import { useState, useCallback, useEffect } from 'react';
import useEmblaCarousel from 'embla-carousel-react';
import { ChevronLeft, ChevronRight } from 'lucide-react';
import type { ListingDetailPhoto } from '@/types';

interface PhotoCarouselProps {
  photos: ListingDetailPhoto[];
}

export function PhotoCarousel({ photos }: PhotoCarouselProps) {
  const [emblaRef, emblaApi] = useEmblaCarousel({ loop: true });
  const [selectedIndex, setSelectedIndex] = useState(0);

  const onSelect = useCallback(() => {
    if (!emblaApi) return;
    setSelectedIndex(emblaApi.selectedScrollSnap());
  }, [emblaApi]);

  useEffect(() => {
    if (!emblaApi) return;
    emblaApi.on('select', onSelect);
    return () => { emblaApi.off('select', onSelect); };
  }, [emblaApi, onSelect]);

  if (photos.length === 0) {
    return (
      <div className="w-full h-48 bg-muted flex items-center justify-center text-muted-foreground">
        No photos available
      </div>
    );
  }

  return (
    <div className="relative">
      <div className="overflow-hidden" ref={emblaRef}>
        <div className="flex">
          {photos.map((photo, i) => (
            <div key={i} className="flex-[0_0_100%] min-w-0">
              <img
                src={photo.url}
                alt={photo.caption || `Photo ${i + 1}`}
                className="w-full h-64 object-cover"
                loading="lazy"
              />
            </div>
          ))}
        </div>
      </div>
      {/* Prev/Next arrows */}
      {photos.length > 1 && (
        <>
          <button
            className="absolute left-1 top-1/2 -translate-y-1/2 bg-black/50 hover:bg-black/70 text-white rounded-full p-1 transition-colors"
            onClick={() => emblaApi?.scrollPrev()}
            aria-label="Previous photo"
          >
            <ChevronLeft className="w-5 h-5" />
          </button>
          <button
            className="absolute right-1 top-1/2 -translate-y-1/2 bg-black/50 hover:bg-black/70 text-white rounded-full p-1 transition-colors"
            onClick={() => emblaApi?.scrollNext()}
            aria-label="Next photo"
          >
            <ChevronRight className="w-5 h-5" />
          </button>
        </>
      )}
      {/* Counter */}
      <div className="absolute bottom-2 right-2 bg-black/60 text-white text-xs px-2 py-1 rounded">
        {selectedIndex + 1} / {photos.length}
      </div>
      {/* Dots */}
      {photos.length > 1 && photos.length <= 20 && (
        <div className="flex justify-center gap-1 mt-2">
          {photos.map((_, i) => (
            <button
              key={i}
              className={`w-1.5 h-1.5 rounded-full transition-colors ${
                i === selectedIndex ? 'bg-primary' : 'bg-muted-foreground/30'
              }`}
              onClick={() => emblaApi?.scrollTo(i)}
            />
          ))}
        </div>
      )}
    </div>
  );
}