'use client';

import { ImageMeta } from '@/interfaces/image';
import styles from '@/styles/Gallery.module.scss';
import Image from 'next/image';
import { useCallback, useEffect, useState } from 'react';

interface GalleryProps {
  initialImages: ImageMeta[];
}

const HORIZONTAL_ASPECT_RATIO = 1.8;
const VERTICAL_ASPECT_RATIO = 0.8;

export default function Gallery({
  initialImages,
}: GalleryProps) {
  const [fullScreenImageId, setFullScreenImageIdState] = useState<
    string | null
  >(null);

  const setFullScreenImage = useCallback((imageId: string | null) => {
    setFullScreenImageIdState(imageId);

    const url = new URL(window.location.href);

    if (imageId) {
      url.searchParams.set('image', imageId);
    } else {
      url.searchParams.delete('image');
    }

    window.history.replaceState(
      window.history.state,
      '',
      `${url.pathname}${url.search}${url.hash}`,
    );
  }, []);

  useEffect(() => {
    const synchronizeWithUrl = () => {
      const params = new URLSearchParams(window.location.search);
      setFullScreenImageIdState(params.get('image'));
    };

    synchronizeWithUrl();

    window.addEventListener('popstate', synchronizeWithUrl);

    return () => {
      window.removeEventListener('popstate', synchronizeWithUrl);
    };
  }, []);

  useEffect(() => {
    if (!fullScreenImageId) {
      return;
    }

    const previousOverflow = document.body.style.overflow;

    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') {
        setFullScreenImage(null);
      }
    };

    document.body.style.overflow = 'hidden';
    window.addEventListener('keydown', handleKeyDown);

    return () => {
      document.body.style.overflow = previousOverflow;
      window.removeEventListener('keydown', handleKeyDown);
    };
  }, [fullScreenImageId, setFullScreenImage]);

  const currentImageIndex = fullScreenImageId
    ? initialImages.findIndex(
        (image) => image.id === fullScreenImageId,
      )
    : -1;

  const previousImage =
    currentImageIndex > 0
      ? initialImages[currentImageIndex - 1]
      : null;

  const nextImage =
    currentImageIndex >= 0 &&
    currentImageIndex < initialImages.length - 1
      ? initialImages[currentImageIndex + 1]
      : null;

  return (
    <div className={styles.gallery}>
      <div className={styles.images}>
        {initialImages.map((image) => {
          const isHorizontal =
            image.aspect_ratio > HORIZONTAL_ASPECT_RATIO;

          const isVertical =
            image.aspect_ratio < VERTICAL_ASPECT_RATIO;

          return (
            <div
              key={image.id}
              className={`${styles.imagesContainer} ${
                isHorizontal
                  ? styles.horizontal
                  : isVertical
                    ? styles.vertical
                    : ''
              }`}
            >
              <Image
                src={`/api/images/${image.id}`}
                alt={`Gallery image ${image.id}`}
                width={isHorizontal ? image.width : 700}
                height={isVertical ? image.height : 700}
                loading="lazy"
                onClick={() => setFullScreenImage(image.id)}
              />
            </div>
          );
        })}
      </div>

      {fullScreenImageId && (
        <div
          className={styles.fullscreenModal}
          role="dialog"
          aria-modal="true"
          aria-label="Fullscreen image"
          onClick={() => setFullScreenImage(null)}
        >
          <Image
            src={`/api/images/${fullScreenImageId}`}
            alt="Fullscreen gallery image"
            width={1920}
            height={1080}
            style={{ objectFit: 'contain' }}
            onClick={(event) => event.stopPropagation()}
          />

          <button
            type="button"
            className={styles.closeButton}
            aria-label="Close fullscreen image"
            onClick={(event) => {
              event.stopPropagation();
              setFullScreenImage(null);
            }}
          >
            &times;
          </button>

          {previousImage && (
            <button
              type="button"
              className={`${styles.arrowButton} ${styles.arrowButtonLeft}`}
              aria-label="Previous image"
              onClick={(event) => {
                event.stopPropagation();
                setFullScreenImage(previousImage.id);
              }}
            >
              &#8249;
            </button>
          )}

          {nextImage && (
            <button
              type="button"
              className={`${styles.arrowButton} ${styles.arrowButtonRight}`}
              aria-label="Next image"
              onClick={(event) => {
                event.stopPropagation();
                setFullScreenImage(nextImage.id);
              }}
            >
              &#8250;
            </button>
          )}
        </div>
      )}
    </div>
  );
}