"use client";

import Image from "next/image";
import { useEffect, useState } from "react";
import type { ProductComment, ProductDetail } from "@/data/product-detail";

type TabId = "technical" | "comments" | "sizing";

const TABS: Array<{ id: TabId; labelFa: string; labelEn: string }> = [
  { id: "technical", labelFa: "مشخصات فنی", labelEn: "Technical info" },
  { id: "comments", labelFa: "نظرات", labelEn: "Comments" },
  { id: "sizing", labelFa: "راهنمای سایز", labelEn: "Sizing guide" },
];

type ProductTabsProps = {
  product: ProductDetail;
  initialTab?: TabId;
};

function Stars({ rating }: { rating: number }) {
  return (
    <span dir="ltr" className="font-montserrat text-xs tracking-widest text-ink" aria-label={`${rating} از ۵`}>
      {"★".repeat(Math.max(0, Math.min(5, rating)))}
      <span className="text-muted">{"★".repeat(Math.max(0, 5 - rating))}</span>
    </span>
  );
}

function CommentsList({ comments }: { comments: ProductComment[] }) {
  if (!comments.length) {
    return (
      <p className="text-sm text-muted">هنوز نظری ثبت نشده است.</p>
    );
  }
  return (
    <ul className="space-y-4">
      {comments.map((c) => (
        <li key={c.id} className="border border-line bg-white p-4">
          <div className="flex flex-wrap items-center justify-between gap-2">
            <p className="text-sm text-ink">{c.author}</p>
            <Stars rating={c.rating} />
          </div>
          <p dir="ltr" className="mt-1 font-montserrat text-[10px] text-muted">
            {c.date}
          </p>
          <p className="mt-3 text-sm leading-7 text-ink/80">{c.body}</p>
        </li>
      ))}
    </ul>
  );
}

export default function ProductTabs({
  product,
  initialTab = "technical",
}: ProductTabsProps) {
  const [tab, setTab] = useState<TabId>(initialTab);

  useEffect(() => {
    const onHash = () => {
      if (window.location.hash === "#product-tabs") {
        setTab("sizing");
      }
    };
    onHash();
    window.addEventListener("hashchange", onHash);
    return () => window.removeEventListener("hashchange", onHash);
  }, []);

  return (
    <section id="product-tabs" className="scroll-mt-28 border-t border-line pt-10">
      <div className="flex flex-wrap gap-2 border-b border-line pb-px">
        {TABS.map((t) => {
          const active = tab === t.id;
          return (
            <button
              key={t.id}
              type="button"
              onClick={() => setTab(t.id)}
              className={`-mb-px border-b-2 px-3 py-3 text-start transition-colors sm:px-4 ${
                active
                  ? "border-ink text-ink"
                  : "border-transparent text-muted hover:text-ink"
              }`}
              aria-selected={active}
              role="tab"
            >
              <span className="block text-sm sm:text-base">{t.labelFa}</span>
              <span
                dir="ltr"
                className="mt-0.5 block font-montserrat text-[10px] tracking-[0.12em] uppercase opacity-70"
              >
                {t.labelEn}
              </span>
            </button>
          );
        })}
      </div>

      <div className="py-8" role="tabpanel">
        {tab === "technical" ? (
          <div className="space-y-6">
            <p className="max-w-3xl text-sm leading-7 text-ink/75">
              {product.description}
            </p>
            <dl className="divide-y divide-line border border-line">
              {product.technical.map((row) => (
                <div
                  key={row.labelEn}
                  className="grid grid-cols-1 gap-1 px-4 py-3 sm:grid-cols-[minmax(0,11rem)_1fr] sm:items-baseline sm:gap-6"
                >
                  <dt>
                    <span className="text-sm text-ink">{row.labelFa}</span>
                    <span
                      dir="ltr"
                      className="mt-0.5 block font-montserrat text-[10px] tracking-wide text-muted"
                    >
                      {row.labelEn}
                    </span>
                  </dt>
                  <dd className="text-sm text-ink/80 sm:text-end">{row.value}</dd>
                </div>
              ))}
            </dl>
          </div>
        ) : null}

        {tab === "comments" ? (
          <CommentsList comments={product.comments} />
        ) : null}

        {tab === "sizing" ? (
          <div className="grid gap-6 lg:grid-cols-[minmax(0,1.1fr)_minmax(0,0.9fr)] lg:items-start">
            <div className="relative aspect-[4/5] overflow-hidden rounded-[5px] border border-line bg-[#f6f6f4]">
              {product.sizeGuideImage ? (
                <Image
                  src={product.sizeGuideImage}
                  alt="راهنمای سایز"
                  fill
                  sizes="(max-width: 1024px) 100vw, 520px"
                  className="object-cover object-top"
                />
              ) : (
                <span className="absolute inset-0 flex items-center justify-center text-sm text-muted">
                  Size guide image
                </span>
              )}
            </div>
            <div>
              <h3 className="font-doran text-xl text-ink">جدول اندازه‌ها</h3>
              <p
                dir="ltr"
                className="mt-1 font-montserrat text-[10px] uppercase tracking-[0.16em] text-muted"
              >
                Measurements (cm)
              </p>
              <p className="mt-3 text-sm leading-7 text-ink/75">
                {product.sizeGuideNote}
              </p>
              <div className="mt-5 overflow-x-auto border border-line">
                <table className="w-full min-w-[320px] text-sm">
                  <thead className="bg-[#f7f7f5] text-muted">
                    <tr>
                      <th className="px-3 py-2.5 text-start font-normal">سایز</th>
                      <th className="px-3 py-2.5 text-start font-normal">سینه</th>
                      <th className="px-3 py-2.5 text-start font-normal">کمر</th>
                      <th className="px-3 py-2.5 text-start font-normal">قد</th>
                    </tr>
                  </thead>
                  <tbody>
                    {[
                      ["S", "۸۸", "۷۰", "۹۲"],
                      ["M", "۹۲", "۷۴", "۹۵"],
                      ["L", "۹۶", "۷۸", "۹۸"],
                      ["XL", "۱۰۰", "۸۲", "۱۰۰"],
                    ].map((row) => (
                      <tr key={row[0]} className="border-t border-line">
                        {row.map((cell) => (
                          <td key={cell} className="px-3 py-2.5 text-ink">
                            {cell}
                          </td>
                        ))}
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </div>
          </div>
        ) : null}
      </div>
    </section>
  );
}