Search address / POI

lib/services/search_service.dart

@@ -0,0 +1,91 @@
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import 'package:latlong2/latlong.dart';
+
+import '../models/search_result.dart';
+
+class SearchService {
+  static const String _baseUrl = 'https://nominatim.openstreetmap.org';
+  static const String _userAgent = 'DeFlock/1.0 (OSM surveillance mapping app)';
+  static const int _maxResults = 5;
+  static const Duration _timeout = Duration(seconds: 10);
+  
+  /// Search for places using Nominatim geocoding service
+  Future<List<SearchResult>> search(String query) async {
+    if (query.trim().isEmpty) {
+      return [];
+    }
+    
+    // Check if query looks like coordinates first
+    final coordResult = _tryParseCoordinates(query.trim());
+    if (coordResult != null) {
+      return [coordResult];
+    }
+    
+    // Otherwise, use Nominatim API
+    return await _searchNominatim(query.trim());
+  }
+  
+  /// Try to parse various coordinate formats
+  SearchResult? _tryParseCoordinates(String query) {
+    // Remove common separators and normalize
+    final normalized = query.replaceAll(RegExp(r'[,;]'), ' ').trim();
+    final parts = normalized.split(RegExp(r'\s+'));
+    
+    if (parts.length != 2) return null;
+    
+    final lat = double.tryParse(parts[0]);
+    final lon = double.tryParse(parts[1]);
+    
+    if (lat == null || lon == null) return null;
+    
+    // Basic validation for Earth coordinates
+    if (lat < -90 || lat > 90 || lon < -180 || lon > 180) return null;
+    
+    return SearchResult(
+      displayName: 'Coordinates: ${lat.toStringAsFixed(6)}, ${lon.toStringAsFixed(6)}',
+      coordinates: LatLng(lat, lon),
+      category: 'coordinates',
+      type: 'point',
+    );
+  }
+  
+  /// Search using Nominatim API
+  Future<List<SearchResult>> _searchNominatim(String query) async {
+    final uri = Uri.parse('$_baseUrl/search').replace(queryParameters: {
+      'q': query,
+      'format': 'json',
+      'limit': _maxResults.toString(),
+      'addressdetails': '1',
+      'extratags': '1',
+    });
+    
+    debugPrint('[SearchService] Searching Nominatim: $uri');
+    
+    try {
+      final response = await http.get(
+        uri,
+        headers: {
+          'User-Agent': _userAgent,
+        },
+      ).timeout(_timeout);
+      
+      if (response.statusCode != 200) {
+        throw Exception('HTTP ${response.statusCode}: ${response.reasonPhrase}');
+      }
+      
+      final List<dynamic> jsonResults = json.decode(response.body);
+      final results = jsonResults
+          .map((json) => SearchResult.fromNominatim(json as Map<String, dynamic>))
+          .toList();
+      
+      debugPrint('[SearchService] Found ${results.length} results');
+      return results;
+      
+    } catch (e) {
+      debugPrint('[SearchService] Search failed: $e');
+      throw Exception('Search failed: $e');
+    }
+  }
+}