Fix expense/income creation

src/main/java/com/faf223/expensetrackerfaf/service/ExpenseCategoryService.java

@@ -0,0 +1,18 @@
+package com.faf223.expensetrackerfaf.service;
+
+import com.faf223.expensetrackerfaf.model.ExpenseCategory;
+import com.faf223.expensetrackerfaf.repository.ExpenseCategoryRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class ExpenseCategoryService {
+
+    private final ExpenseCategoryRepository expenseCategoryRepository;
+
+    public ExpenseCategory getExpenseCategory(long category) {
+        return expenseCategoryRepository.getReferenceById(category);
+    }
+
+}

src/main/java/com/faf223/expensetrackerfaf/service/IncomeCategoryService.java

@@ -0,0 +1,17 @@
+package com.faf223.expensetrackerfaf.service;
+
+import com.faf223.expensetrackerfaf.model.IncomeCategory;
+import com.faf223.expensetrackerfaf.repository.IncomeCategoryRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class IncomeCategoryService {
+
+    private final IncomeCategoryRepository incomeCategoryRepository;
+
+    public IncomeCategory getExpenseCategory(long category) {
+        return incomeCategoryRepository.getReferenceById(category);
+    }
+}

src/main/java/com/faf223/expensetrackerfaf/service/UserService.java

@@ -1,17 +1,21 @@
 package com.faf223.expensetrackerfaf.service;
 
+import com.faf223.expensetrackerfaf.model.Credential;
 import com.faf223.expensetrackerfaf.model.User;
+import com.faf223.expensetrackerfaf.repository.CredentialRepository;
 import com.faf223.expensetrackerfaf.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Optional;
 
 @Service
 @RequiredArgsConstructor
 public class UserService {
 
     private final UserRepository userRepository;
+    private final CredentialRepository credentialRepository;
 
     public void updateUser(User user) {
         userRepository.save(user);
@@ -24,4 +28,12 @@ public class UserService {
     public User getUserById(String userUuid) {
         return userRepository.findById(userUuid).orElse(null);
     }
+    public User getUserByEmail(String email) {
+        Optional<Credential> credential = credentialRepository.findByEmail(email);
+        if (credential.isPresent()) {
+            Optional<User> user = userRepository.findById(credential.get().getUser().getUserUuid());
+            return user.orElse(null);
+        }
+        return null;
+    }
 }