Add accepted leg edit notification and class leaderboard

lib/components/pages/traction/traction_page.dart

@@ -33,6 +33,14 @@ class _TractionPageState extends State<TractionPage> {
   String? _classStatsError;
   String? _classStatsForClass;
   Map<String, dynamic>? _classStats;
+  bool _showClassLeaderboardPanel = false;
+  bool _classLeaderboardLoading = false;
+  String? _classLeaderboardError;
+  String? _classLeaderboardForClass;
+  String? _classFriendsLeaderboardForClass;
+  List<LeaderboardEntry> _classLeaderboard = [];
+  List<LeaderboardEntry> _classFriendsLeaderboard = [];
+  _ClassLeaderboardScope _classLeaderboardScope = _ClassLeaderboardScope.global;
 
   final Map<String, TextEditingController> _dynamicControllers = {};
   final Map<String, String?> _enumSelections = {};
@@ -211,6 +219,13 @@ class _TractionPageState extends State<TractionPage> {
       _classStats = null;
       _classStatsError = null;
       _classStatsForClass = null;
+      _showClassLeaderboardPanel = false;
+      _classLeaderboard = [];
+      _classFriendsLeaderboard = [];
+      _classLeaderboardError = null;
+      _classLeaderboardForClass = null;
+      _classFriendsLeaderboardForClass = null;
+      _classLeaderboardScope = _ClassLeaderboardScope.global;
     });
     _refreshTraction();
   }
@@ -223,6 +238,7 @@ class _TractionPageState extends State<TractionPage> {
       });
     }
     _refreshClassStatsIfOpen();
+    _refreshClassLeaderboardIfOpen();
   }
 
   List<EventField> _activeEventFields(List<EventField> fields) {
@@ -405,6 +421,7 @@ class _TractionPageState extends State<TractionPage> {
                             });
                             _refreshTraction();
                             _refreshClassStatsIfOpen(immediate: true);
+                            _refreshClassLeaderboardIfOpen(immediate: true);
                           },
                         ),
                       ),
@@ -518,6 +535,19 @@ class _TractionPageState extends State<TractionPage> {
           ),
         ),
       ),
+      SliverPadding(
+        padding: const EdgeInsets.fromLTRB(16, 0, 16, 8),
+        sliver: SliverToBoxAdapter(
+          child: AnimatedCrossFade(
+            crossFadeState: (_showClassLeaderboardPanel && _hasClassQuery)
+                ? CrossFadeState.showFirst
+                : CrossFadeState.showSecond,
+            duration: const Duration(milliseconds: 200),
+            firstChild: _buildClassLeaderboardCard(context),
+            secondChild: const SizedBox.shrink(),
+          ),
+        ),
+      ),
       SliverPadding(
         padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
         sliver: _buildTractionSliver(context, data, traction),
@@ -587,6 +617,17 @@ class _TractionPageState extends State<TractionPage> {
               _showClassStatsPanel ? 'Hide class stats' : 'Class stats',
             ),
           );
+    final classLeaderboardButton = !_hasClassQuery
+        ? null
+        : FilledButton.tonalIcon(
+            onPressed: _toggleClassLeaderboardPanel,
+            icon: Icon(
+              _showClassLeaderboardPanel ? Icons.emoji_events : Icons.leaderboard,
+            ),
+            label: Text(
+              _showClassLeaderboardPanel ? 'Hide class leaderboard' : 'Class leaderboard',
+            ),
+          );
 
     final newTractionButton = !isElevated
         ? null
@@ -611,12 +652,14 @@ class _TractionPageState extends State<TractionPage> {
     final desktopActions = [
       refreshButton,
       if (classStatsButton != null) classStatsButton,
+      if (classLeaderboardButton != null) classLeaderboardButton,
       if (newTractionButton != null) newTractionButton,
     ];
 
     final mobileActions = [
       if (newTractionButton != null) newTractionButton,
       if (classStatsButton != null) classStatsButton,
+      if (classLeaderboardButton != null) classLeaderboardButton,
       refreshButton,
     ];
 
