// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * 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 ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
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;

    /**
     * @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 override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override 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 `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` 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 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * 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 `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `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.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` 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.
     */
    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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

// Interface for Uniswap
interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

interface IUniswapV2Router02 {
    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 addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    )
        external
        payable
        returns (uint amountToken, uint amountETH, uint liquidity);
}

/**
 * @title GatrToken
 * @dev Implementation of the GATR token with custom tax and distribution functionality
 */
contract GatrToken is ERC20, Ownable, ReentrancyGuard, Pausable {
    using SafeMath for uint256;

    // Token settings
    uint256 private constant TOTAL_SUPPLY = 100_000_000 * 10 ** 18; // 100 million tokens
    uint256 private constant MAX_TAX = 1500; // 15% maximum tax
    uint256 private immutable LAUNCH_TIME;

    // Uniswap
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;

    // Trading settings
    bool public tradingEnabled = false;
    uint256 public maxTxAmount = TOTAL_SUPPLY.mul(1).div(100); // 1% of total supply per tx

    // Max wallet size (anti-whale)
    uint256 public maxWalletAmount = TOTAL_SUPPLY.mul(1).div(100); // 1% of total supply

    // Tax settings
    uint256 public buyTax = 300; // 3%
    uint256 public sellTax = 500; // 5%
    uint256 public transferTax = 200; // 2%
    uint256 public constant TAX_DENOMINATOR = 10000;

    // Wallet distribution percentages
    uint256 public marketingShare = 40; // 40% of tax goes to marketing
    uint256 public devShare = 40; // 40% of tax goes to dev
    uint256 public liquidityShare = 20; // 20% of tax goes to liquidity
    uint256 public constant SHARE_DENOMINATOR = 100;

    // Wallets
    address public marketingWallet;
    address public devWallet;

    // Swapping settings
    bool private swapping;
    uint256 public swapTokensAtAmount = TOTAL_SUPPLY.mul(1).div(10000); // 0.01% of supply
    uint256 public maxTokensInContract = TOTAL_SUPPLY.mul(2).div(100); // 2% max tokens that can accumulate

    // Timelock settings
    mapping(bytes32 => uint256) private _timeLocks;
    uint256 public timeLockDuration = 24 hours;

    // Tax options
    bool public tokenDistributionEnabled = true; // New flag to control token distribution
    bool public autoLiquidityEnabled = true; // Flag to control auto liquidity generation

    // Exemptions
    mapping(address => bool) public isExcludedFromFees;
    mapping(address => bool) public isExcludedFromMaxWallet;
    mapping(address => bool) public isExcludedFromMaxTx;

    // Blacklist for anti-bot
    mapping(address => bool) public isBlacklisted;

    // Events
    event TimeLockDurationChanged(uint256 newDuration);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event ExcludeFromMaxWallet(address indexed account, bool isExcluded);
    event ExcludeFromMaxTx(address indexed account, bool isExcluded);
    event SetBuyTax(uint256 newTax);
    event SetSellTax(uint256 newTax);
    event SetTransferTax(uint256 newTax);
    event SetMaxWalletAmount(uint256 newAmount);
    event SetMaxTxAmount(uint256 newAmount);
    event UpdateMarketingWallet(address indexed newWallet);
    event UpdateDevWallet(address indexed newWallet);
    event TradingEnabled();
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiquidity
    );
    event TokensDistributed(uint256 marketingTokens, uint256 devTokens);
    event TimelockCreated(bytes32 indexed functionId, uint256 releaseTime);
    event TimelockCancelled(bytes32 indexed functionId);
    event UpdatedUniswapRouter(
        address indexed newRouter,
        address indexed newPair
    );
    event TokenDistributionToggled(bool enabled);
    event AutoLiquidityToggled(bool enabled);
    event AdminTokensWithdrawn(uint256 amount);
    event AdminChanged(address indexed previousAdmin, address indexed newAdmin);
    event AddressBlacklisted(address indexed account, bool blacklisted);
    event TokensBurned(address indexed burner, uint256 amount);
    event TokensMinted(address indexed to, uint256 amount);
    event LiquidityAdded(uint256 tokenAmount, uint256 ethAmount);

