"use client";

import { useEffect, useState } from "react";
import { createPortal } from "react-dom";

function ChevronIcon({ direction, className }: { direction: "prev" | "next"; className?: string }) {
  const d = direction === "prev" ? "M14.5 6.5 9 12l5.5 5.5" : "M9.5 6.5 15 12l-5.5 5.5";
  return (
    <svg viewBox="0 0 24 24" fill="none" className={className} aria-hidden>
      <path d={d} stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  );
}

function CloseIcon({ className }: { className?: string }) {
  return (
    <svg viewBox="0 0 24 24" fill="none" className={className} aria-hidden>
      <path d="M6 6l12 12M18 6 6 18" stroke="currentColor" strokeWidth="2" strokeLinecap="round" />
    </svg>
  );
}

function Lightbox({
  images,
  alt,
  index,
  onIndexChange,
  onClose,
}: {
  images: string[];
  alt: string;
  index: number;
  onIndexChange: (i: number) => void;
  onClose: () => void;
}) {
  const hasMultiple = images.length > 1;

  useEffect(() => {
    document.body.style.overflow = "hidden";
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Escape") onClose();
      if (event.key === "ArrowLeft") onIndexChange((index + 1) % images.length);
      if (event.key === "ArrowRight") onIndexChange((index - 1 + images.length) % images.length);
    };
    document.addEventListener("keydown", onKeyDown);
    return () => {
      document.body.style.overflow = "";
      document.removeEventListener("keydown", onKeyDown);
    };
  }, [index, images.length, onClose, onIndexChange]);

  return createPortal(
    <div className="fixed inset-0 z-[120] flex flex-col bg-black/95" onClick={onClose}>
      <button
        type="button"
        onClick={onClose}
        aria-label="بستن"
        className="absolute top-4 left-4 z-10 flex h-10 w-10 items-center justify-center rounded-full bg-white/10 text-white transition-colors hover:bg-white/20"
      >
        <CloseIcon className="h-6 w-6" />
      </button>

      <div className="relative flex flex-1 items-center justify-center p-6" onClick={(e) => e.stopPropagation()}>
        {/* eslint-disable-next-line @next/next/no-img-element */}
        <img src={images[index]} alt={alt} className="max-h-full max-w-full object-contain" />

        {hasMultiple && (
          <>
            <button
              type="button"
              onClick={() => onIndexChange((index - 1 + images.length) % images.length)}
              aria-label="تصویر بعدی"
              className="absolute top-1/2 right-4 flex h-11 w-11 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition-colors hover:bg-white/20"
            >
              <ChevronIcon direction="next" className="h-6 w-6" />
            </button>
            <button
              type="button"
              onClick={() => onIndexChange((index + 1) % images.length)}
              aria-label="تصویر قبلی"
              className="absolute top-1/2 left-4 flex h-11 w-11 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition-colors hover:bg-white/20"
            >
              <ChevronIcon direction="prev" className="h-6 w-6" />
            </button>
          </>
        )}
      </div>

      {hasMultiple && (
        <div
          className="flex justify-center gap-2 overflow-x-auto p-4"
          onClick={(e) => e.stopPropagation()}
        >
          {images.map((img, i) => (
            <button
              key={img + i}
              type="button"
              onClick={() => onIndexChange(i)}
              className={`h-14 w-14 shrink-0 overflow-hidden rounded-lg border-2 transition-colors ${
                i === index ? "border-red" : "border-white/20"
              }`}
            >
              {/* eslint-disable-next-line @next/next/no-img-element */}
              <img src={img} alt="" className="h-full w-full object-cover" />
            </button>
          ))}
        </div>
      )}
    </div>,
    document.body,
  );
}

export function ProductGallery({ images, alt }: { images: string[]; alt: string }) {
  const [index, setIndex] = useState(0);
  const [zoomed, setZoomed] = useState(false);
  const [origin, setOrigin] = useState({ x: 50, y: 50 });
  const [lightboxOpen, setLightboxOpen] = useState(false);

  const list = images.length > 0 ? images : ["/images/placeholder.svg"];
  const hasMultiple = list.length > 1;

  const go = (delta: number) => {
    setIndex((prev) => (prev + delta + list.length) % list.length);
  };

  return (
    <div className="grid gap-3">
      <div
        className="relative aspect-square w-full overflow-hidden rounded-2xl border border-border bg-surface"
        onMouseMove={(event) => {
          const rect = event.currentTarget.getBoundingClientRect();
          setOrigin({
            x: ((event.clientX - rect.left) / rect.width) * 100,
            y: ((event.clientY - rect.top) / rect.height) * 100,
          });
        }}
        onMouseEnter={() => setZoomed(true)}
        onMouseLeave={() => setZoomed(false)}
      >
        {/* eslint-disable-next-line @next/next/no-img-element */}
        <img
          src={list[index]}
          alt={alt}
          onClick={() => setLightboxOpen(true)}
          className="h-full w-full object-contain transition-transform duration-200 ease-out"
          style={{
            transform: zoomed ? "scale(2)" : "scale(1)",
            transformOrigin: `${origin.x}% ${origin.y}%`,
            cursor: zoomed ? "zoom-in" : "zoom-in",
          }}
        />

        {hasMultiple && (
          <>
            <button
              type="button"
              onClick={() => go(-1)}
              aria-label="تصویر بعدی"
              className="absolute top-1/2 right-3 z-10 flex h-9 w-9 -translate-y-1/2 items-center justify-center rounded-full border border-border bg-surface/90 text-foreground shadow-sm transition-colors hover:border-red hover:text-red"
            >
              <ChevronIcon direction="next" className="h-5 w-5" />
            </button>
            <button
              type="button"
              onClick={() => go(1)}
              aria-label="تصویر قبلی"
              className="absolute top-1/2 left-3 z-10 flex h-9 w-9 -translate-y-1/2 items-center justify-center rounded-full border border-border bg-surface/90 text-foreground shadow-sm transition-colors hover:border-red hover:text-red"
            >
              <ChevronIcon direction="prev" className="h-5 w-5" />
            </button>
          </>
        )}
      </div>

      {hasMultiple && (
        <div className="flex flex-wrap gap-3">
          {list.map((img, i) => (
            <button
              key={img + i}
              type="button"
              onClick={() => setIndex(i)}
              aria-label={`تصویر ${i + 1}`}
              className={`h-16 w-16 shrink-0 overflow-hidden rounded-lg border-2 transition-colors ${
                i === index ? "border-red" : "border-border hover:border-red-muted"
              }`}
            >
              {/* eslint-disable-next-line @next/next/no-img-element */}
              <img src={img} alt="" className="h-full w-full object-cover" />
            </button>
          ))}
        </div>
      )}

      {lightboxOpen && (
        <Lightbox
          images={list}
          alt={alt}
          index={index}
          onIndexChange={setIndex}
          onClose={() => setLightboxOpen(false)}
        />
      )}
    </div>
  );
}