import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:metatron_student_erp/features/timetable/timetable_screen.dart';
import 'package:metatron_student_erp/models/student.dart';
import 'package:metatron_student_erp/models/timetable.dart';
import 'package:metatron_student_erp/providers/timetable_provider.dart';

void main() {
  final sampleSlots = [
    const TimetableSlot(
      id: 101,
      date: '2026-10-13',
      day: 'Tuesday',
      startTime: '09:00 AM',
      endTime: '10:30 AM',
      subject: NamedRecord(id: 4, name: 'Database Systems'),
      faculty: NamedRecord(id: 6, name: 'Dr. Turing'),
      room: NamedRecord(id: 1, name: 'Lecture Hall 101'),
    ),
    const TimetableSlot(
      id: 102,
      date: '2026-10-13',
      day: 'Tuesday',
      startTime: '11:00 AM',
      endTime: '12:30 PM',
      subject: NamedRecord(id: 5, name: 'Operating Systems'),
      faculty: NamedRecord(id: 6, name: 'Dr. Turing'),
      room: NamedRecord(id: 2, name: 'Lecture Hall 102'),
    ),
  ];

  Widget buildTestableScreen(List<Override> overrides) {
    return ProviderScope(
      overrides: overrides,
      child: const MaterialApp(
        home: TimetableScreen(),
      ),
    );
  }

  testWidgets('TimetableScreen renders loading state initially', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        timetableProvider.overrideWith((ref) => Future.delayed(
              const Duration(seconds: 1),
              () => sampleSlots,
            )),
      ]),
    );

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    await tester.pumpAndSettle();
  });

  testWidgets('TimetableScreen renders empty state when no slots exist', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        timetableProvider.overrideWith((ref) => Future.value([])),
      ]),
    );
    await tester.pumpAndSettle();

    expect(find.text('Weekly Timetable'), findsOneWidget);
    expect(find.text('No timetable slots scheduled'), findsOneWidget);
    expect(find.text('Your class schedule has not been published yet.'), findsOneWidget);
  });

  testWidgets('TimetableScreen renders slot cards and day groups with live data', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        timetableProvider.overrideWith((ref) => Future.value(sampleSlots)),
      ]),
    );
    await tester.pumpAndSettle();

    expect(find.text('Weekly Timetable'), findsOneWidget);
    expect(find.text('TUESDAY'), findsOneWidget);
    expect(find.text('Database Systems'), findsOneWidget);
    expect(find.text('Lecture Hall 101'), findsOneWidget);
    expect(find.text('Operating Systems'), findsOneWidget);
    expect(find.text('Lecture Hall 102'), findsOneWidget);
    expect(find.text('09:00 AM'), findsOneWidget);
    expect(find.text('10:30 AM'), findsOneWidget);
    expect(find.text('11:00 AM'), findsOneWidget);
    expect(find.text('12:30 PM'), findsOneWidget);
  });

  testWidgets('TimetableScreen renders error state and retry button on failure', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        timetableProvider.overrideWith((ref) => Future.error(Exception('Network timeout'))),
      ]),
    );
    await tester.pumpAndSettle();

    expect(find.text('Failed to load timetable'), findsOneWidget);
    expect(find.text('Retry'), findsOneWidget);
    expect(find.byIcon(Icons.error_outline_rounded), findsOneWidget);
  });
}