Based Monsta

// SPDX-License-Identifier: MIT

/*
+------------------------------------------------------------------+
|   __       __   ______   __    __   ______   ________  ______    |
|  /  \     /  | /      \ /  \  /  | /      \ /        |/      \   |
|  $$  \   /$$ |/$$$$$$  |$$  \ $$ |/$$$$$$  |$$$$$$$$//$$$$$$  |  |
|  $$$  \ /$$$ |$$ |  $$ |$$$  \$$ |$$ \__$$/    $$ |  $$ |__$$ |  |
|  $$$$  /$$$$ |$$ |  $$ |$$$$  $$ |$$      \    $$ |  $$    $$ |  |
|  $$ $$ $$/$$ |$$ |  $$ |$$ $$ $$ | $$$$$$  |   $$ |  $$$$$$$$ |  |
|  $$ |$$$/ $$ |$$ \__$$ |$$ |$$$$ |/  \__$$ |   $$ |  $$ |  $$ |  |
|  $$ | $/  $$ |$$    $$/ $$ | $$$ |$$    $$/    $$ |  $$ |  $$ |  |
|  $$/      $$/  $$$$$$/  $$/   $$/  $$$$$$/     $$/   $$/   $$/   |
+------------------------------------------------------------------+

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/*
    01000010 01001111 01001110 01010101 01010011
    01000011 01001111 01000100 01000101
*/

pragma solidity 0.8.26;

// lib/openzeppelin-contracts/contracts/interfaces/draft-IERC6093.sol

// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/draft-IERC6093.sol)

/**
 * @dev Standard ERC-20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(
        address sender,
        uint256 balance,
        uint256 needed
    );

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(
        address spender,
        uint256 allowance,
        uint256 needed
    );

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol

// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @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
    );

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
}

// lib/openzeppelin-contracts/contracts/utils/Context.sol

// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// lib/openzeppelin-contracts/contracts/utils/ReentrancyGuard.sol

// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

// lib/openzeppelin-contracts/contracts/access/Ownable.sol

// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol

// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/extensions/IERC20Metadata.sol)

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
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);
}

// lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol

// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/ERC20.sol)

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC-20
 * applications.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256))
        private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(
        address owner,
        address spender
    ) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(
        address spender,
        uint256 value
    ) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Skips emitting an {Approval} event indicating an allowance update. This is not
     * required by the ERC. See {xref-ERC20-_approve-address-address-uint256-bool-}[_approve].
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     *
     * ```solidity
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(
        address owner,
        address spender,
        uint256 value,
        bool emitEvent
    ) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 value
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(
                    spender,
                    currentAllowance,
                    value
                );
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// src/MONSTA.sol

interface IUniswapV2Router {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable;
}

interface IUniswapV2Factory {
    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);

    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

interface IUniswapV2Pair {
    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
}

error RecoverySelfTokenNotAllowed();
error ERC20TransferFailed();
error InvalidTaxPercentage();
error SwapFailed();
error ZeroAddress();
error BurnRemovalNotReady();
error TradingNotEnabled();
error MinimumTokensToSellTooHigh();

contract MONSTA is ERC20, Ownable, ReentrancyGuard {
    uint256 public constant BUY_TAX_BPS = 300; // Hardcoded 3% buy tax
    uint256 public constant SELL_TAX_BPS = 300; // Hardcoded 3% sell tax
    uint256 public immutable BURN_REMOVAL_TIMESTAMP; // Timestamp when burn can be removed
    uint256 private constant TWELVE_MONTHS = 365 days;
    uint256 public constant INITIAL_SUPPLY = 10_000_000_000 ether;
    uint256 public minimumTokensToSell;

    address public taxReceiver;
    bool public burnEnabled = true; // Flag to control burn functionality
    bool public tradingEnabled = false;

    address public immutable WETH;
    address public immutable mainPair;
    IUniswapV2Router public activeRouter;

    mapping(address => bool) public isLpPair;
    mapping(address => bool) public isExempt;

    event TaxRecipientUpdate(address taxReceiver);
    event LpPairUpdated(address pair, bool isActive);
    event TaxBurned(uint256 amount);
    event SellBurnPercentageUpdated(uint256 percentage);
    event ExcludedFromTax(address indexed account, bool isExempt);
    event RouterUpdated(address indexed oldRouter, address indexed newRouter);
    event TradingEnabled();
    event MinimumTokensToSellUpdated(uint256 newMinimum);

    constructor(
        address _router,
        address _receiver
    ) ERC20("Based Monsta", "MONSTA") Ownable(msg.sender) {
        if (_router == address(0)) revert ZeroAddress();
        activeRouter = IUniswapV2Router(_router);
        BURN_REMOVAL_TIMESTAMP = block.timestamp + TWELVE_MONTHS;
        IUniswapV2Factory factory = IUniswapV2Factory(
            IUniswapV2Router(_router).factory()
        );
        WETH = IUniswapV2Router(_router).WETH();
        taxReceiver = _receiver;

        // Set deployer as exempt
        isExempt[address(this)] = true;
        isExempt[msg.sender] = true;
        emit ExcludedFromTax(msg.sender, true);

        _mint(msg.sender, INITIAL_SUPPLY);

