package utils

import (
	"bytes"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"github.com/skip2/go-qrcode"
	"github.com/segmentio/ksuid"
	"math/rand"
	"os"
	"strconv"
	"strings"
	"time"
)

type Error struct {
	Code int    `json:"code"`
	Desc string `json:"desc"`
}

/**
生成一个随机的不重复的用户ID
*/
func GenUUID() string {
	uuid, _ := ksuid.NewRandomWithTime(time.Now())
	return uuid.String()
}

/**
隐藏手机号码中间4位
*/
func KeepSecretForMobile(mobile string) string {
	if len(mobile) > 0 {
		var sqlBuf bytes.Buffer
		sqlBuf.WriteString(mobile[0:3])
		sqlBuf.WriteString("****")
		sqlBuf.WriteString(mobile[7:11])
		return sqlBuf.String()
	}
	return ""
}

/**
生成一个随机的不重复的数字
*/
func GenUserIdentifier() string {
	random := rand.New(rand.NewSource(time.Now().UnixNano()))
	return fmt.Sprintf("%08v", random.Int31n(100000000))
}

/**
产生随机验证码
*/
func GenRandomCode() string {
	random := rand.New(rand.NewSource(time.Now().UnixNano()))
	return fmt.Sprintf("%06v", random.Int31n(1000000))
}

/**
用户头像处理
*/
func CompleteAvatar(avatar, defaultAvatar string) string {
	if len(avatar) > 0 && (strings.HasPrefix(avatar, "http://") || strings.HasPrefix(avatar, "https://")) {
		return avatar
	}
	return defaultAvatar
}

/**
生成二维码
*/
func main() {
	qrcode.WriteFile("http://www.flysnow.org/",qrcode.Medium,256,"./blog_qrcode.png")

}

// 如果不存在指定的目录, 则直接创建一个
func IsNotExistMkDirAll(path string) error {
	_, err := os.Stat(path)
	if notExist := os.IsNotExist(err); notExist == true {
		err := os.MkdirAll(path, os.ModePerm)
		if err != nil {
			return err
		}
	}
	return nil
}

/**
随机文件名, 防止文件名重复
*/
func RandImageName(len int) string {
	b := make([]byte, len)
	rand.Read(b)
	return fmt.Sprintf("%x", b) + strconv.FormatInt(time.Now().Unix(), 10)
}

/**
生成签名Sig
*/
func CalculateSigForTempl(appkey string, random string, mobiles []string, time int64) string {
	cnt := len(mobiles)
	if cnt == 0 {
		return ""
	}
	var buffer bytes.Buffer
	buffer.WriteString(mobiles[0])
	for i := 1; i < cnt; i++ {
		buffer.WriteString(",")
		buffer.WriteString(mobiles[i])
	}
	str := "appkey=" + appkey + "&random=" + random + "&time=" + strconv.FormatInt(time, 10) + "&mobile=" + buffer.String()
	hash := sha256.New()
	hash.Write([]byte(str))
	hashInBytes := hash.Sum(nil)
	return hex.EncodeToString(hashInBytes)
}

func Interface2String(inter interface{}) string {
	switch inter.(type) {
	case string:
		return inter.(string)
	case int:
		return strconv.Itoa(inter.(int))
	case int64:
		return strconv.FormatInt(inter.(int64), 10)
	case float64:
		return strconv.FormatFloat(inter.(float64), 'f', -1, 64)
	case bool:
		return strconv.FormatBool(inter.(bool))
	}
	return ""
}