// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@B7~&@@@@@@@@@@@@@@@@G!:&@@@@@@@@@@@@@@@&5~.&@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&P~    P@@@@@@@@@@@@&Y^    G@@@@@@@@@@@@#J:    G@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#J:       G@@@@@@@@@B7.       G@@@@@@@@&G!.       G@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@G!.          G@@@@@&P~           B@@@@@&Y:           G@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@&Y^              ~&&#J:              ^#&B7.              G@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@#7.                                                         &@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@G                                                         ^5&@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@J              ^5&@&:              ~P&@&:             .7B@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@J          .!G@@@@@@J          .?B@@@@@@J          :Y#@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@J       :J#@@@@@@@@@J       ^5&@@@@@@@@@?      .~P&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@J    ~P&@@@@@@@@@@@@J   .7B@@@@@@@@@@@@@?   :?#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@B^?B@@@@@@@@@@@@@@@@B~J#@@@@@@@@@@@@@@@@#!5&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
//
//          Telegram: t.me/GeorgeBush888
//          Twitter:  twitter.com/bush_skater
//          Website:  https://georgebush888.com
//
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@                                                                                                @@
// @@   This token was launched using software provided by Metadrop. To learn more or to launch      @@
// @@   your own token, visit: https://metadrop.com. See legal info at the end of this file.         @@
// @@                                                                                                @@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
//
// SPDX-License-Identifier: BUSL-1.1
// Metadrop Contracts (v2.1.0)
//// Sources flattened with hardhat v2.17.2 https://hardhat.org

// File @openzeppelin/contracts/token/ERC20/[email protected]

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

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

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

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

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

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File @uniswap/v2-periphery/contracts/interfaces/[email protected]

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);
}

// File @uniswap/v2-periphery/contracts/interfaces/[email protected]

pragma solidity >=0.6.2;

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;
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// File @openzeppelin/contracts/utils/structs/[email protected]

// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @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 of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @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._indexes[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 read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 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 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

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

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

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

            // Delete the index for the deleted slot
            delete set._indexes[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._indexes[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;
    }
}

// File @uniswap/v2-core/contracts/interfaces/[email protected]

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;
}

// File contracts/ERC20Factory/ERC20/IERC20ConfigByMetadrop.sol

// Metadrop Contracts (v2.1.0)

/**
 *
 * @title IERC20ByMetadrop.sol. Interface for metadrop ERC20 standard
 *
 * @author metadrop
 *
 */

pragma solidity 0.8.21;

interface IERC20ConfigByMetadrop {
  enum VaultType {
    unicrypt,
    metavault
  }

  struct ERC20Config {
    bytes baseParameters;
    bytes supplyParameters;
    bytes taxParameters;
    bytes poolParameters;
  }

  struct ERC20BaseParameters {
    string name;
    string symbol;
    bool addLiquidityOnCreate;
    bool usesDRIPool;
  }

  struct ERC20SupplyParameters {
    uint256 maxSupply;
    uint256 lpSupply;
    uint256 projectSupply;
    uint256 maxTokensPerWallet;
    uint256 maxTokensPerTxn;
    uint256 lpLockupInDays;
    uint256 botProtectionDurationInSeconds;
    address projectSupplyRecipient;
    address projectLPOwner;
    bool burnLPTokens;
  }

  struct ERC20TaxParameters {
    uint256 projectBuyTaxBasisPoints;
    uint256 projectSellTaxBasisPoints;
    uint256 taxSwapThresholdBasisPoints;
    uint256 metadropBuyTaxBasisPoints;
    uint256 metadropSellTaxBasisPoints;
    uint256 metadropTaxPeriodInDays;
    address projectTaxRecipient;
    address metadropTaxRecipient;
    uint256 metadropMinBuyTaxBasisPoints; // new in v5
    uint256 metadropMinSellTaxBasisPoints; // new in v5
    uint256 metadropBuyTaxProportionBasisPoints; // new in v5
    uint256 metadropSellTaxProportionBasisPoints; // new in v5
    uint256 autoBurnDurationInBlocks; // new in v5
    uint256 autoBurnBasisPoints; // new in v5
  }

  struct ERC20PoolParameters {
    uint256 poolSupply;
    uint256 poolStartDate;
    uint256 poolEndDate;
    uint256 poolVestingInDays;
    uint256 poolMaxETH;
    uint256 poolPerAddressMaxETH;
    uint256 poolMinETH;
    uint256 poolPerTransactionMinETH;
  }
}

// File contracts/Global/IConfigStructures.sol

// Metadrop Contracts (v2.1.0)

/**
 *
 * @title IConfigStructures.sol. Interface for common config structures used accross the platform
 *
 * @author metadrop
 *
 */

pragma solidity 0.8.21;

interface IConfigStructures {
  enum DropStatus {
    approved,
    deployed,
    cancelled
  }

  enum TemplateStatus {
    live,
    terminated
  }

  // The current status of the mint:
  //   - notEnabled: This type of mint is not part of this drop
  //   - notYetOpen: This type of mint is part of the drop, but it hasn't started yet
  //   - open: it's ready for ya, get in there.
  //   - finished: been and gone.
  //   - unknown: theoretically impossible.
  enum MintStatus {
    notEnabled,
    notYetOpen,
    open,
    finished,
    unknown
  }

  struct SubListConfig {
    uint256 start;
    uint256 end;
    uint256 phaseMaxSupply;
  }

  struct PrimarySaleModuleInstance {
    address instanceAddress;
    string instanceDescription;
  }

  struct NFTModuleConfig {
    uint256 templateId;
    bytes configData;
    bytes vestingData;
  }

  struct PrimarySaleModuleConfig {
    uint256 templateId;
    bytes configData;
  }

  struct ProjectBeneficiary {
    address payable payeeAddress;
    uint256 payeeShares;
  }

  struct VestingConfig {
    uint256 start;
    uint256 projectUpFrontShare;
    uint256 projectVestedShare;
    uint256 vestingPeriodInDays;
    uint256 vestingCliff;
    ProjectBeneficiary[] projectPayees;
  }

  struct RoyaltySplitterModuleConfig {
    uint256 templateId;
    bytes configData;
  }

  struct InLifeModuleConfig {
    uint256 templateId;
    bytes configData;
  }

  struct InLifeModules {
    InLifeModuleConfig[] modules;
  }

  struct NFTConfig {
    uint256 supply;
    string name;
    string symbol;
    bytes32 positionProof;
    bool includePriorPhasesInMintTracking;
    bool singleMetadataCollection;
    uint256 reservedAllocation;
    uint256 assistanceRequestWindowInSeconds;
  }

  struct Template {
    TemplateStatus status;
    uint16 templateNumber;
    uint32 loadedDate;
    address payable templateAddress;
    string templateDescription;
  }

  struct RoyaltyDetails {
    address newRoyaltyPaymentSplitterInstance;
    uint96 royaltyFromSalesInBasisPoints;
  }

  struct SignedDropMessageDetails {
    uint256 messageTimeStamp;
    bytes32 messageHash;
    bytes messageSignature;
  }
}

// File contracts/ERC20Factory/ERC20/IERC20ByMetadrop.sol

// Metadrop Contracts (v2.1.0)

pragma solidity 0.8.21;

/**
 * @dev Metadrop core ERC-20 contract, interface
 */
interface IERC20ByMetadrop is
  IConfigStructures,
  IERC20,
  IERC20ConfigByMetadrop,
  IERC20Metadata
{
  event AutoSwapThresholdUpdated(uint256 oldThreshold, uint256 newThreshold);

  event ExternalCallError(uint256 identifier);

  event InitialLiquidityAdded(uint256 tokenA, uint256 tokenB, uint256 lpToken);

  event LimitsUpdated(
    uint256 oldMaxTokensPerTransaction,
    uint256 newMaxTokensPerTransaction,
    uint256 oldMaxTokensPerWallet,
    uint256 newMaxTokensPerWallet
  );

  event LiquidityLocked(uint256 lpTokens, uint256 lpLockupInDays);

  event LiquidityBurned(uint256 lpTokens);

  event LiquidityPoolCreated(address addedPool);

  event LiquidityPoolAdded(address addedPool);

  event LiquidityPoolRemoved(address removedPool);

  event MetadropTaxBasisPointsChanged(
    uint256 oldBuyBasisPoints,
    uint256 newBuyBasisPoints,
    uint256 oldSellBasisPoints,
    uint256 newSellBasisPoints
  );

  event ProjectTaxBasisPointsChanged(
    uint256 oldBuyBasisPoints,
    uint256 newBuyBasisPoints,
    uint256 oldSellBasisPoints,
    uint256 newSellBasisPoints
  );

  event RevenueAutoSwap();

  event ProjectTaxRecipientUpdated(address treasury);

  event UnlimitedAddressAdded(address addedUnlimted);

  event UnlimitedAddressRemoved(address removedUnlimted);

  event ValidCallerAdded(bytes32 addedValidCaller);

  event ValidCallerRemoved(bytes32 removedValidCaller);

  /**
   * @dev function {addInitialLiquidity}
   *
   * Add initial liquidity to the uniswap pair
   *
   * @param vaultFee_ The vault fee in wei. This must match the required fee from the external vault contract.
   * @param lpLockupInDaysOverride_ The number of days to lock liquidity NOTE you can pass 0 to use the stored value.
   * This value is an override, and will override a stored value which is LOWER that it. If the value you are passing is
   * LOWER than the stored value the stored value will not be reduced.
   *
   * Example usage 1: When creating the coin the lpLockupInDays is set to 0. This means that on this call the
   * user can set the lockup to any value they like, as all integer values greater than zero will be used to override
   * that set in storage.
   *
   * Example usage 2: When using a DRI Pool the lockup period is set on this contract and the pool need not know anything
   * about this setting. The pool can pass back a 0 on this call and know that the existing value stored on this contract
   * will be used.
   * @param burnLPTokensOverride_ If the LP tokens should be burned (otherwise they are locked). This is an override field
   * that can ONLY be used to override a held value of FALSE with a new value of TRUE.
   *
   * Example usage 1: When creating the coin the user didn't add liquidity, or specify that the LP tokens were to be burned.
   * So burnLPTokens is held as FALSE. When they add liquidity they want to lock tokens, so they pass this in as FALSE again,
   * and it remains FALSE.
   *
   * Example usage 2: As above, but when later adding liquidity the user wants to burn the LP. So the stored value is FALSE
   * and the user passes TRUE into this method. The TRUE overrides the held value of FALSE and the tokens are burned.
   *
   * Example uusage 3: The user is using a DRI pool and they have specified on the coin creation that the LP tokens are to
   * be burned. This contract therefore holds TRUE for burnLPTokens. The DRI pool does not need to know what the user has
   * selected. It can safely pass back FALSE to this method call and the stored value of TRUE will remain, resulting in the
   * LP tokens being burned.
   */
  function addInitialLiquidity(
    uint256 vaultFee_,
    uint256 lpLockupInDaysOverride_,
    bool burnLPTokensOverride_
  ) external payable;

  /**
   * @dev function {isLiquidityPool}
   *
   * Return if an address is a liquidity pool
   *
   * @param queryAddress_ The address being queried
   * @return bool The address is / isn't a liquidity pool
   */
  function isLiquidityPool(address queryAddress_) external view returns (bool);

  /**
   * @dev function {liquidityPools}
   *
   * Returns a list of all liquidity pools
   *
   * @return liquidityPools_ a list of all liquidity pools
   */
  function liquidityPools()
    external
    view
    returns (address[] memory liquidityPools_);

  /**
   * @dev function {addLiquidityPool} onlyOwner
   *
   * Allows the manager to add a liquidity pool to the pool enumerable set
   *
   * @param newLiquidityPool_ The address of the new liquidity pool
   */
  function addLiquidityPool(address newLiquidityPool_) external;

  /**
   * @dev function {removeLiquidityPool} onlyOwner
   *
   * Allows the manager to remove a liquidity pool
   *
   * @param removedLiquidityPool_ The address of the old removed liquidity pool
   */
  function removeLiquidityPool(address removedLiquidityPool_) external;

  /**
   * @dev function {isUnlimited}
   *
   * Return if an address is unlimited (is not subject to per txn and per wallet limits)
   *
   * @param queryAddress_ The address being queried
   * @return bool The address is / isn't unlimited
   */
  function isUnlimited(address queryAddress_) external view returns (bool);

  /**
   * @dev function {unlimitedAddresses}
   *
   * Returns a list of all unlimited addresses
   *
   * @return unlimitedAddresses_ a list of all unlimited addresses
   */
  function unlimitedAddresses()
    external
    view
    returns (address[] memory unlimitedAddresses_);

  /**
   * @dev function {addUnlimited} onlyOwner
   *
   * Allows the manager to add an unlimited address
   *
   * @param newUnlimited_ The address of the new unlimited address
   */
  function addUnlimited(address newUnlimited_) external;

  /**
   * @dev function {removeUnlimited} onlyOwner
   *
   * Allows the manager to remove an unlimited address
   *
   * @param removedUnlimited_ The address of the old removed unlimited address
   */
  function removeUnlimited(address removedUnlimited_) external;

  /**
   * @dev function {isValidCaller}
   *
   * Return if an address is a valid caller
   *
   * @param queryHash_ The code hash being queried
   * @return bool The address is / isn't a valid caller
   */
  function isValidCaller(bytes32 queryHash_) external view returns (bool);

