import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/annotations.dart';
import 'package:mockito/mockito.dart';
import 'package:app_boilerplate/ui/navigation/main_navigation_scaffold.dart';
import 'package:app_boilerplate/ui/navigation/app_router.dart';
import 'package:app_boilerplate/data/local/local_storage_service.dart';
import 'package:app_boilerplate/data/nostr/nostr_service.dart';
import 'package:app_boilerplate/data/nostr/models/nostr_keypair.dart';
import 'package:app_boilerplate/data/sync/sync_engine.dart';
import 'package:app_boilerplate/data/session/session_service.dart';
import 'package:app_boilerplate/data/session/models/user.dart';
import 'package:app_boilerplate/data/firebase/firebase_service.dart';
import 'package:app_boilerplate/data/recipes/recipe_service.dart';
import 'package:app_boilerplate/core/service_locator.dart';

import 'main_navigation_scaffold_test.mocks.dart';

@GenerateMocks([
  LocalStorageService,
  NostrService,
  SyncEngine,
  SessionService,
  FirebaseService,
])
void main() {
  late MockLocalStorageService mockLocalStorageService;
  late MockNostrService mockNostrService;
  late MockSyncEngine mockSyncEngine;
  late MockSessionService mockSessionService;
  late MockFirebaseService mockFirebaseService;

  setUp(() async {
    mockLocalStorageService = MockLocalStorageService();
    mockNostrService = MockNostrService();
    mockSyncEngine = MockSyncEngine();
    mockSessionService = MockSessionService();
    mockFirebaseService = MockFirebaseService();
    
    // Set default return values for mocks
    when(mockSessionService.isLoggedIn).thenReturn(false);
    when(mockSessionService.currentUser).thenReturn(null);
    when(mockFirebaseService.isEnabled).thenReturn(false);
    when(mockNostrService.getRelays()).thenReturn([]);
    
    // Stub LocalStorageService.getItem for app_settings (used by RelayManagementScreen)
    when(mockLocalStorageService.getItem('app_settings')).thenAnswer((_) async => null);
    when(mockLocalStorageService.getItem('app_preferences')).thenAnswer((_) async => null);
    
    // Stub NostrService methods that might be called by UI
    final mockKeyPair = NostrKeyPair.generate();
    when(mockNostrService.generateKeyPair()).thenReturn(mockKeyPair);
    
    // Create a RecipeService for tests (needed by RecipesScreen)
    // Use a simple setup - RecipesScreen will handle initialization errors gracefully
    RecipeService? recipeService;
    try {
      recipeService = RecipeService(
        localStorage: mockLocalStorageService,
        nostrService: mockNostrService,
      );
      // Don't initialize here - let screens handle it or fail gracefully
    } catch (e) {
      // RecipeService creation failed, that's ok for tests
      recipeService = null;
    }
    
    // Register services with ServiceLocator
    ServiceLocator.instance.registerServices(
      localStorageService: mockLocalStorageService,
      nostrService: mockNostrService,
      syncEngine: mockSyncEngine,
      sessionService: mockSessionService,
      firebaseService: mockFirebaseService,
      recipeService: recipeService,
    );
  });

  tearDown(() {
    // Reset ServiceLocator after each test
    ServiceLocator.instance.reset();
  });

  Widget createTestWidget() {
    final appRouter = AppRouter(
      sessionService: mockSessionService,
      localStorageService: mockLocalStorageService,
      nostrService: mockNostrService,
      syncEngine: mockSyncEngine,
      firebaseService: mockFirebaseService,
    );

    return MaterialApp(
      onGenerateRoute: appRouter.generateRoute,
      home: const MainNavigationScaffold(),
    );
  }

  group('MainNavigationScaffold - Navigation', () {
    testWidgets('displays bottom navigation bar with correct tabs', (WidgetTester tester) async {
      // When not logged in, only Home tab is visible in bottom nav
      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      // Check for navigation icons (custom bottom nav, not standard BottomNavigationBar)
      expect(find.byIcon(Icons.home), findsWidgets);
      
      // Check for labels
      expect(find.text('Home'), findsWidgets);
      
      // User icon is now in AppBar, not bottom nav
      // Recipes, Favourites, and Add button in bottom nav are hidden when not logged in
      expect(find.text('Recipes'), findsNothing);
      expect(find.text('Favourites'), findsNothing);
      // Note: Home screen may have its own add icon, so we check for the bottom nav add button specifically
      // The bottom nav add button is in a Material widget with CircleBorder
      expect(find.text('Add Recipe'), findsNothing);
    });

    testWidgets('displays Add Recipe button in center of bottom nav', (WidgetTester tester) async {
      // Set up as logged in to see Add button
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);
      
