// Fetch all addresses in Hoogerheide using Overpass API
// Run with: dart fetch_addresses_overpass.dart

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

const hoogerheideRelationId = 2716716;
const overpassUrl = 'https://overpass-api.de/api/interpreter';

// Overpass query to get all addresses (nodes with addr:housenumber) in Hoogerheide
const overpassQuery = '''
[out:json][timeout:60];
relation($hoogerheideRelationId);
map_to_area -> .searchArea;
(
  node["addr:housenumber"]["addr:street"](area.searchArea);
  way["addr:housenumber"]["addr:street"](area.searchArea);
);
out body;
>;
out skel qt;
''';

Future<void> main() async {
  print('Fetching addresses from Hoogerheide (OSM relation $hoogerheideRelationId)...');

  try {
    final response = await http.post(
      Uri.parse(overpassUrl),
      body: {'data': overpassQuery},
      headers: {'User-Agent': 'DeliveryApp/1.0'},
    ).timeout(const Duration(seconds: 60));

    if (response.statusCode != 200) {
      print('Error: HTTP ${response.statusCode}');
      print(response.body);
      exit(1);
    }

    final data = jsonDecode(response.body);
    final elements = data['elements'] as List;

    // Parse addresses
    final addresses = <Map<String, dynamic>>[];
    final streetCoords = <String, List<double>>{};

    for (final el in elements) {
      if (el['type'] == 'node') {
        final tags = el['tags'] ?? {};
        final street = tags['addr:street'] ?? tags['name'];
        final housenumber = tags['addr:housenumber'];
        final lat = el['lat'];
        final lon = el['lon'];

        if (street != null && housenumber != null && lat != null && lon != null) {
          addresses.add({
            'street': street,
            'housenumber': housenumber,
            'lat': lat,
            'lon': lon,
          });

          // Store first coord for each street
          if (!streetCoords.containsKey(street)) {
            streetCoords[street] = [lat, lon];
          }
        }
      }
    }

    print('Found ${addresses.length} addresses on ${streetCoords.length} streets.');

    // Save to JSON
    final output = {
      'addresses': addresses,
      'streetCoords': streetCoords.map((k, v) => MapEntry(k, {'lat': v[0], 'lon': v[1]})),
      'fetched_at': DateTime.now().toIso8601String(),
    };

    final file = File('assets/hoogerheide_addresses.json');
    await file.create(recursive: true);
    await file.writeAsString(jsonEncode(output));
    print('Saved to ${file.path}');

    // Also create a Dart file with streetCoords for easy import
    final dartContent = StringBuffer();
    dartContent.writeln('// Auto-generated from Overpass API');
    dartContent.writeln('// Hoogerheide addresses fetched from OSM');
    dartContent.writeln();
    dartContent.writeln('class HoogerheideStreets {');
    dartContent.writeln('  static const streetCoords = {');

    streetCoords.forEach((street, coords) {
      dartContent.writeln("    '$street': [${coords[0]}, ${coords[1]}],");
    });

    dartContent.writeln('  };');
    dartContent.writeln('}');

    final dartFile = File('lib/hoogerheide_streets.dart');
    await dartFile.writeAsString(dartContent.toString());
    print('Saved Dart file to ${dartFile.path}');

  } catch (e) {
    print('Error: $e');
    exit(1);
  }
}