    // Using Sepolia Uniswap V2 Router for deployment
    // Sepolia Uniswap V2 Router: 0xC532a74256D3Db42D0Bf7a0400fEFDbad7694008
    // Mainnet Uniswap V2 Router: 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
    constructor() ERC20("Gatr Token", "GATR") Ownable() {
        marketingWallet = msg.sender;
        devWallet = msg.sender;
        LAUNCH_TIME = block.timestamp;

        // Set up router and pair - using Sepolia router
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );

        // Create pair
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
                address(this),
                uniswapV2Router.WETH()
            );

        // Exclude owner and contract from fees
        isExcludedFromFees[owner()] = true;
        isExcludedFromFees[address(this)] = true;
        isExcludedFromFees[address(0)] = true;

        // Exclude from max wallet
        isExcludedFromMaxWallet[owner()] = true;
        isExcludedFromMaxWallet[address(this)] = true;
        isExcludedFromMaxWallet[address(0)] = true;
        isExcludedFromMaxWallet[uniswapV2Pair] = true;

        // Exclude from max tx
        isExcludedFromMaxTx[owner()] = true;
        isExcludedFromMaxTx[address(this)] = true;
        isExcludedFromMaxTx[address(0)] = true;
        isExcludedFromMaxTx[uniswapV2Pair] = true;

        // Mint tokens to deployer
        _mint(msg.sender, TOTAL_SUPPLY);
    }

    /**
     * @dev Returns token metadata URI
     */
    function tokenURI() external pure returns (string memory) {
        return "https://gatrlabs.com/token-metadata.json";
    }

    /**
     * @dev Override ERC20 transfer function to apply taxes and limits
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override whenNotPaused {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        require(
            !isBlacklisted[from] && !isBlacklisted[to],
            "Address is blacklisted"
        );

        // Check trading status
        if (!tradingEnabled) {
            require(
                isExcludedFromFees[from] || isExcludedFromFees[to],
                "Trading not yet enabled"
            );
        }

        // Check max transaction amount
        if (
            !isExcludedFromMaxTx[from] &&
            !isExcludedFromMaxTx[to] &&
            from != uniswapV2Pair // Allow any size buys
        ) {
            require(
                amount <= maxTxAmount,
                "Transfer amount exceeds the maxTxAmount"
            );
        }

        // Check max wallet - gas optimization for common cases
        if (
            !isExcludedFromMaxWallet[to] &&
            to != uniswapV2Pair &&
            to != address(uniswapV2Router)
        ) {
            require(
                balanceOf(to).add(amount) <= maxWalletAmount,
                "Transfer amount exceeds the maxWalletAmount"
            );
        }

        // Auto-swap tokens for ETH when selling, but avoid nested swaps
        bool canSwap = balanceOf(address(this)) >= swapTokensAtAmount;

        if (
            canSwap &&
            !swapping &&
            from != uniswapV2Pair &&
            to == uniswapV2Pair &&
            tradingEnabled
        ) {
            // Cap the amount to swap to prevent gas issues
            uint256 tokenAmountToSwap = balanceOf(address(this));
            if (tokenAmountToSwap > maxTokensInContract) {
                tokenAmountToSwap = maxTokensInContract;
            }

            // Enter swapping state to avoid re-entrancy
            swapping = true;

            if (autoLiquidityEnabled && !tokenDistributionEnabled) {
                // Split tokens for liquidity and direct swap
                uint256 tokensForLiquidity = tokenAmountToSwap
                    .mul(liquidityShare)
                    .div(SHARE_DENOMINATOR);
                uint256 tokensToSwap = tokenAmountToSwap.sub(
                    tokensForLiquidity
                );

                if (tokensToSwap > 0) {
                    swapAndLiquify(tokensToSwap, tokensForLiquidity);
                }
            } else {
                // Just swap all tokens
                swapTokensForEth(tokenAmountToSwap);
            }

            swapping = false;
        }

        // Calculate taxes - gas optimization by skipping when possible
        if (isExcludedFromFees[from] || isExcludedFromFees[to] || swapping) {
            super._transfer(from, to, amount);
            return;
        }

        // Set tax amount based on transfer type
        uint256 taxAmount = 0;

