"use client";
import React, { useState, useRef, useEffect, useCallback, useMemo } from "react";
import { 
  Play, 
  Pause, 
  RotateCcw, 
  RotateCw, 
  Volume2, 
  VolumeX, 
  Download, 
  Share2, 
  Check, 
  Headphones,
  Loader2,
  Sparkles,
  ChevronDown,
  ChevronUp
} from "lucide-react";
import SafeImage from "./SafeImage";

interface PodcastInlinePlayerProps {
  podcast: {
    audioUrl?: string;
    title?: string;
    description?: string;
    cover?: string;
    productName?: string;
    fallbackCover?: string;
  };
}

const PLAYBACK_RATES = [0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.5];
const WAVEFORM_BAR_COUNT = 44;

export default function PodcastInlinePlayer({ podcast }: PodcastInlinePlayerProps) {
  const audioRef = useRef<HTMLAudioElement>(null);
  const waveformRef = useRef<HTMLDivElement>(null);
  const rateMenuRef = useRef<HTMLDivElement>(null);

  const [isPlaying, setIsPlaying] = useState(false);
  const [currentTime, setCurrentTime] = useState(0);
  const [duration, setDuration] = useState(0);
  const [volume, setVolume] = useState(1);
  const [isMuted, setIsMuted] = useState(false);
  const [playbackRate, setPlaybackRate] = useState(1);
  const [showRateMenu, setShowRateMenu] = useState(false);
  const [isBuffering, setIsBuffering] = useState(false);
  const [isCopied, setIsCopied] = useState(false);
  const [isExpandedDesc, setIsExpandedDesc] = useState(false);

  // Close rate menu when clicking outside
  useEffect(() => {
    function handleClickOutside(e: MouseEvent) {
      if (rateMenuRef.current && !rateMenuRef.current.contains(e.target as Node)) {
        setShowRateMenu(false);
      }
    }
    if (showRateMenu) {
      document.addEventListener("mousedown", handleClickOutside);
    }
    return () => {
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, [showRateMenu]);

  // Deterministic heights for waveform visualization
  const waveformHeights = useMemo(() => {
    const seed = (podcast?.title || "canina").split("").reduce((acc, char) => acc + char.charCodeAt(0), 0);
    return Array.from({ length: WAVEFORM_BAR_COUNT }).map((_, i) => {
      const pseudo = Math.sin((i + 1) * 0.45 + seed) * 0.5 + 0.5;
      return Math.max(22, Math.min(95, Math.floor(pseudo * 75 + 20)));
    });
  }, [podcast?.title]);

  const togglePlay = useCallback(() => {
    if (!audioRef.current) return;
    if (audioRef.current.paused) {
      audioRef.current.play().catch(console.error);
      setIsPlaying(true);
    } else {
      audioRef.current.pause();
      setIsPlaying(false);
    }
  }, []);

  const seekToPercent = (percent: number) => {
    if (audioRef.current && duration > 0) {
      const newTime = (percent / 100) * duration;
      audioRef.current.currentTime = Math.max(0, Math.min(duration, newTime));
      setCurrentTime(newTime);
    }
  };

  const handleWaveformClick = (e: React.MouseEvent<HTMLDivElement>) => {
    if (!waveformRef.current || duration <= 0) return;
    const rect = waveformRef.current.getBoundingClientRect();
    const clickX = e.clientX - rect.left;
    const percent = Math.max(0, Math.min(100, (clickX / rect.width) * 100));
    seekToPercent(percent);
  };

  const skipTime = (seconds: number) => {
    if (audioRef.current) {
      audioRef.current.currentTime = Math.max(0, Math.min(audioRef.current.duration || 0, audioRef.current.currentTime + seconds));
    }
  };

  const handleRateChange = (rate: number) => {
    if (audioRef.current) {
      audioRef.current.playbackRate = rate;
      setPlaybackRate(rate);
      setShowRateMenu(false);
    }
  };

  const toggleMute = () => {
    if (audioRef.current) {
      audioRef.current.muted = !isMuted;
      setIsMuted(!isMuted);
    }
  };

  const handleVolumeChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const val = Number(e.target.value);
    setVolume(val);
    if (audioRef.current) {
      audioRef.current.volume = val;
      if (val === 0) {
        setIsMuted(true);
        audioRef.current.muted = true;
      } else {
        setIsMuted(false);
        audioRef.current.muted = false;
      }
    }
  };

