import 'package:hiddify/core/prefs/prefs.dart';
import 'package:hiddify/core/prefs/service_prefs.dart';
import 'package:hiddify/data/data_providers.dart';
import 'package:hiddify/domain/connectivity/connectivity.dart';
import 'package:hiddify/domain/core_facade.dart';
import 'package:hiddify/features/common/active_profile/active_profile_notifier.dart';
import 'package:hiddify/utils/utils.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:rxdart/rxdart.dart';

part 'connectivity_controller.g.dart';

@Riverpod(keepAlive: true)
class ConnectivityController extends _$ConnectivityController with AppLogger {
  @override
  Stream<ConnectionStatus> build() {
    ref.listen(
      activeProfileProvider.select((value) => value.asData?.value),
      (previous, next) async {
        if (previous == null) return;
        final shouldReconnect = next == null || previous.id != next.id;
        if (shouldReconnect) {
          await reconnect(next?.id);
        }
      },
    );
    return _core.watchConnectionStatus().doOnData((event) {
      if (event case Disconnected(:final connectionFailure?)
          when PlatformUtils.isDesktop) {
        ref.read(startedByUserProvider.notifier).update(false);
      }
      loggy.info("connection status: ${event.format()}");
    });
  }

  CoreFacade get _core => ref.watch(coreFacadeProvider);

  Future<void> mayConnect() async {
    if (state case AsyncData(:final value)) {
      if (value case Disconnected()) return _connect();
    }
  }

  Future<void> toggleConnection() async {
    if (state case AsyncError()) {
      await _connect();
    } else if (state case AsyncData(:final value)) {
      switch (value) {
        case Disconnected():
          await ref.read(startedByUserProvider.notifier).update(true);
          await _connect();
        case Connected():
          await ref.read(startedByUserProvider.notifier).update(false);
          await _disconnect();
        default:
          loggy.warning("switching status, debounce");
      }
    }
  }

  Future<void> reconnect(String? profileId) async {
    if (state case AsyncData(:final value) when value == const Connected()) {
      if (profileId == null) {
        loggy.info("no active profile, disconnecting");
        return _disconnect();
      }
      loggy.info("active profile changed, reconnecting");
      await ref.read(startedByUserProvider.notifier).update(true);
      await _core
          .restart(profileId, ref.read(disableMemoryLimitProvider))
          .mapLeft((err) {
        loggy.warning("error reconnecting", err);
        state = AsyncError(err, StackTrace.current);
      }).run();
    }
  }

  Future<void> abortConnection() async {
    if (state case AsyncData(:final value)) {
      switch (value) {
        case Connected() || Connecting():
          loggy.debug("aborting connection");
          await _disconnect();
        default:
      }
    }
  }

  Future<void> _connect() async {
    final activeProfile = await ref.read(activeProfileProvider.future);
    await _core
        .start(activeProfile!.id, ref.read(disableMemoryLimitProvider))
        .mapLeft((err) async {
      loggy.warning("error connecting", err);
      await ref.read(startedByUserProvider.notifier).update(false);
      state = AsyncError(err, StackTrace.current);
    }).run();
  }

  Future<void> _disconnect() async {
    await _core.stop().mapLeft((err) {
      loggy.warning("error disconnecting", err);
      state = AsyncError(err, StackTrace.current);
    }).run();
  }
}

@Riverpod(keepAlive: true)
Future<bool> serviceRunning(ServiceRunningRef ref) => ref
    .watch(
      connectivityControllerProvider.selectAsync((data) => data.isConnected),
    )
    .onError((error, stackTrace) => false);