/**
*
*
*
* ██████╗░░█████╗░░██╗░░░░░░░██╗███████╗██████╗░//░██████╗████████╗░█████╗░██╗░░██╗███████╗
* ██╔══██╗██╔══██╗░██║░░██╗░░██║██╔════╝██╔══██╗//██╔════╝╚══██╔══╝██╔══██╗██║░██╔╝██╔════╝
* ██████╔╝██║░░██║░╚██╗████╗██╔╝█████╗░░██████╔╝//╚█████╗░░░░██║░░░███████║█████═╝░█████╗░░
* ██╔═══╝░██║░░██║░░████╔═████║░██╔══╝░░██╔══██╗//░╚═══██╗░░░██║░░░██╔══██║██╔═██╗░██╔══╝░░
* ██║░░░░░╚█████╔╝░░╚██╔╝░╚██╔╝░███████╗██║░░██///██████╔╝░░░██║░░░██║░░██║██║░╚██╗███████╗
* ╚═╝░░░░░░╚════╝░░░░╚═╝░░░╚═╝░░╚══════╝╚═╝░░╚═╝//╚═════╝░░░░╚═╝░░░╚═╝░░╚═╝╚═╝░░╚═╝╚══════╝
*
* ░█████╗░░█████╗░███╗░░░███╗███╗░░░███╗██╗░░░██╗███╗░░██╗██╗████████╗██╗░░░██╗
* ██╔══██╗██╔══██╗████╗░████║████╗░████║██║░░░██║████╗░██║██║╚══██╔══╝╚██╗░██╔╝
* ██║░░╚═╝██║░░██║██╔████╔██║██╔████╔██║██║░░░██║██╔██╗██║██║░░░██║░░░░╚████╔╝░
* ██║░░██╗██║░░██║██║╚██╔╝██║██║╚██╔╝██║██║░░░██║██║╚████║██║░░░██║░░░░░╚██╔╝░░
* ╚█████╔╝╚█████╔╝██║░╚═╝░██║██║░╚═╝░██║╚██████╔╝██║░╚███║██║░░░██║░░░░░░██║░░░
* ░╚════╝░░╚════╝░╚═╝░░░░░╚═╝╚═╝░░░░░╚═╝░╚═════╝░╚═╝░░╚══╝╚═╝░░░╚═╝░░░░░░╚═╝░░░
*
* ██████╗░██╗░░░░░░█████╗░████████╗███████╗░█████╗░██████╗░███╗░░░███╗
* ██╔══██╗██║░░░░░██╔══██╗╚══██╔══╝██╔════╝██╔══██╗██╔══██╗████╗░████║
* ██████╔╝██║░░░░░███████║░░░██║░░░█████╗░░██║░░██║██████╔╝██╔████╔██║
* ██╔═══╝░██║░░░░░██╔══██║░░░██║░░░██╔══╝░░██║░░██║██╔══██╗██║╚██╔╝██║
* ██║░░░░░███████╗██║░░██║░░░██║░░░██║░░░░░╚█████╔╝██║░░██║██║░╚═╝░██║
* ╚═╝░░░░░╚══════╝╚═╝░░╚═╝░░░╚═╝░░░╚═╝░░░░░░╚════╝░╚═╝░░╚═╝╚═╝░░░░░╚═╝
* 🌏 A Legacy Platform Built by the Community - for the Community! 🌏
*                     www.powerstake.live
*
*
*
*
* - In late 2017 the Power Stake Community Platform Developer Team sat down with a goal of building a Legacy Earnings Platform 
* - with a Huge, Strong and Positive Community - that will continue for generations. 
* - We wanted to create a Immutable Safe and Secure automated contract and platform that can never be changed or stopped by anyone.
* - A Platform where you don't need to refer a single person to make a Good Steady Passive Income - 
* - but where it's also a chance to make amazingly good extra income by referring others.
* - And perhaps most importantly; - A platform where there is no possibility for developers to run away with everyone's money.
* - A platform that Everyone in the Community can Profit from - 100% Open and Transparent with no Pre-mining.
* 
*
* - The Result is The Power Stake Community Platform and The Power Coin to go with it.
* =====================================================================================*
*
*
* -The Powerstake Community Platform pays all POWER Coin holders 20% dividends through buying/selling volume. 
* -Dividends is paid in Ethereum instantly and proportionally relative to the total POWER circulating supply.
* -Referral link earn you 6% of the total from a new purchase (30% of the 20% generated dividends!)
* -Every time the amount of Ethereum increases on the platform, the value of your POWER Coins increases.
* -The Power Coin will have a price of only 0.0000001 ETH at Launch.
* -You need a minimum of 1 POWER Coin for your referral link to be active.
*
*
* - No need for referrals to earn on the platform!
* - No signup, creating an account, KYC or AML in any way, shape or form!
* - 100% Decentralized!
* - No counterparty risk!
* - No off switch!
* - Open Source - 100% Transparent!
* - No Admin Keys!
* - No Developer Fees!
* - High Dividend Rate!
* - Future Weekly Ethereum Cash Bonuses for all Participants!
* - Immutable contract that can never be changed or stopped!
* - Only one POWER Coin needed to have an Active Referral Link!
* - The Power Stake Community Platform will Always have an active developer and marketing team!
* - Huge Road Map and Future Plans for Side Projects and Partnerships that Will Feed Ethereum into the Community Platform!
* - More Secure than Bitcoin!
*
*
* - Official Website: https://powerstake.live
* - Official Telegram: https://t.me/powerstakingcommunity
* - Official Discord: https://discord.com/invite/P6n8N4grXs
*
* - Not many out there want you to get Rich or Have Huge Success, so if the Community website by any reason is attacked, blocked, removed, 
* - sabotaged or banned at any time in the future, you can always find us by searching for the hashtag #powerstakecommunity
* - There will also be a backup website available to find in the community.
* 
* - Remember if website is down, you can also ALWAYS communicate directly with the community platform contract through etherscan.io
* - You can watch YouTube to find out how to interact directly with a ethereum smart contract on etherscan.io
* - This contract is immutable and can never be stopped, blocked, drained or hacked in any way shape or form!
*
* ====================================*
*
*
* Improvements from original autonomous contract:
* - Fully Decentralized Earnings Platform. Transparent, Open source Ethereum code.
* - More stable than ever, having withstood severe test and mainnet abuse and attack attempts.
* - Audited, tested, and approved by known community security specialists and veteran solidity experts.
* - Testnet iterations have been deployed; with not a single point of failure found.
* - The last over 500 000 (five hundred thousand) test runs/transactions on the Ropsten Test Network have been flawless 
* - and with not a single point of failure found before being deployed on the Ethereum Mainnet.
*
* Still, no guarantees are given - like it is with everything in crypto. 
* Please be careful and double check when interacting with the contract, and never ever give your private keys to anyone!
* 
*/



