import { useEffect, useRef, useState } from "react";
import { type Video } from "@shared/schema";
import Hls from "hls.js";
import { X, Volume2, VolumeX, Play, Pause, Maximize, SkipForward } from "lucide-react";
import { Button } from "@/components/ui/button";

interface VASTPlayerProps {
  video: Video;
  onClose: () => void;
  vastTagUrl?: string;
  enableAds?: boolean;
}

// VAST Ad Network Configuration
const AD_NETWORKS = {
  publift: {
    name: "Publift",
    vastUrl: "https://publiftvast.example.com/vast?zone=video&w=854&h=480",
    priority: 1
  },
  vdo: {
    name: "Vdo.ai", 
    vastUrl: "https://vdo.ai/vast?publisher_id=123&zone=preroll",
    priority: 2
  },
  adplayer: {
    name: "AdPlayer.Pro",
    vastUrl: "https://adplayer.pro/vast?site_id=456&format=preroll",
    priority: 3
  },
  aniview: {
    name: "Aniview",
    vastUrl: "https://aniview.com/vast?pub=789&placement=video",
    priority: 4
  }
};

// VAST Ad States
enum AdState {
  LOADING = "loading",
  PLAYING = "playing", 
  PAUSED = "paused",
  COMPLETED = "completed",
  SKIPPED = "skipped",
  ERROR = "error"
}

export default function VASTPlayer({ video, onClose, vastTagUrl, enableAds = true }: VASTPlayerProps) {
  const videoRef = useRef<HTMLVideoElement>(null);
  const adVideoRef = useRef<HTMLVideoElement>(null);
  const hlsRef = useRef<Hls | null>(null);
  const adContainerRef = useRef<HTMLDivElement>(null);
  
  // Video Player States
  const [isPlaying, setIsPlaying] = useState(false);
  const [isMuted, setIsMuted] = useState(false);
  const [currentTime, setCurrentTime] = useState(0);
  const [duration, setDuration] = useState(0);
  const [volume, setVolume] = useState(1);
  
  // VAST Ad States
  const [adState, setAdState] = useState<AdState>(AdState.LOADING);
  const [isAdPlaying, setIsAdPlaying] = useState(false);
  const [adDuration, setAdDuration] = useState(0);
  const [adCurrentTime, setAdCurrentTime] = useState(0);
  const [canSkipAd, setCanSkipAd] = useState(false);
  const [skipCountdown, setSkipCountdown] = useState(5);
  const [currentAdNetwork, setCurrentAdNetwork] = useState<string | null>(null);

  // Initialize VAST Ad System
  useEffect(() => {
    if (enableAds) {
      initializeVASTSystem();
    } else {
      initializeMainVideo();
    }
  }, [video, enableAds]);

  const initializeVASTSystem = async () => {
    console.log("🎯 Initializing VAST Ad System for go4.video");
    
    // Waterfall approach - try ad networks in priority order
    const networks = Object.entries(AD_NETWORKS).sort((a, b) => a[1].priority - b[1].priority);
    
    for (const [networkId, network] of networks) {
      try {
        console.log(`📡 Attempting to load ads from ${network.name}`);
        const success = await loadVASTAd(network.vastUrl, networkId);
        if (success) {
          setCurrentAdNetwork(networkId);
          console.log(`✅ Successfully loaded ads from ${network.name}`);
          break;
        }
      } catch (error) {
        console.warn(`⚠️ Failed to load ads from ${network.name}:`, error);
        continue;
      }
    }
    
    // Fallback to main video if no ads load
    if (!currentAdNetwork) {
      console.log("📺 No ads available, playing main video");
      initializeMainVideo();
    }
  };

  const loadVASTAd = async (vastUrl: string, networkId: string): Promise<boolean> => {
    return new Promise((resolve) => {
      const adVideo = adVideoRef.current;
      if (!adVideo) {
        resolve(false);
        return;
      }

      // Simulate VAST ad loading (in production, use real VAST parser)
      setTimeout(() => {
        // Mock ad video URL (replace with real VAST-parsed ad URL)
        const mockAdUrl = "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4";
        
        adVideo.src = mockAdUrl;
        adVideo.muted = false;
        adVideo.volume = volume;
        
        adVideo.addEventListener('loadedmetadata', () => {
          setAdDuration(adVideo.duration);
          setAdState(AdState.PLAYING);
          setIsAdPlaying(true);
          startSkipCountdown();
          resolve(true);
        }, { once: true });

        adVideo.addEventListener('error', () => {
          console.error(`❌ Ad failed to load from ${networkId}`);
          resolve(false);
        }, { once: true });

        adVideo.load();
      }, 1000); // Simulate network delay
    });
  };

  const startSkipCountdown = () => {
    const countdown = setInterval(() => {
      setSkipCountdown((prev) => {
        if (prev <= 1) {
          setCanSkipAd(true);
          clearInterval(countdown);
          return 0;
        }
        return prev - 1;
      });
    }, 1000);
  };

  const skipAd = () => {
    console.log("⏭️ User skipped ad");
    setAdState(AdState.SKIPPED);
    setIsAdPlaying(false);
    initializeMainVideo();
    
