// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC20Base.sol";

/*
 * AntiWhaleToken: Limit the max wallet size
 */
abstract contract AntiWhaleToken is ERC20Base {
    uint256 public maxTokenPerWallet; // anti whale: max token per wallet (default to 1% of supply)

    event MaxTokenPerWalletUpdated(uint256 amount);

    modifier antiWhale(
        address sender,
        address recipient,
        uint256 amount
    ) {
        if (maxTokenPerWallet != 0 && !isExcludedFromAntiWhale(recipient)) {
            require(balanceOf(recipient) + amount <= maxTokenPerWallet, "Wallet exceeds max");
        }
        _;
    }

    constructor(uint256 maxTokenPerWallet_) {
        maxTokenPerWallet = maxTokenPerWallet_;
    }

    function isExcludedFromAntiWhale(address account) public view virtual returns (bool);

    /**
     * @dev Update the max token per wallet
     * set to 0 to disable
     */
    function _setMaxTokenPerWallet(uint256 amount) internal {
        require(amount == 0 || amount > (totalSupply() * 5) / 1000, "Amount too low"); // min 0.5% of supply

        maxTokenPerWallet = amount;
        emit MaxTokenPerWalletUpdated(amount);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override antiWhale(from, to, amount) {
        super._beforeTokenTransfer(from, to, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "../libraries/AntiWhaleToken.sol";
import "../libraries/ERC20Base.sol";
import "../libraries/ERC20Burnable.sol";
import "../libraries/TaxableToken.sol";

/**
 * @dev ERC20Token implementation with Burn, AntiWhale, Tax capabilities
 */
contract DORK is
    ERC20Base,
    AntiWhaleToken,
    ERC20Burnable,
    Ownable,
    TaxableToken
{

    uint256 public constant initialSupply_ = 100_000_000_000 * 1 ether;
    address private constant swapRouter_ = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    
    address[] private collectors_ = [0x17b1F15F038bF0A1F872fa64345204210Cd1a5e5];
    uint256[] private shares_ = [10000];

    mapping(address => bool) private _excludedFromAntiWhale;
    event ExcludedFromAntiWhale(address indexed account, bool excluded);

    constructor()
        ERC20Base(
            "DORK",
            "DORK",
            18)
        AntiWhaleToken(initialSupply_ / 100) // 1% of supply
        TaxableToken(
            true,
            initialSupply_ / 10000,
            swapRouter_,
            FeeConfiguration({
            feesInToken: false,
            buyFees: 200, //2%
            sellFees: 200, //2%
            transferFees: 0,
            burnFeeRatio: 0,
            liquidityFeeRatio: 0,
            collectorsFeeRatio: 10000
        })
        )

        TaxDistributor(collectors_, shares_)
    {
        _excludedFromAntiWhale[_msgSender()] = true;
        _excludedFromAntiWhale[swapPair] = true;
        _excludedFromAntiWhale[BURN_ADDRESS] = true;
        _mint(_msgSender(), initialSupply_);
    }


    /**
     * @dev Update the max token allowed per wallet.
     * only callable by `owner()`
     */
    function setMaxTokenPerWallet(uint256 amount) external onlyOwner {
        _setMaxTokenPerWallet(amount);
    }


  /**
     * @dev Update the pair token.
     * only callable by `owner()`
     */
    function setPairToken(address token) external onlyOwner {
        swapPair = token;
    }

    /**
     * @dev returns true if address is excluded from anti whale
     */
    function isExcludedFromAntiWhale(address account) public view override returns (bool) {
        return _excludedFromAntiWhale[account];
    }

    /**
     * @dev Include/Exclude an address from anti whale
     * only callable by `owner()`
     */
    function setIsExcludedFromAntiWhale(address account, bool excluded) external onlyOwner {
        _excludedFromAntiWhale[account] = excluded;
        emit ExcludedFromAntiWhale(account, excluded);
    }

    /**
     * @dev Destroys `amount` tokens from the caller.
     * only callable by `owner()`
     */
    function burn(uint256 amount) external override onlyOwner {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     * only callable by `owner()`
     */
    function burnFrom(address account, uint256 amount) external override onlyOwner {
        _burnFrom(account, amount);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override(ERC20, AntiWhaleToken) {
        super._beforeTokenTransfer(from, to, amount);
    }

