import * as React from "react";
import useEmblaCarousel from "embla-carousel-react";
import { ArrowLeft, ArrowRight } from "lucide-react";

import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";

const CarouselContext = React.createContext(null);

function useCarousel() {
  const context = React.useContext(CarouselContext);

  if (!context) {
    throw new Error("useCarousel must be used within a <Case1 />");
  }

  return context;
}

const Carousel = React.forwardRef(
  (
    {
      orientation = "horizontal",
      opts,
      setApi,
      plugins,
      className,
      children,
      ...props
    },
    ref
  ) => {
    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((api) => {
      if (!api) {
        return;
      }

      setCanScrollPrev(api.canScrollPrev());
      setCanScrollNext(api.canScrollNext());
    }, []);

    const scrollPrev = React.useCallback(() => {
      api?.scrollPrev();
    }, [api]);

    const scrollNext = React.useCallback(() => {
      api?.scrollNext();
    }, [api]);

    const handleKeyDown = React.useCallback(
      (event) => {
        if (event.key === "ArrowLeft") {
          event.preventDefault();
          scrollPrev();
        } else if (event.key === "ArrowRight") {
          event.preventDefault();
          scrollNext();
        }
      },
      [scrollPrev, scrollNext]
    );

    React.useEffect(() => {
      if (!api || !setApi) {
        return;
      }

      setApi(api);
    }, [api, setApi]);

    React.useEffect(() => {
      if (!api) {
        return;
      }

      onSelect(api);
      api.on("reInit", onSelect);
      api.on("select", onSelect);

      return () => {
        api?.off("select", onSelect);
      };
    }, [api, onSelect]);

    return (
      <CarouselContext.Provider
        value={{
          carouselRef,
          api: api,
          opts,
          orientation:
            orientation || (opts?.axis === "y" ? "vertical" : "horizontal"),
          scrollPrev,
          scrollNext,
          canScrollPrev,
          canScrollNext,
        }}
      >
        <div
          ref={ref}
          onKeyDownCapture={handleKeyDown}
          className={cn("relative", className)}
          role="region"
          aria-roledescription="carousel"
          {...props}
        >
          {children}
        </div>
      </CarouselContext.Provider>
    );
  }
);
Carousel.displayName = "Carousel";

const CarouselContent = React.forwardRef(({ className, ...props }, ref) => {
  const { carouselRef, orientation } = useCarousel();

  return (
    <div ref={carouselRef} className="overflow-hidden">
      <div
        ref={ref}
        className={cn(
          "flex",
          orientation === "horizontal" ? "-ml-4" : "-mt-4 flex-col",
          className
        )}
        {...props}
      />
    </div>
  );
});
CarouselContent.displayName = "CarouselContent";

const CarouselItem = React.forwardRef(({ className, ...props }, ref) => {
  const { orientation } = useCarousel();

  return (
    <div
      ref={ref}
      role="group"
      aria-roledescription="slide"
      className={cn(
        "min-w-0 shrink-0 grow-0 basis-full",
        orientation === "horizontal" ? "pl-4" : "pt-4",
        className
      )}
      {...props}
    />
  );
});
CarouselItem.displayName = "CarouselItem";

const CarouselPrevious = React.forwardRef(
  ({ className, variant = "outline", size = "icon", ...props }, ref) => {
    const { orientation, scrollPrev, canScrollPrev } = useCarousel();

    return (
      <Button
        ref={ref}
        variant={variant}
        size={size}
        className={cn(
          "absolute  h-8 w-8 rounded-full",
          orientation === "horizontal"
            ? "-left-12 top-1/2 -translate-y-1/2"
            : "-top-12 left-1/2 -translate-x-1/2 rotate-90",
          className
        )}
        disabled={!canScrollPrev}
        onClick={scrollPrev}
        {...props}
      >
        <ArrowLeft className="h-4 w-4" />
        <span className="sr-only">Previous slide</span>
      </Button>
    );
  }
);
CarouselPrevious.displayName = "CarouselPrevious";

const CarouselNext = React.forwardRef(
  ({ className, variant = "outline", size = "icon", ...props }, ref) => {
    const { orientation, scrollNext, canScrollNext } = useCarousel();

    return (
      <Button
        ref={ref}
        variant={variant}
        size={size}
        className={cn(
          "absolute h-8 w-8 rounded-full",
          orientation === "horizontal"
            ? "-right-12 top-1/2 -translate-y-1/2"
            : "-bottom-12 left-1/2 -translate-x-1/2 rotate-90",
          className
        )}
        disabled={!canScrollNext}
        onClick={scrollNext}
        {...props}
      >
        <ArrowRight className="h-4 w-4" />
        <span className="sr-only">Next slide</span>
      </Button>
    );
  }
);
CarouselNext.displayName = "CarouselNext";

const CarouselDots = React.forwardRef((props, ref) => {
  const { api } = useCarousel();
  const [updateState, setUpdateState] = React.useState(false);
  const toggleUpdateState = React.useCallback(
    () => setUpdateState((prevState) => !prevState),
    []
  );

  React.useEffect(() => {
    if (api) {
      api.on("select", toggleUpdateState);
      api.on("reInit", toggleUpdateState);

      return () => {
        api.off("select", toggleUpdateState);
        api.off("reInit", toggleUpdateState);
      };
    }
  }, [api, toggleUpdateState]);

  const numberOfSlides = api?.scrollSnapList().length || 0;
  const currentSlide = api?.selectedScrollSnap() || 0;

  if (numberOfSlides > 1) {
    return (
      <div ref={ref} className={`flex justify-center ${props.className}`}>
        {Array.from({ length: numberOfSlides }, (_, i) => (
          <Button
            key={i}
            className={`mx-1 h-1.5 w-1.5 rounded-full p-0 ${
              i === currentSlide
                ? " w-16 h-2.5 bg-white rounded-full transform hover:bg-white"
                : "w-2.5 h-2.5 opacity-60 bg-white rounded-full  hover:bg-white "
            }`}
            aria-label={`Go to slide ${i + 1}`}
            onClick={() => api?.scrollTo(i)}
          />
        ))}
      </div>
    );
  } else {
    return <></>;
  }
});
CarouselDots.displayName = "CarouselDots";

export {
  Carousel,
  CarouselContent,
  CarouselItem,
  CarouselPrevious,
  CarouselNext,
  CarouselDots,
};