@@ -944,6 +987,42 @@ class _TractionPageState extends State<TractionPage> {
     return total;
   }
 
+  Widget _placementBadge(BuildContext context, int index) {
+    const size = 32.0;
+    const iconSize = 18.0;
+    if (index == 0) {
+      return CircleAvatar(
+        radius: size / 2,
+        backgroundColor: Colors.amber.shade400,
+        child: const Icon(Icons.emoji_events, color: Colors.white, size: iconSize),
+      );
+    }
+    if (index == 1) {
+      return CircleAvatar(
+        radius: size / 2,
+        backgroundColor: Colors.blueGrey.shade200,
+        child: const Icon(Icons.emoji_events, color: Colors.white, size: iconSize),
+      );
+    }
+    if (index == 2) {
+      return CircleAvatar(
+        radius: size / 2,
+        backgroundColor: Colors.brown.shade300,
+        child: const Icon(Icons.emoji_events, color: Colors.white, size: iconSize),
+      );
+    }
+    return CircleAvatar(
+      radius: size / 2,
+      backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
+      child: Text(
+        '${index + 1}',
+        style: Theme.of(context).textTheme.labelLarge?.copyWith(
+              fontWeight: FontWeight.w800,
+            ),
+      ),
+    );
+  }
+
   Color _statusColor(String status, ColorScheme scheme) {
     final key = status.toLowerCase();
     if (key.contains('scrap')) return Colors.red.shade600;
@@ -1150,4 +1229,212 @@ class _TractionPageState extends State<TractionPage> {
       ),
     );
   }
+
+  Future<void> _toggleClassLeaderboardPanel() async {
+    if (!_hasClassQuery) return;
+    final targetState = !_showClassLeaderboardPanel;
+    setState(() {
+      _showClassLeaderboardPanel = targetState;
+    });
+    if (targetState) {
+      await _loadClassLeaderboard(friends: _classLeaderboardScope == _ClassLeaderboardScope.friends);
+    }
+  }
+
+  void _refreshClassLeaderboardIfOpen({bool immediate = false}) {
+    if (!_showClassLeaderboardPanel || !_hasClassQuery) return;
+    final query = (_selectedClass ?? _classController.text).trim();
+    final scope = _classLeaderboardScope;
+    final currentData = scope == _ClassLeaderboardScope.global
+        ? _classLeaderboard
+        : _classFriendsLeaderboard;
+    final currentClass = scope == _ClassLeaderboardScope.global
+        ? _classLeaderboardForClass
+        : _classFriendsLeaderboardForClass;
+    if (!immediate && currentClass == query && currentData.isNotEmpty) {
+      return;
+    }
+    _loadClassLeaderboard(
+      friends: scope == _ClassLeaderboardScope.friends,
+    );
+  }
+
+  Future<void> _loadClassLeaderboard({required bool friends}) async {
+    final query = (_selectedClass ?? _classController.text).trim();
+    if (query.isEmpty) return;
+    final currentClass = friends ? _classFriendsLeaderboardForClass : _classLeaderboardForClass;
+    final currentData = friends ? _classFriendsLeaderboard : _classLeaderboard;
+    if (currentClass == query && currentData.isNotEmpty) return;
+    setState(() {
+      _classLeaderboardLoading = true;
+      _classLeaderboardError = null;
+      if (friends && _classFriendsLeaderboardForClass != query) {
+        _classFriendsLeaderboard = [];
+      } else if (!friends && _classLeaderboardForClass != query) {
+        _classLeaderboard = [];
+      }
+    });
+    try {
+      final data = context.read<DataService>();
+      final leaderboard = await data.fetchClassLeaderboard(
+        query,
+        friends: friends,
+      );
+      if (!mounted) return;
+      setState(() {
+        if (friends) {
+          _classFriendsLeaderboard = leaderboard;
+          _classFriendsLeaderboardForClass = query;
+        } else {
+          _classLeaderboard = leaderboard;
+          _classLeaderboardForClass = query;
+        }
+        _classLeaderboardError = null;
+      });
+    } catch (e) {
+      if (!mounted) return;
+      setState(() {
+        _classLeaderboardError = 'Failed to load class leaderboard: $e';
+      });
+    } finally {
+      if (mounted) {
+        setState(() {
+          _classLeaderboardLoading = false;
+        });
+      }
+    }
+  }
+
+  Widget _buildClassLeaderboardCard(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    final distanceUnits = context.watch<DistanceUnitService>();
+    final leaderboard = _classLeaderboardScope == _ClassLeaderboardScope.global
+        ? _classLeaderboard
+        : _classFriendsLeaderboard;
+    final loading = _classLeaderboardLoading;
+    final error = _classLeaderboardError;
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Expanded(
