import 'package:bible_tracker/services/last_location.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('LastLocation.tryParseRoute', () {
    test('parses tracker-only route', () {
      final parsed = LastLocation.tryParseRoute('/tracker/abc');
      expect(parsed, const LastLocation(trackerId: 'abc'));
    });

    test('parses tracker + book route', () {
      final parsed = LastLocation.tryParseRoute('/tracker/abc/book/12');
      expect(parsed, const LastLocation(trackerId: 'abc', bookIndex: 12));
    });

    test('returns null for unrelated routes', () {
      expect(LastLocation.tryParseRoute(null), isNull);
      expect(LastLocation.tryParseRoute('/'), isNull);
      expect(LastLocation.tryParseRoute('/settings'), isNull);
      expect(LastLocation.tryParseRoute('/tracker'), isNull);
      expect(
        LastLocation.tryParseRoute('/tracker/abc/book/not-a-number'),
        isNull,
      );
    });

    test('toRouteName round-trips', () {
      const a = LastLocation(trackerId: 'abc');
      const b = LastLocation(trackerId: 'abc', bookIndex: 0);
      expect(LastLocation.tryParseRoute(a.toRouteName()), a);
      expect(LastLocation.tryParseRoute(b.toRouteName()), b);
    });
  });

  group('LastLocationService', () {
    test('returns null when nothing is persisted', () async {
      SharedPreferences.setMockInitialValues(<String, Object>{});
      final prefs = await SharedPreferences.getInstance();
      final service = LastLocationService(prefs);
      expect(service.load(), isNull);
    });

    test('round-trips a location through SharedPreferences', () async {
      SharedPreferences.setMockInitialValues(<String, Object>{});
      final prefs = await SharedPreferences.getInstance();
      final service = LastLocationService(prefs);

      const location = LastLocation(trackerId: 't1', bookIndex: 7);
      await service.save(location);
      expect(service.load(), location);

      await service.save(null);
      expect(service.load(), isNull);
    });

    test('load returns null when stored JSON is corrupt', () async {
      SharedPreferences.setMockInitialValues(<String, Object>{
        'bible_tracker.last_location.v1': 'not-json',
      });
      final prefs = await SharedPreferences.getInstance();
      final service = LastLocationService(prefs);
      expect(service.load(), isNull);
    });
  });
}