  /**
   * @dev function {validCallers}
   *
   * Returns a list of all valid caller code hashes
   *
   * @return validCallerHashes_ a list of all valid caller code hashes
   */
  function validCallers()
    external
    view
    returns (bytes32[] memory validCallerHashes_);

  /**
   * @dev function {addValidCaller} onlyOwner
   *
   * Allows the owner to add the hash of a valid caller
   *
   * @param newValidCallerHash_ The hash of the new valid caller
   */
  function addValidCaller(bytes32 newValidCallerHash_) external;

  /**
   * @dev function {removeValidCaller} onlyOwner
   *
   * Allows the owner to remove a valid caller
   *
   * @param removedValidCallerHash_ The hash of the old removed valid caller
   */
  function removeValidCaller(bytes32 removedValidCallerHash_) external;

  /**
   * @dev function {setProjectTaxRecipient} onlyOwner
   *
   * Allows the manager to set the project tax recipient address
   *
   * @param projectTaxRecipient_ New recipient address
   */
  function setProjectTaxRecipient(address projectTaxRecipient_) external;

  /**
   * @dev function {setSwapThresholdBasisPoints} onlyOwner
   *
   * Allows the manager to set the autoswap threshold
   *
   * @param swapThresholdBasisPoints_ New swap threshold in basis points
   */
  function setSwapThresholdBasisPoints(
    uint16 swapThresholdBasisPoints_
  ) external;

  /**
   * @dev function {setProjectTaxRates} onlyOwner
   *
   * Change the tax rates, subject to only ever decreasing
   *
   * @param newProjectBuyTaxBasisPoints_ The new buy tax rate
   * @param newProjectSellTaxBasisPoints_ The new sell tax rate
   */
  function setProjectTaxRates(
    uint16 newProjectBuyTaxBasisPoints_,
    uint16 newProjectSellTaxBasisPoints_
  ) external;

  /**
   * @dev function {setLimits} onlyOwner
   *
   * Change the limits on transactions and holdings
   *
   * @param newMaxTokensPerTransaction_ The new per txn limit
   * @param newMaxTokensPerWallet_ The new tokens per wallet limit
   */
  function setLimits(
    uint256 newMaxTokensPerTransaction_,
    uint256 newMaxTokensPerWallet_
  ) external;

  /**
   * @dev function {limitsEnforced}
   *
   * Return if limits are enforced on this contract
   *
   * @return bool : they are / aren't
   */
  function limitsEnforced() external view returns (bool);

  /**
   * @dev getMetadropBuyTaxBasisPoints
   *
   * Return the metadrop buy tax basis points given the timed expiry
   */
  function getMetadropBuyTaxBasisPoints() external view returns (uint256);

  /**
   * @dev getMetadropSellTaxBasisPoints
   *
   * Return the metadrop sell tax basis points given the timed expiry
   */
  function getMetadropSellTaxBasisPoints() external view returns (uint256);

  /**
   * @dev totalBuyTaxBasisPoints
   *
   * Provide easy to view tax total:
   */
  function totalBuyTaxBasisPoints() external view returns (uint256);

  /**
   * @dev totalSellTaxBasisPoints
   *
   * Provide easy to view tax total:
   */
  function totalSellTaxBasisPoints() external view returns (uint256);

  /**
   * @dev distributeTaxTokens
   *
   * Allows the distribution of tax tokens to the designated recipient(s)
   *
   * As part of standard processing the tax token balance being above the threshold
   * will trigger an autoswap to ETH and distribution of this ETH to the designated
   * recipients. This is automatic and there is no need for user involvement.
   *
   * As part of this swap there are a number of calculations performed, particularly
   * if the tax balance is above MAX_SWAP_THRESHOLD_MULTIPLE.
   *
   * Testing indicates that these calculations are safe. But given the data / code
   * interactions it remains possible that some edge case set of scenarios may cause
   * an issue with these calculations.
   *
   * This method is therefore provided as a 'fallback' option to safely distribute
   * accumulated taxes from the contract, with a direct transfer of the ERC20 tokens
   * themselves.
   */
  function distributeTaxTokens() external;

  /**
   * @dev function {rescueETH} onlyOwner
   *
   * A withdraw function to allow ETH to be rescued.
   *
   * This contract should never hold ETH. The only envisaged scenario where
   * it might hold ETH is a failed autoswap where the uniswap swap has completed,
   * the recipient of ETH reverts, the contract then wraps to WETH and the
   * wrap to WETH fails.
   *
   * This feels unlikely. But, for safety, we include this method.
   *
   * @param amount_ The amount to withdraw
   */
  function rescueETH(uint256 amount_) external;

  /**
   * @dev function {rescueERC20}
   *
   * A withdraw function to allow ERC20s (except address(this)) to be rescued.
   *
   * This contract should never hold ERC20s other than tax tokens. The only envisaged
   * scenario where it might hold an ERC20 is a failed autoswap where the uniswap swap
   * has completed, the recipient of ETH reverts, the contract then wraps to WETH, the
   * wrap to WETH succeeds, BUT then the transfer of WETH fails.
   *
   * This feels even less likely than the scenario where ETH is held on the contract.
   * But, for safety, we include this method.
   *
   * @param token_ The ERC20 contract
   * @param amount_ The amount to withdraw
   */
  function rescueERC20(address token_, uint256 amount_) external;

  /**
   * @dev function {rescueExcessToken}
   *
   * A withdraw function to allow ERC20s from this address that are above
   * the accrued tax balance to be rescued.
   */
  function rescueExcessToken(uint256 amount_) external;

  /**
   * @dev Destroys a `value` amount of tokens from the caller.
   *
   * See {ERC20-_burn}.
   */
  function burn(uint256 value) external;

  /**
   * @dev Destroys a `value` amount of 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
   * `value`.
   */
  function burnFrom(address account, uint256 value) external;
}

// File contracts/Global/IErrors.sol

// Metadrop Contracts (v2.1.0)

/**
 *
 * @title IErrors.sol. Interface for error definitions used across the platform
 *
 * @author metadrop
 *
 */

pragma solidity 0.8.21;

interface IErrors {
  enum BondingCurveErrorType {
    OK, //                                                  No error
    INVALID_NUMITEMS, //                                    The numItem value is 0
    SPOT_PRICE_OVERFLOW //                                  The updated spot price doesn't fit into 128 bits
  }

  error AdapterParamsMustBeEmpty(); //                      The adapter parameters on this LZ call must be empty.

  error AdditionToPoolIsBelowPerTransactionMinimum(); //    The contribution amount is less than the minimum.

  error AdditionToPoolWouldExceedPoolCap(); //              This addition to the pool would exceed the pool cap.

  error AdditionToPoolWouldExceedPerAddressCap(); //        This addition to the pool would exceed the per address cap.

  error AddressAlreadySet(); //                             The address being set can only be set once, and is already non-0.

  error AllowanceDecreasedBelowZero(); //                   You cannot decrease the allowance below zero.

  error AlreadyInitialised(); //                            The contract is already initialised: it cannot be initialised twice!

  error AmountExceedsAvailable(); //                        You are requesting more token than is available.

  error ApprovalCallerNotOwnerNorApproved(); //             The caller must own the token or be an approved operator.

  error ApproveFromTheZeroAddress(); //                     Approval cannot be called from the zero address (indeed, how have you??).

  error ApproveToTheZeroAddress(); //                       Approval cannot be given to the zero address.

  error ApprovalQueryForNonexistentToken(); //              The token does not exist.

  error AuctionStatusIsNotEnded(); //                       Throw if the action required the auction to be closed, and it isn't.

  error AuctionStatusIsNotOpen(); //                        Throw if the action requires the auction to be open, and it isn't.

  error AuxCallFailed(
    address[] modules,
    uint256 value,
    bytes data,
    uint256 txGas
  ); //                                                     An auxilliary call from the drop factory failed.

  error BalanceMismatch(); //                               An error when comparing balance amounts.

  error BalanceQueryForZeroAddress(); //                    Cannot query the balance for the zero address.

  error BidMustBeBelowTheFloorWhenReducingQuantity(); //    Only bids that are below the floor can reduce the quantity of the bid.

  error BidMustBeBelowTheFloorForRefundDuringAuction(); //  Only bids that are below the floor can be refunded during the auction.

  error BondingCurveError(BondingCurveErrorType error); //  An error of the type specified has occured in bonding curve processing.

  error botProtectionDurationInSecondsMustFitUint128(); //  botProtectionDurationInSeconds cannot be too large.

  error BurnExceedsBalance(); //                            The amount you have selected to burn exceeds the addresses balance.

  error BurnFromTheZeroAddress(); //                        Tokens cannot be burned from the zero address. (Also, how have you called this!?!)

  error CallerIsNotDepositBoxOwner(); //                    The caller is not the owner of the deposit box.

  error CallerIsNotFactory(); //                            The caller of this function must match the factory address in storage.

  error CallerIsNotFactoryOrProjectOwner(); //              The caller of this function must match the factory address OR project owner address.

  error CallerIsNotFactoryProjectOwnerOrPool(); //          The caller of this function must match the factory address, project owner or pool address.

  error CallerIsNotTheOwner(); //                           The caller is not the owner of this contract.

  error CallerIsNotTheManager(); //                         The caller is not the manager of this contract.

  error CallerMustBeLzApp(); //                             The caller must be an LZ application.

  error CallerIsNotPlatformAdmin(address caller); //        The caller of this function must be part of the platformAdmin group.

  error CallerIsNotSuperAdmin(address caller); //           The caller of this function must match the superAdmin address in storage.

  error CannotAddLiquidityOnCreateAndUseDRIPool(); //       Cannot use both liquidity added on create and a DRIPool in the same token.

  error CannotPerformDuringAutoswap(); //                   Cannot call this function during an autoswap.

  error CannotSetNewOwnerToTheZeroAddress(); //             You can't set the owner of this contract to the zero address (address(0)).

  error CannotSetToZeroAddress(); //                        The corresponding address cannot be set to the zero address (address(0)).

  error CannotSetNewManagerToTheZeroAddress(); //           Cannot transfer the manager to the zero address (address(0)).

  error CannotWithdrawThisToken(); //                       Cannot withdraw the specified token.

  error CanOnlyReduce(); //                                 The given operation can only reduce the value specified.

  error CollectionAlreadyRevealed(); //                     The collection is already revealed; you cannot call reveal again.

  error ContractIsDecommissioned(); //                      This contract is decommissioned!

  error ContractIsPaused(); //                              The call requires the contract to be unpaused, and it is paused.

  error ContractIsNotPaused(); //                           The call required the contract to be paused, and it is NOT paused.

  error DecreasedAllowanceBelowZero(); //                   The request would decrease the allowance below zero, and that is not allowed.

  error DestinationIsNotTrustedSource(); //                 The destination that is being called through LZ has not been set as trusted.

  error DeductionsOnBuyExceedOrEqualOneHundredPercent(); // The total of all buy deductions cannot equal or exceed 100%.

  error DeployerOnly(); //                                  This method can only be called by the deployer address.

  error DeploymentError(); //                               Error on deployment.

  error DepositBoxIsNotOpen(); //                           This action cannot complete as the deposit box is not open.

  error DriPoolAddressCannotBeAddressZero(); //             The Dri Pool address cannot be the zero address.

  error GasLimitIsTooLow(); //                              The gas limit for the LayerZero call is too low.

  error IncorrectConfirmationValue(); //                    You need to enter the right confirmation value to call this funtion (usually 69420).

  error IncorrectPayment(); //                              The function call did not include passing the correct payment.

  error InitialLiquidityAlreadyAdded(); //                  Initial liquidity has already been added. You can't do it again.

  error InitialLiquidityNotYetAdded(); //                   Initial liquidity needs to have been added for this to succedd.

  error InsufficientAllowance(); //                         There is not a high enough allowance for this operation.

  error InvalidAdapterParams(); //                          The current adapter params for LayerZero on this contract won't work :(.

  error InvalidAddress(); //                                An address being processed in the function is not valid.

  error InvalidEndpointCaller(); //                         The calling address is not a valid LZ endpoint. The LZ endpoint was set at contract creation
  //                                                        and cannot be altered after. Check the address LZ endpoint address on the contract.

  error InvalidHash(); //                                   The passed hash does not meet requirements.

  error InvalidMinGas(); //                                 The minimum gas setting for LZ in invalid.

  error InvalidOracleSignature(); //                        The signature provided with the contract call is not valid, either in format or signer.

  error InvalidPayload(); //                                The LZ payload is invalid

  error InvalidReceiver(); //                               The address used as a target for funds is not valid.

  error InvalidSourceSendingContract(); //                  The LZ message is being related from a source contract on another chain that is NOT trusted.

  error InvalidTotalShares(); //                            Total shares must equal 100 percent in basis points.

  error LimitsCanOnlyBeRaised(); //                         Limits are UP ONLY.

  error LimitTooHigh(); //                                  The limit has been set too high.

  error ListLengthMismatch(); //                            Two or more lists were compared and they did not match length.

  error LiquidityPoolMustBeAContractAddress(); //           Cannot add a non-contract as a liquidity pool.

  error LiquidityPoolCannotBeAddressZero(); //              Cannot add a liquidity pool from the zero address.

  error LPLockUpMustFitUint88(); //                         LP lockup is held in a uint88, so must fit.

  error NoTrustedPathRecord(); //                           LZ needs a trusted path record for this to work. What's that, you ask?

  error MachineAddressCannotBeAddressZero(); //             Cannot set the machine address to the zero address.

  error ManagerUnauthorizedAccount(); //                    The caller is not the pending manager.

