feat: auto generate placeholder nationalId for users and professors, auto calculate class end date

utils/classSchedule.js

@@ -109,6 +109,31 @@ const buildClassScheduleContext = (classDoc, sessions = [], currentSession = nul
   };
 };
 
+const calculateClassEndDate = (startDate, days = [], numberOfSessions = 0) => {
+  const date = toDate(startDate);
+  const countNeeded = parseInt(numberOfSessions, 10);
+  if (!date || isNaN(countNeeded) || countNeeded < 1) return null;
+  const validDays = normalizeWeekdays(days);
+  if (!validDays.length) return null;
+
+  let current = new Date(date);
+  let count = 0;
+  let lastMatchingDate = null;
+  let safetyLimit = 365 * 5;
+
+  while (count < countNeeded && safetyLimit > 0) {
+    safetyLimit--;
+    if (validDays.includes(current.getDay())) {
+      count++;
+      lastMatchingDate = new Date(current);
+    }
+    if (count >= countNeeded) break;
+    current.setDate(current.getDate() + 1);
+  }
+
+  return lastMatchingDate;
+};
+
 module.exports = {
   IRAN_WEEK_ORDER,
   PERSIAN_WEEKDAYS,
@@ -118,5 +143,6 @@ module.exports = {
   formatClassStartDate,
   normalizeWeekdays,
   normalizeClockTime,
-  buildClassScheduleContext
+  buildClassScheduleContext,
+  calculateClassEndDate
 };