feat: persist splitMode/splitPercentage and list defaultSplitPercentage

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/java/de/zendric/app/xpensely_server/model/Expense.java

@@ -6,6 +6,8 @@ import java.time.LocalDateTime;
 import com.fasterxml.jackson.annotation.JsonBackReference;
 
 import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
@@ -36,6 +38,12 @@ public class Expense {
     private Double personalUseAmount;
     private Double otherPersonAmount;
     private String category;
+
+    @Enumerated(EnumType.STRING)
+    private SplitMode splitMode;
+
+    private Integer splitPercentage;
+
     private LocalDate date;
     private LocalDateTime lastModified;
 

src/main/java/de/zendric/app/xpensely_server/model/ExpenseChangeRequest.java

@@ -33,6 +33,9 @@ public class ExpenseChangeRequest {
     private Double personalUseAmount;
     private Double otherPersonAmount;
 
+    private SplitMode splitMode;
+    private Integer splitPercentage;
+
     @NotNull(message = "Date is required")
     private LocalDate date;
 
@@ -55,6 +58,8 @@ public class ExpenseChangeRequest {
         // The edit dialog sends "" for a missing category; store null so the
         // stub state stays uniform and history diffs don't report null -> "".
         expense.setCategory(category == null || category.isBlank() ? null : category);
+        expense.setSplitMode(splitMode == null ? SplitMode.DETAILED : splitMode);
+        expense.setSplitPercentage(splitPercentage);
 
         return expense;
     }

src/main/java/de/zendric/app/xpensely_server/model/ExpenseInput.java

@@ -33,6 +33,9 @@ public class ExpenseInput {
     private Double personalUseAmount;
     private Double otherPersonAmount;
 
+    private SplitMode splitMode;
+    private Integer splitPercentage;
+
     @NotNull(message = "Date is required")
     private LocalDate date;
 
@@ -56,6 +59,8 @@ public class ExpenseInput {
         expense.setOwner(appUser);
         expense.setTitle(title);
         expense.setCategory(category);
+        expense.setSplitMode(splitMode == null ? SplitMode.DETAILED : splitMode);
+        expense.setSplitPercentage(splitPercentage);
 
         return expense;
     }

src/main/java/de/zendric/app/xpensely_server/model/ExpenseList.java

@@ -31,6 +31,8 @@ public class ExpenseList {
 
     private String name;
 
+    private Integer defaultSplitPercentage = 50;
+
     private String inviteCode;
     @JsonIgnore
     private LocalDateTime inviteCodeExpiration;

src/main/java/de/zendric/app/xpensely_server/model/SplitMode.java

@@ -0,0 +1,6 @@
+package de.zendric.app.xpensely_server.model;
+
+public enum SplitMode {
+    DETAILED,
+    PERCENTAGE
+}

src/main/java/de/zendric/app/xpensely_server/services/ExpenseListService.java

@@ -137,6 +137,8 @@ public class ExpenseListService {
         existingExpense.setDate(updatedExpense.getDate());
         existingExpense.setOwner(updatedExpense.getOwner());
         existingExpense.setCategory(updatedExpense.getCategory());
+        existingExpense.setSplitMode(updatedExpense.getSplitMode());
+        existingExpense.setSplitPercentage(updatedExpense.getSplitPercentage());
         existingExpense.setLastModified(LocalDateTime.now());
 
         Expense saved = expenseRepository.save(existingExpense);
@@ -153,6 +155,8 @@ public class ExpenseListService {
         copy.setPersonalUseAmount(e.getPersonalUseAmount());
         copy.setOtherPersonAmount(e.getOtherPersonAmount());
         copy.setCategory(e.getCategory());
+        copy.setSplitMode(e.getSplitMode());
+        copy.setSplitPercentage(e.getSplitPercentage());
         copy.setDate(e.getDate());
         copy.setOwner(e.getOwner());
         return copy;

src/test/java/de/zendric/app/xpensely_Server/services/ExpenseListServiceTest.java

@@ -3,6 +3,7 @@ package de.zendric.app.xpensely_Server.services;
 import de.zendric.app.xpensely_server.model.AppUser;
 import de.zendric.app.xpensely_server.model.Expense;
 import de.zendric.app.xpensely_server.model.ExpenseList;
+import de.zendric.app.xpensely_server.model.SplitMode;
 import de.zendric.app.xpensely_server.repo.ExpenseListRepository;
 import de.zendric.app.xpensely_server.repo.ExpenseRepository;
 import de.zendric.app.xpensely_server.repo.XpenselyCustomCategoryRepository;
@@ -109,6 +110,29 @@ class ExpenseListServiceTest {
         assertThat(beforeCaptor.getValue().getAmount()).isEqualTo(12.0);
     }
 
+    @Test
+    void updateExpense_persistsSplitModeAndPercentage() {
+        AppUser actor = new AppUser(); actor.setId(1L);
+        ExpenseList list = new ExpenseList(); list.setId(10L); list.setOwner(actor);
+        Expense existing = makeExpense(5L, "Groceries", 100.0);
+        list.setExpenses(new ArrayList<>(List.of(existing)));
+
+        Expense incoming = makeExpense(5L, "Groceries", 100.0);
+        incoming.setDate(LocalDate.now());
+        incoming.setOwner(list.getOwner());
+        incoming.setSplitMode(SplitMode.PERCENTAGE);
+        incoming.setSplitPercentage(70);
+
+        when(repository.findById(10L)).thenReturn(Optional.of(list));
+        when(expenseRepository.findById(5L)).thenReturn(Optional.of(existing));
+        when(expenseRepository.save(any(Expense.class))).thenAnswer(inv -> inv.getArgument(0));
+
+        Expense saved = service.updateExpense(10L, incoming, actor);
+
+        assertThat(saved.getSplitMode()).isEqualTo(SplitMode.PERCENTAGE);
+        assertThat(saved.getSplitPercentage()).isEqualTo(70);
+    }
+
     @Test
     void deleteById_deletesHistoryEntriesBeforeDeletingList() {
         service.deleteById(10L);