  error MaxBidQuantityIs255(); //                           Validation: as we use a uint8 array to track bid positions the max bid quantity is 255.

  error MaxPublicMintAllowanceExceeded(
    uint256 requested,
    uint256 alreadyMinted,
    uint256 maxAllowance
  ); //                                                     The calling address has requested a quantity that would exceed the max allowance.

  error MaxSupplyTooHigh(); //                              Max supply must fit in a uint128.

  error MaxTokensPerWalletExceeded(); //                    The transfer would exceed the max tokens per wallet limit.

  error MaxTokensPerTxnExceeded(); //                       The transfer would exceed the max tokens per transaction limit.

  error MetadataIsLocked(); //                              The metadata on this contract is locked; it cannot be altered!

  error MetadropFactoryOnlyOncePerReveal(); //              This function can only be called (a) by the factory and, (b) just one time!

  error MetadropModulesOnly(); //                           Can only be called from a metadrop contract.

  error MetadropOracleCannotBeAddressZero(); //             The metadrop Oracle cannot be the zero address (address(0)).

  error MinGasLimitNotSet(); //                             The minimum gas limit for LayerZero has not been set.

  error MintERC2309QuantityExceedsLimit(); //               The `quantity` minted with ERC2309 exceeds the safety limit.

  error MintingIsClosedForever(); //                        Minting is, as the error suggests, so over (and locked forever).

  error MintToZeroAddress(); //                             Cannot mint to the zero address.

  error MintZeroQuantity(); //                              The quantity of tokens minted must be more than zero.

  error NewBuyTaxBasisPointsExceedsMaximum(); //            Project owner trying to set the tax rate too high.

  error NewSellTaxBasisPointsExceedsMaximum(); //           Project owner trying to set the tax rate too high.

  error NoETHForLiquidityPair(); //                         No ETH has been provided for the liquidity pair.

  error TaxPeriodStillInForce(); //                         The minimum tax period has not yet expired.

  error NoPaymentDue(); //                                  No payment is due for this address.

  error NoRefundForCaller(); //                             Error thrown when the calling address has no refund owed.

  error NoStoredMessage(); //                               There is no stored message matching the passed parameters.

  error NothingToClaim(); //                                The calling address has nothing to claim.

  error NoTokenForLiquidityPair(); //                       There is no token to add to the LP.

  error OperationDidNotSucceed(); //                        The operation failed (vague much?).

  error OracleSignatureHasExpired(); //                     A signature has been provided but it is too old.

  error OwnableUnauthorizedAccount(); //                    The caller is not the pending owner.

  error OwnershipNotInitializedForExtraData(); //           The `extraData` cannot be set on an uninitialized ownership slot.

  error OwnerQueryForNonexistentToken(); //                 The token does not exist.

  error ParametersDoNotMatchSignedMessage(); //             The parameters passed with the signed message do not match the message itself.

  error ParamTooLargeStartDate(); //                        The passed parameter exceeds the var type max.

  error ParamTooLargeEndDate(); //                          The passed parameter exceeds the var type max.

  error ParamTooLargeMinETH(); //                           The passed parameter exceeds the var type max.

  error ParamTooLargePerAddressMax(); //                    The passed parameter exceeds the var type max.

  error ParamTooLargeVestingDays(); //                      The passed parameter exceeds the var type max.

  error ParamTooLargePoolSupply(); //                       The passed parameter exceeds the var type max.

  error ParamTooLargePoolPerTxnMinETH(); //                 The passed parameter exceeds the var type max.

  error PassedConfigDoesNotMatchApproved(); //              The config provided on the call does not match the approved config.

  error PauseCutOffHasPassed(); //                          The time period in which we can pause has passed; this contract can no longer be paused.

  error PaymentMustCoverPerMintFee(); //                    The payment passed must at least cover the per mint fee for the quantity requested.

  error PermitDidNotSucceed(); //                           The safeERC20 permit failed.

  error PlatformAdminCannotBeAddressZero(); //              We cannot use the zero address (address(0)) as a platformAdmin.

  error PlatformTreasuryCannotBeAddressZero(); //           The treasury address cannot be set to the zero address.

  error PoolIsAboveMinimum(); //                            You required the pool to be below the minimum, and it is not

  error PoolIsBelowMinimum(); //                            You required the pool to be above the minimum, and it is not

  error PoolPhaseIsClosed(); //                             The block.timestamp is either before the pool is open or after it is closed.

  error PoolPhaseIsNotAfter(); //                           The block.timestamp is either before or during the pool open phase.

  error PoolVestingNotYetComplete(); //                     Tokens in the pool are not yet vested.

  error ProjectOwnerCannotBeAddressZero(); //               The project owner has to be a non zero address.

  error ProofInvalid(); //                                  The provided proof is not valid with the provided arguments.

  error QuantityExceedsRemainingCollectionSupply(); //      The requested quantity would breach the collection supply.

  error QuantityExceedsRemainingPhaseSupply(); //           The requested quantity would breach the phase supply.

  error QuantityExceedsMaxPossibleCollectionSupply(); //    The requested quantity would breach the maximum trackable supply

  error ReferralIdAlreadyUsed(); //                         This referral ID has already been used; they are one use only.

  error RequestingMoreThanAvailableBalance(); //             The request exceeds the available balance.

  error RequestingMoreThanRemainingAllocation(
    uint256 previouslyMinted,
    uint256 requested,
    uint256 remainingAllocation
  ); //                                                     Number of tokens requested for this mint exceeds the remaining allocation (taking the
  //                                                        original allocation from the list and deducting minted tokens).

  error RoyaltyFeeWillExceedSalePrice(); //                 The ERC2981 royalty specified will exceed the sale price.

  error ShareTotalCannotBeZero(); //                        The total of all the shares cannot be nothing.

  error SliceOutOfBounds(); //                              The bytes slice operation was out of bounds.

  error SliceOverflow(); //                                 The bytes slice operation overlowed.

  error SuperAdminCannotBeAddressZero(); //                 The superAdmin cannot be the sero address (address(0)).

  error SupplyTotalMismatch(); //                           The sum of the team supply and lp supply does not match.

  error SupportWindowIsNotOpen(); //                        The project owner has not requested support within the support request expiry window.

  error SwapThresholdTooLow(); // The select swap threshold is below the minimum.

  error TaxFreeAddressCannotBeAddressZero(); //             A tax free address cannot be address(0)

  error TemplateCannotBeAddressZero(); //                   The address for a template cannot be address zero (address(0)).

  error TemplateNotFound(); //                              There is no template that matches the passed template Id.

  error ThisMintIsClosed(); //                              It's over (well, this mint is, anyway).

  error TotalSharesMustMatchDenominator(); //               The total of all shares must equal the denominator value.

  error TransferAmountExceedsBalance(); //                  The transfer amount exceeds the accounts available balance.

  error TransferCallerNotOwnerNorApproved(); //             The caller must own the token or be an approved operator.

  error TransferFailed(); //                                The transfer has failed.

  error TransferFromIncorrectOwner(); //                    The token must be owned by `from`.

  error TransferToNonERC721ReceiverImplementer(); //        Cannot safely transfer to a contract that does not implement the ERC721Receiver interface.

  error TransferFromZeroAddress(); //                       Cannot transfer from the zero address. Indeed, this surely is impossible, and likely a waste to check??

  error TransferToZeroAddress(); //                         Cannot transfer to the zero address.

  error UnrecognisedVRFMode(); //                           Currently supported VRF modes are 0: chainlink and 1: arrng

  error URIQueryForNonexistentToken(); //                   The token does not exist.

  error ValueExceedsMaximum(); //                           The value sent exceeds the maximum allowed (super useful explanation huh?).

  error VRFCoordinatorCannotBeAddressZero(); //             The VRF coordinator cannot be the zero address (address(0)).
}

// File contracts/ERC20Factory/ERC20Factory/IERC20FactoryByMetadrop.sol

// Metadrop Contracts (v2.1.0)

pragma solidity 0.8.21;

/**
 * @dev Metadrop ERC-20 factory, interface
 */
interface IERC20FactoryByMetadrop is
  IConfigStructures,
  IErrors,
  IERC20ConfigByMetadrop
{
  event DriPoolAddressUpdated(address oldAddress, address newAddress);

  event ERC20Created(
    string metaId,
    address indexed deployer,
    address contractInstance,
    address driPoolInstance,
    string symbol,
    string name,
    bytes constructorArgs
  );

  event MachineAddressUpdated(address oldAddress, address newAddress);

  event OracleAddressUpdated(address oldAddress, address newAddress);

  event MessageValidityInSecondsUpdated(
    uint256 oldMessageValidityInSeconds,
    uint256 newMessageValidityInSeconds
  );

  event PlatformTreasuryUpdated(address oldAddress, address newAddress);

  /**
   * @dev function {initialiseMachineAddress}
   *
   * Initialise the machine template address. This needs to be separate from
   * the constructor as the machine needs the factory address on its constructor.
   *
   * This must ALWAYS be called as part of deployment.
   *
   * @param machineTemplate_ the machine address
   */
  function initialiseMachineAddress(address machineTemplate_) external;

  /**
   * @dev function {decommissionFactory} onlySuperAdmin
   *
   * Make this factory unusable for creating new ERC20s, forever
   *
   */
  function decommissionFactory() external;

  /**
   * @dev function {setMetadropOracleAddress} onlyPlatformAdmin
   *
   * Set the metadrop trusted oracle address
   *
   * @param metadropOracleAddress_ Trusted metadrop oracle address
   */
  function setMetadropOracleAddress(address metadropOracleAddress_) external;

  /**
   * @dev function {setMessageValidityInSeconds} onlyPlatformAdmin
   *
   * Set the validity period of signed messages
   *
   * @param messageValidityInSeconds_ Validity period in seconds for messages signed by the trusted oracle
   */
  function setMessageValidityInSeconds(
    uint256 messageValidityInSeconds_
  ) external;

  /**
   * @dev function {setPlatformTreasury} onlySuperAdmin
   *
   * Set the address that platform fees will be paid to / can be withdrawn to.
   * Note that this is restricted to the highest authority level, the super
   * admin. Platform admins can trigger a withdrawal to the treasury, but only
   * the default admin can set or alter the treasury address. It is recommended
   * that the default admin is highly secured and restrited e.g. a multi-sig.
   *
   * @param platformTreasury_ New treasury address
   */
  function setPlatformTreasury(address platformTreasury_) external;

  /**
   * @dev function {setMachineAddress} onlyPlatformAdmin
   *
   * Set a new machine template address
   *
   * @param newMachineAddress_ the new machine address
   */
  function setMachineAddress(address newMachineAddress_) external;

  /**
   * @dev function {setDriPoolAddress} onlyPlatformAdmin
   *
   * Set a new launch pool template address
   *
   * @param newDriPoolAddress_ the new launch pool address
   */
  function setDriPoolAddress(address newDriPoolAddress_) external;

  /**
   * @dev function {withdrawETH} onlyPlatformAdmin
   *
   * A withdraw function to allow ETH to be withdrawn to the treasury
   *
   * @param amount_ The amount to withdraw
   */
  function withdrawETH(uint256 amount_) external;

  /**
   * @dev function {withdrawERC20} onlyPlatformAdmin
   *
   * A withdraw function to allow ERC20s to be withdrawn to the treasury
   *
   * @param token_ The contract address of the token being withdrawn
   * @param amount_ The amount to withdraw
   */
  function withdrawERC20(IERC20 token_, uint256 amount_) external;

  /**
   * @dev function {createERC20}
   *
   * Create an ERC-20
   *
   * @param metaId_ The drop Id being approved
   * @param salt_ Salt for create2
   * @param erc20Config_ ERC20 configuration
   * @param signedMessage_ The signed message object
   * @param vaultFee_ The fee for the token vault
   * @param deploymentFee_ The fee for deployment, if any
   * @return deployedAddress_ The deployed ERC20 contract address
   */
  function createERC20(
    string calldata metaId_,
    bytes32 salt_,
    ERC20Config calldata erc20Config_,
    SignedDropMessageDetails calldata signedMessage_,
    uint256 vaultFee_,
    uint256 deploymentFee_
  ) external payable returns (address deployedAddress_);

  /**
   * @dev function {createConfigHash}
   *
   * Create the config hash
   *
   * @param metaId_ The drop Id being approved
   * @param salt_ Salt for create2
   * @param erc20Config_ ERC20 configuration
   * @param messageTimeStamp_ When the message for this config hash was signed
   * @param vaultFee_ The fee for the token vault
   * @param deploymentFee_ The fee for deployment, if any
   * @param deployer_ Address performing the deployment
   * @return configHash_ The bytes32 config hash
   */
  function createConfigHash(
    string calldata metaId_,
    bytes32 salt_,
    ERC20Config calldata erc20Config_,
    uint256 messageTimeStamp_,
    uint256 vaultFee_,
    uint256 deploymentFee_,
    address deployer_
  ) external pure returns (bytes32 configHash_);
}

// File contracts/Global/Revert.sol

// Metadrop Contracts (v2.1.0)

/**
 *
 * @title Revert.sol. For efficient reverts
 *
 * @author metadrop
 *
 */

pragma solidity 0.8.21;

abstract contract Revert {
  /**
   * @dev For more efficient reverts.
   */
  function _revert(bytes4 errorSelector) internal pure {
    assembly {
      mstore(0x00, errorSelector)
      revert(0x00, 0x04)
    }
  }
}

// File contracts/Global/OZ/Ownable.sol

// Metadrop Contracts (v2.1.0)
// Metadrop based on OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity 0.8.21;

