'use client';

import * as React from 'react';
import useEmblaCarousel, { type UseEmblaCarouselType } from 'embla-carousel-react';
import { ArrowLeft, ArrowRight } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';

type CarouselApi = UseEmblaCarouselType[1];
type UseCarouselParameters = Parameters<typeof useEmblaCarousel>;
type CarouselOptions = UseCarouselParameters[0];
type CarouselPlugin = UseCarouselParameters[1];

type CarouselContextValue = {
  carouselRef: ReturnType<typeof useEmblaCarousel>[0];
  api: CarouselApi;
  scrollPrev: () => void;
  scrollNext: () => void;
  canScrollPrev: boolean;
  canScrollNext: boolean;
  orientation: 'horizontal' | 'vertical';
};

const CarouselContext = React.createContext<CarouselContextValue | null>(null);

function useCarousel() {
  const context = React.useContext(CarouselContext);
  if (!context) throw new Error('useCarousel must be used within a Carousel');
  return context;
}

function Carousel({ orientation = 'horizontal', opts, setApi, plugins, className, children, ...props }: React.ComponentProps<'div'> & { orientation?: 'horizontal' | 'vertical'; opts?: CarouselOptions; setApi?: (api: CarouselApi) => void; plugins?: CarouselPlugin }) {
  const [carouselRef, api] = useEmblaCarousel({ ...opts, axis: orientation === 'horizontal' ? 'x' : 'y' }, plugins);
  const [canScrollPrev, setCanScrollPrev] = React.useState(false);
  const [canScrollNext, setCanScrollNext] = React.useState(false);

  const onSelect = React.useCallback((carouselApi: CarouselApi) => {
    if (!carouselApi) return;
    setCanScrollPrev(carouselApi.canScrollPrev());
    setCanScrollNext(carouselApi.canScrollNext());
  }, []);
  const scrollPrev = React.useCallback(() => api?.scrollPrev(), [api]);
  const scrollNext = React.useCallback(() => api?.scrollNext(), [api]);

  React.useEffect(() => { if (api && setApi) setApi(api); }, [api, setApi]);
  React.useEffect(() => {
    if (!api) return;
    onSelect(api);
    api.on('reInit', onSelect);
    api.on('select', onSelect);
    return () => { api.off('reInit', onSelect); api.off('select', onSelect); };
  }, [api, onSelect]);

  return (
    <CarouselContext.Provider value={{ carouselRef, api, scrollPrev, scrollNext, canScrollPrev, canScrollNext, orientation }}>
      <div role="region" aria-roledescription="carousel" data-slot="carousel" className={cn('relative', className)} onKeyDownCapture={(event) => { if (event.key === 'ArrowLeft') { event.preventDefault(); scrollPrev(); } else if (event.key === 'ArrowRight') { event.preventDefault(); scrollNext(); } }} {...props}>{children}</div>
    </CarouselContext.Provider>
  );
}

function CarouselContent({ className, ...props }: React.ComponentProps<'div'>) {
  const { carouselRef, orientation } = useCarousel();
  return <div ref={carouselRef} className="overflow-hidden"><div data-slot="carousel-content" className={cn('flex', orientation === 'horizontal' ? '-ml-5' : '-mt-5 flex-col', className)} {...props} /></div>;
}

function CarouselItem({ className, ...props }: React.ComponentProps<'div'>) {
  const { orientation } = useCarousel();
  return <div role="group" aria-roledescription="slide" data-slot="carousel-item" className={cn('min-w-0 shrink-0 grow-0 basis-full', orientation === 'horizontal' ? 'pl-5' : 'pt-5', className)} {...props} />;
}

function CarouselPrevious({ className, ...props }: React.ComponentProps<typeof Button>) {
  const { scrollPrev, canScrollPrev } = useCarousel();
  return <Button data-slot="carousel-previous" variant="outline" size="icon" className={cn('absolute left-0 top-1/2 -translate-y-1/2 rounded-full', className)} disabled={!canScrollPrev} onClick={scrollPrev} {...props}><ArrowLeft aria-hidden="true" /><span className="sr-only">Previous slide</span></Button>;
}

function CarouselNext({ className, ...props }: React.ComponentProps<typeof Button>) {
  const { scrollNext, canScrollNext } = useCarousel();
  return <Button data-slot="carousel-next" variant="outline" size="icon" className={cn('absolute right-0 top-1/2 -translate-y-1/2 rounded-full', className)} disabled={!canScrollNext} onClick={scrollNext} {...props}><ArrowRight aria-hidden="true" /><span className="sr-only">Next slide</span></Button>;
}

export { type CarouselApi, Carousel, CarouselContent, CarouselItem, CarouselPrevious, CarouselNext };