import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:student_app/data/repositories/curriculum_question_bank.dart';
import 'package:student_app/presentation/screens/curriculum/lesson_homework_sheet.dart';
import 'package:student_app/presentation/screens/exams/adaptive_exam_screen.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('CurriculumQuestionBank Subject Isolation & Decoupling', () {
    test('Islamic Studies question bank contains ZERO math equations', () {
      final exam = CurriculumQuestionBank.getUnitExam(
        subjectId: 'islamic_10',
        unitKey: 'unit_01',
      );

      expect(exam.title, contains('القرآن الكريم'));
      expect(exam.questions.isNotEmpty, isTrue);

      for (final q in exam.questions) {
        // Assert zero math contamination
        expect(q.questionText.contains('x²'), isFalse, reason: 'Math leaked into Islamic exam: ${q.questionText}');
        expect(q.questionText.contains('معادلة'), isFalse, reason: 'Math leaked into Islamic exam: ${q.questionText}');
        expect(q.questionText.contains('مشتق'), isFalse, reason: 'Calculus leaked into Islamic exam: ${q.questionText}');
        // Assert Islamic topic relevance
        expect(
          q.topicTag.contains('قرآن') ||
              q.topicTag.contains('بيع') ||
              q.topicTag.contains('معاملات') ||
              q.topicTag.contains('فقه') ||
              q.topicTag.contains('سيرة') ||
              q.topicTag.contains('إسلام') ||
              q.topicTag.contains('حديث') ||
              q.topicTag.contains('آداب'),
          isTrue,
          reason: 'Non-Islamic topic tag in Islamic exam: ${q.topicTag}',
        );
      }
    });

    test('Physics question bank contains authentic physics concepts', () {
      final examU1 = CurriculumQuestionBank.getUnitExam(
        subjectId: 'physics_10',
        unitKey: 'unit_01',
      );
      expect(examU1.title, contains('المتجهات'));
      expect(examU1.questions.any((q) => q.questionText.contains('متجه')), isTrue);

      final examU2 = CurriculumQuestionBank.getUnitExam(
        subjectId: 'physics_10',
        unitKey: 'unit_02',
      );
      expect(examU2.title, contains('المقذوفات'));
      expect(examU2.questions.any((q) => q.questionText.contains('أقصى ارتفاع')), isTrue);
    });

    test('Arabic question bank contains authentic grammar and literature', () {
      final exam = CurriculumQuestionBank.getUnitExam(
        subjectId: 'arabic_10',
        unitKey: 'unit_01',
      );
      expect(exam.title, contains('الشرط'));
      expect(exam.questions.any((q) => q.topicTag.contains('الشرط')), isTrue);
    });

    test('Lesson homework returns 3 focused questions with explanations', () {
      final hw = CurriculumQuestionBank.getLessonHomework(
        subjectId: 'islamic_10',
        lessonId: 'lesson_01',
        lessonTitle: 'واجب المسلم تجاه القرآن الكريم',
      );

      expect(hw.questions.length, greaterThanOrEqualTo(3));
      for (final q in hw.questions) {
        expect(q.questionText.isNotEmpty, isTrue);
        expect(q.options.length, 4);
        expect(q.explanation.isNotEmpty, isTrue);
        expect(q.correctIndex >= 0 && q.correctIndex < 4, isTrue);
      }
    });

    test('Subject worksheets are populated and isolated per subject', () {
      final islamicSheets = CurriculumQuestionBank.getSubjectWorksheets(
        subjectId: 'islamic_10',
        subjectTitle: 'التربية الإسلامية',
      );
      expect(islamicSheets.isNotEmpty, isTrue);
      expect(islamicSheets.any((s) => s.title.contains('القرآن')), isTrue);

      final physicsSheets = CurriculumQuestionBank.getSubjectWorksheets(
        subjectId: 'physics_10',
        subjectTitle: 'الفيزياء',
      );
      expect(physicsSheets.isNotEmpty, isTrue);
      expect(physicsSheets.any((s) => s.title.contains('المتجهات')), isTrue);
    });
  });

  group('LessonHomeworkSheet UI Test', () {
    testWidgets('renders homework questions and verifies answer', (tester) async {
      await tester.pumpWidget(
        const MaterialApp(
          home: Scaffold(
            body: LessonHomeworkSheet(
              subjectId: 'islamic_10',
              subjectTitle: 'التربية الإسلامية',
              lessonId: 'lesson_01',
              lessonTitle: 'واجب المسلم تجاه القرآن الكريم',
            ),
          ),
        ),
      );

      await tester.pumpAndSettle();

      expect(find.textContaining('واجب الدرس'), findsOneWidget);
      expect(find.textContaining('التمرين 1'), findsOneWidget);
      expect(find.text('تحقق من الإجابة 🚀'), findsOneWidget);

      // Tap first option
      await tester.tap(find.textContaining('استحباب تلاوة القرآن'));
      await tester.pumpAndSettle();

      // Tap check answer
      await tester.tap(find.text('تحقق من الإجابة 🚀'));
      await tester.pumpAndSettle();

      // Check explanation shows up
      expect(find.textContaining('الشرح التوضيحي'), findsOneWidget);
    });
  });

  group('AdaptiveExamScreen Subject Decoupling UI Test', () {
    testWidgets('opening Islamic exam does NOT show math equations', (tester) async {
      final initialExam = CurriculumQuestionBank.getUnitExam(
        subjectId: 'islamic_10',
        unitKey: 'unit_01',
      );

      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: AdaptiveExamScreen(
              examId: 9999,
              title: 'اختبار الفهم التكيفي: القرآن الكريم',
              subjectTitle: 'التربية الإسلامية',
              subjectCode: 'islamic_10',
              unitKey: 'unit_01',
              initialExam: initialExam,
            ),
          ),
        ),
      );

      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));

      // Verify header
      expect(find.text('التربية الإسلامية'), findsOneWidget);
      expect(find.text('اختبار الفهم التكيفي: القرآن الكريم'), findsOneWidget);

      // Verify that math equations never appear
      expect(find.textContaining('x³'), findsNothing);
      expect(find.textContaining('معادلة تربيعية'), findsNothing);

      // Unmount to cancel BlocProvider and ExamCubit countdown timer cleanly
      await tester.pumpWidget(const SizedBox());
    });
  });
}