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

import "../ResolverBase.sol";
import "./IContentHashResolver.sol";

abstract contract ContentHashResolver is IContentHashResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => bytes)) versionable_hashes;

    /// Sets the contenthash associated with an ENS node.
    /// May only be called by the owner of that node in the ENS registry.
    /// @param node The node to update.
    /// @param hash The contenthash to set
    function setContenthash(
        bytes32 node,
        bytes calldata hash
    ) external virtual authorised(node) {
        versionable_hashes[recordVersions[node]][node] = hash;
        emit ContenthashChanged(node, hash);
    }

    /// Returns the contenthash associated with an ENS node.
    /// @param node The ENS node to query.
    /// @return The associated contenthash.
    function contenthash(
        bytes32 node
    ) external view virtual override returns (bytes memory) {
        return versionable_hashes[recordVersions[node]][node];
    }

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