        // Buy
        if (from == uniswapV2Pair) {
            taxAmount = amount.mul(buyTax).div(TAX_DENOMINATOR);
        }
        // Sell
        else if (to == uniswapV2Pair) {
            taxAmount = amount.mul(sellTax).div(TAX_DENOMINATOR);
        }
        // Transfer
        else {
            taxAmount = amount.mul(transferTax).div(TAX_DENOMINATOR);
        }

        // Take the tax if applicable
        if (taxAmount > 0) {
            if (tokenDistributionEnabled) {
                // Distribute tokens directly to wallets
                uint256 marketingTokens = taxAmount.mul(marketingShare).div(
                    SHARE_DENOMINATOR
                );
                uint256 devTokens = taxAmount.mul(devShare).div(
                    SHARE_DENOMINATOR
                );
                uint256 liquidityTokens = taxAmount.sub(marketingTokens).sub(
                    devTokens
                );

                // Transfer to marketing wallet
                super._transfer(from, marketingWallet, marketingTokens);

                // Transfer to dev wallet
                super._transfer(from, devWallet, devTokens);

                // Transfer to contract for liquidity
                super._transfer(from, address(this), liquidityTokens);

                // Adjust amount after direct distribution
                amount = amount.sub(taxAmount);

                emit TokensDistributed(marketingTokens, devTokens);
            } else {
                // Transfer to contract for later conversion to ETH
                super._transfer(from, address(this), taxAmount);
                amount = amount.sub(taxAmount);
            }
        }

        // Complete the transfer
        super._transfer(from, to, amount);
    }

    /**
     * @dev Add liquidity with part of the tokens and distribute ETH
     */
    function swapAndLiquify(
        uint256 tokensToSwap,
        uint256 tokensForLiquidity
    ) private {
        // Generate the uniswap pair path of token -> WETH
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        // Approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokensToSwap);

        // Get initial ETH balance
        uint256 initialEthBalance = address(this).balance;

        // Make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokensToSwap,
            0, // Accept any amount of ETH
            path,
            address(this),
            block.timestamp + 300 // 5 minutes deadline
        );

        // Calculate the actual ETH received
        uint256 newBalance = address(this).balance;
        uint256 ethReceived = newBalance.sub(initialEthBalance);

        // Split ETH for wallets and liquidity
        uint256 ethForLiquidity = ethReceived.mul(liquidityShare).div(
            SHARE_DENOMINATOR
        );
        uint256 ethForDistribution = ethReceived.sub(ethForLiquidity);

        // Only add liquidity if we have tokens and ETH for it
        if (tokensForLiquidity > 0 && ethForLiquidity > 0) {
            // Approve tokens for liquidity
            _approve(
                address(this),
                address(uniswapV2Router),
                tokensForLiquidity
            );

            // Add liquidity
            uniswapV2Router.addLiquidityETH{value: ethForLiquidity}(
                address(this),
                tokensForLiquidity,
                0, // Accept any amount of tokens
                0, // Accept any amount of ETH
                owner(),
                block.timestamp + 300 // 5 minutes deadline
            );

            emit LiquidityAdded(tokensForLiquidity, ethForLiquidity);
        }

        // Distribute remaining ETH if any
        if (ethForDistribution > 0) {
            uint256 marketingPortion = ethForDistribution
                .mul(marketingShare)
                .div(marketingShare.add(devShare));
            uint256 devPortion = ethForDistribution.sub(marketingPortion);

            // Forward ETH to marketing wallet
            (bool marketingSuccess, ) = payable(marketingWallet).call{
                value: marketingPortion
            }("");
            require(
                marketingSuccess,
                "ETH transfer to marketing wallet failed"
            );

            // Forward ETH to dev wallet
            (bool devSuccess, ) = payable(devWallet).call{value: devPortion}(
                ""
            );
            require(devSuccess, "ETH transfer to dev wallet failed");
        }

        emit SwapAndLiquify(tokensToSwap, ethReceived, tokensForLiquidity);
    }

    /**
     * @dev Swap tokens for ETH and distribute
     */
    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] = uniswapV2Router.WETH();

        // Approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // Get initial ETH balance to ensure all funds are properly distributed
        uint256 initialEthBalance = address(this).balance;

        // Make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // Accept any amount of ETH
            path,
            address(this),
            block.timestamp + 300 // 5 minutes deadline
        );

