import React, { useState, useRef, useEffect } from 'react';

interface CustomVoiceProps {
  onStart: (src: File, ref: File) => void;
  isLoading: boolean;
}

const CustomVoice: React.FC<CustomVoiceProps> = ({ onStart, isLoading }) => {
  const [srcFile, setSrcFile] = useState<File | null>(null);
  const [refFile, setRefFile] = useState<File | null>(null);
  
  // Audio Playback State
  const [playingType, setPlayingType] = useState<'src' | 'ref' | null>(null);
  const audioRef = useRef<HTMLAudioElement | null>(null);
  
  const srcInputRef = useRef<HTMLInputElement>(null);
  const refInputRef = useRef<HTMLInputElement>(null);

  // Cleanup audio on unmount
  useEffect(() => {
    return () => {
      if (audioRef.current) {
        audioRef.current.pause();
        audioRef.current = null;
      }
    };
  }, []);

  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>, type: 'src' | 'ref') => {
    if (e.target.files && e.target.files[0]) {
      // Stop playing if currently playing the file being changed
      if (playingType === type && audioRef.current) {
         audioRef.current.pause();
         setPlayingType(null);
      }
      
      if (type === 'src') setSrcFile(e.target.files[0]);
      else setRefFile(e.target.files[0]);
    }
  };

  const togglePreview = (e: React.MouseEvent, type: 'src' | 'ref') => {
    e.stopPropagation(); // Prevent opening file dialog
    
    const file = type === 'src' ? srcFile : refFile;
    if (!file) return;

    // If clicking the currently playing type, stop it
    if (playingType === type) {
        if (audioRef.current) {
            audioRef.current.pause();
            audioRef.current = null;
        }
        setPlayingType(null);
        return;
    }

    // Stop any other audio
    if (audioRef.current) {
        audioRef.current.pause();
    }

    // Create new audio
    const url = URL.createObjectURL(file);
    const audio = new Audio(url);
    audioRef.current = audio;

    audio.onended = () => {
        setPlayingType(null);
        URL.revokeObjectURL(url);
    };

    audio.onerror = () => {
        alert("خطا در پخش فایل");
        setPlayingType(null);
    };

    audio.play();
    setPlayingType(type);
  };

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (srcFile && refFile) {
      if (audioRef.current) {
          audioRef.current.pause();
          setPlayingType(null);
      }
      onStart(srcFile, refFile);
    }
  };

  return (
    <div className="animate-[fadeIn_0.5s_ease-out]">
      <div className="text-center mb-8">
        <div className="w-16 h-16 bg-gradient-to-tr from-blue-500 to-purple-600 rounded-2xl mx-auto mb-4 flex items-center justify-center shadow-lg shadow-purple-500/20 rotate-3 transform hover:rotate-6 transition-transform">
          <i className="fas fa-sliders-h text-2xl text-white"></i>
        </div>
        <h2 className="text-2xl font-black text-gray-800 mb-2">استودیو ساخت صدای اختصاصی</h2>
        <p className="text-gray-700 text-sm font-bold mb-2 px-4 leading-relaxed">
          با داشتن یک نمونه صدا هر صدایی رو به همون صدا تبدیل کنید
        </p>
        <p className="text-gray-500 text-xs px-6 leading-relaxed">
          برای شبیه‌سازی دقیق، صدای خود و صدای هدف را با کیفیت بالا بارگذاری کنید.
        </p>
      </div>

      <form onSubmit={handleSubmit} className="space-y-6 px-2">
        
        {/* Source File */}
        <div 
          onClick={() => srcInputRef.current?.click()}
          className={`relative overflow-hidden rounded-3xl border-2 border-dashed p-6 transition-all duration-300 active:scale-95 cursor-pointer
            ${srcFile ? 'border-primary bg-blue-50/50' : 'border-gray-200 bg-white hover:bg-gray-50'}`}
        >
          <input 
            type="file" 
            ref={srcInputRef} 
            hidden 
            accept="audio/*" 
            onChange={(e) => handleFileChange(e, 'src')} 
          />
          <div className="flex items-center gap-4">
            
