package common

import (
	"bytes"
	"fmt"
	"encoding/json"
	"math/rand"
)

// Must panics if err is not nil.
func Must(err error) {
	if err != nil {
		panic(err)
	}
}

// Must2 panics if the second parameter is not nil, otherwise returns the first parameter.
func Must2(v interface{}, err error) interface{} {
	Must(err)
	return v
}

// Error2 returns the err from the 2nd parameter.
func Error2(v interface{}, err error) error {
	return err
}

func LogF(format string,args interface{})string{
	return fmt.Sprintf(format,args)
}

func AssertJson(object interface{})string{
	json,err :=json.Marshal(object)
	if err!=nil{
		return ""
	}
	return string(json)
}

var randomChars = "ABCDEFGHJKMNPQRSTWXYZabcdefhjkmnprstwxyz2345678" /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
func RandomString(l int)string{
	return RandomStringWithChars(l,randomChars)
}

func RandomStringWithChars(l int,chars string)string{
	if l<=0{
		return ""
	}
	if len(chars)==0{
		return ""
	}
	lenChars :=len(chars) -1
	rsp :=bytes.NewBuffer(nil)
	for i:=0;i<l;i++{
		rsp.WriteByte(chars[rand.Intn(lenChars)])
	}
	return rsp.String()
}