// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

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

abstract contract InterfaceResolver is IInterfaceResolver, AddrResolver {
    mapping(uint64 => mapping(bytes32 => mapping(bytes4 => address))) versionable_interfaces;

    /// Sets an interface associated with a name.
    /// Setting the address to 0 restores the default behaviour of querying the contract at `addr()` for interface support.
    /// @param node The node to update.
    /// @param interfaceID The EIP 165 interface ID.
    /// @param implementer The address of a contract that implements this interface for this node.
    function setInterface(
        bytes32 node,
        bytes4 interfaceID,
        address implementer
    ) external virtual authorised(node) {
        versionable_interfaces[recordVersions[node]][node][
            interfaceID
        ] = implementer;
        emit InterfaceChanged(node, interfaceID, implementer);
    }

    /// Returns the address of a contract that implements the specified interface for this name.
    /// If an implementer has not been set for this interfaceID and name, the resolver will query
    /// the contract at `addr()`. If `addr()` is set, a contract exists at that address, and that
    /// contract implements EIP165 and returns `true` for the specified interfaceID, its address
    /// will be returned.
    /// @param node The ENS node to query.
    /// @param interfaceID The EIP 165 interface ID to check for.
    /// @return The address that implements this interface, or 0 if the interface is unsupported.
    function interfaceImplementer(
        bytes32 node,
        bytes4 interfaceID
    ) external view virtual override returns (address) {
        address implementer = versionable_interfaces[recordVersions[node]][
            node
        ][interfaceID];
        if (implementer != address(0)) {
            return implementer;
        }

        address a = addr(node);
        if (a == address(0)) {
            return address(0);
        }

        (bool success, bytes memory returnData) = a.staticcall(
            abi.encodeWithSignature(
                "supportsInterface(bytes4)",
                type(IERC165).interfaceId
            )
        );
        if (!success || returnData.length < 32 || returnData[31] == 0) {
            // EIP 165 not supported by target
            return address(0);
        }

        (success, returnData) = a.staticcall(
            abi.encodeWithSignature("supportsInterface(bytes4)", interfaceID)
        );
        if (!success || returnData.length < 32 || returnData[31] == 0) {
            // Specified interface not supported by target
            return address(0);
        }

        return a;
    }

    function supportsInterface(
        bytes4 interfaceID
    ) public view virtual override returns (bool) {
        return
            interfaceID == type(IInterfaceResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}