import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:intl/intl.dart';
import '../models/sito.dart';
import '../models/allarme.dart';
import '../services/api_service.dart';
import '../widgets/allarme_card.dart';
import '../utils/constants.dart';

class SitoDetailScreen extends StatefulWidget {
  final Sito sito;

  const SitoDetailScreen({super.key, required this.sito});

  @override
  State<SitoDetailScreen> createState() => _SitoDetailScreenState();
}

class _SitoDetailScreenState extends State<SitoDetailScreen>
    with SingleTickerProviderStateMixin {
  final _apiService = ApiService();
  List<Allarme> _allarmi = [];
  bool _isLoadingAllarmi = true;
  String? _errorMessage;
  late TabController _tabController;
  GoogleMapController? _mapController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
    _loadAllarmi();
  }

  @override
  void dispose() {
    _tabController.dispose();
    _mapController?.dispose();
    super.dispose();
  }

  Future<void> _loadAllarmi() async {
    try {
      final response = await _apiService.getAllarmiBySito(widget.sito.id);
      setState(() {
        _allarmi = response.items;
        _isLoadingAllarmi = false;
      });
    } catch (e) {
      setState(() {
        _errorMessage = 'Errore caricamento allarmi: $e';
        _isLoadingAllarmi = false;
      });
    }
  }

  Color _getTipoColor() {
    switch (widget.sito.tipo) {
      case 'ponte':
        return Colors.blue;
      case 'galleria':
        return Colors.brown;
      case 'diga':
        return Colors.cyan;
      case 'frana':
        return Colors.orange;
      case 'versante':
        return Colors.green;
      case 'edificio':
        return Colors.purple;
      default:
        return AppColors.primary;
    }
  }

  IconData _getTipoIcon() {
    switch (widget.sito.tipo) {
      case 'ponte':
        return Icons.architecture;
      case 'galleria':
        return Icons.south_west;
      case 'diga':
        return Icons.water_damage;
      case 'frana':
        return Icons.landscape;
      case 'versante':
        return Icons.terrain;
      case 'edificio':
        return Icons.business;
      default:
        return Icons.location_on;
    }
  }

  int get _allarmiCritici =>
      _allarmi.where((a) => a.severita == 'critical').length;
  int get _allarmiAperti =>
      _allarmi.where((a) => a.stato != 'risolto').length;

  @override
  Widget build(BuildContext context) {
    final dateFormat = DateFormat('dd/MM/yyyy');

    return Scaffold(
      body: NestedScrollView(
        headerSliverBuilder: (context, innerBoxIsScrolled) {
          return [
            SliverAppBar(
              expandedHeight: 180,
              pinned: true,
              flexibleSpace: FlexibleSpaceBar(
                background: Container(
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [
                        _getTipoColor(),
                        _getTipoColor().withOpacity(0.7),
                      ],
                    ),
                  ),
                  child: SafeArea(
                    child: Padding(
                      padding: const EdgeInsets.fromLTRB(
                        AppSizes.paddingL,
                        AppSizes.paddingL,
                        AppSizes.paddingL,
                        70, // Spazio per le tab (altezza standard tab bar)
                      ),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: [
                          Row(
                            children: [
                              Container(
                                padding: const EdgeInsets.all(12),
                                decoration: BoxDecoration(
                                  color: Colors.white,
                                  borderRadius: BorderRadius.circular(12),
                                ),
                                child: Icon(
                                  _getTipoIcon(),
                                  size: 32,
                                  color: _getTipoColor(),
                                ),
                              ),
                              const SizedBox(width: 12),
                              Expanded(
                                child: Column(
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                  children: [
                                    Text(
                                      widget.sito.tipoReadable,
                                      style: TextStyle(
                                        color: Colors.white.withOpacity(0.9),
                                        fontSize: 14,
                                      ),
                                    ),
                                    Text(
                                      widget.sito.nome,
                                      style: const TextStyle(
                                        color: Colors.white,
                                        fontSize: 24,
                                        fontWeight: FontWeight.bold,
                                      ),
                                      maxLines: 2,
                                      overflow: TextOverflow.ellipsis,
                                    ),
                                  ],
                                ),
                              ),
                            ],
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              ),
              bottom: TabBar(
                controller: _tabController,
                tabs: const [
                  Tab(text: 'Informazioni', icon: Icon(Icons.info_outline)),
                  Tab(text: 'Allarmi', icon: Icon(Icons.notifications_active)),
                ],
              ),
            ),
          ];
        },
        body: TabBarView(
          controller: _tabController,
          children: [
            // Tab Informazioni
            _buildInfoTab(dateFormat),

            // Tab Allarmi
            _buildAllarmiTab(),
          ],
        ),
      ),
    );
  }

  Widget _buildInfoTab(DateFormat dateFormat) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(AppSizes.paddingL),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Statistiche rapide
          Row(
            children: [
              Expanded(
                child: _buildStatCard(
                  'Allarmi Totali',
                  _allarmi.length.toString(),
                  Icons.notifications,
                  AppColors.primary,
                ),
              ),
              const SizedBox(width: AppSizes.paddingM),
              Expanded(
                child: _buildStatCard(
                  'Critici',
                  _allarmiCritici.toString(),
                  Icons.warning,
                  AppColors.critical,
                ),
              ),
              const SizedBox(width: AppSizes.paddingM),
              Expanded(
                child: _buildStatCard(
                  'Aperti',
                  _allarmiAperti.toString(),
                  Icons.pending,
                  AppColors.warning,
                ),
              ),
            ],
          ),
          const SizedBox(height: 24),

