import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../data/places_repository.dart';
import '../../providers/places_provider.dart';
import '../widgets/poi_chip.dart';

class PlaceDetailScreen extends ConsumerStatefulWidget {
  final String osmType;
  final int osmId;

  const PlaceDetailScreen({
    super.key,
    required this.osmType,
    required this.osmId,
  });

  @override
  ConsumerState<PlaceDetailScreen> createState() => _PlaceDetailScreenState();
}

class _PlaceDetailScreenState extends ConsumerState<PlaceDetailScreen> {
  PlaceData? _place;
  bool _isLoading = true;
  String? _error;
  bool _isFavorited = false;
  int? _favoriteId;

  @override
  void initState() {
    super.initState();
    _loadPlace();
  }

  Future<void> _loadPlace() async {
    try {
      final repo = ref.read(placesRepositoryProvider);
      final place = await repo.getPoiDetail(widget.osmType, widget.osmId);
      final fav = await repo.isFavorited(widget.osmType, widget.osmId);
      if (mounted) {
        setState(() {
          _place = place;
          _isLoading = false;
          _isFavorited = fav != null;
          _favoriteId = fav?.id;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _error = 'Could not load place details.';
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_place?.name ?? 'Place Details'),
      ),
      body: _buildBody(context),
    );
  }

  Widget _buildBody(BuildContext context) {
    if (_isLoading) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_error != null) {
      return Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.error_outline, size: 48),
            const SizedBox(height: 8),
            Text(_error!),
            const SizedBox(height: 16),
            FilledButton(
              onPressed: () {
                setState(() {
                  _isLoading = true;
                  _error = null;
                });
                _loadPlace();
              },
              child: const Text('Retry'),
            ),
          ],
        ),
      );
    }

    final place = _place!;

    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Name and category
          Text(place.name, style: Theme.of(context).textTheme.headlineSmall),
          const SizedBox(height: 8),
          PoiChip(category: place.category),
          const SizedBox(height: 16),

          // Address
          if (place.displayAddress.isNotEmpty) ...[
            _InfoRow(
              icon: Icons.location_on,
              label: 'Address',
              value: place.displayAddress,
            ),
            const SizedBox(height: 12),
          ],

          // Opening hours
          if (place.openingHoursParsed != null) ...[
            _InfoRow(
              icon: Icons.access_time,
              label: 'Hours',
              value: _formatOpeningHours(place),
            ),
            const SizedBox(height: 12),
          ] else if (place.openingHours != null) ...[
            _InfoRow(
              icon: Icons.access_time,
              label: 'Hours',
              value: place.openingHours!,
            ),
            const SizedBox(height: 12),
          ],

          // Phone
          if (place.phone != null) ...[
            _InfoRow(
              icon: Icons.phone,
              label: 'Phone',
              value: place.phone!,
            ),
            const SizedBox(height: 12),
          ],

          // Website
          if (place.website != null) ...[
            _InfoRow(
              icon: Icons.language,
              label: 'Website',
              value: place.website!,
            ),
            const SizedBox(height: 12),
          ],

          // Wheelchair accessibility
          if (place.wheelchair != null) ...[
            _InfoRow(
              icon: Icons.accessible,
              label: 'Wheelchair',
              value: _wheelchairLabel(place.wheelchair!),
            ),
            const SizedBox(height: 12),
          ],

          const SizedBox(height: 24),

          // Action buttons
          Row(
            children: [
              Expanded(
                child: FilledButton.icon(
                  onPressed: () {
                    context.push('/route', extra: {
                      'destLat': place.latitude,
                      'destLon': place.longitude,
                      'destName': place.name,
                    });
                  },
                  icon: const Icon(Icons.directions),
                  label: const Text('Directions'),
                ),
              ),
              const SizedBox(width: 8),
              Expanded(
                child: _isFavorited
                    ? FilledButton.tonalIcon(
                        onPressed: () async {
                          if (_favoriteId != null) {
                            await ref
                                .read(placesProvider.notifier)
                                .removeFromFavorites(_favoriteId!);
                            setState(() {
                              _isFavorited = false;
                              _favoriteId = null;
                            });
                          }
                        },
                        icon: const Icon(Icons.bookmark),
                        label: const Text('Saved'),
                      )
                    : OutlinedButton.icon(
                        onPressed: () async {
                          await ref
                              .read(placesProvider.notifier)
                              .addToFavorites(place);
                          final fav = await ref
                              .read(placesRepositoryProvider)
                              .isFavorited(place.osmType, place.osmId);
                          setState(() {
                            _isFavorited = true;
                            _favoriteId = fav?.id;
                          });
                        },
                        icon: const Icon(Icons.bookmark_add_outlined),
                        label: const Text('Save'),
                      ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          SizedBox(
            width: double.infinity,
            child: OutlinedButton.icon(
              onPressed: () {
                final coords =
                    '${place.latitude.toStringAsFixed(6)},${place.longitude.toStringAsFixed(6)}';
                Clipboard.setData(ClipboardData(text: coords));
                ScaffoldMessenger.of(context).showSnackBar(
                  SnackBar(content: Text('Coordinates copied: $coords')),
                );
              },
              icon: const Icon(Icons.share),
              label: const Text('Share coordinates'),
            ),
          ),
        ],
      ),
    );
  }

  String _formatOpeningHours(PlaceData place) {
    final parsed = place.openingHoursParsed!;
    final parts = <String>[];
    final isOpen = parsed['is_open'] as bool?;
    if (isOpen == true) {
      parts.add('Open now');
    } else if (isOpen == false) {
      parts.add('Closed');
    }
    final today = parsed['today'] as String?;
    if (today != null) {
      parts.add('Today: $today');
    }
    final nextChange = parsed['next_change'] as String?;
    if (nextChange != null) {
      parts.add(nextChange);
    }
    return parts.join(' \u2022 ');
  }

  String _wheelchairLabel(String value) {
    switch (value) {
      case 'yes':
        return 'Wheelchair accessible';
      case 'limited':
        return 'Limited wheelchair access';
      case 'no':
        return 'Not wheelchair accessible';
      default:
        return value;
    }
  }
}

class _InfoRow extends StatelessWidget {
  final IconData icon;
  final String label;
  final String value;

  const _InfoRow({
    required this.icon,
    required this.label,
    required this.value,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Icon(icon, size: 20, color: Theme.of(context).colorScheme.primary),
        const SizedBox(width: 12),
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                label,
                style: Theme.of(context).textTheme.labelSmall?.copyWith(
                      color: Theme.of(context).colorScheme.outline,
                    ),
              ),
              Text(value, style: Theme.of(context).textTheme.bodyMedium),
            ],
          ),
        ),
      ],
    );
  }
}