builds, has camera cache

2026-07-17 09:37:28 +02:00 · 2025-08-12 21:20:57 -05:00
parent d0f92f6daf
commit 6331f68b2b
3 changed files with 172 additions and 37 deletions
@@ -0,0 +1,64 @@
+import 'dart:async';
+import 'package:flutter/material.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
+
+import '../services/map_data_provider.dart';
+import '../services/camera_cache.dart';
+import '../models/camera_profile.dart';
+import '../models/osm_camera_node.dart';
+import '../app_state.dart';
+
+/// Provides cameras for a map view, using an in-memory cache and optionally
+/// merging in new results from Overpass via MapDataProvider when not offline.
+class CameraProviderWithCache extends ChangeNotifier {
+  static final CameraProviderWithCache instance = CameraProviderWithCache._internal();
+  factory CameraProviderWithCache() => instance;
+  CameraProviderWithCache._internal();
+
+  Timer? _debounceTimer;
+
+  /// Call this to get (quickly) all cached overlays for the given view.
+  List<OsmCameraNode> getCachedCamerasForBounds(LatLngBounds bounds) {
+    return CameraCache.instance.queryByBounds(bounds);
+  }
+
+  /// Call this when the map view changes (bounds/profiles), triggers async fetch
+  /// and notifies listeners/UI when new data is available.
+  void fetchAndUpdate({
+    required LatLngBounds bounds,
+    required List<CameraProfile> profiles,
+    UploadMode uploadMode = UploadMode.production,
+  }) {
+    // Fast: serve cached immediately
+    notifyListeners();
+    // Debounce rapid panning/zooming
+    _debounceTimer?.cancel();
+    _debounceTimer = Timer(const Duration(milliseconds: 400), () async {
+      final isOffline = AppState.instance.offlineMode;
+      if (!isOffline) {
+        try {
+          final fresh = await MapDataProvider().getCameras(
+            bounds: bounds,
+            profiles: profiles,
+            uploadMode: uploadMode,
+            source: MapSource.remote,
+          );
+          if (fresh.isNotEmpty) {
+            CameraCache.instance.addOrUpdate(fresh);
+            notifyListeners();
+          }
+        } catch (e) {
+          debugPrint('[CameraProviderWithCache] Overpass fetch failed: $e');
+          // Cache already holds whatever is available for the view
+        }
+      } // else, only cache is used
+    });
+  }
+
+  /// Optionally: clear the cache (could be used for testing/dev)
+  void clearCache() {
+    CameraCache.instance.clear();
+    notifyListeners();
+  }
+}