import { useState, useEffect, useRef } from 'react';
import { useParams } from 'react-router';
// @ts-types="../../../share/aliyun-rtc-sdk.d.ts"
import AliRtcEngine, { AliRtcSubscribeState, AliRtcVideoTrack } from 'aliyun-rtc-sdk';
import { toast } from 'react-toastify';

export enum Role {
  Teacher = 'admin',
  Student = 'student'
}

// 从SDK中提取需要的类型和枚举
type ImEngine = InstanceType<typeof AliVCInteraction.ImEngine>;
type ImGroupManager = AliVCInteraction.AliVCIMGroupManager;
type ImMessageManager = AliVCInteraction.AliVCIMMessageManager;
type ImLogLevel = AliVCInteraction.ImLogLevel;
type ImMessageLevel = AliVCInteraction.ImMessageLevel;
const { ERROR } = AliVCInteraction.ImLogLevel;
const { NORMAL, HIGH } = AliVCInteraction.ImMessageLevel;

interface ImUser {
  userId: string;
  userExtension?: string;
}

interface ImGroupMessage {
  groupId: string;
  type: number;
  data: string;
  sender?: ImUser;
  timestamp?: number;
}

// 互动消息类型
enum InteractionAction {
  HandUp = 'hand_up',
  CancelHandUp = 'cancel_hand_up',
  AnswerHandUp = 'answer_hand_up'
}

interface InteractionMessage {
  action: InteractionAction;
  studentId: string;
  studentName?: string;
  timestamp?: number;
  question?: string;
}

interface HandUpRequest {
  studentId: string;
  studentName?: string;
  timestamp: number;
  question?: string;
}

interface Question {
  studentId: string;
  studentName?: string;
  question: string;
  timestamp: number;
}

export enum ClassStatus {
  NOT_STARTED = 'not_started',
  IN_PROGRESS = 'in_progress',
  ENDED = 'ended'
}

// 配置信息
const IM_APP_ID = '4c2ab5e1b1b0';
const IM_APP_KEY = '314bb5eee5b623549e8a41574ba3ff32';
const IM_APP_SIGN = 'H4sIAAAAAAAE/wCQAG//zguHB+lYCilkv7diSkk4GmcvLuds+InRu9vFOFebMwm/jEgsK5bBT85Z0owObMxG58uXHyPFlPEBEDQm9FswNJ+KmX0VDYkcfdPPWkafA6Hc0B6F+p5De9yJfPEfHzwo/DHMaygbHfLmBgUtmKveq421sJr/gNBz9D04Ewsg39us+ao0NegzLt7xtXvFXXXJAAAA//8BAAD//yoav6aQAAAA';
const RTC_APP_ID = 'a5842c2a-d94a-43be-81de-1fdb712476e1';
const RTC_APP_KEY = 'b71d65f4f84c450f6f058f4ad507bd42';

export const useClassroom = () => {
  // 状态管理
  const [userId, setUserId] = useState<string>('');
  const [isCameraOn, setIsCameraOn] = useState<boolean>(false);
  const [isAudioOn, setIsAudioOn] = useState<boolean>(false);
  const [isScreenSharing, setIsScreenSharing] = useState<boolean>(false);
  const [className, setClassName] = useState<string>('');
  const [role, setRole] = useState<Role | undefined>();
  const [classId, setClassId] = useState<string>('');
  const [isLoggedIn, setIsLoggedIn] = useState<boolean>(false);
  const [isJoinedClass, setIsJoinedClass] = useState<boolean>(false);
  const [msgText, setMsgText] = useState<string>('');
  const [messageList, setMessageList] = useState<string[]>([]);
  const [errorMessage, setErrorMessage] = useState<string>('');
  const [classStatus, setClassStatus] = useState<ClassStatus>(ClassStatus.NOT_STARTED);
  const [handUpList, setHandUpList] = useState<HandUpRequest[]>([]);
  const [questions, setQuestions] = useState<Question[]>([]);
  const [students, setStudents] = useState<Array<{id: string, name: string}>>([]);
  const [shareLink, setShareLink] = useState<string>('');

