"use client";

import { useEffect, useState } from "react";
import { X, Rocket } from "lucide-react";
import { useLocale } from "next-intl";
import { cn } from "@/lib/utils";

// 1 Tir 1405 = June 22, 2026 (Tehran, UTC+3:30)
const LAUNCH_DATE = new Date("2026-06-22T00:00:00+03:30");
const DISMISS_KEY = "meezi_launch_banner_v3";

interface TimeLeft {
  days: number;
  hours: number;
  minutes: number;
  seconds: number;
  expired: boolean;
}

function calcTimeLeft(): TimeLeft {
  const diff = LAUNCH_DATE.getTime() - Date.now();
  if (diff <= 0) return { days: 0, hours: 0, minutes: 0, seconds: 0, expired: true };
  const days    = Math.floor(diff / 86_400_000);
  const hours   = Math.floor((diff % 86_400_000) / 3_600_000);
  const minutes = Math.floor((diff % 3_600_000) / 60_000);
  const seconds = Math.floor((diff % 60_000) / 1_000);
  return { days, hours, minutes, seconds, expired: false };
}

function pad(n: number) {
  return String(n).padStart(2, "0");
}

export function LaunchCountdownSection() {
  const locale = useLocale();
  const isFa = locale === "fa";

  const [visible, setVisible] = useState(false);
  const [timeLeft, setTimeLeft] = useState<TimeLeft>(calcTimeLeft);

  useEffect(() => {
    if (localStorage.getItem(DISMISS_KEY) === "1") return;
    if (calcTimeLeft().expired) return;
    setVisible(true);
  }, []);

  useEffect(() => {
    if (!visible) return;
    const id = setInterval(() => {
      const tl = calcTimeLeft();
      setTimeLeft(tl);
      if (tl.expired) setVisible(false);
    }, 1_000);
    return () => clearInterval(id);
  }, [visible]);

  if (!visible) return null;

  function dismiss() {
    localStorage.setItem(DISMISS_KEY, "1");
    setVisible(false);
  }

  const { days, hours, minutes, seconds } = timeLeft;

  return (
    <section
      dir={isFa ? "rtl" : "ltr"}
      data-launch-countdown
      aria-label={isFa ? "شمارش معکوس راه‌اندازی" : "Launch countdown"}
      className="border-b border-gray-100 bg-gradient-to-b from-brand-50/80 to-white pt-24 pb-10 sm:pt-28 sm:pb-12"
    >
      <div className="mx-auto max-w-4xl px-4 sm:px-6 lg:px-8">
        <div className="relative overflow-hidden rounded-2xl border border-brand-700/15 bg-white p-6 shadow-sm sm:p-8">
          <button
            onClick={dismiss}
            aria-label={isFa ? "بستن" : "Dismiss"}
            className="absolute end-4 top-4 rounded-lg p-1.5 text-gray-400 transition hover:bg-gray-100 hover:text-gray-600 focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-700"
          >
            <X className="h-4 w-4" />
          </button>

          <div className="flex flex-col items-center gap-6 text-center">
            <div className="flex flex-col items-center gap-2">
              <span className="inline-flex items-center gap-1.5 rounded-full bg-brand-50 px-3 py-1 text-xs font-semibold uppercase tracking-wider text-brand-700">
                <Rocket className="h-3.5 w-3.5" />
                {isFa ? "راه‌اندازی رسمی" : "Official launch"}
              </span>
              <p className="max-w-2xl text-base font-medium text-gray-900 sm:text-lg">
                {isFa
                  ? "میزی رسماً ۱ تیر ۱۴۰۵ برای همه کاربران راه‌اندازی می‌شود"
                  : "Meezi officially launches for all users on June 22, 2026"}
              </p>
            </div>

            <div className="grid w-full max-w-md grid-cols-4 gap-3 sm:gap-4">
              <CountdownUnit value={days}    label={isFa ? "روز"   : "Days"} />
              <CountdownUnit value={hours}   label={isFa ? "ساعت"  : "Hours"} />
              <CountdownUnit value={minutes} label={isFa ? "دقیقه" : "Min"} />
              <CountdownUnit value={seconds} label={isFa ? "ثانیه" : "Sec"} />
            </div>

            <a
              href={`https://app.meezi.ir/${locale}/register`}
              className={cn(
                "inline-flex items-center justify-center rounded-xl bg-brand-700 px-6 py-3 text-sm font-semibold text-white",
                "transition hover:bg-brand-800 focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-700 focus-visible:ring-offset-2"
              )}
            >
              {isFa ? "ثبت‌نام رایگان" : "Register free"}
            </a>
          </div>
        </div>
      </div>
    </section>
  );
}

function CountdownUnit({ value, label }: { value: number; label: string }) {
  return (
    <div className="flex flex-col items-center rounded-xl border border-gray-100 bg-gray-50 px-2 py-3 sm:px-3 sm:py-4">
      <span className="font-mono text-2xl font-bold tabular-nums text-brand-700 sm:text-3xl">
        {pad(value)}
      </span>
      <span className="mt-1 text-[11px] font-medium text-gray-500">{label}</span>
    </div>
  );
}
