// File: contracts/Diamond.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
*
* Implementation of a diamond.
/******************************************************************************/

import "./libraries/LibDiamond.sol";
import "./interfaces/IDiamondCut.sol";
import "./interfaces/IDiamondLoupe.sol";

contract Diamond {

    constructor(IDiamondCut.FacetCut[] memory _diamondCut, address _init, bytes memory _calldata) payable {
        LibDiamond.diamondCut(_diamondCut, _init, _calldata);
    }

    // Find facet for function that is called and execute the
    // function if a facet is found and return any value.
    fallback() external payable {
        LibDiamond.DiamondStorage storage ds;
        bytes32 position = LibDiamond.DIAMOND_STORAGE_POSITION;
        // get diamond storage
        assembly {
            ds.slot := position
        }
        // get facet from function selector
        address facet = address(bytes20(ds.facets[msg.sig]));
        require(facet != address(0), "Diamond: Function does not exist");
        // 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 {}
}

// File: contracts/libraries/LibDiamond.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
* EIP-2535 Diamonds: https://eips.ethereum.org/EIPS/eip-2535
/******************************************************************************/
import { IDiamondCut } from "../interfaces/IDiamondCut.sol";

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

    struct DiamondStorage {
        // maps function selectors to the facets that execute the functions.
        // and maps the selectors to their position in the selectorSlots array.
        // func selector => address facet, selector position
        mapping(bytes4 => bytes32) facets;
        // array of slots of function selectors.
        // each slot holds 8 function selectors.
        mapping(uint256 => bytes32) selectorSlots;
        // The number of function selectors in selectorSlots
        uint16 selectorCount;
    }

    function diamondStorage() internal pure returns (DiamondStorage storage ds) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

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

    bytes32 constant CLEAR_ADDRESS_MASK = bytes32(uint256(0xffffffffffffffffffffffff));
    bytes32 constant CLEAR_SELECTOR_MASK = bytes32(uint256(0xffffffff << 224));

