import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:kouyu_english/core/app_state.dart';
import 'package:kouyu_english/features/dialogue/dialogue_flow.dart';
import 'package:kouyu_english/features/onboarding/onboarding_pages.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  setUp(() {
    SharedPreferences.setMockInitialValues({});
  });

  testWidgets('three-question placement suggests a starting lesson', (
    tester,
  ) async {
    final state = AppState();
    var started = false;
    await tester.pumpWidget(
      MaterialApp(
        home: PlacementPage(state: state, onStart: () => started = true),
      ),
    );

    await tester.tap(find.text('开始 3 分钟定位'));
    await tester.pumpAndSettle();
    expect(find.text('定位 · 1 / 3'), findsOneWidget);
    await tester.tap(find.text('你好，我叫 Mia，很高兴认识你。'));
    await tester.pump();
    await tester.tap(find.text('下一题'));
    await tester.pumpAndSettle();

    expect(find.text('定位 · 2 / 3'), findsOneWidget);
    await tester.tap(find.text('现在不方便开口，跳过'));
    await tester.pumpAndSettle();

    expect(find.text('定位 · 3 / 3'), findsOneWidget);
    await tester.enterText(find.byType(TextField), 'My name is Mia.');
    await tester.tap(find.text('查看建议'));
    await tester.pumpAndSettle();

    expect(find.text('建议从 A0 第 2 课开始'), findsOneWidget);
    expect(find.text('从更简单内容开始'), findsOneWidget);
    await tester.tap(find.text('开始今天学习'));
    await tester.pump();

    expect(started, isTrue);
    expect(state.activeLessonId, 'a0-02');
    expect(state.placementStartLessonId, 'a0-02');
    expect(state.completedLessonIds, isEmpty);
  });

  testWidgets('an unanswered placement starts from lesson one', (tester) async {
    final state = AppState();
    await tester.pumpWidget(
      MaterialApp(
        home: PlacementPage(state: state, onStart: () {}),
      ),
    );

    await tester.tap(find.text('开始 3 分钟定位'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('听不懂，下一题'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('我读完了'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('还不会说，查看建议'));
    await tester.pumpAndSettle();

    expect(find.text('建议从 A0 第 1 课开始'), findsOneWidget);
    expect(find.text('从更简单内容开始'), findsNothing);
  });

  testWidgets('scene page lists open and locked scenes', (tester) async {
    final state = AppState()
      ..completedLessonIds.addAll(['a0-01', 'a0-02', 'a0-03', 'a0-04']);
    String? startedScene;
    await tester.pumpWidget(
      MaterialApp(
        home: DialogueScenePage(
          state: state,
          onStart: (id) => startedScene = id,
        ),
      ),
    );

    expect(find.text('初次见面'), findsOneWidget);
    expect(find.text('留个电话'), findsOneWidget);
    expect(find.text('A0 · 学完第 7 课后开放'), findsOneWidget);
    await tester.tap(find.widgetWithText(FilledButton, '开始对话').first);
    expect(startedScene, isNotNull);
  });
}