"use client";

import Image from "next/image";
import { ChevronLeft, ChevronRight, Expand, X } from "lucide-react";
import { useEffect, useState, type MouseEvent } from "react";

export function ProductGallery({
  images,
  alt,
}: {
  images: string[];
  alt: string;
}) {
  const [active, setActive] = useState(0);
  const [lightbox, setLightbox] = useState(false);
  const [origin, setOrigin] = useState("50% 50%");

  const previous = () => setActive((value) => (value - 1 + images.length) % images.length);
  const next = () => setActive((value) => (value + 1) % images.length);

  useEffect(() => {
    if (!lightbox) return;
    const onKey = (event: KeyboardEvent) => {
      if (event.key === "Escape") setLightbox(false);
      if (event.key === "ArrowLeft") next();
      if (event.key === "ArrowRight") previous();
    };
    document.body.style.overflow = "hidden";
    window.addEventListener("keydown", onKey);
    return () => {
      document.body.style.overflow = "";
      window.removeEventListener("keydown", onKey);
    };
  }, [lightbox, images.length]);

  function updateZoomOrigin(event: MouseEvent<HTMLButtonElement>) {
    const bounds = event.currentTarget.getBoundingClientRect();
    const x = ((event.clientX - bounds.left) / bounds.width) * 100;
    const y = ((event.clientY - bounds.top) / bounds.height) * 100;
    setOrigin(`${x}% ${y}%`);
  }

  if (images.length === 0) return null;

  return (
    <>
      <div className="product-gallery">
        <button
          className="product-gallery-main"
          type="button"
          onClick={() => setLightbox(true)}
          onMouseMove={updateZoomOrigin}
          onMouseLeave={() => setOrigin("50% 50%")}
          aria-label="نمایش تصویر بزرگ"
        >
          <Image
            src={images[active]}
            alt={`${alt} - تصویر ${active + 1}`}
            fill
            loading="eager"
            sizes="(max-width: 900px) 100vw, 55vw"
            style={{ transformOrigin: origin }}
          />
          <span><Expand /></span>
        </button>

        {images.length > 1 && (
          <div className="gallery-thumbnails">
            {images.map((image, index) => (
              <button
                key={`${image}-${index}`}
                type="button"
                className={index === active ? "active" : ""}
                onClick={() => setActive(index)}
                aria-label={`تصویر ${index + 1}`}
              >
                <Image
                  src={image}
                  alt={`${alt} - تصویر کوچک ${index + 1}`}
                  fill
                  sizes="90px"
                />
              </button>
            ))}
          </div>
        )}
      </div>

      {lightbox && (
        <div className="lightbox" role="dialog" aria-modal="true" aria-label={`گالری ${alt}`}>
          <button className="lightbox-close" type="button" onClick={() => setLightbox(false)} aria-label="بستن">
            <X />
          </button>
          {images.length > 1 && (
            <>
              <button className="lightbox-prev" type="button" onClick={previous} aria-label="تصویر قبلی">
                <ChevronRight />
              </button>
              <button className="lightbox-next" type="button" onClick={next} aria-label="تصویر بعدی">
                <ChevronLeft />
              </button>
            </>
          )}
          <div className="lightbox-image">
            <Image src={images[active]} alt={`${alt} - تصویر بزرگ`} fill sizes="100vw" />
          </div>
          <span className="lightbox-count">{active + 1} / {images.length}</span>
        </div>
      )}
    </>
  );
}