// Copyright 2019 getensh.com. All rights reserved.
// Use of this source code is governed by getensh.com.

package utils

import (
	"encoding/json"
	"fmt"
	"gd_service/consts"
	"gd_service/errors"
	"gd_service/thirdparty"
	"sync"
	"time"

	"github.com/tidwall/gjson"
	"go.uber.org/zap"

	"gd_service/common.in/cache"
	"gd_service/common.in/config"

	"github.com/astaxie/beego/orm"

	"github.com/afex/hystrix-go/hystrix"
)

const (
	HystrixClose = 0
	HystrixOpen  = 1
)

type HystrixConfig struct {
	ProviderApiName        string `json:"provider_api_name"`
	ProviderApiCode        string `json:"provider_api_code"`
	MaxConcurrentRequests  int    `json:"max_concurrent_requests"`
	RequestVolumeThreshold int    `json:"request_volume_threshold"`
	SleepWindow            int    `json:"sleep_window"`
	ErrorPercentThreshold  int    `json:"error_percent_threshold"`
	Period                 int    `json:"period"` // 熔断统计周期
	HystrixStatus          int    `json:"hystrix_status"`
	IsOn                   int    `json:"is_on"`
	LastSendTime           int64  `json:"last_send_time"`
	Mutex                  sync.Mutex
}

var settingsMutex *sync.RWMutex
var HystrixConfigMap map[string]*HystrixConfig

var HystrixConfigStatusMap map[string]int

// 构建熔断map
func constructHystrixMap() map[string]*HystrixConfig {
	hystrixConfigMap := make(map[string]*HystrixConfig)
	hystrixConfigs := []HystrixConfig{}
	orm.NewOrm().Raw("select * from db_gd_management.t_gd_provider_api_hystrix where is_on=1").QueryRows(&hystrixConfigs)

	for index, _ := range hystrixConfigs {
		hystrixConfigMap[hystrixConfigs[index].ProviderApiCode] = &hystrixConfigs[index]
		/*if _, ok := HystrixConfigStatusMap[hystrixConfigs[index].ProviderApiCode]; !ok {
			HystrixConfigStatusMap[hystrixConfigs[index].ProviderApiCode] = 0
		}*/
	}

	return hystrixConfigMap
}

// 加载数据源熔断
func ProviderApiHystrixLoad() error {
	//HystrixConfigStatusMap = make(map[string]int)
	HystrixConfigMap = constructHystrixMap()
	settingsMutex = &sync.RWMutex{}

	// 注册熔断
	for k, v := range HystrixConfigMap {
		fmt.Println("HystrixConfigMap:", v.ProviderApiCode, v.SleepWindow, v.RequestVolumeThreshold, v.ErrorPercentThreshold, v.Period)
		hystrix.ConfigureCommand(k, hystrix.CommandConfig{Timeout: int(20000000), //cmd的超时时间，一旦超时则返回失败
			MaxConcurrentRequests:  v.MaxConcurrentRequests,  //最大并发请求数
			RequestVolumeThreshold: v.RequestVolumeThreshold, //一个统计窗口10(修改为60s了)秒内请求数量。达到这个请求数量后才去判断是否要开启熔断
			SleepWindow:            v.SleepWindow,            //熔断发生后的等待恢复时间
			ErrorPercentThreshold:  v.ErrorPercentThreshold,  //失败占比
			Period:                 v.Period,
		})
	}

	go SubscribeHystrix()
	//go HystrixTimer()

	return nil
}

func CheckProviderApiHystrix(cmd string) (*HystrixConfig, bool) {
	settingsMutex.RLock()
	defer settingsMutex.RUnlock()
	v, ok := HystrixConfigMap[cmd]
	return v, ok
}

func CheckHystrixStatus(hystrixConfig *HystrixConfig, err error, response string) {
	now := time.Now().UnixNano() / 1e6
	if hystrixConfig.HystrixStatus == HystrixOpen {
		// 熔断状态开启时，判断是否超过了窗口时间，没超过不发送任何通知
		if now < (hystrixConfig.LastSendTime + int64(hystrixConfig.SleepWindow)) {
			return
		}
	}

	if err == nil {
		// 如果已开启熔断，错误为空表示恢复
		if hystrixConfig.HystrixStatus == HystrixOpen {
			hystrixConfig.HystrixStatus = HystrixClose
			content := fmt.Sprintf("数据源%s(%s)已恢复(%s)",
				hystrixConfig.ProviderApiName,
				hystrixConfig.ProviderApiCode,
				time.Now().Format(consts.DaySecLayout))
			RobotMsg(content)
			//updateHystrixMap(hystrixConfig)
		}
	} else if err == errors.VendorError {
		// 如果是三方错误，并且熔断开启，表示尝试调用数据源，任然不通
		if hystrixConfig.HystrixStatus == HystrixOpen {
			content := fmt.Sprintf("数据源%s(%s)未恢复(%s)，数据源响应：%s",
				hystrixConfig.ProviderApiName,
				hystrixConfig.ProviderApiCode,
				time.Now().Format(consts.DaySecLayout),
				response)
			RobotMsg(content)
		}
	} else {
		// 出现熔断错误，判断本地熔断状态，如果是关闭，将熔断状态设置为开启，并发送钉钉
		hystrixConfig.Mutex.Lock()
		defer hystrixConfig.Mutex.Unlock()
		if hystrixConfig.HystrixStatus == HystrixClose {

