import '../../../../api/marianumcloud/talk/chat/get_chat_response.dart';
import '../../../../api/marianumcloud/talk/chat/rich_object_string_processor.dart';
import '../../../../api/marianumcloud/talk/room/get_room_response.dart';

class ChatSearchMatch {
  final int messageId;
  final int timestamp;

  const ChatSearchMatch({required this.messageId, required this.timestamp});
}

class ChatSearchController {
  /// System messages that are folded into other bubbles (reactions, poll
  /// votes, deletions) and therefore never rendered nor searched as their own
  /// entry.
  static bool isHiddenSystemMessage(GetChatResponseObject element) =>
      element.systemMessage.contains('reaction') ||
      element.systemMessage.contains('poll_voted') ||
      element.systemMessage.contains('message_deleted');

  static List<ChatSearchMatch> findMatches(
    GetChatResponse response,
    String query,
  ) {
    final q = query.trim().toLowerCase();
    if (q.isEmpty) return const [];

    final matches = <ChatSearchMatch>[];
    for (final element in response.sortByTimestamp()) {
      if (isHiddenSystemMessage(element)) continue;

      final haystackText = RichObjectStringProcessor.parseToString(
        element.message,
        element.messageParameters,
      ).toLowerCase();

      var matched = haystackText.contains(q);
      if (!matched &&
          element.messageType != GetRoomResponseObjectMessageType.system) {
        matched = element.actorDisplayName.toLowerCase().contains(q);
      }

      if (matched) {
        matches.add(
          ChatSearchMatch(
            messageId: element.id,
            timestamp: element.timestamp,
          ),
        );
      }
    }

    matches.sort((a, b) => b.timestamp.compareTo(a.timestamp));
    return matches;
  }
}