contract TokenSale is FinalizableCrowdsale, Pausable {
    uint256 public crowdsaleCap;
    uint256 public tokensSold;
    // amount of raised money in STAR
    uint256 public starRaised;
    uint256 public starRate;
    address public initialTokenOwner;
    bool public isWeiAccepted;

    // external contracts
    Whitelist public whitelist;
    ERC20Plus public starToken;
    // The token being sold
    ERC20Plus public tokenOnSale;

    event TokenRateChanged(uint256 previousRate, uint256 newRate);
    event TokenStarRateChanged(uint256 previousStarRate, uint256 newStarRate);
    event TokenPurchaseWithStar(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

    /**
     * @dev initialization function
     * @param _startTime The timestamp of the beginning of the crowdsale
     * @param _endTime Timestamp when the crowdsale will finish
     * @param _whitelist contract containing the whitelisted addresses
     * @param _starToken STAR token contract address
     * @param _companyToken ERC20 contract address that has minting capabilities
     * @param _rate The token rate per ETH
     * @param _starRate The token rate per STAR
     * @param _wallet Multisig wallet that will hold the crowdsale funds.
     * @param _crowdsaleCap Cap for the token sale
     * @param _isWeiAccepted Bool for acceptance of ether in token sale
     */
    function init(
        uint256 _startTime,
        uint256 _endTime,
        address _whitelist,
        address _starToken,
        address _companyToken,
        uint256 _rate,
        uint256 _starRate,
        address _wallet,
        uint256 _crowdsaleCap,
        bool    _isWeiAccepted
    )
        external
    {
        require(
            whitelist == address(0) &&
            starToken == address(0) &&
            rate == 0 &&
            starRate == 0 &&
            tokenOnSale == address(0) &&
            crowdsaleCap == 0,
            "Global variables should not have been set before!"
        );

        require(
            _whitelist != address(0) &&
            _starToken != address(0) &&
            !(_rate == 0 && _starRate == 0) &&
            _companyToken != address(0) &&
            _crowdsaleCap != 0,
            "Parameter variables cannot be empty!"
        );

        if (_isWeiAccepted) {
            require(_rate > 0, "Set a rate for Wei, when it is accepted for purchases!");
        } else {
            require(_rate == 0, "Only set a rate for Wei, when it is accepted for purchases!");
        }

        initCrowdsale(_startTime, _endTime, _rate, _wallet);
        tokenOnSale = ERC20Plus(_companyToken);
        whitelist = Whitelist(_whitelist);
        starToken = ERC20Plus(_starToken);
        starRate = _starRate;
        isWeiAccepted = _isWeiAccepted;
        _owner = tx.origin;

        initialTokenOwner = ERC20Plus(tokenOnSale).owner();
        crowdsaleCap = _crowdsaleCap.mul(10 ** 18);

        require(ERC20Plus(tokenOnSale).paused(), "Company token must be paused upon initialization!");
        require(ERC20Plus(tokenOnSale).decimals() == 18, "Only sales for tokens with 18 decimals are supported!");
    }

    modifier isWhitelisted(address beneficiary) {
        require(whitelist.allowedAddresses(beneficiary), "Beneficiary not whitelisted!");
        _;
    }

    modifier crowdsaleIsTokenOwner() {
        require(tokenOnSale.owner() == address(this), "The token owner must be contract address!");
        _;
    }

    /**
     * @dev override fallback function. cannot use it
     */
    function () external payable {
        revert("No fallback function defined!");
    }

    /**
     * @dev change crowdsale ETH rate
     * @param newRate Figure that corresponds to the new ETH rate per token
     */
    function setRate(uint256 newRate) external onlyOwner {
        require(isWeiAccepted, "Sale must allow Wei for purchases to set a rate for Wei!");
        require(newRate != 0, "ETH rate must be more than 0!");

        emit TokenRateChanged(rate, newRate);
        rate = newRate;
    }

    /**
     * @dev change crowdsale STAR rate
     * @param newStarRate Figure that corresponds to the new STAR rate per token
     */
    function setStarRate(uint256 newStarRate) external onlyOwner {
        require(newStarRate != 0, "Star rate must be more than 0!");

        emit TokenStarRateChanged(starRate, newStarRate);
        starRate = newStarRate;
    }