  // SDK实例
  const imEngine = useRef<ImEngine | null>(null);
  const imGroupManager = useRef<ImGroupManager | null>(null);
  const imMessageManager = useRef<ImMessageManager | null>(null);
  const aliRtcEngine = useRef<AliRtcEngine | null>(null);
  const remoteVideoElMap = useRef<Record<string, HTMLVideoElement>>({});
  const remoteVideoContainer = useRef<HTMLDivElement>(null);

  // 辅助函数
  const showMessage = (text: string): void => {
    setMessageList((prevMessageList) => [...prevMessageList, text])
  };

  const showToast = (type: 'info' | 'success' | 'error', message: string): void => {
    toast[type](message);
  };

  const hex = (buffer: ArrayBuffer): string => {
    const hexCodes = [];
    const view = new DataView(buffer);
    for (let i = 0; i < view.byteLength; i += 4) {
      const value = view.getUint32(i);
      const stringValue = value.toString(16);
      const padding = '00000000';
      const paddedValue = (padding + stringValue).slice(-padding.length);
      hexCodes.push(paddedValue);
    }
    return hexCodes.join('');
  };

  const generateToken = async (
    appId: string,
    appKey: string,
    channelId: string,
    userId: string,
    timestamp: number
  ): Promise<string> => {
    const encoder = new TextEncoder();
    const data = encoder.encode(`${appId}${appKey}${channelId}${userId}${timestamp}`);
    const hash = await crypto.subtle.digest('SHA-256', data);
    return hex(hash);
  };

  const generateImToken = async (userId: string, role: string): Promise<string> => {
    const nonce = 'AK_4';
    const timestamp = Math.floor(Date.now() / 1000) + 3600 * 3;
    const pendingShaStr = `${IM_APP_ID}${IM_APP_KEY}${userId}${nonce}${timestamp}${role}`;
    const encoder = new TextEncoder();
    const data = encoder.encode(pendingShaStr);
    const hash = await crypto.subtle.digest('SHA-256', data);
    return hex(hash);
  };

  // 事件监听函数
  const listenImEvents = (): void => {
    if (!imEngine.current) return;    
    if (!role) return;    

    imEngine.current.on('connectsuccess', () => {
      showMessage('IM连接成功');
    });

    imEngine.current.on('disconnect', async (code: number) => {
      showMessage(`IM断开连接: ${code}`);
      // 自动重连
      try {
        const imToken = await generateImToken(userId, role);
        await imEngine.current!.login({
          user: {
            userId,
            userExtension: '{}'
          },
          userAuth: {
            nonce: 'AK_4',
            timestamp: Math.floor(Date.now() / 1000) + 3600 * 3,
            token: imToken,
            role
          }
        });
        showMessage('IM自动重连成功');
      } catch (err: unknown) {
        const error = err as Error;
        showMessage(`IM自动重连失败: ${error.message}`);
      }
    });
  };

  const listenGroupEvents = (): void => {
    if (!imGroupManager.current) return;

    imGroupManager.current.on('memberchange', (groupId: string, memberCount: number, joinUsers: ImUser[], leaveUsers: ImUser[]) => {
      showMessage(`成员变更: 加入${joinUsers.length}人, 离开${leaveUsers.length}人`);
    });
  };

  const listenMessageEvents = (): void => {
    if (!imMessageManager.current) return;

