import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:get/get.dart';
import 'package:intaleq_maps/intaleq_maps.dart';

import '../models/angle_unit.dart';
import '../models/navigation_state.dart';
import '../services/military_grid_utils.dart';
import '../services/offline_los_engine.dart';
import '../widgets/interactive_map_picker_hud.dart';
import 'artillery_controller.dart';
import 'hlz_controller.dart';
import 'isochrone_controller.dart';
import 'los_controller.dart';
import 'minefield_controller.dart';
import 'navigation_controller.dart';
import 'overlays_controller.dart';
import 'resection_controller.dart';
import 'symbols_controller.dart';
import 'viewshed_controller.dart';

/// ============================================================================
/// [TacticalMapController] - المحرك الرئيسي لمنظومة الخريطة والعمليات الميدانية
/// ============================================================================
/// English:
/// Master GetX Controller orchestrating tactical modes, map camera state,
/// declarative layers (Markers, Polylines, Polygons), and crosshair picker HUDs.
///
/// العربية:
/// المتحكم المركزي لمنظومة العمليات التكتيكية، يربط بين مختلف المتحكمات الفرعية
/// (المدفعية، المهابط، الألغام، الشفافات، الرموز) وينظم طبقات الخريطة والمؤشر التفاعلي.
/// ============================================================================
class TacticalMapController extends GetxController {
  // ── Sub-Controllers / المتحكمات الفرعية ──────────────────────────────────
  final ArtilleryController artillery = Get.find<ArtilleryController>();
  final HlzController hlz = Get.find<HlzController>();
  final MinefieldController minefield = Get.find<MinefieldController>();
  final IsochroneController isochrone = Get.find<IsochroneController>();
  final SymbolsController symbols = Get.find<SymbolsController>();
  final OverlaysController overlays = Get.find<OverlaysController>();
  final LosController los = Get.find<LosController>();
  final ViewshedController viewshed = Get.find<ViewshedController>();
  final ResectionController resection = Get.find<ResectionController>();
  final NavigationController navigation = Get.find<NavigationController>();

  // ── Observables / الحالات التفاعلية ──────────────────────────────────────
  final RxString currentTacticalMode = 'nav'.obs;
  final Rx<AngleUnit> angleUnit = AngleUnit.dual.obs;
  final RxBool showContours = true.obs;
  final Rx<LatLng?> currentGpsPosition = Rx<LatLng?>(null);
  final Rx<LatLng> currentCameraCenter = const LatLng(31.9539, 35.9106).obs;
  final Rx<MapPickerTarget?> activePickerTarget = Rx<MapPickerTarget?>(null);

  IntaleqMapController? mapController;

  @override
  void onInit() {
    super.onInit();
    initGps();
  }

  /// Initialize Live GPS Sensor / تهيئة حساس الموقع الجغرافي
  Future<void> initGps() async {
    try {
      final serviceEnabled = await Geolocator.isLocationServiceEnabled();
      if (!serviceEnabled) return;

      LocationPermission perm = await Geolocator.checkPermission();
      if (perm == LocationPermission.denied) {
        perm = await Geolocator.requestPermission();
      }
      if (perm == LocationPermission.whileInUse || perm == LocationPermission.always) {
        final pos = await Geolocator.getCurrentPosition(
          locationSettings: const LocationSettings(
            accuracy: LocationAccuracy.high,
            timeLimit: Duration(seconds: 5),
          ),
        );
        currentGpsPosition.value = LatLng(pos.latitude, pos.longitude);
        currentCameraCenter.value = currentGpsPosition.value!;
        mapController?.animateCamera(
          CameraUpdate.newLatLngZoom(currentGpsPosition.value!, 14.0),
        );
      }
    } catch (e) {
      debugPrint('GPS init error: $e');
    }
  }

  /// Switch Tactical Operation Mode / تبديل نمط العملية التكتيكية
  void switchMode(String mode) {
    currentTacticalMode.value = mode;
  }

  /// Set Angle Unit Format / تبديل نظام قياس الزوايا والسمت (درجات / ميل)
  void setAngleUnit(AngleUnit unit) {
    angleUnit.value = unit;
  }