/**
 * @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 IErrors, Revert, 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 {
    if (owner() != _msgSender()) {
      _revert(CallerIsNotTheOwner.selector);
    }
  }

  /**
   * @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(CannotSetNewOwnerToTheZeroAddress.selector);
    }
    _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);
  }
}

// File contracts/Global/OZ/Ownable2Step.sol

// Metadrop Contracts (v2.1.0)
// Metadrop based on OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity 0.8.21;

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
  address private _pendingOwner;

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

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

  /**
   * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
   * Can only be called by the current owner.
   */
  function transferOwnership(
    address newOwner
  ) public virtual override onlyOwner {
    _pendingOwner = newOwner;
    emit OwnershipTransferStarted(owner(), newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
   * Internal function without access restriction.
   */
  function _transferOwnership(address newOwner) internal virtual override {
    delete _pendingOwner;
    super._transferOwnership(newOwner);
  }

  /**
   * @dev The new owner accepts the ownership transfer.
   */
  function acceptOwnership() public virtual {
    address sender = _msgSender();
    if (pendingOwner() != sender) {
      _revert(OwnableUnauthorizedAccount.selector);
    }
    _transferOwnership(sender);
  }
}

// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File @openzeppelin/contracts/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// File contracts/Global/OZ/SafeERC20.sol

// Metadrop Contracts (v2.1.0)
// Metadrop based on OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity 0.8.21;

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 {
  using Address for address;

  /**
   * @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 Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
   * non-reverting calls are assumed to be successful.
   */
  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 `value`. If `token` returns no value,
   * non-reverting calls are assumed to be successful.
   */
  function safeDecreaseAllowance(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    unchecked {
      uint256 oldAllowance = token.allowance(address(this), spender);
      if (oldAllowance < value) {
        revert IErrors.DecreasedAllowanceBelowZero();
      }
      forceApprove(token, spender, oldAllowance - value);
    }
  }

  /**
   * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
   * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
   * 0 before setting it to a non-zero value.
   */
  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 Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
   * Revert on invalid signature.
   */
  function safePermit(
    IERC20Permit token,
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal {
    uint256 nonceBefore = token.nonces(owner);
    token.permit(owner, spender, value, deadline, v, r, s);
    uint256 nonceAfter = token.nonces(owner);
    if (nonceAfter != (nonceBefore + 1)) {
      revert IErrors.PermitDidNotSucceed();
    }
  }

  /**
   * @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).
   */
  function _callOptionalReturn(IERC20 token, bytes memory data) private {
    // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
    // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
    // the target address contains contract code and also asserts for success in the low-level call.

    bytes memory returndata = address(token).functionCall(data, "call fail");
    if ((returndata.length != 0) && !abi.decode(returndata, (bool))) {
      revert IErrors.OperationDidNotSucceed();
    }
  }

  /**
   * @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 silents catches all reverts and returns a bool instead.
   */
  function _callOptionalReturnBool(
    IERC20 token,
    bytes memory data
  ) private returns (bool) {
    // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
    // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
    // and not revert is the subcall reverts.

    (bool success, bytes memory returndata) = address(token).call(data);
    return
      success &&
      (returndata.length == 0 || abi.decode(returndata, (bool))) &&
      address(token).code.length > 0;
  }
}

// File contracts/ThirdParty/Unicrypt/IUniswapV2Locker.sol

// Interface definition for UniswapV2Locker.sol

pragma solidity 0.8.21;

interface IERCBurn {
  function burn(uint256 _amount) external;

  function approve(address spender, uint256 amount) external returns (bool);

  function allowance(address owner, address spender) external returns (uint256);

  function balanceOf(address account) external view returns (uint256);
}

interface IMigrator {
  function migrate(
    address lpToken,
    uint256 amount,
    uint256 unlockDate,
    address owner
  ) external returns (bool);
}

interface IUniswapV2Locker {
  struct UserInfo {
    EnumerableSet.AddressSet lockedTokens; // records all tokens the user has locked
    mapping(address => uint256[]) locksForToken; // map erc20 address to lock id for that token
  }

  struct TokenLock {
    uint256 lockDate; // the date the token was locked
    uint256 amount; // the amount of tokens still locked (initialAmount minus withdrawls)
    uint256 initialAmount; // the initial lock amount
    uint256 unlockDate; // the date the token can be withdrawn
    uint256 lockID; // lockID nonce per uni pair
    address owner;
  }

  struct FeeStruct {
    uint256 ethFee; // Small eth fee to prevent spam on the platform
    IERCBurn secondaryFeeToken; // UNCX or UNCL
    uint256 secondaryTokenFee; // optional, UNCX or UNCL
    uint256 secondaryTokenDiscount; // discount on liquidity fee for burning secondaryToken
    uint256 liquidityFee; // fee on univ2 liquidity tokens
    uint256 referralPercent; // fee for referrals
    IERCBurn referralToken; // token the refferer must hold to qualify as a referrer
    uint256 referralHold; // balance the referrer must hold to qualify as a referrer
    uint256 referralDiscount; // discount on flatrate fees for using a valid referral address
  }

  function setDev(address payable _devaddr) external;

  /**
   * @notice set the migrator contract which allows locked lp tokens to be migrated to uniswap v3
   */
  function setMigrator(IMigrator _migrator) external;

  function setSecondaryFeeToken(address _secondaryFeeToken) external;

  /**
   * @notice referrers need to hold the specified token and hold amount to be elegible for referral fees
   */
  function setReferralTokenAndHold(
    IERCBurn _referralToken,
    uint256 _hold
  ) external;

  function setFees(
    uint256 _referralPercent,
    uint256 _referralDiscount,
    uint256 _ethFee,
    uint256 _secondaryTokenFee,
    uint256 _secondaryTokenDiscount,
    uint256 _liquidityFee
  ) external;

  /**
   * @notice whitelisted accounts dont pay flatrate fees on locking
   */
  function whitelistFeeAccount(address _user, bool _add) external;

  /**
   * @notice Creates a new lock
   * @param _lpToken the univ2 token address
   * @param _amount amount of LP tokens to lock
   * @param _unlock_date the unix timestamp (in seconds) until unlock
   * @param _referral the referrer address if any or address(0) for none
   * @param _fee_in_eth fees can be paid in eth or in a secondary token such as UNCX with a discount on univ2 tokens
   * @param _withdrawer the user who can withdraw liquidity once the lock expires.
   */
  function lockLPToken(
    address _lpToken,
    uint256 _amount,
    uint256 _unlock_date,
    address payable _referral,
    bool _fee_in_eth,
    address payable _withdrawer
  ) external payable;

  /**
   * @notice extend a lock with a new unlock date, _index and _lockID ensure the correct lock is changed
   * this prevents errors when a user performs multiple tx per block possibly with varying gas prices
   */
  function relock(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    uint256 _unlock_date
  ) external;

  /**
   * @notice withdraw a specified amount from a lock. _index and _lockID ensure the correct lock is changed
   * this prevents errors when a user performs multiple tx per block possibly with varying gas prices
   */
  function withdraw(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    uint256 _amount
  ) external;

  /**
   * @notice increase the amount of tokens per a specific lock, this is preferable to creating a new lock, less fees, and faster loading on our live block explorer
   */
  function incrementLock(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    uint256 _amount
  ) external;

  /**
   * @notice split a lock into two seperate locks, useful when a lock is about to expire and youd like to relock a portion
   * and withdraw a smaller portion
   */
  function splitLock(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    uint256 _amount
  ) external payable;

  /**
   * @notice transfer a lock to a new owner, e.g. presale project -> project owner
   */
  function transferLockOwnership(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    address payable _newOwner
  ) external;

  /**
   * @notice migrates liquidity to uniswap v3
   */
  function migrate(
    address _lpToken,
    uint256 _index,
    uint256 _lockID,
    uint256 _amount
  ) external;

  function getNumLocksForToken(
    address _lpToken
  ) external view returns (uint256);

  function getNumLockedTokens() external view returns (uint256);

  function getLockedTokenAtIndex(
    uint256 _index
  ) external view returns (address);

  // user functions
  function getUserNumLockedTokens(
    address _user
  ) external view returns (uint256);

  function getUserLockedTokenAtIndex(
    address _user,
    uint256 _index
  ) external view returns (address);

  function getUserNumLocksForToken(
    address _user,
    address _lpToken
  ) external view returns (uint256);

  function getUserLockForTokenAtIndex(
    address _user,
    address _lpToken,
    uint256 _index
  )
    external
    view
    returns (uint256, uint256, uint256, uint256, uint256, address);

  // whitelist
  function getWhitelistedUsersLength() external view returns (uint256);

  function getWhitelistedUserAtIndex(
    uint256 _index
  ) external view returns (address);

  function getUserWhitelistStatus(address _user) external view returns (bool);
}

// File contracts/ThirdParty/WETH/IWETH.sol

pragma solidity 0.8.21;

interface IWETH is IERC20 {
  function deposit() external payable;

  function withdraw(uint256 wad) external;
}

// File contracts/ERC20Factory/ERC20/ERC20ByMetadrop.sol

// Metadrop Contracts (v2.1.0)

pragma solidity 0.8.21;

/**
 * @dev Metadrop core ERC-20 contract
 *
 * @dev Implementation of the {IERC20} interface.
 *
 */
contract ERC20ByMetadrop is Context, IERC20ByMetadrop, Ownable2Step {
  bytes32 public constant x_META_ID_HASH =
    0x4468f4ccf832686c18f756464afb6adb6b9ba870dc25c30726aaea2392002e5a;

  using EnumerableSet for EnumerableSet.AddressSet;
  using EnumerableSet for EnumerableSet.Bytes32Set;
  using SafeERC20 for IERC20;

  uint256 public constant x_CONST_VERSION = 100020001000000000;
  uint256 internal constant CONST_BP_DENOM = 10000;
  uint256 internal constant CONST_ROUND_DEC = 100000000000;
  uint256 internal constant CONST_CALL_GAS_LIMIT = 50000;
  uint256 internal constant CONST_MAX_SWAP_THRESHOLD_MULTIPLE = 20;
  uint256 internal constant CONST_MIN_SWAP_THRESHOLD_BP = 1;

  uint256 public immutable lpSupply;
  uint256 public immutable projectSupply;
  uint256 public immutable botProtectionDurationInSeconds;
  uint256 public immutable metadropTaxPeriodInDays;
  uint256 public immutable metadropBuyTaxProportionBasisPoints;
  uint256 public immutable metadropSellTaxProportionBasisPoints;
  uint256 public immutable metadropMinBuyTaxBasisPoints;
  uint256 public immutable metadropMinSellTaxBasisPoints;
  uint256 public immutable autoBurnDurationInBlocks;
  uint256 public immutable autoBurnBasisPoints;
  address public immutable metadropTaxRecipient;
  address public immutable uniswapV2Pair;
  address public immutable driPool;
  address public immutable lpOwner;
  address public immutable projectSupplyRecipient;
  address public immutable metadropFactory;

  bool internal immutable _tokenHasTax;
  IUniswapV2Locker internal immutable _tokenVault;
  IUniswapV2Router02 internal immutable _uniswapRouter;
  VaultType public immutable vaultType;

  /** @dev {Storage Slot 1} Vars read as part of transfers packed to a single
   * slot for warm reads.
   *   Slot 1:
   *      120
   *       32
   *       32
   *   16 * 4
   *        8
   *   ------
   *      256
   *   ------ */
  uint120 private _totalSupply;
  uint32 public fundedDate;
  uint32 public fundedBlock;
  uint16 public projectBuyTaxBasisPoints;
  uint16 public projectSellTaxBasisPoints;
  uint16 public metadropBuyTaxBasisPoints;
  uint16 public metadropSellTaxBasisPoints;
  /** @dev {_autoSwapInProgress} We start with {_autoSwapInProgress} ON, as we don't want to
   * call autoswap when processing initial liquidity from this address. We turn this OFF when
   * liquidity has been loaded, and use this bool to control processing during auto-swaps
   * from that point onwards. */
  bool private _autoSwapInProgress = true;

  /** @dev {Storage Slot 2} Vars read as part of transfers packed to a single
   * slot for warm reads.
   *   Slot 1:
   *      120
   *      120
   *       16
   *   ------
   *      256
   *   ------ */
  uint120 public maxTokensPerTransaction;
  uint120 public maxTokensPerWallet;
  uint16 public swapThresholdBasisPoints;

  /** @dev {Storage Slot 3} Not read / written in transfers (unless autoswap taking place):
   *      160
   *       88
   *        8
   *   ------
   *      256
   *   ------ */
  address public projectTaxRecipient;
  uint88 public lpLockupInDays;
  bool public burnLPTokens;

  /** @dev {Storage Slot 4} Potentially written in transfers:
   *   Slot 3:
   *      128
   *      128
   *   ------
   *      256
   *   ------ */
  uint128 public projectTaxPendingSwap;
  uint128 public metadropTaxPendingSwap;

  /** @dev {Storage Slot 5 to n} Not read as part of transfers etc. */
  string private _name;
  string private _symbol;

  /** @dev {_balances} Addresses balances */
  mapping(address => uint256) private _balances;

  /** @dev {_allowances} Addresses allocance details */
  mapping(address => mapping(address => uint256)) private _allowances;

  /** @dev {_validCallerCodeHashes} Code hashes of callers we consider valid */
  EnumerableSet.Bytes32Set private _validCallerCodeHashes;

