package service

import (
	"encoding/json"
	"errors"
	"fmt"
	"time"
	"yuleduiPay/service/vo"

	mqtt "github.com/eclipse/paho.mqtt.golang"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/guid"
)

type MQTT struct {
	client mqtt.Client
}

var MQTTService MQTT

func (t *MQTT) InitMQTT() error {
	ip := g.Cfg().MustGet(nil, "MQTT.ip")
	port := g.Cfg().MustGet(nil, "MQTT.port")

	/*
		user := g.Cfg().MustGet(nil, "MQTT.user")
		passwd := g.Cfg().MustGet(nil, "MQTT.passwd")
	*/
	opts := mqtt.NewClientOptions()
	mqttAddress := fmt.Sprintf("mqtt://%s:%d", ip.String(), port.Int())
	g.Log().Line().Print(nil, "MQTT连接地址:", mqttAddress)
	opts.AddBroker(mqttAddress)
	opts.SetKeepAlive(time.Hour * 24)
	opts.SetPingTimeout(time.Second * 30)
	opts.SetClientID(guid.S())
	//opts.SetUsername(user.String())  //使用用户名和密码
	//opts.SetPassword(passwd.String())
	//opts.SetDefaultPublishHandler(messagePubHandler)  // 设置消息回调处理函数
	//opts.OnConnect = connectHandler
	opts.OnConnectionLost = t.connectLostHandler
	t.client = mqtt.NewClient(opts)
	token := t.client.Connect()
	if token.Wait() && token.Error() != nil {
		err := errors.New("MQTT初始化失败:" + token.Error().Error())
		g.Log().Line().Error(nil, err)
		return err
	}
	return nil
}

// MQTT 推送订单结果消息
func (t *MQTT) Publish(msg *vo.MQTTOrder) error {
	msg.MsgId = guid.S()
	msg.SendTime = time.Now().Unix()
	jsonbytes, err := json.Marshal(msg)
	if err != nil {
		return err
	}
	token := t.client.Publish(msg.Topic, 2, false, string(jsonbytes))
	tokenOk := token.Wait()
	if !tokenOk { //失败，获取错误原因
		return token.Error()
	}
	return nil
}

func (t *MQTT) connectLostHandler(client mqtt.Client, err error) {
	token := t.client.Connect()
	g.Log().Line().Print(nil, "MQTT 重新连接成功")
	token.Wait()
}