    // Track ad skip for analytics
    if (currentAdNetwork) {
      trackAdEvent('skip', currentAdNetwork);
    }
  };

  const trackAdEvent = (event: string, network: string) => {
    console.log(`📊 Ad Event: ${event} on ${network}`);
    // In production, send to analytics service
  };

  const initializeMainVideo = () => {
    console.log("🎬 Initializing main video playback");
    const videoElement = videoRef.current;
    if (!videoElement) return;

    // Clean up previous HLS instance
    if (hlsRef.current) {
      hlsRef.current.destroy();
      hlsRef.current = null;
    }

    const videoUrl = video.videoUrl;

    if (videoUrl.includes('.m3u8')) {
      if (Hls.isSupported()) {
        const hls = new Hls({
          debug: false,
          enableWorker: true,
          lowLatencyMode: false,
          startLevel: -1,
          capLevelToPlayerSize: true,
          maxLoadingDelay: 4,
          maxBufferLength: 30,
          maxBufferSize: 60 * 1000 * 1000,
        });

        hls.loadSource(videoUrl);
        hls.attachMedia(videoElement);
        
        hls.on(Hls.Events.MANIFEST_PARSED, () => {
          console.log("📺 HLS manifest loaded for main video");
          videoElement.play();
          setIsPlaying(true);
        });

        hlsRef.current = hls;
      }
    }
  };

  // Ad video event handlers
  useEffect(() => {
    const adVideo = adVideoRef.current;
    if (!adVideo) return;

    const handleAdTimeUpdate = () => {
      setAdCurrentTime(adVideo.currentTime);
    };

    const handleAdEnded = () => {
      console.log("✅ Ad completed successfully");
      setAdState(AdState.COMPLETED);
      setIsAdPlaying(false);
      initializeMainVideo();
      
      if (currentAdNetwork) {
        trackAdEvent('complete', currentAdNetwork);
      }
    };

    adVideo.addEventListener('timeupdate', handleAdTimeUpdate);
    adVideo.addEventListener('ended', handleAdEnded);

    return () => {
      adVideo.removeEventListener('timeupdate', handleAdTimeUpdate);
      adVideo.removeEventListener('ended', handleAdEnded);
    };
  }, [currentAdNetwork]);

  const toggleAdPlayPause = () => {
    const adVideo = adVideoRef.current;
    if (!adVideo) return;

    if (isAdPlaying) {
      adVideo.pause();
      setIsAdPlaying(false);
      setAdState(AdState.PAUSED);
    } else {
      adVideo.play();
      setIsAdPlaying(true);
      setAdState(AdState.PLAYING);
    }
  };

  const toggleMute = () => {
    const activeVideo = isAdPlaying ? adVideoRef.current : videoRef.current;
    if (!activeVideo) return;

    const newMutedState = !isMuted;
    activeVideo.muted = newMutedState;
    setIsMuted(newMutedState);
  };

  // Format time for display
  const formatTime = (seconds: number): string => {
    const minutes = Math.floor(seconds / 60);
    const remainingSeconds = Math.floor(seconds % 60);
    return `${minutes}:${remainingSeconds.toString().padStart(2, '0')}`;
  };

  return (
    <div className="modal-overlay fixed inset-0 bg-black bg-opacity-90 flex items-center justify-center" style={{ zIndex: 2147483647, position: 'fixed' }}>
      <div className="relative w-full max-w-6xl mx-4">
        {/* Close button */}
        <Button
          variant="ghost"
          size="icon"
          onClick={onClose}
          className="absolute -top-12 right-0 text-white hover:bg-white/20 z-10"
          data-testid="button-close-video"
        >
          <X className="w-6 h-6" />
        </Button>

        {/* Video Container */}
        <div className="relative bg-black rounded-lg overflow-hidden aspect-video">
          {/* Main Video */}
          <video
            ref={videoRef}
            className={`w-full h-full object-contain ${isAdPlaying ? 'hidden' : 'block'}`}
            playsInline
            onTimeUpdate={(e) => setCurrentTime(e.currentTarget.currentTime)}
            onLoadedMetadata={(e) => setDuration(e.currentTarget.duration)}
          />

          {/* Ad Video */}
          <video
            ref={adVideoRef}
            className={`w-full h-full object-contain ${isAdPlaying ? 'block' : 'hidden'}`}
            playsInline
            autoPlay
          />

