feat: Implement group management features with Firestore integration and loading states

lib/components/group/group_content.dart

@@ -1,27 +1,126 @@
 import 'package:flutter/material.dart';
+import 'package:travel_mate/models/group.dart';
+import 'package:provider/provider.dart';
+import '../../providers/user_provider.dart';
+import '../../services/group_service.dart';
 
-class GroupContent extends StatelessWidget {
+class GroupContent extends StatefulWidget {
   const GroupContent({super.key});
 
+  @override
+  State<GroupContent> createState() => _GroupContentState();
+}
+
+class _GroupContentState extends State<GroupContent> {
+
   @override
   Widget build(BuildContext context) {
+    return Scaffold(
+      body: Consumer<UserProvider>(
+        builder: (context, userProvider, child) {
+          final user = userProvider.currentUser;
+          if (user == null || user.id == null) {
             return const Center(
+              child: Text('Utilisateur non connecté'),
+              );
+          }
+
+          return StreamBuilder<List<Group>>(
+            stream: GroupService().getGroupsStream(),
+            builder: (context, snapshot) {
+              if (snapshot.connectionState == ConnectionState.waiting) {
+                return _buildLoadingState();
+              } else if (snapshot.hasError) {
+                print('Erreur du stream: ${snapshot.error}');
+                return Center(
                   child: Column(
                     mainAxisAlignment: MainAxisAlignment.center,
                     children: [
-          Icon(Icons.group, size: 64, color: Colors.blue),
-          SizedBox(height: 16),
-          Text(
-            'Chat de Groupe',
-            style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
-          ),
-          SizedBox(height: 8),
-          Text(
-            'Communiquez avec vos compagnons de voyage',
-            style: TextStyle(fontSize: 16, color: Colors.grey),
+                      const Text('Erreur lors du chargement des groupes.'),
+                      const SizedBox(height: 8),
+                      ElevatedButton(
+                        onPressed: () {
+                          setState(() {
+                            // Forcer le rechargement du stream
+                          });
+                        },
+                        child: const Text('Réessayer'),
                       ),
                     ],
                   ),
                 );
               } 
+
+              final groups = snapshot.data ?? [];
+              print("Groupes reçus: ${groups.length}");
+
+              return RefreshIndicator(
+                onRefresh: () async {
+                  setState() {};
+                },
+                child: SingleChildScrollView(
+                  physics: const AlwaysScrollableScrollPhysics(),
+                  padding: const EdgeInsets.all(16.0),
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Vos Groupes',
+                        style: TextStyle(
+                          fontSize: 24,
+                          fontWeight: FontWeight.bold,
+                          color: Theme.of(context).brightness == Brightness.dark ? Colors.white : Colors.black,
+                        ),
+                      ),
+                      const SizedBox(height: 20),
+                      groups.isEmpty ? _buildEmptyState() : _buildGroupList(groups),
+                    ],
+                  ),
+                ),
+              );
+            },
+          );
+      }),
+    );
+  }
+
+  Widget _buildLoadingState() {
+    return const Center(
+      child: Padding(padding: EdgeInsets.all(16.0),
+        child: CircularProgressIndicator(),
+      ),
+    );
+  }
+
+  Widget _buildEmptyState() {
+    return const Center(
+      child: Text(
+        'Aucun groupe disponible. Créez ou rejoignez un voyage pour commencer à discuter!',
+        style: TextStyle(fontSize: 16, color: Colors.grey),
+        textAlign: TextAlign.center,
+      ),
+    );
+  }
+
+  Widget _buildGroupList(List<Group> groups) {
+    return Column(
+      children: groups.map((group) => _buildGroupCard(group)).toList(),
+    );
+  }
+
+  Widget _buildGroupCard(Group group) {
+    return Card(
+      margin: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
+      child: ListTile(
+        leading: CircleAvatar(
+          child: Text(group.name.isNotEmpty ? group.name[0] : '?'),
+        ),
+        title: Text(group.name),
+        subtitle: Text('${group.members.length} membres'),
+        onTap: () {
+          // Logique pour ouvrir le chat de groupe
+        },
+      ),
+    );
+  }
 }

lib/models/group.dart

@@ -0,0 +1,28 @@
+import 'package:travel_mate/models/user.dart';
+
+class Group {
+  final String? id;
+  final String name;
+  final List<User> members;
+
+  Group({
+    this.id,
+    required this.name,
+    required this.members,
+  });
+
+  factory Group.fromMap(Map<String, dynamic> data, String documentId) {
+    return Group(
+      id: documentId,
+      name: data['name'] ?? '',
+      members: List<User>.from(data['members']?.map((member) => User.fromMap(member)) ?? []),
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'name': name,
+      'members': members.map((member) => member.toMap()).toList(),
+    };
+  }
+}

lib/models/message.dart

@@ -0,0 +1,13 @@
+class Message {
+  final String text; 
+  final DateTime timestamp;
+  final String senderId;
+  final String senderName;
+
+  Message({
+    required this.text,
+    required this.timestamp,
+    required this.senderId,
+    required this.senderName,
+  });
+}

lib/services/group_service.dart

@@ -0,0 +1,26 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:travel_mate/models/group.dart';
+
+class GroupService {
+  final FirebaseFirestore _firestore = FirebaseFirestore.instance;
+
+  Stream<List<Group>> getGroupsStream() {
+    return _firestore.collection('groups').snapshots().map((snapshot) {
+      return snapshot.docs.map((doc) {
+        return Group.fromMap(doc.data(), doc.id);
+      }).toList();
+    });
+  }
+
+  Future<void> createGroup(Group group) async {
+    await _firestore.collection('groups').add(group.toMap());
+  }
+
+  Future<void> updateGroup(Group group) async {
+    await _firestore.collection('groups').doc(group.id).update(group.toMap());
+  }
+
+  Future<void> deleteGroup(String groupId) async {
+    await _firestore.collection('groups').doc(groupId).delete();
+  }
+}