//SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;


library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }
}

/**
 * BEP20 standard interface.
 */
interface IBEP20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address _owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender) ;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * Allows for contract ownership along with multi-address authorization
 */
contract Ownable is Context {
    address private _owner;
    mapping (address => bool) internal authorizations;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _owner = msg.sender;
        authorizations[_owner] = true;
        emit OwnershipTransferred(address(0), _owner);
    }

    function setAuthorize(address adr,bool val) public onlyOwner {
        authorizations[adr] = val;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), 'Ownable: caller is not the owner');
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), 'Ownable: new owner is the zero address');
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

interface IDividendDistributor {
    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external;
    function setShare(address shareholder, uint256 amount) external;
    function deposit() external payable;
    function process(uint256 gas) external;
}

contract DividendDistributor is IDividendDistributor {
    using SafeMath for uint256;

    address _token;

    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
    }

    IBEP20 ETH = IBEP20(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
    address WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    IDEXRouter router;

    address[] shareholders;
    mapping (address => uint256) shareholderIndexes;
    mapping (address => uint256) shareholderClaims;

    mapping (address => Share) public shares;

    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 public dividendsPerShare;
    uint256 public dividendsPerShareAccuracyFactor = 10 ** 36;

    //SETMEUP, change this to 1 hour instead of 10mins
    uint256 public minPeriod = 30 minutes;
    uint256 public minDistribution = 1 * (10 ** 18);

    uint256 currentIndex;

    bool initialized;
    modifier initialization() {
        require(!initialized);
        _;
        initialized = true;
    }

    modifier onlyToken() {
        require(msg.sender == _token); _;
    }

    constructor (address _router) {
        router = _router != address(0)
            ? IDEXRouter(_router)
            : IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); //0x10ED43C718714eb63d5aA57B78B54704E256024E pancake
        _token = msg.sender;
    }

    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external override onlyToken {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
    }

    function setShare(address shareholder, uint256 amount) external override onlyToken {
        if(shares[shareholder].amount > 0){
            distributeDividend(shareholder);
        }

        if(amount > 0 && shares[shareholder].amount == 0){
            addShareholder(shareholder);
        }else if(amount == 0 && shares[shareholder].amount > 0){
            removeShareholder(shareholder);
        }

        totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
        shares[shareholder].amount = amount;
        shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
    }

    function deposit() external payable override onlyToken {
        uint256 balanceBefore = ETH.balanceOf(address(this));

        address[] memory path = new address[](2);
        path[0] = WETH;
        path[1] = address(ETH);

        router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amount = ETH.balanceOf(address(this)).sub(balanceBefore);

        totalDividends = totalDividends.add(amount);
        dividendsPerShare = dividendsPerShare.add(dividendsPerShareAccuracyFactor.mul(amount).div(totalShares));
    }

    function process(uint256 gas) external override onlyToken {
        uint256 shareholderCount = shareholders.length;

        if(shareholderCount == 0) { return; }

        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();

        uint256 iterations = 0;

        while(gasUsed < gas && iterations < shareholderCount) {
            if(currentIndex >= shareholderCount){
                currentIndex = 0;
            }

            if(shouldDistribute(shareholders[currentIndex])){
                distributeDividend(shareholders[currentIndex]);
            }

            gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
            gasLeft = gasleft();
            currentIndex++;
            iterations++;
        }
    }
    
    function shouldDistribute(address shareholder) internal view returns (bool) {
        return shareholderClaims[shareholder] + minPeriod < block.timestamp
                && getUnpaidEarnings(shareholder) > minDistribution;
    }

    function distributeDividend(address shareholder) internal {
        if(shares[shareholder].amount == 0){ return; }

        uint256 amount = getUnpaidEarnings(shareholder);
        if(amount > 0){
            totalDistributed = totalDistributed.add(amount);
            ETH.transfer(shareholder, amount);
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount);
            shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
        }
    }
    
