import 'package:flutter/material.dart';
import 'package:intaleq_maps/intaleq_maps.dart';
import '../models/landmark.dart';
import '../services/landmark_database.dart';
import '../services/local_sqlite_db.dart';
import '../services/offline_routing_engine.dart';
import '../services/offline_routing_package_service.dart';
import '../services/tactical_api_service.dart';

class TacticalRoutePlannerSheet extends StatefulWidget {
  final LatLng currentGps;
  final LatLng? resectionFix;
  final LatLng? initialOrigin;
  final LatLng? initialDestination;
  final Function(LatLng origin, LatLng destination, TacticalVehicleProfile profile, bool autoStartNav) onRouteConfirmed;
  final VoidCallback onPickOriginOnMap;
  final VoidCallback onPickDestinationOnMap;
  final VoidCallback onClose;

  const TacticalRoutePlannerSheet({
    super.key,
    required this.currentGps,
    this.resectionFix,
    this.initialOrigin,
    this.initialDestination,
    required this.onRouteConfirmed,
    required this.onPickOriginOnMap,
    required this.onPickDestinationOnMap,
    required this.onClose,
  });

  @override
  State<TacticalRoutePlannerSheet> createState() => _TacticalRoutePlannerSheetState();
}

class _TacticalRoutePlannerSheetState extends State<TacticalRoutePlannerSheet> {
  late LatLng _origin;
  String _originName = 'موقعي الحالي (GPS)';

  LatLng? _destination;
  TacticalVehicleProfile _selectedProfile = TacticalVehicleProfile.convoy;

  // Search state
  final TextEditingController _destSearchCtrl = TextEditingController();
  List<TacticalLandmark> _searchResults = [];
  bool _isSearching = false;

  @override
  void initState() {
    super.initState();
    _origin = widget.initialOrigin ?? widget.resectionFix ?? widget.currentGps;
    if (widget.initialOrigin != null) {
      _originName = 'نقطة محددة من الخريطة (${widget.initialOrigin!.latitude.toStringAsFixed(4)}, ${widget.initialOrigin!.longitude.toStringAsFixed(4)})';
    } else if (widget.resectionFix != null) {
      _originName = 'موقع الراصد المستخرج (التقاطع البصري)';
    }

    if (widget.initialDestination != null) {
      _destination = widget.initialDestination;
      _destSearchCtrl.text = 'نقطة الهدف المحددة (${widget.initialDestination!.latitude.toStringAsFixed(4)}, ${widget.initialDestination!.longitude.toStringAsFixed(4)})';
    }
  }

  @override
  void dispose() {
    _destSearchCtrl.dispose();
    super.dispose();
  }

  void _onSearch(String query) async {
    final cleanQuery = query.trim();
    if (cleanQuery.isEmpty) {
      setState(() => _searchResults = []);
      return;
    }

    setState(() => _isSearching = true);

    List<TacticalLandmark> dbResults = [];
    try {
      dbResults = await LocalSqliteDb.searchPlaces(cleanQuery, limit: 25);
    } catch (_) {}

    final staticResults = LandmarkDatabase.search(cleanQuery);

    List<TacticalLandmark> onlineResults = [];
    if (dbResults.length < 5) {
      try {
        onlineResults = await TacticalApiService.searchOnlinePlaces(cleanQuery);
      } catch (_) {}
    }

    final combined = <TacticalLandmark>[...dbResults, ...onlineResults, ...staticResults];
    final seen = <String>{};
    final unique = <TacticalLandmark>[];
    for (final r in combined) {
      if (seen.add('${r.name}_${r.lat}_${r.lng}')) {
        unique.add(r);
      }
    }

    if (mounted) {
      setState(() {
        _searchResults = unique;
        _isSearching = false;
      });
    }
  }

  void _selectDestination(TacticalLandmark item) {
    setState(() {
      _destination = LatLng(item.lat, item.lng);
      _searchResults = [];
      _destSearchCtrl.text = '${item.name} (${item.region})';
    });
  }

  void _calculateAndPreview() {
    if (_destination == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          backgroundColor: Color(0xFFEF4444),
          content: Text('يرجى تحديد نقطة الوصول / الهدف أولاً.'),
        ),
      );
      return;
    }

