Contract Address Details

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * 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);
    }
}
        

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
          

pragma solidity >=0.5.0;

interface IPancakeFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

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

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}
          

pragma solidity >=0.5.0;

interface IPancakePair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}
          

pragma solidity >=0.6.2;

interface IPancakeRouter01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/draft-IERC6093.sol)
pragma solidity >=0.8.4;

/**
 * @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);
}

/**
 * @dev Standard ERC-721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in ERC-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC-1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @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.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.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}.
     *
     * Both 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;
    }

    /// @inheritdoc IERC20
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /// @inheritdoc IERC20
    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;
    }

    /// @inheritdoc IERC20
    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);
            }
        }
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @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);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.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);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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 v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }
}
          

pragma solidity >=0.6.2;

import './IPancakeRouter01.sol';

interface IPancakeRouter02 is IPancakeRouter01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
          

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/*
 ███████╗██╗   ██╗████████╗██████╗  ██████╗ ██╗     ██████╗ ██████╗  █████╗ ██╗    ██╗██╗     
 ██╔════╝██║   ██║╚══██╔══╝██╔══██╗██╔═══██╗██║     ██╔══██╗██╔══██╗██╔══██╗██║    ██║██║     
 █████╗  ██║   ██║   ██║   ██████╔╝██║   ██║██║     ██████╔╝██████╔╝███████║██║ █╗ ██║██║     
 ██╔══╝  ██║   ██║   ██║   ██╔══██╗██║   ██║██║     ██╔══██╗██╔══██╗██╔══██║██║███╗██║██║     
 ██║     ╚██████╔╝   ██║   ██████╔╝╚██████╔╝███████╗██████╔╝██║  ██║██║  ██║╚███╔███╔╝███████╗
 ╚═╝      ╚═════╝    ╚═╝   ╚═════╝  ╚═════╝ ╚══════╝╚═════╝ ╚═╝  ╚═╝╚═╝  ╚═╝ ╚══╝╚══╝ ╚══════╝
                                    F U T B O L B R A W L
*/

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "pancake-swap-core/interfaces/IPancakeFactory.sol";
import "pancake-swap-core/interfaces/IPancakePair.sol";
import "pancake-swap-periphery/interfaces/IPancakeRouter02.sol";
import "../interfaces/GoalToken/IGoalToken.sol";

/**
 * @title GoalToken v2
 * @dev ERC-20 token for FutbolBrawl with deflationary mechanics and LP tax system
 * @notice Implements IGoalToken interface (implicitly, no inheritance)
 *
 * FEATURES:
 * - Buy/sell taxes (4.7% buy, 16.6% sell by default)
 * - Timelock governance for tax changes (48h delay)
 * - Deflationary burn mechanics via authorized burners
 * - LP auto-detection with factory verification
 * - Bulk transfer operations
 *
 * CRITICAL FIXES v2:
 * - Fixed: _update now allows mint/burn operations (CRITICAL - was blocking deployment)
 * - Fixed: setRouterAddress updates factory (sync issue)
 * - Fixed: transferOwnership removes old owner from exclusion list
 * - Fixed: Separated interface from implementation (cleaner architecture)
 *
 * @custom:security-contact security@futbolbrawl.com
 */
contract GoalToken is ERC20, Ownable, ReentrancyGuard, IGoalToken {
    using SafeERC20 for IERC20;

    // ───────────────────────────── Constants ─────────────────────────────
    uint256 public constant MAX_BUY_TAX = 100;
    uint256 public constant MAX_SELL_TAX = 200;
    uint256 public constant MAX_BULK_TRANSFER = 200;
    uint256 public constant TIMELOCK_DURATION = 48 hours;
    uint256 public constant TAX_DENOMINATOR = 1000;

    // ───────────────────────────── State Variables ─────────────────────────────
    IPancakeRouter02 public router;
    IPancakeFactory public factory;
    address public vaultAddr;

    uint256 public buyTax;
    uint256 public sellTax;

    mapping(address => bool) public isLp;
    mapping(address => bool) public isVerifiedLp;
    mapping(address => bool) public excludedFromFee;

    mapping(bytes32 => IGoalToken.Proposal) internal proposals;
    uint256 public proposalNonce;

    error TransferToZeroAddress();