  /** @dev {_liquidityPools} Enumerable set for liquidity pool addresses */
  EnumerableSet.AddressSet private _liquidityPools;

  /** @dev {_unlimited} Enumerable set for addresses where limits do not apply */
  EnumerableSet.AddressSet private _unlimited;

  /**
   * @dev {constructor}
   *
   * @param integrationAddresses_ The project owner, uniswap router, unicrypt vault, metadrop factory and pool template.
   * @param baseParams_ configuration of this ERC20.
   * @param supplyParams_ Supply configuration of this ERC20.
   * @param taxParams_  Tax configuration of this ERC20
   * @param taxParams_  Launch pool configuration of this ERC20
   */
  constructor(
    address[5] memory integrationAddresses_,
    bytes memory baseParams_,
    bytes memory supplyParams_,
    bytes memory taxParams_,
    bytes memory poolParams_
  ) {
    _decodeBaseParams(integrationAddresses_[0], baseParams_);
    _uniswapRouter = IUniswapV2Router02(integrationAddresses_[1]);
    _tokenVault = IUniswapV2Locker(integrationAddresses_[2]);
    metadropFactory = (integrationAddresses_[3]);

    ERC20SupplyParameters memory supplyParams = abi.decode(
      supplyParams_,
      (ERC20SupplyParameters)
    );

    ERC20TaxParameters memory taxParams = abi.decode(
      taxParams_,
      (ERC20TaxParameters)
    );

    driPool = integrationAddresses_[4];

    ERC20PoolParameters memory poolParams;

    if (integrationAddresses_[4] != address(0)) {
      poolParams = abi.decode(poolParams_, (ERC20PoolParameters));
    }

    _processSupplyParams(supplyParams, poolParams);
    projectSupplyRecipient = supplyParams.projectSupplyRecipient;
    lpSupply = supplyParams.lpSupply * (10 ** decimals());
    projectSupply = supplyParams.projectSupply * (10 ** decimals());
    botProtectionDurationInSeconds = supplyParams
      .botProtectionDurationInSeconds;
    lpOwner = supplyParams.projectLPOwner;

    _tokenHasTax = _processTaxParams(taxParams);

    metadropTaxPeriodInDays = taxParams.metadropTaxPeriodInDays;
    metadropTaxRecipient = taxParams.metadropTaxRecipient;
    metadropBuyTaxProportionBasisPoints = taxParams
      .metadropBuyTaxProportionBasisPoints;
    metadropSellTaxProportionBasisPoints = taxParams
      .metadropSellTaxProportionBasisPoints;
    metadropMinBuyTaxBasisPoints = uint16(
      taxParams.metadropMinBuyTaxBasisPoints
    );
    metadropMinSellTaxBasisPoints = uint16(
      taxParams.metadropMinSellTaxBasisPoints
    );
    autoBurnDurationInBlocks = taxParams.autoBurnDurationInBlocks;
    autoBurnBasisPoints = taxParams.autoBurnBasisPoints;

    vaultType = VaultType.unicrypt;

    _mintBalances(
      lpSupply,
      projectSupply,
      poolParams.poolSupply * (10 ** decimals())
    );

    uniswapV2Pair = _createPair();
  }

  /**
   * @dev {onlyOwnerFactoryOrPool}
   *
   * Throws if called by any account other than the owner, factory or pool.
   */
  modifier onlyOwnerFactoryOrPool() {
    if (
      metadropFactory != _msgSender() &&
      owner() != _msgSender() &&
      driPool != _msgSender()
    ) {
      _revert(CallerIsNotFactoryProjectOwnerOrPool.selector);
    }
    _;
  }

  /**
   * @dev {notDuringAutoswap}
   *
   * Throws if called during an autoswap
   */
  modifier notDuringAutoswap() {
    if (_autoSwapInProgress) {
      _revert(CannotPerformDuringAutoswap.selector);
    }
    _;
  }

  /**
   * @dev function {_decodeBaseParams}
   *
   * Decode NFT Parameters
   *
   * @param projectOwner_ The owner of this contract
   * @param encodedBaseParams_ The base params encoded into a bytes array
   */
  function _decodeBaseParams(
    address projectOwner_,
    bytes memory encodedBaseParams_
  ) internal {
    _transferOwnership(projectOwner_);

    (_name, _symbol) = abi.decode(encodedBaseParams_, (string, string));
  }

  /**
   * @dev function {_processSupplyParams}
   *
   * Process provided supply params
   *
   * @param erc20SupplyParameters_ The supply params
   * @param erc20PoolParameters_ The pool params
   */
  function _processSupplyParams(
    ERC20SupplyParameters memory erc20SupplyParameters_,
    ERC20PoolParameters memory erc20PoolParameters_
  ) internal {
    if (
      erc20SupplyParameters_.maxSupply !=
      (erc20SupplyParameters_.lpSupply +
        erc20SupplyParameters_.projectSupply +
        erc20PoolParameters_.poolSupply)
    ) {
      _revert(SupplyTotalMismatch.selector);
    }

    if (erc20SupplyParameters_.maxSupply > type(uint120).max) {
      _revert(MaxSupplyTooHigh.selector);
    }

    if (erc20SupplyParameters_.lpLockupInDays > type(uint88).max) {
      _revert(LPLockUpMustFitUint88.selector);
    }

    if (
      erc20SupplyParameters_.botProtectionDurationInSeconds > type(uint128).max
    ) {
      _revert(botProtectionDurationInSecondsMustFitUint128.selector);
    }

    if (erc20SupplyParameters_.maxTokensPerWallet > type(uint120).max) {
      _revert(LimitTooHigh.selector);
    }

    if (erc20SupplyParameters_.maxTokensPerTxn > type(uint120).max) {
      _revert(LimitTooHigh.selector);
    }

    maxTokensPerWallet = uint120(
      erc20SupplyParameters_.maxTokensPerWallet * (10 ** decimals())
    );
    maxTokensPerTransaction = uint120(
      erc20SupplyParameters_.maxTokensPerTxn * (10 ** decimals())
    );
    lpLockupInDays = uint88(erc20SupplyParameters_.lpLockupInDays);
    burnLPTokens = erc20SupplyParameters_.burnLPTokens;

    _unlimited.add(erc20SupplyParameters_.projectSupplyRecipient);
    _unlimited.add(address(this));
    _unlimited.add(address(0));
  }

  /**
   * @dev function {_processTaxParams}
   *
   * Process provided tax params
   *
   * @param erc20TaxParameters_ The tax params
   */
  function _processTaxParams(
    ERC20TaxParameters memory erc20TaxParameters_
  ) internal returns (bool tokenHasTax_) {
    /**
     * @dev We use the immutable var {_tokenHasTax} to avoid unneccesary storage writes and reads. If this
     * token does NOT have tax applied then there is no need to store or read these parameters, and we can
     * avoid this simply by checking the immutable var. Pass back the value for this var from this method.
     */
    if (
      erc20TaxParameters_.projectBuyTaxBasisPoints == 0 &&
      erc20TaxParameters_.projectSellTaxBasisPoints == 0 &&
      erc20TaxParameters_.metadropBuyTaxBasisPoints == 0 &&
      erc20TaxParameters_.metadropSellTaxBasisPoints == 0
    ) {
      return false;
    } else {
      // Validate that the sum of all buy deductions does not equal or exceed
      // 10,000 basis points (i.e. 100%).
      if (
        (erc20TaxParameters_.projectBuyTaxBasisPoints +
          erc20TaxParameters_.metadropBuyTaxBasisPoints +
          erc20TaxParameters_.autoBurnBasisPoints) >= CONST_BP_DENOM
      ) {
        _revert(DeductionsOnBuyExceedOrEqualOneHundredPercent.selector);
      }

      projectBuyTaxBasisPoints = uint16(
        erc20TaxParameters_.projectBuyTaxBasisPoints
      );
      projectSellTaxBasisPoints = uint16(
        erc20TaxParameters_.projectSellTaxBasisPoints
      );
      metadropBuyTaxBasisPoints = uint16(
        erc20TaxParameters_.metadropBuyTaxBasisPoints
      );
      metadropSellTaxBasisPoints = uint16(
        erc20TaxParameters_.metadropSellTaxBasisPoints
      );

      if (
        erc20TaxParameters_.taxSwapThresholdBasisPoints <
        CONST_MIN_SWAP_THRESHOLD_BP
      ) {
        _revert(SwapThresholdTooLow.selector);
      }

      swapThresholdBasisPoints = uint16(
        erc20TaxParameters_.taxSwapThresholdBasisPoints
      );

      projectTaxRecipient = erc20TaxParameters_.projectTaxRecipient;
      return true;
    }
  }

  /**
   * @dev function {_mintBalances}
   *
   * Mint initial balances
   *
   * @param lpMint_ The number of tokens for liquidity
   * @param projectMint_ The number of tokens for the project treasury
   * @param poolMint_ The number of tokens for the launch pool
   */
  function _mintBalances(
    uint256 lpMint_,
    uint256 projectMint_,
    uint256 poolMint_
  ) internal {
    if (lpMint_ > 0) {
      _mint(address(this), lpMint_);
    }

    if (projectMint_ > 0) {
      _mint(projectSupplyRecipient, projectMint_);
    }

    if (poolMint_ > 0) {
      _mint(driPool, poolMint_);
    }
  }

  /**
   * @dev function {_createPair}
   *
   * Create the uniswap pair
   *
   * @return uniswapV2Pair_ The pair address
   */
  function _createPair() internal returns (address uniswapV2Pair_) {
    if (_totalSupply > 0) {
      uniswapV2Pair_ = IUniswapV2Factory(_uniswapRouter.factory()).createPair(
        address(this),
        _uniswapRouter.WETH()
      );

      _liquidityPools.add(uniswapV2Pair_);
      emit LiquidityPoolCreated(uniswapV2Pair_);
    }
    _unlimited.add(address(_uniswapRouter));
    _unlimited.add(uniswapV2Pair_);
    return (uniswapV2Pair_);
  }

  /**
   * @dev function {addInitialLiquidity}
   *
   * Add initial liquidity to the uniswap pair
   *
   * @param vaultFee_ The vault fee in wei. This must match the required fee from the external vault contract.
   * @param lpLockupInDaysOverride_ The number of days to lock liquidity NOTE you can pass 0 to use the stored value.
   * This value is an override, and will override a stored value which is LOWER that it. If the value you are passing is
   * LOWER than the stored value the stored value will not be reduced.
   *
   * Example usage 1: When creating the coin the lpLockupInDays is set to 0. This means that on this call the
   * user can set the lockup to any value they like, as all integer values greater than zero will be used to override
   * that set in storage.
   *
   * Example usage 2: When using a DRI Pool the lockup period is set on this contract and the pool need not know anything
   * about this setting. The pool can pass back a 0 on this call and know that the existing value stored on this contract
   * will be used.
   * @param burnLPTokensOverride_ If the LP tokens should be burned (otherwise they are locked). This is an override field
   * that can ONLY be used to override a held value of FALSE with a new value of TRUE.
   *
   * Example usage 1: When creating the coin the user didn't add liquidity, or specify that the LP tokens were to be burned.
   * So burnLPTokens is held as FALSE. When they add liquidity they want to lock tokens, so they pass this in as FALSE again,
   * and it remains FALSE.
   *
   * Example usage 2: As above, but when later adding liquidity the user wants to burn the LP. So the stored value is FALSE
   * and the user passes TRUE into this method. The TRUE overrides the held value of FALSE and the tokens are burned.
   *
   * Example uusage 3: The user is using a DRI pool and they have specified on the coin creation that the LP tokens are to
   * be burned. This contract therefore holds TRUE for burnLPTokens. The DRI pool does not need to know what the user has
   * selected. It can safely pass back FALSE to this method call and the stored value of TRUE will remain, resulting in the
   * LP tokens being burned.
   */
  function addInitialLiquidity(
    uint256 vaultFee_,
    uint256 lpLockupInDaysOverride_,
    bool burnLPTokensOverride_
  ) external payable onlyOwnerFactoryOrPool {
    uint256 ethForLiquidity;

    if ((burnLPTokens == false) && (burnLPTokensOverride_ == true)) {
      burnLPTokens = true;
    }

    if (burnLPTokens) {
      if (msg.value == 0) {
        _revert(NoETHForLiquidityPair.selector);
      }
      ethForLiquidity = msg.value;
    } else {
      if (vaultFee_ >= msg.value) {
        // The amount of ETH MUST exceed the vault fee, otherwise what liquidity are we adding?
        _revert(NoETHForLiquidityPair.selector);
      }
      ethForLiquidity = msg.value - vaultFee_;
    }

    if (lpLockupInDaysOverride_ > lpLockupInDays) {
      lpLockupInDays = uint88(lpLockupInDaysOverride_);
    }

    _addInitialLiquidity(ethForLiquidity, vaultFee_);
  }

  /**
   * @dev function {_addInitialLiquidity}
   *
   * Add initial liquidity to the uniswap pair (internal function that does processing)
   *
   * @param ethAmount_ The amount of ETH passed into the call
   * @param vaultFee_ The vault fee in wei. This must match the required fee from the external vault contract.
   */
  function _addInitialLiquidity(
    uint256 ethAmount_,
    uint256 vaultFee_
  ) internal {
    // Funded date is the date of first funding. We can only add initial liquidity once. If this date is set,
    // we cannot proceed
    if (fundedDate != 0) {
      _revert(InitialLiquidityAlreadyAdded.selector);
    }

    fundedDate = uint32(block.timestamp);
    fundedBlock = uint32(block.number);

