"use client";

import Link from "next/link";
import { useParams } from "next/navigation";
import { useEffect, useState } from "react";

import { ApiKeyGate } from "@/components/ApiKeyGate";
import { StudyFeed } from "@/components/StudyFeed";
import { Button } from "@/components/ui";
import { useI18n } from "@/lib/i18n";
import type { Deck } from "@/lib/schemas";
import { getDeck } from "@/lib/storage";

export default function DeckPage() {
  const params = useParams<{ id: string }>();
  const id = typeof params.id === "string" ? params.id : "";
  const [deck, setDeck] = useState<Deck | null>(null);
  const [loaded, setLoaded] = useState(false);
  const { t } = useI18n();

  useEffect(() => {
    if (!id) {
      setLoaded(true);
      return;
    }
    setDeck(getDeck(id) ?? null);
    setLoaded(true);
  }, [id]);

  if (!loaded) {
    return (
      <main className="frost-bg grid min-h-dvh place-items-center px-4">
        <div className="w-full max-w-xl space-y-4" aria-busy="true" aria-label={t("deckPage.loading")}>
          <div className="flex items-center gap-3">
            <div className="skeleton size-9 rounded-xl" />
            <div className="skeleton h-2 flex-1 rounded-full" />
          </div>
          <div className="skeleton h-24 rounded-3xl" />
          <div className="skeleton h-12 rounded-2xl" />
          <div className="skeleton h-12 w-2/3 rounded-2xl" />
        </div>
      </main>
    );
  }

  if (!deck) {
    return (
      <main className="frost-bg grid min-h-dvh place-items-center px-4">
        <div className="card relative max-w-md space-y-3 p-6 text-center">
          <p className="text-4xl" aria-hidden>
            🧊
          </p>
          <h1 className="text-xl font-extrabold text-frost-950 dark:text-frost-50">{t("deckPage.notFound")}</h1>
          <p className="text-sm text-frost-600 dark:text-frost-300">
            {t("deckPage.notFoundBody")}
          </p>
          <div className="flex justify-center gap-2 pt-1">
            <Link
              href="/"
              className="inline-flex items-center gap-2 rounded-2xl bg-accent-600 px-4 py-2.5 text-sm font-semibold text-white transition-colors hover:bg-accent-700"
            >
              {t("deckPage.back")}
            </Link>
            <Link href="/create">
              <Button variant="secondary">{t("deckPage.create")}</Button>
            </Link>
          </div>
        </div>
      </main>
    );
  }

  return (
    <ApiKeyGate>
      <StudyFeed key={deck.id} deck={deck} />
    </ApiKeyGate>
  );
}