"use client";

import Image from "next/image";
import Link from "next/link";
import { FormEvent, useEffect, useRef, useState } from "react";
import { categoryPath } from "@/lib/category-path";
import { productPath } from "@/lib/product-path";
import { API_URL, STORE_SLUG } from "@/lib/public-api";

type SearchHit = {
  id: number | string;
  nameFa: string;
  nameEn: string;
  imageUrl?: string | null;
  price?: number;
};

type CategoryHit = {
  id: number;
  nameFa: string;
  nameEn: string;
};

export default function HeaderSearch() {
  const [open, setOpen] = useState(false);
  const [q, setQ] = useState("");
  const [loading, setLoading] = useState(false);
  const [products, setProducts] = useState<SearchHit[]>([]);
  const [categories, setCategories] = useState<CategoryHit[]>([]);
  const inputRef = useRef<HTMLInputElement>(null);
  const panelRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!open) return;
    inputRef.current?.focus();
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") setOpen(false);
    };
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, [open]);

  useEffect(() => {
    if (!open) return;
    const query = q.trim();
    if (query.length < 2) {
      setProducts([]);
      setCategories([]);
      return;
    }
    const t = window.setTimeout(async () => {
      setLoading(true);
      try {
        const params = new URLSearchParams({
          storeSlug: STORE_SLUG,
          q: query,
          limit: "8",
        });
        const res = await fetch(`${API_URL}/public/search?${params}`);
        if (!res.ok) throw new Error("search failed");
        const data = (await res.json()) as {
          products?: SearchHit[];
          categories?: CategoryHit[];
        };
        setProducts(data.products ?? []);
        setCategories(data.categories ?? []);
      } catch {
        setProducts([]);
        setCategories([]);
      } finally {
        setLoading(false);
      }
    }, 280);
    return () => window.clearTimeout(t);
  }, [q, open]);

  function handleSubmit(e: FormEvent) {
    e.preventDefault();
    const query = q.trim();
    if (!query) return;
    setOpen(false);
    window.location.href = `/products?q=${encodeURIComponent(query)}`;
  }

  return (
    <>
      <button
        type="button"
        aria-label="جستجو"
        aria-expanded={open}
        className="transition-opacity hover:opacity-70"
        onClick={() => setOpen(true)}
      >
        <Image
          src="/images/home/icons/search.svg"
          alt=""
          width={20}
          height={20}
          unoptimized
        />
      </button>

      {open ? (
        <div className="fixed inset-0 z-[70]">
          <button
            type="button"
            className="absolute inset-0 bg-ink/40"
            aria-label="بستن جستجو"
            onClick={() => setOpen(false)}
          />
          <div
            ref={panelRef}
            className="absolute inset-x-0 top-0 bg-white shadow-[0_12px_40px_rgba(0,0,0,0.12)]"
          >
            <form
              onSubmit={handleSubmit}
              className="mx-auto flex max-w-[900px] items-center gap-3 px-4 py-4 sm:px-6"
              dir="rtl"
            >
              <Image
                src="/images/home/icons/search.svg"
                alt=""
                width={18}
                height={18}
                unoptimized
              />
              <input
                ref={inputRef}
                value={q}
                onChange={(e) => setQ(e.target.value)}
                placeholder="جستجوی محصول یا دسته‌بندی..."
                className="min-w-0 flex-1 bg-transparent text-sm outline-none placeholder:text-muted"
              />
              <button
                type="button"
                onClick={() => setOpen(false)}
                className="text-sm text-muted hover:text-ink"
              >
                بستن
              </button>
            </form>

            <div className="mx-auto max-w-[900px] border-t border-line px-4 py-4 sm:px-6">
              {loading ? (
                <p className="text-sm text-muted">در حال جستجو...</p>
              ) : q.trim().length < 2 ? (
                <p className="text-sm text-muted">
                  حداقل ۲ حرف وارد کنید.
                </p>
              ) : !products.length && !categories.length ? (
                <p className="text-sm text-muted">نتیجه‌ای یافت نشد.</p>
              ) : (
                <div className="grid gap-6 sm:grid-cols-2">
                  {categories.length ? (
                    <div>
                      <p className="mb-2 text-xs text-muted">دسته‌بندی‌ها</p>
                      <ul className="space-y-1">
                        {categories.map((c) => (
                          <li key={c.id}>
                            <Link
                              href={categoryPath(c)}
                              onClick={() => setOpen(false)}
                              className="block border border-transparent px-2 py-2 text-sm hover:border-line hover:bg-[#f7f7f5]"
                            >
                              {c.nameFa}
                              {c.nameEn ? (
                                <span
                                  dir="ltr"
                                  className="ms-2 font-montserrat text-[10px] text-muted"
                                >
                                  {c.nameEn}
                                </span>
                              ) : null}
                            </Link>
                          </li>
                        ))}
                      </ul>
                    </div>
                  ) : null}
                  {products.length ? (
                    <div>
                      <p className="mb-2 text-xs text-muted">محصولات</p>
                      <ul className="space-y-1">
                        {products.map((p) => (
                          <li key={p.id}>
                            <Link
                              href={productPath(p)}
                              onClick={() => setOpen(false)}
                              className="flex items-center gap-3 border border-transparent px-2 py-2 hover:border-line hover:bg-[#f7f7f5]"
                            >
                              <span className="relative h-12 w-10 shrink-0 overflow-hidden bg-[#f3f3f1]">
                                {/* eslint-disable-next-line @next/next/no-img-element */}
                                <img
                                  src={
                                    p.imageUrl ||
                                    "/images/home/products/coat-blue.jpg"
                                  }
                                  alt=""
                                  className="h-full w-full object-cover"
                                />
                              </span>
                              <span className="min-w-0">
                                <span className="block truncate text-sm text-ink">
                                  {p.nameFa}
                                </span>
                                <span
                                  dir="ltr"
                                  className="block truncate font-montserrat text-[10px] text-muted"
                                >
                                  {p.nameEn}
                                </span>
                              </span>
                            </Link>
                          </li>
                        ))}
                      </ul>
                    </div>
                  ) : null}
                </div>
              )}
            </div>
          </div>
        </div>
      ) : null}
    </>
  );
}