    imMessageManager.current.on('recvgroupmessage', (msg: AliVCInteraction.ImMessage, groupId: string) => {
      if (msg.type === 88889) { // 课堂状态消息
        try {
          const data = JSON.parse(msg.data);
          if (data.action === 'start_class') {
            setClassStatus(ClassStatus.IN_PROGRESS);
            showMessage('老师已开始上课');
          } else if (data.action === 'end_class') {
            setClassStatus(ClassStatus.ENDED);
            showMessage('老师已结束上课');
          }
        } catch (err) {
          console.error('解析课堂状态消息失败', err);
        }
      } else if (msg.type === 88890) { // 静音指令
        try {
          const data = JSON.parse(msg.data);
          if (data.action === 'toggle_mute' && data.userId === userId) {
            showMessage(data.mute ? '你已被老师静音' : '老师已取消你的静音');
          }
        } catch (err) {
          console.error('解析静音指令失败', err);
        }
      } else if (msg.type === 88891) { // 举手消息
        try {
          const data = JSON.parse(msg.data) as InteractionMessage;
          if (data.action === InteractionAction.HandUp) {
            const handUpData: HandUpRequest = {
              ...data,
              timestamp: data.timestamp || Date.now()
            };
            setHandUpList([...handUpList, handUpData]);
            showMessage(`${data.studentName || data.studentId} 举手了`);
          } else if (data.action === InteractionAction.CancelHandUp) {
            setHandUpList(handUpList.filter(h => h.studentId !== data.studentId));
          }
        } catch (err) {
          console.error('解析举手消息失败', err);
        }
      } else if (msg.type === 88892) { // 问题消息
        try {
          const data = JSON.parse(msg.data) as {question: string};
          if (typeof data.question === 'string') {
            const question: Question = {
              studentId: msg.sender?.userId || 'unknown',
              studentName: (() => {
                try {
                  return msg.sender?.userExtension ? JSON.parse(msg.sender.userExtension)?.nickname : null;
                } catch {
                  return null;
                }
              })() || msg.sender?.userId || '未知用户',
              question: data.question,
              timestamp: msg.timestamp || Date.now()
            };
            setQuestions([...questions, question]);
          }
          showMessage(`收到问题: ${data.question}`);
        } catch (err) {
          console.error('解析问题消息失败', err);
        }
      } else if (msg.type === 88893) { // 应答消息
        try {
          const data = JSON.parse(msg.data) as InteractionMessage;
          if (data.action === InteractionAction.AnswerHandUp && data.studentId === userId) {
            showMessage('老师已应答你的举手');
            setHandUpList(handUpList.filter(h => h.studentId !== data.studentId));
          }
        } catch (err) {
          console.error('解析应答消息失败', err);
        }
      } else if (msg.type === 88888) { // 普通文本消息
        showMessage(`${msg.sender?.userId || '未知用户'}: ${msg.data}`);
      }
    });
  };

  // RTC相关函数
  const removeRemoteVideo = (userId: string, type: 'camera' | 'screen' = 'camera') => {
    const vid = `${type}_${userId}`;
    const el = remoteVideoElMap.current[vid];
    if (el) {
      aliRtcEngine.current!.setRemoteViewConfig(null, userId, type === 'camera' ? AliRtcVideoTrack.AliRtcVideoTrackCamera : AliRtcVideoTrack.AliRtcVideoTrackScreen);
      el.pause();
      remoteVideoContainer.current?.removeChild(el);
      delete remoteVideoElMap.current[vid];
    }
  };

  const listenRtcEvents = () => {
    if (!aliRtcEngine.current) return;

    showMessage('注册rtc事件监听')

    aliRtcEngine.current.on('remoteUserOnLineNotify', (userId: string) => {
      showMessage(`用户 ${userId} 加入课堂`);
      console.log('用户上线通知:', userId);
    });

    aliRtcEngine.current.on('remoteUserOffLineNotify', (userId: string) => {
      showMessage(`用户 ${userId} 离开课堂`);
      console.log('用户下线通知:', userId);
      removeRemoteVideo(userId, 'camera');
      removeRemoteVideo(userId, 'screen');
    });

    aliRtcEngine.current.on('videoSubscribeStateChanged', (
      userId: string,
      oldState: AliRtcSubscribeState,
      newState: AliRtcSubscribeState,
      interval: number,
      channelId: string
    ) => {
      console.log(`视频订阅状态变化: 用户 ${userId}, 旧状态 ${oldState}, 新状态 ${newState}`);

      switch(newState) {
        case 3: // 订阅成功
          try {
            console.log('开始创建远程视频元素');
            
            if (remoteVideoElMap.current[`camera_${userId}`]) {
              console.log(`用户 ${userId} 的视频元素已存在`);
              return;
            }
            
