Two nodes too close together warning

lib/widgets/add_node_sheet.dart

@@ -6,13 +6,58 @@ import '../dev_config.dart';
 import '../models/node_profile.dart';
 import '../models/operator_profile.dart';
 import '../services/localization_service.dart';
+import '../services/node_cache.dart';
 import 'refine_tags_sheet.dart';
+import 'proximity_warning_dialog.dart';
 
 class AddNodeSheet extends StatelessWidget {
   const AddNodeSheet({super.key, required this.session});
 
   final AddNodeSession session;
 
+  void _checkProximityAndCommit(BuildContext context, AppState appState, LocalizationService locService) {
+    // Only check proximity if we have a target location
+    if (session.target == null) {
+      _commitWithoutCheck(context, appState, locService);
+      return;
+    }
+    
+    // Check for nearby nodes within the configured distance
+    final nearbyNodes = NodeCache.instance.findNodesWithinDistance(
+      session.target!, 
+      kNodeProximityWarningDistance,
+    );
+    
+    if (nearbyNodes.isNotEmpty) {
+      // Show proximity warning dialog
+      showDialog<void>(
+        context: context,
+        builder: (context) => ProximityWarningDialog(
+          nearbyNodes: nearbyNodes,
+          distance: kNodeProximityWarningDistance,
+          onGoBack: () {
+            Navigator.of(context).pop(); // Close dialog
+          },
+          onSubmitAnyway: () {
+            Navigator.of(context).pop(); // Close dialog
+            _commitWithoutCheck(context, appState, locService);
+          },
+        ),
+      );
+    } else {
+      // No nearby nodes, proceed with commit
+      _commitWithoutCheck(context, appState, locService);
+    }
+  }
+
+  void _commitWithoutCheck(BuildContext context, AppState appState, LocalizationService locService) {
+    appState.commitSession();
+    Navigator.pop(context);
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(locService.t('node.queuedForUpload'))),
+    );
+  }
+
   Widget _buildDirectionControls(BuildContext context, AppState appState, AddNodeSession session, LocalizationService locService) {
     final requiresDirection = session.profile != null && session.profile!.requiresDirection;
     
@@ -144,11 +189,7 @@ class AddNodeSheet extends StatelessWidget {
         final appState = context.watch<AppState>();
 
         void _commit() {
-          appState.commitSession();
-          Navigator.pop(context);
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text(locService.t('node.queuedForUpload'))),
-          );
+          _checkProximityAndCommit(context, appState, locService);
         }
 
         void _cancel() {

lib/widgets/edit_node_sheet.dart

@@ -6,15 +6,55 @@ import '../dev_config.dart';
 import '../models/node_profile.dart';
 import '../models/operator_profile.dart';
 import '../services/localization_service.dart';
+import '../services/node_cache.dart';
 import '../state/settings_state.dart';
 import 'refine_tags_sheet.dart';
 import 'advanced_edit_options_sheet.dart';
+import 'proximity_warning_dialog.dart';
 
 class EditNodeSheet extends StatelessWidget {
   const EditNodeSheet({super.key, required this.session});
 
   final EditNodeSession session;
 
+  void _checkProximityAndCommit(BuildContext context, AppState appState, LocalizationService locService) {
+    // Check for nearby nodes within the configured distance, excluding the node being edited
+    final nearbyNodes = NodeCache.instance.findNodesWithinDistance(
+      session.target, 
+      kNodeProximityWarningDistance,
+      excludeNodeId: session.originalNode.id,
+    );
+    
+    if (nearbyNodes.isNotEmpty) {
+      // Show proximity warning dialog
+      showDialog<void>(
+        context: context,
+        builder: (context) => ProximityWarningDialog(
+          nearbyNodes: nearbyNodes,
+          distance: kNodeProximityWarningDistance,
+          onGoBack: () {
+            Navigator.of(context).pop(); // Close dialog
+          },
+          onSubmitAnyway: () {
+            Navigator.of(context).pop(); // Close dialog
+            _commitWithoutCheck(context, appState, locService);
+          },
+        ),
+      );
+    } else {
+      // No nearby nodes, proceed with commit
+      _commitWithoutCheck(context, appState, locService);
+    }
+  }
+
+  void _commitWithoutCheck(BuildContext context, AppState appState, LocalizationService locService) {
+    appState.commitEditSession();
+    Navigator.pop(context);
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(locService.t('node.editQueuedForUpload'))),
+    );
+  }
+
   Widget _buildDirectionControls(BuildContext context, AppState appState, EditNodeSession session, LocalizationService locService) {
     final requiresDirection = session.profile != null && session.profile!.requiresDirection;
     
