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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "../access/ownable/OwnableStorage.sol";
import "../access/ownable/IERC173.sol";
import "../introspection/ERC165.sol";
import "../metatx/ERC2771Context.sol";
import "../diamond/IDiamondCut.sol";
import "../diamond/IDiamondLoupe.sol";

import "@openzeppelin/contracts/utils/Multicall.sol";

import "./DiamondStorage.sol";

contract Diamond is Multicall {
    using ERC165Storage for ERC165Storage.Layout;
    using OwnableStorage for OwnableStorage.Layout;

    struct Initialization {
        address initContract;
        bytes initData;
    }

    struct CoreFacets {
        address diamondCutFacet;
        address diamondLoupeFacet;
        address erc165Facet;
        address erc173Facet;
    }

    constructor(
        address owner,
        CoreFacets memory _coreFacets,
        IDiamondCut.FacetCut[] memory _facets,
        Initialization[] memory _initializations
    ) {
        ERC165Storage.Layout storage erc165 = ERC165Storage.layout();

        // register DiamondCut

        bytes4[] memory selectorsDiamondCut = new bytes4[](1);
        selectorsDiamondCut[0] = IDiamondCut.diamondCut.selector;

        erc165.setSupportedInterface(type(IDiamondCut).interfaceId, true);

        // register DiamondLoupe

        bytes4[] memory selectorsDiamondLoupe = new bytes4[](4);
        selectorsDiamondLoupe[0] = IDiamondLoupe.facets.selector;
        selectorsDiamondLoupe[1] = IDiamondLoupe.facetFunctionSelectors.selector;
        selectorsDiamondLoupe[2] = IDiamondLoupe.facetAddresses.selector;
        selectorsDiamondLoupe[3] = IDiamondLoupe.facetAddress.selector;

        erc165.setSupportedInterface(type(IDiamondLoupe).interfaceId, true);

        // register ERC165 (supportsInterface)

        bytes4[] memory selectorsERC165 = new bytes4[](1);
        selectorsERC165[0] = IERC165.supportsInterface.selector;

        erc165.setSupportedInterface(type(IERC165).interfaceId, true);

        // register ERC173 (Ownable)

        bytes4[] memory selectorsERC173 = new bytes4[](2);
        selectorsERC173[0] = IERC173.owner.selector;
        selectorsERC173[1] = IERC173.transferOwnership.selector;

        erc165.setSupportedInterface(type(IERC173).interfaceId, true);

        // execute the first ever diamond cut,
        // we are calling the addFunctions directly to save ~ %50 gas

        DiamondStorage.addFunctions(_coreFacets.diamondCutFacet, selectorsDiamondCut);
        DiamondStorage.addFunctions(_coreFacets.diamondLoupeFacet, selectorsDiamondLoupe);
        DiamondStorage.addFunctions(_coreFacets.erc165Facet, selectorsERC165);
        DiamondStorage.addFunctions(_coreFacets.erc173Facet, selectorsERC173);

        // set owner

        OwnableStorage.layout().setOwner(owner);

        // initialization

        for (uint256 i = 0; i < _facets.length; i++) {
            DiamondStorage.addFunctions(_facets[i].facetAddress, _facets[i].functionSelectors);
        }

        for (uint256 i = 0; i < _initializations.length; i++) {
            DiamondStorage.initializeDiamondCut(_initializations[i].initContract, _initializations[i].initData);
        }
    }

    // Find facet for function that is called and execute the
    // function if a facet is found and return any value.
    fallback() external payable {
        DiamondStorage.Layout storage l;
        bytes32 position = DiamondStorage.DIAMOND_STORAGE_POSITION;
        // get diamond storage
        assembly {
            l.slot := position
        }

        // get facet from function selector
        address facet = l.selectorToFacetAndPosition[msg.sig].facetAddress;
        require(facet != address(0), "BAD_FUNC");

        // Execute external function from facet using delegatecall and return any value.
        assembly {
            // copy function selector and any arguments
            calldatacopy(0, 0, calldatasize())
            // execute function call using the facet
            let result := delegatecall(gas(), facet, 0, calldatasize(), 0, 0)
            // get any return value
            returndatacopy(0, 0, returndatasize())
            // return any return value or error back to the caller
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Multicall.sol)

pragma solidity ^0.8.0;

import "./Address.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
abstract contract Multicall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     */
    function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = Address.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "./IERC173Events.sol";

