// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

/**
* Standard SafeMath, stripped down to just add/sub/mul/div
*/
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 getOwner() external view returns (address);
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);
}

/**
* Allows for contract ownership for multiple adressess
*/
abstract contract Auth {
address internal owner;
mapping (address => bool) internal authorizations;

constructor(address _owner) {
owner = _owner;
authorizations[_owner] = true;
}

/**
* Function modifier to require caller to be contract owner
*/
modifier onlyOwner() {
require(isOwner(msg.sender), "!OWNER"); _;
}

/**
* Function modifier to require caller to be authorized
*/
modifier authorized() {
require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
}

/**
* Authorize address. Owner only
*/
function authorize(address account) public onlyOwner {
authorizations[account] = true;
}

/**
* Remove address authorization. Owner only
*/
function unauthorize(address account) public onlyOwner {
authorizations[account] = false;
}

/**
* Check if address is owner
*/
function isOwner(address account) public view returns (bool) {
return account == owner;
}

/**
* Return address authorization status
*/
function isAuthorized(address account) public view returns (bool) {
return authorizations[account];
}

/**
* Transfer ownership to new address. Caller must be owner. Leaves old owner authorized
*/
function transferOwnership(address payable account) public onlyOwner {
owner = account;
authorizations[account] = true;
emit OwnershipTransferred(account);
}

event OwnershipTransferred(address owner);
}

/* Standard IDEXFactory */
interface IDEXFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}

/* Standard IDEXRouter */
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 for the DividendDistributor */
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;
}

/* Our DividendDistributor contract responsible for distributing the earn token */
contract DividendDistributor is IDividendDistributor {
using SafeMath for uint256;

address _token;

struct Share {
uint256 amount;
uint256 totalExcluded;
uint256 totalRealised;
}

// EARN
IBEP20 BTCB = IBEP20(0x7130d2A12B9BCbFAe4f2634d864A1Ee1Ce3Ead9c);
address WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;
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;

uint256 public minPeriod = 30 * 60;
uint256 public minDistribution = 1 * (10 ** 12);

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(0x10ED43C718714eb63d5aA57B78B54704E256024E);
_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 = BTCB.balanceOf(address(this));

address[] memory path = new address[](2);
path[0] = WBNB;
path[1] = address(BTCB);

router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: msg.value}(
0,
path,
address(this),
block.timestamp
);

uint256 amount = BTCB.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);
BTCB.transfer(shareholder, amount);
shareholderClaims[shareholder] = block.timestamp;
shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount);
shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
}
}

function claimDividend(address shareholder) external onlyToken{
distributeDividend(shareholder);
}

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();
}
}

/* Token contract */
contract Nirai is IBEP20, Auth {
using SafeMath for uint256;

// Addresses
address BTCB = 0x7130d2A12B9BCbFAe4f2634d864A1Ee1Ce3Ead9c;
address WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;
address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
address DEV = 0x5C32718FA88D4c04B83AB46BA0490B003CeD7c00;

// These are owner by default
address private autoLiquidityReceiver;
address private marketingFeeReceiver;

// Name and symbol
string constant _name = "Nirai Inu";
string constant _symbol = "NIRAI";
uint8 constant _decimals = 18;

// Total supply
uint256 _totalSupply = 10000000000 * (10 ** _decimals); // 1m

// Max wallet and TX
uint256 public _maxBuyTxAmount = _totalSupply * 200 / 10000; // 2% (100 mil)
uint256 public _maxSellTxAmount = _totalSupply * 100 / 10000; // 1% (100 mil)
uint256 public _maxWalletToken = ( _totalSupply * 200 ) / 10000; // 2% (100 mil)

// Mappings
mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;
mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;
mapping (address => bool) isTimelockExempt;
mapping (address => bool) isDividendExempt;
mapping (address => bool) public isBlacklisted;

// Buy Fees
uint256 public liquidityFeeBuy = 2;
uint256 public buybackFeeBuy = 0;
uint256 public reflectionFeeBuy = 0;
uint256 public marketingFeeBuy = 8;
uint256 public devFeeBuy = 0;
uint256 public totalFeeBuy = 10;

// Sell fees
uint256 public liquidityFeeSell = 0;
uint256 public buybackFeeSell = 0;
uint256 public reflectionFeeSell = 0;
uint256 public marketingFeeSell = 12;
uint256 public devFeeSell = 0;
uint256 public totalFeeSell = 12;