    // Internal function version of diamondCut
    // This code is almost the same as the external diamondCut,
    // except it is using 'Facet[] memory _diamondCut' instead of
    // 'Facet[] calldata _diamondCut'.
    // The code is duplicated to prevent copying calldata to memory which
    // causes an error for a two dimensional array.
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        DiamondStorage storage ds = diamondStorage();
        uint256 originalSelectorCount = ds.selectorCount;
        uint256 selectorCount = originalSelectorCount;
        bytes32 selectorSlot;
        // Check if last selector slot is not full
        // "selectorCount & 7" is a gas efficient modulo by eight "selectorCount % 8"
        if (selectorCount & 7 > 0) {
            // get last selectorSlot
            // "selectorSlot >> 3" is a gas efficient division by 8 "selectorSlot / 8"
            selectorSlot = ds.selectorSlots[selectorCount >> 3];
        }
        // loop through diamond cut
        for (uint256 facetIndex = 0; facetIndex < _diamondCut.length;) {
            (selectorCount, selectorSlot) = addReplaceRemoveFacetSelectors(
                selectorCount,
                selectorSlot,
                _diamondCut[facetIndex].facetAddress,
                _diamondCut[facetIndex].action,
                _diamondCut[facetIndex].functionSelectors
            );
            unchecked { facetIndex += 1; }
        }
        if (selectorCount != originalSelectorCount) {
            ds.selectorCount = uint16(selectorCount);
        }
        // If last selector slot is not full
        // "selectorCount & 7" is a gas efficient modulo by eight "selectorCount % 8"
        if (selectorCount & 7 > 0) {
            // "selectorSlot >> 3" is a gas efficient division by 8 "selectorSlot / 8"
            ds.selectorSlots[selectorCount >> 3] = selectorSlot;
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addReplaceRemoveFacetSelectors(
        uint256 _selectorCount,
        bytes32 _selectorSlot,
        address _newFacetAddress,
        IDiamondCut.FacetCutAction _action,
        bytes4[] memory _selectors
    ) internal returns (uint256, bytes32) {
        DiamondStorage storage ds = diamondStorage();
        require(_selectors.length > 0, "LibDiamondCut: No selectors in facet to cut");
        if (_action == IDiamondCut.FacetCutAction.Add) {
            enforceHasContractCode(_newFacetAddress, "LibDiamondCut: Add facet has no code");
            for (uint256 selectorIndex = 0; selectorIndex < _selectors.length;) {
                bytes4 selector = _selectors[selectorIndex];
                bytes32 oldFacet = ds.facets[selector];
                require(address(bytes20(oldFacet)) == address(0), "LibDiamondCut: Can't add function that already exists");
                // add facet for selector
                ds.facets[selector] = bytes20(_newFacetAddress) | bytes32(_selectorCount);
                // "_selectorCount & 7" is a gas efficient modulo by eight "_selectorCount % 8"
                uint256 selectorInSlotPosition = (_selectorCount & 7) << 5;
                // clear selector position in slot and add selector
                _selectorSlot = (_selectorSlot & ~(CLEAR_SELECTOR_MASK >> selectorInSlotPosition)) | (bytes32(selector) >> selectorInSlotPosition);
                // if slot is full then write it to storage
                if (selectorInSlotPosition == 224) {
                    // "_selectorSlot >> 3" is a gas efficient division by 8 "_selectorSlot / 8"
                    ds.selectorSlots[_selectorCount >> 3] = _selectorSlot;
                    _selectorSlot = 0;
                }
                _selectorCount++;
                unchecked { selectorIndex += 1; }
            }
        } else if (_action == IDiamondCut.FacetCutAction.Replace) {
            enforceHasContractCode(_newFacetAddress, "LibDiamondCut: Replace facet has no code");
            for (uint256 selectorIndex = 0; selectorIndex < _selectors.length;) {
                bytes4 selector = _selectors[selectorIndex];
                bytes32 oldFacet = ds.facets[selector];
                address oldFacetAddress = address(bytes20(oldFacet));
                // only useful if immutable functions exist
                require(oldFacetAddress != address(this), "LibDiamondCut: Can't replace immutable function");
                require(oldFacetAddress != _newFacetAddress, "LibDiamondCut: Can't replace function with same function");
                require(oldFacetAddress != address(0), "LibDiamondCut: Can't replace function that doesn't exist");
                // replace old facet address
                ds.facets[selector] = (oldFacet & CLEAR_ADDRESS_MASK) | bytes20(_newFacetAddress);
                unchecked { selectorIndex += 1; }
            }
        } else if (_action == IDiamondCut.FacetCutAction.Remove) {
            require(_newFacetAddress == address(0), "LibDiamondCut: Remove facet address must be address(0)");
            // "_selectorCount >> 3" is a gas efficient division by 8 "_selectorCount / 8"
            uint256 selectorSlotCount = _selectorCount >> 3;
            // "_selectorCount & 7" is a gas efficient modulo by eight "_selectorCount % 8"
            uint256 selectorInSlotIndex = _selectorCount & 7;
            for (uint256 selectorIndex = 0; selectorIndex < _selectors.length;) {
                if (_selectorSlot == 0) {
                    // get last selectorSlot
                    selectorSlotCount--;
                    _selectorSlot = ds.selectorSlots[selectorSlotCount];
                    selectorInSlotIndex = 7;
                } else {
                    selectorInSlotIndex--;
                }
                bytes4 lastSelector;
                uint256 oldSelectorsSlotCount;
                uint256 oldSelectorInSlotPosition;
                // adding a block here prevents stack too deep error
                {
                    bytes4 selector = _selectors[selectorIndex];
                    bytes32 oldFacet = ds.facets[selector];
                    require(address(bytes20(oldFacet)) != address(0), "LibDiamondCut: Can't remove function that doesn't exist");
                    // only useful if immutable functions exist
                    require(address(bytes20(oldFacet)) != address(this), "LibDiamondCut: Can't remove immutable function");
                    // replace selector with last selector in ds.facets
                    // gets the last selector
                    lastSelector = bytes4(_selectorSlot << (selectorInSlotIndex << 5));
                    if (lastSelector != selector) {
                        // update last selector slot position info
                        ds.facets[lastSelector] = (oldFacet & CLEAR_ADDRESS_MASK) | bytes20(ds.facets[lastSelector]);
                    }
                    delete ds.facets[selector];
                    uint256 oldSelectorCount = uint16(uint256(oldFacet));
                    // "oldSelectorCount >> 3" is a gas efficient division by 8 "oldSelectorCount / 8"
                    oldSelectorsSlotCount = oldSelectorCount >> 3;
                    // "oldSelectorCount & 7" is a gas efficient modulo by eight "oldSelectorCount % 8"
                    oldSelectorInSlotPosition = (oldSelectorCount & 7) << 5;
                }
                if (oldSelectorsSlotCount != selectorSlotCount) {
                    bytes32 oldSelectorSlot = ds.selectorSlots[oldSelectorsSlotCount];
                    // clears the selector we are deleting and puts the last selector in its place.
                    oldSelectorSlot =
                        (oldSelectorSlot & ~(CLEAR_SELECTOR_MASK >> oldSelectorInSlotPosition)) |
                        (bytes32(lastSelector) >> oldSelectorInSlotPosition);
                    // update storage with the modified slot
                    ds.selectorSlots[oldSelectorsSlotCount] = oldSelectorSlot;
                } else {
                    // clears the selector we are deleting and puts the last selector in its place.
                    _selectorSlot =
                        (_selectorSlot & ~(CLEAR_SELECTOR_MASK >> oldSelectorInSlotPosition)) |
                        (bytes32(lastSelector) >> oldSelectorInSlotPosition);
                }
                if (selectorInSlotIndex == 0) {
                    delete ds.selectorSlots[selectorSlotCount];
                    _selectorSlot = 0;
                }
                unchecked { selectorIndex += 1; }
            }
            _selectorCount = selectorSlotCount * 8 + selectorInSlotIndex;
        } else {
            revert("LibDiamondCut: Incorrect FacetCutAction");
        }
        return (_selectorCount, _selectorSlot);
    }

    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);
    }
}

// File: contracts/interfaces/IDiamondCut.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (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;
    }

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

// File: contracts/interfaces/IDiamondLoupe.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

/******************************************************************************\
* Author: Nick Mudge <nick@perfectabstractions.com> (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_);
}