import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:intaleq_maps/intaleq_maps.dart';
import '../services/offline_routing_engine.dart';
import '../services/tactical_api_service.dart';
import '../services/turn_by_turn_navigation_engine.dart';

/// ============================================================================
/// [NavigationController] - وحدة التحكم بالملاحة وتوجيه القوافل التكتيكية
/// ============================================================================
/// English:
/// GetX Controller managing hybrid tactical convoy routing (Online API + Sovereign
/// Offline Engine fallback), active turn-by-turn guidance, and navigation metrics.
///
/// العربية:
/// متحكم GetX لإدارة توجيه القوافل والآليات العسكرية (هجين: سيرفر أونلاين + محرك أوفلاين محلي)،
/// وتتبع مسار الملاحة خطوة بخطوة وحساب السرعة والوقت المتبقي للهدف.
/// ============================================================================
class NavigationController extends GetxController {
  // ── Observables / الحالات التفاعلية ──────────────────────────────────────
  final Rx<OfflineRoutePlan?> activeRoute = Rx<OfflineRoutePlan?>(null);
  final Rx<TacticalVehicleProfile> vehicleProfile =
      Rx<TacticalVehicleProfile>(TacticalVehicleProfile.convoy);
  final RxBool isCalculating = false.obs;

  /// Calculate Hybrid Tactical Route / احتساب مسار تكتيكي هجين (سيرفر + محلي)
  Future<OfflineRoutePlan?> calculateRoute({
    required LatLng origin,
    required LatLng destination,
    TacticalVehicleProfile? profile,
    bool autoStart = false,
    IntaleqMapController? mapController,
  }) async {
    final activeProfile = profile ?? vehicleProfile.value;
    vehicleProfile.value = activeProfile;
    isCalculating.value = true;

    OfflineRoutePlan? plan;

    // 1. Try Online NestJS Server Routing API
    try {
      final serverRoute = await TacticalApiService.calculateTacticalRoute(
        origin: origin,
        destination: destination,
        profile: activeProfile.name,
      );

      if (serverRoute != null && serverRoute.points.isNotEmpty) {
        plan = OfflineRoutePlan(
          polylinePoints: serverRoute.points,
          totalDistanceKm: serverRoute.distanceKm,
          estimatedDurationMinutes: serverRoute.durationMinutes,
          profile: activeProfile,
          tacticalWaypoints: const ['موقع الانطلاق', 'الهدف التكتيكي المحدد'],
          isOffline: false,
        );
      }
    } catch (e) {
      debugPrint('Online route fallback: $e');
    }

    // 2. Fallback to 100% Sovereign On-Device Offline Routing Engine
    plan ??= OfflineRoutingEngine.calculateOnDeviceRoute(
      start: origin,
      destination: destination,
      profile: activeProfile,
    );

    activeRoute.value = plan;
    isCalculating.value = false;

    if (autoStart) {
      startNavigation(mapController: mapController);
    }

    return plan;
  }

  /// Start Active Turn-by-Turn Guidance / بدء الإرشاد الملاحي الحي
  void startNavigation({IntaleqMapController? mapController}) {
    if (activeRoute.value == null) return;
    TurnByTurnNavigationEngine.startNavigation(
      plan: activeRoute.value!,
      simulate: false,
      controller: mapController,
    );
  }

  /// Stop Navigation / إنهاء الملاحة
  void stopNavigation() {
    TurnByTurnNavigationEngine.stopNavigation();
  }

  /// Reset Route State / إعادة ضبط المسار
  void reset() {
    stopNavigation();
    activeRoute.value = null;
  }
}