  /// Toggle Topographic Contours / إظهار أو إخفاء خطوط الكنتور
  void toggleContours(bool visible) {
    showContours.value = visible;
  }

  /// Set Active Picker Target / تفعيل المؤشر التفاعلي لاختيار نقطة على الخريطة
  void setPickerTarget(MapPickerTarget? target) {
    activePickerTarget.value = target;
  }

  /// Handle Map Click Tap Events / معالجة النقر على الخريطة
  void handleMapTap(LatLng point) {
    // 1. Check if placing a tactical symbol
    if (symbols.activePlacementType.value != null) {
      symbols.placeSymbolAt(point);
      Get.snackbar(
        'الرموز العسكرية',
        'تم تثبيت الرمز في الميدان بنجاح ✅',
        backgroundColor: const Color(0xFF22C55E),
        colorText: Colors.white,
        snackPosition: SnackPosition.BOTTOM,
      );
      return;
    }

    // 2. Check if active picker HUD is open
    if (activePickerTarget.value != null) {
      confirmPicker(activePickerTarget.value!, point);
      return;
    }

    // 3. Mode-specific quick tap handlers
    switch (currentTacticalMode.value) {
      case 'viewshed_360':
        viewshed.setObserver(point);
        break;
      case 'artillery':
        if (artillery.gunPosition.value == null) {
          artillery.setGunPosition(point);
        } else {
          artillery.setTargetPosition(point);
        }
        break;
      case 'hlz':
        hlz.setPosition(point);
        break;
      case 'minefield':
        if (minefield.startPoint.value == null) {
          minefield.setStartPoint(point);
        } else {
          minefield.setEndPoint(point);
        }
        break;
      case 'isochrone':
        isochrone.setCenter(point);
        break;
      case 'los':
        if (los.observerPosition.value == null) {
          los.setObserver(point);
        } else {
          los.setTarget(point);
        }
        break;
      default:
        final mil = MilitaryGridUtils.fromLatLng(point);
        final elev = JordanDemSurface.elevationAt(point.latitude, point.longitude);
        Get.snackbar(
          'الإحداثيات العسكرية',
          '${mil.arabicFullFormat} • منسوب: ${elev.round()}م',
          backgroundColor: const Color(0xFF0F172A),
          colorText: Colors.white,
          snackPosition: SnackPosition.BOTTOM,
          duration: const Duration(seconds: 3),
        );
        break;
    }
  }

  /// Confirm Point Selection from Crosshair HUD / تأكيد النقطة المحددة بالمؤشر
  void confirmPicker(MapPickerTarget target, LatLng pos) {
    activePickerTarget.value = null;
    switch (target) {
      case MapPickerTarget.losObserver:
        los.setObserver(pos);
        break;
      case MapPickerTarget.losTarget:
        los.setTarget(pos);
        break;
      case MapPickerTarget.viewshedCenter:
        viewshed.setObserver(pos);
        break;
      case MapPickerTarget.artilleryGun:
        artillery.setGunPosition(pos);
        break;
      case MapPickerTarget.artilleryTarget:
        artillery.setTargetPosition(pos);
        break;
      case MapPickerTarget.hlzCenter:
        hlz.setPosition(pos);
        break;
      case MapPickerTarget.minefieldStart:
        minefield.setStartPoint(pos);
        break;
      case MapPickerTarget.minefieldEnd:
        minefield.setEndPoint(pos);
        break;
      case MapPickerTarget.isochroneCenter:
        isochrone.setCenter(pos);
        break;
      case MapPickerTarget.routeOrigin:
      case MapPickerTarget.routeDestination:
        break;
    }
  }

  /// Cancel Picker / إلغاء وضع المؤشر
  void cancelPicker() {
    activePickerTarget.value = null;
  }

