"use client";

import { useEffect, useState } from "react";
import { useLocale } from "next-intl";
import { useRouter } from "@/i18n/routing";
import { Clock, X, Zap } from "lucide-react";

// 1 Tir 1405 = June 22, 2026  (Tehran IRDT UTC+4:30)
const DEADLINE = new Date("2026-06-22T00:00:00+04:30");
const STORAGE_KEY = "meezi_trial_banner_v1";

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

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

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

export function TrialCountdownBanner() {
  const locale  = useLocale();
  const router  = useRouter();
  const isRtl   = locale !== "en";

  // Start hidden — reveal after mount so we can read localStorage without SSR mismatch
  const [visible, setVisible]   = useState(false);
  const [timeLeft, setTimeLeft] = useState<TimeLeft>(calcTimeLeft);
  const [expired, setExpired]   = useState(false);

  // Hydrate visibility from localStorage
  useEffect(() => {
    if (localStorage.getItem(STORAGE_KEY) !== "1") {
      setVisible(true);
    }
  }, []);

  // Tick every second
  useEffect(() => {
    if (!visible) return;
    const id = setInterval(() => {
      const tl = calcTimeLeft();
      setTimeLeft(tl);
      if (tl.days === 0 && tl.hours === 0 && tl.minutes === 0 && tl.seconds === 0) {
        setExpired(true);
      }
    }, 1_000);
    return () => clearInterval(id);
  }, [visible]);

  if (!visible) return null;

  const dismiss = () => {
    setVisible(false);
    localStorage.setItem(STORAGE_KEY, "1");
  };

  const urgency = timeLeft.days <= 3;   // red when ≤ 3 days left
  const soon    = timeLeft.days <= 7;   // amber when ≤ 7 days left

  const bgClass = urgency
    ? "bg-red-600"
    : soon
      ? "bg-amber-500"
      : "bg-[#0F6E56]";

  const textFa = expired
    ? "دوره آزمایشی میزی به پایان رسید. برای ادامه پلن انتخاب کنید."
    : "دوره آزمایشی رایگان تا ۱ تیر ۱۴۰۵";

  const textEn = expired
    ? "Your Meezi trial has ended. Choose a plan to continue."
    : "Free trial ends 1 Tir 1405 (Jun 22)";

  const Digit = ({ value, label }: { value: number; label: string }) => (
    <div className="flex flex-col items-center">
      <span className="min-w-[2.25rem] rounded-md bg-white/20 px-2 py-0.5 text-center text-base font-extrabold tabular-nums leading-tight text-white sm:text-lg">
        {pad(value)}
      </span>
      <span className="mt-0.5 text-[10px] font-medium text-white/70">{label}</span>
    </div>
  );

  const labelsFa = ["روز", "ساعت", "دقیقه", "ثانیه"];
  const labelsEn = ["d",   "h",    "m",     "s"];
  const labels   = isRtl ? labelsFa : labelsEn;

  return (
    <div
      className={`relative flex flex-wrap items-center gap-x-4 gap-y-2 px-4 py-2 sm:px-6 ${bgClass} transition-colors duration-700`}
      role="banner"
      aria-live="polite"
    >
      {/* Icon + message */}
      <div className="flex items-center gap-2 text-white">
        <Clock className="h-4 w-4 shrink-0 opacity-80" />
        <span className="text-xs font-semibold sm:text-sm">
          {isRtl ? textFa : textEn}
        </span>
      </div>

      {/* Countdown digits */}
      {!expired && (
        <div className="flex items-end gap-2">
          <Digit value={timeLeft.days}    label={labels[0]} />
          <span className="mb-3 text-white/60 font-bold">:</span>
          <Digit value={timeLeft.hours}   label={labels[1]} />
          <span className="mb-3 text-white/60 font-bold">:</span>
          <Digit value={timeLeft.minutes} label={labels[2]} />
          <span className="mb-3 text-white/60 font-bold">:</span>
          <Digit value={timeLeft.seconds} label={labels[3]} />
        </div>
      )}

      {/* CTA */}
      <button
        onClick={() => router.push("/subscription")}
        className="ms-auto flex items-center gap-1.5 rounded-lg bg-white px-3 py-1.5 text-xs font-bold text-gray-900 shadow-sm transition hover:bg-gray-100 active:scale-95"
      >
        <Zap className="h-3.5 w-3.5 text-amber-500" />
        {isRtl ? "ارتقا به پرو" : "Upgrade to Pro"}
      </button>

      {/* Dismiss */}
      <button
        onClick={dismiss}
        className="shrink-0 rounded p-0.5 text-white/70 transition hover:text-white"
        aria-label={isRtl ? "بستن" : "Dismiss"}
      >
        <X className="h-4 w-4" />
      </button>
    </div>
  );
}