  const handleShare = async () => {
    const shareUrl = typeof window !== 'undefined' ? window.location.href : '';
    if (navigator.share) {
      try {
        await navigator.share({
          title: podcast?.title || 'پادکست و بررسی بالینی مکمل کنینا',
          text: podcast?.description || '',
          url: shareUrl
        });
      } catch {
        // Fallback
      }
    } else {
      try {
        await navigator.clipboard.writeText(shareUrl);
        setIsCopied(true);
        setTimeout(() => setIsCopied(false), 2500);
      } catch (err) {
        console.error('Copy failed:', err);
      }
    }
  };

  const handleDownload = () => {
    if (!podcast?.audioUrl) return;
    const a = document.createElement('a');
    a.href = podcast.audioUrl;
    a.download = `${podcast.title || 'canina-podcast'}.mp3`;
    a.target = '_blank';
    a.rel = 'noopener noreferrer';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
  };

  const formatTime = (secs: number) => {
    if (isNaN(secs) || secs < 0) return "00:00";
    const mins = Math.floor(secs / 60);
    const remainingSecs = Math.floor(secs % 60);
    return `${mins.toString().padStart(2, "0")}:${remainingSecs.toString().padStart(2, "0")}`;
  };

  const displayCover = podcast.cover || podcast.fallbackCover || '/images/default-podcast.png';
  const progressPercent = duration > 0 ? (currentTime / duration) * 100 : 0;
  const volumePercent = isMuted ? 0 : volume * 100;

  return (
    <div className="bg-gradient-to-br from-neutral-900 via-neutral-900 to-black rounded-3xl overflow-hidden shadow-xl border border-white/10 p-6 text-white group" dir="rtl">
      {/* Hidden Audio Tag */}
      <audio
        ref={audioRef}
        src={podcast.audioUrl}
        preload="none"
        onPlay={() => setIsPlaying(true)}
        onPause={() => setIsPlaying(false)}
        onTimeUpdate={() => {
          if (audioRef.current) setCurrentTime(audioRef.current.currentTime);
        }}
        onLoadedMetadata={() => {
          if (audioRef.current) setDuration(audioRef.current.duration);
          setIsBuffering(false);
        }}
        onWaiting={() => setIsBuffering(true)}
        onPlaying={() => setIsBuffering(false)}
        onEnded={() => setIsPlaying(false)}
      />

      <div className="flex flex-col md:flex-row items-center gap-6">
        {/* Artwork / Cover */}
        <div 
          onClick={togglePlay}
          className="relative w-full md:w-56 sm:w-64 aspect-square rounded-2xl overflow-hidden cursor-pointer bg-neutral-800 border border-white/15 group-hover:border-canina-blue/50 transition-all flex items-center justify-center shrink-0 shadow-lg"
        >
          <SafeImage
            src={displayCover}
            alt={podcast.title || "کاور پادکست"}
            className="w-full h-full"
            imgClassName={`w-full h-full object-cover transition-transform duration-700 ${isPlaying ? "scale-105" : "scale-100"}`}
          />
          <div className="absolute inset-0 bg-black/40 group-hover:bg-black/20 transition-colors flex items-center justify-center">
            <div className="w-12 h-12 rounded-full bg-canina-blue text-white flex items-center justify-center shadow-xl shadow-canina-blue/50 group-hover:scale-110 active:scale-95 transition-transform">
              {isPlaying ? <Pause className="w-5 h-5 fill-white" /> : <Play className="w-5 h-5 fill-white ml-0.5" />}
            </div>
          </div>
          {isBuffering && (
            <div className="absolute inset-0 bg-black/50 backdrop-blur-2xs flex items-center justify-center">
              <Loader2 className="w-8 h-8 text-white animate-spin" />
            </div>
          )}
        </div>