            <button
                type="button"
                onClick={(e) => {
                    if (srcFile) togglePreview(e, 'src');
                }}
                className={`w-12 h-12 rounded-full flex items-center justify-center flex-shrink-0 transition-all duration-300 relative outline-none
                  ${srcFile 
                    ? 'bg-primary text-white shadow-lg shadow-indigo-500/30 hover:scale-110 z-10' 
                    : 'bg-gray-100 text-gray-400'}`}
            >
               {srcFile ? (
                   playingType === 'src' ? (
                       <>
                         <span className="absolute inset-0 rounded-full bg-white/30 animate-ping"></span>
                         <i className="fas fa-stop text-sm relative z-10"></i>
                       </>
                   ) : (
                       <i className="fas fa-play ml-1 text-sm"></i>
                   )
               ) : (
                   <i className="fas fa-microphone text-xl"></i>
               )}
            </button>

            <div className="text-right flex-1">
              <h6 className="font-bold text-gray-700 text-sm">صدای ورودی (ویس شما)</h6>
              <p className="text-xs text-gray-400 mt-1 truncate">
                {srcFile ? srcFile.name : 'برای انتخاب ضربه بزنید'}
              </p>
            </div>
            {srcFile && <i className="fas fa-check-circle text-primary text-xl"></i>}
          </div>
        </div>

        {/* Reference File */}
        <div 
          onClick={() => refInputRef.current?.click()}
          className={`relative overflow-hidden rounded-3xl border-2 border-dashed p-6 transition-all duration-300 active:scale-95 cursor-pointer
            ${refFile ? 'border-secondary bg-purple-50/50' : 'border-gray-200 bg-white hover:bg-gray-50'}`}
        >
          <input 
            type="file" 
            ref={refInputRef} 
            hidden 
            accept="audio/*" 
            onChange={(e) => handleFileChange(e, 'ref')} 
          />
          <div className="flex items-center gap-4">
            
            <button
                type="button"
                onClick={(e) => {
                    if (refFile) togglePreview(e, 'ref');
                }}
                className={`w-12 h-12 rounded-full flex items-center justify-center flex-shrink-0 transition-all duration-300 relative outline-none
                  ${refFile 
                    ? 'bg-secondary text-white shadow-lg shadow-purple-500/30 hover:scale-110 z-10' 
                    : 'bg-gray-100 text-gray-400'}`}
            >
              {refFile ? (
                 playingType === 'ref' ? (
                    <>
                        <span className="absolute inset-0 rounded-full bg-white/30 animate-ping"></span>
                        <i className="fas fa-stop text-sm relative z-10"></i>
                    </>
                 ) : (
                    <i className="fas fa-play ml-1 text-sm"></i>
                 )
              ) : (
                  <i className="fas fa-music text-xl"></i>
              )}
            </button>

            <div className="text-right flex-1">
              <h6 className="font-bold text-gray-700 text-sm">صدای الگو (رفرنس)</h6>
              <p className="text-xs text-gray-400 mt-1 truncate">
                {refFile ? refFile.name : 'برای انتخاب ضربه بزنید'}
              </p>
            </div>
            {refFile && <i className="fas fa-check-circle text-secondary text-xl"></i>}
          </div>
        </div>

        <button
          type="submit"
          disabled={!srcFile || !refFile || isLoading}
          className={`w-full py-4 rounded-2xl font-bold text-white shadow-xl shadow-purple-500/20 transition-all transform active:scale-95
            ${(!srcFile || !refFile || isLoading) 
              ? 'bg-gray-300 cursor-not-allowed shadow-none grayscale' 
              : 'bg-gradient-to-r from-blue-600 to-purple-600'}`}
        >
          {isLoading ? (
            <span className="flex items-center justify-center gap-2">
              <i className="fas fa-circle-notch fa-spin"></i> در حال پردازش...
            </span>
          ) : (
            'شروع پردازش'
          )}
        </button>