    widget.onClose();
    widget.onRouteConfirmed(_origin, _destination!, _selectedProfile, false);
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: const BoxDecoration(
        color: Color(0xFF090E1A),
        borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
        border: Border(top: BorderSide(color: Color(0xFF0071E3), width: 2)),
        boxShadow: [BoxShadow(color: Colors.black87, blurRadius: 30)],
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Header
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Row(
                children: [
                  Container(
                    padding: const EdgeInsets.all(6),
                    decoration: BoxDecoration(
                      color: const Color(0xFF0071E3).withValues(alpha: 0.15),
                      borderRadius: BorderRadius.circular(8),
                      border: Border.all(color: const Color(0xFF0071E3)),
                    ),
                    child: const Icon(Icons.alt_route, color: Color(0xFF38BDF8), size: 20),
                  ),
                  const SizedBox(width: 10),
                  const Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'مخطط مسارات القوافل التكتيكية (Routing)',
                        style: TextStyle(color: Colors.white, fontSize: 13.5, fontWeight: FontWeight.bold),
                      ),
                      Text(
                        'حساب المسار وتضاريس الطرق وسرعة القوافل',
                        style: TextStyle(color: Color(0xFF94A3B8), fontSize: 10.5),
                      ),
                    ],
                  ),
                ],
              ),
              IconButton(
                onPressed: widget.onClose,
                icon: const Icon(Icons.close, color: Colors.white70, size: 20),
              ),
            ],
          ),

          const SizedBox(height: 12),

          // Real road network engine status (on-device Valhalla package)
          ValueListenableBuilder<RoutingPackageStatus>(
            valueListenable: OfflineRoutingPackageService.status,
            builder: (context, pkgStatus, _) {
              return FutureBuilder<bool>(
                future: OfflineRoutingPackageService.isInstalled(),
                builder: (context, snapshot) {
                  final installed = snapshot.data ?? false;
                  final color = installed ? const Color(0xFF22C55E) : const Color(0xFFF59E0B);
                  final label = installed
                      ? 'التوجيه المحلي: شبكة الطرق الحقيقية للأردن + SRTM جاهزة (بدون إنترنت)'
                      : 'التوجيه المحلي الدقيق غير مثبت — نزّل حزمة الطرق من إعدادات الحزم';
                  return Container(
                    margin: const EdgeInsets.only(bottom: 10),
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(
                      color: color.withValues(alpha: 0.08),
                      borderRadius: BorderRadius.circular(8),
                      border: Border.all(color: color.withValues(alpha: 0.4)),
                    ),
                    child: Row(
                      children: [
                        Icon(installed ? Icons.route : Icons.download_rounded, color: color, size: 14),
                        const SizedBox(width: 8),
                        Expanded(
                          child: Text(
                            label,
                            style: TextStyle(color: color, fontSize: 9.5),
                          ),
                        ),
                        if (!installed && pkgStatus == RoutingPackageStatus.downloading)
                          SizedBox(
                            width: 10,
                            height: 10,
                            child: CircularProgressIndicator(strokeWidth: 1.5, color: color),
                          ),
                      ],
                    ),
                  );
                },
              );
            },
          ),

          // Origin & Destination Box
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: const Color(0xFF1E293B),
              borderRadius: BorderRadius.circular(14),
              border: Border.all(color: Colors.white12),
            ),
            child: Column(
              children: [
                // Origin Row
                Row(
                  children: [
                    const Icon(Icons.my_location, color: Color(0xFF22C55E), size: 18),
                    const SizedBox(width: 10),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          const Text('نقطة الانطلاق (البداية):', style: TextStyle(color: Color(0xFF94A3B8), fontSize: 10)),
                          Text(
                            _originName,
                            style: const TextStyle(color: Colors.white, fontSize: 12, fontWeight: FontWeight.bold),
                            overflow: TextOverflow.ellipsis,
                          ),
                        ],
                      ),
                    ),
                    IconButton(
                      icon: const Icon(Icons.touch_app, size: 18, color: Color(0xFF38BDF8)),
                      tooltip: 'تحديد نقطة البداية على الخريطة',
                      onPressed: widget.onPickOriginOnMap,
                    ),
                  ],
                ),