    function claimDividend() external {
        distributeDividend(msg.sender);
    }

    function getUnpaidEarnings(address shareholder) public view returns (uint256) {
        if(shares[shareholder].amount == 0){ return 0; }

        uint256 shareholderTotalDividends = getCumulativeDividends(shares[shareholder].amount);
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;

        if(shareholderTotalDividends <= shareholderTotalExcluded){ return 0; }

        return shareholderTotalDividends.sub(shareholderTotalExcluded);
    }

    function getCumulativeDividends(uint256 share) internal view returns (uint256) {
        return share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
    }

    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }

    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length-1];
        shareholderIndexes[shareholders[shareholders.length-1]] = shareholderIndexes[shareholder];
        shareholders.pop();
    }
}

contract Ether is IBEP20, Ownable {
    using SafeMath for uint256;

    address ETH =  0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "Etherflex";
    string constant _symbol = "EFLEX";
    uint8 constant _decimals = 18;

    uint256 _totalSupply = 10 * 10**9 * (10 ** _decimals);
    
    uint256 public _maxTxAmount = _totalSupply;

    //max wallet holding 
    uint256 public _maxWalletToken = _totalSupply;

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;
    mapping (address => bool) public _blackList;

    mapping (address => bool) isFeeExempt;
    mapping (address => bool) isTxLimitExempt;
    mapping (address => bool) isTimelockExempt;
    mapping (address => bool) isDividendExempt;

    
    uint256 public _feeDecimal = 0;
   // buy fee
    uint256 liquidityFee    = 0;
    uint256 reflectionFee   = 5;
    uint256 marketingFee    = 20;
    uint256 public totalFee = 4;
    uint256 feeDenominator  = 100;


    // Fees
    uint256 internal _rewardFeeCollected;
    uint256 internal _liqFeeCollected;
    uint256 internal _marketingFeeCollected; 
    

    //PreSale settings
    uint256 public preSale_RATE = 1000; //per ETH
    bool public enablePresale =false;
    uint256 private maxETHPurchaseLimit = 1e18; // 1 ETH
    mapping (address => uint256) _maxPresaleETH;

    address public autoDeadWallet;
    
    address public marketingFeeReceiver;
    address public devFeeReceiver;

    IDEXRouter public router;
    address public pair;

    DividendDistributor distributor;
    
    uint256 distributorGas = 500000;

    // Cooldown & timer functionality
    bool public buyCooldownEnabled = true;
     
    uint8 public cooldownTimerInterval = 35;
    
    mapping (address => uint) private cooldownTimer;

    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply * 10 / 100000000; // 0.01% of supply
    bool inSwap;
    event AutoLiquify(uint256 amountETH, uint256 amountBOG);
    modifier swapping() { inSwap = true; _; inSwap = false; }

    constructor () {    
        router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); 
        // Pcs v2 0x10ED43C718714eb63d5aA57B78B54704E256024E
        // UniSwap v2 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D 
        // Ps test v2 0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3                         
        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        _allowances[address(this)][address(router)] = type(uint128).max;

        distributor = new DividendDistributor(address(router));

        isFeeExempt[owner()] = true;
        isTxLimitExempt[owner()] = true;

        // No timelock for these people
        isTimelockExempt[owner()] = true;
        isTimelockExempt[DEAD] = true;
        isTimelockExempt[address(this)] = true;

        // TO DO, manually whitelist this
        //isFeeExempt[_presaleContract] = true;
        //isTxLimitExempt[_presaleContract] = true;
        //isDividendExempt[_presaleContract] = true;

        isDividendExempt[pair] = true;/*  */
        isDividendExempt[address(this)] = true;
        isDividendExempt[DEAD] = true;

        // NICE!
        autoDeadWallet = DEAD;
        marketingFeeReceiver = DEAD; // marketing address
        devFeeReceiver = DEAD; //Dev address