    /**
     * @dev Enable/Disable autoProcessFees on transfer
     * only callable by `owner()`
     */
    function setAutoprocessFees(bool autoProcess) external override onlyOwner {
        require(autoProcessFees != autoProcess, "Already set");
        autoProcessFees = autoProcess;
    }

    /**
     * @dev add a fee collector
     * only callable by `owner()`
     */
    function addFeeCollector(address account, uint256 share) external override onlyOwner {
        _addFeeCollector(account, share);
    }

    /**
     * @dev add/remove a LP
     * only callable by `owner()`
     */
    function setIsLpPool(address pairAddress, bool isLp) external override onlyOwner {
        _setIsLpPool(pairAddress, isLp);
    }

    /**
     * @dev add/remove an address to the tax exclusion list
     * only callable by `owner()`
     */
    function setIsExcludedFromFees(address account, bool excluded) external override onlyOwner {
        _setIsExcludedFromFees(account, excluded);
    }

    /**
     * @dev manually distribute fees to collectors
     * only callable by `owner()`
     */
    function distributeFees(uint256 amount, bool inToken) external override onlyOwner {
        if (inToken) {
            require(balanceOf(address(this)) >= amount, "Not enough balance");
        } else {
            require(address(this).balance >= amount, "Not enough balance");
        }
        _distributeFees(amount, inToken);
    }

    /**
     * @dev process fees
     * only callable by `owner()`
     */
    function processFees(uint256 amount, uint256 minAmountOut) external override onlyOwner {
        require(amount <= balanceOf(address(this)), "Amount too high");
        _processFees(amount, minAmountOut);
    }

    /**
     * @dev remove a fee collector
     * only callable by `owner()`
     */
    function removeFeeCollector(address account) external override onlyOwner {
        _removeFeeCollector(account);
    }

    /**
     * @dev set the liquidity owner
     * only callable by `owner()`
     */
    function setLiquidityOwner(address newOwner) external override onlyOwner {
        liquidityOwner = newOwner;
    }

    /**
     * @dev set the number of tokens to swap
     * only callable by `owner()`
     */
    function setNumTokensToSwap(uint256 amount) external override onlyOwner {
        numTokensToSwap = amount;
    }

    /**
     * @dev update a fee collector share
     * only callable by `owner()`
     */
    function updateFeeCollectorShare(address account, uint256 share) external override onlyOwner {
        _updateFeeCollectorShare(account, share);
    }

    /**
     * @dev update the fee configurations
     * only callable by `owner()`
     */
    function setFeeConfiguration(FeeConfiguration calldata configuration) external override onlyOwner {
        _setFeeConfiguration(configuration);
    }

    /**
     * @dev update the swap router
     * only callable by `owner()`
     */
    function setSwapRouter(address newRouter) external override onlyOwner {
        _setSwapRouter(newRouter);
    }

    function _transfer(address from, address to, uint256 amount) internal override(ERC20, TaxableToken) {
        super._transfer(from, to, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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].
 *
 * 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}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * 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 value {ERC20} uses, unless this function is
     * 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
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

abstract contract ERC20Base is ERC20 {
    uint8 private immutable _decimals;
    uint256 public immutable TOKEN_CODE;

    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
            ) ERC20(name_, symbol_) {
        _decimals = decimals_;
    }

    function decimals() public view override returns (uint8) {
        return _decimals;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Context.sol";
import "./ERC20Base.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20Base {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function _burnFrom(address account, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20Burnable: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     */
    function burnFrom(address account, uint256 amount) external virtual {
        _burnFrom(account, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.20;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position is the index of the value in the `values` array plus 1.
        // Position 0 is used to mean a value is not in the set.
        mapping(bytes32 value => uint256) _positions;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._positions[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We cache the value's position to prevent multiple reads from the same storage slot
        uint256 position = set._positions[value];

        if (position != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 valueIndex = position - 1;
            uint256 lastIndex = set._values.length - 1;

            if (valueIndex != lastIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the lastValue to the index where the value to delete is
                set._values[valueIndex] = lastValue;
                // Update the tracked position of the lastValue (that was just moved)
                set._positions[lastValue] = position;
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the tracked position for the deleted slot
            delete set._positions[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._positions[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 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 v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Interface for the optional metadata functions from the ERC20 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