                const Divider(color: Colors.white12, height: 16),

                // Destination Search Row
                Row(
                  children: [
                    const Icon(Icons.location_on, color: Color(0xFFEF4444), size: 18),
                    const SizedBox(width: 10),
                    Expanded(
                      child: TextField(
                        controller: _destSearchCtrl,
                        onChanged: _onSearch,
                        style: const TextStyle(color: Colors.white, fontSize: 12.5),
                        decoration: InputDecoration(
                          hintText: 'ابحث عن نقطة الوصول أو الهدف...',
                          hintStyle: const TextStyle(color: Color(0xFF64748B), fontSize: 11.5),
                          isDense: true,
                          border: InputBorder.none,
                          contentPadding: const EdgeInsets.symmetric(vertical: 6),
                          suffixIcon: _destSearchCtrl.text.isNotEmpty
                              ? IconButton(
                                  icon: const Icon(Icons.clear, size: 14, color: Colors.white60),
                                  onPressed: () {
                                    _destSearchCtrl.clear();
                                    _onSearch('');
                                  },
                                  )
                              : null,
                        ),
                      ),
                    ),
                    IconButton(
                      icon: const Icon(Icons.touch_app, size: 18, color: Color(0xFFF59E0B)),
                      tooltip: 'تحديد الهدف على الخريطة',
                      onPressed: widget.onPickDestinationOnMap,
                    ),
                  ],
                ),
              ],
            ),
          ),

          if (_isSearching) ...[
            const SizedBox(height: 4),
            const LinearProgressIndicator(minHeight: 2, color: Color(0xFF0071E3), backgroundColor: Colors.transparent),
          ],

          // Search Results Dropdown
          if (_searchResults.isNotEmpty) ...[
            const SizedBox(height: 6),
            Container(
              constraints: const BoxConstraints(maxHeight: 160),
              decoration: BoxDecoration(
                color: const Color(0xFF1E293B),
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: Colors.white12),
              ),
              child: ListView.separated(
                padding: EdgeInsets.zero,
                shrinkWrap: true,
                itemCount: _searchResults.length,
                separatorBuilder: (_, __) => const Divider(color: Colors.white10, height: 1),
                itemBuilder: (ctx, i) {
                  final item = _searchResults[i];
                  return ListTile(
                    dense: true,
                    visualDensity: VisualDensity.compact,
                    leading: Icon(item.typeIcon, size: 16, color: const Color(0xFF38BDF8)),
                    title: Text(item.name, style: const TextStyle(color: Colors.white, fontSize: 11.5, fontWeight: FontWeight.bold)),
                    subtitle: Text('${item.region} • ${item.typeLabelArabic}', style: const TextStyle(color: Color(0xFF64748B), fontSize: 10)),
                    onTap: () => _selectDestination(item),
                  );
                },
              ),
            ),
          ],

          const SizedBox(height: 12),

          // Vehicle Profiles
          Row(
            children: [
              _buildProfileChip(TacticalVehicleProfile.convoy, 'قافلة عسكرية', Icons.local_shipping),
              const SizedBox(width: 6),
              _buildProfileChip(TacticalVehicleProfile.offroad4x4, 'دفع رباعي 4x4', Icons.directions_car),
              const SizedBox(width: 6),
              _buildProfileChip(TacticalVehicleProfile.rapidResponse, 'تدخل سريع', Icons.electric_bolt),
            ],
          ),

          const SizedBox(height: 14),

          // Action Button
          SizedBox(
            width: double.infinity,
            child: ElevatedButton.icon(
              onPressed: _calculateAndPreview,
              icon: const Icon(Icons.route, size: 18),
              label: const Text('حساب المسار وتضاريس الانحدار', style: TextStyle(fontSize: 13, fontWeight: FontWeight.w900)),
              style: ElevatedButton.styleFrom(
                backgroundColor: const Color(0xFF0071E3),
                foregroundColor: Colors.white,
                padding: const EdgeInsets.all(16),
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildProfileChip(TacticalVehicleProfile prof, String label, IconData icon) {
    final isSelected = _selectedProfile == prof;
    return Expanded(
      child: GestureDetector(
        onTap: () => setState(() => _selectedProfile = prof),
        child: Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            color: isSelected ? const Color(0xFF0071E3) : const Color(0xFF1E293B),
            borderRadius: BorderRadius.circular(10),
            border: Border.all(color: isSelected ? Colors.white : Colors.white12),
          ),
          child: Column(
            children: [
              Icon(icon, size: 16, color: isSelected ? Colors.white : const Color(0xFF94A3B8)),
              const SizedBox(height: 3),
              Text(
                label,
                style: TextStyle(
                  color: isSelected ? Colors.white : const Color(0xFF94A3B8),
                  fontSize: 10,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}