import 'dart:convert';
import 'package:http/http.dart' as http;

class NominatimGeocoder {
  static Future<String?> reverseGeocodeCity(double lat, double lng) async {
    final uri = Uri.parse(
      'https://nominatim.openstreetmap.org/reverse'
      '?format=json&lat=$lat&lon=$lng&zoom=10&addressdetails=1',
    );
    final res = await http.get(
      uri,
      headers: {'User-Agent': 'ProsApp/1.0 (prosapp.co)'},
    );
    final data = jsonDecode(res.body) as Map<String, dynamic>;
    final address = data['address'] as Map<String, dynamic>?;
    return address?['city'] as String? ??
        address?['town'] as String? ??
        address?['municipality'] as String? ??
        address?['county'] as String?;
  }

  static Future<(double lat, double lng)?> forwardGeocodeCity(
      String cityName) async {
    final uri = Uri.parse(
      'https://nominatim.openstreetmap.org/search'
      '?format=json&limit=1&q=${Uri.encodeQueryComponent(cityName)}',
    );
    final res = await http.get(
      uri,
      headers: {'User-Agent': 'ProsApp/1.0 (prosapp.co)'},
    );
    final data = jsonDecode(res.body) as List;
    if (data.isEmpty) return null;
    final first = data.first as Map<String, dynamic>;
    final lat = double.tryParse(first['lat']?.toString() ?? '');
    final lng = double.tryParse(first['lon']?.toString() ?? '');
    if (lat == null || lng == null) return null;
    return (lat, lng);
  }
}