            const video = document.createElement('video');
            video.autoplay = true;
            video.playsInline = true;
            video.className = 'w-80 h-45 mr-2 mb-2 bg-black';
            
            if (!remoteVideoContainer.current) {
              console.error('远程视频容器未找到');
              return;
            }
            
            remoteVideoContainer.current.style.display = 'block';
            remoteVideoContainer.current.appendChild(video);
            remoteVideoElMap.current[`camera_${userId}`] = video;
            
            aliRtcEngine.current!.setRemoteViewConfig(
              video,
              userId,
              AliRtcVideoTrack.AliRtcVideoTrackCamera
            );
            
            console.log(`已订阅用户 ${userId} 的视频流`);
            showMessage(`已显示用户 ${userId} 的视频`);
          } catch (err) {
            console.error(`订阅用户 ${userId} 视频流失败:`, err);
            showMessage(`订阅用户 ${userId} 视频流失败`);
          }
          break;
          
        case 1: // 取消订阅
          console.log(`取消订阅用户 ${userId} 的视频流`);
          removeRemoteVideo(userId, 'camera');
          break;
          
        case 2: // 订阅中
          console.log(`正在订阅用户 ${userId} 的视频流...`);
          break;
          
        default:
          console.warn(`未知订阅状态: ${newState}`);
      }
    });

    aliRtcEngine.current.on('screenShareSubscribeStateChanged', (
      userId: string,
      oldState: AliRtcSubscribeState,
      newState: AliRtcSubscribeState,
      elapseSinceLastState: number,
      channel: string
    ) => {
      console.log(`屏幕分享订阅状态变更：uid=${userId}, oldState=${oldState}, newState=${newState}`);

      switch(newState) {
        case 3: // 订阅成功
          try {
            console.log('开始创建屏幕分享视频元素');
            
            if (remoteVideoElMap.current[`screen_${userId}`]) {
              console.log(`用户 ${userId} 的屏幕分享元素已存在`);
              return;
            }
            
            const video = document.createElement('video');
            video.autoplay = true;
            video.playsInline = true;
            video.className = 'w-80 h-45 mr-2 mb-2 bg-black';
            
            if (!remoteVideoContainer.current) {
              console.error('远程视频容器未找到');
              return;
            }
            
            remoteVideoContainer.current.appendChild(video);
            remoteVideoElMap.current[`screen_${userId}`] = video;
            
            aliRtcEngine.current!.setRemoteViewConfig(
              video,
              userId,
              AliRtcVideoTrack.AliRtcVideoTrackScreen
            );
            
            console.log(`已订阅用户 ${userId} 的屏幕分享流`);
            showMessage(`已显示用户 ${userId} 的屏幕分享`);
          } catch (err) {
            console.error(`订阅用户 ${userId} 屏幕分享流失败:`, err);
            showMessage(`订阅用户 ${userId} 屏幕分享流失败`);
          }
          break;
          
        case 1: // 取消订阅
          console.log(`取消订阅用户 ${userId} 的屏幕分享流`);
          removeRemoteVideo(userId, 'screen');
          break;
          
        case 2: // 订阅中
          console.log(`正在订阅用户 ${userId} 的屏幕分享流...`);
          break;
          
        default:
          console.warn(`未知屏幕分享订阅状态: ${newState}`);
      }
    });
  };

  // 课堂操作方法
  const login = async (userId: string): Promise<void> => {
    if(!role) return;

    try {
      const { ImEngine: ImEngineClass } = window.AliVCInteraction;
      imEngine.current = ImEngineClass.createEngine();
      await imEngine.current.init({
        deviceId: 'xxxx',
        appId: IM_APP_ID,
        appSign: IM_APP_SIGN,
        logLevel: ERROR,
      });

      const imToken = await generateImToken(userId, role);
      await imEngine.current.login({
        user: {
          userId,
          userExtension: '{}'
        },
        userAuth: {
          nonce: 'AK_4',
          timestamp: Math.floor(Date.now() / 1000) + 3600 * 3,
          token: imToken,
          role
        }
      });
      
      aliRtcEngine.current = AliRtcEngine.getInstance();
      AliRtcEngine.setLogLevel(0);
      
      listenImEvents();
      listenRtcEvents();
      
      setIsLoggedIn(true);
      setErrorMessage('');
      showToast('success', '登录成功');
    } catch (err: any) {
      setErrorMessage(`登录失败: ${err.message}`);
      showToast('error', '登录失败');
    }
  };

  const joinClass = async (classId?: string): Promise<void> => {
    if (!imEngine.current || !aliRtcEngine.current) return;
    
