feat: import class sessions, attendance, and payments from JSON

Match students by name when national ID or phone is missing, parse Jalali dates, and allow sessions without a professor.

utils/jalaliDate.js

@@ -0,0 +1,97 @@
+'use strict';
+
+const toEnglishDigits = (value) =>
+  String(value ?? '')
+    .replace(/[۰-۹]/g, (d) => '۰۱۲۳۴۵۶۷۸۹'.indexOf(d))
+    .replace(/[٠-٩]/g, (d) => '٠١٢٣٤٥٦٧٨٩'.indexOf(d));
+
+const jalaliToGregorian = (jy, jm, jd) => {
+  const gy = jy <= 979 ? 621 : 1600;
+  jy -= jy <= 979 ? 0 : 979;
+  let days =
+    365 * jy +
+    Math.floor(jy / 33) * 8 +
+    Math.floor(((jy % 33) + 3) / 4) +
+    78 +
+    jd +
+    (jm < 7 ? (jm - 1) * 31 : (jm - 7) * 30 + 186);
+  let gyOut = gy + 400 * Math.floor(days / 146097);
+  days %= 146097;
+  if (days > 36524) {
+    gyOut += 100 * Math.floor(--days / 36524);
+    days %= 36524;
+    if (days >= 365) days += 1;
+  }
+  gyOut += 4 * Math.floor(days / 1461);
+  days %= 1461;
+  if (days > 365) {
+    gyOut += Math.floor((days - 1) / 365);
+    days = (days - 1) % 365;
+  }
+  let gd = days + 1;
+  const sal_a = [
+    0,
+    31,
+    (gyOut % 4 === 0 && gyOut % 100 !== 0) || gyOut % 400 === 0 ? 29 : 28,
+    31,
+    30,
+    31,
+    30,
+    31,
+    31,
+    30,
+    31,
+    30,
+    31
+  ];
+  let gm = 0;
+  for (gm = 1; gm <= 12 && gd > sal_a[gm]; gm += 1) gd -= sal_a[gm];
+  return `${gyOut}-${String(gm).padStart(2, '0')}-${String(gd).padStart(2, '0')}`;
+};
+
+const parseJalaliDate = (raw) => {
+  if (!raw) return null;
+  const text = toEnglishDigits(raw).replace(/[./\-]/g, '/').trim();
+  const match = text.match(/^(\d{3,4})\/(\d{1,2})\/(\d{1,2})$/);
+  if (!match) return null;
+  const jy = Number(match[1]);
+  const jm = Number(match[2]);
+  const jd = Number(match[3]);
+  if (!jy || !jm || !jd || jm > 12 || jd > 31 || jy < 1200 || jy > 1599) return null;
+  try {
+    return jalaliToGregorian(jy, jm, jd);
+  } catch {
+    return null;
+  }
+};
+
+const parseImportDate = (raw) => {
+  if (!raw) return null;
+  if (raw instanceof Date) {
+    return Number.isNaN(raw.getTime()) ? null : raw;
+  }
+  const text = String(raw).trim();
+  if (!text) return null;
+  const gregorian = text.match(/^(\d{4}-\d{2}-\d{2})/);
+  if (gregorian) return new Date(`${gregorian[1]}T00:00:00.000Z`);
+  const jalali = parseJalaliDate(text);
+  if (jalali) return new Date(`${jalali}T00:00:00.000Z`);
+  const date = new Date(text);
+  return Number.isNaN(date.getTime()) ? null : date;
+};
+
+const utcDayRange = (value) => {
+  const date = parseImportDate(value);
+  if (!date) return null;
+  const start = new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate()));
+  const end = new Date(start.getTime() + 24 * 60 * 60 * 1000);
+  return { start, end };
+};
+
+module.exports = {
+  toEnglishDigits,
+  jalaliToGregorian,
+  parseJalaliDate,
+  parseImportDate,
+  utcDayRange
+};