import { connect, Room, LocalVideoTrack, LocalAudioTrack, RemoteParticipant, LocalParticipant } from 'twilio-video';
import { twilioConfig, videoOptions, RoomType, TOKEN_SERVER_URL } from '../config/twilio';

export interface TwilioToken {
  token: string;
  identity: string;
  roomName: string;
}

export interface VideoCallOptions {
  roomName: string;
  identity: string;
  roomType?: RoomType;
  audio?: boolean;
  video?: boolean;
}

export interface ParticipantInfo {
  identity: string;
  sid: string;
  isLocal: boolean;
  audioEnabled: boolean;
  videoEnabled: boolean;
}

export class TwilioService {
  private room: Room | null = null;
  private localVideoTrack: LocalVideoTrack | null = null;
  private localAudioTrack: LocalAudioTrack | null = null;

  // 获取访问令牌
  async getAccessToken(identity: string, roomName: string): Promise<string> {
    try {
      const response = await fetch(`${TOKEN_SERVER_URL}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          identity,
          roomName,
          apiKey: twilioConfig.apiKey,
          apiSecret: twilioConfig.apiSecret,
        }),
      });

      if (!response.ok) {
        throw new Error(`Token request failed: ${response.statusText}`);
      }

      const data = await response.json();
      return data.token;
    } catch (error) {
      console.error('Error getting access token:', error);
      throw error;
    }
  }

  // 连接到视频房间
  async connectToRoom(options: VideoCallOptions): Promise<Room> {
    try {
      const token = await this.getAccessToken(options.identity, options.roomName);
      
      const connectOptions = {
        ...videoOptions,
        name: options.roomName,
        audio: options.audio ?? true,
        video: options.video ?? true,
      };

      this.room = await connect(token, connectOptions);
      
      // 设置事件监听器
      this.setupRoomEventListeners();
      
      return this.room;
    } catch (error) {
      console.error('Error connecting to room:', error);
      throw error;
    }
  }

  // 断开连接
  disconnect(): void {
    if (this.room) {
      this.room.disconnect();
      this.room = null;
    }
    
    if (this.localVideoTrack) {
      this.localVideoTrack.stop();
      this.localVideoTrack = null;
    }
    
    if (this.localAudioTrack) {
      this.localAudioTrack.stop();
      this.localAudioTrack = null;
    }
  }

  // 切换音频
  toggleAudio(): boolean {
    if (this.room && this.room.localParticipant) {
      const audioTrack = Array.from(this.room.localParticipant.audioTracks.values())[0];
      if (audioTrack) {
        if (audioTrack.track.isEnabled) {
          audioTrack.track.disable();
        } else {
          audioTrack.track.enable();
        }
        return audioTrack.track.isEnabled;
      }
    }
    return false;
  }

  // 切换视频
  toggleVideo(): boolean {
    if (this.room && this.room.localParticipant) {
      const videoTrack = Array.from(this.room.localParticipant.videoTracks.values())[0];
      if (videoTrack) {
        if (videoTrack.track.isEnabled) {
          videoTrack.track.disable();
        } else {
          videoTrack.track.enable();
        }
        return videoTrack.track.isEnabled;
      }
    }
    return false;
  }

  // 获取参与者信息
  getParticipants(): ParticipantInfo[] {
    if (!this.room) return [];

    const participants: ParticipantInfo[] = [];

    // 本地参与者
    const localParticipant = this.room.localParticipant;
    participants.push({
      identity: localParticipant.identity,
      sid: localParticipant.sid,
      isLocal: true,
      audioEnabled: Array.from(localParticipant.audioTracks.values()).some(track => track.track.isEnabled),
      videoEnabled: Array.from(localParticipant.videoTracks.values()).some(track => track.track.isEnabled),
    });

    // 远程参与者
    this.room.participants.forEach((participant: RemoteParticipant) => {
      participants.push({
        identity: participant.identity,
        sid: participant.sid,
        isLocal: false,
        audioEnabled: Array.from(participant.audioTracks.values()).some(track => track.track && track.track.isEnabled),
        videoEnabled: Array.from(participant.videoTracks.values()).some(track => track.track && track.track.isEnabled),
      });
    });

    return participants;
  }

  // 获取当前房间
  getCurrentRoom(): Room | null {
    return this.room;
  }

  // 设置房间事件监听器
  private setupRoomEventListeners(): void {
    if (!this.room) return;

    this.room.on('participantConnected', (participant: RemoteParticipant) => {
      console.log('Participant connected:', participant.identity);
    });

    this.room.on('participantDisconnected', (participant: RemoteParticipant) => {
      console.log('Participant disconnected:', participant.identity);
    });

    this.room.on('disconnected', (room: Room) => {
      console.log('Disconnected from room:', room.name);
    });

    this.room.on('reconnecting', (error: any) => {
      console.log('Reconnecting to room...', error);
    });

    this.room.on('reconnected', () => {
      console.log('Reconnected to room');
    });
  }
}

export const twilioService = new TwilioService();