      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build

      // Find the add icon in the bottom navigation (should be in center)
      expect(find.byIcon(Icons.add), findsWidgets);
      // The add button is now part of the custom bottom nav, not a FloatingActionButton
    });

    testWidgets('renders Home screen by default', (WidgetTester tester) async {
      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      // Home text should appear in AppBar
      expect(find.text('Home'), findsWidgets);
      expect(find.byIcon(Icons.home), findsWidgets);
    });

    testWidgets('can navigate to Recipes screen', (WidgetTester tester) async {
      // Set up as logged in to access Recipes tab
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);
      
      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build

      // Tap Recipes tab
      final recipesTab = find.text('Recipes');
      expect(recipesTab, findsWidgets);
      await tester.tap(recipesTab);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation

      // Verify Recipes screen is shown (check for AppBar title)
      expect(find.text('Recipes'), findsWidgets);
    });

    testWidgets('can navigate to Favourites screen', (WidgetTester tester) async {
      // Set up as logged in to access Favourites tab
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);
      
      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build

      // Tap Favourites tab
      final favouritesTab = find.text('Favourites');
      expect(favouritesTab, findsWidgets);
      await tester.tap(favouritesTab);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation

      // Verify Favourites screen is shown
      expect(find.text('Favourites'), findsWidgets);
    });

    testWidgets('can navigate to User/Session screen', (WidgetTester tester) async {
      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      // Tap User icon in AppBar (person icon)
      final userIcon = find.byIcon(Icons.person);
      expect(userIcon, findsWidgets);
      // Tap the first person icon (should be in AppBar)
      await tester.tap(userIcon.first);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation

      // Verify User screen is shown
      expect(find.text('User'), findsWidgets);
    });

    testWidgets('Add Recipe button navigates to Add Recipe screen', (WidgetTester tester) async {
      // Set up as logged in to see Add button
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);
      
      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build

      // Find the add icon in the bottom navigation (there may be multiple - Home screen has one too)
      // We want the one in the bottom nav, which should be the last one or in a Material widget
      final addButtons = find.byIcon(Icons.add);
      expect(addButtons, findsWidgets);
      
      // Tap the last add button (should be the bottom nav one)
      await tester.tap(addButtons.last);
      
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 200)); // Allow navigation

      // Verify Add Recipe screen is shown (check for AppBar title)
      // If navigation worked, we should see "Add Recipe" in the AppBar
      expect(find.text('Add Recipe'), findsWidgets);
    });

    testWidgets('settings icon appears in AppBar', (WidgetTester tester) async {
      // Set up as logged in to access User screen
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);

      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build
      
      // Navigate to User screen via AppBar icon (only screen with settings icon)
      final userIcon = find.byIcon(Icons.person);
      expect(userIcon, findsWidgets);
      await tester.tap(userIcon.first);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation

      // Settings icon should be in AppBar actions
      expect(find.byIcon(Icons.settings), findsWidgets);
    });

    testWidgets('settings icon is tappable and triggers navigation', (WidgetTester tester) async {
      // Set up as logged in to access User screen
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);

      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build
      
      // Navigate to User screen via AppBar icon (only screen with settings icon)
      final userIcon = find.byIcon(Icons.person);
      expect(userIcon, findsWidgets);
      await tester.tap(userIcon.first);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation
      
      // Find settings icon in AppBar
      final settingsIcons = find.byIcon(Icons.settings);
      expect(settingsIcons, findsWidgets);
      
      // Tap the settings icon (should be in AppBar)
      // This should trigger navigation to Relay Management
      await tester.tap(settingsIcons.first);
      await tester.pump(); // Just pump once to trigger navigation
      
      // Verify navigation was attempted (no errors thrown)
      // The actual screen content depends on service availability in test environment
    });
  });

  group('MainNavigationScaffold - Screen Rendering', () {
    testWidgets('renders all main screens correctly', (WidgetTester tester) async {
      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      // Verify scaffold structure exists
      // Custom bottom nav (not standard BottomNavigationBar)
      expect(find.byType(Scaffold), findsWidgets);
      expect(find.byType(IndexedStack), findsOneWidget);
      // Verify navigation icons are present
      expect(find.byIcon(Icons.home), findsWidgets);
    });

    testWidgets('User screen has settings icon in AppBar', (WidgetTester tester) async {
      // Set up as logged in to access all tabs
      when(mockSessionService.isLoggedIn).thenReturn(true);
      final testUser = User(id: 'test_user', username: 'Test User');
      when(mockSessionService.currentUser).thenReturn(testUser);
      
      await tester.pumpWidget(createTestWidget());
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow widget to build

      // Navigate to User screen via AppBar icon (only screen with settings icon)
      final userIcon = find.byIcon(Icons.person);
      expect(userIcon, findsWidgets);
      await tester.tap(userIcon.first);
      await tester.pump(); // Initial pump
      await tester.pump(const Duration(milliseconds: 100)); // Allow navigation
      expect(find.byIcon(Icons.settings), findsWidgets);
    });
  });
}