package logic

import (
	"context"
	"fmt"
	"github.com/zeromicro/go-zero/core/logx"
	"time"
)

var (
	//用户标识的连接(白板用户不存)
	mapUserConnPool = make(map[string]map[string]struct{}) //key是user_id +"_"+guest_id （val是个普通map，存储这个用户的所有连接标识）
	//用户标识的连接增删操作队列
	userConnPoolCtlChan = make(chan userConnPoolCtlChanItem, 500)
)

// 添加用户索引池ws连接
func createUserConnPoolElement(userId, guestId int64, uniqueId string) {
	if userId == 0 && guestId == 0 {
		return
	}
	data := userConnPoolCtlChanItem{
		userId:      userId,
		guestId:     guestId,
		uniqueId:    uniqueId,
		message:     nil,
		messageType: "",
		option:      1,
	}
	select {
	case userConnPoolCtlChan <- data:
		return
	case <-time.After(time.Millisecond * 200):
		return
	}
}

// 从用户索引池删除ws连接
func deleteUserConnPoolElement(userId, guestId int64, uniqueId string) {
	if userId == 0 && guestId == 0 {
		return
	}
	data := userConnPoolCtlChanItem{
		userId:      userId,
		guestId:     guestId,
		uniqueId:    uniqueId,
		message:     nil,
		messageType: "",
		option:      0,
	}
	select {
	case userConnPoolCtlChan <- data:
		return
	case <-time.After(time.Millisecond * 200):
		return
	}
}

// 根据用户索引发现链接并发送(广播)消息到出口队列
func sendToOutChanByUserIndex(userId, guestId int64, message []byte) {
	data := userConnPoolCtlChanItem{
		userId:   userId,
		guestId:  guestId,
		uniqueId: "",
		message:  message,
		option:   2,
	}
	select {
	case userConnPoolCtlChan <- data:
		return
	case <-time.After(time.Millisecond * 200):
		return
	}
}

// 消费用户索引创建/删除/发送消息中的任务数据
func ConsumeUserConnPoolCtlChanData(ctx context.Context) {
	defer func() {
		if err := recover(); err != nil {
			logx.Error("ConsumeUserConnPoolCtlChanData panic:", err)
		}
	}()
	go func() {
		select {
		case <-ctx.Done():
			panic("ConsumeUserConnPoolCtlChanData ctx deadline")
		}
	}()
	var (
		data    userConnPoolCtlChanItem
		userKey string
	)
	for {
		select {
		case data = <-userConnPoolCtlChan:
			userKey = getmapUserConnPoolUniqueId(data.userId, data.guestId)
			switch data.option {
			case 2: //发送消息
				logx.Info("通过用户id索引发送消息")
				mapUserUniqueId, ok := mapUserConnPool[userKey]
				if !ok {
					logx.Info("通过用户id索引发送消息,连接不存在，用户索引key:", userKey)
					continue
				}
				for uniqueId, _ := range mapUserUniqueId {
					//根据uniqueId查询原始池中连接
					mapConnPoolVal, ok := mapConnPool.Load(uniqueId)
					if !ok {
						logx.Info("通过用户id索引发送消息,连接不存在，用户索引key:", userKey, "  原始uniqueId:", uniqueId)
						continue
					}
					originConn, ok := mapConnPoolVal.(wsConnectItem)
					if !ok {
						logx.Error("通过用户id索引发送消息,断言原始连接失败，用户索引key:", userKey, "  原始uniqueId:", uniqueId)
						continue
					}
					originConn.sendToOutChan(data.message)
				}
			case 1: //添加
				logx.Info("添加用户id索引标识：", data.uniqueId)
				//存在这个用户的map池子
				if mapUserUniqueId, ok := mapUserConnPool[userKey]; ok {
					mapUserUniqueId[data.uniqueId] = struct{}{}
				} else {
					mapUserConnPool[userKey] = make(map[string]struct{})
					mapUserConnPool[userKey][data.uniqueId] = struct{}{}
				}
			case 0: //删除
				logx.Info("删除用户id索引标识：", data.uniqueId)
				if mapUserUniqueId, ok := mapUserConnPool[userKey]; ok {
					delete(mapUserUniqueId, data.uniqueId)
				}
			}
		}
	}
}

// 获取mapUserConnPool唯一id
func getmapUserConnPoolUniqueId(userId, guestId int64) (uniqueId string) {
	if userId > 0 {
		guestId = 0
	}
	return fmt.Sprintf("%d_%d", userId, guestId)
}