    // Can only do this if this contract holds tokens:
    if (balanceOf(address(this)) == 0) {
      _revert(NoTokenForLiquidityPair.selector);
    }

    // Approve the uniswap router for an inifinite amount (max uint256)
    // This means that we don't need to worry about later incrememtal
    // approvals on tax swaps, as the uniswap router allowance will never
    // be decreased (see code in decreaseAllowance for reference)
    _approve(address(this), address(_uniswapRouter), type(uint256).max);

    // Add the liquidity:
    (uint256 amountA, uint256 amountB, uint256 lpTokens) = _uniswapRouter
      .addLiquidityETH{value: ethAmount_}(
      address(this),
      balanceOf(address(this)),
      0,
      0,
      address(this),
      block.timestamp
    );

    emit InitialLiquidityAdded(amountA, amountB, lpTokens);

    // We now set this to false so that future transactions can be eligibile for autoswaps
    _autoSwapInProgress = false;

    // Are we locking, or burning?
    if (burnLPTokens) {
      _burnLiquidity(lpTokens);
    } else {
      // Lock the liquidity:
      _addLiquidityToVault(vaultFee_, lpTokens);
    }
  }

  /**
   * @dev function {_addLiquidityToVault}
   *
   * Lock initial liquidity on vault contract
   *
   * @param vaultFee_ The vault fee in wei. This must match the required fee from the external vault contract.
   * @param lpTokens_ The amount of LP tokens to be locked
   */
  function _addLiquidityToVault(uint256 vaultFee_, uint256 lpTokens_) internal {
    IERC20(uniswapV2Pair).approve(address(_tokenVault), lpTokens_);

    _tokenVault.lockLPToken{value: vaultFee_}(
      uniswapV2Pair,
      IERC20(uniswapV2Pair).balanceOf(address(this)),
      block.timestamp + (lpLockupInDays * 1 days),
      payable(address(0)),
      true,
      payable(lpOwner)
    );

    emit LiquidityLocked(lpTokens_, lpLockupInDays);
  }

  /**
   * @dev function {_burnLiquidity}
   *
   * Burn LP tokens
   *
   * @param lpTokens_ The amount of LP tokens to be locked
   */
  function _burnLiquidity(uint256 lpTokens_) internal {
    IERC20(uniswapV2Pair).transfer(address(0), lpTokens_);

    emit LiquidityBurned(lpTokens_);
  }

  /**
   * @dev function {isLiquidityPool}
   *
   * Return if an address is a liquidity pool
   *
   * @param queryAddress_ The address being queried
   * @return bool The address is / isn't a liquidity pool
   */
  function isLiquidityPool(address queryAddress_) public view returns (bool) {
    /** @dev We check the uniswapV2Pair address first as this is an immutable variable and therefore does not need
     * to be fetched from storage, saving gas if this address IS the uniswapV2Pool. We also add this address
     * to the enumerated set for ease of reference (for example it is returned in the getter), and it does
     * not add gas to any other calls, that still complete in 0(1) time.
     */
    return (queryAddress_ == uniswapV2Pair ||
      _liquidityPools.contains(queryAddress_));
  }

  /**
   * @dev function {liquidityPools}
   *
   * Returns a list of all liquidity pools
   *
   * @return liquidityPools_ a list of all liquidity pools
   */
  function liquidityPools()
    external
    view
    returns (address[] memory liquidityPools_)
  {
    return (_liquidityPools.values());
  }

  /**
   * @dev function {addLiquidityPool} onlyOwner
   *
   * Allows the manager to add a liquidity pool to the pool enumerable set
   *
   * @param newLiquidityPool_ The address of the new liquidity pool
   */
  function addLiquidityPool(address newLiquidityPool_) public onlyOwner {
    // Don't allow calls that didn't pass an address:
    if (newLiquidityPool_ == address(0)) {
      _revert(LiquidityPoolCannotBeAddressZero.selector);
    }
    // Only allow smart contract addresses to be added, as only these can be pools:
    if (newLiquidityPool_.code.length == 0) {
      _revert(LiquidityPoolMustBeAContractAddress.selector);
    }
    // Add this to the enumerated list:
    _liquidityPools.add(newLiquidityPool_);
    emit LiquidityPoolAdded(newLiquidityPool_);
  }

  /**
   * @dev function {removeLiquidityPool} onlyOwner
   *
   * Allows the manager to remove a liquidity pool
   *
   * @param removedLiquidityPool_ The address of the old removed liquidity pool
   */
  function removeLiquidityPool(
    address removedLiquidityPool_
  ) external onlyOwner {
    // Remove this from the enumerated list:
    _liquidityPools.remove(removedLiquidityPool_);
    emit LiquidityPoolRemoved(removedLiquidityPool_);
  }

  /**
   * @dev function {isUnlimited}
   *
   * Return if an address is unlimited (is not subject to per txn and per wallet limits)
   *
   * @param queryAddress_ The address being queried
   * @return bool The address is / isn't unlimited
   */
  function isUnlimited(address queryAddress_) public view returns (bool) {
    return (_unlimited.contains(queryAddress_));
  }

  /**
   * @dev function {unlimitedAddresses}
   *
   * Returns a list of all unlimited addresses
   *
   * @return unlimitedAddresses_ a list of all unlimited addresses
   */
  function unlimitedAddresses()
    external
    view
    returns (address[] memory unlimitedAddresses_)
  {
    return (_unlimited.values());
  }

  /**
   * @dev function {addUnlimited} onlyOwner
   *
   * Allows the manager to add an unlimited address
   *
   * @param newUnlimited_ The address of the new unlimited address
   */
  function addUnlimited(address newUnlimited_) external onlyOwner {
    // Add this to the enumerated list:
    _unlimited.add(newUnlimited_);
    emit UnlimitedAddressAdded(newUnlimited_);
  }

  /**
   * @dev function {removeUnlimited} onlyOwner
   *
   * Allows the manager to remove an unlimited address
   *
   * @param removedUnlimited_ The address of the old removed unlimited address
   */
  function removeUnlimited(address removedUnlimited_) external onlyOwner {
    // Remove this from the enumerated list:
    _unlimited.remove(removedUnlimited_);
    emit UnlimitedAddressRemoved(removedUnlimited_);
  }

  /**
   * @dev function {isValidCaller}
   *
   * Return if an address is a valid caller
   *
   * @param queryHash_ The code hash being queried
   * @return bool The address is / isn't a valid caller
   */
  function isValidCaller(bytes32 queryHash_) public view returns (bool) {
    return (_validCallerCodeHashes.contains(queryHash_));
  }

  /**
   * @dev function {validCallers}
   *
   * Returns a list of all valid caller code hashes
   *
   * @return validCallerHashes_ a list of all valid caller code hashes
   */
  function validCallers()
    external
    view
    returns (bytes32[] memory validCallerHashes_)
  {
    return (_validCallerCodeHashes.values());
  }

  /**
   * @dev function {addValidCaller} onlyOwner
   *
   * Allows the owner to add the hash of a valid caller
   *
   * @param newValidCallerHash_ The hash of the new valid caller
   */
  function addValidCaller(bytes32 newValidCallerHash_) external onlyOwner {
    _validCallerCodeHashes.add(newValidCallerHash_);
    emit ValidCallerAdded(newValidCallerHash_);
  }

  /**
   * @dev function {removeValidCaller} onlyOwner
   *
   * Allows the owner to remove a valid caller
   *
   * @param removedValidCallerHash_ The hash of the old removed valid caller
   */
  function removeValidCaller(
    bytes32 removedValidCallerHash_
  ) external onlyOwner {
    // Remove this from the enumerated list:
    _validCallerCodeHashes.remove(removedValidCallerHash_);
    emit ValidCallerRemoved(removedValidCallerHash_);
  }

  /**
   * @dev function {setProjectTaxRecipient} onlyOwner
   *
   * Allows the manager to set the project tax recipient address
   *
   * @param projectTaxRecipient_ New recipient address
   */
  function setProjectTaxRecipient(
    address projectTaxRecipient_
  ) external onlyOwner {
    projectTaxRecipient = projectTaxRecipient_;
    emit ProjectTaxRecipientUpdated(projectTaxRecipient_);
  }

  /**
   * @dev function {setSwapThresholdBasisPoints} onlyOwner
   *
   * Allows the manager to set the autoswap threshold
   *
   * @param swapThresholdBasisPoints_ New swap threshold in basis points
   */
  function setSwapThresholdBasisPoints(
    uint16 swapThresholdBasisPoints_
  ) external onlyOwner {
    if (swapThresholdBasisPoints < CONST_MIN_SWAP_THRESHOLD_BP) {
      _revert(SwapThresholdTooLow.selector);
    }
    uint256 oldswapThresholdBasisPoints = swapThresholdBasisPoints;
    swapThresholdBasisPoints = swapThresholdBasisPoints_;
    emit AutoSwapThresholdUpdated(
      oldswapThresholdBasisPoints,
      swapThresholdBasisPoints_
    );
  }

  /**
   * @dev function {setProjectTaxRates} onlyOwner
   *
   * Change the tax rates, subject to only ever decreasing
   *
   * @param newProjectBuyTaxBasisPoints_ The new buy tax rate
   * @param newProjectSellTaxBasisPoints_ The new sell tax rate
   */
  function setProjectTaxRates(
    uint16 newProjectBuyTaxBasisPoints_,
    uint16 newProjectSellTaxBasisPoints_
  ) external onlyOwner {
    uint16 oldBuyTaxBasisPoints = projectBuyTaxBasisPoints;
    uint16 oldSellTaxBasisPoints = projectSellTaxBasisPoints;
    // Cannot increase, down only
    if (newProjectBuyTaxBasisPoints_ > oldBuyTaxBasisPoints) {
      _revert(CanOnlyReduce.selector);
    }
    // Cannot increase, down only
    if (newProjectSellTaxBasisPoints_ > oldSellTaxBasisPoints) {
      _revert(CanOnlyReduce.selector);
    }
    projectBuyTaxBasisPoints = newProjectBuyTaxBasisPoints_;
    projectSellTaxBasisPoints = newProjectSellTaxBasisPoints_;

    // We set the metadrop tax rates off of the project tax rates:
    //
    // 1) If the project tax rate is zero then the metadrop tax rate is zero
    // 2) If the project tax rate is not zero the metadrop tax rate is the
    //    greater of:
    //    a) The metadrop tax proportion basis points of the project rate
    //    b) the base metadrop tax rate.
    //
    // Examples:
    //
    // A) The project buy tax rate is zero and the sell tax rate is 3%. The metadrop
    // tax proportion basis points is 1000, meaning the metadrop proportion is 10% of the
    // project tax rate. The base metadrop tax rate is 50 basis points i.e. 0.5%.
    //
    // * Metadrop buy tax = 0% (as the project buy tax is zero)
    // * Metadrop sell tax = 0.5%. 10% of the project sell tax is 0.3%. As this is below
    // the base level of 0.5% we set the metadrop tax to 0.5%
    //
    // B) The project buy tax rate is 4% and the sell tax rate is 20%. The metadrop tax
    // proportion basis points is 1000, meaning the metadrop proportion is 10% of the
    // project tax rate. The base metadrop tax rate is 50 basis points i.e. 0.5%.
    //
    // * Metadrop buy tax = 0.5%. 10% of the project rate would be 0.4%, so we use the base rate)
    // * Metadrop sell tax = 2%. 10% of the project rate is 2%, which is higher than the
    //   base rate of 0.5%.

    uint16 oldMetadropBuyTaxBasisPoints = metadropBuyTaxBasisPoints;
    uint16 oldMetadropSellTaxBasisPoints = metadropSellTaxBasisPoints;

    // Process the buy tax rate first:
    if (newProjectBuyTaxBasisPoints_ == 0) {
      metadropBuyTaxBasisPoints = 0;
    } else {
      uint256 derivedMetadropBuyTaxRate = (newProjectBuyTaxBasisPoints_ *
        metadropBuyTaxProportionBasisPoints) / CONST_BP_DENOM;
      if (derivedMetadropBuyTaxRate < metadropMinBuyTaxBasisPoints) {
        metadropBuyTaxBasisPoints = uint16(metadropMinBuyTaxBasisPoints);
      } else {
        metadropBuyTaxBasisPoints = uint16(derivedMetadropBuyTaxRate);
      }
    }

    // And now the sell tax rate:
    if (newProjectSellTaxBasisPoints_ == 0) {
      metadropSellTaxBasisPoints = 0;
    } else {
      uint256 derivedMetadropSellTaxRate = (newProjectSellTaxBasisPoints_ *
        metadropSellTaxProportionBasisPoints) / CONST_BP_DENOM;
      if (derivedMetadropSellTaxRate < metadropMinSellTaxBasisPoints) {
        metadropSellTaxBasisPoints = uint16(metadropMinSellTaxBasisPoints);
      } else {
        metadropSellTaxBasisPoints = uint16(derivedMetadropSellTaxRate);
      }
    }

    // Emit a message if there has been a change:
    if (
      oldMetadropBuyTaxBasisPoints != metadropBuyTaxBasisPoints ||
      oldMetadropSellTaxBasisPoints != metadropSellTaxBasisPoints
    ) {
      emit MetadropTaxBasisPointsChanged(
        oldMetadropBuyTaxBasisPoints,
        metadropBuyTaxBasisPoints,
        oldMetadropSellTaxBasisPoints,
        metadropSellTaxBasisPoints
      );
    }

    emit ProjectTaxBasisPointsChanged(
      oldBuyTaxBasisPoints,
      newProjectBuyTaxBasisPoints_,
      oldSellTaxBasisPoints,
      newProjectSellTaxBasisPoints_
    );
  }