+                  child: Text(
+                    (_selectedClass ?? _classController.text).trim().isEmpty
+                        ? 'Class leaderboard'
+                        : '${(_selectedClass ?? _classController.text).trim()} leaderboard',
+                    style: Theme.of(context).textTheme.titleMedium,
+                  ),
+                ),
+                SegmentedButton<_ClassLeaderboardScope>(
+                  segments: const [
+                    ButtonSegment(
+                      value: _ClassLeaderboardScope.global,
+                      label: Text('Global'),
+                    ),
+                    ButtonSegment(
+                      value: _ClassLeaderboardScope.friends,
+                      label: Text('Friends'),
+                    ),
+                  ],
+                  selected: {_classLeaderboardScope},
+                  onSelectionChanged: (vals) async {
+                    if (vals.isEmpty) return;
+                    final selected = vals.first;
+                    setState(() => _classLeaderboardScope = selected);
+                    if (selected == _ClassLeaderboardScope.friends &&
+                        _classFriendsLeaderboard.isEmpty &&
+                        !_classLeaderboardLoading) {
+                      await _loadClassLeaderboard(friends: true);
+                    } else if (selected == _ClassLeaderboardScope.global &&
+                        _classLeaderboard.isEmpty &&
+                        !_classLeaderboardLoading) {
+                      await _loadClassLeaderboard(friends: false);
+                    }
+                  },
+                  style: SegmentedButton.styleFrom(
+                    visualDensity: VisualDensity.compact,
+                    padding: const EdgeInsets.symmetric(horizontal: 8),
+                  ),
+                ),
+                const SizedBox(width: 8),
+                IconButton(
+                  tooltip: 'Refresh leaderboard',
+                  icon: const Icon(Icons.refresh),
+                  onPressed: () => _loadClassLeaderboard(
+                    friends: _classLeaderboardScope == _ClassLeaderboardScope.friends,
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 12),
+            if (loading)
+              Row(
+                children: const [
+                  SizedBox(
+                    height: 16,
+                    width: 16,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  ),
+                  SizedBox(width: 12),
+                  Text('Loading leaderboard...'),
+                ],
+              )
+            else if (error != null)
+              Text(
+                error,
+                style: TextStyle(color: scheme.error),
+              )
+            else if (leaderboard.isEmpty)
+              const Text('No leaderboard data yet.')
+            else
+              Column(
+                children: [
+                  for (int i = 0; i < leaderboard.length; i++) ...[
+                    ListTile(
+                      contentPadding: EdgeInsets.zero,
+                      dense: true,
+                      leading: _placementBadge(context, i),
+                      title: Text(
+                        leaderboard[i].userFullName,
+                        style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
+                      ),
+                      trailing: Text(
+                        distanceUnits.format(
+                          leaderboard[i].mileage,
+                          decimals: 1,
+                        ),
+                        style: Theme.of(context).textTheme.labelLarge?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
+                      ),
+                      onTap: () {
+                        final auth = context.read<AuthService>();
+                        final userId = leaderboard[i].userId;
+                        if (auth.userId == userId) {
+                          context.go('/more/profile');
+                        } else {
+                          context.pushNamed(
+                            'user-profile',
+                            queryParameters: {'user_id': userId},
+                          );
+                        }
+                      },
+                    ),
+                    if (i != leaderboard.length - 1) const Divider(height: 12),
+                  ],
+                ],
+              ),
+          ],
+        ),
+      ),
+    );
+  }
 }
+
+enum _ClassLeaderboardScope { global, friends }