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import React, { useRef, useState } from 'react';
import { ChevronLeft, ChevronRight, ArrowRight } from 'lucide-react';
import { useTranslation } from 'react-i18next';
import Link from 'next/link';
import { cn } from '@/lib/utils';
import type { DiscoveryMediaItem } from '@/types';
import { ContentCard } from './ContentCard';
import { Button } from '@/components/ui/button';
interface ContentRailProps {
title: string;
subtitle?: string;
icon?: React.ReactNode;
items: DiscoveryMediaItem[];
isLoading?: boolean;
emptyLabel?: string;
viewAllHref?: string;
aspectRatio?: 'poster' | 'video';
onEndReached?: () => void;
}
export function ContentRail({
title,
subtitle,
icon,
items,
isLoading = false,
emptyLabel,
viewAllHref,
aspectRatio = 'poster'}: ContentRailProps) {
const { t } = useTranslation();
const scrollContainerRef = useRef<HTMLDivElement>(null);
const [showLeftArrow, setShowLeftArrow] = useState(false);
const [showRightArrow, setShowRightArrow] = useState(true);
const handleScroll = () => {
if (scrollContainerRef.current) {
const { scrollLeft, scrollWidth, clientWidth } = scrollContainerRef.current;
setShowLeftArrow(scrollLeft > 0);
setShowRightArrow(scrollLeft < scrollWidth - clientWidth - 10);
}
};
const scroll = (direction: 'left' | 'right') => {
if (scrollContainerRef.current) {
const container = scrollContainerRef.current;
const scrollAmount = container.clientWidth * 0.8;
container.scrollBy({
left: direction === 'left' ? -scrollAmount : scrollAmount,
behavior: 'smooth'
});
}
};
// Skeleton Loading State
if (isLoading) {
const skeletonCount = 6;
const widthClass = aspectRatio === 'poster' ? 'w-[160px] sm:w-[180px] md:w-[200px]' : 'w-[260px] sm:w-[280px] md:w-[320px]';
const aspectClass = aspectRatio === 'poster' ? 'aspect-[2/3]' : 'aspect-[16/9]';
return (
<section className="space-y-4 py-4 relative group/rail">
<div className="flex items-center gap-3 px-6 sm:px-10">
{/* Skeleton Title */}
<div className="h-7 w-48 bg-slate-800/50 rounded-md animate-pulse" />
</div>
<div className="flex gap-4 overflow-hidden px-6 sm:px-10 pb-4">
{Array.from({ length: skeletonCount }).map((_, i) => (
<div
key={`skel-${i}`}
className={cn(
"shrink-0 bg-slate-800/40 rounded-lg animate-pulse",
widthClass,
aspectClass
)}
/>
))}
</div>
</section>
);
}
if (!items || items.length === 0) {
// Optional: Render nothing or an empty state
if (!emptyLabel) return null;
return (
<section className="space-y-4 py-6 px-6 sm:px-10">
<div className="flex items-center gap-2 mb-4">
{icon}
<h3 className="text-xl font-bold text-white">{title}</h3>
</div>
<div className="p-8 rounded-xl border border-dashed border-slate-800 bg-slate-900/30 text-center">
<p className="text-slate-400">{emptyLabel}</p>
</div>
</section>
);
}
return (
<section className="space-y-4 py-2 group/rail relative">
{/* Header */}
<div className="flex items-end justify-between px-6 sm:px-10 mb-2">
<div className="space-y-1">
<div className="flex items-center gap-2">
{/* Accent Line */}
<div className="w-1 h-6 bg-blue-600 rounded-full mr-1" />
<h3 className="text-xl sm:text-2xl font-bold text-white tracking-tight drop-shadow-sm">
{title}
</h3>
{icon && <span className="text-slate-400 ml-1 opacity-80">{icon}</span>}
</div>
{subtitle && (
<p className="text-sm text-slate-400 font-medium pl-4">{subtitle}</p>
)}
</div>
{viewAllHref && (
<Link
href={viewAllHref}
className="group/link flex items-center gap-1 text-sm font-semibold text-blue-400 hover:text-blue-300 transition-colors"
>
<span>{t('user.common.viewAll')}</span>
<ArrowRight className="w-4 h-4 transition-transform group-hover/link:translate-x-1" />
</Link>
)}
</div>
{/* Rail Container */}
<div className="relative">
{/* Left Scroll Button - Only visible on hover and if scrolled */}
<button
onClick={() => scroll('left')}
className={cn(
"absolute left-0 top-0 bottom-4 z-20 w-12 sm:w-16 bg-gradient-to-r from-black/80 to-transparent flex items-center justify-center opacity-0 group-hover/rail:opacity-100 transition-opacity duration-300 disabled:opacity-0",
!showLeftArrow && "hidden"
)}
aria-label={t('common.previous')}
>
<ChevronLeft className="w-8 h-8 text-white drop-shadow-lg hover:scale-110 transition-transform" />
</button>
{/* Scrollable Area */}
<div
ref={scrollContainerRef}
onScroll={handleScroll}
className="flex gap-4 overflow-x-auto pb-8 pt-2 px-6 sm:px-10 scrollbar-none snap-x snap-mandatory"
style={{ scrollbarWidth: 'none', msOverflowStyle: 'none' }}
>
{items.map((item) => (
<div key={item.id} className="snap-start shrink-0">
<ContentCard
item={item}
aspectRatio={aspectRatio}
showProgress={item.badges?.includes('continue') || item.progress !== undefined}
/>
</div>
))}
{/* Spacer for end padding */}
<div className="w-2 shrink-0" />
</div>
{/* Right Scroll Button */}
<button
onClick={() => scroll('right')}
className={cn(
"absolute right-0 top-0 bottom-4 z-20 w-12 sm:w-16 bg-gradient-to-l from-black/80 to-transparent flex items-center justify-center opacity-0 group-hover/rail:opacity-100 transition-opacity duration-300 disabled:opacity-0",
!showRightArrow && "hidden"
)}
aria-label={t('common.next')}
>
<ChevronRight className="w-8 h-8 text-white drop-shadow-lg hover:scale-110 transition-transform" />
</button>
</div>
</section>
);
}
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