feat(appointment): grey out unavailable days on the booking calendar

DatePicker now loads month-availability for the two displayed Jalali
months (mapped to the Gregorian months they span, fetched once and
cached per month) and disables any day in disabled_dates plus past
days. Auto-select skips disabled days. When the doctor has online
booking turned off, show a notice instead of the calendar. doctorUuid
comes from the route params.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/component/date/datePicker/index.js

@@ -1,20 +1,75 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
+import { useParams } from "next/navigation";
 import moment from "moment-jalaali";
 import "moment-timezone";
 import { dateToTimestamp } from "@/helper";
+import { request } from "@/services/response";
 import InlineJalaliMonth from "@/components/common/InlineJalaliMonth";
 
-function DatePicker({ setDate, disabledDates = [] }) {
+function gregorianMonthsOf(jalaliMonth) {
+  const first = moment(jalaliMonth).startOf("jMonth");
+  const last = moment(jalaliMonth).endOf("jMonth");
+  const keys = new Set();
+  for (const d of [first, last]) {
+    keys.add(`${d.year()}-${d.month() + 1}`);
+  }
+  return [...keys].map((k) => {
+    const [year, month] = k.split("-").map(Number);
+    return { year, month };
+  });
+}
+
+function DatePicker({ setDate }) {
+  const params = useParams();
+  const doctorUuid = params?.doctorId;
+
   const [baseMonth, setBaseMonth] = useState(moment().tz("Asia/Tehran"));
   const [selectedDate, setSelectedDate] = useState(null);
   const [autoSelected, setAutoSelected] = useState(false);
+  const [disabledSet, setDisabledSet] = useState(() => new Set());
+  const [onlineEnabled, setOnlineEnabled] = useState(true);
+  const loadedMonths = useRef(new Set());
+
+  const secondMonth = moment(baseMonth).add(1, "jMonth");
+
+  useEffect(() => {
+    if (!doctorUuid) return;
+
+    const targets = [
+      ...gregorianMonthsOf(baseMonth),
+      ...gregorianMonthsOf(secondMonth),
+    ].filter(({ year, month }) => !loadedMonths.current.has(`${year}-${month}`));
+
+    if (targets.length === 0) return;
+
+    targets.forEach(({ year, month }) => {
+      loadedMonths.current.add(`${year}-${month}`);
+      request
+        .getMonthAvailability(doctorUuid, year, month)
+        .then((res) => {
+          const data = res?.data ?? {};
+          if (data.online_booking_enabled === false) setOnlineEnabled(false);
+          const dates = Array.isArray(data.disabled_dates) ? data.disabled_dates : [];
+          if (dates.length) {
+            setDisabledSet((prev) => {
+              const next = new Set(prev);
+              dates.forEach((d) => next.add(d));
+              return next;
+            });
+          }
+        })
+        .catch(() => {
+          loadedMonths.current.delete(`${year}-${month}`);
+        });
+    });
+  }, [doctorUuid, baseMonth]);
 
   const isDisabled = (date) => {
     const day = moment(date).startOf("day");
     if (day.isBefore(moment().startOf("day"))) return true;
-    return disabledDates.some((ts) => day.isSame(moment.unix(ts).startOf("day")));
+    return disabledSet.has(day.format("YYYY-MM-DD"));
   };
 
   const selectDay = (date) => {
@@ -27,7 +82,7 @@ function DatePicker({ setDate, disabledDates = [] }) {
     if (autoSelected) return;
 
     const today = moment().tz("Asia/Tehran");
-    for (let i = 0; i <= 30; i++) {
+    for (let i = 0; i <= 60; i++) {
       const candidate = today.clone().add(i, "days");
       if (!isDisabled(candidate)) {
         setSelectedDate(candidate);
@@ -37,9 +92,15 @@ function DatePicker({ setDate, disabledDates = [] }) {
         break;
       }
     }
-  }, [disabledDates, autoSelected, setDate]);
+  }, [disabledSet, autoSelected, setDate]);
 
-  const secondMonth = moment(baseMonth).add(1, "jMonth");
+  if (!onlineEnabled) {
+    return (
+      <div className="w-full py-[40px] text-center text-[#525252] text-[14px] md:text-[16px] font-medium">
+        نوبت‌دهی آنلاین این پزشک در حال حاضر غیرفعال است.
+      </div>
+    );
+  }
 
   return (
     <div dir="rtl" className="datePickerApt flex items-start justify-evenly gap-[24px] w-full">