'use client';

import { useState, useEffect } from 'react';
import { useIntersectionObserver } from '@/hooks/useIntersectionObserver';
import { useImageDownloadTime } from '@/components/shared/ImageCard/useImageDownloadTime';
import { ImageMetadataBar } from '@/components/shared/ImageMetadataBar';
import { calculateAspectRatio } from '@/utils/imageUtils';
import { usePageContext } from '@/contexts/page-context';
import { ExpandedImageView } from '@/components/shared/ExpandedImageView';

type GalleryImageCardProps = {
  imageUrl: string;
  filename: string;
  size: number;
  contentType: string;
  lastModified: string;
  onDownloadMeasured: (imageId: string, downloadMs: number) => void;
};

export const GalleryImageCard = ({
  imageUrl,
  filename,
  size,
  contentType,
  lastModified,
  onDownloadMeasured,
}: GalleryImageCardProps) => {
  const { openModal } = usePageContext();
  const [isVisible, setIsVisible] = useState(false);
  const [imageDimensions, setImageDimensions] = useState<{
    width: number;
    height: number;
  } | null>(null);

  const { ref } = useIntersectionObserver({
    onIntersect: () => setIsVisible(true),
    threshold: 0.1,
  });

  const { downloadTime } = useImageDownloadTime(isVisible ? imageUrl : null);

  useEffect(() => {
    if (downloadTime !== null) {
      onDownloadMeasured(imageUrl, downloadTime);
    }
  }, [downloadTime, imageUrl, onDownloadMeasured]);

  useEffect(() => {
    if (!isVisible) return;

    const img = new Image();
    img.onload = () => {
      setImageDimensions({
        width: img.width,
        height: img.height,
      });
    };
    img.src = imageUrl;
  }, [isVisible, imageUrl]);

  const handleImageClick = () => {
    openModal(<ExpandedImageView imageUrl={imageUrl} alt={filename} />);
  };

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter' || e.key === ' ') {
      e.preventDefault();
      handleImageClick();
    }
  };

  const formatTimestamp = (dateString: string): string => {
    const date = new Date(dateString);
    return date.toLocaleString('en-US', {
      month: 'short',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
    });
  };

  return (
    <div
      ref={ref}
      className="p-4 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-xl hover:border-slate-600 transition-all h-full"
    >
      <div
        className="aspect-video bg-slate-800 rounded-lg mb-3 overflow-hidden cursor-pointer group relative focus:outline-none focus:ring-2 focus:ring-amber-500"
        onClick={handleImageClick}
        role="button"
        tabIndex={0}
        aria-label={`View full size image: ${filename}`}
        onKeyDown={handleKeyDown}
      >
        {isVisible ? (
          <>
            <img
              src={imageUrl}
              alt={filename}
              className="w-full h-full object-cover transition-transform group-hover:scale-105"
            />

            <div className="absolute inset-0 bg-gradient-to-b from-black/70 via-transparent to-black/70 opacity-0 group-hover:opacity-100 group-focus:opacity-100 transition-opacity">
              <div className="absolute top-3 left-3">
                <span className="px-3 py-2 bg-black/50 backdrop-blur-sm text-white text-xs sm:text-sm font-medium rounded border border-white/10" aria-label={`Created ${formatTimestamp(lastModified)}`}>
                  {formatTimestamp(lastModified)}
                </span>
              </div>

              <div className="absolute top-3 right-3 max-w-[60%]">
                <span
                  className="px-3 py-2 bg-black/50 backdrop-blur-sm text-white text-xs sm:text-sm font-medium rounded border border-white/10 truncate block"
                  title={filename}
                  aria-label={`Filename: ${filename}`}
                >
                  {filename}
                </span>
              </div>

              <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
                <div className="bg-black/60 backdrop-blur-sm rounded-full p-4">
                  <svg
                    className="w-10 h-10 sm:w-12 sm:h-12 text-white"
                    fill="none"
                    viewBox="0 0 24 24"
                    stroke="currentColor"
                    aria-hidden="true"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={2}
                      d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM10 7v3m0 0v3m0-3h3m-3 0H7"
                    />
                  </svg>
                </div>
              </div>
            </div>
          </>
        ) : (
          <div className="w-full h-full flex items-center justify-center bg-slate-800 animate-pulse" aria-label="Loading image">
            <div className="text-gray-600">
              <svg
                className="w-12 h-12"
                fill="none"
                viewBox="0 0 24 24"
                stroke="currentColor"
                aria-hidden="true"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z"
                />
              </svg>
            </div>
          </div>
        )}
      </div>

      {imageDimensions && (
        <ImageMetadataBar
          width={imageDimensions.width}
          height={imageDimensions.height}
          fileSize={size}
          fileType={contentType}
          showVisualIndicator={true}
          downloadMs={downloadTime}
        />
      )}
    </div>
  );
};