import 'package:brick_offline_first_with_supabase/brick_offline_first_with_supabase.dart';
import 'package:brick_offline_first_with_rest/offline_queue.dart';
import 'package:brick_sqlite/brick_sqlite.dart';
import 'package:brick_sqlite/memory_cache_provider.dart';
// Hide the brick_supabase @Supabase annotation to avoid conflict with
// supabase_flutter's Supabase singleton class.
import 'package:brick_supabase/brick_supabase.dart' hide Supabase;
import 'package:flutter/foundation.dart' show kIsWeb, debugPrint;
import 'package:http/http.dart' as http;
import 'package:sqflite/sqflite.dart' show databaseFactory;
import 'package:supabase_flutter/supabase_flutter.dart';

// Generated by `flutter pub run build_runner build`.
// Run: flutter pub run build_runner build --delete-conflicting-outputs
// ignore: uri_does_not_exist
import 'brick.g.dart';
// migrations + schema are generated into db/schema.g.dart
// ignore: uri_does_not_exist
import 'db/schema.g.dart';

export 'package:brick_offline_first_with_supabase/brick_offline_first_with_supabase.dart'
    show OfflineFirstWithSupabaseModel;
export 'package:brick_supabase/brick_supabase.dart'
    show SupabaseSerializable;
export 'package:brick_offline_first_with_supabase/brick_offline_first_with_supabase.dart'
    show ConnectOfflineFirstWithSupabase;
export 'package:brick_sqlite/brick_sqlite.dart' show SqliteSerializable;
export 'package:brick_offline_first/brick_offline_first.dart'
    show OfflineFirstGetPolicy;

/// Singleton offline-first repository backed by Supabase + local SQLite.
///
/// Initialization sequence in [main]:
/// ```dart
/// // 1. Get the Brick HTTP client (mobile only; null on web)
/// final httpClient = AppRepository.createHttpClient();
///
/// // 2. Initialize Supabase WITH the Brick HTTP client so all REST
/// //    writes are intercepted and queued when offline.
/// await Supabase.initialize(url: ..., anonKey: ..., httpClient: httpClient);
///
/// // 3. Configure the repository (reads model dictionary from brick.g.dart)
/// await AppRepository.configure();
/// ```
class AppRepository extends OfflineFirstWithSupabaseRepository {
  static AppRepository? _instance;
  static RestOfflineRequestQueue? _pendingQueue;

  /// The singleton. Throws if [configure] was not called first.
  static AppRepository get instance {
    assert(_instance != null, 'Call AppRepository.configure() first');
    return _instance!;
  }

  /// True when this platform supports offline SQLite storage (i.e. not web).
  static bool get isOfflineSupported => !kIsWeb;

  /// True after [configure] has completed successfully.
  static bool get isConfigured => _instance != null;

  /// The Brick HTTP offline queue. `null` before [configure] or on web.
  ///
  /// Call [RestOfflineRequestQueue.stop] when offline to silence retry logs
  /// and avoid hammering a network that is known to be unavailable.
  /// Call [RestOfflineRequestQueue.start] when back online to replay queued
  /// writes. The stored requests are preserved in both states.
  static RestOfflineRequestQueue? get offlineQueue =>
      _instance?.offlineRequestQueue;

  AppRepository._({
    required super.supabaseProvider,
    required super.sqliteProvider,
    required super.migrations,
    required super.offlineRequestQueue,
    super.memoryCacheProvider,
  });

  /// Creates and returns the Brick-managed HTTP client to pass to
  /// [Supabase.initialize]. Returns `null` on web (SQLite unavailable).
  ///
  /// Must be called *before* [Supabase.initialize] and *before* [configure].
  static http.Client? createHttpClient() {
    if (kIsWeb) return null;
    final (client, queue) = OfflineFirstWithSupabaseRepository.clientQueue(
      databaseFactory: databaseFactory,
      // Only retry on truly transient server errors.
      // 400/409 indicate a permanent failure (bad payload or conflict) and
      // should NOT be retried — they will never self-heal and cause infinite
      // retry loops that spam the logs.
      reattemptForStatusCodes: const [408, 429, 500, 502, 503, 504],
    );
    _pendingQueue = queue;
    return client;
  }

  /// Configures the repository singleton.
  ///
  /// Must be called *after* [Supabase.initialize]. Reads the Brick-generated
  /// model dictionaries from `brick.g.dart` (created by build_runner).
  static Future<void> configure() async {
    if (_instance != null) return;
    if (kIsWeb) {
      debugPrint('[AppRepository] web — offline queue disabled');
      return;
    }

    final queue = _pendingQueue;
    if (queue == null) {
      throw StateError(
        'Call AppRepository.createHttpClient() before configure()',
      );
    }

    _instance = AppRepository._(
      supabaseProvider: SupabaseProvider(
        Supabase.instance.client,
        modelDictionary: supabaseModelDictionary,
      ),
      sqliteProvider: SqliteProvider(
        'tasq_offline.sqlite',
        databaseFactory: databaseFactory,
        modelDictionary: sqliteModelDictionary,
      ),
      migrations: migrations,
      offlineRequestQueue: queue,
      memoryCacheProvider: MemoryCacheProvider(),
    );

    await _instance!.initialize();
    _pendingQueue = null;
    debugPrint('[AppRepository] initialized — offline queue active');
  }
}

/// Mirrors a Supabase realtime stream into the Brick local SQLite cache.
///
/// Wrap any `client.from('t').stream(...)` source so every emission is
/// upserted into Brick. The cache stays fresh during normal online use, which
/// means a cold launch with no network can read a recent snapshot via
/// `OfflineFirstGetPolicy.localOnly` instead of rendering an empty list.
///
/// Cache writes are fire-and-forget — they never block UI updates and any
/// upsert error is silently logged (mirroring is best-effort).
extension AppRepositoryStreamMirror on AppRepository {
  Stream<List<T>> mirroredStream<T extends OfflineFirstWithSupabaseModel>(
    Stream<List<T>> source,
  ) async* {
    await for (final batch in source) {
      for (final item in batch) {
        // Fire-and-forget; never block the UI on cache writes.
        // ignore: discarded_futures
        upsert<T>(item).catchError((Object e) {
          debugPrint('[AppRepository] mirror upsert<$T> failed: $e');
          return item;
        });
      }
      yield batch;
    }
  }
}