package com.ruoyi.device.mqtt.client;

import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.spring.SpringUtils;
import com.ruoyi.device.config.MessageRouter;
import com.ruoyi.device.config.MqttConfig;
import jakarta.annotation.Resource;
import org.eclipse.paho.client.mqttv3.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

/**
 * 连接完成补订阅、断线重连
 * 接收消息、发送消息
 *
 * @author lwm
 */
@Component
public class MessageCallback implements MqttCallbackExtended
{
    private static final Logger log = LoggerFactory.getLogger(MessageCallback.class);

    @Resource
    @Lazy
    EmqClient emqClient;
    @Resource
    MqttConfig mqttConfig;

    /**
     * 连接完成，订阅所有主题
     */
    @Override
    public void connectComplete(boolean reconnect, String serverUri)
    {
        emqClient.subscribeAll();
    }

    /**
     * 丢失了对服务端的连接后触发的回调
     */
    @Override
    public void connectionLost(Throwable cause)
    {
        emqClient.reConnect();
    }

    /**
     * 应用收到消息后触发的回调
     * 之前在 EmqClient 已经使用 subscribe(topic, qos, IMqttMessageListener) 时由监听器消费
     *
     * 现在再来一遍
     */
    @Override
    public void messageArrived(String topic, MqttMessage message) throws Exception
    {
        if (StringUtils.isEmpty(mqttConfig.getMessageRouters()))
        {
            return;
        }
        for (MessageRouter router : mqttConfig.getMessageRouters())
        {
            String topicFilter = router.getTopic();
            if(isMatched(topicFilter, topic))
            {
                IMqttMessageListener listener = SpringUtils.getBean(router.getListener());
                listener.messageArrived(topic, message);
            }
        }
    }

    /**
     * 判断主题是否匹配
     *
     */
    private boolean isMatched(String topicFilter, String topic) {
        if (topicFilter.startsWith("$queue/"))
        {
            topicFilter = topicFilter.replaceFirst("\\$queue/", "");
        }
        else if (topicFilter.startsWith("$share/"))
        {
            topicFilter = topicFilter.replaceFirst("\\$share/", "");
            topicFilter = topicFilter.substring(topicFilter.indexOf('/') + 1);
        }
        return MqttTopic.isMatched(topicFilter, topic);
    }

    /**
     * 消息发布者消息发布完成产生的回调
     */
    @Override
    public void deliveryComplete(IMqttDeliveryToken token)
    {
        if (token == null)
        {
            return;
        }
        int messageId = token.getMessageId();
        String[] topics = token.getTopics();
        log.info("消息发布完成,messageid={},topics={}", messageId, topics);
    }
}