Update authentication to use REST API

src/main/java/org/example/petshopdesktop/auth/UserSession.java

@@ -3,11 +3,13 @@ package org.example.petshopdesktop.auth;
 public class UserSession {
     private static UserSession instance;
 
-    private Integer userId;
+    private Long userId;
-    private Integer employeeId;
+    private Long employeeId;
     private String username;
     private String employeeName;
     private Role role;
+    private String jwtToken;
+    private Long storeId;
 
     private UserSession() {}
 
@@ -18,12 +20,13 @@ public class UserSession {
         return instance;
     }
 
-    public void login(int userId, int employeeId, String username, String employeeName, Role role) {
+    public void login(Long userId, String username, Role role, String jwtToken) {
         this.userId = userId;
-        this.employeeId = employeeId;
+        this.employeeId = userId;
         this.username = username;
-        this.employeeName = employeeName;
+        this.employeeName = username;
         this.role = role;
+        this.jwtToken = jwtToken;
     }
 
     public void logout() {
@@ -32,13 +35,15 @@ public class UserSession {
         this.username = null;
         this.employeeName = null;
         this.role = null;
+        this.jwtToken = null;
+        this.storeId = null;
     }
 
-    public Integer getUserId() {
+    public Long getUserId() {
         return userId;
     }
 
-    public Integer getEmployeeId() {
+    public Long getEmployeeId() {
         return employeeId;
     }
 
@@ -54,6 +59,18 @@ public class UserSession {
         return role;
     }
 
+    public String getJwtToken() {
+        return jwtToken;
+    }
+
+    public Long getStoreId() {
+        return storeId;
+    }
+
+    public void setStoreId(Long storeId) {
+        this.storeId = storeId;
+    }
+
     public boolean isLoggedIn() {
         return username != null && role != null;
     }

src/main/java/org/example/petshopdesktop/controllers/LoginController.java

@@ -10,13 +10,17 @@ import javafx.scene.control.PasswordField;
 import javafx.scene.control.TextField;
 import javafx.stage.Modality;
 import javafx.stage.Stage;
+import org.example.petshopdesktop.api.ApiClient;
+import org.example.petshopdesktop.api.dto.auth.LoginRequest;
+import org.example.petshopdesktop.api.dto.auth.LoginResponse;
+import org.example.petshopdesktop.api.dto.auth.UserInfoResponse;
+import org.example.petshopdesktop.api.dto.common.DropdownOption;
+import org.example.petshopdesktop.api.endpoints.DropdownApi;
+import org.example.petshopdesktop.auth.Role;
 import org.example.petshopdesktop.auth.UserSession;
-import org.example.petshopdesktop.database.ConnectionDB;
-import org.example.petshopdesktop.database.UserDB;
-import org.example.petshopdesktop.models.User;
 import org.example.petshopdesktop.util.ActivityLogger;
 
-import java.sql.SQLException;
+import java.util.List;
 
 public class LoginController {
 
@@ -32,15 +36,6 @@ public class LoginController {
     @FXML
     public void initialize() {
         lblError.setText("");
-        try {
-            ConnectionDB.getConnection().close();
-            try {
-                UserDB.initializeTable();
-            } catch (Exception ignored) {
-            }
-        } catch (Exception e) {
-            lblError.setText("Database is not connected. Check Docker and connectionpetstore.properties.");
-        }
     }
 
     @FXML
@@ -54,39 +49,43 @@ public class LoginController {
         }
 
         try {
-            User user = UserDB.authenticate(username, password);
+            ApiClient apiClient = ApiClient.getInstance();
-            if (user == null) {
+
-                lblError.setText("Invalid username or password.");
+            LoginRequest loginRequest = new LoginRequest(username, password);
-                txtPassword.clear();
+            LoginResponse loginResponse = apiClient.post("/api/v1/auth/login", loginRequest, LoginResponse.class);
-                return;
+
+            String token = loginResponse.getToken();
+            String roleStr = loginResponse.getRole();
+            Role role = Role.valueOf(roleStr.toUpperCase());
+
+            UserSession.getInstance().login(null, username, role, token);
+
+            UserInfoResponse userInfo = apiClient.get("/api/v1/auth/me", UserInfoResponse.class);
+            UserSession.getInstance().login(userInfo.getId(), username, role, token);
+
+            List<DropdownOption> stores = DropdownApi.getInstance().getStores();
+            if (!stores.isEmpty()) {
+                UserSession.getInstance().setStoreId(stores.get(0).getId());
             }
 
-            UserSession.getInstance().login(
-                user.getUserId(),
-                user.getEmployeeId(),
-                user.getUsername(),
-                user.getEmployeeFullName(),
-                user.getRole()
-            );
             openMainLayout();
 
-        } catch (SQLException e) {
+        } catch (Exception e) {
             ActivityLogger.getInstance().logException(
                 "LoginController.btnLoginClicked",
                 e,
                 "Authentication attempt for username: " + username);
-            String msg = e.getMessage() == null ? "" : e.getMessage().toLowerCase();
+
-            if (msg.contains("doesn't exist") || msg.contains("unknown database") || msg.contains("access denied")) {
+            String errorMsg = e.getMessage();
-                lblError.setText("Database error. Check Docker and connectionpetstore.properties.");
+            if (errorMsg != null && errorMsg.contains("Authentication failed")) {
+                lblError.setText("Invalid username or password.");
+                txtPassword.clear();
+            } else if (e.getCause() instanceof java.net.ConnectException ||
+                       e instanceof java.net.http.HttpConnectTimeoutException) {
+                lblError.setText("Backend is not reachable, check backend docker compose and port 8080.");
             } else {
-                lblError.setText("Login failed. Check username and password.");
+                lblError.setText(errorMsg != null ? errorMsg : "Login failed. Please try again.");
             }
-        } catch (RuntimeException e) {
-            ActivityLogger.getInstance().logException(
-                "LoginController.btnLoginClicked",
-                e,
-                "Database connection");
-            lblError.setText("Database is not connected. Check Docker and connectionpetstore.properties.");
         }
     }