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    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;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    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

pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    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
// OpenZeppelin Contracts (last updated v4.7.0) (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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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

pragma solidity ^0.8.17;

import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./ERC20Base.sol";

abstract contract TaxDistributor is ERC20Base {
    using EnumerableSet for EnumerableSet.AddressSet;

    EnumerableSet.AddressSet private _collectors;
    mapping(address => uint256) private _shares;
    uint256 public totalFeeCollectorsShares;

    event FeeCollectorAdded(address indexed account, uint256 share);
    event FeeCollectorUpdated(address indexed account, uint256 oldShare, uint256 newShare);
    event FeeCollectorRemoved(address indexed account);
    event FeeCollected(address indexed receiver, uint256 amount);

    constructor(address[] memory collectors_, uint256[] memory shares_) {
        require(collectors_.length == shares_.length, "Invalid fee collectors");
        for (uint256 i = 0; i < collectors_.length; i++) {
            _addFeeCollector(collectors_[i], shares_[i]);
        }
    }

    function isFeeCollector(address account) public view returns (bool) {
        return _collectors.contains(account);
    }

    function feeCollectorShare(address account) public view returns (uint256) {
        return _shares[account];
    }

    function _addFeeCollector(address account, uint256 share) internal {
        require(!_collectors.contains(account), "Already fee collector");
        require(share > 0, "Invalid share");

        _collectors.add(account);
        _shares[account] = share;
        totalFeeCollectorsShares += share;

        emit FeeCollectorAdded(account, share);
    }

    function _removeFeeCollector(address account) internal {
        require(_collectors.contains(account), "Not fee collector");
        _collectors.remove(account);
        totalFeeCollectorsShares -= _shares[account];
        delete _shares[account];

        emit FeeCollectorRemoved(account);
    }

    function _updateFeeCollectorShare(address account, uint256 share) internal {
        require(_collectors.contains(account), "Not fee collector");
        require(share > 0, "Invalid share");

        uint256 oldShare = _shares[account];
        totalFeeCollectorsShares -= oldShare;

        _shares[account] = share;
        totalFeeCollectorsShares += share;

        emit FeeCollectorUpdated(account, oldShare, share);
    }

    function _distributeFees(uint256 amount, bool inToken) internal returns (bool) {
        if (amount == 0) return false;
        if (totalFeeCollectorsShares == 0) return false;

        uint256 distributed = 0;
        uint256 len = _collectors.length();
        for (uint256 i = 0; i < len; i++) {
            address collector = _collectors.at(i);
            uint256 share = i == len - 1
                ? amount - distributed
                : (amount * _shares[collector]) / totalFeeCollectorsShares;

            if (inToken) {
                _transfer(address(this), collector, share);
            } else {
                payable(collector).transfer(share);
            }
            emit FeeCollected(collector, share);

            distributed += share;
        }

        return true;
    }

    function addFeeCollector(address account, uint256 share) external virtual;

    function removeFeeCollector(address account) external virtual;

    function updateFeeCollectorShare(address account, uint256 share) external virtual;

    function distributeFees(uint256 amount, bool inToken) external virtual;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "./ERC20Base.sol";
import "./TaxDistributor.sol";

/*
 * TaxableToken: Add a tax on buy, sell or transfer
 */
abstract contract TaxableToken is ERC20Base, TaxDistributor {
    struct FeeConfiguration {
        bool feesInToken; // if set to true, collectors will get tokens, if false collector the fee will be swapped for the native currency
        uint16 buyFees; // fees applied during buys, from 0 to 2000 (ie, 100 = 1%)
        uint16 sellFees; // fees applied during sells, from 0 to 2000 (ie, 100 = 1%)
        uint16 transferFees; // fees applied during transfers, from 0 to 2000 (ie, 100 = 1%)
        uint16 burnFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are burned)
        uint16 liquidityFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are added back to liquidity)
        uint16 collectorsFeeRatio; // from 0 to 10000 (ie 8000 = 80% of the fee collected are sent to fee collectors)
    }

    address public constant BURN_ADDRESS = address(0x000000000000000000000000000000000000dEaD);
    uint16 public constant MAX_FEE = 2000; // max 20% fees
    uint16 public constant FEE_PRECISION = 10000;

