import AgoraRTC from 'agora-rtc-sdk-ng';

class AgoraService {
  constructor() {
    this.client = null;
    this.localAudioTrack = null;
    this.uid = null;
    this.isJoined = false;
    this.remoteUsers = {};
    this.volumeIndicator = null;
    this.vadEnabled = true;
    this.appid = '01a1debc964a4c6a8df1de2a6ce7aa4d';
    this.token = '007eJxTYHi+XWtqBkPmn71LGvdmPds7sfiQfomBxpt3XMfOC53fcjVegcHAMNEwJTUp2dLMJNEk2SzRIiUNyDdKNEtONU9MNEkpibmZ3hDIyPDYXo2JkQECQXwRhuT8vLLETCBZnJ+TGm9oYmluYMDAAACcPigI';
    this.channel = 'convaiconsole_149700';
    this.vadParams = {
      interruptDurationMs: 160,
      prefixPaddingMs: 300,
      silenceDurationMs: 480,
      threshold: 0.5
    };
  }

  /**
   * Initialize the Agora RTC client
   */
  init() {
    this.client = AgoraRTC.createClient({ mode: 'rtc', codec: 'vp8' });
    this.setupEventListeners();
    return this.client;
  }

  /**
   * Set up event listeners for the Agora client
   */
  setupEventListeners() {
    this.client.on('user-published', async (user, mediaType) => {
      await this.client.subscribe(user, mediaType);
      if (mediaType === 'audio') {
        user.audioTrack.play();
        this.remoteUsers[user.uid] = user;
      }
    });

    this.client.on('user-unpublished', (user) => {
      if (user.audioTrack) {
        user.audioTrack.stop();
      }
      delete this.remoteUsers[user.uid];
    });

    this.client.on('user-left', (user) => {
      delete this.remoteUsers[user.uid];
    });

    this.client.on('volume-indicator', (volumes) => {
      volumes.forEach((volume) => {
        // Handle volume indicator
        if (volume.uid === this.uid) {
          // Local user's volume
          const event = new CustomEvent('local-volume', { 
            detail: { level: volume.level } 
          });
          window.dispatchEvent(event);
        }
      });
    });
  }

  /**
   * Join a channel with the given token and channel name
   * @param {string} token - The token for authentication
   * @param {string} channel - The channel name to join
   * @param {string} uid - The user ID (optional)
   */
  async join(agent_id, create_ts, status, uid = null) {
    try {
      // Join the channel
      this.uid = await this.client.join(this.appid, this.channel, this.token, uid);

      console.log("successful! this.uid is ", this.uid);

      this.isJoined = true;
      
      // Create and publish local audio track
      this.localAudioTrack = await AgoraRTC.createMicrophoneAudioTrack({
        AEC: true,
        AGC: true,
        ANS: true
      });
      
      // Enable VAD (Voice Activity Detection)
      if (this.vadEnabled && this.localAudioTrack.setVADMode) {
        this.localAudioTrack.setVADMode(true, this.vadParams);
      }
      
      // Publish local audio track
      await this.client.publish([this.localAudioTrack]);
      
      // Enable volume indicator
      this.client.enableAudioVolumeIndicator();

      console.log("status:", this.status);

      return true;
    } catch (error) {
      console.error('Error joining channel:', error);
      return false;
    }
  }

  /**
   * Leave the channel and release resources
   */
  async leave() {
    if (this.localAudioTrack) {
      this.localAudioTrack.close();
      this.localAudioTrack = null;
    }
    
    await this.client.leave();
    this.isJoined = false;
    this.remoteUsers = {};
  }

  /**
   * Mute or unmute the local audio
   * @param {boolean} mute - Whether to mute the audio
   */
  muteAudio(mute) {
    if (this.localAudioTrack) {
      if (mute) {
        this.localAudioTrack.setEnabled(false);
      } else {
        this.localAudioTrack.setEnabled(true);
      }
    }
  }

  /**
   * Check if the local audio is muted
   * @returns {boolean} - Whether the audio is muted
   */
  isAudioMuted() {
    return this.localAudioTrack ? !this.localAudioTrack.enabled : true;
  }

  /**
   * Set the VAD parameters
   * @param {Object} params - The VAD parameters
   */
  setVADParams(params) {
    this.vadParams = { ...this.vadParams, ...params };
    if (this.localAudioTrack && this.localAudioTrack.setVADMode) {
      this.localAudioTrack.setVADMode(this.vadEnabled, this.vadParams);
    }
  }

  /**
   * Enable or disable VAD
   * @param {boolean} enabled - Whether to enable VAD
   */
  enableVAD(enabled) {
    this.vadEnabled = enabled;
    if (this.localAudioTrack && this.localAudioTrack.setVADMode) {
      this.localAudioTrack.setVADMode(enabled, this.vadParams);
    }
  }
}

export default new AgoraService();