stage == CrowdsaleStage.phase2) {
          EthTransferred("forwarding funds to refundable vault");
          super.forwardFunds();
      } else if (stage == CrowdsaleStage.phase3) {
          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 _advisoryFund) 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(_advisoryFund,tokensForAdvisory);
    finalize();
  }
  // ===============================

  // token functions
  function mintSilcToken(address _to, uint256 _amount) public onlyOwner {
    token.mint(_to, _amount);
  }

  function transferTokenOwnership(address newOwner) public onlyOwner {
    token.transferOwnership(newOwner);
  }

  function transferVaultOwnership(address newOwner) public onlyOwner {
    vault.transferOwnership(newOwner);
  }
  // ===============================

  event LogEvent(bytes32 message, uint256 value);
  event RefundRequestCompleted(address contributor, uint256 weiRefunded, uint256 burnedToken);
  function refundRequest() public {
    address contributor = msg.sender;
    SilcToken silcToken = SilcToken(address(token));
    uint256 tokenValance = token.balanceOf(contributor);
    require(tokenValance != 0);
    require(tokenValance >= tokenIssued[contributor]);
    //LogEvent("StartBurn", tokenValance);
    silcToken.burn(contributor, tokenIssued[contributor]);  // burn issued tokens
    tokenIssued[contributor] = 0;
    //LogEvent("StartRefund", token.balanceOf(contributor));
    uint256 weiRefunded = vault.refundWhenNotClosed(contributor);
    weiRaised = weiRaised.sub(weiRefunded);

    calculateWeiForStage(int256(weiRefunded) * -1);

    RefundRequestCompleted(contributor, weiRefunded, tokenValance);
  }

  // for testing `finish()` FUNCTION
  function hasEnded() public view returns (bool) {
    return true;
  }
}