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package com.feingto.iot.common.service.mqtt;

import com.feingto.iot.common.model.mqtt.SendMessage;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.handler.codec.mqtt.*;
import lombok.extern.slf4j.Slf4j;

import java.util.List;

/**
 * 消息请求
 *
 * @author longfei
 */
@Slf4j
public class MessageRequest {
    /**
     * 推送消息
     */
    public static void publish(Channel channel, SendMessage msg) {
        log.debug(">>> publish to topic: {} of message: {}", msg.topic(), new String(msg.payload()));
        channel.writeAndFlush(new MqttPublishMessage(
                new MqttFixedHeader(MqttMessageType.PUBLISH, msg.dup(),
                        msg.mqttQoS(), msg.retain(), 0),
                new MqttPublishVariableHeader(msg.topic(), msg.id()),
                Unpooled.wrappedBuffer(msg.payload())));
    }

    /**
     * 订阅消息
     */
    public static void subscribe(Channel channel, List mqttTopicSubscriptions, int messageId) {
        channel.writeAndFlush(new MqttSubscribeMessage(
                new MqttFixedHeader(MqttMessageType.SUBSCRIBE, false,
                        MqttQoS.AT_LEAST_ONCE, false, 0),
                MqttMessageIdVariableHeader.from(messageId),
                new MqttSubscribePayload(mqttTopicSubscriptions)));
    }

    /**
     * 取消订阅消息
     */
    public static void unsubscribe(Channel channel, List topic, int messageId) {
        channel.writeAndFlush(new MqttUnsubscribeMessage(
                new MqttFixedHeader(MqttMessageType.UNSUBSCRIBE, false,
                        MqttQoS.AT_LEAST_ONCE, false, 0x02),
                MqttMessageIdVariableHeader.from(messageId),
                new MqttUnsubscribePayload(topic)));
    }

    /**
     * PING请求
     */
    public static void pingreq(Channel channel) {
        channel.writeAndFlush(new MqttMessage(
                new MqttFixedHeader(MqttMessageType.PINGREQ, false,
                        MqttQoS.AT_MOST_ONCE, false, 0)));
    }

    /**
     * 断开连接消息
     */
    public static void disconnect(Channel channel) {
        channel.writeAndFlush(new MqttMessage(
                new MqttFixedHeader(MqttMessageType.DISCONNECT, false,
                        MqttQoS.AT_LEAST_ONCE, false, 0x02)));
    }
}