nezha_dash/app/(main)/header.tsx

"use client";

import { LanguageSwitcher } from "@/components/LanguageSwitcher";
import { ModeToggle } from "@/components/ThemeSwitcher";
import { Separator } from "@/components/ui/separator";
import { Skeleton } from "@/components/ui/skeleton";
import getEnv from "@/lib/env-entry";
import { DateTime } from "luxon";
import { useTranslations } from "next-intl";
import Image from "next/image";
import { useRouter } from "next/navigation";
import React, { useEffect, useRef, useState } from "react";

function Header() {
  const t = useTranslations("Header");
  const customLogo = getEnv("NEXT_PUBLIC_CustomLogo");
  const customTitle = getEnv("NEXT_PUBLIC_CustomTitle");
  const customDescription = getEnv("NEXT_PUBLIC_CustomDescription");

  const router = useRouter();

  return (
    <div className="mx-auto w-full max-w-5xl">
      <section className="flex items-center justify-between">
        <section
          onClick={() => {
            sessionStorage.removeItem("selectedTag");
            router.push(`/`);
          }}
          className="flex cursor-pointer items-center text-base font-medium"
        >
          <div className="mr-1 flex flex-row items-center justify-start">
            <Image
              width={40}
              height={40}
              unoptimized
              alt="apple-touch-icon"
              src={customLogo ? customLogo : "/apple-touch-icon.png"}
              className="relative !m-0 border-2 border-transparent h-6 w-6 object-cover object-top !p-0"
            />
          </div>
          {customTitle ? customTitle : "NezhaDash"}
          <Separator
            orientation="vertical"
            className="mx-2 hidden h-4 w-[1px] md:block"
          />
          <p className="hidden text-sm font-medium opacity-40 md:block">
            {customDescription
              ? customDescription
              : t("p_1079-1199_Simpleandbeautifuldashbo")}
          </p>
        </section>
        <section className="flex items-center gap-2">
          <LanguageSwitcher />
          <ModeToggle />
        </section>
      </section>
      <Overview />
    </div>
  );
}

// https://github.com/streamich/react-use/blob/master/src/useInterval.ts
const useInterval = (callback: () => void, delay: number | null) => {
  const savedCallback = useRef<() => void>(() => {});
  useEffect(() => {
    savedCallback.current = callback;
  });
  useEffect(() => {
    if (delay !== null) {
      const interval = setInterval(() => savedCallback.current(), delay || 0);
      return () => clearInterval(interval);
    }
    return undefined;
  }, [delay]);
};
function Overview() {
  const t = useTranslations("Overview");
  const [mouted, setMounted] = useState(false);
  useEffect(() => {
    setMounted(true);
  }, []);
  const timeOption = DateTime.TIME_SIMPLE;
  timeOption.hour12 = true;
  const [timeString, setTimeString] = useState(
    DateTime.now().setLocale("en-US").toLocaleString(timeOption),
  );
  useInterval(() => {
    setTimeString(DateTime.now().setLocale("en-US").toLocaleString(timeOption));
  }, 1000);
  return (
    <section className={"mt-10 flex flex-col md:mt-16"}>
      <p className="text-base font-semibold">{t("p_2277-2331_Overview")}</p>
      <div className="flex items-center gap-1.5">
        <p className="text-sm font-medium opacity-50">
          {t("p_2390-2457_wherethetimeis")}
        </p>
        {mouted ? (
          <p className="opacity-1 text-sm font-medium">{timeString}</p>
        ) : (
          <Skeleton className="h-[20px] w-[50px] rounded-[5px] bg-muted-foreground/10 animate-none"></Skeleton>
        )}
      </div>
    </section>
  );
}
export default Header;