pragma solidity ^0.4.20;

/*
* Main Net Version
*/

contract PowerStakeCommunity {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with coins
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }
    
    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }
    
    /*==============================
    =            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
    );
    
    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );
    
    
    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "Power Stake Community";
    string public symbol = "POWER";
    uint8 constant public decimals = 18;
    uint8 constant internal dividendFee_ = 5;
    uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;
    uint256 constant internal magnitude = 2**64;


    // proof of stake (defaults at 1 power coin)
    uint256 public stakingRequirement = 1e18;
    
    
   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;


    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --  
    */
    function PowerStakeCommunity()
        public
    {

    }
    
     
    /**
     * Converts all incoming ethereum to coins for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        purchaseTokens(msg.value, _referredBy);
    }
    
    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        purchaseTokens(msg.value, 0x0);
    }
    
    /**
     * Converts all of caller's dividends to coins.
     */
    function reinvest()
        onlyStronghands()
        public
    {
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code
        
        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0);
        
        // fire event
        onReinvestment(_customerAddress, _dividends, _tokens);
    }
    
    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get coin count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);
        
        // retirement time
        withdraw();
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw()
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code
        
        // update dividend tracker
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // retirement time

        _customerAddress.transfer(_dividends);
        
        // fire event
        onWithdraw(_customerAddress, _dividends);
    }
    
    /**
     * Liquifies coins to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        // Remember that Big Brother is always watching.. The Great Eye.. Always watching..
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        
        // burn the sold coins
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
        
        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;       
        
        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per coin
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }
        
        // fire event
        onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }
    
    
    /**
     * Transfer coins from the caller to a new holder.
     * Remember, there's a 10% fee.
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;
        
        // make sure we have the requested coins
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        
        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw();
        
        // liquify 10% of the coins that are transfered
        // these are dispersed to shareholders
        uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_);
        uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);
        uint256 _dividends = tokensToEthereum_(_tokenFee);
  
        // burn the fee coins
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);

        // exchange coins
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);
        
        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);
        
        // disperse dividends among holders
        profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        
        // fire event
        Transfer(_customerAddress, _toAddress, _taxedTokens);
        
        // ERC20
        return true;
       
    }

    
    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return this.balance;
    }
    
    /**
     * Retrieve the total coin supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }
    
    /**
     * Retrieve the coins owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }
    
    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate. 
     */ 
    function myDividends(bool _includeReferralBonus) 
        public 
        view 
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }
    
    /**
     * Retrieve the coin balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }
    
    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }
    
    /**
     * Return the buy price of 1 individual coin.
     */
    function sellPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the coin supply, so we need supply.
        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;
        }
    }
    
    /**
     * Return the sell price of 1 individual coin.
     */
    function buyPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the coin supply, so we need supply.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    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 for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    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;
    }
    
    
    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/
    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
        internal
        returns(uint256)
    {
        // data setup
        address _customerAddress = msg.sender;
        uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFee_);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;
 
        // prevents overflow

         require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
        
        // is the user referred by a referral link?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != _customerAddress &&
            
            // does the referent have at least 1 whole coin?
            // Referent MUST hold coins
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
        
        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){
            
            // add coins to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);
 
            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));
            
            // calculate the amount of coins the customer receives over his purchase 
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));
        
        } else {
            // add coins to the pool
            tokenSupply_ = _amountOfTokens;
        }
        
        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        
        // Tells the contract that the buyer doesn't deserve dividends for the coins before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[_customerAddress] += _updatedPayouts;
        
        // fire event
        onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);
        
        return _amountOfTokens;
    }

    /**
     * Calculate Coin price based on an amount of incoming ethereum
     * It's an algorithm.
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived = 
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;
  
        return _tokensReceived;
    }
    
    /**
     * Calculate coin sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }
    
    
    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    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;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    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;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    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;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

{
  "compilationTarget": {
    "PowerStakeCommunity.sol": "PowerStakeCommunity"
  },
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}