@@ -146,11 +186,7 @@ class EditNodeSheet extends StatelessWidget {
         final appState = context.watch<AppState>();
 
         void _commit() {
-          appState.commitEditSession();
-          Navigator.pop(context);
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text(locService.t('node.editQueuedForUpload'))),
-          );
+          _checkProximityAndCommit(context, appState, locService);
         }
 
         void _cancel() {

lib/widgets/proximity_warning_dialog.dart

@@ -0,0 +1,126 @@
+import 'package:flutter/material.dart';
+import 'package:latlong2/latlong.dart';
+
+import '../models/osm_node.dart';
+import '../services/localization_service.dart';
+
+class ProximityWarningDialog extends StatelessWidget {
+  final List<OsmNode> nearbyNodes;
+  final double distance;
+  final VoidCallback onGoBack;
+  final VoidCallback onSubmitAnyway;
+
+  const ProximityWarningDialog({
+    super.key,
+    required this.nearbyNodes,
+    required this.distance,
+    required this.onGoBack,
+    required this.onSubmitAnyway,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: LocalizationService.instance,
+      builder: (context, child) {
+        final locService = LocalizationService.instance;
+        
+        return AlertDialog(
+          icon: const Icon(
+            Icons.warning_amber_rounded,
+            color: Colors.orange,
+            size: 32,
+          ),
+          title: Text(locService.t('proximityWarning.title')),
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                locService.t('proximityWarning.message', 
+                  params: [distance.toStringAsFixed(1)]),
+                style: Theme.of(context).textTheme.bodyMedium,
+              ),
+              const SizedBox(height: 16),
+              Text(
+                locService.t('proximityWarning.suggestion'),
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+              const SizedBox(height: 16),
+              Text(
+                locService.t('proximityWarning.nearbyNodes', 
+                  params: [nearbyNodes.length.toString()]),
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+              const SizedBox(height: 8),
+              ...nearbyNodes.take(3).map((node) => Padding(
+                padding: const EdgeInsets.only(left: 8.0, bottom: 4.0),
+                child: Text(
+                  '• ${locService.t('proximityWarning.nodeInfo', params: [
+                    node.id.toString(),
+                    _getNodeTypeDescription(node, locService),
+                  ])}',
+                  style: Theme.of(context).textTheme.bodySmall,
+                ),
+              )),
+              if (nearbyNodes.length > 3)
+                Padding(
+                  padding: const EdgeInsets.only(left: 8.0, top: 4.0),
+                  child: Text(
+                    locService.t('proximityWarning.andMore', 
+                      params: [(nearbyNodes.length - 3).toString()]),
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+            ],
+          ),
+          actions: [
+            TextButton(
+              onPressed: onGoBack,
+              child: Text(locService.t('proximityWarning.goBack')),
+            ),
+            ElevatedButton(
+              onPressed: onSubmitAnyway,
+              style: ElevatedButton.styleFrom(
+                backgroundColor: Colors.orange,
+                foregroundColor: Colors.white,
+              ),
+              child: Text(locService.t('proximityWarning.submitAnyway')),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  String _getNodeTypeDescription(OsmNode node, LocalizationService locService) {
+    // Try to get a meaningful description from the node's tags
+    final manMade = node.tags['man_made'];
+    final amenity = node.tags['amenity'];
+    final surveillance = node.tags['surveillance'];
+    final surveillanceType = node.tags['surveillance:type'];
+    final manufacturer = node.tags['manufacturer'];
+    
+    if (manMade == 'surveillance') {
+      if (surveillanceType == 'ALPR' || surveillanceType == 'ANPR') {
+        return locService.t('proximityWarning.nodeType.alpr');
+      } else if (surveillance == 'public') {
+        return locService.t('proximityWarning.nodeType.publicCamera');
+      } else {
+        return locService.t('proximityWarning.nodeType.camera');
+      }
+    } else if (amenity != null) {
+      return locService.t('proximityWarning.nodeType.amenity', params: [amenity]);
+    } else if (manufacturer != null) {
+      return locService.t('proximityWarning.nodeType.device', params: [manufacturer]);
+    } else {
+      return locService.t('proximityWarning.nodeType.unknown');
+    }
+  }
+}