a

src/main/java/com/sasiedzi/event/domain/UserAccount.java

@@ -1,8 +1,11 @@
 package com.sasiedzi.event.domain;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 import jakarta.persistence.*;
 import java.io.Serializable;
+import java.math.BigDecimal;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -43,6 +46,15 @@ public class UserAccount implements Serializable {
         return this.id;
     }
 
+    @Transient
+    //    @JsonSerialize
+    BigDecimal balance = BigDecimal.ZERO;
+
+    @JsonProperty("balance")
+    public BigDecimal getBalance() {
+        return balance;
+    }
+
     public UserAccount id(Long id) {
         this.setId(id);
         return this;
@@ -88,6 +100,10 @@ public class UserAccount implements Serializable {
         return this;
     }
 
+    public void setBalance(BigDecimal balance) {
+        this.balance = balance;
+    }
+
     public Set<TransactionItem> getTransactionItems() {
         return this.transactionItems;
     }

src/main/java/com/sasiedzi/event/repository/TransactionItemRepository.java

@@ -39,4 +39,7 @@ public interface TransactionItemRepository extends JpaRepository<TransactionItem
         "select transactionItem from TransactionItem transactionItem left join fetch transactionItem.event where transactionItem.id =:id"
     )
     Optional<TransactionItem> findOneWithToOneRelationships(@Param("id") Long id);
+
+    @Query("select transactionItem from TransactionItem transactionItem where transactionItem.userAccount.id =:accountId")
+    List<TransactionItem> getTransactionItemsForAccountId(@Param("accountId") Long accountId);
 }

src/main/java/com/sasiedzi/event/repository/UserAccountRepository.java

@@ -1,5 +1,6 @@
 package com.sasiedzi.event.repository;
 
+import com.sasiedzi.event.domain.Charge;
 import com.sasiedzi.event.domain.UserAccount;
 import java.util.List;
 import java.util.Optional;
@@ -27,4 +28,8 @@ public interface UserAccountRepository extends UserAccountRepositoryWithBagRelat
     default Page<UserAccount> findAllWithEagerRelationships(Pageable pageable) {
         return this.fetchBagRelationships(this.findAll(pageable));
     }
+
+    @Query("select userAccount from UserAccount userAccount join fetch userAccount.users")
+    //    List<UserAccount> findByUserLogin(String login);
+    List<UserAccount> findAllFetchAccounts();
 }

src/main/java/com/sasiedzi/event/service/EventService.java

@@ -2,10 +2,8 @@ package com.sasiedzi.event.service;
 
 import com.sasiedzi.event.domain.*;
 import com.sasiedzi.event.domain.enumeration.TransactionType;
-import com.sasiedzi.event.repository.EventRepository;
-import com.sasiedzi.event.repository.TransactionRepository;
-import com.sasiedzi.event.repository.UserAccountRepository;
-import com.sasiedzi.event.web.rest.TransactionResource;
+import com.sasiedzi.event.repository.*;
+import com.sasiedzi.event.web.rest.AccountResource;
 import jakarta.validation.Valid;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
@@ -16,6 +14,8 @@ import java.util.stream.Collectors;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.core.AuthenticatedPrincipal;
+import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -30,6 +30,15 @@ public class EventService {
 
     private final EventRepository eventRepository;
 
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private AccountResource accountResource;
+
     public EventService(EventRepository eventRepository) {
         this.eventRepository = eventRepository;
     }
@@ -186,10 +195,7 @@ public class EventService {
                     String login = registration.getUser().getLogin();
                     UserAccount userAccount = accountsByLogin.get(login);
                     if (userAccount == null) {
-                        userAccount = new UserAccount();
-                        userAccount.setName(registration.getUser().getName());
-                        userAccount.getUsers().add(registration.getUser());
-                        userAccount = userAccountRepository.save(userAccount);
+                        userAccount = createNewAccountForLogin(login);
                         accountsByLogin.put(login, userAccount);
                     }
                     accountsToCharge.add(userAccount);
@@ -227,4 +233,72 @@ public class EventService {
 