/**
 * @title Contract ownership standard interface
 * @dev see https://eips.ethereum.org/EIPS/eip-173
 */
interface IERC173 is IERC173Events {
    /**
     * @notice get the ERC173 contract owner
     * @return conrtact owner
     */
    function owner() external view returns (address);

    /**
     * @notice transfer contract ownership to new account
     * @param account address of new owner
     */
    function transferOwnership(address account) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

/**
 * @title Contract ownership standard interface (event only)
 * @dev see https://eips.ethereum.org/EIPS/eip-173
 */
interface IERC173Events {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

library OwnableStorage {
    struct Layout {
        address owner;
    }

    bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.Ownable");

    function layout() internal pure returns (Layout storage l) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            l.slot := slot
        }
    }

    function setOwner(Layout storage l, address owner) internal {
        l.owner = owner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

import "../diamond/IDiamondCut.sol";

// Remember to add the loupe functions from DiamondLoupeFacet to the diamond.
// The loupe functions are required by the EIP2535 Diamonds standard

error ErrDiamondFacetAlreadyExists(address facet, bytes4 selector);
error ErrDiamondFacetSameFunction(address facet, bytes4 selector);

library DiamondStorage {
    bytes32 constant DIAMOND_STORAGE_POSITION = keccak256("diamond.standard.diamond.storage");

    struct FacetAddressAndPosition {
        address facetAddress;
        uint96 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
    }

    struct FacetFunctionSelectors {
        bytes4[] functionSelectors;
        uint256 facetAddressPosition; // position of facetAddress in facetAddresses array
    }

    struct Layout {
        // maps function selector to the facet address and
        // the position of the selector in the facetFunctionSelectors.selectors array
        mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
        // maps facet addresses to function selectors
        mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
        // facet addresses
        address[] facetAddresses;
    }

    function layout() internal pure returns (Layout storage l) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            l.slot := position
        }
    }

    event DiamondCut(IDiamondCut.FacetCut[] _diamondCut, address _init, bytes _calldata);

    // Internal function version of diamondCut
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        for (uint256 facetIndex; facetIndex < _diamondCut.length; facetIndex++) {
            IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
            if (action == IDiamondCut.FacetCutAction.Add) {
                addFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Replace) {
                replaceFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Remove) {
                removeFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else {
                revert("LibDiamondCut: Incorrect FacetCutAction");
            }
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        // require(
        //     _functionSelectors.length > 0,
        //     "LibDiamondCut: No selectors in facet to cut"
        // );
        Layout storage l = layout();
        // require(
        //     _facetAddress != address(0),
        //     "LibDiamondCut: Add facet can't be address(0)"
        // );
        uint96 selectorPosition = uint96(l.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(l, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;

            if (oldFacetAddress != address(0)) {
                revert ErrDiamondFacetAlreadyExists(oldFacetAddress, selector);
            }

            addFunction(l, selector, selectorPosition, _facetAddress);
            selectorPosition++;
        }
    }

    function replaceFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        // require(
        //     _functionSelectors.length > 0,
        //     "LibDiamondCut: No selectors in facet to cut"
        // );
        Layout storage l = layout();
        // require(
        //     _facetAddress != address(0),
        //     "LibDiamondCut: Add facet can't be address(0)"
        // );
        uint96 selectorPosition = uint96(l.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(l, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;

            if (oldFacetAddress == _facetAddress) {
                revert ErrDiamondFacetSameFunction(oldFacetAddress, selector);
            }

            removeFunction(l, oldFacetAddress, selector);
            addFunction(l, selector, selectorPosition, _facetAddress);
            selectorPosition++;
        }
    }

    function removeFunctions(address, bytes4[] memory _functionSelectors) internal {
        // require(
        //     _functionSelectors.length > 0,
        //     "LibDiamondCut: No selectors in facet to cut"
        // );
        Layout storage l = layout();
        // if function does not exist then do nothing and return
        // require(
        //     _facetAddress == address(0),
        //     "LibDiamondCut: Remove facet address must be address(0)"
        // );
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = l.selectorToFacetAndPosition[selector].facetAddress;
            removeFunction(l, oldFacetAddress, selector);
        }
    }

    function addFacet(Layout storage l, address _facetAddress) internal {
        enforceHasContractCode(_facetAddress, "LibDiamondCut: New facet has no code");
        l.facetFunctionSelectors[_facetAddress].facetAddressPosition = l.facetAddresses.length;
        l.facetAddresses.push(_facetAddress);
    }

