import * as Paho from 'paho-mqtt';

// MQTT消息类型定义
export interface MqttMessage {
  topic: string;
  payload: string | ArrayBuffer;
  qos: number;
  retained: boolean;
  time: Date;
}
// 订阅选项
export interface SubscribeOptions {
  qos: 0 | 1 | 2;
}

// 根据当前页面协议自动选择MQTT配置
const getMqttConfig = () => {
  // 检测当前页面协议（http: 或 https:）
  const isHttps = window.location.protocol === 'https:';
  return {
    // 自动切换协议：https页面用wss，http页面用ws
    protocol: isHttps ? 'wss' : 'ws',
    host: 'www.cnxhyc.com',
    // 自动切换端口：https对应9084，http对应9083
    port: isHttps ? 9084 : 9083,
    // 认证信息
    username: 'admin',
    password: '#YtvpSfCNG',
    clientId: `vue3-mqtt-client-${Date.now()}-${Math.random().toString(36).substring(2, 10)}`,
    cleanSession: true,
    keepAliveInterval: 60,
    reconnect: true,
  };
};
const MQTT_CONFIG = getMqttConfig();

// MQTT客户端组合式API
export function useMqtt() {
  // 客户端实例
  let client: Paho.Client | null = null;
  // 状态管理（修复：已导入ref）
  const connected = ref(false);
  const connecting = ref(false);
  const error = ref<Error | null>(null);
  const messages = ref<MqttMessage[]>([]);
  const subscribedTopics = ref<string[]>([]);
  // 事件回调
  const connectCallbacks: (() => void)[] = [];
  const messageCallbacks: ((message: MqttMessage) => void)[] = [];
  const errorCallbacks: ((err: Error) => void)[] = [];
  const disconnectCallbacks: (() => void)[] = [];
  // 修复：移除无用的p0参数，connect方法不接受回调（通过onConnect注册）
  const connect = () => {
    if (connected.value || connecting.value) return;
    connecting.value = true;
    error.value = null;

    try {
      client = new Paho.Client(
        MQTT_CONFIG.host, 
        MQTT_CONFIG.port,
        MQTT_CONFIG.clientId
      );

      // 设置连接选项
      const connectOptions: Paho.ConnectOptions = {
        userName: MQTT_CONFIG.username,
        password: MQTT_CONFIG.password,
        cleanSession: MQTT_CONFIG.cleanSession,
        keepAliveInterval: MQTT_CONFIG.keepAliveInterval,
        reconnect: MQTT_CONFIG.reconnect,
        useSSL: MQTT_CONFIG.protocol === 'wss',  // 关键：根据协议自动启用 SSL

        // 连接成功回调
        onSuccess: () => {
          console.log('MQTT连接成功');
          connected.value = true;
          connecting.value = false;
          connectCallbacks.forEach(cb => cb()); // 触发所有连接成功回调
        },

        // 连接失败回调
        onFailure: (err) => {
          console.error('MQTT连接失败:', err);
          error.value = new Error(err.errorMessage || '连接失败');
          connected.value = false;
          connecting.value = false;
          errorCallbacks.forEach(cb => cb(error.value!));
        }
      };

      // 设置客户端回调
      client.onConnectionLost = (responseObject) => {
        if (responseObject.errorCode !== 0) {
          console.error('连接丢失:', responseObject.errorMessage);
          error.value = new Error(responseObject.errorMessage || '连接丢失');
          errorCallbacks.forEach(cb => cb(error.value!));
        }

        connected.value = false;
        connecting.value = false;
        disconnectCallbacks.forEach(cb => cb());
      };

      // 消息接收回调
      client.onMessageArrived = (message) => {
        const newMessage: MqttMessage = {
          topic: message.destinationName,
          payload: message.payloadString || message.payloadBytes,
          qos: message.qos,
          retained: message.retained,
          time: new Date()
        };

        messages.value.push(newMessage);
        messageCallbacks.forEach(cb => cb(newMessage));
      };

      // 连接服务器
      client.connect(connectOptions);
    } catch (err) {
      console.error('MQTT连接异常:', err);
      error.value = err as Error;
      connected.value = false;
      connecting.value = false;
      errorCallbacks.forEach(cb => cb(error.value!));
    }
  };

  // 断开连接
  const disconnect = () => {
    if (!client || !connected.value) return;

    client.disconnect();
    client = null;
    connected.value = false;
    subscribedTopics.value = [];
    disconnectCallbacks.forEach(cb => cb());
  };

  // 订阅主题
  const subscribe = (topic: string, options: SubscribeOptions): Promise<void> => {
    return new Promise((resolve, reject) => {
      if (!client || !connected.value) {
        reject(new Error('未连接到MQTT服务器'));
        return;
      }

      if (subscribedTopics.value.includes(topic)) {
        resolve();
        return;
      }

      client.subscribe(topic, {
        qos: options.qos,
        onSuccess: () => {
          console.log(`订阅主题成功: ${topic}`);
          subscribedTopics.value.push(topic);
          resolve();
        },
        onFailure: (err) => {
          console.error(`订阅主题失败: ${topic}`, err);
          reject(new Error(err.errorMessage || `订阅主题 ${topic} 失败`));
        }
      });
    });
  };

  // 取消订阅
  const unsubscribe = (topic: string): Promise<void> => {
    return new Promise((resolve, reject) => {
      if (!client || !connected.value) {
        reject(new Error('未连接到MQTT服务器'));
        return;
      }

      if (!subscribedTopics.value.includes(topic)) {
        resolve();
        return;
      }

      client.unsubscribe(topic, {
        onSuccess: () => {
          console.log(`取消订阅主题成功: ${topic}`);
          subscribedTopics.value = subscribedTopics.value.filter(t => t !== topic);
          resolve();
        },
        onFailure: (err) => {
          console.error(`取消订阅主题失败: ${topic}`, err);
          reject(new Error(err.errorMessage || `取消订阅主题 ${topic} 失败`));
        }
      });
    });
  };

  // 发布消息
  const publish = (
    topic: string,
    payload: string | ArrayBuffer,
    options: { qos: 0 | 1 | 2; retained?: boolean }
  ): Promise<void> => {
    return new Promise((resolve, reject) => {
      if (!client || !connected.value) {
        reject(new Error('未连接到MQTT服务器'));
        return;
      }

      if (!topic) {
        reject(new Error('主题不能为空'));
        return;
      }

      const message = new Paho.Message(
        typeof payload === 'string' ? payload : payload.toString()
      );

      message.destinationName = topic;
      message.qos = options.qos;
      message.retained = options.retained ?? false;

      client.send(message);
      resolve();
    });
  };

  // 事件注册
  const onConnect = (callback: () => void) => {
    connectCallbacks.push(callback);
  };

  const onMessage = (callback: (message: MqttMessage) => void) => {
    messageCallbacks.push(callback);
  };

  const onError = (callback: (err: Error) => void) => {
    errorCallbacks.push(callback);
  };

  const onDisconnect = (callback: () => void) => {
    disconnectCallbacks.push(callback);
  };

  // 组件卸载时断开连接
  onUnmounted(() => {
    disconnect();
  });

  return {
    connected,
    connecting,
    error,
    messages,
    subscribedTopics,
    connect,
    disconnect,
    subscribe,
    unsubscribe,
    publish,
    onConnect,
    onMessage,
    onError,
    onDisconnect
  };
}