Implement last heard display on device details

lib/models/last_heard_item.dart

@@ -58,37 +58,55 @@ class LastHeardItem {
   });
 
   factory LastHeardItem.fromJson(Map<String, dynamic> json) {
+    int? _toInt(dynamic value) {
+      if (value == null) return null;
+      if (value is int) return value;
+      if (value is double) return value.toInt();
+      if (value is String) return int.tryParse(value);
+      return null;
+    }
+
+    String _toString(dynamic value) {
+      if (value == null) return '';
+      return value.toString();
+    }
+
+    String? _toStringOrNull(dynamic value) {
+      if (value == null) return null;
+      return value.toString();
+    }
+
     return LastHeardItem(
-      linkName: json['LinkName'] as String? ?? '',
+      linkName: _toString(json['LinkName']),
-      sessionID: json['SessionID'] as String? ?? '',
+      sessionID: _toString(json['SessionID']),
-      linkType: json['LinkType'] as int? ?? 0,
+      linkType: _toInt(json['LinkType']) ?? 0,
-      contextID: json['ContextID'] as int? ?? 0,
+      contextID: _toInt(json['ContextID']) ?? 0,
-      sessionType: json['SessionType'] as int? ?? 0,
+      sessionType: _toInt(json['SessionType']) ?? 0,
-      slot: json['Slot'] as int? ?? 0,
+      slot: _toInt(json['Slot']) ?? 0,
-      sourceID: json['SourceID'] as int? ?? 0,
+      sourceID: _toInt(json['SourceID']) ?? 0,
-      destinationID: json['DestinationID'] as int? ?? 0,
+      destinationID: _toInt(json['DestinationID']) ?? 0,
-      route: json['Route'] as String? ?? '',
+      route: _toString(json['Route']),
-      linkCall: json['LinkCall'] as String? ?? '',
+      linkCall: _toString(json['LinkCall']),
-      sourceCall: json['SourceCall'] as String? ?? '',
+      sourceCall: _toString(json['SourceCall']),
-      sourceName: json['SourceName'] as String?,
+      sourceName: _toStringOrNull(json['SourceName']),
-      destinationCall: json['DestinationCall'] as String? ?? '',
+      destinationCall: _toString(json['DestinationCall']),
-      destinationName: json['DestinationName'] as String?,
+      destinationName: _toStringOrNull(json['DestinationName']),
-      start: json['Start'] as int? ?? 0,
+      start: _toInt(json['Start']) ?? 0,
-      stop: json['Stop'] as int? ?? 0,
+      stop: _toInt(json['Stop']) ?? 0,
-      rssi: json['RSSI'] as int?,
+      rssi: _toInt(json['RSSI']),
-      ber: json['BER'] as int?,
+      ber: _toInt(json['BER']),
-      reflectorID: json['ReflectorID'] as int? ?? 0,
+      reflectorID: _toInt(json['ReflectorID']) ?? 0,
-      linkTypeName: json['LinkTypeName'] as String? ?? '',
+      linkTypeName: _toString(json['LinkTypeName']),
       callTypes: (json['CallTypes'] as List<dynamic>?)
-              ?.map((e) => e as String)
+              ?.map((e) => e.toString())
               .toList() ??
           [],
-      lossCount: json['LossCount'] as int? ?? 0,
+      lossCount: _toInt(json['LossCount']) ?? 0,
-      totalCount: json['TotalCount'] as int? ?? 0,
+      totalCount: _toInt(json['TotalCount']) ?? 0,
-      master: json['Master'] as String? ?? '',
+      master: _toString(json['Master']),
-      talkerAlias: json['TalkerAlias'] as String?,
+      talkerAlias: _toStringOrNull(json['TalkerAlias']),
-      flagSet: json['FlagSet'] as int? ?? 0,
+      flagSet: _toInt(json['FlagSet']) ?? 0,
-      event: json['Event'] as String? ?? '',
+      event: _toString(json['Event']),
     );
   }
 