         return eventRepository.findById(event.getId());
     }
+
+    public String getCurrentAuthenticatedUserAsDTO() {
+        if (SecurityContextHolder.getContext().getAuthentication() == null) {
+            return null;
+        }
+        if (SecurityContextHolder.getContext() == null) {
+            return null;
+        }
+        Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
+        if (principal instanceof AuthenticatedPrincipal) {
+            return ((AuthenticatedPrincipal) principal).getName();
+            //            return userService.getUserFromAuthentication((AbstractAuthenticationToken) principal);
+        } else {
+            throw new RuntimeException("User could not be found");
+        }
+    }
+
+    public UserAccount createNewAccountForLogin(String login) {
+        UserAccount entity = new UserAccount();
+        Optional<User> oneByLogin = userRepository.findOneByLogin(login);
+        if (oneByLogin.isPresent()) {
+            entity.setName(oneByLogin.get().getName());
+            entity.getUsers().add(oneByLogin.get());
+            entity = userAccountRepository.save(entity);
+            return entity;
+        } else {
+            throw new RuntimeException("user not found");
+        }
+    }
+
+    public UserAccount getOrCreateForCurrentUser() {
+        //        if (true) return new UserAccount();
+        String username = getCurrentAuthenticatedUserAsDTO();
+        if (username != null) {
+            //            List<UserAccount> userAccounts = userAccountRepository.findByUserLogin(currentAuthenticatedUserAsDTO.getLogin());
+            List<UserAccount> userAccounts = userAccountRepository
+                .findAllFetchAccounts()
+                .stream()
+                .filter(accountResource -> {
+                    return accountResource.getUsers().stream().anyMatch(user -> user.getLogin().equals(username));
+                })
+                .toList();
+            if (userAccounts.isEmpty()) {
+                return createNewAccountForLogin(username);
+            } else {
+                UserAccount userAccount = userAccounts.get(0);
+                List<TransactionItem> transactionItemsForAccountId = transactionItemRepository.getTransactionItemsForAccountId(
+                    userAccount.getId()
+                );
+
+                BigDecimal totalBalance = transactionItemsForAccountId
+                    .stream()
+                    .map(TransactionItem::getAmount)
+                    .reduce(BigDecimal.ZERO, BigDecimal::add);
+
+                userAccount.setBalance(totalBalance);
+
+                return userAccount;
+            }
+        } else {
+            UserAccount userAccount = new UserAccount();
+            userAccount.setName("Unauthenticated User");
+            return userAccount;
+        }
+    }
+
+    @Autowired
+    TransactionItemRepository transactionItemRepository;
 }

src/main/java/com/sasiedzi/event/service/dto/UserDTO.java

@@ -1,6 +1,7 @@
 package com.sasiedzi.event.service.dto;
 
 import com.sasiedzi.event.domain.User;
+import jakarta.persistence.Transient;
 import java.io.Serializable;
 import java.util.Objects;
 

src/main/java/com/sasiedzi/event/web/rest/UserAccountResource.java

@@ -1,7 +1,10 @@
 package com.sasiedzi.event.web.rest;
 
+import com.sasiedzi.event.domain.User;
 import com.sasiedzi.event.domain.UserAccount;
 import com.sasiedzi.event.repository.UserAccountRepository;
+import com.sasiedzi.event.service.EventService;
+import com.sasiedzi.event.service.UserService;
 import com.sasiedzi.event.web.rest.errors.BadRequestAlertException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -10,8 +13,11 @@ import java.util.Objects;
 import java.util.Optional;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.bind.annotation.*;
 import tech.jhipster.web.util.HeaderUtil;
@@ -166,6 +172,12 @@ public class UserAccountResource {
         return ResponseUtil.wrapOrNotFound(userAccount);
     }
 
+    @GetMapping("/currentUser")
+    public UserAccount getCurrentUserAccount() {
+        UserAccount userAccount = eventService.getOrCreateForCurrentUser();
+        return userAccount;
+    }
+
     /**
      * {@code DELETE  /user-accounts/:id} : delete the "id" userAccount.
      *
@@ -180,4 +192,7 @@ public class UserAccountResource {
             .headers(HeaderUtil.createEntityDeletionAlert(applicationName, false, ENTITY_NAME, id.toString()))
             .build();
     }
+
+    @Autowired
+    EventService eventService;
 }