'use client';

import Link from 'next/link';
import { Video } from '@/lib/types';
import Image from 'next/image';
import React from 'react';
import { Card } from '@/components/ui/Card';
import { Icons } from '@/components/ui/Icon';

interface PremiumContentGridProps {
    videos: Video[];
    loading: boolean;
    hasMore: boolean;
    onVideoClick?: (video: Video) => void;
    prefetchRef: React.RefObject<HTMLDivElement | null>;
    loadMoreRef: React.RefObject<HTMLDivElement | null>;
}

export function PremiumContentGrid({
    videos,
    loading,
    hasMore,
    onVideoClick,
    prefetchRef,
    loadMoreRef,
}: PremiumContentGridProps) {
    if (videos.length === 0 && !loading) {
        return <PremiumGridEmpty />;
    }

    return (
        <>
            <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 gap-4 md:gap-6">
                {videos.map((video) => (
                    <Link
                        key={`${video.source}-${video.vod_id}`}
                        href={`/premium?q=${encodeURIComponent(video.vod_name)}`}
                        onClick={(e: React.MouseEvent<HTMLAnchorElement>) => {
                            // Allow default behavior for modifier keys (new tab, etc.)
                            if (e.metaKey || e.ctrlKey || e.shiftKey || e.altKey) return;

                            e.preventDefault();
                            onVideoClick?.(video);
                        }}
                        className="group cursor-pointer hover:translate-y-[-2px] transition-transform duration-200 ease-out"
                        style={{
                            position: 'relative',
                            zIndex: 1,
                            contentVisibility: 'auto'
                        }}
                        onMouseEnter={(e: React.MouseEvent<HTMLAnchorElement>) => (e.currentTarget.style.zIndex = '100')}
                        onMouseLeave={(e: React.MouseEvent<HTMLAnchorElement>) => (e.currentTarget.style.zIndex = '1')}
                    >
                        <Card hover={false} className="p-0 h-full shadow-[0_2px_8px_var(--shadow-color)] hover:shadow-[0_8px_24px_var(--shadow-color)] transition-shadow duration-200 ease-out" blur={false}>
                            <div className="relative aspect-[2/3] bg-[var(--glass-bg)] rounded-[var(--radius-2xl)]">
                                {video.vod_pic ? (
                                    <Image
                                        src={video.vod_pic}
                                        alt={video.vod_name}
                                        fill
                                        sizes="(max-width: 640px) 50vw, (max-width: 768px) 33vw, (max-width: 1024px) 25vw, 20vw"
                                        className="object-cover transition-transform duration-300 group-hover:scale-105 rounded-[var(--radius-2xl)]"
                                        loading="eager"
                                        unoptimized
                                    />
                                ) : (
                                    <div className="w-full h-full flex items-center justify-center text-[var(--text-color-secondary)]">
                                        无封面
                                    </div>
                                )}
                                {video.vod_remarks && (
                                    <div className="absolute top-2 right-2 bg-black/80 px-2.5 py-1.5 flex items-center gap-1.5 rounded-[var(--radius-full)]">
                                        <span className="text-xs font-bold text-white">
                                            {video.vod_remarks}
                                        </span>
                                    </div>
                                )}
                            </div>
                            <div className="p-3">
                                <h3 className="font-semibold text-sm text-[var(--text-color)] line-clamp-2 group-hover:text-[var(--accent-color)] transition-colors">
                                    {video.vod_name}
                                </h3>
                                {video.type_name && (
                                    <p className="text-xs text-[var(--text-color-secondary)] mt-1">
                                        {video.type_name}
                                    </p>
                                )}
                            </div>
                        </Card>
                    </Link>
                ))}
            </div>

            {/* Prefetch Trigger - Earlier */}
            {hasMore && !loading && <div ref={prefetchRef} className="h-1" />}

            {/* Loading Indicator */}
            {loading && <PremiumGridLoading />}

            {/* Intersection Observer Target */}
            {hasMore && !loading && <div ref={loadMoreRef} className="h-20" />}

            {/* No More Content */}
            {!hasMore && videos.length > 0 && <PremiumGridNoMore />}
        </>
    );
}

function PremiumGridLoading() {
    return (
        <div className="flex justify-center py-12">
            <div className="flex flex-col items-center gap-3">
                <div className="animate-spin rounded-full h-12 w-12 border-4 border-[var(--accent-color)] border-t-transparent"></div>
                <p className="text-sm text-[var(--text-color-secondary)]">加载中...</p>
            </div>
        </div>
    );
}

function PremiumGridNoMore() {
    return (
        <div className="text-center py-12">
            <p className="text-[var(--text-color-secondary)]">没有更多内容了</p>
        </div>
    );
}

function PremiumGridEmpty() {
    return (
        <div className="text-center py-20">
            <Icons.Film size={64} className="text-[var(--text-color-secondary)] mx-auto mb-4" />
            <p className="text-[var(--text-color-secondary)]">暂无内容</p>
        </div>
    );
}