import * as React from "react";
import Autoplay from "embla-carousel-autoplay";

import { Card, CardContent } from "@/ui/card";
import {
  Carousel,
  CarouselContent,
  CarouselItem,
  CarouselNext,
  CarouselPrevious,
  type CarouselApi,
} from "@/ui/carousel";

const imageUrls = [
  "/images/carousel-1.jpg",
  "/images/carousel-2.jpg",
  "/images/carousel-3.jpg",
  "/images/carousel-4.jpg",
  "/images/carousel-5.jpg",
  "/images/carousel-6.jpg",
];

export interface CarouselDemoProps {
  paginationPosition?: 'left' | 'right'; // 默认右下角
  paginationStyle?: 'dot' | 'bar';       // 默认圆形
}

export function CarouselDemo({
  paginationPosition = 'right',
  paginationStyle = 'dot',
}: CarouselDemoProps) {
  const [api, setApi] = React.useState<CarouselApi>();
  const [current, setCurrent] = React.useState(0);
  const [count, setCount] = React.useState(0);
  const totalSlides = imageUrls.length;

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

    setCount(api.scrollSnapList().length);
    setCurrent(api.selectedScrollSnap());

    api.on("select", () => {
      setCurrent(api.selectedScrollSnap());
    });
  }, [api]);

  return (
    <div className="relative w-full h-full">
      <Carousel
        opts={{ loop: true }}
        plugins={[
          Autoplay({
            delay: 3000,
            stopOnInteraction: false,
          }),
        ]}
        setApi={setApi}
        className="w-full h-full"
      >
        <CarouselContent className="h-full w-full -ml-0">
          {imageUrls.map((src, index) => (
            <CarouselItem key={index} className="w-full h-full pl-0">
              <div className="p-0 w-full h-full">
                <CardContent className="flex items-center justify-center p-0 w-full h-full m-0">
                  <img
                    src={src}
                    alt={`Slide ${index + 1}`}
                    className="w-full h-full object-cover"
                    loading="lazy"
                  />
                </CardContent>
              </div>
            </CarouselItem>
          ))}
        </CarouselContent>
        <CarouselPrevious className="absolute left-2 top-1/2 -translate-y-1/2 z-10" />
        <CarouselNext className="absolute right-2 top-1/2 -translate-y-1/2 z-10" />
      </Carousel>

      {/* 分页指示器 */}
      <div
        className={`absolute bottom-4 ${
          paginationPosition === 'left' ? 'left-4' : 'right-4'
        } flex gap-2 z-10`}
      >
        {Array.from({ length: count }).map((_, index) => (
          <button
            key={index}
            onClick={() => api?.scrollTo(index)}
            className={`transition-colors ${
              paginationStyle === 'dot'
                ? 'h-2 w-2 rounded-full'
                : 'h-2 w-8 rounded'
            } ${index === current ? 'bg-white' : 'bg-white/50'}`}
            aria-label={`Go to slide ${index + 1}`}
          />
        ))}
      </div>
    </div>
  );
}