package core

import (
	"JsRpc/config"
	"JsRpc/utils"
	"context"
	"encoding/json"
	log "github.com/sirupsen/logrus"
	"math/rand"
	"time"
)

// GQueryFunc 发送请求到客户端
func (c *Clients) GQueryFunc(funcName string, param string, resChan chan<- string) {
	if c.actionData[funcName] == nil {
		rwMu.Lock()
		c.actionData[funcName] = make(map[string]chan string)
		rwMu.Unlock()
	}
	var MessageId string
	for {
		MessageId = utils.GetUUID()
		if c.readFromMap(funcName, MessageId) == nil {
			rwMu.Lock()
			c.actionData[funcName][MessageId] = make(chan string, 1)
			rwMu.Unlock()
			break
		}
		utils.LogPrint("存在的消息id,跳过")
	}
	// 确保资源释放
	defer func() {
		rwMu.Lock()
		delete(c.actionData[funcName], MessageId)
		rwMu.Unlock()
		close(resChan)
	}()

	// 构造消息并发送
	WriteData := Message{Param: param, MessageId: MessageId, Action: funcName}
	data, err := json.Marshal(WriteData)
	if err != nil {
		log.Error(err, "JSON序列化失败")
		resChan <- "JSON序列化失败"
		return
	}

	rwMu.Lock()
	err = c.clientWs.WriteMessage(1, data)
	rwMu.Unlock()
	if err != nil {
		log.Error(err, "写入数据失败")
		resChan <- "rpc发送数据失败"
		return
	}
	// 使用 context 控制超时
	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(config.DefaultTimeout)*time.Second)
	defer cancel()
	resultChan := c.readFromMap(funcName, MessageId)
	if resultChan == nil {
		resChan <- "消息ID对应的管道不存在"
		return
	}
	select {
	case res := <-resultChan:
		resChan <- res
	case <-ctx.Done():
		utils.LogPrint(MessageId + "超时了")
		resChan <- "获取结果超时 timeout"
	}
}

func getRandomClient(group string, clientId string) *Clients {
	var client *Clients
	// 不传递clientId时候，从group分组随便拿一个
	if clientId != "" {
		clientName, ok := hlSyncMap.Load(group + "->" + clientId)
		if ok == false {
			return nil
		}
		client, _ = clientName.(*Clients)
		return client
	}
	groupClients := make([]*Clients, 0)
	//循环读取syncMap 获取group名字的
	hlSyncMap.Range(func(_, value interface{}) bool {
		tmpClients, ok := value.(*Clients)
		if !ok {
			return true
		}
		if tmpClients.clientGroup == group {
			groupClients = append(groupClients, tmpClients)
		}
		return true
	})
	if len(groupClients) == 0 {
		return nil
	}
	// 使用随机数发生器
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	randomIndex := r.Intn(len(groupClients))
	client = groupClients[randomIndex]
	return client

}