package db

import (
	"context"
	"errors"
	"go.etcd.io/etcd/clientv3"
	"locking-kit-server/consts"
	"log"
	"time"
)

/**
 * @author yuanrh
 * @description etcd数据库客户端
 * @date 2021/6/28 11:11
 **/


/**
获取客户端连接
*/
func GetClient() (*clientv3.Client,error){

	cli, err := clientv3.New(clientv3.Config{
		Endpoints:   []string{consts.ETCD_URL},
		DialTimeout: 5 * time.Second,
	})
	if err != nil {
		// handle error!
		log.Printf("connect to etcd failed, err:%v\n", err)
		return nil,err
	}

	//log.Println("connect to etcd success")
	return cli,nil
}

/**
删除包含该前缀的所有Key
*/
func DeleteWithPrefix(prefix string) error{

	if len(prefix)==0{
		return errors.New("参数prefix不能为空")
	}

	client,err := GetClient()
	if err!=nil{
		return err
	}
	defer client.Close()

	_, err = client.KV.Delete(context.Background(),prefix, clientv3.WithPrefix())
	if err!=nil{
		log.Println(err)
		return err
	}

	return err
}

/**
批量增加
*/
func BatchAdd(dataMap map[string] string) error{

	if dataMap==nil || len(dataMap)==0{
		return errors.New("dataMap为空")
	}

	client,err := GetClient()
	if err!=nil{
		return err
	}
	defer  client.Close()

	for k, v := range dataMap {

		_, err = client.KV.Put(context.Background(), k, v)

		if err!=nil{
			log.Println(err)
			return err
		}
	}

	return nil
}

/**
替换k,v
*/
func ReplaceInto(k, v string) error{

	client,err := GetClient()
	if err!=nil{
		return err
	}
	defer client.Close()

	_,err =client.KV.Put(context.Background(), k, v)
	if err!=nil{
		log.Println(err)
		return err
	}

	return nil
}

/**
根据后缀查询
*/
func QueryWithPrefix(prefix string) (map[string] string,error){
	client,err := GetClient()
	if err!=nil{
		log.Println(err)
		return nil,err
	}
	defer client.Close()

	resp,err :=client.KV.Get(context.Background(),prefix, clientv3.WithPrefix())

	if err!=nil{
		log.Println(err)
		return nil,err
	}
	var gobalFileMap = make(map[string] string)
	for _,v := range resp.Kvs{
		gobalFileMap[string(v.Key)]=string(v.Value)
	}
	return gobalFileMap,nil;
}