import React, { useState, useEffect } from 'react';
import { ChatPanel } from './components/ChatPanel';
import { VoiceControls } from './components/VoiceControls';
import { AvatarView } from './components/AvatarView';
import { Captions } from './components/Captions';
import { Settings } from './components/Settings';
import { useSession } from './hooks/useSession';
import { useConversation } from './hooks/useConversation';
import { useWebRTC } from './hooks/useWebRTC';
import { PostMessageAPI } from './services/postMessage';
import { WidgetConfig } from './types';
import './App.css';

// Default config - can be overridden via postMessage or data attributes
const getConfig = (): WidgetConfig => {
  const script = document.querySelector('script[data-tenant-id]');
  if (script) {
    return {
      tenantId: script.getAttribute('data-tenant-id') || 'default',
      userId: script.getAttribute('data-user-id') || undefined,
      authToken: script.getAttribute('data-auth-token') || undefined,
      apiUrl: script.getAttribute('data-api-url') || undefined,
      avatarEnabled: script.getAttribute('data-avatar-enabled') !== 'false',
    };
  }

  return {
    tenantId: 'default',
    avatarEnabled: true,
  };
};

export const App: React.FC = () => {
  const [config] = useState<WidgetConfig>(getConfig());
  const [showSettings, setShowSettings] = useState(false);
  const [showCaptions, setShowCaptions] = useState(true);
  const [avatarEnabled, setAvatarEnabled] = useState(config.avatarEnabled ?? true);
  const [volume, setVolume] = useState(100);
  const [isMuted, setIsMuted] = useState(false);
  const [captionText, setCaptionText] = useState('');

  const postMessage = new PostMessageAPI();
  const { session, loading, error, createSession, endSession } = useSession(config);
  const {
    messages,
    isListening,
    isSpeaking,
    setIsListening,
    setIsSpeaking,
    sendMessage,
    receiveMessage,
  } = useConversation();
  const { isConnected, remoteStream, initializeWebRTC, closeWebRTC } = useWebRTC();

  // Initialize session on mount
  useEffect(() => {
    createSession();
  }, []);

  // Initialize WebRTC when session is ready
  useEffect(() => {
    if (session && !isConnected) {
      initializeWebRTC();
    }
  }, [session, isConnected]);

  // Cleanup on unmount
  useEffect(() => {
    return () => {
      endSession();
      closeWebRTC();
    };
  }, []);

  // Send ready event
  useEffect(() => {
    if (session) {
      postMessage.ready();
      postMessage.sessionStarted(session.sessionId);
    }
  }, [session]);

  // Listen for messages from host
  useEffect(() => {
    const unsubscribe = postMessage.on('open', () => {
      // Widget opened
    });

    return unsubscribe;
  }, []);

  const handleSendMessage = (message: string) => {
    sendMessage(message);
    // TODO: Send to backend via WebRTC or WebSocket
  };

  const handlePushToTalk = () => {
    setIsListening(true);
    // TODO: Start audio capture
  };

  const handleHandsFree = () => {
    setIsListening(true);
    // TODO: Enable continuous listening
  };

  const handleToggleMute = () => {
    setIsMuted(!isMuted);
    // TODO: Mute/unmute audio
  };

  if (loading) {
    return (
      <div className="widget-container loading">
        <div className="loading-spinner">Loading...</div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="widget-container error">
        <div className="error-message">Error: {error}</div>
        <button onClick={createSession}>Retry</button>
      </div>
    );
  }

  return (
    <div className="widget-container">
      <div className="widget-header">
        <h1>Virtual Banker</h1>
        <button
          onClick={() => setShowSettings(true)}
          className="settings-button"
          aria-label="Settings"
        >
          ⚙️
        </button>
      </div>

      <div className="widget-content">
        {avatarEnabled && (
          <div className="widget-avatar-section">
            <AvatarView
              enabled={avatarEnabled}
              videoStream={remoteStream || undefined}
              onToggle={() => setAvatarEnabled(false)}
            />
          </div>
        )}

        <div className="widget-chat-section">
          <ChatPanel
            messages={messages}
            onSendMessage={handleSendMessage}
            isListening={isListening}
            isSpeaking={isSpeaking}
            showCaptions={showCaptions}
            onToggleCaptions={() => setShowCaptions(!showCaptions)}
          />
        </div>
      </div>

      <VoiceControls
        onPushToTalk={handlePushToTalk}
        onHandsFree={handleHandsFree}
        isListening={isListening}
        isMuted={isMuted}
        onToggleMute={handleToggleMute}
        volume={volume}
        onVolumeChange={setVolume}
      />

      <Captions text={captionText} visible={showCaptions} />

      {showSettings && (
        <Settings
          showCaptions={showCaptions}
          onToggleCaptions={() => setShowCaptions(!showCaptions)}
          avatarEnabled={avatarEnabled}
          onToggleAvatar={() => setAvatarEnabled(!avatarEnabled)}
          onClose={() => setShowSettings(false)}
        />
      )}
    </div>
  );
};