network-app-mobile/test/features/clients/clients_screen_test.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:network_app/features/clients/presentation/clients_screen.dart';
import 'package:network_app/shared/services/api_client.dart';
import 'package:mocktail/mocktail.dart';

class MockApiClient extends Mock implements ApiClient {}

void main() {
  late MockApiClient mockApiClient;

  setUp(() {
    mockApiClient = MockApiClient();
  });

  Widget createTestWidget() {
    return ProviderScope(
      overrides: [
        apiClientProvider.overrideWithValue(mockApiClient),
      ],
      child: MaterialApp(
        home: const ClientsScreen(),
      ),
    );
  }

  final testClients = [
    {
      'id': '1',
      'firstName': 'John',
      'lastName': 'Doe',
      'email': 'john@example.com',
      'company': 'Acme Corp',
      'tags': ['vip', 'active'],
    },
    {
      'id': '2',
      'firstName': 'Jane',
      'lastName': 'Smith',
      'email': 'jane@example.com',
      'company': 'Tech Inc',
      'tags': ['new'],
    },
  ];

  group('ClientsScreen Widget Tests', () {
    testWidgets('shows loading indicator initially', (tester) async {
      final completer = Completer<List<Map<String, dynamic>>>();
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) => completer.future);

      await tester.pumpWidget(createTestWidget());
      await tester.pump();
      
      expect(find.byType(CircularProgressIndicator), findsOneWidget);
      
      // Complete the future to cleanup
      completer.complete(testClients);
      await tester.pumpAndSettle();
    });

    testWidgets('displays client list', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('John Doe'), findsOneWidget);
      expect(find.text('Jane Smith'), findsOneWidget);
    });

    testWidgets('displays company names', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('Acme Corp'), findsOneWidget);
      expect(find.text('Tech Inc'), findsOneWidget);
    });

    testWidgets('displays client tags', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('vip'), findsOneWidget);
      expect(find.text('active'), findsOneWidget);
      expect(find.text('new'), findsOneWidget);
    });

    testWidgets('shows empty state when no clients', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => []);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('No clients yet'), findsOneWidget);
      expect(find.text('Add Client'), findsOneWidget);
    });

    testWidgets('shows search bar', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.byType(TextField), findsOneWidget);
      expect(find.text('Search clients...'), findsOneWidget);
    });

    testWidgets('has floating action button', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.byType(FloatingActionButton), findsOneWidget);
      expect(find.byIcon(Icons.add), findsOneWidget);
    });

    testWidgets('shows error state on API failure', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenThrow(Exception('Network error'));

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('Failed to load clients'), findsOneWidget);
      expect(find.text('Retry'), findsOneWidget);
    });

    testWidgets('displays client initials in avatar', (tester) async {
      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => testClients);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('JD'), findsOneWidget); // John Doe
      expect(find.text('JS'), findsOneWidget); // Jane Smith
    });

    testWidgets('search filters results', (tester) async {
      when(() => mockApiClient.getClients(search: null))
          .thenAnswer((_) async => testClients);
      when(() => mockApiClient.getClients(search: 'John'))
          .thenAnswer((_) async => [testClients[0]]);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      // Initial state shows all clients
      expect(find.text('John Doe'), findsOneWidget);
      expect(find.text('Jane Smith'), findsOneWidget);

      // Enter search
      await tester.enterText(find.byType(TextField), 'John');
      await tester.testTextInput.receiveAction(TextInputAction.done);
      await tester.pumpAndSettle();

      // Should only show John
      expect(find.text('John Doe'), findsOneWidget);
      expect(find.text('Jane Smith'), findsNothing);
    });

    testWidgets('shows no results message for search', (tester) async {
      when(() => mockApiClient.getClients(search: null))
          .thenAnswer((_) async => testClients);
      when(() => mockApiClient.getClients(search: 'xyz'))
          .thenAnswer((_) async => []);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      await tester.enterText(find.byType(TextField), 'xyz');
      await tester.testTextInput.receiveAction(TextInputAction.done);
      await tester.pumpAndSettle();

      expect(find.text('No clients found'), findsOneWidget);
    });

    testWidgets('limits displayed tags to 3', (tester) async {
      final clientWithManyTags = [
        {
          'id': '1',
          'firstName': 'John',
          'lastName': 'Doe',
          'email': 'john@example.com',
          'company': 'Acme',
          'tags': ['tag1', 'tag2', 'tag3', 'tag4', 'tag5'],
        },
      ];

      when(() => mockApiClient.getClients(search: any(named: 'search')))
          .thenAnswer((_) async => clientWithManyTags);

      await tester.pumpWidget(createTestWidget());
      await tester.pumpAndSettle();

      expect(find.text('tag1'), findsOneWidget);
      expect(find.text('tag2'), findsOneWidget);
      expect(find.text('tag3'), findsOneWidget);
      expect(find.text('tag4'), findsNothing); // Should not show 4th tag
    });
  });
}