        // Calculate the actual ETH received
        uint256 newBalance = address(this).balance;
        uint256 ethReceived = newBalance.sub(initialEthBalance);

        // Distribute the ETH - using a more secure pattern
        if (ethReceived > 0) {
            uint256 marketingPortion = ethReceived.mul(marketingShare).div(
                SHARE_DENOMINATOR
            );
            uint256 devPortion = ethReceived.mul(devShare).div(
                SHARE_DENOMINATOR
            );
            uint256 liquidityPortion = ethReceived.sub(marketingPortion).sub(
                devPortion
            );

            // Forward ETH to marketing wallet
            (bool marketingSuccess, ) = payable(marketingWallet).call{
                value: marketingPortion
            }("");
            require(
                marketingSuccess,
                "ETH transfer to marketing wallet failed"
            );

            // Forward ETH to dev wallet
            (bool devSuccess, ) = payable(devWallet).call{value: devPortion}(
                ""
            );
            require(devSuccess, "ETH transfer to dev wallet failed");

            // Keep liquidity portion in contract for future use

            emit SwapAndLiquify(tokenAmount, ethReceived, 0);
        }
    }

    /**
     * @dev Set timelock duration, can be set to 0
     */
    function setTimeLockDuration(uint256 newDuration) external onlyOwner {
        // Modified to allow setting timelock to 0
        require(newDuration <= 30 days, "Duration cannot exceed 30 days");
        timeLockDuration = newDuration;
        emit TimeLockDurationChanged(newDuration);
    }

    /**
     * @dev Add liquidity manually
     */
    function addLiquidity(uint256 tokenAmount) external payable onlyOwner {
        require(tokenAmount > 0, "Token amount must be greater than zero");
        require(msg.value > 0, "ETH amount must be greater than zero");

        // Transfer tokens from sender to contract if needed
        if (
            address(this) != msg.sender &&
            balanceOf(address(this)) < tokenAmount
        ) {
            // Check if sender has enough tokens
            require(
                balanceOf(msg.sender) >= tokenAmount,
                "Insufficient token balance"
            );

            // Mark the swapping flag to bypass fee logic in _transfer
            swapping = true;

            // Transfer tokens to contract
            super._transfer(msg.sender, address(this), tokenAmount);

            // Reset swapping flag
            swapping = false;
        }

        // Properly approve the router to spend tokens from the contract
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // Add the liquidity with reasonable slippage protection
        uint256 minTokenAmount = tokenAmount.mul(95).div(100); // 5% slippage
        uint256 minEthAmount = msg.value.mul(95).div(100); // 5% slippage

        // Add the liquidity
        uniswapV2Router.addLiquidityETH{value: msg.value}(
            address(this),
            tokenAmount,
            minTokenAmount,
            minEthAmount,
            owner(),
            block.timestamp + 600 // 10 minutes
        );

        emit LiquidityAdded(tokenAmount, msg.value);
    }

    // ===== OWNER FUNCTIONS =====

    /**
     * @dev Enable trading - cannot be reversed for security
     */
    function enableTrading() external onlyOwner {
        require(!tradingEnabled, "Trading is already enabled");
        tradingEnabled = true;
        emit TradingEnabled();
    }

    /**
     * @dev Toggle between token distribution and ETH distribution
     */
    function toggleTokenDistribution(bool enabled) external onlyOwner {
        tokenDistributionEnabled = enabled;
        emit TokenDistributionToggled(enabled);
    }

    /**
     * @dev Toggle auto liquidity generation
     */
    function toggleAutoLiquidity(bool enabled) external onlyOwner {
        autoLiquidityEnabled = enabled;
        emit AutoLiquidityToggled(enabled);
    }

    /**
     * @dev Set distribution shares
     */
    function setDistributionShares(
        uint256 _marketingShare,
        uint256 _devShare,
        uint256 _liquidityShare
    ) external onlyOwner {
        require(
            _marketingShare + _devShare + _liquidityShare == SHARE_DENOMINATOR,
            "Shares must add up to 100"
        );
        marketingShare = _marketingShare;
        devShare = _devShare;
        liquidityShare = _liquidityShare;
    }