    function addFunction(
        Layout storage l,
        bytes4 _selector,
        uint96 _selectorPosition,
        address _facetAddress
    ) internal {
        l.selectorToFacetAndPosition[_selector].functionSelectorPosition = _selectorPosition;
        l.facetFunctionSelectors[_facetAddress].functionSelectors.push(_selector);
        l.selectorToFacetAndPosition[_selector].facetAddress = _facetAddress;
    }

    function removeFunction(
        Layout storage l,
        address _facetAddress,
        bytes4 _selector
    ) internal {
        // require(
        //     _facetAddress != address(0),
        //     "LibDiamondCut: Can't remove function that doesn't exist"
        // );
        // an immutable function is a function defined directly in a diamond
        // require(
        //     _facetAddress != address(this),
        //     "LibDiamondCut: Can't remove immutable function"
        // );
        // replace selector with last selector, then delete last selector
        uint256 selectorPosition = l.selectorToFacetAndPosition[_selector].functionSelectorPosition;
        uint256 lastSelectorPosition = l.facetFunctionSelectors[_facetAddress].functionSelectors.length - 1;
        // if not the same then replace _selector with lastSelector
        if (selectorPosition != lastSelectorPosition) {
            bytes4 lastSelector = l.facetFunctionSelectors[_facetAddress].functionSelectors[lastSelectorPosition];
            l.facetFunctionSelectors[_facetAddress].functionSelectors[selectorPosition] = lastSelector;
            l.selectorToFacetAndPosition[lastSelector].functionSelectorPosition = uint96(selectorPosition);
        }
        // delete the last selector
        l.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
        delete l.selectorToFacetAndPosition[_selector];

        // if no more selectors for facet address then delete the facet address
        if (lastSelectorPosition == 0) {
            // replace facet address with last facet address and delete last facet address
            uint256 lastFacetAddressPosition = l.facetAddresses.length - 1;
            uint256 facetAddressPosition = l.facetFunctionSelectors[_facetAddress].facetAddressPosition;
            if (facetAddressPosition != lastFacetAddressPosition) {
                address lastFacetAddress = l.facetAddresses[lastFacetAddressPosition];
                l.facetAddresses[facetAddressPosition] = lastFacetAddress;
                l.facetFunctionSelectors[lastFacetAddress].facetAddressPosition = facetAddressPosition;
            }
            l.facetAddresses.pop();
            delete l.facetFunctionSelectors[_facetAddress].facetAddressPosition;
        }
    }

    function initializeDiamondCut(address _init, bytes memory _calldata) internal {
        if (_init == address(0)) {
            require(_calldata.length == 0, "LibDiamondCut: _init is address(0) but_calldata is not empty");
        } else {
            require(_calldata.length > 0, "LibDiamondCut: _calldata is empty but _init is not address(0)");
            if (_init != address(this)) {
                enforceHasContractCode(_init, "LibDiamondCut: _init address has no code");
            }
            (bool success, bytes memory error) = _init.delegatecall(_calldata);
            if (!success) {
                if (error.length > 0) {
                    // bubble up the error
                    revert(string(error));
                } else {
                    revert("LibDiamondCut: _init function reverted");
                }
            }
        }
    }

    function enforceHasContractCode(address _contract, string memory _errorMessage) internal view {
        uint256 contractSize;
        assembly {
            contractSize := extcodesize(_contract)
        }
        require(contractSize > 0, _errorMessage);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

interface IDiamondCut {
    enum FacetCutAction {
        Add,
        Replace,
        Remove
    }
    // Add=0, Replace=1, Remove=2

    struct FacetCut {
        address facetAddress;
        FacetCutAction action;
        bytes4[] functionSelectors;
    }

    /// @notice Add/replace/remove any number of functions and optionally execute
    ///         a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments
    ///                  _calldata is executed with delegatecall on _init
    function diamondCut(
        FacetCut[] calldata _diamondCut,
        address _init,
        bytes calldata _calldata
    ) external;

    event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

/******************************************************************************\
* Author: Nick Mudge <[email protected]> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/

// A loupe is a small magnifying glass used to look at diamonds.
// These functions look at diamonds
interface IDiamondLoupe {
    /// These functions are expected to be called frequently
    /// by tools.

    struct Facet {
        address facetAddress;
        bytes4[] functionSelectors;
    }

