//SPDX-License-Identifier: MIT

pragma solidity ^0.7.4;

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) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
}

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);
}

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;
function claimDividend(address holder) external;
}

contract DividendDistributor is IDividendDistributor {

using SafeMath for uint256;
address _token;

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

IDEXRouter router;
address routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
IBEP20 RewardToken = IBEP20(0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56); //BUSD

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 = 60 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(routerAddress);
_token = msg.sender;
}

function setDistributionCriteria(uint256 newMinPeriod, uint256 newMinDistribution) external override onlyToken {
minPeriod = newMinPeriod;
minDistribution = newMinDistribution;
}

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 = RewardToken.balanceOf(address(this));

address[] memory path = new address[](2);
path[0] = router.WETH();
path[1] = address(RewardToken);

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

uint256 amount = RewardToken.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 iterations = 0;
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();

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

}

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();
}

function claimDividend(address holder) external override {
distributeDividend(holder);
}
}

abstract contract Ownable {
address internal owner;

constructor(address _owner) {
owner = _owner;
}

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

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

/**
* Transfer ownership to new address. Caller must be owner.
*/
function transferOwnership(address payable adr) public onlyOwner {
owner = adr;
emit OwnershipTransferred(adr);
}

event OwnershipTransferred(address owner);
}

contract EasterCheems is IBEP20, Ownable {

using SafeMath for uint256;

string constant _name = "Easter Cheems";
string constant _symbol = "ECHEEMS";
uint8 constant _decimals = 9;

address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
address TEAM = 0x38aFbf2A0e3DE4F94eff0614d19c73130745fF9C;
address routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
address RewardToken = 0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56;

uint256 _totalSupply = 1000000000000 * (10 ** _decimals);
uint256 public _maxTxAmount = _totalSupply * 1 / 100;
uint256 public _walletMax = _totalSupply * 3 / 100;

bool public restrictWhales = true;

mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;

mapping (address => bool) public isFeeExempt;
mapping (address => bool) public isTxLimitExempt;
mapping (address => bool) public isDividendExempt;

uint256 public liquidityFee = 3;
uint256 public marketingFee = 7;
uint256 public rewardsFee = 2;
uint256 public extraFeeOnSell = 3;

uint256 public totalFee = 0;
uint256 public totalFeeIfSelling = 0;

address public autoLiquidityReceiver;
address public marketingWallet;
address private anothermarketingWallet;

IDEXRouter public router;
address public pair;

uint256 public launchedAt;
bool public tradingOpen = false;

DividendDistributor public dividendDistributor;
uint256 distributorGas = 300000;

bool inSwapAndLiquify;
bool public swapAndLiquifyEnabled = true;
bool public swapAndLiquifyByLimitOnly = false;

uint256 public swapThreshold = _totalSupply * 5 / 2000;

modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}

constructor () Ownable(msg.sender) {

router = IDEXRouter(routerAddress);
pair = IDEXFactory(router.factory()).createPair(router.WETH(), address(this));
_allowances[address(this)][address(router)] = uint256(-1);

dividendDistributor = new DividendDistributor(address(router));

isFeeExempt[msg.sender] = true;
isFeeExempt[address(this)] = true;
isFeeExempt[TEAM] = true;

isTxLimitExempt[msg.sender] = true;
isTxLimitExempt[pair] = true;
isTxLimitExempt[TEAM] = true;

isDividendExempt[pair] = true;
isDividendExempt[msg.sender] = true;
isDividendExempt[address(this)] = true;
isDividendExempt[DEAD] = true;
isDividendExempt[ZERO] = true;
isDividendExempt[TEAM] = true;

// NICE!
autoLiquidityReceiver = msg.sender;
marketingWallet = msg.sender; //marketing wallet
anothermarketingWallet = msg.sender;

totalFee = liquidityFee.add(marketingFee).add(rewardsFee);
totalFeeIfSelling = totalFee.add(extraFeeOnSell);

_balances[msg.sender] = _totalSupply;
emit Transfer(address(0), msg.sender, _totalSupply);
}

receive() external payable { }

function name() external pure override returns (string memory) { return _name; }
function symbol() external pure override returns (string memory) { return _symbol; }
function decimals() external pure override returns (uint8) { return _decimals; }
function totalSupply() external view override returns (uint256) { return _totalSupply; }
function getOwner() external view override returns (address) { return owner; }

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

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, uint256(-1));
}


function claim() public {
dividendDistributor.claimDividend(msg.sender);

