import 'road_alert_models.dart';
import 'road_alert_provider_interface.dart';

class LocalRoadAlertProvider implements RoadAlertProvider {
  @override
  String get id => 'local_demo';

  @override
  String get name => 'Demo / Local Alerts';

  @override
  Set<RoadAlertCategory> get supportedCategories => const {
        RoadAlertCategory.police,
        RoadAlertCategory.speedCamera,
        RoadAlertCategory.accident,
        RoadAlertCategory.hazard,
        RoadAlertCategory.roadClosure,
        RoadAlertCategory.construction,
        RoadAlertCategory.traffic,
        RoadAlertCategory.other,
      };

  @override
  Future<RoadAlertProviderStatus> testConnection(String apiKey) async {
    return RoadAlertProviderStatus.connected;
  }

  @override
  Future<List<RoadAlert>> getAlerts({
    required double latitude,
    required double longitude,
    required double radiusMeters,
    String? apiKey,
  }) async {
    // Generate simulated road alerts within 200m-800m of the user for offline demo
    final now = DateTime.now();

    return [
      RoadAlert(
        id: 'demo_hazard_1',
        providerId: id,
        category: RoadAlertCategory.hazard,
        latitude: latitude + 0.0025,
        longitude: longitude + 0.0018,
        roadName: 'Main Highway / Curve 4',
        description: 'Debris reported in right lane',
        reportedAt: now.subtract(const Duration(minutes: 10)),
        expiresAt: now.add(const Duration(minutes: 50)),
        lastUpdated: now,
        confidence: 0.9,
        severity: RoadAlertSeverity.medium,
        source: 'Demo Local Provider',
        sourceType: RoadAlertSourceType.userReported,
      ),
      RoadAlert(
        id: 'demo_construction_1',
        providerId: id,
        category: RoadAlertCategory.construction,
        latitude: latitude - 0.0031,
        longitude: longitude - 0.0022,
        roadName: 'Valley Expressway',
        description: 'Roadwork & lane closure ahead',
        reportedAt: now.subtract(const Duration(minutes: 30)),
        expiresAt: now.add(const Duration(hours: 2)),
        lastUpdated: now,
        confidence: 0.95,
        severity: RoadAlertSeverity.high,
        source: 'Demo Local Provider',
        sourceType: RoadAlertSourceType.providerReported,
      ),
      RoadAlert(
        id: 'demo_police_1',
        providerId: id,
        category: RoadAlertCategory.police,
        latitude: latitude + 0.0042,
        longitude: longitude - 0.0015,
        roadName: 'State Route 9',
        description: 'Police reported on shoulder',
        reportedAt: now.subtract(const Duration(minutes: 5)),
        expiresAt: now.add(const Duration(minutes: 25)),
        lastUpdated: now,
        confidence: 0.75,
        severity: RoadAlertSeverity.medium,
        source: 'Demo Community Report',
        sourceType: RoadAlertSourceType.userReported,
      ),
    ];
  }
}