  /**
   * @dev function {setLimits} onlyOwner
   *
   * Change the limits on transactions and holdings
   *
   * @param newMaxTokensPerTransaction_ The new per txn limit
   * @param newMaxTokensPerWallet_ The new tokens per wallet limit
   */
  function setLimits(
    uint256 newMaxTokensPerTransaction_,
    uint256 newMaxTokensPerWallet_
  ) external onlyOwner {
    if (newMaxTokensPerWallet_ > type(uint120).max) {
      _revert(LimitTooHigh.selector);
    }

    if (newMaxTokensPerTransaction_ > type(uint120).max) {
      _revert(LimitTooHigh.selector);
    }

    uint256 oldMaxTokensPerTransaction = maxTokensPerTransaction;
    uint256 oldMaxTokensPerWallet = maxTokensPerWallet;
    // Limit can only be increased:
    if (
      (oldMaxTokensPerTransaction == 0 && newMaxTokensPerTransaction_ != 0) ||
      (oldMaxTokensPerWallet == 0 && newMaxTokensPerWallet_ != 0)
    ) {
      _revert(LimitsCanOnlyBeRaised.selector);
    }
    if (
      ((newMaxTokensPerTransaction_ != 0) &&
        newMaxTokensPerTransaction_ < oldMaxTokensPerTransaction) ||
      ((newMaxTokensPerWallet_ != 0) &&
        newMaxTokensPerWallet_ < oldMaxTokensPerWallet)
    ) {
      _revert(LimitsCanOnlyBeRaised.selector);
    }

    maxTokensPerTransaction = uint120(newMaxTokensPerTransaction_);
    maxTokensPerWallet = uint120(newMaxTokensPerWallet_);

    emit LimitsUpdated(
      oldMaxTokensPerTransaction,
      newMaxTokensPerTransaction_,
      oldMaxTokensPerWallet,
      newMaxTokensPerWallet_
    );
  }

  /**
   * @dev function {limitsEnforced}
   *
   * Return if limits are enforced on this contract
   *
   * @return bool : they are / aren't
   */
  function limitsEnforced() public view returns (bool) {
    // Limits are not enforced if
    // this is renounced AND after then protection end date
    // OR prior to LP funding:
    // The second clause of 'fundedDate == 0' isn't strictly needed, since with a funded
    // date of 0 we would always expect the block.timestamp to be less than 0 plus
    // the botProtectionDurationInSeconds. But, to cover the miniscule chance of a user
    // selecting a truly enormous bot protection period, such that when added to 0 it
    // is more than the current block.timestamp, we have included this second clause. There
    // is no permanent gas overhead (the logic will be returning from the first clause after
    // the bot protection period has expired). During the bot protection period there is a minor
    // gas overhead from evaluating the fundedDate == 0 (which will be false), but this is minimal.
    if (
      (owner() == address(0) &&
        block.timestamp > fundedDate + botProtectionDurationInSeconds) ||
      fundedDate == 0
    ) {
      return false;
    } else {
      // LP has been funded AND we are within the protection period:
      return true;
    }
  }

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

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

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

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

  /**
   * @dev getMetadropBuyTaxBasisPoints
   *
   * Return the metadrop buy tax basis points given the timed expiry
   */
  function getMetadropBuyTaxBasisPoints() public view returns (uint256) {
    // If we are outside the metadrop tax period this is ZERO
    if (block.timestamp > (fundedDate + (metadropTaxPeriodInDays * 1 days))) {
      return 0;
    } else {
      return metadropBuyTaxBasisPoints;
    }
  }

  /**
   * @dev getMetadropSellTaxBasisPoints
   *
   * Return the metadrop sell tax basis points given the timed expiry
   */
  function getMetadropSellTaxBasisPoints() public view returns (uint256) {
    // If we are outside the metadrop tax period this is ZERO
    if (block.timestamp > (fundedDate + (metadropTaxPeriodInDays * 1 days))) {
      return 0;
    } else {
      return metadropSellTaxBasisPoints;
    }
  }

  /**
   * @dev totalBuyTaxBasisPoints
   *
   * Provide easy to view tax total:
   */
  function totalBuyTaxBasisPoints() public view returns (uint256) {
    return projectBuyTaxBasisPoints + getMetadropBuyTaxBasisPoints();
  }

  /**
   * @dev totalSellTaxBasisPoints
   *
   * Provide easy to view tax total:
   */
  function totalSellTaxBasisPoints() public view returns (uint256) {
    return projectSellTaxBasisPoints + getMetadropSellTaxBasisPoints();
  }

  /**
   * @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(IERC20) returns (bool) {
    address owner = _msgSender();
    _transfer(
      owner,
      to,
      amount,
      (isLiquidityPool(owner) || isLiquidityPool(to))
    );
    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, (isLiquidityPool(from) || isLiquidityPool(to)));
    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);
    if (currentAllowance < subtractedValue) {
      _revert(AllowanceDecreasedBelowZero.selector);
    }
    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,
    bool applyTax
  ) internal virtual {
    _beforeTokenTransfer(from, to, amount);

    // Perform pre-tax validation (e.g. amount doesn't exceed balance, max txn amount)
    uint256 fromBalance = _pretaxValidationAndLimits(from, to, amount);

    // Perform autoswap if eligible
    _autoSwap(from, to);

    // Process taxes
    uint256 amountMinusDeductions = _taxProcessing(applyTax, to, from, amount);

    // Process autoburn
    amountMinusDeductions = _autoburnProcessing(
      from,
      amount,
      amountMinusDeductions
    );

    // Perform post-tax validation (e.g. total balance after post-tax amount applied)
    _posttaxValidationAndLimits(from, to, amountMinusDeductions);

    _balances[from] = fromBalance - amount;
    _balances[to] += amountMinusDeductions;

    emit Transfer(from, to, amountMinusDeductions);

    _afterTokenTransfer(from, to, amount);
  }

  /**
   * @dev function {_pretaxValidationAndLimits}
   *
   * Perform validation on pre-tax amounts
   *
   * @param from_ From address for the transaction
   * @param to_ To address for the transaction
   * @param amount_ Amount of the transaction
   */
  function _pretaxValidationAndLimits(
    address from_,
    address to_,
    uint256 amount_
  ) internal view returns (uint256 fromBalance_) {
    // This can't be a transfer to the liquidity pool before the funding date
    // UNLESS the from address is this contract. This ensures that the initial
    // LP funding transaction is from this contract using the supply of tokens
    // designated for the LP pool, and therefore the initial price in the pool
    // is being set as expected.
    //
    // This protects from, for example, tokens from a team minted supply being
    // paired with ETH and added to the pool, setting the initial price, BEFORE
    // the initial liquidity is added through this contract.
    if (to_ == uniswapV2Pair && from_ != address(this) && fundedDate == 0) {
      _revert(InitialLiquidityNotYetAdded.selector);
    }

    if (from_ == address(0)) {
      _revert(TransferFromZeroAddress.selector);
    }

    if (to_ == address(0)) {
      _revert(TransferToZeroAddress.selector);
    }

    fromBalance_ = _balances[from_];

    if (fromBalance_ < amount_) {
      _revert(TransferAmountExceedsBalance.selector);
    }

    if (
      limitsEnforced() &&
      (maxTokensPerTransaction != 0) &&
      ((isLiquidityPool(from_) && !isUnlimited(to_)) ||
        (isLiquidityPool(to_) && !isUnlimited(from_)))
    ) {
      // Liquidity pools aren't always going to round cleanly. This can (and does)
      // mean that a limit of 5,000 tokens (for example) will trigger on a transfer
      // of 5,000 tokens, as the transfer is actually for 5,000.00000000000000213.
      // While 4,999 will work fine, it isn't hugely user friendly. So we buffer
      // the limit with rounding decimals, which in all cases are considerably less
      // than one whole token:
      uint256 roundedLimited;

      unchecked {
        roundedLimited = maxTokensPerTransaction + CONST_ROUND_DEC;
      }

      if (amount_ > roundedLimited) {
        _revert(MaxTokensPerTxnExceeded.selector);
      }
    }

    return (fromBalance_);
  }

  /**
   * @dev function {_posttaxValidationAndLimits}
   *
   * Perform validation on post-tax amounts
   *
   * @param to_ To address for the transaction
   * @param amount_ Amount of the transaction
   */
  function _posttaxValidationAndLimits(
    address from_,
    address to_,
    uint256 amount_
  ) internal view {
    if (
      limitsEnforced() &&
      (maxTokensPerWallet != 0) &&
      !isUnlimited(to_) &&
      // If this is a buy (from a liquidity pool), we apply if the to_
      // address isn't noted as unlimited:
      (isLiquidityPool(from_) && !isUnlimited(to_))
    ) {
      // Liquidity pools aren't always going to round cleanly. This can (and does)
      // mean that a limit of 5,000 tokens (for example) will trigger on a max holding
      // of 5,000 tokens, as the transfer to achieve that is actually for
      // 5,000.00000000000000213. While 4,999 will work fine, it isn't hugely user friendly.
      // So we buffer the limit with rounding decimals, which in all cases are considerably
      // less than one whole token:
      uint256 roundedLimited;

      unchecked {
        roundedLimited = maxTokensPerWallet + CONST_ROUND_DEC;
      }

      if ((amount_ + balanceOf(to_) > roundedLimited)) {
        _revert(MaxTokensPerWalletExceeded.selector);
      }
    }
  }

  /**
   * @dev function {_taxProcessing}
   *
   * Perform tax processing
   *
   * @param applyTax_ Do we apply tax to this transaction?
   * @param to_ The reciever of the token
   * @param from_ The sender of the token
   * @param sentAmount_ The amount being send
   * @return amountLessTax_ The amount that will be recieved, i.e. the send amount minus tax
   */
  function _taxProcessing(
    bool applyTax_,
    address to_,
    address from_,
    uint256 sentAmount_
  ) internal returns (uint256 amountLessTax_) {
    amountLessTax_ = sentAmount_;
    if (_tokenHasTax && applyTax_ && !_autoSwapInProgress) {
      uint256 tax;

      // on sell
      if (isLiquidityPool(to_) && totalSellTaxBasisPoints() > 0) {
        if (projectSellTaxBasisPoints > 0) {
          uint256 projectTax = ((sentAmount_ * projectSellTaxBasisPoints) /
            CONST_BP_DENOM);
          projectTaxPendingSwap += uint128(projectTax);
          tax += projectTax;
        }
        uint256 metadropSellTax = getMetadropSellTaxBasisPoints();
        if (metadropSellTax > 0) {
          uint256 metadropTax = ((sentAmount_ * metadropSellTax) /
            CONST_BP_DENOM);
          metadropTaxPendingSwap += uint128(metadropTax);
          tax += metadropTax;
        }
      }
      // on buy
      else if (isLiquidityPool(from_) && totalBuyTaxBasisPoints() > 0) {
        if (projectBuyTaxBasisPoints > 0) {
          uint256 projectTax = ((sentAmount_ * projectBuyTaxBasisPoints) /
            CONST_BP_DENOM);
          projectTaxPendingSwap += uint128(projectTax);
          tax += projectTax;
        }
        uint256 metadropBuyTax = getMetadropBuyTaxBasisPoints();
        if (metadropBuyTax > 0) {
          uint256 metadropTax = ((sentAmount_ * metadropBuyTax) /
            CONST_BP_DENOM);
          metadropTaxPendingSwap += uint128(metadropTax);
          tax += metadropTax;
        }
      }

      if (tax > 0) {
        _balances[address(this)] += tax;
        emit Transfer(from_, address(this), tax);
        amountLessTax_ -= tax;
      }
    }
    return (amountLessTax_);
  }

  /**
   * @dev function {_autoburnProcessing}
   *
   * Perform autoburn processing
   *
   * @param from_ The sender of the token
   * @param originalSentAmount_ The original amount being sent, before any deductions (if appropriate)
   * @param currentRecipientAmount_ The amount the recipient is currently due to receive
   * @return amountLessBurn_ The amount that will be recieved, i.e. the currentRecipientAmount_
   * minus the burn applied here
   */
  function _autoburnProcessing(
    address from_,
    uint256 originalSentAmount_,
    uint256 currentRecipientAmount_
  ) internal returns (uint256 amountLessBurn_) {
    amountLessBurn_ = currentRecipientAmount_;
    // Perform autoBurn processing, if appropriate:
    if (
      autoBurnDurationInBlocks != 0 &&
      autoBurnBasisPoints != 0 &&
      !_autoSwapInProgress &&
      isLiquidityPool(from_)
    ) {
      uint256 blocksElapsed = block.number - fundedBlock;
      if (blocksElapsed < autoBurnDurationInBlocks) {
        // Get the blocks remaining in the autoburn period. The more blocks
        // remaining, the higher the proportion of the burn we apply:
        uint256 burnBlocksRemaining = autoBurnDurationInBlocks - blocksElapsed;
        // Calculate the linear burn basis point per remaining block. For example, if our
        // burn basis points = 1500 (15%) and we are burning for three blocks then this
        // will be 1500 / 3 = 500 (5%):
        uint256 linearBurnPerRemainingBlock = autoBurnBasisPoints /
          autoBurnDurationInBlocks;
        // Finally, determine the burn basis points for this block by multiplying the per remaining
        // block burn % by the number of blocks remaining. To follow our example, in the 0th
        // block since funding there are three blocks remaining in the burn period, therefore
        // 500 * 3 = 1500 (15%). Two blocks after funding we have one block remaining in the burn
        // period, and therefore are burning 500 * 1 = 500 (5%). Three blocks after funding we do not
        // reach this point in the logic, as the blocksElapsed is 3 and needs to be UNDER 3 to enter
        // this code.
        uint256 burnBasisPointsForThisBlock = burnBlocksRemaining *
          linearBurnPerRemainingBlock;

