import 'road_alert_models.dart';

/// Regional regulatory compliance status for speed cameras and enforcement traps.
enum AlertComplianceJurisdiction {
  /// Exact distance countdown, camera type, and mobile speed trap locations (e.g. United States, UK).
  standard,

  /// French "Zone de Danger" regulatory compliance (Art. R413-15 Code de la route).
  /// Exact camera pinpoints are prohibited and transformed into general Danger Zone corridor advisories.
  frenchDangerZone,

  /// Jurisdictions where speed camera warning devices and software are strictly prohibited
  /// while driving (e.g. Germany § 23 Abs. 1c StVO, Switzerland Art. 57b SVG).
  /// Camera and radar trap alerts must be suppressed.
  prohibited,
}

/// Evaluates and enforces regional compliance rules on road alerts.
class RoadAlertCompliance {
  /// Evaluates regional regulatory compliance based on rider GPS coordinates.
  static AlertComplianceJurisdiction evaluateJurisdiction(double lat, double lng) {
    // Switzerland: Lat [45.81, 47.81], Lng [5.95, 10.49]
    if (lat >= 45.81 && lat <= 47.81 && lng >= 5.95 && lng <= 10.49) {
      return AlertComplianceJurisdiction.prohibited;
    }

    // Germany: Lat [47.27, 55.06], Lng [5.86, 15.04]
    if (lat >= 47.27 && lat <= 55.06 && lng >= 5.86 && lng <= 15.04) {
      return AlertComplianceJurisdiction.prohibited;
    }

    // France: Lat [41.33, 51.09], Lng [-5.14, 9.56]
    // Exclude Switzerland/Germany overlap
    if (lat >= 41.33 && lat <= 51.09 && lng >= -5.14 && lng <= 9.56) {
      return AlertComplianceJurisdiction.frenchDangerZone;
    }

    // Default: United States (all 50 states + DC) and other standard jurisdictions
    return AlertComplianceJurisdiction.standard;
  }

  /// Filters or transforms alerts to satisfy jurisdictional requirements.
  static List<RoadAlert> applyCompliance(
    List<RoadAlert> alerts, {
    required double userLat,
    required double userLng,
    bool complianceEnabled = true,
  }) {
    if (!complianceEnabled) return List<RoadAlert>.from(alerts);

    final jurisdiction = evaluateJurisdiction(userLat, userLng);
    switch (jurisdiction) {
      case AlertComplianceJurisdiction.prohibited:
        // Suppress stationary speed cameras and mobile speed enforcement in Germany & Switzerland
        return alerts.where((alert) {
          if (alert.category == RoadAlertCategory.speedCamera) return false;
          if (alert.category == RoadAlertCategory.police) {
            final desc = alert.description.toLowerCase();
            if (desc.contains('speed') || desc.contains('radar') || desc.contains('trap')) {
              return false;
            }
          }
          return true;
        }).toList();

      case AlertComplianceJurisdiction.frenchDangerZone:
        // Transform exact speed cameras into "Zone de Danger" corridor advisories
        return alerts.map((alert) {
          if (alert.category == RoadAlertCategory.speedCamera) {
            return alert.copyWith(
              category: RoadAlertCategory.hazard,
              description: 'Zone de Danger — Section Sécurité Routière',
              severity: RoadAlertSeverity.medium,
            );
          }
          return alert;
        }).toList();

      case AlertComplianceJurisdiction.standard:
        // United States standard: 100% full fidelity exact camera & mobile police alerts
        return List<RoadAlert>.from(alerts);
    }
  }
}