fix: major changes

src/main/java/com/application/munera/StartupInitializer.java

@@ -0,0 +1,41 @@
+package com.application.munera;
+
+import com.application.munera.data.Person;
+import com.application.munera.repositories.PersonRepository;
+import com.application.munera.repositories.UserRepository;
+import jakarta.annotation.PostConstruct;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+
+@Component
+public class StartupInitializer {
+
+    private final UserRepository userRepository;
+    private final PersonRepository personRepository;
+
+    @Autowired
+    public StartupInitializer(UserRepository userRepository, PersonRepository personRepository) {
+        this.userRepository = userRepository;
+        this.personRepository = personRepository;
+    }
+
+    /**
+     * Initializes Person entities for all existing users.
+     */
+    @PostConstruct
+    public void initializePersonEntities() {
+        userRepository.findAll().forEach(user -> {
+            // Check if Person entity exists for the user by userId
+            if (personRepository.findByUserId(user.getId()).isEmpty()) {
+                // Create and save the Person entity
+                Person newPerson = new Person();
+                newPerson.setFirstName(user.getFirstName());
+                newPerson.setLastName(user.getLastName());
+                newPerson.setUsername(user.getUsername());
+                newPerson.setUserId(user.getId());
+                personRepository.save(newPerson);
+            }
+        });
+    }
+}

src/main/java/com/application/munera/data/Person.java

@@ -50,6 +50,12 @@ public class Person extends AbstractEntity {
     @ManyToMany(mappedBy = "participants")
     private Set<Event> events;
 
+    @Column(name = "Username", unique = true, nullable = false)
+    private String username; // This field will link to the User entity
+
+    @Column(name = "UserId", unique = true)
+    private Long userId; // Reference to the User entity
+
     @Override
     public boolean equals(Object obj) {
         if (obj == this) {

src/main/java/com/application/munera/data/User.java

@@ -24,7 +24,7 @@ public class User {
     private String lastName;
 
     @Size(max = 100)
-    @Column(name = "username", nullable = false)
+    @Column(name = "username",unique = true, nullable = false)
     private String username;
 
     @Size(max = 100)

src/main/java/com/application/munera/repositories/PersonRepository.java

@@ -3,6 +3,14 @@ package com.application.munera.repositories;
 import com.application.munera.data.Person;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
+import java.util.Optional;
 
 public interface PersonRepository extends JpaRepository<Person, Long>, JpaSpecificationExecutor<Person> {
+    Optional<Person> findByUserId(Long userId);
+
+    @Query("SELECT p FROM Person p WHERE p.userId IS NULL")
+    List<Person> findAllExcludeUser();
 }

src/main/java/com/application/munera/services/PersonService.java

@@ -40,6 +40,15 @@ public class PersonService {
         return this.personRepository.findAll();
     }
 
+
+    /**
+     * Finds all people excluding the users'ones.
+     * @return a collection of all persons
+     */
+    public List<Person> findAllExcludeUsers() {
+        return this.personRepository.findAllExcludeUser();
+    }
+
     /**
      * Lists all persons with pagination.
      * @param pageable the pagination information

src/main/java/com/application/munera/views/dashboard/DashboardView.java

@@ -189,7 +189,7 @@ public class DashboardView extends Div {
     }
 
     private String generateNegativeColumnChartScript() {
-        final var people = personService.findAll().stream()
+        final var people = personService.findAllExcludeUsers().stream()
                 .filter(person -> personService.calculateNetBalance(person).compareTo(BigDecimal.ZERO) != 0)
                 .toList();
         if (people.isEmpty()) return generatePlaceholderChartScript("bottomLeftChart", "No Data Available");

src/main/java/com/application/munera/views/expenses/ExpensesView.java

@@ -152,22 +152,7 @@ public class ExpensesView extends Div implements BeforeEnterObserver {
             }
         });
 
-        //TODO: THIS NEEDS TO BE IMPLEMENTED BUT FOR THE SINGLE PERSON NOW, STILL NEEDED
-//        // Event listeners that will remove the selected creditors from the debtors list and vice versa
-//        // Done so that the user cant create an expense with the same person as creditor and debtor
-//        payer.addValueChangeListener(event -> {
-//            Person selectedDebtors = event.getValue();
-//            final var creditorsSet = new HashSet<>(personService.findAll());
-//            creditorsSet.removeIf(creditorsSet.contains(selectedDebtors));
-//            payer.setItems(creditorsSet);
-//        });
-//
-//        creditors.addValueChangeListener(event -> {
-//            Set<Person> selectedCreditors = event.getValue();
-//            final var debtorsSet = new HashSet<>(personService.findAll());
-//            debtorsSet.removeIf(selectedCreditors::contains);
-//            debtors.setItems(debtorsSet);
-//        });
+
 
         cancel.addClickListener(e -> {
             clearForm();

src/main/java/com/application/munera/views/people/PeopleView.java

@@ -93,7 +93,7 @@ public class PeopleView extends Div implements BeforeEnterObserver {
             }
         })).setHeader("Actions");
 
-        List<Person> people =  personService.findAll();
+        List<Person> people =  personService.findAllExcludeUsers();
 
         this.setGridData(people);