          {/* Ad Overlay */}
          {isAdPlaying && (
            <div className="absolute top-4 left-4 right-4">
              {/* Ad Network Badge */}
              <div className="flex justify-between items-center">
                <div className="bg-yellow-600 text-white px-3 py-1 rounded-full text-sm font-medium">
                  📺 Ad {currentAdNetwork && `• ${AD_NETWORKS[currentAdNetwork as keyof typeof AD_NETWORKS].name}`}
                </div>
                
                {/* Skip Ad Button */}
                {canSkipAd ? (
                  <Button
                    onClick={skipAd}
                    className="bg-gray-800 hover:bg-gray-700 text-white px-4 py-2 rounded-full text-sm"
                    data-testid="button-skip-ad"
                  >
                    <SkipForward className="w-4 h-4 mr-2" />
                    Skip Ad
                  </Button>
                ) : (
                  <div className="bg-gray-800 text-white px-4 py-2 rounded-full text-sm">
                    Skip in {skipCountdown}s
                  </div>
                )}
              </div>

              {/* Ad Progress */}
              <div className="mt-2 bg-gray-800 rounded-full h-1">
                <div 
                  className="bg-yellow-600 h-full rounded-full transition-all duration-100"
                  style={{ width: `${adDuration ? (adCurrentTime / adDuration) * 100 : 0}%` }}
                />
              </div>
            </div>
          )}

          {/* Video Controls */}
          <div className="absolute bottom-4 left-4 right-4">
            <div className="bg-black/70 backdrop-blur-sm rounded-lg p-4">
              <div className="flex items-center space-x-4">
                {/* Play/Pause */}
                <Button
                  variant="ghost"
                  size="icon"
                  onClick={isAdPlaying ? toggleAdPlayPause : () => {
                    const video = videoRef.current;
                    if (!video) return;
                    if (isPlaying) {
                      video.pause();
                      setIsPlaying(false);
                    } else {
                      video.play();
                      setIsPlaying(true);
                    }
                  }}
                  className="text-white hover:bg-white/20"
                >
                  {(isAdPlaying ? isAdPlaying : isPlaying) ? 
                    <Pause className="w-5 h-5" /> : 
                    <Play className="w-5 h-5" />
                  }
                </Button>

                {/* Volume */}
                <Button
                  variant="ghost"
                  size="icon"
                  onClick={toggleMute}
                  className="text-white hover:bg-white/20"
                >
                  {isMuted ? <VolumeX className="w-5 h-5" /> : <Volume2 className="w-5 h-5" />}
                </Button>

                {/* Time Display */}
                <div className="text-white text-sm">
                  {isAdPlaying ? 
                    `${formatTime(adCurrentTime)} / ${formatTime(adDuration)}` :
                    `${formatTime(currentTime)} / ${formatTime(duration)}`
                  }
                </div>

                <div className="flex-1" />

                {/* Fullscreen */}
                <Button
                  variant="ghost"
                  size="icon"
                  onClick={() => {
                    const container = document.querySelector('.video-container');
                    if (container && container.requestFullscreen) {
                      container.requestFullscreen();
                    }
                  }}
                  className="text-white hover:bg-white/20"
                >
                  <Maximize className="w-5 h-5" />
                </Button>
              </div>

              {/* Progress Bar */}
              {!isAdPlaying && (
                <div className="mt-3">
                  <div className="bg-gray-600 rounded-full h-1 cursor-pointer"
                    onClick={(e) => {
                      const video = videoRef.current;
                      if (!video || !duration) return;
                      
                      const rect = e.currentTarget.getBoundingClientRect();
                      const x = e.clientX - rect.left;
                      const percentage = x / rect.width;
                      const newTime = percentage * duration;
                      
                      video.currentTime = newTime;
                      setCurrentTime(newTime);
                    }}
                  >
                    <div 
                      className="bg-bunny-blue h-full rounded-full transition-all duration-100"
                      style={{ width: `${duration ? (currentTime / duration) * 100 : 0}%` }}
                    />
                  </div>
                </div>
              )}
            </div>
          </div>
        </div>

        {/* Video Info */}
        <div className="mt-6 text-white">
          <h2 className="text-2xl font-bold mb-2">{video.title}</h2>
          <div className="flex items-center space-x-4 text-bunny-muted">
            <span>{video.views} views</span>
            <span>•</span>
            <span>{new Date(video.createdAt).toLocaleDateString('sl-SI')}</span>
            {currentAdNetwork && (
              <>
                <span>•</span>
                <span className="text-yellow-500">
                  💰 Monetized with {AD_NETWORKS[currentAdNetwork as keyof typeof AD_NETWORKS].name}
                </span>
              </>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}