}

function launched() internal view returns (bool) {
return launchedAt != 0;
}

function launch() internal {
launchedAt = block.number;
}

function changeTxLimit(uint256 newLimit) external onlyOwner {
_maxTxAmount = newLimit;
}

function changeWalletLimit(uint256 newLimit) external onlyOwner {
_walletMax = newLimit;
}

function changeRestrictWhales(bool newValue) external onlyOwner {
restrictWhales = newValue;
}

function changeIsFeeExempt(address holder, bool exempt) external onlyOwner {
isFeeExempt[holder] = exempt;
}

function changeIsTxLimitExempt(address holder, bool exempt) external onlyOwner {
isTxLimitExempt[holder] = exempt;
}

function changeIsDividendExempt(address holder, bool exempt) external onlyOwner {
require(holder != address(this) && holder != pair);
isDividendExempt[holder] = exempt;

if(exempt){
dividendDistributor.setShare(holder, 0);
}else{
dividendDistributor.setShare(holder, _balances[holder]);
}
}

function changeFees(uint256 newLiqFee, uint256 newRewardFee, uint256 newMarketingFee, uint256 newExtraSellFee) external onlyOwner {
liquidityFee = newLiqFee;
rewardsFee = newRewardFee;
marketingFee = newMarketingFee;
extraFeeOnSell = newExtraSellFee;

totalFee = liquidityFee.add(marketingFee).add(rewardsFee);
totalFeeIfSelling = totalFee.add(extraFeeOnSell);
}

function changeFeeReceivers(address newLiquidityReceiver, address newMarketingWallet, address newanothermarketingWallet) external onlyOwner {
autoLiquidityReceiver = newLiquidityReceiver;
marketingWallet = newMarketingWallet;
anothermarketingWallet = newanothermarketingWallet;
}

function changeSwapBackSettings(bool enableSwapBack, uint256 newSwapBackLimit, bool swapByLimitOnly) external onlyOwner {
swapAndLiquifyEnabled = enableSwapBack;
swapThreshold = newSwapBackLimit;
swapAndLiquifyByLimitOnly = swapByLimitOnly;
}

function changeDistributionCriteria(uint256 newinPeriod, uint256 newMinDistribution) external onlyOwner {
dividendDistributor.setDistributionCriteria(newinPeriod, newMinDistribution);
}

function changeDistributorSettings(uint256 gas) external onlyOwner {
require(gas < 750000);
distributorGas = gas;
}

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] != uint256(-1)){
_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) {

if(inSwapAndLiquify){ return _basicTransfer(sender, recipient, amount); }

if(!isOwner(sender) && !isOwner(recipient)){
require(tradingOpen, "Trading not open yet");
}

require(amount <= _maxTxAmount || isTxLimitExempt[sender], "TX Limit Exceeded");

if(msg.sender != pair && !inSwapAndLiquify && swapAndLiquifyEnabled && _balances[address(this)] >= swapThreshold){ swapBack(); }

if(!launched() && recipient == pair) {
require(_balances[sender] > 0);
launch();
}

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

if(!isTxLimitExempt[recipient] && restrictWhales)
{
require(_balances[recipient].add(amount) <= _walletMax);
}

uint256 finalAmount = !isFeeExempt[sender] && !isFeeExempt[recipient] ? takeFee(sender, recipient, amount) : amount;
_balances[recipient] = _balances[recipient].add(finalAmount);

// Dividend tracker
if(!isDividendExempt[sender]) {
try dividendDistributor.setShare(sender, _balances[sender]) {} catch {}
}

if(!isDividendExempt[recipient]) {
try dividendDistributor.setShare(recipient, _balances[recipient]) {} catch {}
}

try dividendDistributor.process(distributorGas) {} catch {}

emit Transfer(sender, recipient, finalAmount);
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 takeFee(address sender, address recipient, uint256 amount) internal returns (uint256) {

uint256 feeApplicable = pair == recipient ? totalFeeIfSelling : totalFee;
uint256 feeAmount = amount.mul(feeApplicable).div(100);

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

return amount.sub(feeAmount);
}

function tradingStatus(bool newStatus) public onlyOwner {
tradingOpen = newStatus;
}

function swapBack() internal lockTheSwap {

uint256 tokensToLiquify = _balances[address(this)];
uint256 amountToLiquify = tokensToLiquify.mul(liquidityFee).div(totalFee).div(2);
uint256 amountToSwap = tokensToLiquify.sub(amountToLiquify);

address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);

uint256 amountBNB = address(this).balance;

uint256 totalBNBFee = totalFee.sub(liquidityFee.div(2));

uint256 amountBNBLiquidity = amountBNB.mul(liquidityFee).div(totalBNBFee).div(2);
uint256 amountBNBReflection = amountBNB.mul(rewardsFee).div(totalBNBFee);
uint256 amountBNBMarketing = amountBNB.sub(amountBNBLiquidity).sub(amountBNBReflection);

try dividendDistributor.deposit{value: amountBNBReflection}() {} catch {}

uint256 marketingShare = amountBNBMarketing.mul(3).div(4);
uint256 anothermarketingShare = amountBNBMarketing.sub(marketingShare);

(bool tmpSuccess,) = payable(marketingWallet).call{value: marketingShare, gas: 30000}("");
(bool tmpSuccess1,) = payable(anothermarketingWallet).call{value: anothermarketingShare, gas: 30000}("");

// only to supress warning msg
tmpSuccess = false;
tmpSuccess1 = false;

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

event AutoLiquify(uint256 amountBNB, uint256 amountBOG);

}