// src/pages/VoiceLabPage.tsx
import React, { useState } from 'react';
import { generateSpeechFromText, startVoiceSession } from '../services/aiApiClient';
import { logger } from '../services/logger.client';
import { notifyError } from '../services/notificationService';
import { LoadingSpinner } from '../components/LoadingSpinner';
import { SpeakerWaveIcon } from '../components/icons/SpeakerWaveIcon';
import { MicrophoneIcon } from '../components/icons/MicrophoneIcon';

export const VoiceLabPage: React.FC = () => {
  const [textToSpeak, setTextToSpeak] = useState(
    'Hello! This is a test of the text-to-speech generation.',
  );
  const [isGeneratingSpeech, setIsGeneratingSpeech] = useState(false);
  const [audioPlayer, setAudioPlayer] = useState<HTMLAudioElement | null>(null);

  // Debug log for rendering
  logger.debug({ hasAudioPlayer: !!audioPlayer }, '[VoiceLabPage] Render');

  const handleGenerateSpeech = async () => {
    logger.debug('[VoiceLabPage] handleGenerateSpeech triggered');
    if (!textToSpeak.trim()) {
      notifyError('Please enter some text to generate speech.');
      return;
    }
    setIsGeneratingSpeech(true);
    try {
      logger.debug('[VoiceLabPage] Calling generateSpeechFromText');
      const response = await generateSpeechFromText(textToSpeak);
      const base64Audio = await response.json(); // Extract the base64 audio string from the response
      logger.debug({ audioLength: base64Audio?.length }, '[VoiceLabPage] Response JSON received');

      if (base64Audio) {
        const audioSrc = `data:audio/mpeg;base64,${base64Audio}`;
        logger.debug('[VoiceLabPage] Creating new Audio()');
        const audio = new Audio(audioSrc);
        logger.debug('[VoiceLabPage] Audio created');

        logger.debug('[VoiceLabPage] Calling setAudioPlayer');
        setAudioPlayer(audio);

        logger.debug('[VoiceLabPage] Calling audio.play()');
        await audio.play();
        logger.debug('[VoiceLabPage] audio.play() resolved');
      } else {
        logger.warn('[VoiceLabPage] base64Audio was falsy');
        notifyError('The AI did not return any audio data.');
      }
    } catch (error) {
      logger.error({ err: error }, '[VoiceLabPage] Failed to generate speech');
      const errorMessage = error instanceof Error ? error.message : 'An unknown error occurred.';
      notifyError(`Speech generation failed: ${errorMessage}`);
    } finally {
      logger.debug('[VoiceLabPage] finally block - setting isGeneratingSpeech false');
      setIsGeneratingSpeech(false);
    }
  };

  const handleStartVoiceSession = () => {
    try {
      // This function is currently a stub and will throw an error.
      // This is the placeholder for the future real-time voice implementation.
      startVoiceSession({
        onmessage: (message) => {
          logger.info('Received voice session message:', message);
        },
      });
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'An unknown error occurred.';
      logger.error({ err: error }, 'Failed to start voice session:');
      notifyError(`Could not start voice session: ${errorMessage}`);
    }
  };

  return (
    <div className="p-4 sm:p-6 lg:p-8 bg-gray-50 dark:bg-gray-900 min-h-screen">
      <div className="max-w-4xl mx-auto">
        <h1 className="text-3xl font-bold text-gray-900 dark:text-white mb-4">Admin Voice Lab</h1>
        <p className="text-gray-600 dark:text-gray-400 mb-8">
          This page is for testing and developing voice-related AI features.
        </p>

        {/* Text-to-Speech Section */}
        <div className="bg-white dark:bg-gray-800 p-6 rounded-lg shadow-md mb-8">
          <h2 className="text-xl font-semibold mb-4 flex items-center">
            <SpeakerWaveIcon className="w-6 h-6 mr-3 text-brand-primary" />
            Text-to-Speech Generation
          </h2>
          <div className="space-y-4">
            <div>
              <label
                htmlFor="text-to-speak"
                className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1"
              >
                Text to Generate
              </label>
              <textarea
                id="text-to-speak"
                rows={3}
                className="w-full p-2 border border-gray-300 dark:border-gray-600 rounded-md dark:bg-gray-700"
                value={textToSpeak}
                onChange={(e) => setTextToSpeak(e.target.value)}
              />
            </div>
            <div className="flex items-center space-x-4">
              <button
                onClick={handleGenerateSpeech}
                disabled={isGeneratingSpeech}
                className="bg-brand-secondary hover:bg-brand-dark text-white font-bold py-2 px-4 rounded-lg flex items-center justify-center disabled:bg-gray-400"
              >
                {isGeneratingSpeech ? <LoadingSpinner /> : 'Generate & Play'}
              </button>
              {audioPlayer && (
                <button
                  data-testid="replay-button"
                  onClick={() => audioPlayer.play()}
                  className="bg-gray-200 dark:bg-gray-700 hover:bg-gray-300 dark:hover:bg-gray-600 font-bold py-2 px-4 rounded-lg"
                >
                  Replay
                </button>
              )}
            </div>
          </div>
        </div>

        {/* Real-time Voice Session Section */}
        <div className="bg-white dark:bg-gray-800 p-6 rounded-lg shadow-md border-2 border-dashed border-yellow-400 dark:border-yellow-500">
          <h2 className="text-xl font-semibold mb-4 flex items-center">
            <MicrophoneIcon className="w-6 h-6 mr-3 text-yellow-500" />
            Real-time Voice Session (Future Feature)
          </h2>
          <p className="text-gray-600 dark:text-gray-400 mb-4">
            This feature will enable real-time, two-way voice conversations. It requires a backend
            WebSocket proxy to be implemented.
          </p>
          <button
            onClick={handleStartVoiceSession}
            className="bg-yellow-500 hover:bg-yellow-600 text-white font-bold py-2 px-4 rounded-lg"
          >
            Attempt to Start Session (Will Error)
          </button>
        </div>
      </div>
    </div>
  );
};