import 'dart:async';

import 'package:flutter/material.dart';
import 'package:geocoding/geocoding.dart';
import 'package:objectid/objectid.dart';

import 'models/yourLocation.dart';

/// Open a places dialog for selecting a location using geocoding.
/// Allows users to search for places by name and get coordinates.
Future<YourLocation> openPlacesDialog(GlobalKey<ScaffoldState> sc) async {
  final BuildContext? context = sc.currentContext;
  if (context == null) {
    return YourLocation.noLocation;
  }

  final YourLocation? selectedLocation = await showDialog<YourLocation>(
    context: context,
    builder: (BuildContext context) => const _PlaceSelectionDialog(),
  );

  return selectedLocation ?? YourLocation.noLocation;
}

class _PlaceSelectionDialog extends StatefulWidget {
  const _PlaceSelectionDialog();

  @override
  State<_PlaceSelectionDialog> createState() => _PlaceSelectionDialogState();
}

class _PlaceSelectionDialogState extends State<_PlaceSelectionDialog> {
  final TextEditingController _searchController = TextEditingController();
  List<Location> _searchResults = <Location>[];
  bool _isSearching = false;
  String? _errorMessage;

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

  Future<void> _searchPlaces(String query) async {
    if (query.isEmpty) {
      setState(() {
        _searchResults = <Location>[];
        _errorMessage = null;
      });
      return;
    }

    setState(() {
      _isSearching = true;
      _errorMessage = null;
    });

    try {
      final List<Location> locations = await locationFromAddress(query);
      setState(() {
        _searchResults = locations;
        if (_searchResults.isEmpty) {
          _errorMessage = 'No places found. Try a different search.';
        }
      });
    } catch (e) {
      setState(() {
        _errorMessage = 'Search error: ${e.toString()}';
        _searchResults = <Location>[];
      });
    } finally {
      setState(() {
        _isSearching = false;
      });
    }
  }

  Future<String> _getPlaceName(Location location) async {
    try {
      final List<Placemark> placemarks =
          await placemarkFromCoordinates(location.latitude, location.longitude);
      if (placemarks.isNotEmpty) {
        final Placemark place = placemarks.first;
        final List<String> parts = <String>[];
        if (place.name != null && place.name!.isNotEmpty)
          parts.add(place.name!);
        if (place.locality != null && place.locality!.isNotEmpty)
          parts.add(place.locality!);
        if (place.country != null && place.country!.isNotEmpty)
          parts.add(place.country!);
        if (parts.isNotEmpty) {
          return parts.join(', ');
        }
      }
    } catch (e) {
      // Fall back to coordinates
    }
    return '${location.latitude.toStringAsFixed(4)}, ${location.longitude.toStringAsFixed(4)}';
  }

  void _selectLocation(Location location) async {
    final String description = await _getPlaceName(location);
    if (!mounted) {
      return;
    }

    final YourLocation yourLocation = YourLocation(
      id: ObjectId(),
      lat: location.latitude,
      lon: location.longitude,
      description: description,
      distance: 10,
    );

    Navigator.of(context).pop(yourLocation);
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: const Text('Search for a place'),
      content: SizedBox(
        width: double.maxFinite,
        child: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              TextField(
                controller: _searchController,
                decoration: InputDecoration(
                  hintText: 'Enter city, address, or landmark',
                  prefixIcon: const Icon(Icons.search),
                  suffixIcon: _isSearching
                      ? const SizedBox(
                          width: 20,
                          height: 20,
                          child: Padding(
                            padding: EdgeInsets.all(8.0),
                            child: CircularProgressIndicator(strokeWidth: 2),
                          ),
                        )
                      : null,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(8),
                  ),
                ),
                onChanged: (String value) {
                  if (value.length > 2) {
                    _searchPlaces(value);
                  } else {
                    setState(() {
                      _searchResults = <Location>[];
                      _errorMessage = null;
                    });
                  }
                },
              ),
              const SizedBox(height: 16),
              if (_errorMessage != null)
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Text(
                    _errorMessage!,
                    style: const TextStyle(color: Colors.red, fontSize: 12),
                  ),
                ),
              if (_searchResults.isNotEmpty)
                SizedBox(
                  height: 300,
                  child: ListView.builder(
                    shrinkWrap: true,
                    itemCount: _searchResults.length,
                    itemBuilder: (BuildContext context, int index) {
                      final Location location = _searchResults[index];
                      return FutureBuilder<String>(
                        future: _getPlaceName(location),
                        builder: (BuildContext context,
                            AsyncSnapshot<String> snapshot) {
                          final String displayName = snapshot.data ??
                              '${location.latitude.toStringAsFixed(4)}, ${location.longitude.toStringAsFixed(4)}';
                          return ListTile(
                            leading: const Icon(Icons.location_on),
                            title: Text(displayName),
                            subtitle: Text(
                              '${location.latitude.toStringAsFixed(4)}, ${location.longitude.toStringAsFixed(4)}',
                              style: const TextStyle(fontSize: 12),
                            ),
                            onTap: () => _selectLocation(location),
                          );
                        },
                      );
                    },
                  ),
                ),
            ],
          ),
        ),
      ),
      actions: <Widget>[
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('Cancel'),
        ),
      ],
    );
  }
}