'use client';

import * as React from 'react';
import { ChevronLeft, ChevronRight, X, ZoomIn } from 'lucide-react';
import { cn } from '@/lib/utils';

interface DocumentFullscreenViewerProps {
  images: { storageKey: string; url: string }[];
  initialIndex?: number;
  open: boolean;
  onOpenChange: (open: boolean) => void;
}

export function DocumentFullscreenViewer({ images, initialIndex = 0, open, onOpenChange }: DocumentFullscreenViewerProps) {
  const [index, setIndex] = React.useState(initialIndex);

  React.useEffect(() => {
    if (open) setIndex(initialIndex);
  }, [initialIndex, open]);

  React.useEffect(() => {
    if (!open) return;
    function onKeyDown(event: KeyboardEvent) {
      if (event.key === 'Escape') onOpenChange(false);
      if (event.key === 'ArrowLeft') setIndex((current) => Math.max(0, current - 1));
      if (event.key === 'ArrowRight') setIndex((current) => Math.min(images.length - 1, current + 1));
    }
    window.addEventListener('keydown', onKeyDown);
    return () => window.removeEventListener('keydown', onKeyDown);
  }, [images.length, onOpenChange, open]);

  if (!open || images.length === 0) return null;

  const current = images[index];

  return (
    <div className="fixed inset-0 z-[300] flex flex-col bg-black/95">
      <div className="flex items-center justify-between px-4 py-3 text-white">
        <span className="text-sm text-white/80">
          {index + 1} / {images.length}
        </span>
        <button type="button" onClick={() => onOpenChange(false)} className="rounded-full p-2 hover:bg-white/10" aria-label="Закрыть">
          <X className="h-5 w-5" />
        </button>
      </div>

      <div className="relative flex flex-1 items-center justify-center px-4 pb-6">
        {images.length > 1 ? (
          <button
            type="button"
            disabled={index === 0}
            onClick={() => setIndex((value) => Math.max(0, value - 1))}
            className="absolute left-4 z-10 rounded-full bg-white/10 p-2 text-white disabled:opacity-30"
            aria-label="Предыдущее фото"
          >
            <ChevronLeft className="h-6 w-6" />
          </button>
        ) : null}

        {/* eslint-disable-next-line @next/next/no-img-element */}
        <img src={current.url} alt="Фото документа" className="max-h-[calc(100vh-120px)] max-w-full object-contain" />

        {images.length > 1 ? (
          <button
            type="button"
            disabled={index === images.length - 1}
            onClick={() => setIndex((value) => Math.min(images.length - 1, value + 1))}
            className="absolute right-4 z-10 rounded-full bg-white/10 p-2 text-white disabled:opacity-30"
            aria-label="Следующее фото"
          >
            <ChevronRight className="h-6 w-6" />
          </button>
        ) : null}
      </div>
    </div>
  );
}

interface DocumentPhotoThumbnailProps {
  url?: string;
  loading?: boolean;
  className?: string;
  onClick?: () => void;
}

export function DocumentPhotoThumbnail({ url, loading, className, onClick }: DocumentPhotoThumbnailProps) {
  return (
    <button
      type="button"
      onClick={onClick}
      className={cn(
        'group relative aspect-[4/3] overflow-hidden rounded-2xl border border-[#eceef4] bg-[#f4f5f8] transition hover:border-[#20212b]',
        className
      )}
    >
      {loading ? <div className="h-full w-full animate-pulse bg-[#eceef4]" /> : null}
      {!loading && url ? (
        <>
          {/* eslint-disable-next-line @next/next/no-img-element */}
          <img src={url} alt="Фото документа" className="h-full w-full object-cover" />
          <div className="absolute inset-0 flex items-center justify-center bg-black/0 transition group-hover:bg-black/20">
            <ZoomIn className="h-6 w-6 text-white opacity-0 transition group-hover:opacity-100" />
          </div>
        </>
      ) : null}
      {!loading && !url ? <div className="flex h-full items-center justify-center text-xs text-[#667085]">Нет превью</div> : null}
    </button>
  );
}