import 'package:cyberhybridhub/data/remote/spelling_words_remote_store.dart';
import 'package:cyberhybridhub/screens/spelling_list_screen.dart';
import 'package:cyberhybridhub/theme/app_theme.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

class MockSpellingWordsRemoteStore extends SpellingWordsRemoteStore {
  MockSpellingWordsRemoteStore({
    this.words = const <String>[],
    this.fetchWordsResult,
    this.deleteWordResult,
    this.deleteWordError,
  });

  List<String> words;
  List<String>? fetchWordsResult;
  List<String>? deleteWordResult;
  Object? deleteWordError;

  final List<String> deletedWords = <String>[];
  int fetchCount = 0;
  int deleteCount = 0;

  @override
  Future<List<String>> fetchWords() async {
    fetchCount++;
    if (fetchWordsResult != null) {
      return fetchWordsResult!;
    }
    return words;
  }

  @override
  Future<List<String>> deleteWord(String word) async {
    deleteCount++;
    deletedWords.add(word);
    if (deleteWordError != null) {
      throw deleteWordError!;
    }
    if (deleteWordResult != null) {
      return deleteWordResult!;
    }
    final List<String> newWords = List<String>.from(words)..remove(word);
    return newWords;
  }
}

void main() {
  testWidgets('lists words loaded from remote store', (WidgetTester tester) async {
    final mockStore = MockSpellingWordsRemoteStore(
      words: ['apple', 'banana', 'cherry'],
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: SpellingListScreen(api: mockStore),
      ),
    );

    // Shows loading first
    expect(find.byType(CircularProgressIndicator), findsOneWidget);

    await tester.pumpAndSettle();

    // Verify loading is gone and words are displayed
    expect(find.byType(CircularProgressIndicator), findsNothing);
    expect(find.text('apple'), findsOneWidget);
    expect(find.text('banana'), findsOneWidget);
    expect(find.text('cherry'), findsOneWidget);
    expect(find.byKey(const Key('spelling-word-delete-apple')), findsOneWidget);
    expect(find.byKey(const Key('spelling-word-delete-banana')), findsOneWidget);
    expect(find.byKey(const Key('spelling-word-delete-cherry')), findsOneWidget);
  });

  testWidgets('delete button cancel does not call delete API and leaves list intact',
      (WidgetTester tester) async {
    final mockStore = MockSpellingWordsRemoteStore(
      words: ['apple', 'banana'],
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: SpellingListScreen(api: mockStore),
      ),
    );
    await tester.pumpAndSettle();

    // Tap delete button for apple
    await tester.tap(find.byKey(const Key('spelling-word-delete-apple')));
    await tester.pumpAndSettle();

    // Verify confirmation dialog is visible
    expect(find.byKey(const Key('spelling-word-delete-confirm-dialog')), findsOneWidget);
    expect(find.text('Delete spelling word?'), findsOneWidget);
    expect(find.textContaining('This deletes "apple"'), findsOneWidget);

    // Tap Cancel
    await tester.tap(find.text('Cancel'));
    await tester.pumpAndSettle();

    // Dialog should be gone
    expect(find.byKey(const Key('spelling-word-delete-confirm-dialog')), findsNothing);

    // Store is not called
    expect(mockStore.deleteCount, 0);
    expect(mockStore.deletedWords, isEmpty);

    // Words still exist
    expect(find.text('apple'), findsOneWidget);
    expect(find.text('banana'), findsOneWidget);
  });

  testWidgets('delete button confirm calls delete API, updates UI list, and shows snackbar',
      (WidgetTester tester) async {
    final mockStore = MockSpellingWordsRemoteStore(
      words: ['apple', 'banana'],
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: SpellingListScreen(api: mockStore),
      ),
    );
    await tester.pumpAndSettle();

    // Tap delete button for apple
    await tester.tap(find.byKey(const Key('spelling-word-delete-apple')));
    await tester.pumpAndSettle();

    // Tap Delete inside dialog
    await tester.tap(find.byKey(const Key('spelling-word-delete-confirm-button')));
    await tester.pump(); // Start async action

    // Verify mockStore is called
    expect(mockStore.deleteCount, 1);
    expect(mockStore.deletedWords, ['apple']);

    await tester.pumpAndSettle();

    // Dialog should be gone
    expect(find.byKey(const Key('spelling-word-delete-confirm-dialog')), findsNothing);

    // List is updated
    expect(find.text('apple'), findsNothing);
    expect(find.text('banana'), findsOneWidget);

    // Snackbar is shown
    expect(find.text('Deleted "apple"'), findsOneWidget);
  });

  testWidgets('delete failure shows error snackbar and retains word in list',
      (WidgetTester tester) async {
    final mockStore = MockSpellingWordsRemoteStore(
      words: ['apple', 'banana'],
      deleteWordError: Exception('Failed to delete'),
    );

    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: SpellingListScreen(api: mockStore),
      ),
    );
    await tester.pumpAndSettle();

    // Tap delete button for apple
    await tester.tap(find.byKey(const Key('spelling-word-delete-apple')));
    await tester.pumpAndSettle();

    // Tap Delete inside dialog
    await tester.tap(find.byKey(const Key('spelling-word-delete-confirm-button')));
    await tester.pumpAndSettle();

    // Dialog is gone
    expect(find.byKey(const Key('spelling-word-delete-confirm-dialog')), findsNothing);

    // Store was called
    expect(mockStore.deleteCount, 1);

    // List is NOT updated, apple is still there
    expect(find.text('apple'), findsOneWidget);
    expect(find.text('banana'), findsOneWidget);

    // Error snackbar is shown
    expect(find.text('Could not delete word.'), findsOneWidget);
  });
}