Début refacto en MVVM (Login, drawer OK

em2rp/lib/providers/local_auth_provider.dart

@@ -0,0 +1,46 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import '../models/user_model.dart';
+
+class LocalAuthProvider with ChangeNotifier {
+  UserModel? _currentUser;
+
+  UserModel? get currentUser => _currentUser;
+  String? get role => _currentUser?.role;
+
+  void setUser(UserModel user) {
+    _currentUser = user;
+    notifyListeners();
+  }
+
+  void clearUser() {
+    _currentUser = null;
+    notifyListeners();
+  }
+
+  Future<UserCredential> signInWithEmailAndPassword(
+      String email, String password) async {
+    try {
+      UserCredential userCredential = await FirebaseAuth.instance
+          .signInWithEmailAndPassword(email: email, password: password);
+
+      DocumentSnapshot userDoc = await FirebaseFirestore.instance
+          .collection('users')
+          .doc(userCredential.user!.uid)
+          .get();
+
+      if (userDoc.exists) {
+        setUser(UserModel.fromMap(
+            userDoc.data() as Map<String, dynamic>, userDoc.id));
+      } else {
+        throw FirebaseAuthException(
+            code: 'user-not-found',
+            message: "Aucune donnée utilisateur trouvée.");
+      }
+      return userCredential;
+    } on FirebaseAuthException catch (e) {
+      throw FirebaseAuthException(code: e.code, message: e.message);
+    }
+  }
+}