        // Calculate minimum tokens to sell as 0.001% of total supply
        minimumTokensToSell = INITIAL_SUPPLY / 100000; // 0.001%

        // Create and set the WETH pair
        mainPair = factory.createPair(address(this), WETH);
        isLpPair[mainPair] = true;
        emit LpPairUpdated(mainPair, true);

        // Approve router for max
        _approve(address(this), _router, type(uint256).max);
    }

    function setLpPair(address pair, bool isActive) external onlyOwner {
        isLpPair[pair] = isActive;
        emit LpPairUpdated(pair, isActive);
    }

    function setTaxReceiver(address _taxReceiver) external onlyOwner {
        taxReceiver = _taxReceiver;
        emit TaxRecipientUpdate(_taxReceiver);
    }

    function sellBurnPercentageRemoved() external onlyOwner {
        if (block.timestamp < BURN_REMOVAL_TIMESTAMP) {
            revert BurnRemovalNotReady();
        }
        burnEnabled = false;
        emit SellBurnPercentageUpdated(0);
    }

    function setExempt(address account, bool exempt) external onlyOwner {
        isExempt[account] = exempt;
        emit ExcludedFromTax(account, exempt);
    }

    function _calculateTaxAmounts(
        uint256 totalTax
    ) private view returns (uint256 burnAmount, uint256 keepAmount) {
        if (!burnEnabled) return (0, totalTax);

        burnAmount = totalTax / 3; // 1/3 of tax is burned when enabled
        keepAmount = totalTax - burnAmount; // 2/3 of tax is kept
    }

    function _update(
        address from,
        address to,
        uint256 amount
    ) internal virtual override {
        // Skip trading check for exempt addresses
        if (isExempt[from] || isExempt[to]) {
            super._update(from, to, amount);
            return;
        }

        // Prevent trading if not enabled
        if (!tradingEnabled) {
            revert TradingNotEnabled();
        }

        uint256 taxAmount = 0;

        // Apply hardcoded taxes
        if (isLpPair[from]) {
            // This is a buy - apply fixed 3% tax
            taxAmount = (amount * BUY_TAX_BPS) / 10000;
            if (taxAmount > 0) {
                super._update(from, address(this), taxAmount);
                super._update(from, to, amount - taxAmount);
            }
        } else if (isLpPair[to]) {
            // sell accumulated tokens before applying tax
            _sellAccumulatedTokens();
            // This is a sell - apply fixed 3% tax with optional burn
            taxAmount = (amount * SELL_TAX_BPS) / 10000;
            if (taxAmount > 0) {
                (uint256 burnAmount, uint256 keepAmount) = _calculateTaxAmounts(
                    taxAmount
                );

                super._update(from, address(this), keepAmount);
                if (burnAmount > 0) {
                    _burn(from, burnAmount);
                    emit TaxBurned(burnAmount);
                }
                super._update(from, to, amount - taxAmount);
            }
        } else {
            super._update(from, to, amount);
        }
    }

    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
    }

    function burnFrom(address account, uint256 amount) external {
        uint256 currentAllowance = allowance(account, msg.sender);
        if (currentAllowance < amount) {
            revert ERC20InsufficientAllowance(
                msg.sender,
                currentAllowance,
                amount
            );
        }
        _spendAllowance(account, msg.sender, amount);
        _burn(account, amount);
    }

    function recoverERC20(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        if (token == address(this)) {
            revert RecoverySelfTokenNotAllowed();
        }

        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(ERC20.transfer.selector, to, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20TransferFailed();
        }
    }

    function sellAccumulatedTokens() external onlyOwner {
        _sellAccumulatedTokens();
    }

    function _sellAccumulatedTokens() private nonReentrant {
        uint256 tokenBalance = balanceOf(address(this));

        // Use configurable minimum threshold
        if (tokenBalance < minimumTokensToSell) return;

        // Setup the path for swapping
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        try
            IUniswapV2Router(activeRouter)
                .swapExactTokensForETHSupportingFeeOnTransferTokens(
                    tokenBalance,
                    0,
                    path,
                    taxReceiver,
                    block.timestamp
                )
        {} catch {
            revert SwapFailed();
        }
    }

    function updateRouter(address newRouter) external onlyOwner {
        if (newRouter == address(0)) revert ZeroAddress();

        // Revoke approval from old router
        _approve(address(this), address(activeRouter), 0);

        // Approve new router
        _approve(address(this), newRouter, type(uint256).max);

        emit RouterUpdated(address(activeRouter), newRouter);
        activeRouter = IUniswapV2Router(newRouter);
    }

    function enableTrading() external onlyOwner {
        if (tradingEnabled) return; // Already enabled, just return
        tradingEnabled = true;
        emit TradingEnabled();
    }

    function setMinimumTokensToSell(
        uint256 _minimumTokensToSell
    ) external onlyOwner {
        if (
            _minimumTokensToSell > INITIAL_SUPPLY / 100 ||
            _minimumTokensToSell < 1 gwei
        ) {
            revert MinimumTokensToSellTooHigh();
        }
        minimumTokensToSell = _minimumTokensToSell;
        emit MinimumTokensToSellUpdated(_minimumTokensToSell);
    }
}

{
  "compilationTarget": {
    "contracts/MONSTA.sol": "MONSTA"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}