Merge pull request #444 from sethoscope/fix-channel-chat-icon

Use correct channel icons in channel chat screen

lib/models/channel.dart

@@ -4,6 +4,9 @@ import 'dart:typed_data';
 import 'package:crypto/crypto.dart' as crypto;
 
 import '../connector/meshcore_protocol.dart';
+import 'community.dart';
+
+enum ChannelType { public, private, hashtag, communityPublic, communityHashtag }
 
 class Channel {
   final int index;
@@ -111,5 +114,36 @@ class Channel {
     return bytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
   }
 
+  static bool isCommunityChannel(ChannelType channelType) {
+    switch (channelType) {
+      case ChannelType.communityPublic:
+      case ChannelType.communityHashtag:
+        return true;
+      case ChannelType.public:
+      case ChannelType.private:
+      case ChannelType.hashtag:
+        return false;
+    }
+  }
+
+  static ChannelType getChannelType(
+    Channel channel,
+    CommunityPskIndex communityIndex,
+  ) {
+    Community? community = communityIndex.getCommunityForChannel(channel);
+    if (community != null) {
+      if (Community.isCommunityPublicChannel(channel, community)) {
+        return ChannelType.communityPublic;
+      }
+      return ChannelType.communityHashtag;
+    }
+    if (channel.isPublicChannel) {
+      return ChannelType.public;
+    } else if (channel.name.startsWith('#')) {
+      return ChannelType.hashtag;
+    }
+    return ChannelType.private;
+  }
+
   static const String publicChannelPsk = '8b3387e9c5cdea6ac9e5edbaa115cd72';
 }

lib/models/community.dart

@@ -4,6 +4,8 @@ import 'dart:typed_data';
 
 import 'package:crypto/crypto.dart' as crypto;
 
+import 'channel.dart';
+
 /// Represents a community with a shared secret for deriving channel PSKs.
 ///
 /// A Community is a namespace with a shared secret K (32 random bytes),
@@ -162,6 +164,12 @@ class Community {
     return hashtag.replaceFirst(RegExp(r'^#'), '').toLowerCase().trim();
   }
 
+  /// Returns true if this is the community's public channel
+  static bool isCommunityPublicChannel(Channel channel, Community community) {
+    final publicPsk = community.deriveCommunityPublicPsk();
+    return channel.pskHex == Channel.formatPskHex(publicPsk);
+  }
+
   /// Add a hashtag channel to this community's list
   Community addHashtagChannel(String hashtag) {
     final normalized = _normalizeCommunityHashtag(hashtag);
@@ -237,3 +245,28 @@ class Community {
   @override
   int get hashCode => id.hashCode;
 }
+
+class CommunityPskIndex {
+  // Cache of PSK hex -> Community for quick lookup
+  final Map<String, Community> _pskToCommunity = {};
+
+  void initialize(List<Community> communities) {
+    _pskToCommunity.clear();
+    for (final community in communities) {
+      // Map the community public channel PSK
+      final publicPsk = community.deriveCommunityPublicPsk();
+      _pskToCommunity[Channel.formatPskHex(publicPsk)] = community;
+
+      // Map all known hashtag channel PSKs
+      for (final hashtag in community.hashtagChannels) {
+        final hashtagPsk = community.deriveCommunityHashtagPsk(hashtag);
+        _pskToCommunity[Channel.formatPskHex(hashtagPsk)] = community;
+      }
+    }
+  }
+
+  /// Returns the community this channel belongs to, or null if not a community channel
+  Community? getCommunityForChannel(Channel channel) {
+    return _pskToCommunity[channel.pskHex];
+  }
+}

lib/screens/channel_chat_screen.dart

@@ -8,6 +8,8 @@ import 'package:intl/intl.dart';
 import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
+import '../models/community.dart';
+import '../storage/community_store.dart';
 import '../utils/platform_info.dart';
 import '../helpers/chat_scroll_controller.dart';
 import '../connector/meshcore_protocol.dart';
@@ -56,8 +58,11 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
   final ChatScrollController _scrollController = ChatScrollController();
   final FocusNode _textFieldFocusNode = FocusNode();
   ChannelMessage? _replyingToMessage;
+  final CommunityStore _communityStore = CommunityStore();
+  final CommunityPskIndex _communityIndex = CommunityPskIndex();
   final Map<String, GlobalKey> _messageKeys = {};
   bool _isLoadingOlder = false;
+  bool _communitiesLoaded = false;
 
   MeshCoreConnector? _connector;
   DateTime? _lastChannelSendAt;
@@ -81,6 +86,7 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
       final idx = widget.channel.index;
       final unread = widget.initialUnreadCount;
       final messages = connector.getChannelMessages(widget.channel);
+      _loadCommunities();
       ChannelMessage? anchor;
       if (unread > 0) {
         anchor = _findOldestUnreadChannelAnchor(messages, unread);
@@ -107,6 +113,19 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     });
   }
 
+  // TODO: Reload communities when returning from another screen
+  Future<void> _loadCommunities() async {
+    final connector = context.read<MeshCoreConnector>();
+    _communityStore.setPublicKeyHex = connector.selfPublicKeyHex;
+    final communities = await _communityStore.loadCommunities();
+    if (mounted) {
+      setState(() {
+        _communityIndex.initialize(communities);
+        _communitiesLoaded = true;
+      });
+    }
+  }
+
   ChannelMessage? _findOldestUnreadChannelAnchor(
     List<ChannelMessage> messages,
     int unreadCount,
@@ -193,16 +212,63 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     );
   }
 
