feat(booking): add validation to prevent past bookings and implement slot validation logic

apps/backend/src/lib/slot-validator.ts

@@ -0,0 +1,34 @@
+function toMinutes(value: string): number {
+  const [hours, minutes] = value.split(':').map((part) => Number(part));
+  return hours * 60 + minutes;
+}
+
+export function isSlotInPast(
+  bookingDate: Date,
+  startTime: string,
+  slotDurationMinutes: number,
+  now?: Date
+): boolean {
+  const currentTime = now ?? new Date();
+
+  const todayStart = new Date(
+    currentTime.getFullYear(),
+    currentTime.getMonth(),
+    currentTime.getDate()
+  );
+
+  const bookingLocalStart = new Date(
+    bookingDate.getUTCFullYear(),
+    bookingDate.getUTCMonth(),
+    bookingDate.getUTCDate()
+  );
+
+  if (bookingLocalStart < todayStart) return true;
+  if (bookingLocalStart > todayStart) return false;
+
+  const currentMinutes = currentTime.getHours() * 60 + currentTime.getMinutes();
+  const slotStartMinutes = toMinutes(startTime);
+  const elapsed = currentMinutes - slotStartMinutes;
+
+  return elapsed > slotDurationMinutes / 2;
+}

apps/backend/src/modules/admin-booking/services/admin-booking.service.ts

@@ -1,6 +1,7 @@
 import { randomInt } from 'node:crypto';
 import { CourtBookingStatus } from '@/generated/prisma/enums';
 import { db } from '@/lib/prisma';
+import { isSlotInPast } from '@/lib/slot-validator';
 import { evaluatePlanUsage, parsePlanRules } from '@/modules/plan/services/plan-rules.service';
 import type { DayOfWeek } from '@repo/api-contract';
 import type {
@@ -361,6 +362,10 @@ export async function createAdminBooking(
     );
   }
 
+  if (isSlotInPast(bookingDate, input.startTime, court.slotDurationMinutes)) {
+    throw new AdminBookingServiceError('No se pueden crear reservas en el pasado.', 400);
+  }
+
   for (let attempt = 0; attempt < 5; attempt += 1) {
     try {
       const booking = await db.$transaction(async (tx) => {

apps/backend/src/modules/public-booking/services/public-booking.service.ts

@@ -1,5 +1,6 @@
 import { randomInt } from 'node:crypto';
 import { db } from '@/lib/prisma';
+import { isSlotInPast } from '@/lib/slot-validator';
 import { evaluatePlanUsage, parsePlanRules } from '@/modules/plan/services/plan-rules.service';
 import type {
   CancelPublicBookingInput,
@@ -574,6 +575,10 @@ export async function createPublicBooking(complexSlug: string, input: CreatePubl
     );
   }
 
+  if (isSlotInPast(bookingDate, input.startTime, selectedCourt.slotDurationMinutes)) {
+    throw new PublicBookingServiceError('No se pueden crear reservas en el pasado.', 400);
+  }
+
   for (let attempt = 0; attempt < 5; attempt += 1) {
     try {
       const booking = await db.$transaction(async (tx) => {