feat(classes): store weekdays and meeting times on the class

Keep the class schedule on the class itself so SMS and listings do not have to infer days and hours from sessions.

utils/classSchedule.js

@@ -39,6 +39,37 @@ const joinFaList = (items) => {
   return `${items.slice(0, -1).join('، ')} و ${items[items.length - 1]}`;
 };
 
+const normalizeWeekdays = (days) => {
+  if (!Array.isArray(days)) return [];
+  const unique = [];
+  const seen = new Set();
+  for (const value of days) {
+    const index = Number(value);
+    if (!Number.isInteger(index) || index < 0 || index > 6 || seen.has(index)) continue;
+    seen.add(index);
+    unique.push(index);
+  }
+  unique.sort((a, b) => IRAN_WEEK_ORDER.indexOf(a) - IRAN_WEEK_ORDER.indexOf(b));
+  return unique;
+};
+
+const normalizeClockTime = (value) => {
+  if (value == null) return '';
+  const raw = String(value).trim();
+  if (!raw) return '';
+  const match = raw.match(/^(\d{1,2})(?::(\d{1,2}))?$/);
+  if (!match) return '';
+  const hours = Number(match[1]);
+  const minutes = Number(match[2] || 0);
+  if (hours > 23 || minutes > 59) return '';
+  return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`;
+};
+
+const formatClassDaysFromIndexes = (days = []) => {
+  const indexes = normalizeWeekdays(days);
+  return joinFaList(indexes.map((index) => PERSIAN_WEEKDAYS[index]).filter(Boolean));
+};
+
 const formatClassDays = (sessions = []) => {
   const indexes = [];
   const seen = new Set();
@@ -48,8 +79,7 @@ const formatClassDays = (sessions = []) => {
     seen.add(dayIndex);
     indexes.push(dayIndex);
   }
-  indexes.sort((a, b) => IRAN_WEEK_ORDER.indexOf(a) - IRAN_WEEK_ORDER.indexOf(b));
-  return joinFaList(indexes.map((index) => PERSIAN_WEEKDAYS[index]).filter(Boolean));
+  return formatClassDaysFromIndexes(indexes);
 };
 
 const formatClassStartDate = (value) => {
@@ -69,17 +99,24 @@ const buildClassScheduleContext = (classDoc, sessions = [], currentSession = nul
     return left - right;
   });
   const sessionForTime = currentSession || sortedSessions[0] || null;
+  const storedDays = formatClassDaysFromIndexes(classDoc?.days);
+  const storedTime = formatCourseTime(classDoc?.startTime, classDoc?.endTime);
 
   return {
     classStartDate: formatClassStartDate(classDoc?.startDate || sortedSessions[0]?.day),
-    classDays: formatClassDays(sortedSessions),
-    courseTime: formatCourseTime(sessionForTime?.startTime, sessionForTime?.endTime)
+    classDays: storedDays || formatClassDays(sortedSessions),
+    courseTime: storedTime || formatCourseTime(sessionForTime?.startTime, sessionForTime?.endTime)
   };
 };
 
 module.exports = {
+  IRAN_WEEK_ORDER,
+  PERSIAN_WEEKDAYS,
   formatCourseTime,
   formatClassDays,
+  formatClassDaysFromIndexes,
   formatClassStartDate,
+  normalizeWeekdays,
+  normalizeClockTime,
   buildClassScheduleContext
 };