+  Widget _channelIcon(Channel channel) {
+    // Determine icon based on channel type
+    final ChannelType channelType = Channel.getChannelType(
+      channel,
+      _communityIndex,
+    );
+    final bool isCommunityChannel = Channel.isCommunityChannel(channelType);
+    IconData icon;
+    switch (channelType) {
+      case ChannelType.communityPublic:
+        icon = Icons.groups;
+      case ChannelType.communityHashtag:
+        icon = Icons.tag;
+      case ChannelType.public:
+        icon = Icons.public;
+      case ChannelType.hashtag:
+        icon = Icons.tag;
+      case ChannelType.private:
+        icon = Icons.lock;
+    }
+    return Stack(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(vertical: 3),
+          child: _communitiesLoaded
+              ? Icon(icon, size: 20)
+              : SizedBox.square(dimension: 20),
+        ),
+        if (isCommunityChannel)
+          Positioned(
+            right: 0,
+            bottom: 0,
+            child: Container(
+              width: 12,
+              height: 12,
+              decoration: BoxDecoration(
+                color: Colors.purple,
+                shape: BoxShape.circle,
+                border: Border.all(
+                  color: Theme.of(context).cardColor,
+                  width: 2,
+                ),
+              ),
+              child: const Icon(Icons.people, size: 8, color: Colors.white),
+            ),
+          ),
+      ],
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: Row(
           children: [
-            Icon(
+            _channelIcon(widget.channel),
-              widget.channel.isPublicChannel ? Icons.public : Icons.tag,
-              size: 20,
-            ),
             const SizedBox(width: 8),
             Expanded(
               child: Column(

lib/screens/channels_screen.dart

@@ -44,11 +44,9 @@ class _ChannelsScreenState extends State<ChannelsScreen>
     with DisconnectNavigationMixin {
   final TextEditingController _searchController = TextEditingController();
   final CommunityStore _communityStore = CommunityStore();
-  Timer? _searchDebounce;
+  final CommunityPskIndex _communityIndex = CommunityPskIndex();
   List<Community> _communities = [];
-
+  Timer? _searchDebounce;
-  // Cache of PSK hex -> Community for quick lookup
-  final Map<String, Community> _pskToCommunity = {};
 
   ChannelMessageStore get _channelMessageStore => ChannelMessageStore();
 
@@ -71,37 +69,11 @@ class _ChannelsScreenState extends State<ChannelsScreen>
     if (mounted) {
       setState(() {
         _communities = communities;
-        _buildPskCommunityMap();
+        _communityIndex.initialize(communities);
       });
     }
   }
 
-  void _buildPskCommunityMap() {
-    _pskToCommunity.clear();
-    for (final community in _communities) {
-      // Map the community public channel PSK
-      final publicPsk = community.deriveCommunityPublicPsk();
-      _pskToCommunity[Channel.formatPskHex(publicPsk)] = community;
-
-      // Map all known hashtag channel PSKs
-      for (final hashtag in community.hashtagChannels) {
-        final hashtagPsk = community.deriveCommunityHashtagPsk(hashtag);
-        _pskToCommunity[Channel.formatPskHex(hashtagPsk)] = community;
-      }
-    }
-  }
-
-  /// Returns the community this channel belongs to, or null if not a community channel
-  Community? _getCommunityForChannel(Channel channel) {
-    return _pskToCommunity[channel.pskHex];
-  }
-
-  /// Returns true if this is the community's public channel
-  bool _isCommunityPublicChannel(Channel channel, Community community) {
-    final publicPsk = community.deriveCommunityPublicPsk();
-    return channel.pskHex == Channel.formatPskHex(publicPsk);
-  }
-
   @override
   void dispose() {
     _searchDebounce?.cancel();
@@ -377,34 +349,34 @@ class _ChannelsScreenState extends State<ChannelsScreen>
     int? dragIndex,
   }) {
     final unreadCount = connector.getUnreadCountForChannel(channel);
-    final community = _getCommunityForChannel(channel);
-    final isCommunityChannel = community != null;
-    final isCommunityPublic =
-        isCommunityChannel && _isCommunityPublicChannel(channel, community);
 
     // Determine icon and colors based on channel type
     IconData icon;
     Color iconColor;
     Color bgColor;
-
+    final ChannelType channelType = Channel.getChannelType(
-    if (isCommunityChannel) {
+      channel,
-      // Community channel styling
+      _communityIndex,
+    );
+    final bool isCommunityChannel = Channel.isCommunityChannel(channelType);
+    switch (channelType) {
+      case ChannelType.communityPublic:
+        icon = Icons.groups;
         iconColor = Colors.purple;
         bgColor = Colors.purple.withValues(alpha: 0.2);
-      if (isCommunityPublic) {
+      case ChannelType.communityHashtag:
-        icon = Icons.groups;
-      } else {
         icon = Icons.tag;
-      }
+        iconColor = Colors.purple;
-    } else if (channel.isPublicChannel) {
+        bgColor = Colors.purple.withValues(alpha: 0.2);
+      case ChannelType.public:
         icon = Icons.public;
         iconColor = Colors.green;
         bgColor = Colors.green.withValues(alpha: 0.2);
-    } else if (channel.name.startsWith('#')) {
+      case ChannelType.hashtag:
         icon = Icons.tag;
         iconColor = Colors.blue;
         bgColor = Colors.blue.withValues(alpha: 0.2);
-    } else {
+      case ChannelType.private:
         icon = Icons.lock;
         iconColor = Colors.blue;
         bgColor = Colors.blue.withValues(alpha: 0.2);