feat: debt by user calculations

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

@@ -6,6 +6,7 @@ import jakarta.validation.constraints.Size;
 import lombok.Getter;
 import lombok.Setter;
 
+import java.math.BigDecimal;
 import java.util.Set;
 
 @Entity
@@ -32,6 +33,12 @@ public class Person {
     @Column(name = "email")
     private String email;
 
+    @Column(name = "debt")
+    private BigDecimal debt;
+
+    @Column(name = "credit")
+    private BigDecimal credit;
+
 //    @JsonIgnore
     @ManyToMany(mappedBy = "creditors")
     private Set<Expense> creditorExpenses;

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

@@ -2,12 +2,20 @@ package com.application.munera.repositories;
 
 
 import com.application.munera.data.Expense;
+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 org.springframework.data.repository.query.Param;
 
-public interface ExpenseRepository
-        extends
-            JpaRepository<Expense, Long>,
-            JpaSpecificationExecutor<Expense> {
+import java.util.Collection;
+import java.util.Set;
 
-}
+public interface ExpenseRepository extends JpaRepository<Expense, Long>, JpaSpecificationExecutor<Expense> {
+
+    @Query("SELECT e FROM Expense e JOIN e.creditors c WHERE c.id = :personId")
+    Set<Expense> findCreditorsExpensesByPersonId(@Param("personId") Long personId);
+
+    @Query("SELECT e FROM Expense e JOIN e.debtors d WHERE d.id = :personId")
+    Set<Expense> findDebtorsExpensesByPersonId(@Param("personId") Long personId);
+}

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

@@ -1,12 +1,14 @@
 package com.application.munera.services;
 
 import com.application.munera.data.Expense;
+import com.application.munera.data.Person;
 import com.application.munera.repositories.ExpenseRepository;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.stereotype.Service;
 
+import java.util.Collection;
 import java.util.List;
 import java.util.Optional;
 
@@ -23,6 +25,10 @@ public class ExpenseService {
         return repository.findById(id);
     }
 
+    public Collection<Expense> findDebtByUser(final Person person) {
+        return repository.findDebtorsExpensesByPersonId(person.getId());
+    }
+
     public List<Expense> findAll() {return repository.findAll();}
 
     public Expense update(Expense entity) {

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

@@ -1,5 +1,6 @@
 package com.application.munera.services;
 
+import com.application.munera.data.Expense;
 import com.application.munera.data.Person;
 import com.application.munera.repositories.PersonRepository;
 import org.springframework.data.domain.Page;
@@ -7,6 +8,7 @@ import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.stereotype.Service;
 
+import java.math.BigDecimal;
 import java.util.List;
 import java.util.Optional;
 
@@ -14,9 +16,11 @@ import java.util.Optional;
 public class PersonService {
 
     private final PersonRepository personRepository;
+    private final ExpenseService expenseService;
 
-    public PersonService(PersonRepository personRepository) {
+    public PersonService(PersonRepository personRepository, ExpenseService expenseService) {
         this.personRepository = personRepository;
+        this.expenseService = expenseService;
     }
 
     public Optional<Person> get(Long id) {
@@ -46,4 +50,8 @@ public class PersonService {
     public int count() {
         return (int) this.personRepository.count();
     }
+
+    public BigDecimal calculateDebt(final Person person){
+        return this.expenseService.findDebtByUser(person).stream().map(Expense::getCost).reduce(BigDecimal.ZERO, BigDecimal::add);
+    }
 }

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

@@ -69,8 +69,8 @@ public class PeopleView extends Div implements BeforeEnterObserver {
         grid.addColumn(Person::getFirstName).setHeader("First Name").setSortable(true);
         grid.addColumn(Person::getLastName).setHeader("Last Name").setSortable(true);
         grid.addColumn(Person::getEmail).setHeader("Email").setSortable(true);
+        grid.addColumn(personService::calculateDebt).setHeader("Debt").setSortable(true);
         grid.getColumns().forEach(col -> col.setAutoWidth(true));
-
         grid.setItems(query -> personService.list(
                         PageRequest.of(query.getPage(), query.getPageSize(), VaadinSpringDataHelpers.toSpringDataSort(query)))
                 .stream());