"use client";

import Link from "next/link";
import { useEffect, useId, useRef, useState } from "react";
import type { Product } from "@/lib/data";
import { formatPrice } from "@/lib/format";
import { IconSearch } from "./Icons";
import { Media } from "./Media";

type Props = {
  className?: string;
  onNavigate?: () => void;
};

export function SearchBox({ className = "", onNavigate }: Props) {
  const listId = useId();
  const root = useRef<HTMLDivElement>(null);
  const [query, setQuery] = useState("");
  const [items, setItems] = useState<Product[]>([]);
  const [open, setOpen] = useState(false);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    const term = query.trim();
    if (term.length < 2) {
      setItems([]);
      setLoading(false);
      setOpen(false);
      return;
    }

    const controller = new AbortController();
    const timer = window.setTimeout(async () => {
      setLoading(true);
      try {
        const response = await fetch(`/api/search?q=${encodeURIComponent(term)}`, { signal: controller.signal });
        const data = (await response.json()) as { items?: Product[] };
        setItems(data.items ?? []);
        setOpen(true);
      } catch (error) {
        if ((error as { name?: string }).name !== "AbortError") {
          setItems([]);
          setOpen(true);
        }
      } finally {
        setLoading(false);
      }
    }, 160);

    return () => {
      window.clearTimeout(timer);
      controller.abort();
    };
  }, [query]);

  useEffect(() => {
    const onPointer = (event: MouseEvent) => {
      if (!root.current?.contains(event.target as Node)) setOpen(false);
    };
    document.addEventListener("mousedown", onPointer);
    return () => document.removeEventListener("mousedown", onPointer);
  }, []);

  return (
    <div ref={root} className={`relative ${className}`}>
      <form action="/products" className="flex w-full items-center">
        <input
          name="q"
          value={query}
          onChange={(event) => setQuery(event.target.value)}
          onFocus={() => {
            if (query.trim().length >= 2) setOpen(true);
          }}
          onKeyDown={(event) => {
            if (event.key === "Escape") setOpen(false);
          }}
          placeholder="جستجو ..."
          autoComplete="off"
          role="combobox"
          aria-expanded={open}
          aria-controls={listId}
          className="w-full min-w-0 flex-1 bg-transparent py-2.5 text-sm outline-none placeholder:text-zinc-400"
        />
        <button type="submit" aria-label="جستجو" className="text-zinc-500 hover:text-brand">
          <IconSearch />
        </button>
      </form>

      {open && (
        <div
          id={listId}
          className="absolute top-[calc(100%+8px)] right-0 left-0 z-50 overflow-hidden rounded-2xl border border-black/8 bg-white shadow-xl"
        >
          {loading && !items.length ? (
            <p className="px-4 py-3 text-sm text-zinc-400">در حال جستجو...</p>
          ) : items.length ? (
            <ul>
              {items.map((product) => {
                const unavailable = product.stock === 0 || product.price === 0;
                return (
                  <li key={product.id}>
                    <Link
                      href={product.href || `/products?q=${encodeURIComponent(query)}`}
                      onClick={onNavigate}
                      className="flex items-center gap-3 px-3 py-2.5 hover:bg-zinc-50"
                    >
                      <Media src={product.image} alt={product.name} className="size-12 shrink-0 rounded-lg" sizes="48px" />
                      <div className="min-w-0 flex-1">
                        <p className="truncate text-[13px] leading-6">{product.name}</p>
                        {unavailable ? (
                          <p className="text-xs text-zinc-400">ناموجود</p>
                        ) : (
                          <p className="text-xs text-zinc-500">
                            {formatPrice(product.price)} <span>تومان</span>
                          </p>
                        )}
                      </div>
                    </Link>
                  </li>
                );
              })}
            </ul>
          ) : (
            <p className="px-4 py-3 text-sm text-zinc-400">نتیجه‌ای پیدا نشد.</p>
          )}
          <Link
            href={`/products?q=${encodeURIComponent(query.trim())}`}
            onClick={onNavigate}
            className="block border-t border-black/5 px-4 py-2.5 text-center text-sm text-brand"
          >
            مشاهده همه نتایج
          </Link>
        </div>
      )}
    </div>
  );
}