import React, { useRef, useState, useEffect } from "react";
import { ContentItem } from "../lib/types";
import { useNavigate } from "react-router-dom";
import { ChevronLeft, ChevronRight, Star } from "lucide-react";
import { cn } from "@/lib/utils";
import { useIsMobile } from "@/hooks/use-mobile";
import { useMyList } from "@/hooks/use-my-list";
import { supabase } from "@/integrations/supabase/client";
import { useUrdf } from "@/hooks/useUrdf";

interface CarouselProps {
  title: string;
  items: ContentItem[];
  className?: string;
}

const Carousel: React.FC<CarouselProps> = ({ title, items, className }) => {
  const carouselRef = useRef<HTMLDivElement>(null);
  const navigate = useNavigate();
  const isMobile = useIsMobile();
  const { myList, addToMyList, removeFromMyList, isInMyList } = useMyList();
  const [imageUrls, setImageUrls] = useState<Record<string, string>>({});
  const { urdfProcessor, processUrdfFiles } = useUrdf();

  // Fetch image URLs for all items
  useEffect(() => {
    const fetchImages = async () => {
      const urls: Record<string, string> = {};

      for (const item of items) {
        if (
          item.imageUrl &&
          !item.imageUrl.startsWith("http") &&
          !item.imageUrl.startsWith("data:")
        ) {
          try {
            // Get public URL for the image
            const { data, error } = await supabase.storage
              .from("urdf-images")
              .createSignedUrl(item.imageUrl, 3600); // 1 hour expiry

            if (data && !error) {
              urls[item.id] = data.signedUrl;
            } else {
              // Fallback to placeholder
              urls[item.id] = "/placeholder.svg";
            }
          } catch (error) {
            console.error(`Error fetching image for ${item.id}:`, error);
            urls[item.id] = "/placeholder.svg";
          }
        } else {
          // For URLs that are already full URLs or data URIs
          urls[item.id] = item.imageUrl || "/placeholder.svg";
        }
      }

      setImageUrls(urls);
    };

    if (items.length > 0) {
      fetchImages();
    }
  }, [items]);

  const handleScrollLeft = () => {
    if (carouselRef.current) {
      const scrollAmount = carouselRef.current.offsetWidth / 4.1;
      carouselRef.current.scrollBy({ left: -scrollAmount, behavior: "smooth" });
    }
  };

  const handleScrollRight = () => {
    if (carouselRef.current) {
      const scrollAmount = carouselRef.current.offsetWidth / 4.1;
      carouselRef.current.scrollBy({ left: scrollAmount, behavior: "smooth" });
    }
  };

  const handleItemClick = async (item: ContentItem) => {
    // Only navigate to the content detail page, let the detail page handle loading
    navigate(`/content/${item.id}`);

    // We've removed the URDF loading here to prevent duplication with ContentDetail's loading
  };

  const handleStarClick = (e: React.MouseEvent, item: ContentItem) => {
    e.stopPropagation(); // Prevent navigation on star click

    if (isInMyList(item.id)) {
      removeFromMyList(item.id);
    } else {
      addToMyList(item);
    }
  };

  // If no items, don't render the carousel
  if (items.length === 0) return null;

  return (
    <div className={cn("my-5", className)}>
      <div className="relative group">
        <div
          ref={carouselRef}
          className="carousel-container flex items-center gap-2 overflow-x-auto py-2 px-4 scroll-smooth"
        >
          {items.map((item) => (
            <div
              key={item.id}
              className="carousel-item flex-shrink-0 cursor-pointer relative hover:z-10"
              style={{
                width: "calc(100% / 4.1)",
              }}
              onClick={() => handleItemClick(item)}
            >
              <div className="relative rounded-md w-full h-full group/item">
                {/* Image container with darker overlay on hover */}
                <div className="rounded-md overflow-hidden w-full h-full bg-black">
                  <img
                    src={imageUrls[item.id] || "/placeholder.svg"}
                    alt={item.title}
                    className="w-full h-full object-cover rounded-md transition-all duration-300 group-hover/item:brightness-90"
                    style={{
                      aspectRatio: "0.8",
                    }}
                  />
                </div>
                {/* Star button */}
                <div
                  className="absolute top-4 right-4 p-2 z-20 invisible group-hover/item:visible"
                  onClick={(e) => handleStarClick(e, item)}
                >
                  <Star
                    size={24}
                    className={cn(
                      "transition-colors duration-300",
                      isInMyList(item.id)
                        ? "fill-yellow-400 text-yellow-400"
                        : "text-white hover:text-yellow-400"
                    )}
                  />
                </div>
                {/* Title overlay - visible on hover without gradient */}
                <div className="absolute bottom-4 left-4 opacity-0 group-hover/item:opacity-100 transition-opacity duration-300">
                  <h3 className="text-gray-400 text-6xl font-bold drop-shadow-xl">
                    {item.title}
                  </h3>
                </div>
              </div>
            </div>
          ))}
        </div>

        {/* Scroll buttons - changed to always visible */}
        <button
          onClick={handleScrollLeft}
          className="absolute left-0 top-1/2 -translate-y-1/2 bg-black text-white p-1 rounded-full z-40"
          aria-label="Scroll left"
        >
          <ChevronLeft size={24} />
        </button>

        <button
          onClick={handleScrollRight}
          className="absolute right-0 top-1/2 -translate-y-1/2 bg-black text-white p-1 rounded-full z-40"
          aria-label="Scroll right"
        >
          <ChevronRight size={24} />
        </button>
      </div>
    </div>
  );
};

export default Carousel;