lib/views/device_detail_view.dart

@@ -1,12 +1,15 @@
 import 'dart:async';
+import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../models/device.dart';
 import '../models/static_talkgroup.dart';
 import '../models/device_profile.dart';
+import '../models/last_heard_item.dart';
 import '../services/authentication_manager.dart';
 import '../services/brandmeister_client.dart';
 import '../services/brandmeister_websocket_client.dart';
+import '../services/lastheard_websocket_client.dart';
 import 'link_talkgroup_view.dart';
 
 class DeviceDetailView extends StatefulWidget {
@@ -30,17 +33,25 @@ class _DeviceDetailViewState extends State<DeviceDetailView> {
   StreamSubscription<Map<String, dynamic>>? _wsSubscription;
   int? _autoStaticTalkgroup;
 
+  LastHeardWebSocketClient? _lhWsClient;
+  StreamSubscription<Map<String, dynamic>>? _lhWsSubscription;
+  final List<LastHeardItem> _lastHeardItems = [];
+  static const int _maxLastHeardItems = 20;
+
   @override
   void initState() {
     super.initState();
     _loadData();
     _connectWebSocket();
+    _connectLastHeardWebSocket();
   }
 
   @override
   void dispose() {
     _wsSubscription?.cancel();
     _wsClient?.dispose();
+    _lhWsSubscription?.cancel();
+    _lhWsClient?.dispose();
     super.dispose();
   }
 
@@ -90,6 +101,96 @@ class _DeviceDetailViewState extends State<DeviceDetailView> {
     }
   }
 
+  Future<void> _connectLastHeardWebSocket() async {
+    try {
+      _lhWsClient = LastHeardWebSocketClient();
+      _lhWsClient!.connect();
+
+      _lhWsSubscription = _lhWsClient!.messageStream.listen((message) {
+        if (message['event'] == 'mqtt' && message['data'] is Map) {
+          _handleLastHeardMessage(message['data'] as Map<String, dynamic>);
+        }
+      });
+    } catch (e) {
+      debugPrint('DeviceDetailView: Error connecting to Last Heard WebSocket: $e');
+    }
+  }
+
+  void _handleLastHeardMessage(Map<String, dynamic> data) {
+    try {
+      final topic = data['topic'] as String?;
+      if (topic == 'LH') {
+        final payloadStr = data['payload'] as String?;
+        if (payloadStr == null) return;
+
+        final payload = jsonDecode(payloadStr) as Map<String, dynamic>;
+        final destinationId = payload['DestinationID'] as int?;
+
+        if (destinationId == null) return;
+
+        // Get all linked talkgroup IDs (static + auto-static + dynamic)
+        final linkedTalkgroupIds = <int>{};
+
+        // Add static talkgroups
+        for (final tg in _deviceProfile?.staticSubscriptions ?? <StaticTalkgroup>[]) {
+          if (tg.talkgroup != null) {
+            final tgId = int.tryParse(tg.talkgroup!);
+            if (tgId != null) {
+              linkedTalkgroupIds.add(tgId);
+            }
+          }
+        }
+
+        // Add dynamic/auto-static talkgroups from device profile
+        for (final tg in _deviceProfile?.dynamicSubscriptions ?? <StaticTalkgroup>[]) {
+          if (tg.talkgroup != null) {
+            final tgId = int.tryParse(tg.talkgroup!);
+            if (tgId != null) {
+              linkedTalkgroupIds.add(tgId);
+            }
+          }
+        }
+
+        // Add auto-static talkgroup from WebSocket (if available)
+        if (_autoStaticTalkgroup != null) {
+          linkedTalkgroupIds.add(_autoStaticTalkgroup!);
+        }
+
+        debugPrint('DeviceDetailView: Linked talkgroups: $linkedTalkgroupIds, Destination: $destinationId');
+
+        // Only process if this message is for one of our linked talkgroups
+        if (linkedTalkgroupIds.contains(destinationId)) {
+          debugPrint('DeviceDetailView: Match found! Adding to last heard list');
+          final item = LastHeardItem.fromJson(payload);
+
+          debugPrint('DeviceDetailView: Item - TalkerAlias: ${item.talkerAlias}, SourceCall: ${item.sourceCall}, DestName: ${item.destinationName}, DestCall: ${item.destinationCall}');
+
+          if (item.sourceCall.isEmpty) {
+            debugPrint('DeviceDetailView: Ignoring item with empty SourceCall');
+            return;
+          }
+
+          if (mounted) {
+            setState(() {
+              // Remove any existing item with the same sourceID
+              _lastHeardItems.removeWhere((existing) => existing.sourceID == item.sourceID);
+
+              // Add the new item at the beginning
+              _lastHeardItems.insert(0, item);
+
+              // Keep only the latest 20 items
+              if (_lastHeardItems.length > _maxLastHeardItems) {
+                _lastHeardItems.removeRange(_maxLastHeardItems, _lastHeardItems.length);
+              }
+            });
+          }
+        }
+      }
+    } catch (e) {
+      debugPrint('DeviceDetailView: Error handling Last Heard message: $e');
+    }
+  }
+
   Future<void> _loadData() async {
     setState(() {
       _isLoadingTalkgroups = true;
@@ -275,6 +376,10 @@ class _DeviceDetailViewState extends State<DeviceDetailView> {
       children: [
         _buildDeviceInfoSection(),
         const Divider(height: 1),
+        if (_lastHeardItems.isNotEmpty) ...[
+          _buildLastHeardSection(),
+          const Divider(height: 1),
+        ],
         _buildTalkgroupsSection(),
       ],
     );
@@ -326,6 +431,83 @@ class _DeviceDetailViewState extends State<DeviceDetailView> {
     );
   }
 
