import 'package:flutter/foundation.dart' show debugPrint;

import 'repository.dart';

/// Returns the locally cached list of [T] from Brick SQLite, or `[]` if Brick
/// isn't configured or the read fails. Never throws.
///
/// Use this as `onOfflineData` for [StreamRecoveryWrapper] so that screens
/// render data from the local cache when the device is offline:
///
/// ```dart
/// onOfflineData: () => cachedListFromBrick<Task>(),
/// ```
Future<List<T>> cachedListFromBrick<T extends OfflineFirstWithSupabaseModel>() async {
  if (!AppRepository.isConfigured) {
    debugPrint('[cachedListFromBrick<$T>] BRICK NOT CONFIGURED — returning []');
    return const [];
  }
  try {
    final rows = await AppRepository.instance.get<T>(
      policy: OfflineFirstGetPolicy.localOnly,
    );
    if (rows.isEmpty) {
      debugPrint('[cachedListFromBrick<$T>] empty cache (0 rows)');
    }
    return rows;
  } catch (e) {
    debugPrint('[cachedListFromBrick<$T>] failed: $e');
    return const [];
  }
}

/// Mirrors a batch of model rows into Brick's local SQLite cache as a
/// fire-and-forget side effect. Errors are caught and logged.
///
/// Use this as `onCacheMirror` for [StreamRecoveryWrapper] so that every
/// realtime emission keeps the local cache fresh — required for the cold-
/// launch-offline experience.
///
/// ```dart
/// onCacheMirror: (rows) => mirrorBatchToBrick<Task>(rows, tag: 'tasks'),
/// ```
void mirrorBatchToBrick<T extends OfflineFirstWithSupabaseModel>(
  List<T> rows, {
  String tag = 'mirror',
}) {
  if (!AppRepository.isConfigured) return;
  // Use sqliteProvider directly (local-only write). AppRepository.upsert is
  // bidirectional — it re-POSTs rows to Supabase, which triggers RLS
  // violations for other users' records and deadlocks from concurrent writes.
  // Sequential processing prevents SQLite lock contention across providers.
  // ignore: discarded_futures
  Future(() async {
    for (final row in rows) {
      try {
        await AppRepository.instance.sqliteProvider
            .upsert<T>(row, repository: AppRepository.instance);
      } catch (e) {
        debugPrint('[$tag] mirror upsert<$T> failed: $e');
      }
    }
  });
}