"use client";

import { useEffect, useState, useTransition } from "react";
import Link from "next/link";
import { useRouter, usePathname } from "next/navigation";
import { Minus, Plus } from "lucide-react";
import {
  addToCart,
  updateCartItemQuantity,
  removeCartItem,
} from "@/lib/api/cart";
import type { CartItem, ProductListItem } from "@/types/api";

export function ProductGridCard({
  product,
  cartItem,
}: {
  product: ProductListItem;
  cartItem: CartItem | null;
}) {
  const router = useRouter();
  const pathname = usePathname();
  const [isPending, startTransition] = useTransition();
  const [localItem, setLocalItem] = useState(cartItem);
  const [error, setError] = useState<string | null>(null);

  const quantity = localItem?.quantity ?? 0;
  const disabled = !product.is_active || product.is_out_of_stock;

  useEffect(() => {
    if (!error) return;
    const timeout = setTimeout(() => setError(null), 3000);
    return () => clearTimeout(timeout);
  }, [error]);

  function handleAdd() {
    startTransition(async () => {
      const result = await addToCart(product.uuid, 1);
      if (result.ok) {
        setLocalItem(result.data);
        router.refresh();
      } else if (result.status === 401) {
        router.push(`/login?next=${encodeURIComponent(pathname)}`);
      } else {
        setError(result.message);
      }
    });
  }

  function handleChange(nextQuantity: number) {
    if (!localItem) return;
    startTransition(async () => {
      if (nextQuantity <= 0) {
        const result = await removeCartItem(localItem.uuid);
        if (result.ok) setLocalItem(null);
        else setError(result.message);
      } else {
        const result = await updateCartItemQuantity(
          localItem.uuid,
          nextQuantity,
        );
        if (result.ok) setLocalItem(result.data);
        else setError(result.message);
      }
      router.refresh();
    });
  }

  return (
    <article className="relative flex h-63.5 w-39.25 flex-col overflow-hidden rounded-xl border border-gray-300 bg-white shadow-[0_2px_10px_-6px_rgba(0,0,0,0.039),0_14px_28px_-12px_rgba(0,0,0,0.071)]">
      {error && (
        <div className="absolute inset-x-1 top-1 z-10 rounded-lg bg-error px-2 py-1 text-center text-[11px] leading-tight text-white">
          {error}
        </div>
      )}
      <Link href={`/products/${product.uuid}`} className="block shrink-0">
        <div className="relative h-32.5 w-full overflow-hidden rounded-t-xl bg-muted">
          {product.image_url && (
            // eslint-disable-next-line @next/next/no-img-element
            <img
              src={product.image_url}
              alt={product.name}
              className="h-full w-full object-cover"
            />
          )}
          <div className="absolute inset-x-0 bottom-0 h-1/2 bg-linear-to-t from-black/40 to-transparent" />
        </div>
      </Link>
      <div className="flex flex-1 flex-col gap-1.5 p-3">
        <Link href={`/products/${product.uuid}`}>
          <h3 className="truncate text-right text-[14px] font-bold leading-none text-foreground">
            {product.name}
          </h3>
        </Link>
        <p className="text-right text-body-medium font-extrabold text-primary-action">
          {product.price.toLocaleString("fa-IR")} تومان
        </p>
        {disabled && (
          <span className="mt-auto text-center text-label text-gray-500">
            ناموجود
          </span>
        )}
      </div>

      {!disabled && (
        <div
          className={`motion-reduce:transition-none absolute bottom-3 left-3 overflow-hidden rounded-full border transition-[width,background-color,border-color] duration-300 ease-out ${
            quantity === 0
              ? "h-10 w-10 border-transparent bg-primary-action"
              : "h-10 w-28 border-gray-300 bg-white"
          }`}
          dir="ltr"
        >
          <div className="relative flex h-full w-full items-center justify-between px-1">
            <button
              type="button"
              onClick={
                quantity === 0 ? handleAdd : () => handleChange(quantity + 1)
              }
              disabled={isPending}
              aria-label={quantity === 0 ? "افزودن به سبد" : "افزایش تعداد"}
              className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full border-0 bg-primary-action p-0 text-white disabled:opacity-40"
            >
              <Plus className="h-4 w-4" />
            </button>

            {quantity > 0 && (
              <>
                <span className="flex h-full w-8 shrink-0 items-center justify-center text-center text-[18px] font-bold leading-none text-foreground">
                  {quantity.toLocaleString("fa-IR")}
                </span>

                <button
                  type="button"
                  onClick={() => handleChange(quantity - 1)}
                  disabled={isPending}
                  aria-label="کاهش تعداد"
                  className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full border-0 bg-blue-bg p-0 text-primary-action disabled:opacity-40"
                >
                  <Minus className="h-4 w-4" />
                </button>
              </>
            )}
          </div>
        </div>
      )}
    </article>
  );
}