Manter sessão e loading

lib/core/services/auth_service.dart

@@ -1,4 +1,5 @@
 import 'package:firebase_auth/firebase_auth.dart';
+import 'session_service.dart';
 
 /// Service for handling Firebase Authentication
 class AuthService {
@@ -90,12 +91,38 @@ class AuthService {
     try {
       print('DEBUG: Tentando fazer logout');
       await _auth.signOut();
-      print('DEBUG: Logout realizado com sucesso');
+
+      // Clear saved session
+      await SessionService.clearSession();
+
+      print('DEBUG: Logout e limpeza de sessão realizados com sucesso');
     } catch (e) {
       print('DEBUG: Erro ao fazer logout: $e');
     }
   }
 
+  /// Attempt auto-login with saved credentials
+  static Future<bool> attemptAutoLogin() async {
+    try {
+      final sessionData = await SessionService.shouldAutoLogin();
+
+      if (sessionData['shouldAutoLogin'] == true) {
+        final email = sessionData['email'];
+        print('DEBUG: Attempting auto-login for: $email');
+
+        // Note: For security reasons, we cannot auto-login without password
+        // This method just checks if auto-login is available
+        // The actual login still requires user to enter password
+        return true;
+      }
+
+      return false;
+    } catch (e) {
+      print('DEBUG: Error in auto-login attempt: $e');
+      return false;
+    }
+  }
+
   /// Get user-friendly error message
   static String _getErrorMessage(String code) {
     print('DEBUG: Processando código de erro: $code');

lib/core/services/session_service.dart

@@ -0,0 +1,130 @@
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+
+/// Service for managing persistent user sessions
+class SessionService {
+  static const String _rememberMeKey = 'remember_me';
+  static const String _userEmailKey = 'user_email';
+  static const String _userDisplayNameKey = 'user_display_name';
+  static const String _lastLoginTimeKey = 'last_login_time';
+
+  /// Save session preferences when user chooses "Remember me"
+  static Future<void> saveSession({
+    required bool rememberMe,
+    required String email,
+    String? displayName,
+  }) async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      
+      // Save remember me preference
+      await prefs.setBool(_rememberMeKey, rememberMe);
+      
+      if (rememberMe) {
+        // Save user details for auto-login
+        await prefs.setString(_userEmailKey, email);
+        if (displayName != null) {
+          await prefs.setString(_userDisplayNameKey, displayName);
+        }
+        await prefs.setInt(_lastLoginTimeKey, DateTime.now().millisecondsSinceEpoch);
+      } else {
+        // Clear saved session if remember me is unchecked
+        await clearSession();
+      }
+      
+      print('DEBUG: Session saved - Remember me: $rememberMe, Email: $email');
+    } catch (e) {
+      print('DEBUG: Error saving session: $e');
+    }
+  }
+
+  /// Check if user should be automatically logged in
+  static Future<Map<String, dynamic>> shouldAutoLogin() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      
+      final rememberMe = prefs.getBool(_rememberMeKey) ?? false;
+      final email = prefs.getString(_userEmailKey);
+      final displayName = prefs.getString(_userDisplayNameKey);
+      final lastLoginTime = prefs.getInt(_lastLoginTimeKey);
+      
+      print('DEBUG: Auto-login check - Remember me: $rememberMe, Email: $email');
+      
+      if (rememberMe && email != null) {
+        // Check if session is not too old (optional: 30 days)
+        if (lastLoginTime != null) {
+          final lastLogin = DateTime.fromMillisecondsSinceEpoch(lastLoginTime);
+          final now = DateTime.now();
+          final daysSinceLogin = now.difference(lastLogin).inDays;
+          
+          if (daysSinceLogin <= 30) {
+            return {
+              'shouldAutoLogin': true,
+              'email': email,
+              'displayName': displayName,
+            };
+          } else {
+            print('DEBUG: Session too old, clearing session');
+            await clearSession();
+          }
+        }
+      }
+      
+      return {'shouldAutoLogin': false};
+    } catch (e) {
+      print('DEBUG: Error checking auto-login: $e');
+      return {'shouldAutoLogin': false};
+    }
+  }
+
+  /// Clear saved session data
+  static Future<void> clearSession() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.remove(_rememberMeKey);
+      await prefs.remove(_userEmailKey);
+      await prefs.remove(_userDisplayNameKey);
+      await prefs.remove(_lastLoginTimeKey);
+      
+      print('DEBUG: Session cleared');
+    } catch (e) {
+      print('DEBUG: Error clearing session: $e');
+    }
+  }
+
+  /// Get current session info
+  static Future<Map<String, dynamic>> getCurrentSession() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      
+      return {
+        'rememberMe': prefs.getBool(_rememberMeKey) ?? false,
+        'email': prefs.getString(_userEmailKey),
+        'displayName': prefs.getString(_userDisplayNameKey),
+        'lastLoginTime': prefs.getInt(_lastLoginTimeKey),
+      };
+    } catch (e) {
+      print('DEBUG: Error getting current session: $e');
+      return {};
+    }
+  }
+
+  /// Update session with current Firebase user
+  static Future<void> updateSessionWithCurrentUser() async {
+    try {
+      final user = FirebaseAuth.instance.currentUser;
+      if (user != null) {
+        final currentSession = await getCurrentSession();
+        if (currentSession['rememberMe'] == true) {
+          await saveSession(
+            rememberMe: true,
+            email: user.email ?? '',
+            displayName: user.displayName,
+          );
+        }
+      }
+    } catch (e) {
+      print('DEBUG: Error updating session with current user: $e');
+    }
+  }
+}