  /// Fit Map Camera to Bounding Box of Points / تحريك الكاميرا لتحتوي النقاط
  void fitBounds(List<LatLng> points) {
    if (points.isEmpty || mapController == null) return;

    double minLat = points.first.latitude;
    double maxLat = points.first.latitude;
    double minLng = points.first.longitude;
    double maxLng = points.first.longitude;

    for (final p in points) {
      if (p.latitude < minLat) minLat = p.latitude;
      if (p.latitude > maxLat) maxLat = p.latitude;
      if (p.longitude < minLng) minLng = p.longitude;
      if (p.longitude > maxLng) maxLng = p.longitude;
    }

    final bounds = LatLngBounds(
      southwest: LatLng(minLat, minLng),
      northeast: LatLng(maxLat, maxLng),
    );

    mapController?.animateCamera(
      CameraUpdate.newLatLngBounds(
        bounds,
        left: 40.0,
        top: 60.0,
        right: 40.0,
        bottom: 120.0,
      ),
    );
  }

  /// Get Mode Title / الحصول على عنوان النمط الميداني الحالي
  String getModeTitle() {
    switch (currentTacticalMode.value) {
      case 'los':
        return 'تبادل الرؤية والمراقبة (LOS)';
      case 'viewshed_360':
        return 'رادار الرصد الدائري 360°';
      case 'artillery':
        return 'رماية المدفعية وقوس القذيفة';
      case 'hlz':
        return 'مهابط المروحيات (HLZ)';
      case 'minefield':
        return 'حقول الألغام وممرات العبور';
      case 'isochrone':
        return 'نطاق التدخل السريع (QRF)';
      case 'symbols':
        return 'الرموز والتشكيلات العسكرية';
      case 'overlays':
        return 'منظومة الشفافات (IPB)';
      case 'routing':
        return 'توجيه القوافل التكتيكي';
      default:
        return 'منظومة العمليات الميدانية (Off-Grid)';
    }
  }

  /// Build all declarative map markers / تجميع كافة علامات الخريطة
  Set<Marker> buildMarkers(ActiveNavigationState navState) {
    final markers = <Marker>{};

    // 1. Landmark & Observation Markers
    for (final obs in resection.observations) {
      markers.add(
        Marker(
          markerId: MarkerId(obs.landmark.id),
          position: LatLng(obs.landmark.lat, obs.landmark.lng),
          icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueAzure),
          infoWindow: InfoWindow(
            title: obs.landmark.name,
            snippet: AngleFormatter.format(obs.trueAzimuthDeg, angleUnit.value),
          ),
        ),
      );
    }

    // 2. Resection Fix Marker
    if (resection.resectionResult.value != null && !navState.isNavigating) {
      final res = resection.resectionResult.value!;
      markers.add(
        Marker(
          markerId: const MarkerId('observer_calculated_position'),
          position: LatLng(res.lat, res.lng),
          icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueGreen),
          infoWindow: const InfoWindow(
            title: 'موقع الراصد المحسوب (GPS-Denied Fix)',
            snippet: 'تم استخراج الموقع بالتقاطع البصري العكسي',
          ),
        ),
      );
    }

    // 3. Routing Destination Marker
    if (navigation.activeRoute.value != null &&
        navigation.activeRoute.value!.polylinePoints.isNotEmpty) {
      markers.add(
        Marker(
          markerId: const MarkerId('convoy_destination'),
          position: navigation.activeRoute.value!.polylinePoints.last,
          icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueRed),
          infoWindow: const InfoWindow(
            title: 'الهدف التكتيكي (Objective)',
            snippet: 'نقطة الوصول المحددة',
          ),
        ),
      );
    }

    // 4. Moving Vehicle Marker
    if (navState.isNavigating && navState.currentPosition != null) {
      markers.add(
        Marker(
          markerId: const MarkerId('active_vehicle_position'),
          position: navState.currentPosition!,
          icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueCyan),
          infoWindow: InfoWindow(
            title: 'مركبة العمليات الميدانية',
            snippet:
                '${navState.currentSpeedKmH.round()} كم/س • سمت ${navState.currentHeadingDeg.round()}°',
          ),
        ),
      );
    }