    // ───────────────────────────── Constructor ─────────────────────────────
    /**
     * @dev Initialize GoalToken with initial configuration
     * @param _vaultAddr Address to receive swapped BNB
     * @param routerAddress PancakeSwap router address (can be address(0) if no DEX available)
     * @param _buyTax Initial buy tax in per-mille (1000 = 100%)
     * @param _sellTax Initial sell tax in per-mille (1000 = 100%)
     * @notice If routerAddress is address(0), swapToVault() will not work until configured
     * @notice Taxes can be changed after deployment via timelock (48h delay)
     */
    constructor(
        address _vaultAddr,
        address routerAddress,
        uint256 _buyTax,
        uint256 _sellTax
    ) ERC20("GOAL Token", "GOAL") Ownable(msg.sender) {
        if (_vaultAddr == address(0)) revert IGoalToken.ZeroAddress();
        if (_buyTax > MAX_BUY_TAX) revert IGoalToken.TaxExceedsMaximum();
        if (_sellTax > MAX_SELL_TAX) revert IGoalToken.TaxExceedsMaximum();

        vaultAddr = _vaultAddr;

        // Router is optional (for chains without compatible DEX)
        if (routerAddress != address(0)) {
            IPancakeRouter02 _router = IPancakeRouter02(routerAddress);
            router = _router;
            factory = IPancakeFactory(_router.factory());
            excludedFromFee[address(router)] = true;
        }

        buyTax = _buyTax;
        sellTax = _sellTax;

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

        // Mint initial supply (1B tokens)
        _mint(msg.sender, 1000000000 * 10 ** 18);
    }

    // ───────────────────────────── Admin Functions ─────────────────────────────

    /**
     * @dev Set vault address for fee collection
     * @param addr New vault address
     */
    function setVaultAddress(address addr) external onlyOwner {
        if (addr == address(0)) revert IGoalToken.ZeroAddress();

        address oldVault = vaultAddr;
        vaultAddr = addr;

        emit VaultAddressChanged(oldVault, addr);
    }

    /**
     * @dev Set router address for DEX interactions
     * @param addr New router address
     * @notice Automatically updates factory and fee exclusions
     */
    function setRouterAddress(address addr) external onlyOwner {
        if (addr == address(0)) revert IGoalToken.ZeroAddress();

        address oldRouter = address(router);

        if (oldRouter != address(0) && excludedFromFee[oldRouter]) {
            excludedFromFee[oldRouter] = false;
            emit FeeExclusionUpdated(oldRouter, false);
        }

        IPancakeRouter02 newRouter = IPancakeRouter02(addr);
        router = newRouter;
        factory = IPancakeFactory(newRouter.factory());

        excludedFromFee[addr] = true;
        emit FeeExclusionUpdated(addr, true);

        emit RouterAddressChanged(oldRouter, addr);
    }

    /**
     * @dev Transfer ownership and update fee exclusions
     * @param newOwner Address of new owner
     * @notice Removes old owner from exclusion list and adds new owner
     */
    function transferOwnership(address newOwner) public override onlyOwner {
        if (newOwner == address(0)) revert IGoalToken.ZeroAddress();

        address oldOwner = owner();

        if (excludedFromFee[oldOwner]) {
            excludedFromFee[oldOwner] = false;
            emit FeeExclusionUpdated(oldOwner, false);
        }

        excludedFromFee[newOwner] = true;
        emit FeeExclusionUpdated(newOwner, true);

        super.transferOwnership(newOwner);
    }

    /**
     * @dev Manually set LP address
     * @param addr LP contract address
     * @param value Whether it's an LP
     */
    function setLP(address addr, bool value) external onlyOwner {
        if (addr == address(0)) revert IGoalToken.ZeroAddress();
        isLp[addr] = value;
        emit LPFlagUpdated(addr, value);
    }

    /**
     * @dev Verify and register LP from factory
     * @param tokenA First token address
     * @param tokenB Second token address
     * @notice Reverts if factory is not configured
     */
    function verifyAndRegisterLP(address tokenA, address tokenB) external onlyOwner {
        if (address(factory) == address(0)) revert IGoalToken.ZeroAddress();
        address pair = factory.getPair(tokenA, tokenB);
        if (pair == address(0)) revert IGoalToken.PairNotFound();

        isVerifiedLp[pair] = true;
        emit LPVerified(pair, tokenA, tokenB);
    }

    /**
     * @dev Auto-register main LP pair (GOAL/WETH)
     * @notice Reverts if router/factory is not configured
     */
    function registerMainLPPair() external onlyOwner {
        if (address(router) == address(0)) revert IGoalToken.ZeroAddress();
        if (address(factory) == address(0)) revert IGoalToken.ZeroAddress();
        address weth = router.WETH();
        address pair = factory.getPair(address(this), weth);
        if (pair != address(0)) {
            isVerifiedLp[pair] = true;
            emit LPVerified(pair, address(this), weth);
        }
    }

