import { useApp } from '../store';
import { getChannel, getChannelPlaylists, getPlaylistVideos, standaloneVideos, formatNumber, getCategoryColor } from '../data';
import { ArrowRight, Play, List, CheckCircle, Users, Video } from 'lucide-react';

export default function ChannelView({ channelId }: { channelId: string }) {
  const { setView, progress, followedChannelIds, followChannel, unfollowChannel } = useApp();
  const channel = getChannel(channelId);

  if (!channel) {
    return <div className="p-8 text-center text-gray-400">القناة غير موجودة</div>;
  }

  const isFollowed = followedChannelIds.includes(channelId);
  const channelPlaylists = getChannelPlaylists(channelId);
  const channelStandalone = standaloneVideos.filter(v => v.channelId === channelId);
  
  const totalVideos = channelPlaylists.reduce((sum, pl) => sum + (getPlaylistVideos(pl.id)?.length || 0), 0) + channelStandalone.length;
  const watchedCount = [
    ...channelStandalone,
    ...channelPlaylists.flatMap(pl => getPlaylistVideos(pl.id) || [])
  ].filter(v => progress.watchedVideos.includes(v.id)).length;

  return (
    <div className="h-screen overflow-y-auto custom-scrollbar animate-slide-up">
      {/* Channel Header */}
      <div className={`bg-gradient-to-l ${channel.gradient} p-8 relative overflow-hidden`}>
        <div className="absolute inset-0 bg-black/20" />
        <div className="absolute inset-0 bg-[url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNjAiIGhlaWdodD0iNjAiIHZpZXdCb3g9IjAgMCA2MCA2MCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48Y2lyY2xlIGN4PSIzMCIgY3k9IjMwIiByPSIxLjUiIGZpbGw9InJnYmEoMjU1LDI1NSwyNTUsMC4wOCkiLz48L3N2Zz4=')] " />
        
        <div className="relative">
          <button
            onClick={() => setView({ type: 'dashboard' })}
            className="flex items-center gap-1 text-white/80 hover:text-white text-sm mb-4 transition-colors"
          >
            <ArrowRight className="w-4 h-4" />
            العودة للرئيسية
          </button>
          
          <div className="flex items-start gap-4">
            <div className="w-20 h-20 rounded-2xl bg-white/20 backdrop-blur-sm flex items-center justify-center text-5xl shadow-2xl">
              {channel.emoji}
            </div>
            <div className="flex-1">
              <h1 className="text-2xl font-black text-white mb-1">{channel.name}</h1>
              <p className="text-white/70 text-sm mb-3 max-w-lg">{channel.description}</p>
              <div className="flex items-center gap-4 text-white/60 text-xs">
                <span className="flex items-center gap-1"><Users className="w-3.5 h-3.5" /> {formatNumber(channel.subscriberCount)} مشترك</span>
                <span className="flex items-center gap-1"><Video className="w-3.5 h-3.5" /> {channel.videoCount} فيديو</span>
                <span className="flex items-center gap-1"><List className="w-3.5 h-3.5" /> {channelPlaylists.length} قائمة تشغيل</span>
              </div>
            </div>
            <button
              onClick={() => isFollowed ? unfollowChannel(channelId) : followChannel(channelId)}
              className={`px-6 py-2.5 rounded-xl font-bold text-sm transition-all ${
                isFollowed
                  ? 'bg-white/20 text-white hover:bg-white/30 backdrop-blur-sm'
                  : 'bg-white text-gray-800 hover:bg-gray-100 shadow-lg'
              }`}
            >
              {isFollowed ? '✓ متابَع' : '+ متابعة'}
            </button>
          </div>

          {/* Categories */}
          <div className="flex gap-2 mt-4 flex-wrap">
            {channel.categories.map(cat => (
              <span key={cat} className={`text-[10px] px-2.5 py-1 rounded-full ${getCategoryColor(cat)}`}>
                {cat}
              </span>
            ))}
          </div>
        </div>
      </div>

      {/* Stats */}
      <div className="px-6 py-4 flex gap-3">
        <div className="bg-white rounded-xl px-4 py-2.5 flex items-center gap-2 shadow-sm border border-gray-100">
          <div className="text-sm font-black text-orange-500">{watchedCount}/{totalVideos}</div>
          <div className="text-[10px] text-gray-400">فيديو مُشاهد</div>
        </div>
        <div className="bg-white rounded-xl px-4 py-2.5 flex items-center gap-2 shadow-sm border border-gray-100">
          <div className="text-sm font-black text-emerald-500">
            {channelPlaylists.filter(pl => progress.completedPlaylists.includes(pl.id)).length}/{channelPlaylists.length}
          </div>
          <div className="text-[10px] text-gray-400">قوائم مكتملة</div>
        </div>
        {totalVideos > 0 && (
          <div className="flex-1 bg-white rounded-xl px-4 py-2.5 flex items-center gap-3 shadow-sm border border-gray-100">
            <div className="text-[10px] text-gray-400">التقدم الكلي</div>
            <div className="flex-1 h-2 bg-gray-100 rounded-full overflow-hidden">
              <div className="h-full bg-gradient-to-l from-orange-400 to-emerald-400 rounded-full" style={{ width: `${(watchedCount / totalVideos) * 100}%` }} />
            </div>
            <div className="text-xs font-bold text-gray-600">{Math.round((watchedCount / totalVideos) * 100)}%</div>
          </div>
        )}
      </div>