          // Descrizione
          if (widget.sito.descrizione != null) ...[
            const Text('Descrizione', style: AppTextStyles.h3),
            const SizedBox(height: 8),
            Text(
              widget.sito.descrizione!,
              style: AppTextStyles.bodyLarge,
            ),
            const SizedBox(height: 24),
          ],

          // Mappa
          if (widget.sito.hasCoordinates) ...[
            const Text('Posizione', style: AppTextStyles.h3),
            const SizedBox(height: 12),
            _buildMapView(),
            const SizedBox(height: 24),
          ],

          // Dettagli tecnici
          const Text('Dettagli', style: AppTextStyles.h3),
          const SizedBox(height: 12),
          _buildInfoCard(
            icon: Icons.place,
            title: 'Località',
            value: widget.sito.localita,
          ),
          if (widget.sito.regione != null) ...[
            const SizedBox(height: 8),
            _buildInfoCard(
              icon: Icons.map,
              title: 'Regione',
              value: widget.sito.regione!,
            ),
          ],
          if (widget.sito.codiceIdentificativo != null) ...[
            const SizedBox(height: 8),
            _buildInfoCard(
              icon: Icons.qr_code,
              title: 'Codice Identificativo',
              value: widget.sito.codiceIdentificativo!,
            ),
          ],
          if (widget.sito.hasCoordinates) ...[
            const SizedBox(height: 8),
            _buildInfoCard(
              icon: Icons.my_location,
              title: 'Coordinate',
              value:
                  '${widget.sito.latitudine!.toStringAsFixed(6)}, ${widget.sito.longitudine!.toStringAsFixed(6)}',
            ),
          ],
          if (widget.sito.altitudine != null) ...[
            const SizedBox(height: 8),
            _buildInfoCard(
              icon: Icons.height,
              title: 'Altitudine',
              value: '${widget.sito.altitudine!.toStringAsFixed(0)} m s.l.m.',
            ),
          ],
          const SizedBox(height: 8),
          _buildInfoCard(
            icon: Icons.calendar_today,
            title: 'Data creazione',
            value: dateFormat.format(widget.sito.createdAt),
          ),
        ],
      ),
    );
  }

  Widget _buildAllarmiTab() {
    if (_isLoadingAllarmi) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_errorMessage != null) {
      return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.error_outline, size: 64, color: AppColors.critical),
            const SizedBox(height: 16),
            Text(_errorMessage!),
            const SizedBox(height: 16),
            ElevatedButton.icon(
              onPressed: _loadAllarmi,
              icon: const Icon(Icons.refresh),
              label: const Text('Riprova'),
            ),
          ],
        ),
      );
    }

    if (_allarmi.isEmpty) {
      return const Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(Icons.check_circle_outline, size: 64, color: AppColors.success),
            SizedBox(height: 16),
            Text('Nessun allarme registrato', style: AppTextStyles.h3),
            SizedBox(height: 8),
            Text(
              'Questo sito non ha allarmi nello storico',
              style: AppTextStyles.bodyMedium,
              textAlign: TextAlign.center,
            ),
          ],
        ),
      );
    }

    return RefreshIndicator(
      onRefresh: _loadAllarmi,
      child: ListView.builder(
        padding: const EdgeInsets.all(AppSizes.paddingM),
        itemCount: _allarmi.length,
        itemBuilder: (context, index) {
          return AllarmeCard(allarme: _allarmi[index]);
        },
      ),
    );
  }

  Widget _buildStatCard(String label, String value, IconData icon, Color color) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: color.withOpacity(0.3)),
      ),
      child: Column(
        children: [
          Icon(icon, color: color, size: 24),
          const SizedBox(height: 8),
          Text(
            value,
            style: TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
              color: color,
            ),
          ),
          const SizedBox(height: 4),
          Text(
            label,
            style: TextStyle(
              fontSize: 11,
              color: color,
            ),
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }

  Widget _buildInfoCard({
    required IconData icon,
    required String title,
    required String value,
  }) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: Colors.grey[100],
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: Colors.grey[300]!),
      ),
      child: Row(
        children: [
          Icon(icon, color: _getTipoColor(), size: 20),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: AppTextStyles.bodySmall.copyWith(
                    color: AppColors.textSecondary,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  value,
                  style: AppTextStyles.bodyMedium.copyWith(
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMapView() {
    if (!widget.sito.hasCoordinates) {
      return const SizedBox.shrink();
    }

    final position =
        LatLng(widget.sito.latitudine!, widget.sito.longitudine!);

    return Container(
      height: 250,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: Colors.grey[300]!),
      ),
      clipBehavior: Clip.hardEdge,
      child: GoogleMap(
        initialCameraPosition: CameraPosition(
          target: position,
          zoom: 14,
        ),
        markers: {
          Marker(
            markerId: MarkerId('sito_${widget.sito.id}'),
            position: position,
            infoWindow: InfoWindow(
              title: widget.sito.nome,
              snippet: widget.sito.tipoReadable,
            ),
            icon: BitmapDescriptor.defaultMarkerWithHue(
              _getTipoColor() == Colors.blue
                  ? BitmapDescriptor.hueBlue
                  : _getTipoColor() == Colors.green
                      ? BitmapDescriptor.hueGreen
                      : _getTipoColor() == Colors.orange
                          ? BitmapDescriptor.hueOrange
                          : BitmapDescriptor.hueRed,
            ),
          ),
        },
        myLocationButtonEnabled: true,
        zoomControlsEnabled: true,
        mapToolbarEnabled: false,
        onMapCreated: (controller) {
          _mapController = controller;
        },
      ),
    );
  }
}