    // swap config
    IUniswapV2Router02 public swapRouter;
    address public swapPair;
    address public liquidityOwner;

    // fees
    bool private _processingFees;
    bool public autoProcessFees;
    uint256 public numTokensToSwap; // amount of tokens to collect before processing fees (default to 0.05% of supply)
    FeeConfiguration public feeConfiguration;

    mapping(address => bool) private _excludedFromFees;
    mapping(address => bool) private _lpPools;

    event FeeConfigurationUpdated(FeeConfiguration configuration);
    event SwapRouterUpdated(address indexed router, address indexed pair);
    event ExcludedFromFees(address indexed account, bool excluded);
    event SetLpPool(address indexed pairAddress, bool isLp);

    modifier lockTheSwap() {
        _processingFees = true;
        _;
        _processingFees = false;
    }

    constructor(
        bool autoProcessFees_,
        uint256 numTokensToSwap_,
        address swapRouter_,
        FeeConfiguration memory feeConfiguration_
    ) {
        numTokensToSwap = numTokensToSwap_;
        autoProcessFees = autoProcessFees_;

        liquidityOwner = _msgSender();

        // Create a uniswap pair for this new token
        swapRouter = IUniswapV2Router02(swapRouter_);
        swapPair = _pairFor(swapRouter.factory(), address(this), swapRouter.WETH());
        _lpPools[swapPair] = true;

        // configure addresses excluded from fee
        _setIsExcludedFromFees(_msgSender(), true);
        _setIsExcludedFromFees(address(this), true);

        // configure fees
        _setFeeConfiguration(feeConfiguration_);
    }

    // receive ETH when swaping
    receive() external payable {}

    function isExcludedFromFees(address account) public view returns (bool) {
        return _excludedFromFees[account];
    }

    function _setIsExcludedFromFees(address account, bool excluded) internal {
        require(_excludedFromFees[account] != excluded, "Already set");
        _excludedFromFees[account] = excluded;
        emit ExcludedFromFees(account, excluded);
    }

    function _setIsLpPool(address pairAddress, bool isLp) internal {
        require(_lpPools[pairAddress] != isLp, "Already set");
        _lpPools[pairAddress] = isLp;
        emit SetLpPool(pairAddress, isLp);
    }

    function isLpPool(address pairAddress) public view returns (bool) {
        return _lpPools[pairAddress];
    }

    function _setSwapRouter(address _newRouter) internal {
        require(_newRouter != address(0), "Invalid router");

        swapRouter = IUniswapV2Router02(_newRouter);
        IUniswapV2Factory factory = IUniswapV2Factory(swapRouter.factory());
        require(address(factory) != address(0), "Invalid factory");

        address weth = swapRouter.WETH();
        swapPair = factory.getPair(address(this), weth);
        if (swapPair == address(0)) {
            swapPair = factory.createPair(address(this), weth);
        }

        require(swapPair != address(0), "Invalid pair address.");
        emit SwapRouterUpdated(address(swapRouter), swapPair);
    }

    function _setFeeConfiguration(FeeConfiguration memory configuration) internal {
        require(configuration.buyFees <= MAX_FEE, "Invalid buy fee");
        require(configuration.sellFees <= MAX_FEE, "Invalid sell fee");
        require(configuration.transferFees <= MAX_FEE, "Invalid transfer fee");

        uint16 totalShare = configuration.burnFeeRatio +
            configuration.liquidityFeeRatio +
            configuration.collectorsFeeRatio;
        require(totalShare == 0 || totalShare == FEE_PRECISION, "Invalid fee share");

        feeConfiguration = configuration;
        emit FeeConfigurationUpdated(configuration);
    }

    function _processFees(uint256 tokenAmount, uint256 minAmountOut) internal lockTheSwap {
        uint256 contractTokenBalance = balanceOf(address(this));
        if (contractTokenBalance >= tokenAmount) {
            uint256 liquidityAmount = (tokenAmount * feeConfiguration.liquidityFeeRatio) /
                (FEE_PRECISION - feeConfiguration.burnFeeRatio);
            uint256 liquidityTokens = liquidityAmount / 2;

            uint256 collectorsAmount = tokenAmount - liquidityAmount;
            uint256 liquifyAmount = liquidityAmount - liquidityTokens;

            if (!feeConfiguration.feesInToken) {
                liquifyAmount += collectorsAmount;
            }