// Fee variables
uint256 liquidityFee;
uint256 buybackFee;
uint256 reflectionFee;
uint256 marketingFee;
uint256 devFee;
uint256 totalFee;
uint256 feeDenominator = 100;

// GREED
uint256 GREEDTriggeredAt;
uint256 GREEDDuration = 3600;

// Dead blocks
uint256 deadBlocks = 1;

// Sell amount of tokens when a sell takes place
uint256 public swapThreshold = _totalSupply * 25 / 10000; // .25% of supply

// Liquidity
uint256 targetLiquidity = 20;
uint256 targetLiquidityDenominator = 100;

// Buyback settings
uint256 buybackMultiplierNumerator = 200;
uint256 buybackMultiplierDenominator = 100;
uint256 buybackMultiplierTriggeredAt;
uint256 buybackMultiplierLength = 30 minutes;

bool public autoBuybackEnabled = false;
bool public autoBuybackMultiplier = false;
uint256 autoBuybackCap;
uint256 autoBuybackAccumulator;
uint256 autoBuybackAmount;
uint256 autoBuybackBlockPeriod;
uint256 autoBuybackBlockLast;

DividendDistributor distributor;
uint256 distributorGas = 500000;

// Cooldown & timer functionality
bool public buyCooldownEnabled = false;
uint8 public cooldownTimerInterval = 30;
mapping (address => uint) private cooldownTimer;

// Other variables
IDEXRouter public router;
address public pair;
uint256 public launchedAt;
bool public tradingOpen = true;
bool public swapEnabled = true;
bool inSwap;
modifier swapping() { inSwap = true; _; inSwap = false; }

/* Token constructor */
constructor () Auth(msg.sender) {

router = IDEXRouter(0x10ED43C718714eb63d5aA57B78B54704E256024E);
pair = IDEXFactory(router.factory()).createPair(WBNB, address(this));
_allowances[address(this)][address(router)] = type(uint256).max;

distributor = new DividendDistributor(address(router));

// Should be the owner wallet/token distributor
address _presaler = msg.sender;
isFeeExempt[_presaler] = true;
isTxLimitExempt[_presaler] = true;

// No timelock for these people
isTimelockExempt[msg.sender] = true;
isTimelockExempt[DEAD] = true;
isTimelockExempt[address(this)] = true;
isTimelockExempt[DEV] = true;

// Exempt from dividend
isDividendExempt[pair] = true;
isDividendExempt[address(this)] = true;
isDividendExempt[DEAD] = true;

// Set the marketing and liq receiver to the owner as default
autoLiquidityReceiver = msg.sender;
marketingFeeReceiver = 0xCEC847CFe13cF00d470D6946D7c7584aD3769642;

_balances[_presaler] = _totalSupply;
emit Transfer(address(0), _presaler, _totalSupply);
}

receive() external payable { }

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 getOwner() external view override returns (address) { return owner; }
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(uint256).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(uint256).max){
_allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
}
return _transferFrom(sender, recipient, amount);
}

// settting the max wallet in percentages
// NOTE: 1% = 100
function setMaxWalletPercent(uint256 maxWallPercent) external onlyOwner() {
_maxWalletToken = _totalSupply.mul(maxWallPercent).div(10000);

}

// Main transfer function
function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
if(inSwap){ return _basicTransfer(sender, recipient, amount); }

// Check if trading is enabled
if(!authorizations[sender] && !authorizations[recipient]){
require(tradingOpen,"Trading not enabled yet");
}

// Check if address is blacklisted
require(!isBlacklisted[recipient] && !isBlacklisted[sender], 'Address is blacklisted');

// Check if buying or selling
bool isSell = recipient == pair;

// Set buy or sell fees
setCorrectFees(isSell);

// Check max wallet
checkMaxWallet(sender, recipient, amount);

// Buycooldown
checkBuyCooldown(sender, recipient);

// Checks maxTx
checkTxLimit(sender, amount, recipient, isSell);

// Check if we are in GREEDTime
bool GREEDMode = inGREEDTime();

// Check if we should do the swapback
if(shouldSwapBack()){ swapBack(); }

//Exchange tokens
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

uint256 amountReceived = shouldTakeFee(sender) ? takeFee(sender, amount, isSell, GREEDMode) : 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;
}