    // 5. Tactical Placed Symbols
    for (final sym in symbols.placedSymbols) {
      markers.add(
        Marker(
          markerId: MarkerId(sym.id),
          position: sym.position,
          icon: InlqBitmap.defaultMarkerWithHue(
            sym.isEnemy ? InlqBitmap.hueRed : InlqBitmap.hueBlue,
          ),
          infoWindow: InfoWindow(
            title: sym.name,
            snippet: MilitaryGridUtils.latLngToMgrs(
                sym.position.latitude, sym.position.longitude),
          ),
        ),
      );
    }

    // 6. Artillery Gun & Target Markers
    if (currentTacticalMode.value == 'artillery') {
      if (artillery.gunPosition.value != null) {
        markers.add(
          Marker(
            markerId: const MarkerId('artillery_gun_marker'),
            position: artillery.gunPosition.value!,
            icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueBlue),
            infoWindow: const InfoWindow(title: '🎯 مربض المدفعية'),
          ),
        );
      }
      if (artillery.targetPosition.value != null) {
        markers.add(
          Marker(
            markerId: const MarkerId('artillery_target_marker'),
            position: artillery.targetPosition.value!,
            icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueRed),
            infoWindow: const InfoWindow(title: '💥 الهدف المعادي'),
          ),
        );
      }
    }

    // 7. HLZ Center Marker
    if (currentTacticalMode.value == 'hlz' && hlz.selectedPosition.value != null) {
      markers.add(
        Marker(
          markerId: const MarkerId('hlz_center_marker'),
          position: hlz.selectedPosition.value!,
          icon: InlqBitmap.defaultMarkerWithHue(InlqBitmap.hueGreen),
          infoWindow: const InfoWindow(title: '🚁 مهبط الطيران العامودي (HLZ)'),
        ),
      );
    }

    return markers;
  }

  /// Build all declarative map polylines / تجميع مسارات الخريطة
  Set<Polyline> buildPolylines(ActiveNavigationState navState) {
    final polylines = <Polyline>{};

    // 1. Tactical Line of Sight (LOS)
    if (currentTacticalMode.value == 'los' &&
        los.observerPosition.value != null &&
        los.targetPosition.value != null &&
        los.losReport.value != null &&
        los.losReport.value!.profile.length > 1) {
      final visSegments = los.losReport.value!.visibleSegments;
      for (int i = 0; i < visSegments.length; i++) {
        polylines.add(
          Polyline(
            polylineId: PolylineId('tactical_los_vis_$i'),
            points: visSegments[i],
            color: const Color(0xFF22C55E),
            width: 5.0,
          ),
        );
      }

      final blkSegments = los.losReport.value!.blockedSegments;
      for (int i = 0; i < blkSegments.length; i++) {
        polylines.add(
          Polyline(
            polylineId: PolylineId('tactical_los_blk_$i'),
            points: blkSegments[i],
            color: const Color(0xFFEF4444),
            width: 5.0,
          ),
        );
      }
    }

    // 2. Artillery Ballistic Arc Ground Track
    if (currentTacticalMode.value == 'artillery' &&
        artillery.firingSolution.value != null) {
      final points = artillery.firingSolution.value!.trajectoryProfile
          .map((p) => p.coordinate)
          .toList();
      polylines.add(
        Polyline(
          polylineId: const PolylineId('artillery_trajectory_track'),
          points: points,
          color: artillery.firingSolution.value!.isCrestClear
              ? const Color(0xFF00F0FF)
              : const Color(0xFFEF4444),
          width: 4.5,
        ),
      );
    }

    // 3. Minefield Safe Breaching Lane Centerline
    if (currentTacticalMode.value == 'minefield' &&
        minefield.zoneResult.value != null) {
      polylines.add(
        Polyline(
          polylineId: const PolylineId('minefield_breach_centerline'),
          points: minefield.zoneResult.value!.breachLaneCenterline,
          color: const Color(0xFF10B981),
          width: 4.0,
        ),
      );
    }

    // 4. Tactical Overlays Lines
    for (final layer in overlays.overlayLayers) {
      if (layer.isVisible) {
        for (int i = 0; i < layer.lines.length; i++) {
          polylines.add(
            Polyline(
              polylineId: PolylineId('overlay_${layer.id}_line_$i'),
              points: layer.lines[i],
              color: layer.color,
              width: 4.0,
            ),
          );
        }
      }
    }

