'use client';

import Link from 'next/link';
import Image from 'next/image';
import { useState, useCallback } from 'react';
import { VideoData } from '@/app/constants';
import LoadingSpinner from './LoadingSpinner';

function formatViews(views: number): string {
    if (views >= 1000000) return (views / 1000000).toFixed(1) + 'M';
    if (views >= 1000) return (views / 1000).toFixed(1) + 'K';
    return views.toString();
}

function getStableRelativeTime(id: string): string {
    const times = ['2 hours ago', '5 hours ago', '1 day ago', '3 days ago', '1 week ago', '2 weeks ago', '1 month ago'];
    const hash = id.split('').reduce((acc, char) => acc + char.charCodeAt(0), 0);
    return times[hash % times.length];
}

import { memo } from 'react';

const DEFAULT_THUMBNAIL = 'https://i.ytimg.com/vi/default/hqdefault.jpg';

function VideoCard({ video, hideChannelAvatar }: { video: VideoData; hideChannelAvatar?: boolean }) {
    const relativeTime = video.upload_date || video.publishedAt || getStableRelativeTime(video.id);
    const [isNavigating, setIsNavigating] = useState(false);
    const destination = video.list_id ? `/watch?v=${video.id}&list=${video.list_id}` : `/watch?v=${video.id}`;
    const thumbnailSrc = video.thumbnail || DEFAULT_THUMBNAIL;

    const handleImageError = useCallback((e: React.SyntheticEvent<HTMLImageElement>) => {
        const img = e.target as HTMLImageElement;
        if (img.src !== DEFAULT_THUMBNAIL) {
            img.src = DEFAULT_THUMBNAIL;
        }
    }, []);

    return (
        <div style={{ display: 'flex', flexDirection: 'column', gap: '12px', width: '100%', marginBottom: '12px' }} className="videocard-container">
            <Link
                href={destination}
                onClick={() => setIsNavigating(true)}
                style={{ position: 'relative', display: 'block', width: '100%', aspectRatio: '16/9', overflow: 'hidden', borderRadius: '12px' }}
            >
                <Image
                    src={thumbnailSrc}
                    alt={video.title}
                    fill
                    sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw"
                    style={{ objectFit: 'cover', backgroundColor: 'var(--yt-hover)' }}
                    className="videocard-thumb"
                    priority={false}
                    onError={handleImageError}
                />
                {video.duration && !video.is_mix && (
                    <div className="duration-badge" style={{ position: 'absolute', bottom: '8px', right: '8px' }}>
                        {video.duration}
                    </div>
                )}
                
                {video.is_mix && (
                    <div style={{
                        position: 'absolute', bottom: 0, right: 0,
                        backgroundColor: 'rgba(0, 0, 0, 0.8)', color: 'white',
                        padding: '4px 8px', fontSize: '12px', fontWeight: 500,
                        borderTopLeftRadius: '8px', zIndex: 5,
                        display: 'flex', alignItems: 'center', gap: '4px'
                    }}>
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><path d="M22 7H2v1h20V7zm-9 5H2v-1h11v1zm0 4H2v-1h11v1zm2 3v-8l7 4-7 4z"></path></svg>
                        Mix
                    </div>
                )}

                {isNavigating && (
                    <div style={{
                        position: 'absolute', top: 0, left: 0, right: 0, bottom: 0,
                        backgroundColor: 'rgba(0, 0, 0, 0.5)',
                        display: 'flex', alignItems: 'center', justifyContent: 'center',
                        zIndex: 10
                    }}>
                        <LoadingSpinner color="white" />
                    </div>
                )}
            </Link>

            <div style={{ display: 'flex', gap: '12px', padding: '0 12px' }} className="videocard-info">
                {/* Video Info */}
                <div style={{ display: 'flex', flexDirection: 'column', minWidth: 0 }}>
                    <Link href={destination} style={{ textDecoration: 'none' }}>
                        <h3 className="truncate-2-lines" style={{ fontSize: '16px', fontWeight: 500, lineHeight: '22px', margin: 0, color: 'var(--yt-text-primary)', transition: 'color 0.2s' }}>
                            {video.title}
                        </h3>
                    </Link>
                    <div style={{ marginTop: '4px' }}>
                        {video.channel_id ? (
                            <Link href={`/channel/${video.channel_id}`} style={{ fontSize: '14px', color: 'var(--yt-text-secondary)', display: 'block', textDecoration: 'none', transition: 'color 0.2s' }} className="channel-link-hover">
                                {video.uploader || video.channelTitle || 'Unknown'}
                            </Link>
                        ) : (
                            <div style={{ fontSize: '14px', color: 'var(--yt-text-secondary)', display: 'block' }}>
                                {video.uploader || video.channelTitle || 'Unknown'}
                            </div>
                        )}
                        <div style={{ fontSize: '14px', color: 'var(--yt-text-secondary)', marginTop: '2px' }}>
                            {formatViews(video.view_count ?? 0)} views • {relativeTime}
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
}

export default memo(VideoCard);