# All files / src/components/user ContentRail.tsx

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     'use client';

    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>
      );
    }