        {/* Info & Soundcloud Waveform Seeker Controls */}
        <div className="flex-1 w-full text-center md:text-right space-y-3">
          {/* Header Row: Badge & Action buttons */}
          <div className="flex items-center justify-between gap-2 flex-wrap">
            <div className="flex items-center gap-2">
              <span className="text-xs font-black text-cyan-300 bg-cyan-500/20 px-3.5 py-1.5 rounded-full border border-cyan-400/40 shadow-xs flex items-center gap-1.5 backdrop-blur-xs">
                <Headphones className="w-3.5 h-3.5 animate-pulse text-cyan-300" />
                <span>پادکست و تحلیل صوتی بالینی</span>
              </span>
              {podcast.productName && (
                <span className="hidden sm:inline-flex text-xs font-bold text-white/70 items-center gap-1">
                  <Sparkles className="w-3 h-3 text-canina-gold" />
                  <span>{podcast.productName}</span>
                </span>
              )}
            </div>

            <div className="flex items-center gap-1.5">
              <button
                type="button"
                onClick={handleShare}
                className="p-2 rounded-xl bg-white/10 hover:bg-white/20 text-white transition-all cursor-pointer"
                title="اشتراک‌گذاری"
              >
                {isCopied ? <Check className="w-4 h-4 text-emerald-400" /> : <Share2 className="w-4 h-4" />}
              </button>

              <button
                type="button"
                onClick={handleDownload}
                className="p-2 rounded-xl bg-white/10 hover:bg-white/20 text-white transition-all cursor-pointer"
                title="دانلود پادکست"
              >
                <Download className="w-4 h-4" />
              </button>
            </div>
          </div>

          <div>
            <h4 className="text-base sm:text-lg font-black text-white line-clamp-1">
              {podcast.title || "پادکست و بررسی صوتی بالینی مکمل"}
            </h4>
            {(() => {
              const pDesc = podcast.description || "توضیحات صوتی دامپزشک و کادر علمی درباره اثربخشی، مکانیسم اثر و نحوه مصرف دقیق";
              const isLong = pDesc.length > 120;
              return (
                <div className="space-y-1 mt-1">
                  <p className="text-xs text-white/70 font-medium leading-relaxed">
                    {isLong && !isExpandedDesc ? `${pDesc.slice(0, 120)}...` : pDesc}
                  </p>
                  {isLong && (
                    <button
                      type="button"
                      onClick={() => setIsExpandedDesc(prev => !prev)}
                      className="text-cyan-300 hover:text-cyan-200 text-[11px] font-bold inline-flex items-center gap-1 cursor-pointer transition-colors"
                    >
                      <span>{isExpandedDesc ? 'بستن متن' : 'مشاهده متن کامل'}</span>
                      {isExpandedDesc ? <ChevronUp className="w-3.5 h-3.5" /> : <ChevronDown className="w-3.5 h-3.5" />}
                    </button>
                  )}
                </div>
              );
            })()}
          </div>

          {/* Soundcloud-Style Waveform Visualizer & Track */}
          <div className="w-full space-y-1.5 pt-1">
            <div 
              ref={waveformRef}
              onClick={handleWaveformClick}
              className="w-full h-11 flex items-center justify-between gap-[3px] px-2.5 py-1 bg-white/5 hover:bg-white/10 rounded-2xl cursor-pointer transition-all relative overflow-hidden group/wave border border-white/5"
              title="برای رفتن به زمان مورد نظر کلیک کنید"
              dir="ltr"
            >
              {waveformHeights.map((h, i) => {
                const barPercent = (i / (WAVEFORM_BAR_COUNT - 1)) * 100;
                const isPassed = barPercent <= progressPercent;
                return (
                  <div
                    key={i}
                    className="flex-1 flex items-center justify-center h-full"
                  >
                    <div
                      className={`w-full rounded-full transition-all duration-150 ${
                        isPassed 
                          ? "bg-gradient-to-t from-canina-blue to-cyan-400 shadow-xs" 
                          : "bg-white/20 group-hover/wave:bg-white/30"
                      } ${isPlaying && isPassed ? "opacity-100" : "opacity-80"}`}
                      style={{ 
                        height: `${h}%`,
                        transform: isPlaying && isPassed ? "scaleY(1.05)" : "scaleY(1)"
                      }}
                    />
                  </div>
                );
              })}
            </div>

            {/* Time Stamp Row */}
            <div className="flex items-center justify-between text-[11px] font-mono font-bold text-white/60 px-1 dir-ltr" dir="ltr">
              <span>{formatTime(currentTime)}</span>
              <span>{formatTime(duration)}</span>
            </div>
          </div>