        // This is eligible for burn. Send the basis points amount of
        // the originalSentAmount_ to the zero address:
        uint256 burnAmount = ((originalSentAmount_ *
          burnBasisPointsForThisBlock) / CONST_BP_DENOM);

        _burn(from_, burnAmount);
        amountLessBurn_ -= burnAmount;
      }
    }
    return (amountLessBurn_);
  }

  /**
   * @dev totalTaxPendingSwap
   *
   * Return the total tax awaiting swap:
   */
  function totalTaxPendingSwap() public view returns (uint256) {
    return projectTaxPendingSwap + metadropTaxPendingSwap;
  }

  /**
   * @dev function {_autoSwap}
   *
   * Automate the swap of accumulated tax fees to native token
   *
   * @param from_ The sender of the token
   * @param to_ The recipient of the token
   */
  function _autoSwap(address from_, address to_) internal {
    if (_tokenHasTax) {
      uint256 totalTaxBalance = totalTaxPendingSwap();
      uint256 swapBalance = totalTaxBalance;

      uint256 swapThresholdInTokens = (_totalSupply *
        swapThresholdBasisPoints) / CONST_BP_DENOM;

      if (_eligibleForSwap(from_, to_, swapBalance, swapThresholdInTokens)) {
        // Store that a swap back is in progress:
        _autoSwapInProgress = true;
        // Check if we need to reduce the amount of tokens for this swap:
        if (
          swapBalance >
          swapThresholdInTokens * CONST_MAX_SWAP_THRESHOLD_MULTIPLE
        ) {
          swapBalance =
            swapThresholdInTokens *
            CONST_MAX_SWAP_THRESHOLD_MULTIPLE;
        }
        // Perform the auto swap to native token:
        _swapTaxForNative(swapBalance, totalTaxBalance);
        // Flag that the autoswap is complete:
        _autoSwapInProgress = false;
      }
    }
  }

  /**
   * @dev function {_eligibleForSwap}
   *
   * Is the current transfer eligible for autoswap
   *
   * @param from_ The sender of the token
   * @param to_ The recipient of the token
   * @param taxBalance_ The current accumulated tax balance
   * @param swapThresholdInTokens_ The swap threshold as a token amount
   */
  function _eligibleForSwap(
    address from_,
    address to_,
    uint256 taxBalance_,
    uint256 swapThresholdInTokens_
  ) internal view returns (bool) {
    return (taxBalance_ >= swapThresholdInTokens_ &&
      !_autoSwapInProgress &&
      !isLiquidityPool(from_) &&
      from_ != address(_uniswapRouter) &&
      to_ != address(_uniswapRouter));
  }

  /**
   * @dev function {_swapTaxForNative}
   *
   * Swap tokens taken as tax for native token
   *
   * @param swapBalance_ The current accumulated tax balance to swap
   * @param totalTaxBalance_ The current accumulated total tax balance
   */
  function _swapTaxForNative(
    uint256 swapBalance_,
    uint256 totalTaxBalance_
  ) internal {
    uint256 preSwapBalance = address(this).balance;

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

    // Wrap external calls in try / catch to handle errors
    try
      _uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
        swapBalance_,
        0,
        path,
        address(this),
        block.timestamp + 600
      )
    {
      uint256 postSwapBalance = address(this).balance;

      uint256 balanceToDistribute = postSwapBalance - preSwapBalance;

      uint256 projectBalanceToDistribute = (balanceToDistribute *
        projectTaxPendingSwap) / totalTaxBalance_;

      uint256 metadropBalanceToDistribute = (balanceToDistribute *
        metadropTaxPendingSwap) / totalTaxBalance_;

      // We will not have swapped all tax tokens IF the amount was greater than the max auto swap.
      // We therefore cannot just set the pending swap counters to 0. Instead, in this scenario,
      // we must reduce them in proportion to the swap amount vs the remaining balance + swap
      // amount.
      //
      // For example:
      //  * swap Balance is 250
      //  * contract balance is 385.
      //  * projectTaxPendingSwap is 300
      //  * metadropTaxPendingSwap is 85.
      //
      // The new total for the projectTaxPendingSwap is:
      //   = 300 - ((300 * 250) / 385)
      //   = 300 - 194
      //   = 106
      // The new total for the metadropTaxPendingSwap is:
      //   = 85 - ((85 * 250) / 385)
      //   = 85 - 55
      //   = 30
      //

      if (swapBalance_ < totalTaxBalance_) {
        // Calculate the project tax spending swap reduction amount:
        uint256 projectTaxPendingSwapReduction = (projectTaxPendingSwap *
          swapBalance_) / totalTaxBalance_;
        projectTaxPendingSwap -= uint128(projectTaxPendingSwapReduction);

        // The metadrop tax pending swap reduction is therefore the total swap amount minus the
        // project tax spending swap reduction:
        metadropTaxPendingSwap -= uint128(
          swapBalance_ - projectTaxPendingSwapReduction
        );
      } else {
        (projectTaxPendingSwap, metadropTaxPendingSwap) = (0, 0);
      }

      // Distribute to treasuries:
      bool success;
      address weth;
      uint256 gas;

      if (projectBalanceToDistribute > 0) {
        // If no gas limit was provided or provided gas limit greater than gas left, just use the remaining gas.
        gas = (CONST_CALL_GAS_LIMIT == 0 || CONST_CALL_GAS_LIMIT > gasleft())
          ? gasleft()
          : CONST_CALL_GAS_LIMIT;

        // We limit the gas passed so that a called address cannot cause a block out of gas error:
        (success, ) = projectTaxRecipient.call{
          value: projectBalanceToDistribute,
          gas: gas
        }("");

        // If the ETH transfer fails, wrap the ETH and send it as WETH. We do this so that a called
        // address cannot cause this transfer to fail, either intentionally or by mistake:
        if (!success) {
          if (weth == address(0)) {
            weth = _uniswapRouter.WETH();
          }

          try IWETH(weth).deposit{value: projectBalanceToDistribute}() {
            try
              IERC20(address(weth)).transfer(
                projectTaxRecipient,
                projectBalanceToDistribute
              )
            {} catch {
              // Dont allow a failed external call (in this case to WETH) to stop a transfer.
              // Emit that this has occured and continue.
              emit ExternalCallError(1);
            }
          } catch {
            // Dont allow a failed external call (in this case to WETH) to stop a transfer.
            // Emit that this has occured and continue.
            emit ExternalCallError(2);
          }
        }
      }

      if (metadropBalanceToDistribute > 0) {
        // If no gas limit was provided or provided gas limit greater than gas left, just use the remaining gas.
        gas = (CONST_CALL_GAS_LIMIT == 0 || CONST_CALL_GAS_LIMIT > gasleft())
          ? gasleft()
          : CONST_CALL_GAS_LIMIT;

        (success, ) = metadropTaxRecipient.call{
          value: metadropBalanceToDistribute,
          gas: gas
        }("");

        // If the ETH transfer fails, wrap the ETH and send it as WETH. We do this so that a called
        // address cannot cause this transfer to fail, either intentionally or by mistake:
        if (!success) {
          if (weth == address(0)) {
            weth = _uniswapRouter.WETH();
          }
          try IWETH(weth).deposit{value: metadropBalanceToDistribute}() {
            try
              IERC20(address(weth)).transfer(
                metadropTaxRecipient,
                metadropBalanceToDistribute
              )
            {} catch {
              // Dont allow a failed external call (in this case to WETH) to stop a transfer.
              // Emit that this has occured and continue.
              emit ExternalCallError(3);
            }
          } catch {
            // Dont allow a failed external call (in this case to WETH) to stop a transfer.
            // Emit that this has occured and continue.
            emit ExternalCallError(4);
          }
        }
      }
    } catch {
      // Dont allow a failed external call (in this case to uniswap) to stop a transfer.
      // Emit that this has occured and continue.
      emit ExternalCallError(5);
    }
  }

  /**
   * @dev distributeTaxTokens
   *
   * Allows the distribution of tax tokens to the designated recipient(s)
   *
   * As part of standard processing the tax token balance being above the threshold
   * will trigger an autoswap to ETH and distribution of this ETH to the designated
   * recipients. This is automatic and there is no need for user involvement.
   *
   * As part of this swap there are a number of calculations performed, particularly
   * if the tax balance is above CONST_MAX_SWAP_THRESHOLD_MULTIPLE.
   *
   * Testing indicates that these calculations are safe. But given the data / code
   * interactions it remains possible that some edge case set of scenarios may cause
   * an issue with these calculations.
   *
   * This method is therefore provided as a 'fallback' option to safely distribute
   * accumulated taxes from the contract, with a direct transfer of the ERC20 tokens
   * themselves.
   */
  function distributeTaxTokens() external notDuringAutoswap {
    if (projectTaxPendingSwap > 0) {
      uint256 projectDistribution = projectTaxPendingSwap;
      projectTaxPendingSwap = 0;
      _transfer(address(this), projectTaxRecipient, projectDistribution, false);
    }

    if (metadropTaxPendingSwap > 0) {
      uint256 metadropDistribution = metadropTaxPendingSwap;
      metadropTaxPendingSwap = 0;
      _transfer(
        address(this),
        metadropTaxRecipient,
        metadropDistribution,
        false
      );
    }
  }

  /**
   * @dev function {rescueETH}
   *
   * A withdraw function to allow ETH to be rescued.
   *
   * This contract should never hold ETH. The only envisaged scenario where
   * it might hold ETH is a failed autoswap where the uniswap swap has completed,
   * the recipient of ETH reverts, the contract then wraps to WETH and the
   * wrap to WETH fails.
   *
   * This feels unlikely. But, for safety, we include this method.
   *
   * @param amount_ The amount to withdraw
   */
  function rescueETH(uint256 amount_) external notDuringAutoswap {
    (bool success, ) = projectTaxRecipient.call{value: amount_}("");
    if (!success) {
      _revert(TransferFailed.selector);
    }
  }

  /**
   * @dev function {rescueERC20}
   *
   * A withdraw function to allow ERC20s (except address(this)) to be rescued.
   *
   * This contract should never hold ERC20s other than tax tokens. The only envisaged
   * scenario where it might hold an ERC20 is a failed autoswap where the uniswap swap
   * has completed, the recipient of ETH reverts, the contract then wraps to WETH, the
   * wrap to WETH succeeds, BUT then the transfer of WETH fails.
   *
   * This feels even less likely than the scenario where ETH is held on the contract.
   * But, for safety, we include this method.
   *
   * @param token_ The ERC20 contract
   * @param amount_ The amount to withdraw
   */
  function rescueERC20(
    address token_,
    uint256 amount_
  ) external notDuringAutoswap {
    if (token_ == address(this)) {
      _revert(CannotWithdrawThisToken.selector);
    }
    IERC20(token_).safeTransfer(projectTaxRecipient, amount_);
  }

  /**
   * @dev function {rescueExcessToken}
   *
   * A withdraw function to allow ERC20s from this address that are above
   * the accrued tax balance to be rescued.
   */
  function rescueExcessToken(uint256 amount_) external notDuringAutoswap {
    uint256 excessToken = balanceOf(address(this)) - totalTaxPendingSwap();

    if (amount_ > excessToken) {
      _revert(AmountExceedsAvailable.selector);
    }

    IERC20(address(this)).safeTransfer(projectTaxRecipient, 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 {
    if (account == address(0)) {
      _revert(MintToZeroAddress.selector);
    }

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

    _totalSupply += uint120(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 {
    if (account == address(0)) {
      _revert(BurnFromTheZeroAddress.selector);
    }

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

    uint256 accountBalance = _balances[account];
    if (accountBalance < amount) {
      _revert(BurnExceedsBalance.selector);
    }

    unchecked {
      _balances[account] = accountBalance - amount;
      // Overflow not possible: amount <= accountBalance <= totalSupply.
      _totalSupply -= uint120(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 {
    if (owner == address(0)) {
      _revert(ApproveFromTheZeroAddress.selector);
    }

    if (spender == address(0)) {
      _revert(ApproveToTheZeroAddress.selector);
    }

    _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) {
      if (currentAllowance < amount) {
        _revert(InsufficientAllowance.selector);
      }

      unchecked {
        _approve(owner, spender, currentAllowance - amount);
      }
    }
  }

  /**
   * @dev Destroys a `value` amount of tokens from the caller.
   *
   * See {ERC20-_burn}.
   */
  function burn(uint256 value) public virtual {
    _burn(_msgSender(), value);
  }

  /**
   * @dev Destroys a `value` amount of 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
   * `value`.
   */
  function burnFrom(address account, uint256 value) public virtual {
    _spendAllowance(account, _msgSender(), value);
    _burn(account, value);
  }

  /**
   * @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 {}

  receive() external payable {}
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@                                                                                                @@
// @@   Metadrop has no affiliation with and does not endorse this token or its creators in any      @@
// @@   way, unless otherwise stated. For all terms and conditions associated with tokens launched   @@
// @@   using Metadrop software, refer to the terms published at metadrop[dot]com/legal.             @@
// @@                                                                                                @@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@