    /**
     * @dev Exclude/include address from trading fees
     * @param addr Address to modify
     * @param value Whether to exclude from fees
     */
    function excludeFromFee(address addr, bool value) external onlyOwner {
        if (addr == address(0)) revert IGoalToken.ZeroAddress();
        excludedFromFee[addr] = value;
        emit FeeExclusionUpdated(addr, value);
    }

    /**
     * @dev Propose a tax change with 48-hour timelock
     * @param _buyTax New buy tax in per-mille (1000 = 100%)
     * @param _sellTax New sell tax in per-mille (1000 = 100%)
     */
    function proposeTaxChange(uint256 _buyTax, uint256 _sellTax) external onlyOwner {
        if (_buyTax > MAX_BUY_TAX) revert IGoalToken.TaxExceedsMaximum();
        if (_sellTax > MAX_SELL_TAX) revert IGoalToken.TaxExceedsMaximum();

        bytes32 proposalId = keccak256(abi.encode(_buyTax, _sellTax, proposalNonce, msg.sender));
        proposalNonce++;

        proposals[proposalId] =
            Proposal({timestamp: block.timestamp, executed: false, newBuyTax: _buyTax, newSellTax: _sellTax});

        emit ProposalCreated(proposalId, block.timestamp, _buyTax, _sellTax);
        emit TaxChangeProposed(proposalId, _buyTax, _sellTax, block.timestamp + TIMELOCK_DURATION);
    }

    /**
     * @dev Execute a tax change after timelock expires
     * @param proposalId Proposal ID to execute
     */
    function executeTaxChange(bytes32 proposalId) external onlyOwner {
        IGoalToken.Proposal storage proposal = proposals[proposalId];
        if (proposal.timestamp == 0) revert IGoalToken.ProposalDoesNotExist();
        if (proposal.executed) revert IGoalToken.ProposalAlreadyExecuted();
        if (block.timestamp < proposal.timestamp + TIMELOCK_DURATION) revert IGoalToken.TimelockNotExpired();

        proposal.executed = true;

        uint256 oldBuyTax = buyTax;
        uint256 oldSellTax = sellTax;

        buyTax = proposal.newBuyTax;
        sellTax = proposal.newSellTax;

        emit TaxUpdated(oldBuyTax, oldSellTax, proposal.newBuyTax, proposal.newSellTax);
    }

    /**
     * @dev Clean up executed proposals
     * @param proposalIds Array of proposal IDs to clean up
     */
    function cleanupExecutedProposals(bytes32[] calldata proposalIds) external onlyOwner {
        for (uint256 i = 0; i < proposalIds.length; i++) {
            bytes32 proposalId = proposalIds[i];
            IGoalToken.Proposal storage proposal = proposals[proposalId];
            if (proposal.executed) {
                delete proposals[proposalId];
                emit ProposalCleaned(proposalId);
            }
        }
    }

    // ───────────────────────────── Transfer Logic ─────────────────────────────

    /**
     * @dev Override transfer to implement tax logic
     * @param from Sender address
     * @param to Recipient address
     * @param amount Amount to transfer
     *
     * @notice Allows mint (from=0) and burn (to=0) without tax logic
     */
    function _update(address from, address to, uint256 amount) internal override {
        if (from == address(0) || to == address(0)) {
            super._update(from, to, amount);
            return;
        }

        bool isBuy = _isLPToken(from) && !excludedFromFee[to];
        bool isSell = _isLPToken(to) && !excludedFromFee[from];

        if (isBuy) {
            uint256 fee = (amount * buyTax) / TAX_DENOMINATOR;
            super._update(from, to, amount - fee);
            super._update(from, address(this), fee);
            emit AccumulatedFee(to, from, fee, true);
        } else if (isSell) {
            uint256 fee = (amount * sellTax) / TAX_DENOMINATOR;
            super._update(from, to, amount - fee);
            super._update(from, address(this), fee);
            emit AccumulatedFee(from, to, fee, false);
        } else {
            super._update(from, to, amount);
        }
    }

    /**
     * @dev Checks if an address is a verified liquidity pool
     * @param addr Address to check
     * @return Whether the address is a verified LP
     */
    function _isLPToken(address addr) internal view returns (bool) {
        if (addr.code.length == 0) return false;

        if (isLp[addr]) return true;

        if (isVerifiedLp[addr]) return true;

        return false;
    }

    // ───────────────────────────── Burning Functions ─────────────────────────────

    /**
     * @dev Burns tokens from sender's balance
     * @param amount Amount to burn
     */
    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
        emit TokensBurned(msg.sender, amount);
    }