    // 优先使用URL参数中的classId
    const { id: pathClassId } = useParams();
    const finalClassId = (classId || pathClassId) as string;
    
    if (!finalClassId) {
      setErrorMessage('课堂ID不能为空');
      showToast('error', '请输入有效的课堂ID');
      return;
    }

    try {
      const gm = imEngine.current.getGroupManager();
      const mm = imEngine.current.getMessageManager();
      imGroupManager.current = gm || null;
      imMessageManager.current = mm || null;
      await gm!.joinGroup(finalClassId);
      listenGroupEvents();
      listenMessageEvents();

      await joinRtcChannel(finalClassId);

      setIsJoinedClass(true);
      setErrorMessage('');
      showToast('success', '加入课堂成功');
    } catch (err: any) {
      setErrorMessage(`加入课堂失败: ${err.message}`);
      showToast('error', '加入课堂失败');
      
      if (imGroupManager.current) {
        try {
          await imGroupManager.current.leaveGroup(finalClassId);
        } catch (leaveErr) {
          console.error('离开IM群组失败:', leaveErr);
        }
      }
    }
  };

  const leaveClass = async (): Promise<void> => {
    try {
      if (imGroupManager.current && classId) {
        await imGroupManager.current.leaveGroup(classId);
      }
      if (aliRtcEngine.current) {
        await leaveRtcChannel();
      }
      
      setIsJoinedClass(false);
      showToast('info', '已离开课堂');
    } catch (err) {
      console.error('离开课堂失败:', err);
      showToast('error', '离开课堂时发生错误');
    }
  };

  const sendMessage = async (): Promise<void> => {
    if (!imMessageManager.current || !classId) return;

    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: msgText,
        type: 88888,
        level: NORMAL,
      });
      setMsgText('');
      setErrorMessage('');
    } catch (err: any) {
      setErrorMessage(`消息发送失败: ${err.message}`);
    }
  };

  const startClass = async (): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({ action: 'start_class' }),
        type: 88889,
        level: HIGH,
      });
      setClassStatus(ClassStatus.IN_PROGRESS);
      showToast('success', '课堂已开始');
    } catch (err: any) {
      setErrorMessage(`开始上课失败: ${err.message}`);
    }
  };

  const endClass = async (): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({ action: 'end_class' }),
        type: 88889,
        level: HIGH,
      });
      setClassStatus(ClassStatus.ENDED);
      showToast('success', '课堂已结束');
      
      try {
        await leaveRtcChannel();
      } catch (err: any) {
        console.error('离开RTC频道失败:', err);
        showToast('error', '离开RTC频道失败');
      }
    } catch (err: any) {
      setErrorMessage(`结束上课失败: ${err.message}`);
    }
  };

  const toggleMuteMember = async (userId: string, mute: boolean): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({
          action: 'toggle_mute',
          userId,
          mute
        }),
        type: 88890,
        level: HIGH,
      });
      showToast('info', mute ? `已静音用户 ${userId}` : `已取消静音用户 ${userId}`);
    } catch (err: any) {
      setErrorMessage(`操作失败: ${err.message}`);
    }
  };

  const createClass = async (className: string, maxMembers = 200): Promise<string | null> => {
    if (!imEngine.current || !isLoggedIn || role !== Role.Teacher) {
      showToast('error', '只有老师可以创建课堂');
      return null;
    }
    
    try {
      const groupManager = imEngine.current.getGroupManager();
      if (!groupManager) {
        throw new Error('群组管理器未初始化');
      }

