"use client";

import React from 'react';
import { Swiper, SwiperSlide } from 'swiper/react';
import { Autoplay, EffectCoverflow, EffectCards } from 'swiper/modules';
import type { Swiper as SwiperType } from 'swiper/types';
import { useDeviceType } from '@/hooks/useDeviceType';

import 'swiper/css';
import 'swiper/css/effect-coverflow';
import 'swiper/css/effect-cards';

/** 默认视频列表（来自 home-page2.tsx 中的数组） */
const DEFAULT_VIDEOS: string[] = [
    'https://cdn.qikongjian.com/1756474023656_60twk5.mp4',
    'https://cdn.qikongjian.com/1756474023644_14n7is.mp4',
    'https://cdn.qikongjian.com/1756474023648_kocq6z.mp4',
    'https://cdn.qikongjian.com/1756474023657_w10boo.mp4',
    'https://cdn.qikongjian.com/1756474023657_nf8799.mp4',
    'https://cdn.qikongjian.com/1756474230992_vw0ubf.mp4',
];

export interface VideoCoverflowProps {
    title?: string;
    subtitle?: string;
    /** 视频地址数组 */
    videos?: string[];
    /** 自动播放间隔（毫秒） */
    autoplayDelay?: number;
}

/**
 * 使用 Swiper 的 Coverflow 效果展示视频，自动滚动并仅播放当前居中的视频。
 * @param {VideoCoverflowProps} props - 组件属性
 * @returns {JSX.Element} - 组件节点
 */
const VideoCoverflow: React.FC<VideoCoverflowProps> = ({
    title = '',
    subtitle = '',
    videos = DEFAULT_VIDEOS,
    autoplayDelay = 4500,
}) => {
    const swiperRef = React.useRef<SwiperType | null>(null);
    const videoRefs = React.useRef<Record<number, HTMLVideoElement | null>>({});
    const { isMobile } = useDeviceType();
    const [activeIndex, setActiveIndex] = React.useState<number>(0);

    const playActive = React.useCallback((activeIndex: number) => {
        Object.entries(videoRefs.current).forEach(([key, el]) => {
            const video = el as HTMLVideoElement | null;
            if (!video) return;
            const index = Number(key);
            if (index === activeIndex) {
                // 尝试播放当前居中视频
                video.play().catch(() => {});
            } else {
                // 暂停其他视频，重置到起点以减少解码负担
                video.pause();
                try {
                    video.currentTime = 0;
                } catch {}
            }
        });
    }, []);

    const handleAfterInit = React.useCallback((sw: SwiperType) => {
        swiperRef.current = sw;
        const idx = sw.realIndex ?? sw.activeIndex ?? 0;
        setActiveIndex(idx);
        playActive(idx);
    }, [playActive]);

    const handleSlideChange = React.useCallback((sw: SwiperType) => {
        const idx = sw.realIndex ?? sw.activeIndex ?? 0;
        setActiveIndex(idx);
        playActive(idx);
    }, [playActive]);

    return (
        <div
            data-alt="video-coverflow-container"
            className="center h-[calc(100svh-4rem)] z-10 flex flex-col items-center justify-center lg:px-20 xl:px-30 2xl:px-40"
        >
            <h2
                className="text-white font-normal text-center
                    -mt-4
                    /* 移动端字体 */
                    text-[2rem] leading-[110%] mb-4
                    /* 平板字体 */
                    sm:-mt-6 sm:text-[2.5rem] sm:leading-[110%] sm:mb-6
                    /* 小屏笔记本字体 */
                    md:-mt-8 md:text-[3rem] md:leading-[110%] md:mb-8
                    /* 大屏笔记本字体 */
                    lg:-mt-10 lg:text-[3.25rem] lg:leading-[110%] lg:mb-10
                    /* 桌面端字体 */
                    xl:-mt-12 xl:text-[3.375rem] xl:leading-[110%] xl:mb-12
                    /* 大屏显示器字体 */
                    2xl:-mt-16 2xl:text-[3.5rem] 2xl:leading-[110%] 2xl:mb-16"
            >
                {title}
            </h2>
            <p className="text-white font-normal text-center mb-8
                    -mt-2
                    /* 移动端字体 */
                    text-[1rem] leading-[140%]
                    /* 平板字体 */
                    sm:-mt-3 sm:text-[1.25rem] sm:leading-[140%]
                    /* 小屏笔记本字体 */
                    md:-mt-4 md:text-[1.5rem] md:leading-[140%]
                    /* 大屏笔记本字体 */
                    lg:-mt-5 lg:text-[1.6rem] lg:leading-[140%]
                    /* 桌面端字体 */
                    xl:-mt-6 xl:text-[1.7rem] xl:leading-[140%]
                    /* 大屏显示器字体 */
                    2xl:-mt-8 2xl:text-[1.8rem] 2xl:leading-[140%]"
            >
                {subtitle}
            </p>
            <div data-alt="video-coverflow" className="w-screen sm:w-full mx-auto overflow-hidden">
                <Swiper
                    modules={isMobile ? [Autoplay, EffectCards] : [Autoplay, EffectCoverflow]}
                    effect={isMobile ? 'cards' : 'coverflow'}
                    key={isMobile ? 'cards' : 'coverflow'}
                    centeredSlides
                    slidesPerView={isMobile ? 1 : 2}
                    loop
                    autoplay={{ delay: autoplayDelay, disableOnInteraction: false }}
                    speed={1000}
                    {...(!isMobile ? {
                        coverflowEffect: {
                            rotate: -56,
                            stretch: 10,
                            depth: 80,
                            scale: 0.6,
                            modifier: 1,
                            slideShadows: true,
                        },
                    } : {})}
                    onAfterInit={handleAfterInit}
                    onSlideChange={handleSlideChange}
                    className="w-full"
                >
                    {videos.map((src, index) => (
                        <SwiperSlide key={src} className="select-none">
                            <div data-alt="video-card" className={`${isMobile ? 'w-screen' : 'w-[48vw]'} mx-auto aspect-video overflow-hidden rounded-xl shadow-lg`}>
                                <video
                                    data-alt="video"
                                    ref={(el) => { videoRefs.current[index] = el; }}
                                    src={src}
                                    className="h-full w-full object-cover"
                                    muted
                                    playsInline
                                    loop
                                    preload="metadata"
                                    onLoadedData={() => {
                                        // 进入视口/初始化后，确保当前是激活项就播放
                                        const sw = swiperRef.current;
                                        if (!sw) return;
                                        const isActive = (sw.realIndex ?? sw.activeIndex ?? 0) === index;
                                        if (isActive) {
                                            videoRefs.current[index]?.play().catch(() => {});
                                        }
                                    }}
                                />
                            </div>
                        </SwiperSlide>
                    ))}
                </Swiper>
            </div>
        </div>
    );
};

export default React.memo(VideoCoverflow);