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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import { LibDiamond } from "./libraries/LibDiamond.sol";
import { IDiamondCut } from "./interfaces/IDiamondCut.sol";

contract Diamond {
  constructor(address _contractOwner, address _diamondCutFacet) payable {
    LibDiamond.setContractOwner(_contractOwner);

    // Add the diamondCut external function from the diamondCutFacet
    IDiamondCut.FacetCut[] memory cut = new IDiamondCut.FacetCut[](1);
    bytes4[] memory functionSelectors = new bytes4[](1);
    functionSelectors[0] = IDiamondCut.diamondCut.selector;
    cut[0] = IDiamondCut.FacetCut({
      facetAddress: _diamondCutFacet,
      action: IDiamondCut.FacetCutAction.Add,
      functionSelectors: functionSelectors
    });
    LibDiamond.diamondCut(cut, address(0), "");
  }

  // 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 = ds.facetAddressAndSelectorPosition[msg.sig].facetAddress;
    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 {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

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 ^0.8.4;

import { IDiamondCut } from "../interfaces/IDiamondCut.sol";

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

  struct FacetAddressAndSelectorPosition {
    address facetAddress;
    uint16 selectorPosition;
  }

  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 => FacetAddressAndSelectorPosition) facetAddressAndSelectorPosition;
    bytes4[] selectors;
    mapping(bytes4 => bool) supportedInterfaces;
    // owner of the contract
    address contractOwner;
  }

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

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

  function setContractOwner(address _newOwner) internal {
    DiamondStorage storage ds = diamondStorage();
    address previousOwner = ds.contractOwner;
    ds.contractOwner = _newOwner;
    emit OwnershipTransferred(previousOwner, _newOwner);
  }

  function contractOwner() internal view returns (address contractOwner_) {
    contractOwner_ = diamondStorage().contractOwner;
  }

  function enforceIsContractOwner() internal view {
    require(msg.sender == diamondStorage().contractOwner, "LibDiamond: Must be contract owner");
  }

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

  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("LibDiamond: Incorrect FacetCutAction");
      }
    }
    emit DiamondCut(_diamondCut, _init, _calldata);
    initializeDiamondCut(_init, _calldata);
  }

  function addFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
    require(_functionSelectors.length > 0, "LibDiamond: No selectors in facet to cut");
    DiamondStorage storage ds = diamondStorage();
    require(_facetAddress != address(0), "LibDiamond: Add facet can't be address(0)");
    enforceHasContractCode(_facetAddress, "LibDiamond: Add facet has no code");
    for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
      bytes4 selector = _functionSelectors[selectorIndex];
      address oldFacetAddress = ds.facetAddressAndSelectorPosition[selector].facetAddress;
      require(oldFacetAddress == address(0), "LibDiamond: Can't add function that already exists");
      ds.facetAddressAndSelectorPosition[selector] = FacetAddressAndSelectorPosition(
        _facetAddress,
        uint16(ds.selectors.length)
      );
      ds.selectors.push(selector);
    }
  }

  function replaceFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
    require(_functionSelectors.length > 0, "LibDiamond: No selectors in facet to cut");
    DiamondStorage storage ds = diamondStorage();
    require(_facetAddress != address(0), "LibDiamond: Replace facet can't be address(0)");
    enforceHasContractCode(_facetAddress, "LibDiamond: Replace facet has no code");
    for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
      bytes4 selector = _functionSelectors[selectorIndex];
      address oldFacetAddress = ds.facetAddressAndSelectorPosition[selector].facetAddress;
      require(
        oldFacetAddress != _facetAddress,
        "LibDiamond: Can't replace function with same function"
      );
      require(
        oldFacetAddress != address(0),
        "LibDiamond: Can't replace function that doesn't exist"
      );
      ds.facetAddressAndSelectorPosition[selector].facetAddress = _facetAddress;
    }
  }

  function removeFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
    require(_functionSelectors.length > 0, "LibDiamond: No selectors in facet to cut");
    DiamondStorage storage ds = diamondStorage();
    require(_facetAddress == address(0), "LibDiamond: Remove facet address must be address(0)");
    for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
      bytes4 selector = _functionSelectors[selectorIndex];
      FacetAddressAndSelectorPosition memory oldFacetAddressAndSelectorPosition = ds
        .facetAddressAndSelectorPosition[selector];
      require(
        oldFacetAddressAndSelectorPosition.facetAddress != address(0),
        "LibDiamond: Can't remove function that doesn't exist"
      );
      // replace selector with last selector
      uint256 selectorPosition = oldFacetAddressAndSelectorPosition.selectorPosition;
      uint256 lastSelectorPosition = ds.selectors.length - 1;
      if (selectorPosition != lastSelectorPosition) {
        bytes4 lastSelector = ds.selectors[lastSelectorPosition];
        ds.selectors[selectorPosition] = lastSelector;
        ds.facetAddressAndSelectorPosition[lastSelector].selectorPosition = uint16(
          selectorPosition
        );
      }
      ds.selectors.pop();
      delete ds.facetAddressAndSelectorPosition[selector];
    }
  }

  function initializeDiamondCut(address _init, bytes memory _calldata) internal {
    if (_init == address(0)) {
      require(_calldata.length == 0, "LibDiamond: _init is address(0) but_calldata is not empty");
    } else {
      require(_calldata.length > 0, "LibDiamond: _calldata is empty but _init is not address(0)");
      if (_init != address(this)) {
        enforceHasContractCode(_init, "LibDiamond: _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("LibDiamond: _init function reverted");
        }
      }
    }
  }

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

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "viaIR": true,
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_contractOwner","type":"address"},{"internalType":"address","name":"_diamondCutFacet","type":"address"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"components":[{"internalType":"address","name":"facetAddress","type":"address"},{"internalType":"enum IDiamondCut.FacetCutAction","name":"action","type":"uint8"},{"internalType":"bytes4[]","name":"functionSelectors","type":"bytes4[]"}],"indexed":false,"internalType":"struct IDiamondCut.FacetCut[]","name":"_diamondCut","type":"tuple[]"},{"indexed":false,"internalType":"address","name":"_init","type":"address"},{"indexed":false,"internalType":"bytes","name":"_calldata","type":"bytes"}],"name":"DiamondCut","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"stateMutability":"payable","type":"fallback"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000842bc448be0b6846d9bfc90b91be22630ed545f00000000000000000000000001c05b43cf3121584127b29cda3ba5be7992de62d

-----Decoded View---------------
Arg [0] : _contractOwner (address): 0x842Bc448bE0B6846D9bFC90b91Be22630eD545F0
Arg [1] : _diamondCutFacet (address): 0x1c05B43cf3121584127B29cdA3BA5BE7992De62d

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000842bc448be0b6846d9bfc90b91be22630ed545f0
Arg [1] : 0000000000000000000000001c05b43cf3121584127b29cda3ba5be7992de62d