package service

import (
	"encoding/json"
	"errors"
	"fmt"
	"runtime"
	"runtime/debug"
	"smart_tunnel_edge/mqtt"
	"smart_tunnel_edge/util/config"
	"smart_tunnel_edge/util/logger"
	"strconv"
	"strings"
	"sync"
	"time"
)

func InitMqtt() {
	MqttService = GetHandler()
	MqttService.SubscribeTopics()
	go MqttService.Handler()
}

var MqttService *MqttHandler

type MqttHandler struct {
	queue *mqtt.MlQueue
}

var _handlerOnce sync.Once
var _handlerSingle *MqttHandler

func GetHandler() *MqttHandler {
	_handlerOnce.Do(func() {
		_handlerSingle = &MqttHandler{
			queue: mqtt.NewQueue(10000),
		}
	})
	return _handlerSingle
}

func (o *MqttHandler) SubscribeTopics() {
	mqtt.GetMQTTMgr().Subscribe("smart_tunnel/#", mqtt.AtLeastOnce, o.HandlerData)
}

func (o *MqttHandler) HandlerData(m mqtt.Message) {
	for {
		ok, cnt := o.queue.Put(&m)
		if ok {
			break
		} else {
			logger.Logger.Errorf("HandlerData:查询队列失败,队列消息数量:%d", cnt)
			runtime.Gosched()
		}
	}
}

func (o *MqttHandler) Handler() interface{} {
	defer func() {
		if err := recover(); err != nil {
			go GetHandler().Handler()
			logger.Logger.Errorf("MqttHandler.Handler:发生异常:%s", string(debug.Stack()))
		}
	}()
	for {
		msg, ok, quantity := o.queue.Get()
		if !ok {
			time.Sleep(10 * time.Millisecond)
			continue
		} else if quantity > 1000 {
			logger.Logger.Warnf("数据队列累积过多,请注意优化,当前队列条数:%d", quantity)
		}
		m, ok := msg.(*mqtt.Message)
		if !ok {
			continue
		}
		tunnelId, topic, err := ParseTopic(m.Topic())
		if err != nil {
			logger.Logger.Errorf("parseTopic err")
			continue
		}
		if tunnelId != config.Instance().TunnelId {
			continue
		}
		switch topic {
		case TopicLampControl:
			data := m.PayloadString()
			data1 := data[0:1]
			data2 := data[1:]
			radarId, _ := strconv.Atoi(data1)
			brightNess, _ := strconv.Atoi(data2)
			SetLampBright(int8(radarId), brightNess)
		case TopicSwitchControl:
			data := m.PayloadString()
			data1 := data[0:1]
			data2 := data[1:2]
			data3 := data[2:3]
			radarId, _ := strconv.Atoi(data1)
			way, _ := strconv.Atoi(data2)
			turnOf, _ := strconv.Atoi(data3)
			SetSwitchRelay(int8(radarId), way, turnOf)
		case TopicTunnelTactics:
			// 修改策略
			num, _ := strconv.Atoi(m.PayloadString())
			updates := map[string]interface{}{
				"id": num,
			}
			if !updateConfigAndReload(updates) {
				continue
			}

		case TopicTunnelTiming:
			// 修改时控
			var data map[string]interface{}
			if err := json.Unmarshal([]byte(m.PayloadString()), &data); err != nil {
				logger.Logger.Errorf("Error unmarshalling JSON: %v", err)
				continue
			}

			updates := map[string]interface{}{
				"startTime": data["startTime"],
				"endTime":   data["endTime"],
			}
			if !updateConfigAndReload(updates) {
				continue
			}
		}
	}
}

func (o *MqttHandler) Publish(topic string, data interface{}) error {
	return mqtt.GetMQTTMgr().Publish(topic, data, mqtt.AtLeastOnce)
}

func (o *MqttHandler) GetTopic(operation string) string {
	tunnelId := config.Instance().TunnelId
	return fmt.Sprintf("smart_tunnel/%s/%s", tunnelId, operation)
}

func ParseTopic(topic string) (sn string, operate string, err error) {
	strList := strings.Split(topic, "/")
	sn = strList[1]
	operate = strList[2]
	if len(strList) != 3 {
		return "", "", errors.New("不支持的topic")
	}
	return
}

func updateConfigAndReload(updates map[string]interface{}) bool {
	if err := config.UpdateYAMLConfig(updates); err != nil {
		logger.Logger.Errorf("修改yaml失败 err: %v", err)
		return false
	}
	config.ReloadConfig()
	return true
}

const (
	TopicGatherDataEnv = "gatherDataEnv"
	TopicGatherDataOpt = "gatherDataOpt"
	TopicTunnelTactics = "tunnelTactics"
	TopicTunnelTiming  = "tunnelTiming"
	TopicLampControl   = "lampControl"
	TopicSwitchControl = "switchControl"
)