// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

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

// libraries

// contracts
import {Facet} from "@towns-protocol/diamond/src/facets/Facet.sol";
import {OwnableBase} from "@towns-protocol/diamond/src/facets/ownable/OwnableBase.sol";

contract MetadataFacet is IMetadata, OwnableBase, Facet {
    function __MetadataFacet_init(
        bytes32 _contractType,
        string memory _contractURI
    ) external onlyInitializing {
        __MetadataFacet_init_unchained(_contractType, _contractURI);
    }

    function __MetadataFacet_init_unchained(
        bytes32 _contractType,
        string memory _contractURI
    ) internal {
        _addInterface(type(IMetadata).interfaceId);

        MetadataStorage.Layout storage ds = MetadataStorage.layout();
        ds.contractType = _contractType;
        ds.contractURI = _contractURI;
    }

    function contractType() external view returns (bytes32) {
        return MetadataStorage.layout().contractType;
    }

    function contractVersion() external view virtual returns (uint32) {
        return _getInitializedVersion();
    }

    function contractURI() external view returns (string memory) {
        return MetadataStorage.layout().contractURI;
    }

    function setContractURI(string calldata uri) external onlyOwner {
        MetadataStorage.layout().contractURI = uri;
        emit ContractURIChanged(uri);
    }
}

// =============================================================
//                           Storage
// =============================================================

library MetadataStorage {
    struct Layout {
        bytes32 contractType;
        string contractURI;
    }

    // keccak256(abi.encode(uint256(keccak256("diamond.facets.metadata.storage")) - 1)) &
    // ~bytes32(uint256(0xff))
    bytes32 internal constant STORAGE_SLOT =
        0xf5e7800d151c04390bdf7c63536bd6072359c9f89940782fbad33a288db56300;

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