import 'dart:async';

import 'package:logging/logging.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:stack_trace/stack_trace.dart';

import '../models/auth/profile.dart';
import 'account_services.dart';
import 'connection_manager_services.dart';
import 'persistent_info_services.dart';
import 'settings_services.dart';

part 'background_updater_services.g.dart';

const _connectionsRefreshInterval = Duration(hours: 12);
const _timerRefresh = Duration(minutes: 5);
final _logger = Logger('BackgroundUpdatersProvider');

// TODO should this stop and be deleted if a profile is switched?
// TODO Confirm this is being bootstrapped correctly and running consistently
@Riverpod(keepAlive: true)
class BackgroundUpdaters extends _$BackgroundUpdaters {
  bool _executingUpdate = false;

  @override
  Timer build(Profile profile) {
    _logger.info('Building BackgroundUpdater for $profile');
    ref.onDispose(() {
      _logger.info('Disposing of Background updater for $profile');
      state.cancel();
    });
    return Timer.periodic(_timerRefresh, (_) async {
      await _executeUpdatesForProfile();
    });
  }

  Timer stop() {
    _logger.info('Stopping background updates for $profile');
    state.cancel();
    return state;
  }

  Timer reset() {
    _logger.info('Resetting background updates for $profile');
    state.cancel();
    state = Timer.periodic(_timerRefresh, (_) async {
      await _executeUpdatesForProfile();
    });
    return state;
  }

  Future<void> _executeUpdatesForProfile() async {
    _logger.fine('_executeUpdatesForProfile for $profile');
    if (_executingUpdate) {
      _logger.fine('Already executing updating so skipping for $profile');
      return;
    }

    final lowBandwidthMode = ref.watch(lowBandwidthModeSettingProvider);

    if (lowBandwidthMode) {
      _logger.fine('low bandwidth mode so skipping for $profile');
      return;
    }

    if (ref.read(activeProfileProvider) != profile) {
      _logger.fine('Skipping update since no longer active profile: $profile');
      state.cancel();
      return;
    }

    _logger.fine('Executing background update for $profile');
    final dt =
        DateTime.now().difference(ref.watch(persistentInfoProvider(profile)));
    _logger.fine('Time since last update for ${profile.id}: $dt');
    if (dt >= _connectionsRefreshInterval) {
      if (_executingUpdate) {
        _logger.fine('Already executing updating so skipping for $profile');
        return;
      }
      _executingUpdate = true;
      try {
        await ref
            .read(allContactsUpdaterProvider(profile).notifier)
            .updateAllContacts(true);
      } catch (e) {
        _logger.severe(
            'Exception thrown while executing update: $e', Trace.current());
      }
      _executingUpdate = false;
    }
  }
}