package lc

import (
	"runtime/debug"
	"sync"
	"time"

	"github.com/sirupsen/logrus"
	"lc-smartX/util"
	"lc-smartX/util/mqtt"
)

type OptType uint8

const (
	ToCloud OptType = 1 //发布和订阅云端的消息
)

var _mqttMgronce sync.Once
var _mqttMgrsingle *MQTTMgr

// GetMQTTMgr 单态
func GetMQTTMgr() *MQTTMgr {
	_mqttMgronce.Do(func() {
		_mqttMgrsingle = _newMQTTMgr()
	})
	return _mqttMgrsingle
}

type MQTTMgr struct {
	Cloud *MqttClient
	Queue *util.MlQueue
}

// 建两个client
func _newMQTTMgr() *MQTTMgr {
	mgr := &MQTTMgr{
		Queue: util.NewQueue(2000),
	}

	mgr.Cloud = NewMqttClient(util.Config.Mqtt.Server,
		"demo_client",
		util.Config.Mqtt.User,
		util.Config.Mqtt.Password,
		util.Config.Mqtt.Timeout,
		&EmptyMqttOnline{})

	return mgr
}

// Subscribe 定阅
func (o *MQTTMgr) Subscribe(topic string, qos mqtt.QOS, handler mqtt.MessageHandler, tp OptType) {
	if o.Cloud != nil {
		o.Cloud.Handle(topic, handler)
		o.Cloud.Subscribe(topic, qos)
	}
}

// UnSubscribe 退定
func (o *MQTTMgr) UnSubscribe(topic string, tp OptType) {
	if o.Cloud != nil {
		o.Cloud.Unsubscribe(topic)
	}
}

// Publish 发布进队列
func (o *MQTTMgr) Publish(topic string, payload []byte, qos mqtt.QOS, tp OptType) {
	msg := MQTTMessage{
		topic:   topic,
		payload: payload,
		qos:     qos,
		tp:      tp,
	}
	o.Queue.Put(&msg)
}

// 发布低
func (o *MQTTMgr) _publish(msg *MQTTMessage) error {
	var err error
	if o.Cloud != nil {
		err = o.Cloud.Publish(msg.topic, msg.payload, msg.qos)
	}
	return err
}

// MQTTConnectMgr 连接保持
func (o *MQTTMgr) MQTTConnectMgr(args ...interface{}) interface{} {
	for {
		time.Sleep(10 * time.Second)
		if o.Cloud != nil {
			o.Cloud.Connect()
		}
	}
}

func (o *MQTTMgr) MQTTMessageHandle(args ...interface{}) interface{} {
	defer func() {
		if err := recover(); err != nil {
			logrus.Errorf("MQTTMgr.MQTTMessageHandle发生异常:%v", err)
			logrus.Errorf("MQTTMgr.MQTTMessageHandle发生异常,堆栈信息:%s", string(debug.Stack()))
			go o.MQTTMessageHandle(args)
		}
	}()
	var err error
	for { //队列中所有发布
		if m, ok, _ := o.Queue.Get(); ok {
			if msg, ok := m.(*MQTTMessage); ok {
				err = o._publish(msg)
				if err != nil {
					logrus.Errorf("发布主题为%s的消息失败，原因:%s", msg.topic, err.Error())
				}
			}
		} else {
			time.Sleep(200 * time.Millisecond)
		}
	}
}

type MQTTMessage struct {
	topic   string
	payload []byte
	qos     mqtt.QOS
	tp      OptType
}