import "package:collection/collection.dart";
import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:nexus/controllers/client.dart";
import "package:nexus/controllers/rooms.dart";
import "package:nexus/models/event.dart";
import "package:nexus/models/requests/get_event.dart";

class EventController(final GetEventRequest request)
    extends AsyncNotifier<Event?> {
  @override
  Future<Event?> build() async {
    final room = ref.watch(
      RoomsController.provider.select((value) => value[request.roomId]),
    );
    final event = room?.events.values.firstWhereOrNull(
      (event) => event.eventId == request.eventId,
    );

    if (event != null) return event;

    final fetchedEvent = await ref
        .watch(ClientController.provider.notifier)
        .getEvent(request)
        .onError((_, _) => null);

    if (fetchedEvent != null) {
      ref
          .watch(RoomsController.provider.notifier)
          .update(
            .new({
              request.roomId: .new(
                events: .new({fetchedEvent.rowId: fetchedEvent}),
              ),
            }),
          );

      return fetchedEvent;
    }

    return null;
  }

  static final provider = AsyncNotifierProvider.family
      .autoDispose<EventController, Event?, GetEventRequest>(
        EventController.new,
      );
}