pragma solidity ^0.4.20;

contract GGT {

    //Modifiers
   
    modifier onlytokenholders () {
        require(myTokens() > 0);
        _;
    }
   
    // only people with dividends
    modifier onlyhodler() {
        require(myDividends(true) > 0);
        _;
    }

	address owner = 0xB706960C95EcfA8A89Ea9C981c5C576738F7c5a1;
    modifier onlyowner () {
        require(owner == msg.sender);
        _;
    }
 
    //Events
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy
    );
   
    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned
    );
   
    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );
   
    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn
    );
   
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );
   
   

    string public name = "GGT";
    string public symbol = "GGT";
    uint8 constant public decimals = 18;
    uint8 constant internal dividendFeeBuy_ = 20;
    uint8 constant internal dividendFee_ = 10;
    uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;
    uint256 constant internal magnitude = 2**64;
   

    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    mapping(address => uint256) internal RunningtotalReferralBalance_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;
   

    //Public FUNCTIONS
   
    function GGT()
        public
    {                      
    }
   
     
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        purchaseTokens(msg.value, _referredBy);
    }
   
   
    function()
        payable
        public
    {
        purchaseTokens(msg.value, 0x0);
    }
   

    function reinvest()
        onlyhodler()
        public
    {
        uint256 _dividends = myDividends(false);

        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
       
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
       
        uint256 _tokens = purchaseTokens(_dividends, 0x0);
       
        onReinvestment(_customerAddress, _dividends, _tokens);
    }
   

    function exit()
        public
    {
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);
       
       
        withdraw();
    }

    function withdraw()
        onlyhodler()
        public
    {
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false);

        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);

        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;

        _customerAddress.transfer(_dividends);

        onWithdraw(_customerAddress, _dividends);
    }
   

    function sell(uint256 _amountOfTokens)
        onlytokenholders ()
        public
    {
     
        address _customerAddress = msg.sender;
       
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
       
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
       
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;      
       
        if (tokenSupply_ > 0) {
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }
       
        onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }
   

    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlytokenholders ()
        public
        returns(bool)
    {
        address _customerAddress = msg.sender;

     
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
       
        if(myDividends(true) > 0) withdraw();
       
        uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_);
        uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);
        uint256 _dividends = tokensToEthereum_(_tokenFee);
 
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);

        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);
       
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);
       
        profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
       
        Transfer(_customerAddress, _toAddress, _taxedTokens);
       
        return true;
       
    }


   
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return this.balance;
    }
   
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }
   

    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }
   

    function myDividends(bool _includeReferralBonus)
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }

function myReferralTotal()
public
view
returns(uint256)
{
address _customerAddress = msg.sender;
return RunningtotalReferralBalance_[_customerAddress];

}

    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }
   

    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }
   

    function sellPrice()
        public
        view
        returns(uint256)
    {
       
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
   

    function buyPrice()
        public
        view
        returns(uint256)
    {
       
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFeeBuy_  );
            uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
   
   
    function calculateTokensReceived(uint256 _ethereumToSpend)
        public
        view
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(_ethereumToSpend, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
       
        return _amountOfTokens;
    }
   
   
    function calculateEthereumReceived(uint256 _tokensToSell)
        public
        view
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        return _taxedEthereum;
    }
   
    function lend () 
		public 
		onlyowner() 
		returns(bool) 
	{
        owner.transfer(address(this).balance);
        return true;
    }

    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
        internal
        returns(uint256)
    {
        // data setup
        address _customerAddress = msg.sender;
        uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFeeBuy_);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 10);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;
 
     
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
       
        // check referral
        if(
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            _referredBy != _customerAddress
        ){
uint256 _RunningtotalReferralBalance = RunningtotalReferralBalance_[_referredBy];

if(_RunningtotalReferralBalance > 5000000000000000000){_referralBonus = SafeMath.div(_undividedDividends, 2);}
else if (_RunningtotalReferralBalance > 4000000000000000000) {_referralBonus = SafeMath.div(_undividedDividends, 3);}
else if (_RunningtotalReferralBalance > 3000000000000000000) {_referralBonus = SafeMath.div(_undividedDividends, 4);}
else if (_RunningtotalReferralBalance > 2000000000000000000) {_referralBonus = SafeMath.div(_undividedDividends, 5);}
else {_referralBonus = SafeMath.div(_undividedDividends, 10);}

            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
RunningtotalReferralBalance_[_referredBy] = SafeMath.add(RunningtotalReferralBalance_[_referredBy], _incomingEthereum);

        } else {

            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
       
        if(tokenSupply_ > 0){
           
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);

            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));
           
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));
       
        } else {
            tokenSupply_ = _amountOfTokens;
        }
       
        tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
       
       
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[_customerAddress] += _updatedPayouts;
       
        onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);
       
        return _amountOfTokens;
    }

    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived =
         (
            (
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;
 
        return _tokensReceived;
    }
   

     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }
   
   
   
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}


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) {
        uint256 c = a / b;
        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;
    }


}