    /**
     * @dev allows sale to receive wei or not
     */
    function setIsWeiAccepted(bool _isWeiAccepted, uint256 _rate) external onlyOwner {
        if (_isWeiAccepted) {
            require(_rate > 0, "When accepting Wei, you need to set a conversion rate!");
        } else {
            require(_rate == 0, "When not accepting Wei, you need to set a conversion rate of 0!");
        }

        isWeiAccepted = _isWeiAccepted;
        rate = _rate;
    }

    /**
     * @dev function that allows token purchases with STAR
     * @param beneficiary Address of the purchaser
     */
    function buyTokens(address beneficiary)
        public
        payable
        whenNotPaused
        isWhitelisted(beneficiary)
        crowdsaleIsTokenOwner
    {
        require(beneficiary != address(0));
        require(validPurchase() && tokensSold < crowdsaleCap);

        if (!isWeiAccepted) {
            require(msg.value == 0);
        } else if (msg.value > 0) {
            buyTokensWithWei(beneficiary);
        }

        // beneficiary must allow TokenSale address to transfer star tokens on its behalf
        uint256 starAllocationToTokenSale = starToken.allowance(beneficiary, this);
        if (starAllocationToTokenSale > 0) {
            // calculate token amount to be created
            uint256 tokens = starAllocationToTokenSale.mul(starRate);

            //remainder logic
            if (tokensSold.add(tokens) > crowdsaleCap) {
                tokens = crowdsaleCap.sub(tokensSold);

                starAllocationToTokenSale = tokens.div(starRate);
            }

            // update state
            starRaised = starRaised.add(starAllocationToTokenSale);

            tokensSold = tokensSold.add(tokens);
            tokenOnSale.mint(beneficiary, tokens);
            emit TokenPurchaseWithStar(msg.sender, beneficiary, starAllocationToTokenSale, tokens);

            // forward funds
            starToken.transferFrom(beneficiary, wallet, starAllocationToTokenSale);
        }
    }

    /**
     * @dev function that allows token purchases with Wei
     * @param beneficiary Address of the purchaser
     */
    function buyTokensWithWei(address beneficiary)
        internal
    {
        uint256 weiAmount = msg.value;
        uint256 weiRefund = 0;

        // calculate token amount to be created
        uint256 tokens = weiAmount.mul(rate);

        //remainder logic
        if (tokensSold.add(tokens) > crowdsaleCap) {
            tokens = crowdsaleCap.sub(tokensSold);
            weiAmount = tokens.div(rate);

            weiRefund = msg.value.sub(weiAmount);
        }

        // update state
        weiRaised = weiRaised.add(weiAmount);

        tokensSold = tokensSold.add(tokens);
        tokenOnSale.mint(beneficiary, tokens);
        emit TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

        wallet.transfer(weiAmount);
        if (weiRefund > 0) {
            msg.sender.transfer(weiRefund);
        }
    }

    // override Crowdsale#hasEnded to add cap logic
    // @return true if crowdsale event has ended
    function hasEnded() public view returns (bool) {
        if (tokensSold >= crowdsaleCap) {
            return true;
        }

        return super.hasEnded();
    }

    /**
     * @dev override Crowdsale#validPurchase
     * @return true if the transaction can buy tokens
     */
    function validPurchase() internal view returns (bool) {
        return now >= startTime && now <= endTime;
    }

    /**
     * @dev finalizes crowdsale
     */
    function finalization() internal {
        if (crowdsaleCap > tokensSold) {
            uint256 remainingTokens = crowdsaleCap.sub(tokensSold);

            tokenOnSale.mint(wallet, remainingTokens);
        }

        tokenOnSale.transferOwnership(initialTokenOwner);
        super.finalization();
    }
}
/**
 * @title Token Sale contract - crowdsale of company tokens.
 * @author Gustavo Guimaraes - <gustavo@starbase.co>
 */
function setStarRate(uint256 newStarRate) external onlyOwner {
    require(newStarRate != 0, "Star rate must be more than 0!");

    emit TokenStarRateChanged(starRate, newStarRate);
    starRate = newStarRate;
}

/**
 * @dev change crowdsale STAR rate
 * @param newStarRate Figure that corresponds to the new STAR rate per token
 */