        _balances[owner()] = _totalSupply;
        emit Transfer(address(0),owner(), _totalSupply);
    }


    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, type(uint128).max);
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if(_allowances[sender][msg.sender] != type(uint128).max){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }


    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(!_blackList[sender],"Address is blackListed");
        if(inSwap){ return _basicTransfer(sender, recipient, amount); }


        // max wallet code
        if (!authorizations[sender] && recipient != address(this)  && recipient != address(DEAD) && recipient != pair && recipient != marketingFeeReceiver && recipient != autoDeadWallet){
            uint256 heldTokens = balanceOf(recipient);
            require((heldTokens + amount) <= _maxWalletToken,"Total Holding is currently limited, you can not buy that much.");}
        

        
        // cooldown timer, so a bot doesnt do quick trades! 1min gap between 2 trades.
        if (sender == pair &&
            buyCooldownEnabled &&
            !isTimelockExempt[recipient]) {
            require(cooldownTimer[recipient] < block.timestamp,"Please wait for cooldown between buys");
            cooldownTimer[recipient] = block.timestamp + cooldownTimerInterval;
        }


        // Checks max transaction limit
        checkTxLimit(sender, amount);

        // Liquidity, Maintained at 25%
        if(shouldSwapBack()){ swapBack(); }
        
        uint256 amountReceived;
        
      
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

         amountReceived = shouldTakeFee(sender) ? takeFee(sender, amount) : amount;
        _balances[recipient] = _balances[recipient].add(amountReceived);

        // Dividend tracker
        if(!isDividendExempt[sender]) {
            try distributor.setShare(sender, _balances[sender]) {} catch {}
        }

        if(!isDividendExempt[recipient]) {
            try distributor.setShare(recipient, _balances[recipient]) {} catch {} 
        }

        try distributor.process(distributorGas) {} catch {}

        emit Transfer(sender, recipient, amountReceived);
        return true;
        
    }
    
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function checkTxLimit(address sender, uint256 amount) internal view {
        require(amount <= _maxTxAmount || isTxLimitExempt[sender], "TX Limit Exceeded");
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isFeeExempt[sender];
    }

    function takeFee(address sender, uint256 amount) internal returns (uint256) {
        uint256 feeAmount = amount.mul(totalFee).div(10**(_feeDecimal + 2));

        uint256 liqFee = amount.mul(liquidityFee).div(10**(_feeDecimal + 2));
        uint256 _marketingFee = amount.mul(marketingFee).div(10**(_feeDecimal + 2));
        uint256 rewardFee = amount.mul(reflectionFee).div(10**(_feeDecimal + 2));

        
        _liqFeeCollected = _liqFeeCollected.add(liqFee);
        _marketingFeeCollected = _marketingFeeCollected.add(_marketingFee);
        _rewardFeeCollected = _rewardFeeCollected.add(rewardFee);

        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);
    }
    

    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
        && !inSwap
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    }

    function clearStuckBalance(uint256 amountPercentage) external onlyOwner {
        uint256 amountETH = address(this).balance;
        payable(marketingFeeReceiver).transfer(amountETH * amountPercentage / 100);
    }



    // enable cooldown between trades
    function cooldownEnabled(bool _status, uint8 _interval) public onlyOwner {
        buyCooldownEnabled = _status;
        
        cooldownTimerInterval = _interval;
    }


    function swapBack() internal swapping {

        uint256 _totalFee =_liqFeeCollected
        .add(_marketingFeeCollected)
        .add(_rewardFeeCollected);

        
        if(swapThreshold > _totalFee) return;

        uint256 amountToLiquify = _totalFee.mul(_liqFeeCollected).div(_totalFee).div(2);
        uint256 amountToSwap = _totalFee.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance.sub(balanceBefore);

        uint256 totalETHFee = _totalFee.sub(_liqFeeCollected.div(2));
        
        uint256 amountETHLiquidity = amountETH.mul(_liqFeeCollected).div(totalETHFee).div(2);
        uint256 amountETHMarketing = amountETH.mul(_marketingFeeCollected).div(totalETHFee);
        uint256 amountETHReward = amountETH.mul(_rewardFeeCollected).div(totalETHFee);

        try distributor.deposit{value: amountETHReward}() {} catch {}

        if(amountETHMarketing > 0) payable(marketingFeeReceiver).transfer(amountETHMarketing);
        
        
        if(amountToLiquify > 0){
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoDeadWallet,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
        }