    /**
     * @dev Emergency pause for critical situations
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev Resume normal operations after pause
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Set threshold for auto-swapping
     */
    function setSwapTokensAtAmount(uint256 newAmount) external onlyOwner {
        require(newAmount > 0, "Amount must be greater than zero");
        swapTokensAtAmount = newAmount;
    }

    /**
     * @dev Set max tokens that can accumulate before swap
     */
    function setMaxTokensInContract(uint256 newAmount) external onlyOwner {
        require(
            newAmount > TOTAL_SUPPLY.div(1000),
            "Cannot be lower than 0.1% of supply"
        );
        require(
            newAmount <= TOTAL_SUPPLY.div(20),
            "Cannot exceed 5% of supply"
        );
        maxTokensInContract = newAmount;
    }

    /**
     * @dev Set max transaction amount
     */
    function setMaxTxAmount(uint256 newAmount) external onlyOwner {
        require(
            newAmount >= TOTAL_SUPPLY.div(1000),
            "Cannot be lower than 0.1% of supply"
        );
        maxTxAmount = newAmount;
        emit SetMaxTxAmount(newAmount);
    }

    /**
     * @dev Manually process collected taxes
     */
    function processTaxes() external onlyOwner {
        uint256 tokenBalance = balanceOf(address(this));
        require(tokenBalance > 0, "No tokens to process");

        swapping = true;
        if (autoLiquidityEnabled) {
            uint256 tokensForLiquidity = tokenBalance.mul(liquidityShare).div(
                SHARE_DENOMINATOR
            );
            uint256 tokensToSwap = tokenBalance.sub(tokensForLiquidity);

            if (tokensToSwap > 0) {
                swapAndLiquify(tokensToSwap, tokensForLiquidity);
            }
        } else {
            swapTokensForEth(tokenBalance);
        }
        swapping = false;
    }

    /**
     * @dev Update router address (in case of Uniswap upgrades or issues)
     */
    function updateUniswapRouter(address newRouter) external onlyOwner {
        require(newRouter != address(0), "New router cannot be zero address");

        // Store old pair for reference
        address oldPair = uniswapV2Pair;

        // Update router
        uniswapV2Router = IUniswapV2Router02(newRouter);

        // Create new pair
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
                address(this),
                uniswapV2Router.WETH()
            );

        // Update exclusions for new pair
        isExcludedFromMaxWallet[uniswapV2Pair] = true;
        isExcludedFromMaxTx[uniswapV2Pair] = true;

        emit UpdatedUniswapRouter(newRouter, uniswapV2Pair);
    }

    /**
     * @dev Add or remove address from blacklist
     */
    function blacklistAddress(
        address account,
        bool blacklisted
    ) external onlyOwner {
        require(account != address(0), "Cannot blacklist zero address");
        require(account != owner(), "Cannot blacklist owner");
        isBlacklisted[account] = blacklisted;
        emit AddressBlacklisted(account, blacklisted);
    }

    /**
     * @dev Burn tokens from caller's address
     */
    function burn(uint256 amount) external {
        require(amount > 0, "Amount must be greater than zero");
        require(balanceOf(msg.sender) >= amount, "Insufficient balance");
        _burn(msg.sender, amount);
        emit TokensBurned(msg.sender, amount);
    }

    /**
     * @dev Mint additional tokens (only before trading is enabled)
     */
    function mint(address to, uint256 amount) external onlyOwner {
        require(!tradingEnabled, "Cannot mint after trading is enabled");
        require(to != address(0), "Cannot mint to zero address");
        require(amount > 0, "Amount must be greater than zero");
        _mint(to, amount);
        emit TokensMinted(to, amount);
    }

    // ===== TIMELOCK FUNCTIONS =====

    /**
     * @dev Create a timelock for a function
     */
    function _createTimelock(bytes32 functionId) private {
        uint256 releaseTime = block.timestamp + timeLockDuration;
        _timeLocks[functionId] = releaseTime;
        emit TimelockCreated(functionId, releaseTime);
    }

    /**
     * @dev Check if a timelock is ready
     */
    function _isTimelockReady(bytes32 functionId) private view returns (bool) {
        uint256 releaseTime = _timeLocks[functionId];
        return releaseTime != 0 && block.timestamp >= releaseTime;
    }