// Do a normal transfer
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;
}

// Set the correct fees for buying or selling
function setCorrectFees(bool isSell) internal {
if(isSell){
liquidityFee = liquidityFeeSell;
buybackFee = buybackFeeSell;
reflectionFee = reflectionFeeSell;
marketingFee = marketingFeeSell;
devFee = devFeeSell;
totalFee = totalFeeSell;
} else {
liquidityFee = liquidityFeeBuy;
buybackFee = buybackFeeBuy;
reflectionFee = reflectionFeeBuy;
marketingFee = marketingFeeBuy;
devFee = devFeeBuy;
totalFee = totalFeeBuy;
}
}

// Check if we are in GREED time
function inGREEDTime() public view returns (bool){
if(GREEDTriggeredAt.add(GREEDDuration) > block.timestamp){
return true;
} else {
return false;
}
}


// Check for maxTX
function checkTxLimit(address sender, uint256 amount, address recipient, bool isSell) internal view {
if (recipient != owner){
if(isSell){
require(amount <= _maxSellTxAmount || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");
} else {
require(amount <= _maxBuyTxAmount || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");
}
}
}

// Check buy cooldown
function checkBuyCooldown(address sender, address recipient) internal {
if (sender == pair &&
buyCooldownEnabled &&
!isTimelockExempt[recipient]) {
require(cooldownTimer[recipient] < block.timestamp,"Please wait between two buys");
cooldownTimer[recipient] = block.timestamp cooldownTimerInterval;
}
}

// Check maxWallet
function checkMaxWallet(address sender, address recipient, uint256 amount) internal view {
if (!authorizations[sender] && recipient != owner && recipient != address(this) && recipient != address(DEAD) && recipient != pair && recipient != marketingFeeReceiver && recipient != autoLiquidityReceiver && recipient != DEV){
uint256 heldTokens = balanceOf(recipient);
require((heldTokens amount) <= _maxWalletToken,"Total Holding is currently limited, you can not buy that much.");
}
}

// Check if sender is not feeExempt
function shouldTakeFee(address sender) internal view returns (bool) {
return !isFeeExempt[sender];
}

// Get total fee's or multiplication of fees
function getTotalFee(bool selling) public view returns (uint256) {
if(launchedAt deadBlocks >= block.number){ return feeDenominator.sub(1); }
if(selling && buybackMultiplierTriggeredAt.add(buybackMultiplierLength) > block.timestamp){ return getMultipliedFee(); }
return totalFee;
}

// Get a multiplied fee when buybackMultiplier is active
function getMultipliedFee() public view returns (uint256) {
uint256 remainingTime = buybackMultiplierTriggeredAt.add(buybackMultiplierLength).sub(block.timestamp);
uint256 feeIncrease = totalFee.mul(buybackMultiplierNumerator).div(buybackMultiplierDenominator).sub(totalFee);
return totalFee.add(feeIncrease.mul(remainingTime).div(buybackMultiplierLength));
}

// Take the normal total Fee or the GREED Fee
function takeFee(address sender, uint256 amount, bool isSell, bool GREEDMode) internal returns (uint256) {
uint256 feeAmount;

// Check if we are GREEDd
if (GREEDMode){
if(isSell){
// We are selling so up the selling tax to 1.5x
feeAmount = amount.mul(totalFee).mul(3).div(2).div(feeDenominator);
} else {
// We are buying so cut our taxes in half
feeAmount = amount.mul(totalFee).div(2).div(feeDenominator);
}
} else {
feeAmount = amount.mul(totalFee).div(feeDenominator);
}

_balances[address(this)] = _balances[address(this)].add(feeAmount);
emit Transfer(sender, address(this), feeAmount);

return amount.sub(feeAmount);
}

// Check if we should sell tokens
function shouldSwapBack() internal view returns (bool) {
return msg.sender != pair
&& !inSwap
&& swapEnabled
&& _balances[address(this)] >= swapThreshold;
}

// switch Trading
function tradingStatus(bool _status) public onlyOwner {
tradingOpen = _status;
launch();
}

// Enable GREED
function enableGREED(uint256 _seconds) public authorized {
GREEDTriggeredAt = block.timestamp;
GREEDDuration = _seconds;
}

// Disable the GREED mode
function disableGREED() external authorized {
GREEDTriggeredAt = 0;
}

// Enable/disable cooldown between trades
function cooldownEnabled(bool _status, uint8 _interval) public authorized {
buyCooldownEnabled = _status;
cooldownTimerInterval = _interval;
}

// Blacklist/unblacklist an address
function blacklistAddress(address _address, bool _value) public authorized{
isBlacklisted[_address] = _value;
}