        _liqFeeCollected = 0;
        _marketingFeeCollected = 0;
        _rewardFeeCollected = 0;
    }


    function setTxLimit(uint256 amount) external onlyOwner {
        _maxTxAmount = amount;
    }
    
     //settting the maximum permitted wallet holding (percent of total supply)
     function setMaxWalletPercent(uint256 maxWallPercent) external onlyOwner {
        _maxWalletToken = maxWallPercent;
    }

    function setIsDividendExempt(address holder, bool exempt) external onlyOwner {
        require(holder != address(this) && holder != pair);
        isDividendExempt[holder] = exempt;
        if(exempt){
            distributor.setShare(holder, 0);
        }else{
            distributor.setShare(holder, _balances[holder]);
        }
    }

    function setIsFeeExempt(address holder, bool exempt) external onlyOwner {
        isFeeExempt[holder] = exempt;
    }

    function setIsTxLimitExempt(address holder, bool exempt) external onlyOwner {
        isTxLimitExempt[holder] = exempt;
    }

    function setIsTimelockExempt(address holder, bool exempt) external onlyOwner {
        isTimelockExempt[holder] = exempt;
    }

 function setFees(uint256 _liquidityFee, 
        uint256 _reflectionFee, 
        uint256 _marketingFee,
        uint256 _devFee) external onlyOwner {
        liquidityFee = _liquidityFee;
        reflectionFee = _reflectionFee;
        marketingFee = _marketingFee;
        totalFee = _liquidityFee.add(_reflectionFee).add(_marketingFee).add(_devFee);
    }

    function setFeeReceivers(address _autoDeadWallet, address _marketingFeeReceiver) external onlyOwner {
        autoDeadWallet = _autoDeadWallet;
        marketingFeeReceiver = _marketingFeeReceiver;
    }

    function setSwapBackSettings( uint256 _amount) external onlyOwner {
        swapThreshold = _amount;
    }

    function setSwapEnabled(bool _enable) external onlyOwner {
        swapEnabled = _enable;
    }

    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external onlyOwner {
        distributor.setDistributionCriteria(_minPeriod, _minDistribution);
    }

    function setDistributorSettings(uint256 gas) external onlyOwner {
        require(gas < 750000);
        distributorGas = gas;
    }
    
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    function setPresaleEnable(bool _val) external onlyOwner {
        enablePresale = _val;
    }

    /*
        put _rate value like ( 1 ETH = _rate) where as _rate is the token amount 

        you want to set for 1 ETH
    */
    function setPresaleRate(uint256 _rate) external onlyOwner {
        preSale_RATE = _rate;
    }

    function setMaxETHLimit(uint256 _value) external onlyOwner {
        maxETHPurchaseLimit =_value;
    }

    function setBlackList (address add,bool value) external onlyOwner {
        _blackList[add]=value;
    }
 
    receive() external payable {
        if(!inSwap){
        require( !enablePresale ,"pre sale is finalize");
        require(_maxPresaleETH[msg.sender] <= maxETHPurchaseLimit && msg.value <= maxETHPurchaseLimit,"Max purchasing limit exceeds");
        _maxPresaleETH[msg.sender] +=msg.value;
        uint256 amount=msg.value*preSale_RATE;
        _basicTransfer(owner(),msg.sender,amount);
        payable(owner()).transfer(msg.value);
        }
    }
}