import 'dart:async';
import 'dart:convert';
import 'dart:developer';

import 'package:home_widget/home_widget.dart';

import 'widget_data.dart';

/// Bridge to the native widget host. All keys/names live here so the Kotlin
/// and Swift sides stay in sync.
class WidgetSync {
  static const String iosAppGroupId =
      'group.eu.mhsl.marianum.mobile.client.widget';

  static const String iosWidgetKind = 'TimetableWidget';
  static const String androidDayProvider = 'TimetableDayWidget';
  static const String androidWeekProvider = 'TimetableWeekWidget';

  // `_v1` suffix lets a future schema change invalidate stale snapshots
  // by bumping the key instead of risking a parse crash.
  static const String dayDataKey = 'widget_data_day_v1';
  static const String weekDataKey = 'widget_data_week_v1';
  static const String fetchedAtKey = 'widget_data_fetched_at_v1';
  static const String loggedInKey = 'widget_data_logged_in_v1';
  // Mirrored into widget storage so the background isolate can read it
  // without reopening HydratedBloc storage.
  static const String connectDoubleLessonsKey =
      'widget_setting_connect_double_lessons_v1';
  static const String themeModeKey = 'widget_setting_theme_mode_v1';

  static bool _initialised = false;

  static Future<void> ensureInitialized() async {
    if (_initialised) return;
    await HomeWidget.setAppGroupId(iosAppGroupId);
    _initialised = true;
  }

  static Future<void> writeDayData(WidgetTimetableData data) async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<String>(dayDataKey, jsonEncode(data.toJson()));
    await HomeWidget.saveWidgetData<String>(
      fetchedAtKey,
      data.fetchedAt.toIso8601String(),
    );
  }

  static Future<void> writeWeekData(WidgetTimetableData data) async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<String>(
      weekDataKey,
      jsonEncode(data.toJson()),
    );
    await HomeWidget.saveWidgetData<String>(
      fetchedAtKey,
      data.fetchedAt.toIso8601String(),
    );
  }

  static Future<void> setLoggedIn(bool loggedIn) async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<bool>(loggedInKey, loggedIn);
  }

  static Future<void> setConnectDoubleLessons(bool value) async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<bool>(connectDoubleLessonsKey, value);
  }

  /// Default `true` matches `default_settings.dart` — fresh install behaves
  /// like the in-app calendar.
  static Future<bool> getConnectDoubleLessons() async {
    await ensureInitialized();
    final value = await HomeWidget.getWidgetData<bool>(
      connectDoubleLessonsKey,
      defaultValue: true,
    );
    return value ?? true;
  }

  static Future<void> setThemeMode(String mode) async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<String>(themeModeKey, mode);
  }

  static Future<void> clear() async {
    await ensureInitialized();
    await HomeWidget.saveWidgetData<String>(dayDataKey, null);
    await HomeWidget.saveWidgetData<String>(weekDataKey, null);
    await HomeWidget.saveWidgetData<String>(fetchedAtKey, null);
    await HomeWidget.saveWidgetData<bool>(loggedInKey, false);
  }

  static Future<void> triggerUpdate() async {
    await ensureInitialized();
    try {
      await HomeWidget.updateWidget(
        androidName: androidDayProvider,
        iOSName: iosWidgetKind,
      );
      await HomeWidget.updateWidget(
        androidName: androidWeekProvider,
        iOSName: iosWidgetKind,
      );
    } on Exception catch (e) {
      log('WidgetSync.triggerUpdate failed: $e');
    }
  }
}