    // 5. Active Route Polyline
    if (navigation.activeRoute.value != null &&
        navigation.activeRoute.value!.polylinePoints.isNotEmpty) {
      polylines.add(
        Polyline(
          polylineId: const PolylineId('tactical_on_device_route'),
          points: navigation.activeRoute.value!.polylinePoints,
          color: navState.isNavigating
              ? const Color(0xFF00F0FF)
              : const Color(0xFF38BDF8),
          width: navState.isNavigating ? 6.5 : 5.0,
        ),
      );
    }

    return polylines;
  }

  /// Build all declarative map polygons / تجميع مضلعات الخريطة
  Set<Polygon> buildPolygons() {
    final polygons = <Polygon>{};

    // 1. 360 Viewshed Radar Visible Polygon Fill
    if (currentTacticalMode.value == 'viewshed_360' &&
        viewshed.viewshedReport.value != null &&
        viewshed.viewshedReport.value!.polygonVertices.isNotEmpty) {
      polygons.add(
        Polygon(
          polygonId: const PolygonId('viewshed_360_fill'),
          points: viewshed.viewshedReport.value!.polygonVertices,
          fillColor: const Color(0x4422C55E),
          strokeColor: const Color(0xFF22C55E),
          strokeWidth: 2,
        ),
      );
    }

    // 2. HLZ Pad Boundary & Approach Corridor
    if (currentTacticalMode.value == 'hlz' &&
        hlz.assessmentResult.value != null) {
      polygons.add(
        Polygon(
          polygonId: const PolygonId('hlz_pad_boundary'),
          points: hlz.assessmentResult.value!.padBoundary,
          fillColor: hlz.assessmentResult.value!.gradeColor.withAlpha(50),
          strokeColor: hlz.assessmentResult.value!.gradeColor,
          strokeWidth: 2,
        ),
      );

      polygons.add(
        Polygon(
          polygonId: const PolygonId('hlz_approach_corridor'),
          points: hlz.assessmentResult.value!.approachFunnel,
          fillColor: const Color(0x3338BDF8),
          strokeColor: const Color(0xFF38BDF8),
          strokeWidth: 1.5,
        ),
      );
    }

    // 3. Minefield Boundary & Safe Breaching Lane
    if (currentTacticalMode.value == 'minefield' &&
        minefield.zoneResult.value != null) {
      polygons.add(
        Polygon(
          polygonId: const PolygonId('minefield_threat_boundary'),
          points: minefield.zoneResult.value!.boundaryPolygon,
          fillColor: const Color(0x44EF4444),
          strokeColor: const Color(0xFFEF4444),
          strokeWidth: 2,
        ),
      );

      polygons.add(
        Polygon(
          polygonId: const PolygonId('minefield_safe_breach_polygon'),
          points: minefield.zoneResult.value!.breachLanePolygon,
          fillColor: const Color(0x6610B981),
          strokeColor: const Color(0xFF10B981),
          strokeWidth: 2,
        ),
      );
    }

    // 4. Isochrone Response Time Rings
    if (currentTacticalMode.value == 'isochrone' &&
        isochrone.isochroneRings.isNotEmpty) {
      for (int i = 0; i < isochrone.isochroneRings.length; i++) {
        final ring = isochrone.isochroneRings[i];
        polygons.add(
          Polygon(
            polygonId: PolygonId('isochrone_ring_$i'),
            points: ring.polygonCoordinates,
            fillColor: ring.ringColor.withAlpha(30),
            strokeColor: ring.ringColor,
            strokeWidth: 2,
          ),
        );
      }
    }

    // 5. Tactical Overlays Polygons
    for (final layer in overlays.overlayLayers) {
      if (layer.isVisible) {
        for (int i = 0; i < layer.polygons.length; i++) {
          polygons.add(
            Polygon(
              polygonId: PolygonId('overlay_${layer.id}_poly_$i'),
              points: layer.polygons[i],
              fillColor: layer.color.withAlpha(40),
              strokeColor: layer.color,
              strokeWidth: 2,
            ),
          );
        }
      }
    }

    return polygons;
  }
}