            // swap tokens
            if (liquifyAmount > 0) {
                if (balanceOf(swapPair) == 0) {
                    // do not swap before the pair has liquidity
                    return;
                }

                // capture the contract's current balance.
                uint256 initialBalance = address(this).balance;

                _swapTokensForEth(liquifyAmount, minAmountOut);

                // how much did we just swap into?
                uint256 swapBalance = address(this).balance - initialBalance;

                // add liquidity
                uint256 liquidityETH = (swapBalance * liquidityTokens) / liquifyAmount;
                if (liquidityETH > 0) {
                    _addLiquidity(liquidityTokens, liquidityETH);
                }
            }

            if (feeConfiguration.feesInToken) {
                // send tokens to fee collectors
                _distributeFees(collectorsAmount, true);
            } else {
                // send remaining ETH to fee collectors
                _distributeFees(address(this).balance, false);
            }
        }
    }

    /// @dev Swap tokens for eth
    function _swapTokensForEth(uint256 tokenAmount, uint256 minAmountOut) private {
        // generate the swap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = swapRouter.WETH();

        _approve(address(this), address(swapRouter), tokenAmount);

        // make the swap
        swapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            minAmountOut,
            path,
            address(this),
            block.timestamp
        );
    }

    /// @dev Add liquidity
    function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(swapRouter), tokenAmount);

        // add the liquidity
        swapRouter.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            liquidityOwner,
            block.timestamp
        );
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function _pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        pair = address(
            uint160(
                uint(
                    keccak256(
                        abi.encodePacked(
                            hex"ff",
                            factory,
                            keccak256(abi.encodePacked(token0, token1)),
                            hex"96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f" // init code hash
                        )
                    )
                )
            )
        );
    }

    function _transfer(address from, address to, uint256 amount) internal virtual override {
        require(amount > 0, "Transfer <= 0");

        uint256 taxFee = 0;
        bool processFee = !_processingFees && autoProcessFees;

        if (!_processingFees) {
            bool fromExcluded = isExcludedFromFees(from);
            bool toExcluded = isExcludedFromFees(to);

            bool fromLP = isLpPool(from);
            bool toLP = isLpPool(to);

            if (fromLP && !toLP && !toExcluded && to != address(swapRouter)) {
                // buy fee
                taxFee = feeConfiguration.buyFees;
            } else if (toLP && !fromExcluded && !toExcluded) {
                // sell fee
                taxFee = feeConfiguration.sellFees;
            } else if (!fromLP && !toLP && from != address(swapRouter) && !fromExcluded) {
                // transfer fee
                taxFee = feeConfiguration.transferFees;
            }
        }

        // process fees
        if (processFee && taxFee > 0 && !_lpPools[from]) {
            uint256 contractTokenBalance = balanceOf(address(this));
            if (contractTokenBalance >= numTokensToSwap) {
                _processFees(numTokensToSwap, 0);
            }
        }

        if (taxFee > 0) {
            uint256 taxAmount = (amount * taxFee) / FEE_PRECISION;
            uint256 sendAmount = amount - taxAmount;
            uint256 burnAmount = (taxAmount * feeConfiguration.burnFeeRatio) / FEE_PRECISION;

            if (burnAmount > 0) {
                taxAmount -= burnAmount;
                super._transfer(from, BURN_ADDRESS, burnAmount);
            }

            if (taxAmount > 0) {
                super._transfer(from, address(this), taxAmount);
            }

            if (sendAmount > 0) {
                super._transfer(from, to, sendAmount);
            }
        } else {
            super._transfer(from, to, amount);
        }
    }

    function setAutoprocessFees(bool autoProcess) external virtual;

    function setIsLpPool(address pairAddress, bool isLp) external virtual;

    function setIsExcludedFromFees(address account, bool excluded) external virtual;

    function processFees(uint256 amount, uint256 minAmountOut) external virtual;

    function setLiquidityOwner(address newOwner) external virtual;

    function setNumTokensToSwap(uint256 amount) external virtual;

    function setFeeConfiguration(FeeConfiguration calldata configuration) external virtual;

    function setSwapRouter(address newRouter) external virtual;
}

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