import 'dart:io';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/annotations.dart';
import 'package:app_boilerplate/core/exceptions/firebase_exception.dart' show FirebaseServiceException;
import 'package:app_boilerplate/data/firebase/firebase_service.dart';
import 'package:app_boilerplate/data/firebase/models/firebase_config.dart';
import 'package:app_boilerplate/data/local/local_storage_service.dart';
import 'package:sqflite_common_ffi/sqflite_ffi.dart';
import 'package:path/path.dart' as path;

import 'firebase_service_test.mocks.dart';

@GenerateMocks([LocalStorageService])
void main() {
  // Initialize Flutter bindings and sqflite for testing
  TestWidgetsFlutterBinding.ensureInitialized();
  sqfliteFfiInit();
  databaseFactory = databaseFactoryFfi;

  late MockLocalStorageService mockLocalStorage;
  late Directory tempDir;

  setUp(() async {
    tempDir = await Directory.systemTemp.createTemp('firebase_test_');
    mockLocalStorage = MockLocalStorageService();
  });

  tearDown(() async {
    if (await tempDir.exists()) {
      await tempDir.delete(recursive: true);
    }
  });

  group('FirebaseService - Configuration', () {
    test('service is disabled when config.enabled is false', () {
      final config = FirebaseConfig.disabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(service.isEnabled, isFalse);
      expect(service.isLoggedIn, isFalse);
    });

    test('service can be enabled with config', () {
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Service is not initialized yet, so isEnabled is false
      expect(service.isEnabled, isFalse);
    });
  });

  group('FirebaseService - Initialization', () {
    test('initialize does nothing when Firebase is disabled', () async {
      final config = FirebaseConfig.disabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Should not throw even though Firebase is not set up
      // (In real app, Firebase.initializeApp() would fail, but we're testing disabled case)
      expect(() => service.initialize(), returnsNormally);
    });

    test('initialize fails gracefully when Firebase not configured', () async {
      // This test verifies that when Firebase is enabled but not configured,
      // the service handles the error gracefully
      // Note: In real scenarios, Firebase.initializeApp() requires actual config files
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // In a test environment without Firebase config, this will fail
      // but that's expected - Firebase requires actual project setup
      expect(
        () => service.initialize(),
        throwsA(isA<FirebaseServiceException>()),
      );
    });
  });

  group('FirebaseService - Authentication', () {
    test('loginWithEmailPassword throws when auth disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        authEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.loginWithEmailPassword(
          email: 'test@example.com',
          password: 'password123',
        ),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('loginWithEmailPassword throws when not initialized', () async {
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.loginWithEmailPassword(
          email: 'test@example.com',
          password: 'password123',
        ),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('logout throws when auth disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        authEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.logout(),
        throwsA(isA<FirebaseServiceException>()),
      );
    });
  });

  group('FirebaseService - Firestore Sync', () {
    test('syncItemsToFirestore throws when Firestore disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        firestoreEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.syncItemsToFirestore('user1'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('syncItemsToFirestore throws when not initialized', () async {
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.syncItemsToFirestore('user1'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('syncItemsFromFirestore throws when Firestore disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        firestoreEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.syncItemsFromFirestore('user1'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('syncItemsFromFirestore throws when not initialized', () async {
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      expect(
        () => service.syncItemsFromFirestore('user1'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });
  });

  group('FirebaseService - Storage', () {
    test('uploadFile throws when Storage disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        storageEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      final testFile = File(path.join(tempDir.path, 'test.txt'));
      await testFile.writeAsString('test content');

      expect(
        () => service.uploadFile(testFile, 'test/path.txt'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });

    test('uploadFile throws when not initialized', () async {
      final config = FirebaseConfig.enabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      final testFile = File(path.join(tempDir.path, 'test.txt'));
      await testFile.writeAsString('test content');

      expect(
        () => service.uploadFile(testFile, 'test/path.txt'),
        throwsA(isA<FirebaseServiceException>()),
      );
    });
  });

  group('FirebaseService - Messaging', () {
    test('getFcmToken returns null when messaging disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        messagingEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      final token = await service.getFcmToken();
      expect(token, isNull);
    });
  });

  group('FirebaseService - Analytics', () {
    test('logEvent does nothing when Analytics disabled', () async {
      final config = FirebaseConfig(
        enabled: true,
        analyticsEnabled: false,
      );
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Should not throw even though Analytics is disabled
      await service.logEvent('test_event');
    });

    test('logEvent does nothing when Firebase disabled', () async {
      final config = FirebaseConfig.disabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Should not throw even though Firebase is disabled
      await service.logEvent('test_event');
    });
  });

  group('FirebaseService - Offline Scenarios', () {
    test('service maintains offline-first behavior when disabled', () async {
      final config = FirebaseConfig.disabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Service should not interfere with local storage operations
      expect(service.isEnabled, isFalse);
      expect(service.isLoggedIn, isFalse);
    });

    test('service can be disposed safely', () async {
      final config = FirebaseConfig.disabled();
      final service = FirebaseService(
        config: config,
        localStorage: mockLocalStorage,
      );

      // Should not throw
      await service.dispose();
    });
  });
}