        {/* Enhanced Tips Section - Amber Style (Right Aligned per Screenshot) */}
        <div className="relative group overflow-hidden rounded-[2.5rem] p-6 transition-all duration-500 hover:shadow-2xl hover:shadow-amber-200/50 border border-amber-100/40">
          {/* Animated Background Layers */}
          <div className="absolute inset-0 bg-gradient-to-br from-amber-50/95 via-orange-50/90 to-amber-100/95 backdrop-blur-md -z-10"></div>
          <div className="absolute top-0 left-0 w-full h-full bg-gradient-to-r from-transparent via-white/50 to-transparent -translate-x-full animate-[shimmer_4s_infinite] -z-10"></div>
          <div className="absolute -bottom-12 -right-12 w-40 h-40 bg-amber-200/20 rounded-full blur-3xl group-hover:bg-amber-300/30 transition-colors duration-1000"></div>

          <div className="space-y-6 relative z-10">
            {/* Tip 1: Main Instructions (As per screenshot) */}
            <div className="flex gap-4 items-start">
              {/* Animated Icon Container 1 (Lightbulb) */}
              <div className="relative flex-shrink-0">
                 <div className="absolute inset-0 bg-amber-400 blur-md opacity-30 rounded-full animate-pulse"></div>
                 <div className="w-10 h-10 bg-white rounded-2xl shadow-sm border border-amber-100 flex items-center justify-center relative transform group-hover:scale-110 transition-transform">
                    <i className="fas fa-lightbulb text-amber-500 text-lg animate-[bounce_3s_infinite]"></i>
                    <span className="absolute -top-1 -right-1 flex h-2.5 w-2.5">
                      <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-amber-400 opacity-75"></span>
                      <span className="relative inline-flex rounded-full h-2.5 w-2.5 bg-amber-500 border border-white"></span>
                    </span>
                 </div>
              </div>

              <div className="text-right flex-1">
                <h5 className="text-amber-950 font-black text-sm mb-2">
                  راهنمای هوشمند
                </h5>
                <p className="text-[11.5px] text-amber-900 leading-[1.8] font-medium opacity-95">
                  در قسمت <span className="font-black text-amber-950 underline decoration-amber-300/60 decoration-4 underline-offset-4">صدای ورودی</span> صدای خودتان و در قسمت <span className="font-black text-amber-950 underline decoration-amber-300/60 decoration-4 underline-offset-4">صدای الگو</span> صدای هدف را بارگذاری کنید؛ هوش مصنوعی صدای شما را دقیقاً به صدای الگو تبدیل می‌کند.
                </p>
              </div>
            </div>

            {/* Tip 2: Time Recommendation (Updated Text per user request) */}
            <div className="flex gap-4 items-start border-t border-amber-200/40 pt-5">
              {/* Animated Icon Container 2 (Stopwatch - Same Size) */}
              <div className="relative flex-shrink-0">
                 <div className="absolute inset-0 bg-amber-400 blur-md opacity-20 rounded-full"></div>
                 <div className="w-10 h-10 bg-white rounded-2xl shadow-sm border border-amber-100 flex items-center justify-center relative transform group-hover:rotate-12 transition-transform">
                    <i className="fas fa-stopwatch text-amber-600 text-lg"></i>
                    <span className="absolute -bottom-1 -left-1 flex h-2 w-2">
                      <span className="relative inline-flex rounded-full h-2 w-2 bg-orange-400 opacity-60"></span>
                    </span>
                 </div>
              </div>

              <div className="text-right flex-1 pt-1">
                <p className="text-[11px] text-amber-950 font-bold leading-relaxed">
                  نکته: بهترین حالت این است که صدای مدل بین <span className="text-sm font-black text-amber-600 underline decoration-amber-300/60 decoration-4 underline-offset-4 mx-1">۳ تا ۹</span> ثانیه بدون نویز باشه. کیفیت صدای خروجی به کیفیت صدای مدل که اضافه میکنید بستگی داره.
                </p>
              </div>
            </div>
          </div>
        </div>
      </form>
      
      <style>{`
        @keyframes shimmer {
          100% { transform: translateX(100%); }
        }
      `}</style>
    </div>
  );
};

export default CustomVoice;