package logic

import (
	"context"
	"fusenapi/constants"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"sync"
	"time"

	"fusenapi/server/websocket/internal/svc"
	"fusenapi/server/websocket/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type CommonNotifyLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewCommonNotifyLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CommonNotifyLogic {
	return &CommonNotifyLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

// 定义公共回调未找到websocket连接时暂存数据缓冲队列
var commonConnectionNotFoundDataCacheChan = make(chan commonConnectionNotFoundDataCacheChanItem, 2000)

type commonConnectionNotFoundDataCacheChanItem struct {
	retryTimes int                   //重回队列次数
	data       types.CommonNotifyReq //数据
}

// 放入缓冲队列
func (l *CommonNotifyLogic) pushCommonNotifyCache(data commonConnectionNotFoundDataCacheChanItem) {
	select {
	case commonConnectionNotFoundDataCacheChan <- data:
		return
	case <-time.After(time.Millisecond * 50): //超50ms就丢弃
		return
	}
}

// 取出元素
func (l *CommonNotifyLogic) popCommonNotifyCache() (data commonConnectionNotFoundDataCacheChanItem) {
	return <-commonConnectionNotFoundDataCacheChan
}

// 保证处理消息就一个循环在执行
var consumeCommonCacheData sync.Once

// 消费公共通知未处理的消息(目前是轮巡方式，待优化)
func (l *CommonNotifyLogic) consumeCommonCacheData() {
	//单例
	consumeCommonCacheData.Do(func() {
		for {
			time.Sleep(time.Millisecond * 200)
			info := l.popCommonNotifyCache()
			//查询websocket连接
			value, ok := mapConnPool.Load(info.data.Wid)
			//没有连接
			if !ok {
				info.retryTimes--
				//大于0，则放回队列
				if info.retryTimes > 0 {
					l.pushCommonNotifyCache(info)
					continue
				}
				//否则直接丢弃消息
				continue
			}
			//断言连接
			ws, ok := value.(wsConnectItem)
			if !ok {
				logx.Error("渲染回调断言websocket连接失败")
				continue
			}
			//发送
			ws.sendToOutChan(ws.respondDataFormat(constants.WEBSOCKET_COMMON_NOTIFY, info.data.Data))
		}
	})
}

// 处理进入前逻辑w,r
// func (l *CommonNotifyLogic) BeforeLogic(w http.ResponseWriter, r *http.Request) {
// }

func (l *CommonNotifyLogic) CommonNotify(req *types.CommonNotifyReq, userinfo *auth.UserInfo) (resp *basic.Response) {
	//websocket连接id不能为空
	if req.Wid == "" {
		return resp.SetStatusWithMessage(basic.CodeRequestParamsErr, "websocket connect id is empty")
	}
	//触发消费公共未处理的消息（该方法是单例）
	go l.consumeCommonCacheData()
	//查询websocket连接
	value, ok := mapConnPool.Load(req.Wid)
	if !ok {
		//没找到连接就放到公共缓冲队列
		go l.pushCommonNotifyCache(commonConnectionNotFoundDataCacheChanItem{
			retryTimes: 20, //重试20次
			data: types.CommonNotifyReq{
				Wid:  req.Wid,
				Data: req.Data,
			},
		})
		return resp.SetStatusWithMessage(basic.CodeOK, "success")
	}
	//断言连接
	ws, ok := value.(wsConnectItem)
	if !ok {
		logx.Error("渲染回调断言websocket连接失败")
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "断言连接错误")
	}
	ws.sendToOutChan(ws.respondDataFormat(constants.WEBSOCKET_COMMON_NOTIFY, req.Data))
	return resp.SetStatusWithMessage(basic.CodeOK, "success")
}

// 处理逻辑后 w,r 如:重定向, resp 必须重新处理
// func (l *CommonNotifyLogic) AfterLogic(w http.ResponseWriter, r *http.Request, resp *basic.Response) {
// // httpx.OkJsonCtx(r.Context(), w, resp)
// }