import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail/mocktail.dart';
import 'package:todo_app/features/todo/domain/entities/todo.dart';
import 'package:todo_app/features/todo/domain/repositories/todo_repository.dart';
import 'package:todo_app/features/todo/presentation/providers/todo_providers.dart';
import 'package:todo_app/features/todo/presentation/screens/todo_list_screen.dart';

class MockTodoRepository extends Mock implements TodoRepository {}

void main() {
  late MockTodoRepository repository;

  final testTodo = Todo(
    id: '1',
    title: 'Test Todo',
    priority: 'medium',
    sortOrder: 0,
    createdAt: DateTime(2026, 1, 1),
    updatedAt: DateTime(2026, 1, 1),
  );

  Widget createWidgetUnderTest() {
    return ProviderScope(
      overrides: [
        todoRepositoryProvider.overrideWithValue(repository),
      ],
      child: const MaterialApp(
        home: TodoListScreen(),
      ),
    );
  }

  setUp(() {
    repository = MockTodoRepository();
  });

  testWidgets('shows loading indicator initially', (tester) async {
    when(() => repository.getTodos(
          priorityFilter: any(named: 'priorityFilter'),
          completedFilter: any(named: 'completedFilter'),
        )).thenAnswer((_) async => [testTodo]);

    await tester.pumpWidget(createWidgetUnderTest());

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
  });

  testWidgets('shows todo list when loaded', (tester) async {
    when(() => repository.getTodos(
          priorityFilter: any(named: 'priorityFilter'),
          completedFilter: any(named: 'completedFilter'),
        )).thenAnswer((_) async => [testTodo]);

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

    expect(find.text('Test Todo'), findsOneWidget);
    expect(find.text('MEDIUM'), findsOneWidget);
  });

  testWidgets('shows empty state when no todos', (tester) async {
    when(() => repository.getTodos(
          priorityFilter: any(named: 'priorityFilter'),
          completedFilter: any(named: 'completedFilter'),
        )).thenAnswer((_) async => []);

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

    expect(find.text('No todos yet'), findsOneWidget);
    expect(find.text('Create Todo'), findsOneWidget);
  });

  testWidgets('shows error state with retry button', (tester) async {
    when(() => repository.getTodos(
          priorityFilter: any(named: 'priorityFilter'),
          completedFilter: any(named: 'completedFilter'),
        )).thenThrow(Exception('Failed'));

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

    expect(find.text('Something went wrong'), findsOneWidget);
    expect(find.text('Retry'), findsOneWidget);
  });

  testWidgets('has FAB to create new todo', (tester) async {
    when(() => repository.getTodos(
          priorityFilter: any(named: 'priorityFilter'),
          completedFilter: any(named: 'completedFilter'),
        )).thenAnswer((_) async => []);

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

    expect(find.byType(FloatingActionButton), findsOneWidget);
  });
}