    /**
     * @dev Burns tokens from an approved account
     * @param account Address to burn from
     * @param amount Amount to burn
     */
    function burnFrom(address account, uint256 amount) external {
        uint256 currentAllowance = allowance(account, msg.sender);
        if (currentAllowance < amount) revert IGoalToken.BurnAmountExceedsAllowance();

        _approve(account, msg.sender, currentAllowance - amount);
        _burn(account, amount);
        emit TokensBurned(account, amount);
    }

    // ───────────────────────────── Swap Functions ─────────────────────────────

    /**
     * @dev Receive BNB from swaps
     */
    receive() external payable {}

    /**
     * @dev Swap accumulated fees to BNB and send to vault
     * @param minBNBOut Minimum BNB output for slippage protection
     * @notice Implements IGoalToken.swapToVault(uint256)
     * @notice Reverts if router is not configured (address(0))
     */
    function swapToVault(uint256 minBNBOut) external nonReentrant {
        if (address(router) == address(0)) revert IGoalToken.ZeroAddress();
        uint256 amount = balanceOf(address(this));
        if (amount == 0) revert IGoalToken.NothingToSwap();

        _approve(address(this), address(router), amount);

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

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amount, minBNBOut, path, address(this), block.timestamp + 300
        );

        uint256 bnbReceived = address(this).balance - balanceBefore;

        (bool success,) = payable(vaultAddr).call{value: bnbReceived}("");
        require(success, "GoalToken: BNB transfer to vault failed");

        emit SwappedToVault(amount, bnbReceived);
    }

    /**
     * @dev Legacy swap function without slippage protection
     * @notice Implements IGoalToken.swapToVault()
     * @notice Reverts if router is not configured (address(0))
     */
    function swapToVault() external nonReentrant {
        if (address(router) == address(0)) revert IGoalToken.ZeroAddress();
        uint256 amount = balanceOf(address(this));
        if (amount == 0) revert IGoalToken.NothingToSwap();

        _approve(address(this), address(router), amount);

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

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(amount, 0, path, address(this), block.timestamp + 300);

        uint256 bnbReceived = address(this).balance - balanceBefore;

        (bool success,) = payable(vaultAddr).call{value: bnbReceived}("");
        require(success, "GoalToken: BNB transfer to vault failed");

        emit SwappedToVault(amount, bnbReceived);
    }

    // ───────────────────────────── Bulk Operations ─────────────────────────────

    /**
     * @dev Transfer tokens to multiple addresses
     * @param accounts Array of recipient addresses
     * @param amounts Array of amounts to transfer
     *
     * @notice ATOMIC: Either ALL transfers succeed or ALL revert (no partial execution)
     * @notice REVERTS if any recipient is an LP (prevents unexpected fees)
     * @notice REVERTS if insufficient balance for total amount (prevents partial transfers)
     */
    function bulkTransfer(address[] calldata accounts, uint256[] calldata amounts) external {
        if (accounts.length != amounts.length) revert IGoalToken.LengthMismatch();
        if (accounts.length > MAX_BULK_TRANSFER) revert IGoalToken.ExceedsMaxBulkTransfer();
        if (accounts.length == 0) revert IGoalToken.EmptyArrays();

        uint256 totalAmount;
        for (uint256 i = 0; i < amounts.length; i++) {
            totalAmount += amounts[i];
        }
        if (balanceOf(msg.sender) < totalAmount) revert IGoalToken.InsufficientBalanceForBulkTransfer();

        for (uint256 i = 0; i < accounts.length; i++) {
            if (accounts[i] == address(0)) revert TransferToZeroAddress();

            if (_isLPToken(accounts[i])) {
                revert IGoalToken.BulkTransferToLPNotAllowed();
            }
        }

        for (uint256 i = 0; i < accounts.length; i++) {
            transfer(accounts[i], amounts[i]);
        }

        emit BulkTransferCompleted(msg.sender, accounts.length);
    }

    // ───────────────────────────── View Functions (IGoalToken) ─────────────────────────────

    /**
     * @notice Implements IGoalToken.getBuyTax
     */
    function getBuyTax() external view returns (uint256) {
        return buyTax;
    }

    /**
     * @notice Implements IGoalToken.getSellTax
     */
    function getSellTax() external view returns (uint256) {
        return sellTax;
    }

    /**
     * @notice Implements IGoalToken.getAccumulatedFees
     */
    function getAccumulatedFees() external view returns (uint256) {
        return balanceOf(address(this));
    }

