feat(expenses): add edit amount and due date for pending expenses

apps/backend/src/modules/expenses/expenses.service.ts

@@ -23,6 +23,11 @@ export const payExpenseSchema = z.object({
   paymentDate: z.string().datetime().optional(),
 });
 
+export const updateExpenseSchema = z.object({
+  amount: z.number().positive("El monto debe ser mayor a 0"),
+  dueDate: z.string().datetime({ message: "La fecha debe ser una fecha ISO válida" }),
+});
+
 function lastDayOfMonth(year: number, month: number): number {
   return new Date(year, month, 0).getDate();
 }
@@ -187,6 +192,32 @@ export async function payExpense(
   return result;
 }
 
+export async function updateExpense(
+  id: number,
+  data: z.infer<typeof updateExpenseSchema>,
+) {
+  const existing = await prisma.expense.findUniqueOrThrow({ where: { id } });
+  if (existing.status !== PaymentStatus.PENDING) {
+    throw new Error("Solo se pueden editar gastos pendientes");
+  }
+
+  const dueDate = new Date(data.dueDate);
+  const year = dueDate.getUTCFullYear();
+  const month = dueDate.getUTCMonth() + 1;
+
+  const result = await prisma.expense.update({
+    where: { id },
+    data: {
+      amount: data.amount,
+      dueDate,
+      year,
+      month,
+    },
+  });
+  cache.invalidateByPrefix("expenses:");
+  return result;
+}
+
 export async function getMonthlyPayedTotal(year: number, month: number) {
   const cacheKey = `expenses:monthly-total:${year}:${month}`;
   const cached = cache.get(cacheKey);