+  Widget _buildLastHeardSection() {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text(
+                'Last Heard on Talkgroup',
+                style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                      fontWeight: FontWeight.bold,
+                    ),
+              ),
+              Container(
+                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
+                decoration: BoxDecoration(
+                  color: Theme.of(context).colorScheme.primaryContainer,
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Text(
+                  '${_lastHeardItems.length}',
+                  style: TextStyle(
+                    color: Theme.of(context).colorScheme.onPrimaryContainer,
+                    fontSize: 12,
+                    fontWeight: FontWeight.bold,
+                  ),
+                ),
+              ),
+            ],
+          ),
+          const SizedBox(height: 16),
+          ..._lastHeardItems.map((item) => Card(
+                margin: const EdgeInsets.only(bottom: 8),
+                child: ListTile(
+                  leading: CircleAvatar(
+                    backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
+                    child: Text(
+                      'TS${item.slot}',
+                      style: TextStyle(
+                        fontSize: 11,
+                        fontWeight: FontWeight.bold,
+                        color: Theme.of(context).colorScheme.onSecondaryContainer,
+                      ),
+                    ),
+                  ),
+                  title: Text(item.talkerAlias ?? item.sourceCall),
+                  subtitle: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text('ID: ${item.sourceID}'),
+                      Text('TG: ${item.destinationID}'),
+                      Text(
+                        '${item.timeAgo} • ${item.linkTypeName}',
+                        style: TextStyle(
+                          fontSize: 11,
+                          color: Colors.grey[600],
+                        ),
+                      ),
+                    ],
+                  ),
+                  trailing: item.event == 'Session-Start'
+                      ? Icon(
+                          Icons.mic,
+                          color: Theme.of(context).colorScheme.primary,
+                          size: 20,
+                        )
+                      : null,
+                  isThreeLine: true,
+                ),
+              )),
+        ],
+      ),
+    );
+  }
+
   Widget _buildTalkgroupsSection() {
     final hasAnyTalkgroups = _talkgroups.isNotEmpty ||
         (_deviceProfile?.staticSubscriptions.isNotEmpty ?? false) ||