    /**
     * @dev Get proposal details
     */
    function getProposal(bytes32 proposalId) external view returns (IGoalToken.Proposal memory) {
        return proposals[proposalId];
    }

    /**
     * @dev Check if proposal can be executed
     */
    function canExecuteProposal(bytes32 proposalId) external view returns (bool) {
        IGoalToken.Proposal storage proposal = proposals[proposalId];
        return proposal.timestamp > 0 && !proposal.executed && block.timestamp >= proposal.timestamp + TIMELOCK_DURATION;
    }

    /**
     * @dev Get next proposal nonce
     */
    function getNextProposalNonce() external view returns (uint256) {
        return proposalNonce;
    }

    /**
     * @dev Get contract version
     */
    function version() external pure returns (string memory) {
        return "GoalToken v1";
    }
}
          

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

/**
 * @title IGoalToken
 * @dev Interface for GoalToken - Used by external contracts (Treasury, Game) to interact with GoalToken
 * @notice This interface only declares external functions that other contracts need to call
 */
interface IGoalToken {
    // ───────────────────────────── Structs ─────────────────────────────

    struct Proposal {
        uint256 timestamp;
        bool executed;
        uint256 newBuyTax;
        uint256 newSellTax;
    }

    // ───────────────────────────── Events ─────────────────────────────

    event VaultAddressChanged(address indexed oldVault, address indexed newVault);
    event RouterAddressChanged(address indexed oldRouter, address indexed newRouter);
    event FeeExclusionUpdated(address indexed account, bool excluded);
    event LPFlagUpdated(address indexed pair, bool isLp);
    event LPVerified(address indexed pair, address indexed tokenA, address indexed tokenB);
    event TaxChangeProposed(bytes32 indexed proposalId, uint256 buyTax, uint256 sellTax, uint256 executeAfter);
    event ProposalCreated(bytes32 indexed proposalId, uint256 timestamp, uint256 buyTax, uint256 sellTax);
    event ProposalCleaned(bytes32 indexed proposalId);
    event TaxUpdated(uint256 oldBuyTax, uint256 oldSellTax, uint256 newBuyTax, uint256 newSellTax);
    event AccumulatedFee(address indexed payer, address indexed counterparty, uint256 amount, bool isBuy);
    event TokensBurned(address indexed account, uint256 amount);
    event SwappedToVault(uint256 tokensSwapped, uint256 bnbReceived);
    event BulkTransferCompleted(address indexed sender, uint256 count);

    // ───────────────────────────── Errors ─────────────────────────────

    error ZeroAddress();
    error TaxExceedsMaximum();
    error ProposalDoesNotExist();
    error ProposalAlreadyExecuted();
    error TimelockNotExpired();
    error BurnAmountExceedsAllowance();
    error NothingToSwap();
    error LengthMismatch();
    error ExceedsMaxBulkTransfer();
    error EmptyArrays();
    error PairNotFound();
    error BulkTransferToLPNotAllowed();
    error InsufficientBalanceForBulkTransfer();

    // ───────────────────────────── Burning Functions ─────────────────────────────

    /**
     * @dev Burns tokens from sender's balance
     * @param amount Amount to burn
     */
    function burn(uint256 amount) external;

    /**
     * @dev Burns tokens from an approved account
     * @param account Address to burn from
     * @param amount Amount to burn
     * @notice Requires prior approval via approve()
     */
    function burnFrom(address account, uint256 amount) external;

    // ───────────────────────────── View Functions ─────────────────────────────

    /**
     * @dev Get current buy tax rate
     * @return Buy tax in per-mille (1000 = 100%)
     */
    function getBuyTax() external view returns (uint256);

    /**
     * @dev Get current sell tax rate
     * @return Sell tax in per-mille (1000 = 100%)
     */
    function getSellTax() external view returns (uint256);

    /**
     * @dev Get accumulated fees in the contract
     * @return Amount of accumulated fees
     */
    function getAccumulatedFees() external view returns (uint256);

    /**
     * @dev Check if an address is excluded from fees
     * @param account Address to check
     * @return Whether the address is excluded from fees
     */
    function excludedFromFee(address account) external view returns (bool);

    // ───────────────────────────── Swap Functions ─────────────────────────────

    /**
     * @dev Swap accumulated fees to BNB and send to vault
     */
    function swapToVault() external;

    /**
     * @dev Swap accumulated fees to BNB with slippage protection
     * @param minBNBOut Minimum BNB output expected
     */
    function swapToVault(uint256 minBNBOut) external;
}