    /**
     * @dev Clear a timelock
     */
    function _clearTimelock(bytes32 functionId) private {
        _timeLocks[functionId] = 0;
    }

    /**
     * @dev Cancel a pending timelock
     */
    function cancelTimelock(bytes32 functionId) external onlyOwner {
        require(_timeLocks[functionId] != 0, "Timelock does not exist");
        _clearTimelock(functionId);
        emit TimelockCancelled(functionId);
    }

    /**
     * @dev Get release time for a timelock
     */
    function getTimelockReleaseTime(
        bytes32 functionId
    ) external view returns (uint256) {
        return _timeLocks[functionId];
    }

    // ===== TAX FUNCTIONS =====

    /**
     * @dev Initiate timelock for buy tax change
     */
    function initiateBuyTaxChange(uint256 newTax) external onlyOwner {
        require(newTax <= MAX_TAX, "Tax cannot exceed maximum allowed");
        bytes32 functionId = keccak256(abi.encodePacked("setBuyTax", newTax));
        _createTimelock(functionId);
    }

    /**
     * @dev Set buy tax after timelock
     */
    function confirmBuyTaxChange(uint256 newTax) external onlyOwner {
        bytes32 functionId = keccak256(abi.encodePacked("setBuyTax", newTax));
        require(_isTimelockReady(functionId), "Timelock not ready");

        buyTax = newTax;
        _clearTimelock(functionId);
        emit SetBuyTax(newTax);
    }

    /**
     * @dev Initiate timelock for sell tax change
     */
    function initiateSellTaxChange(uint256 newTax) external onlyOwner {
        require(newTax <= MAX_TAX, "Tax cannot exceed maximum allowed");
        bytes32 functionId = keccak256(abi.encodePacked("setSellTax", newTax));
        _createTimelock(functionId);
    }

    /**
     * @dev Set sell tax after timelock
     */
    function confirmSellTaxChange(uint256 newTax) external onlyOwner {
        bytes32 functionId = keccak256(abi.encodePacked("setSellTax", newTax));
        require(_isTimelockReady(functionId), "Timelock not ready");

        sellTax = newTax;
        _clearTimelock(functionId);
        emit SetSellTax(newTax);
    }

    /**
     * @dev Initiate timelock for transfer tax change
     */
    function initiateTransferTaxChange(uint256 newTax) external onlyOwner {
        require(newTax <= MAX_TAX, "Tax cannot exceed maximum allowed");
        bytes32 functionId = keccak256(
            abi.encodePacked("setTransferTax", newTax)
        );
        _createTimelock(functionId);
    }

    /**
     * @dev Set transfer tax after timelock
     */
    function confirmTransferTaxChange(uint256 newTax) external onlyOwner {
        bytes32 functionId = keccak256(
            abi.encodePacked("setTransferTax", newTax)
        );
        require(_isTimelockReady(functionId), "Timelock not ready");

        transferTax = newTax;
        _clearTimelock(functionId);
        emit SetTransferTax(newTax);
    }

    // ===== WALLET CONFIGURATION =====

    /**
     * @dev Change admin wallet - extends OpenZeppelin's transferOwnership with additional functionality
     */
    function changeAdmin(address newAdmin) external onlyOwner {
        require(newAdmin != address(0), "New admin cannot be zero address");
        address previousAdmin = owner();

        // First, make sure the new admin is excluded from fees and max wallet
        isExcludedFromFees[newAdmin] = true;
        isExcludedFromMaxWallet[newAdmin] = true;
        isExcludedFromMaxTx[newAdmin] = true;

        // Transfer ownership (from OpenZeppelin's Ownable)
        transferOwnership(newAdmin);

        emit AdminChanged(previousAdmin, newAdmin);
    }

    /**
     * @dev Override renounceOwnership to prevent accidental ownership renouncement
     */
    function renounceOwnership() public override onlyOwner {
        // Create a timelock for renouncing ownership
        bytes32 functionId = keccak256(abi.encodePacked("renounceOwnership"));

        // Check if the timelock exists and is ready
        if (!_isTimelockReady(functionId)) {
            // Create a timelock if it doesn't exist or isn't ready
            _createTimelock(functionId);
            return;
        }

        // If timelock is ready, renounce ownership
        _clearTimelock(functionId);
        super.renounceOwnership();
    }
}

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