    /// @notice Gets all facet addresses and their four byte function selectors.
    /// @return facets_ Facet
    function facets() external view returns (Facet[] memory facets_);

    /// @notice Gets all the function selectors supported by a specific facet.
    /// @param _facet The facet address.
    /// @return facetFunctionSelectors_
    function facetFunctionSelectors(address _facet) external view returns (bytes4[] memory facetFunctionSelectors_);

    /// @notice Get all the facet addresses used by a diamond.
    /// @return facetAddresses_
    function facetAddresses() external view returns (address[] memory facetAddresses_);

    /// @notice Gets the facet that supports the given selector.
    /// @dev If facet is not found return address(0).
    /// @param _functionSelector The function selector.
    /// @return facetAddress_ The facet address.
    function facetAddress(bytes4 _functionSelector) external view returns (address facetAddress_);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

import "./ERC165Storage.sol";

/**
 * @title ERC165
 * @notice Standard EIP-165 facet which would be already included as a core facet in Flair's Diamond contract.
 *
 * @custom:type eip-2535-facet
 * @custom:category Introspection
 * @custom:provides-interfaces IERC165
 */
contract ERC165 is IERC165 {
    using ERC165Storage for ERC165Storage.Layout;

    /**
     * @inheritdoc IERC165
     */
    function supportsInterface(bytes4 interfaceId) public view returns (bool) {
        return ERC165Storage.layout().isSupportedInterface(interfaceId);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

library ERC165Storage {
    struct Layout {
        mapping(bytes4 => bool) supportedInterfaces;
    }

    bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.ERC165");

    function layout() internal pure returns (Layout storage l) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            l.slot := slot
        }
    }

    function isSupportedInterface(Layout storage l, bytes4 interfaceId) internal view returns (bool) {
        return l.supportedInterfaces[interfaceId];
    }

    function setSupportedInterface(
        Layout storage l,
        bytes4 interfaceId,
        bool status
    ) internal {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        l.supportedInterfaces[interfaceId] = status;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import "./ERC2771ContextStorage.sol";
import "./ERC2771ContextInternal.sol";
import "./IERC2771Context.sol";

/**
 * @title ERC2771 Context
 * @notice Provides view functions about configured trusted forwarder according to EIP-2771.
 *
 * @custom:type eip-2535-facet
 * @custom:category Meta Transactions
 * @custom:provides-interfaces IERC2771Context
 */
contract ERC2771Context is IERC2771Context, ERC2771ContextInternal {
    using ERC2771ContextStorage for ERC2771ContextStorage.Layout;

    function trustedForwarder() external view override returns (address) {
        return ERC2771ContextStorage.layout().trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return _isTrustedForwarder(forwarder);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

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

import "./ERC2771ContextStorage.sol";

abstract contract ERC2771ContextInternal is Context {
    function _isTrustedForwarder(address operator) internal view returns (bool) {
        return ERC2771ContextStorage.layout().trustedForwarder == operator;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (_isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (_isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

library ERC2771ContextStorage {
    struct Layout {
        address trustedForwarder;
    }

    bytes32 internal constant STORAGE_SLOT = keccak256("openzeppelin.contracts.storage.ERC2771Context");

    function layout() internal pure returns (Layout storage l) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            l.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

interface IERC2771Context {
    function trustedForwarder() external view returns (address);

    function isTrustedForwarder(address forwarder) external view returns (bool);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1337
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"components":[{"internalType":"address","name":"diamondCutFacet","type":"address"},{"internalType":"address","name":"diamondLoupeFacet","type":"address"},{"internalType":"address","name":"erc165Facet","type":"address"},{"internalType":"address","name":"erc173Facet","type":"address"}],"internalType":"struct Diamond.CoreFacets","name":"_coreFacets","type":"tuple"},{"components":[{"internalType":"address","name":"facetAddress","type":"address"},{"internalType":"enum IDiamondCut.FacetCutAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"internalType":"struct IDiamondCut.FacetCut[]","name":"_facets","type":"tuple[]"},{"components":[{"internalType":"address","name":"initContract","type":"address"},{"internalType":"bytes","name":"initData","type":"bytes"}],"internalType":"struct Diamond.Initialization[]","name":"_initializations","type":"tuple[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"facet","type":"address"},{"internalType":"bytes4","name":"selector","type":"bytes4"}],"name":"ErrDiamondFacetAlreadyExists","type":"error"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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