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

import "../ResolverBase.sol";
import "./IPubkeyResolver.sol";

abstract contract PubkeyResolver is IPubkeyResolver, ResolverBase {
    struct PublicKey {
        bytes32 x;
        bytes32 y;
    }

    mapping(uint64 => mapping(bytes32 => PublicKey)) versionable_pubkeys;

    /// Sets the SECP256k1 public key associated with an ENS node.
    /// @param node The ENS node to query
    /// @param x the X coordinate of the curve point for the public key.
    /// @param y the Y coordinate of the curve point for the public key.
    function setPubkey(
        bytes32 node,
        bytes32 x,
        bytes32 y
    ) external virtual authorised(node) {
        versionable_pubkeys[recordVersions[node]][node] = PublicKey(x, y);
        emit PubkeyChanged(node, x, y);
    }

    /// Returns the SECP256k1 public key associated with an ENS node.
    /// Defined in EIP 619.
    /// @param node The ENS node to query
    /// @return x The X coordinate of the curve point for the public key.
    /// @return y The Y coordinate of the curve point for the public key.
    function pubkey(
        bytes32 node
    ) external view virtual override returns (bytes32 x, bytes32 y) {
        uint64 currentRecordVersion = recordVersions[node];
        return (
            versionable_pubkeys[currentRecordVersion][node].x,
            versionable_pubkeys[currentRecordVersion][node].y
        );
    }

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