			hystrixConfig.HystrixStatus = HystrixOpen
			// xxx数据源请求失败超过xx%，触发熔断（时间段），数据源返回值
			content := fmt.Sprintf("数据源%s(%s)请求失败超过百分之%d,触发熔断(%s)",
				hystrixConfig.ProviderApiName,
				hystrixConfig.ProviderApiCode,
				hystrixConfig.ErrorPercentThreshold,
				time.Now().Format(consts.DaySecLayout))
			RobotMsg(content)
			hystrixConfig.LastSendTime = now
		}
	}
}

type Text struct {
	Content string `json:"content"`
}

type At struct {
	AtMobiles []string `json:"atMobiles"`
	IsAtAll   bool     `json:"isAtAll"`
}

type TextMsg struct {
	MsgType string `json:"msgtype"`
	Text    Text   `json:"text"`
	At      At     `json:"at"`
}

func RobotMsg(content string) (err error) {
	body := map[string]interface{}{
		"msgtype": "text",
		"text":    map[string]interface{}{"content": content},
	}
	bytes, _ := json.Marshal(body)

	h := thirdparty.HttpRequestWithHeadCommon{
		Method:  "POST",
		Url:     config.Conf.ThirdPart.HystrixWebhook,
		Body:    bytes,
		TimeOut: 10 * time.Second,
	}
	bytes, err = h.Request()
	if err != nil {
		l.Error("func",
			zap.String("call", "RobotMsg"),
			zap.String("params", content),
			zap.String("error", err.Error()))
		return errors.VendorError
	}
	errcode := gjson.GetBytes(bytes, "errcode").Int()
	errmsg := gjson.GetBytes(bytes, "errmsg").String()
	if errcode != 0 {
		l.Error("func",
			zap.String("call", "RobotMsg"),
			zap.String("params", content),
			zap.String("error", errmsg))
		return errors.VendorError
	}
	return nil

}

func ReloadHystrix() {
	hystrixConfigMapNew := constructHystrixMap()

	for k, v := range HystrixConfigMap {
		// 新的和老的都存在判断是否更新
		if value, ok := hystrixConfigMapNew[k]; ok {
			// 存在，判断是否更新
			if v.ErrorPercentThreshold != value.ErrorPercentThreshold ||
				v.MaxConcurrentRequests != value.MaxConcurrentRequests ||
				v.RequestVolumeThreshold != value.RequestVolumeThreshold ||
				v.SleepWindow != value.SleepWindow ||
				v.Period != value.Period {
				fmt.Println("update:", k, value.RequestVolumeThreshold, value.RequestVolumeThreshold, value.SleepWindow, value.Period)
				hystrix.ConfigureCommand(k, hystrix.CommandConfig{Timeout: int(20000000), //cmd的超时时间，一旦超时则返回失败
					MaxConcurrentRequests:  value.MaxConcurrentRequests,  //最大并发请求数
					RequestVolumeThreshold: value.RequestVolumeThreshold, //一个统计窗口10(修改为60s了)秒内请求数量。达到这个请求数量后才去判断是否要开启熔断
					SleepWindow:            value.SleepWindow,            //熔断发生后的等待恢复时间
					ErrorPercentThreshold:  value.ErrorPercentThreshold,  //失败占比
					Period:                 value.Period,
				})

				v.ErrorPercentThreshold = value.ErrorPercentThreshold
				v.MaxConcurrentRequests = value.MaxConcurrentRequests
				v.RequestVolumeThreshold = value.RequestVolumeThreshold
				v.SleepWindow = value.SleepWindow
				v.Period = value.Period
			}
		} else {
			// 新的不存在
			settingsMutex.Lock()
			delete(HystrixConfigMap, k)
			settingsMutex.Unlock()
		}
	}

	for k, v := range hystrixConfigMapNew {
		if _, ok := HystrixConfigMap[k]; !ok {
			hystrix.ConfigureCommand(k, hystrix.CommandConfig{Timeout: int(20000000), //cmd的超时时间，一旦超时则返回失败
				MaxConcurrentRequests:  v.MaxConcurrentRequests,  //最大并发请求数
				RequestVolumeThreshold: v.RequestVolumeThreshold, //一个统计窗口10(修改为60s了)秒内请求数量。达到这个请求数量后才去判断是否要开启熔断
				SleepWindow:            v.SleepWindow,            //熔断发生后的等待恢复时间
				ErrorPercentThreshold:  v.ErrorPercentThreshold,  //失败占比
				Period:                 v.Period,
			})
			settingsMutex.Lock()
			HystrixConfigMap[k] = v
			settingsMutex.Unlock()
		}
	}
}

func SubscribeHystrix() {
	pubsub := cache.Redis.Subscribe(config.Conf.ThirdPart.HystrixPublishChannel)
	defer pubsub.Close()

	for msg := range pubsub.Channel() {
		if msg.Payload == "hystrix-update" {
			ReloadHystrix()
		}
	}
}