"use client";

import { FormEvent, useEffect, useRef, useState } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { Search } from "lucide-react";
import { Placeholder } from "@/components/Placeholder";
import { formatPrice } from "@/lib/format";
import { variantTitle, type StoreVariant } from "@/lib/store";

export function InstantSearch({ compact = false, className = "" }: { compact?: boolean; className?: string }) {
  const router = useRouter();
  const [query, setQuery] = useState("");
  const [items, setItems] = useState<StoreVariant[]>([]);
  const [open, setOpen] = useState(false);
  const [loading, setLoading] = useState(false);
  const box = useRef<HTMLDivElement>(null);

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

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

    const timer = setTimeout(async () => {
      setLoading(true);
      try {
        const response = await fetch(`/api/search?q=${encodeURIComponent(value)}`);
        const data = (await response.json()) as { items?: StoreVariant[] };
        setItems(data.items ?? []);
        setOpen(true);
      } catch {
        setItems([]);
      } finally {
        setLoading(false);
      }
    }, 250);

    return () => clearTimeout(timer);
  }, [query]);

  const goToProducts = (event?: FormEvent) => {
    event?.preventDefault();
    const value = query.trim();
    if (value.length <= 2) return;
    setOpen(false);
    router.push(`/products?q=${encodeURIComponent(value)}`);
  };

  return (
    <div ref={box} className={`relative ${className || (compact ? "w-full" : "hidden min-w-0 flex-1 md:block")}`}>
      <form onSubmit={goToProducts}>
        <input
          type="search"
          value={query}
          onChange={(event) => setQuery(event.target.value)}
          onFocus={() => {
            if (query.trim().length > 2) setOpen(true);
          }}
          placeholder={compact ? "جستجوی محصول..." : "جستجوی محصول و قطعه..."}
          className="h-11 w-full rounded-xl bg-paper pe-4 ps-10 text-[13px] outline-none placeholder:text-muted/70 focus:bg-white focus:ring-1 focus:ring-brand"
        />
        <Search className="pointer-events-none absolute top-1/2 right-3 size-4 -translate-y-1/2 text-muted" />
      </form>

      {open ? (
        <div className="absolute inset-x-0 top-[calc(100%+8px)] z-50 overflow-hidden rounded-2xl border border-line bg-white shadow-[0_16px_40px_rgba(0,0,0,0.1)]">
          {loading ? (
            <p className="px-4 py-3 text-[13px] text-muted">در حال جستجو...</p>
          ) : items.length === 0 ? (
            <p className="px-4 py-3 text-[13px] text-muted">نتیجه‌ای پیدا نشد.</p>
          ) : (
            <>
              <ul className="max-h-[360px] overflow-y-auto py-2">
                {items.map((item) => {
                  const price = item.discountedPrice ?? item.price;
                  return (
                    <li key={item.id}>
                      <Link
                        href={`/products/${encodeURIComponent(item.id)}`}
                        className="flex items-center gap-3 px-3 py-2 hover:bg-paper"
                        onClick={() => setOpen(false)}
                      >
                        <span className="grid size-12 shrink-0 overflow-hidden rounded-lg bg-paper">
                          <Placeholder
                            src={item.productImage || "/placeholders/product.svg"}
                            className="size-full object-contain"
                          />
                        </span>
                        <span className="min-w-0 flex-1">
                          <span className="line-clamp-1 text-[13px] text-ink">{variantTitle(item)}</span>
                          <span className="mt-0.5 block text-[12px] text-muted">
                            {price != null ? `${formatPrice(price)} تومان` : "تماس بگیرید"}
                          </span>
                        </span>
                      </Link>
                    </li>
                  );
                })}
              </ul>
              <button
                type="button"
                onClick={() => goToProducts()}
                className="block w-full border-t border-line px-4 py-3 text-center text-[13px] font-medium text-brand hover:bg-paper"
              >
                مشاهده همه نتایج در محصولات
              </button>
            </>
          )}
        </div>
      ) : null}
    </div>
  );
}