// Main swapback to sell tokens for WBNB
function swapBack() internal swapping {
uint256 dynamicLiquidityFee = isOverLiquified(targetLiquidity, targetLiquidityDenominator) ? 0 : liquidityFee;
uint256 amountToLiquify = swapThreshold.mul(dynamicLiquidityFee).div(totalFee).div(2);
uint256 amountToSwap = swapThreshold.sub(amountToLiquify);

address[] memory path = new address[](2);
path[0] = address(this);
path[1] = WBNB;

uint256 balanceBefore = address(this).balance;

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountBNB = address(this).balance.sub(balanceBefore);
uint256 totalBNBFee = totalFee.sub(dynamicLiquidityFee.div(2));
uint256 amountBNBLiquidity = amountBNB.mul(dynamicLiquidityFee).div(totalBNBFee).div(2);
uint256 amountBNBReflection = amountBNB.mul(reflectionFee).div(totalBNBFee);
uint256 amountBNBMarketing = amountBNB.mul(marketingFee).div(totalBNBFee);
uint256 amountBNBDev = amountBNB.mul(devFee).div(totalBNBFee);


try distributor.deposit{value: amountBNBReflection}() {} catch {}
(bool successMarketing, /* bytes memory data */) = payable(marketingFeeReceiver).call{value: amountBNBMarketing, gas: 30000}("");
(bool successDev, /* bytes memory data */) = payable(DEV).call{value: amountBNBDev, gas: 30000}("");
require(successMarketing, "marketing receiver rejected ETH transfer");
require(successDev, "dev receiver rejected ETH transfer");

if(amountToLiquify > 0){
router.addLiquidityETH{value: amountBNBLiquidity}(
address(this),
amountToLiquify,
0,
0,
autoLiquidityReceiver,
block.timestamp
);
emit AutoLiquify(amountBNBLiquidity, amountToLiquify);
}
}

// Check if autoBuyback is enabled
function shouldAutoBuyback() internal view returns (bool) {
return msg.sender != pair
&& !inSwap
&& autoBuybackEnabled
&& autoBuybackBlockLast autoBuybackBlockPeriod <= block.number
&& address(this).balance >= autoBuybackAmount;
}

// Trigger a manual buyback
function triggerManualBuyback(uint256 amount, bool triggerBuybackMultiplier) external authorized {
uint256 amountWithDecimals = amount * (10 ** 18);
uint256 amountToBuy = amountWithDecimals.div(100);
buyTokens(amountToBuy, DEAD);
if(triggerBuybackMultiplier){
buybackMultiplierTriggeredAt = block.timestamp;
emit BuybackMultiplierActive(buybackMultiplierLength);
}
}

// Stop the buyback Multiplier
function clearBuybackMultiplier() external authorized {
buybackMultiplierTriggeredAt = 0;
}

// Trigger an autobuyback
function triggerAutoBuyback() internal {
buyTokens(autoBuybackAmount, DEAD);
if(autoBuybackMultiplier){
buybackMultiplierTriggeredAt = block.timestamp;
emit BuybackMultiplierActive(buybackMultiplierLength);
}
autoBuybackBlockLast = block.number;
autoBuybackAccumulator = autoBuybackAccumulator.add(autoBuybackAmount);
if(autoBuybackAccumulator > autoBuybackCap){ autoBuybackEnabled = false; }
}

// Buy amount of tokens with bnb from the contract
function buyTokens(uint256 amount, address to) internal swapping {
address[] memory path = new address[](2);
path[0] = WBNB;
path[1] = address(this);

router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(
0,
path,
to,
block.timestamp
);
}

// Set autobuyback settings
function setAutoBuybackSettings(bool _enabled, uint256 _cap, uint256 _amount, uint256 _period, bool _autoBuybackMultiplier) external authorized {
autoBuybackEnabled = _enabled;
autoBuybackCap = _cap;
autoBuybackAccumulator = 0;
autoBuybackAmount = _amount;
autoBuybackBlockPeriod = _period;
autoBuybackBlockLast = block.number;
autoBuybackMultiplier = _autoBuybackMultiplier;
}

// Set buybackmultiplier settings
function setBuybackMultiplierSettings(uint256 numerator, uint256 denominator, uint256 length) external authorized {
require(numerator / denominator <= 2 && numerator > denominator);
buybackMultiplierNumerator = numerator;
buybackMultiplierDenominator = denominator;
buybackMultiplierLength = length;
}

// Check when the token is launched
function launched() internal view returns (bool) {
return launchedAt != 0;
}

// Set the launchedAt to token launch
function launch() internal {
launchedAt = block.number;
}

