// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    function _createInitialSupply(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() external virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    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 IDexRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        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 addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
}

interface IDexFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

contract Michigan is ERC20, Ownable {

    IDexRouter public dexRouter;
    address public liqPair;

    bool private swapping;

    address private marketingWallet;

    mapping(address => uint256) private _holderLastTransferTimestamp;
    bool private transactionDelay = true;

    uint256 public minContractSell;
    uint256 public maxContractSell;

    uint256 public txLimit;
    uint256 public walletLimit;

    uint256 public buyMarketingFee;
    uint256 public sellMarketingFee;

    uint256 private tokensForMarketing;

    bool private restriction = true;

    // exlcude from fees
    mapping(address => bool) private noFees;
    mapping(address => bool) private noTxLimit;

    mapping(address => bool) private liquidityPair;

    event TxLimitExcluded(address _address, bool excluded);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event TriggerContractSell(uint256 timestamp);

    event SetLiquidityPair(address indexed pair, bool indexed value);
    
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiquidity
    );

    event TransferForeignToken(address token, uint256 amount);

    constructor() ERC20(unicode"Michigan the Frog", unicode"MICHIGAN") {
        IDexRouter _dexRouter = IDexRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        dexRouter = _dexRouter;

        liqPair = IDexFactory(_dexRouter.factory()).createPair(address(this), _dexRouter.WETH());
        setLiquidityPair(address(liqPair), true);

        uint256 totalSupply = 100_000_000_000 * 1e18; // set your favorite supply

        txLimit = (totalSupply) / 100; // 1% max tx, also can be totalSupply x 2 / 100 to make it 2%
        walletLimit = (totalSupply) / 100; // 1% max wallet, also can be totalSupply x 2 / 100 to make it 2%

        minContractSell = (totalSupply * 5) / 10000; // 0.05% contract sell
        maxContractSell = (totalSupply) / 100; // 1% contract sell

        buyMarketingFee = 15;
        sellMarketingFee = 40;

        marketingWallet = address(0x37AD76c94FD3B0D25569d01B3CD335c730257E49);

        // exclude from paying fees
        noFees[msg.sender] = true;
        noFees[marketingWallet] = true;
        noFees[address(this)] = true;
        noFees[address(0xdead)] = true;

        noTxLimit[owner()] = true;
        noTxLimit[address(this)] = true;
        noTxLimit[address(0xdead)] = true;
        noTxLimit[marketingWallet] = true;

        _createInitialSupply(msg.sender, totalSupply);
    }

    receive() external payable {}

    // remove all limits after token is stable, you can change this function name to what you want
    function michi() external onlyOwner returns (bool) {
        buyMarketingFee = 0;
        sellMarketingFee = 0;

        restriction = false;
        transactionDelay = false;
        return true;
    }

    function setLiquidityPair(address pair, bool value) private {
        liquidityPair[pair] = value;

        emit SetLiquidityPair(pair, value);
    }

    function _transfer(address from, address to, uint256 amount) internal override {

        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "amount must be greater than 0");

        if(restriction){
            if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !noFees[from] && !noFees[to]){

                // at launch if the transaction delay is enabled, ensure the block timestamps for purchasers is set -- during launch.
                if (transactionDelay){
                    if (to != address(dexRouter) && to != address(liqPair)){
                        require(_holderLastTransferTimestamp[tx.origin] < block.number - 2 && _holderLastTransferTimestamp[to] < block.number - 2, "_transfer:: Transaction Delay enabled.  Try again later.");
                        _holderLastTransferTimestamp[tx.origin] = block.number;
                        _holderLastTransferTimestamp[to] = block.number;
                    }
                }
    
                //when buy
                if (liquidityPair[from] && !noTxLimit[to]) {
                        require(amount <= txLimit, "Buy transfer amount exceeds the max buy.");
                        require(amount + balanceOf(to) <= walletLimit, "Cannot Exceed max wallet");
                }
                //when sell
                else if (liquidityPair[to] && !noTxLimit[from]) {
                        require(amount <= txLimit, "Sell transfer amount exceeds the max sell.");
                }
                else if (!noTxLimit[to]){
                    require(amount + balanceOf(to) <= walletLimit, "Cannot Exceed max wallet");
                }
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));

        bool canSwap = contractTokenBalance >= minContractSell;

        if(canSwap && !swapping && !liquidityPair[from] && !noFees[from] && !noFees[to]) {
            swapping = true;

            contractSell();

            swapping = false;
        }

        bool takeFee = true;
        // if any addy belongs to noFees account then remove the fee
        if(noFees[from] || noFees[to]) {
            takeFee = false;
        }

        uint256 fees = 0;
        // only take fees on buys/sells, do not take on wallet transfers
        if(takeFee){
            // on sell
            if (liquidityPair[to] && sellMarketingFee > 0){
                fees = amount * sellMarketingFee / 100;
                tokensForMarketing += fees * sellMarketingFee / sellMarketingFee;
            }

            // on buy
            else if(liquidityPair[from] && buyMarketingFee > 0) {
        	    fees = amount * buyMarketingFee / 100;
                tokensForMarketing += fees * buyMarketingFee / buyMarketingFee;
            }

            if(fees > 0){
                super._transfer(from, address(this), fees);
            }

        	amount -= fees;
        }

        super._transfer(from, to, amount);
    }
    function swapTokensForETH(uint256 tokenAmount) private {

        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = dexRouter.WETH();

        _approve(address(this), address(dexRouter), tokenAmount);

        // make the swap
        dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(dexRouter), tokenAmount);

        // add the liquidity
        dexRouter.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            address(0xdead),
            block.timestamp
        );
    }

    function contractSell() private {
        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = tokensForMarketing;

        if(contractBalance == 0 || totalTokensToSwap == 0) {return;}

        if(contractBalance > maxContractSell){
            contractBalance = maxContractSell;
        }

        bool success;

        swapTokensForETH(contractBalance);

        tokensForMarketing = 0;

        if(address(this).balance > 0){
            (success,) = address(marketingWallet).call{value: address(this).balance}("");
        }
    }

    function transferForeignToken(address _token, address _to) external onlyOwner returns (bool _sent) {
        require(_token != address(0), "_token address cannot be 0");
        uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
        _sent = IERC20(_token).transfer(_to, _contractBalance);
        emit TransferForeignToken(_token, _contractBalance);
    }

    // withdraw ETH if stuck or someone sends to the address
    function withdrawETH() external onlyOwner {
        bool success;
        (success,) = address(msg.sender).call{value: address(this).balance}("");
    }

    // force contract to sell if slippage issues.
    function forceContractSell() external onlyOwner {
        require(balanceOf(address(this)) >= 0, "No tokens to swap");
        swapping = true;
        contractSell();
        swapping = false;
        emit TriggerContractSell(block.timestamp);
    }

}