      {/* Playlists */}
      <div className="px-6 pb-6">
        <h3 className="text-lg font-bold text-gray-800 flex items-center gap-2 mb-4">
          <List className="w-5 h-5 text-purple-500" />
          قوائم التشغيل ({channelPlaylists.length})
        </h3>
        
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 mb-8">
          {channelPlaylists.map(pl => {
            const plVideos = getPlaylistVideos(pl.id);
            const completedCount = plVideos.filter(v => progress.watchedVideos.includes(v.id)).length;
            const percentage = plVideos.length > 0 ? Math.round((completedCount / plVideos.length) * 100) : 0;
            const isComplete = progress.completedPlaylists.includes(pl.id);
            
            return (
              <button
                key={pl.id}
                onClick={() => setView({ type: 'playlist', playlistId: pl.id })}
                className="group bg-white rounded-2xl shadow-sm hover:shadow-xl transition-all duration-300 overflow-hidden text-right border border-gray-100 hover:border-purple-200"
              >
                <div className="relative">
                  <div className={`h-28 bg-gradient-to-br ${pl.gradient} flex items-center justify-center`}>
                    <span className="text-5xl opacity-40 group-hover:opacity-70 transition-opacity">{pl.emoji}</span>
                  </div>
                  <div className="absolute inset-0 bg-gradient-to-t from-black/60 to-transparent" />
                  <div className="absolute bottom-2 right-3 left-3 flex justify-between items-end">
                    <div className="flex items-center gap-1 bg-black/50 rounded-lg px-2 py-1 text-white text-[10px]">
                      <Play className="w-3 h-3" />
                      {plVideos.length} فيديو
                    </div>
                    {isComplete && (
                      <div className="bg-emerald-500 rounded-lg px-2 py-1 text-white text-[10px] font-bold flex items-center gap-1">
                        <CheckCircle className="w-3 h-3" />
                        مكتملة
                      </div>
                    )}
                  </div>
                </div>
                <div className="p-4">
                  <h4 className="font-bold text-gray-800 text-sm mb-1 group-hover:text-purple-600 transition-colors">{pl.title}</h4>
                  <p className="text-[11px] text-gray-400 mb-3 line-clamp-2">{pl.description}</p>
                  <div className="h-1.5 bg-gray-100 rounded-full overflow-hidden">
                    <div
                      className={`h-full rounded-full transition-all duration-700 ${percentage === 100 ? 'bg-emerald-400' : 'bg-gradient-to-l from-purple-400 to-pink-400'}`}
                      style={{ width: `${percentage}%` }}
                    />
                  </div>
                  <div className="flex justify-between mt-1.5 text-[10px]">
                    <span className="text-gray-400">{completedCount}/{plVideos.length}</span>
                    <span className={`font-bold ${percentage === 100 ? 'text-emerald-500' : 'text-purple-500'}`}>{percentage}%</span>
                  </div>
                </div>
              </button>
            );
          })}
        </div>

        {/* Standalone Videos */}
        {channelStandalone.length > 0 && (
          <>
            <h3 className="text-lg font-bold text-gray-800 flex items-center gap-2 mb-4">
              <Video className="w-5 h-5 text-orange-500" />
              فيديوهات حديثة
            </h3>
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
              {channelStandalone.map(video => {
                const isWatched = progress.watchedVideos.includes(video.id);
                return (
                  <button
                    key={video.id}
                    onClick={() => {
                      setView({ type: 'video', videoId: video.id });
                    }}
                    className="group bg-white rounded-2xl shadow-sm hover:shadow-xl transition-all duration-300 overflow-hidden text-right border border-gray-100 hover:border-orange-200 flex items-center gap-3 p-3"
                  >
                    <div className={`w-24 h-16 rounded-xl bg-gradient-to-br ${channel.gradient} flex items-center justify-center shrink-0 relative`}>
                      <Play className="w-6 h-6 text-white/70 group-hover:text-white transition-colors" />
                      <span className="absolute bottom-1 left-1 bg-black/60 text-white text-[9px] px-1 rounded">
                        {video.duration}
                      </span>
                      {isWatched && <CheckCircle className="w-3.5 h-3.5 text-emerald-400 absolute top-1 right-1" />}
                    </div>
                    <div className="flex-1 min-w-0">
                      <h4 className="text-xs font-bold text-gray-800 line-clamp-2 group-hover:text-orange-600 transition-colors">{video.title}</h4>
                      <div className="text-[10px] text-gray-400 mt-1">{formatNumber(video.viewCount)} مشاهدة</div>
                    </div>
                  </button>
                );
              })}
            </div>
          </>
        )}
      </div>
    </div>
  );
}