// Set max buy TX
function setBuyTxLimitInPercent(uint256 maxBuyTxPercent) external authorized {
_maxBuyTxAmount = _totalSupply.mul(maxBuyTxPercent).div(10000);
}

// Set max sell TX
function setSellTxLimitInPercent(uint256 maxSellTxPercent) external authorized {
_maxSellTxAmount = _totalSupply.mul(maxSellTxPercent).div(10000);
}

// Exempt from dividend
function setIsDividendExempt(address holder, bool exempt) external authorized {
require(holder != address(this) && holder != pair);
isDividendExempt[holder] = exempt;
if(exempt){
distributor.setShare(holder, 0);
}else{
distributor.setShare(holder, _balances[holder]);
}
}

// Exempt from fee
function setIsFeeExempt(address holder, bool exempt) external authorized {
isFeeExempt[holder] = exempt;
}

// Exempt from max TX
function setIsTxLimitExempt(address holder, bool exempt) external authorized {
isTxLimitExempt[holder] = exempt;
}

// Exempt from buy CD
function setIsTimelockExempt(address holder, bool exempt) external authorized {
isTimelockExempt[holder] = exempt;
}

// Set our buy fees
function setBuyFees(uint256 _liquidityFeeBuy, uint256 _buybackFeeBuy, uint256 _reflectionFeeBuy, uint256 _marketingFeeBuy, uint256 _devFeeBuy, uint256 _feeDenominator) external authorized {
liquidityFeeBuy = _liquidityFeeBuy;
buybackFeeBuy = _buybackFeeBuy;
reflectionFeeBuy = _reflectionFeeBuy;
marketingFeeBuy = _marketingFeeBuy;
devFeeBuy = _devFeeBuy;
totalFeeBuy = _liquidityFeeBuy.add(_buybackFeeBuy).add(_reflectionFeeBuy).add(_marketingFeeBuy).add(_devFeeBuy);
feeDenominator = _feeDenominator;
}

// Set our sell fees
function setSellFees(uint256 _liquidityFeeSell, uint256 _buybackFeeSell, uint256 _reflectionFeeSell, uint256 _marketingFeeSell, uint256 _devFeeSell, uint256 _feeDenominator) external authorized {
liquidityFeeSell = _liquidityFeeSell;
buybackFeeSell = _buybackFeeSell;
reflectionFeeSell = _reflectionFeeSell;
marketingFeeSell = _marketingFeeSell;
devFeeSell = _devFeeSell;
totalFeeSell = _liquidityFeeSell.add(_buybackFeeSell).add(_reflectionFeeSell).add(_marketingFeeSell).add(_devFeeSell);
feeDenominator = _feeDenominator;
}

// Set the marketing and liquidity receivers
function setFeeReceivers(address _autoLiquidityReceiver, address _marketingFeeReceiver) external authorized {
autoLiquidityReceiver = _autoLiquidityReceiver;
marketingFeeReceiver = _marketingFeeReceiver;
}

// Set swapBack settings
function setSwapBackSettings(bool _enabled, uint256 _amount) external authorized {
swapEnabled = _enabled;
swapThreshold = _totalSupply * _amount / 10000;
}

// Set target liquidity
function setTargetLiquidity(uint256 _target, uint256 _denominator) external authorized {
targetLiquidity = _target;
targetLiquidityDenominator = _denominator;
}

// Send BNB to marketingwallet
function manualSend() external authorized {
uint256 contractETHBalance = address(this).balance;
payable(marketingFeeReceiver).transfer(contractETHBalance);
}

// Set criteria for auto distribution
function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution) external authorized {
distributor.setDistributionCriteria(_minPeriod, _minDistribution);
}

// Let people claim there dividend
function claimDividend() external {
distributor.claimDividend(msg.sender);
}

// Check how much earnings are unpaid
function getUnpaidEarnings(address shareholder) public view returns (uint256) {
return distributor.getUnpaidEarnings(shareholder);
}

// Set gas for distributor
function setDistributorSettings(uint256 gas) external authorized {
require(gas < 750000);
distributorGas = gas;
}

// Get the circulatingSupply
function getCirculatingSupply() public view returns (uint256) {
return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
}

// Get the liquidity backing
function getLiquidityBacking(uint256 accuracy) public view returns (uint256) {
return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
}

// Get if we are over liquified or not
function isOverLiquified(uint256 target, uint256 accuracy) public view returns (bool) {
return getLiquidityBacking(accuracy) > target;
}

event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
event BuybackMultiplierActive(uint256 duration);
}