      showToast('info', '正在创建课堂...');
      
      const response = await groupManager.createGroup({
        groupName: className,
        groupMeta: JSON.stringify({
          classType: 'interactive',
          creator: userId,
          createdAt: Date.now(),
          maxMembers
        })
      });

      if (!response?.groupId) {
        throw new Error('创建群组失败: 未返回群组ID');
      }

      try {
        await groupManager.joinGroup(response.groupId);
        
        showToast('success', '课堂创建并加入成功');
        showMessage(`课堂 ${className} 创建成功，ID: ${response.groupId}`);
        
        setClassId(response.groupId);
        setIsJoinedClass(true);
        
        const messageManager = imEngine.current.getMessageManager();
        if (messageManager) {
          imMessageManager.current = messageManager;
          listenMessageEvents();
        }
        
        await joinRtcChannel(response.groupId);
        
        setShareLink(`${window.location.href.split('?')[0]}?classId=${response.groupId}`);
        
        return response.groupId;
      } catch (joinErr: any) {
        throw new Error(`创建成功但加入失败: ${joinErr.message}`);
      }
    } catch (err: any) {
      const errorMsg = err.message.includes('alreadyExist')
        ? '课堂已存在'
        : `课堂创建失败: ${err.message}`;
      
      setErrorMessage(errorMsg);
      showToast('error', errorMsg);
      return null;
    }
  };

  const joinRtcChannel = async (classId: string, publishOptions?: {
    publishVideo?: boolean
    publishAudio?: boolean
    publishScreen?: boolean
  }) => {
    if (!aliRtcEngine.current) return;
    const {
      publishVideo = false,
      publishAudio = false,
      publishScreen = false,
    } = publishOptions || {};
    
    const timestamp = Math.floor(Date.now() / 1000) + 3600 * 3;
    const token = await generateToken(RTC_APP_ID, RTC_APP_KEY, classId, userId, timestamp);
    await aliRtcEngine.current.publishLocalVideoStream(publishVideo);
    await aliRtcEngine.current.publishLocalAudioStream(publishAudio);
    await aliRtcEngine.current.publishLocalScreenShareStream(publishScreen);
    await aliRtcEngine.current.joinChannel(
      {
        channelId: classId,
        userId,
        appId: RTC_APP_ID,
        token,
        timestamp,
      },
      userId
    );
  };

  const leaveRtcChannel = async () => {
    if (!aliRtcEngine.current) return;
    await aliRtcEngine.current.leaveChannel();
  };

  // 切换摄像头状态
  const toggleCamera = async () => {
    if(!aliRtcEngine.current?.isInCall){
      showToast('error', '先加入课堂');
      return;
    }

    try {
      if (isCameraOn) {
        await aliRtcEngine.current?.stopPreview();
        await aliRtcEngine.current?.enableLocalVideo(false)
        await aliRtcEngine.current?.publishLocalVideoStream(false)
      } else {
        await aliRtcEngine.current?.setLocalViewConfig('localPreviewer', AliRtcVideoTrack.AliRtcVideoTrackCamera);
        await aliRtcEngine.current?.enableLocalVideo(true)
        await aliRtcEngine.current?.startPreview();
        await aliRtcEngine.current?.publishLocalVideoStream(true)
   
      }
      await aliRtcEngine.current?.startAndPublishDefaultDevices()
      setIsCameraOn(!isCameraOn);
    } catch (err) {
      console.error('切换摄像头状态失败:', err);
      showToast('error', '切换摄像头失败');
    }
  };

  // 切换音频状态
  const toggleAudio = async () => {
    if(!aliRtcEngine.current?.isInCall){
      showToast('error', '先加入课堂');
      return;
    }

    try {
      if (isAudioOn) {
        await aliRtcEngine.current?.stopAudioCapture()
        await aliRtcEngine.current?.publishLocalAudioStream(false);
      } else {
        await aliRtcEngine.current?.publishLocalAudioStream(true);
      }
      await aliRtcEngine.current?.startAndPublishDefaultDevices();
      setIsAudioOn(!isAudioOn);
    } catch (err) {
      console.error('切换麦克风状态失败:', err);
      showToast('error', '切换麦克风失败');
    }
  };