          {/* Controls Bottom Bar */}
          <div className="flex items-center justify-between pt-1 flex-wrap gap-2">
            {/* Speed Selector */}
            <div className="relative" ref={rateMenuRef}>
              <button
                type="button"
                onClick={() => setShowRateMenu(!showRateMenu)}
                className="px-2.5 py-1 rounded-xl bg-white/10 hover:bg-white/20 text-white text-xs font-mono font-bold transition-all cursor-pointer flex items-center gap-1 border border-white/10"
                title="سرعت پخش"
              >
                <span>{playbackRate}x</span>
              </button>

              {showRateMenu && (
                <div className="absolute bottom-full right-0 mb-2 bg-neutral-900/95 backdrop-blur-md border border-white/15 rounded-2xl p-1.5 shadow-2xl z-30 flex flex-col gap-1 min-w-[75px]">
                  {PLAYBACK_RATES.map((rate) => (
                    <button
                      key={rate}
                      type="button"
                      onClick={() => handleRateChange(rate)}
                      className={`px-3 py-1 text-xs font-mono font-bold rounded-xl text-center transition-colors cursor-pointer ${
                        playbackRate === rate
                          ? "bg-canina-blue text-white"
                          : "text-white/70 hover:bg-white/10 hover:text-white"
                      }`}
                    >
                      {rate}x
                    </button>
                  ))}
                </div>
              )}
            </div>

            {/* Central Controls: -15s on Left, Play in Center, +15s on Right in RTL */}
            <div className="flex items-center gap-2 sm:gap-3" dir="ltr">
              <button
                type="button"
                onClick={togglePlay}
                className="w-10 h-10 rounded-full bg-canina-blue hover:bg-canina-blue/90 text-white flex items-center justify-center transition-transform hover:scale-105 active:scale-95 cursor-pointer shadow-lg shadow-canina-blue/30 border border-white/10"
                title={isPlaying ? "توقف" : "پخش"}
              >
                {isPlaying ? <Pause className="w-5 h-5 fill-white" /> : <Play className="w-5 h-5 fill-white ml-0.5" />}
              </button>

              {/* -15s */}
              <button
                type="button"
                onClick={() => skipTime(-15)}
                className="px-2.5 py-1.5 text-white/80 hover:text-white rounded-lg hover:bg-white/10 transition-colors cursor-pointer flex items-center gap-1 text-xs font-mono font-bold border border-white/10"
                title="۱۵ ثانیه عقب"
              >
                <RotateCcw className="w-3.5 h-3.5" />
                <span>-15s</span>
              </button>

              {/* +15s */}
              <button
                type="button"
                onClick={() => skipTime(15)}
                className="px-2.5 py-1.5 text-white/80 hover:text-white rounded-lg hover:bg-white/10 transition-colors cursor-pointer flex items-center gap-1 text-xs font-mono font-bold border border-white/10"
                title="۱۵ ثانیه جلو"
              >
                <RotateCw className="w-3.5 h-3.5" />
                <span>+15s</span>
              </button>
            </div>

            {/* Volume Control: Directed towards speaker icon */}
            <div className="flex items-center gap-2" dir="ltr">
              <div className="relative w-16 hidden sm:flex items-center h-4">
                <div className="absolute inset-x-0 h-1.5 bg-white/20 rounded-lg overflow-hidden pointer-events-none">
                  <div 
                    className="h-full bg-canina-blue transition-all"
                    style={{ width: `${volumePercent}%` }}
                  />
                </div>
                <input
                  type="range"
                  min={0}
                  max={1}
                  step={0.05}
                  value={isMuted ? 0 : volume}
                  onChange={handleVolumeChange}
                  className="w-full h-4 opacity-0 absolute inset-0 cursor-pointer z-10"
                />
                <div 
                  className="absolute w-2.5 h-2.5 bg-white rounded-full shadow pointer-events-none -translate-x-1/2"
                  style={{ left: `${volumePercent}%` }}
                />
              </div>
              <button
                type="button"
                onClick={toggleMute}
                className="p-1.5 text-white/80 hover:text-white rounded-lg hover:bg-white/10 transition-colors cursor-pointer"
                title={isMuted ? "صدا وصل" : "بی‌صدا"}
              >
                {isMuted || volume === 0 ? <VolumeX className="w-4 h-4" /> : <Volume2 className="w-4 h-4" />}
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}