  // 切换屏幕分享状态
  const toggleScreenShare = async () => {
    if(!aliRtcEngine.current?.isInCall){
      showToast('error', '先加入课堂');
      return;
    }

    try {
      if (isScreenSharing) {
        await aliRtcEngine.current?.publishLocalScreenShareStream(false)
        await aliRtcEngine.current?.stopScreenShare()
      } else {
        await aliRtcEngine.current?.publishLocalScreenShareStream(true)
        await aliRtcEngine.current?.setLocalViewConfig(
          'screenPreviewer',
          AliRtcVideoTrack.AliRtcVideoTrackScreen
        );
      }
      await aliRtcEngine.current?.startAndPublishDefaultDevices()
      setIsScreenSharing(!isScreenSharing);
    } catch (err) {
      console.error('切换屏幕分享失败:', err);
      showToast('error', '切换屏幕分享失败');
    }
  };

  const handUp = async (question?: string): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== 'student') return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({
          action: 'hand_up',
          studentId: userId,
          timestamp: Date.now(),
          question
        }),
        type: 88891,
        level: NORMAL,
      });
    } catch (err: any) {
      setErrorMessage(`举手失败: ${err.message}`);
    }
  };

  const muteStudent = async (studentId: string): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({
          action: 'toggle_mute',
          userId: studentId,
          mute: true
        }),
        type: 88890,
        level: HIGH,
      });
      showToast('info', `已静音学生 ${studentId}`);
    } catch (err: any) {
      setErrorMessage(`静音失败: ${err.message}`);
    }
  };

  const kickStudent = async (studentId: string): Promise<void> => {
    if (!imGroupManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imGroupManager.current.leaveGroup(classId);
      showToast('info', `已移出学生 ${studentId}`);
    } catch (err: any) {
      setErrorMessage(`移出失败: ${err.message}`);
    }
  };

  const answerHandUp = async (studentId: string): Promise<void> => {
    if (!imMessageManager.current || !classId || role !== Role.Teacher) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: JSON.stringify({
          action: 'answer_hand_up',
          studentId
        }),
        type: 88893,
        level: HIGH,
      });
      showToast('info', `已应答学生 ${studentId} 的举手`);
    } catch (err: any) {
      setErrorMessage(`应答失败: ${err.message}`);
    }
  };

  const sendQuestion = async (question: string): Promise<void> => {
    if (!imMessageManager.current || !classId) return;
    
    try {
      await imMessageManager.current.sendGroupMessage({
        groupId: classId,
        data: question,
        type: 88892,
        level: NORMAL,
      });
    } catch (err: any) {
      setErrorMessage(`问题发送失败: ${err.message}`);
    }
  };

  // 清理资源
  useEffect(() => {
    return () => {
      if (imGroupManager.current) {
        imGroupManager.current.removeAllListeners();
      }
      if (imMessageManager.current) {
        imMessageManager.current.removeAllListeners();
      }
      if (imEngine.current) {
        imEngine.current.removeAllListeners();
      }
      if (aliRtcEngine.current) {
        aliRtcEngine.current.destroy();
      }
    };
  }, []);

  return {
    // 状态
    userId,
    setUserId,
    isCameraOn,
    isAudioOn,
    isScreenSharing,
    className,
    setClassName,
    role,
    setRole,
    classId,
    setClassId,
    isLoggedIn,
    isJoinedClass,
    msgText,
    setMsgText,
    messageList,
    errorMessage,
    classStatus,
    handUpList,
    questions,
    students,
    shareLink,
    remoteVideoContainer,

    // 方法
    login,
    joinClass,
    leaveClass,
    sendMessage,
    startClass,
    endClass,
    toggleMuteMember,
    createClass,
    toggleCamera,
    toggleAudio,
    toggleScreenShare,
    handUp,
    answerHandUp,
    sendQuestion,
    muteStudent,
    kickStudent
  };
};