package utils

import (
	"crypto/hmac"
	"crypto/sha1"
	"encoding/hex"
	"git.qianqiusoft.com/qianqiusoft/go-uuid/uuid"
	"git.qianqiusoft.com/qianqiusoft/light-apiengine/entitys"
	"git.qianqiusoft.com/qianqiusoft/light-apiengine/logs"
	"github.com/gin-gonic/gin"
	"math/rand"
	"net/url"
	"os"
	"regexp"
	"strings"
	"time"
)

const (
	hmac_key = "hmac_key_"
)

func NewUUID() string {
	//return uuid.NewV4().String()
	return uuid.New()
}

func GenerateToken(plain string) string {
	hash := hmac.New(sha1.New, []byte(hmac_key))
	hash.Write([]byte(plain))
	return hex.EncodeToString(hash.Sum(nil))
}

func TotalPage(record, size int) int {
	tp := record / size
	if tp < 0 {
		return 1
	}
	if record%size == 0 {
		return tp
	}
	return tp + 1
}

func FormatForBrowse(agent, val string) string {
	if strings.Contains(strings.ToLower(agent), "safari/") && !strings.Contains(strings.ToLower(agent), "chrome/") {
		logs.Debug("Safari浏览器编码")
	} else if strings.Contains(strings.ToLower(agent), "firefox/") {
		logs.Debug("Firefox浏览器编码")
	} else if strings.Contains(strings.ToLower(agent), "chrome/") && strings.Contains(strings.ToLower(agent), "safari/") && !strings.Contains(strings.ToLower(agent), "edge/") {
		logs.Debug("Chrome浏览器编码")
	} else {
		logs.Debug("IE浏览器编码")
		val = url.QueryEscape(val)
		val = strings.Replace(val, "+", "%20", -1)
	}
	return val
}

func GetHostname(ctx *gin.Context)string{
	host := ctx.Request.Host
	i := strings.Index(host, ":")
	if i > 0{
		host = host[:i]
	}

	return host
}

/**
* @brief: 把域名分成列表，最小包括部分顶级域名，例如：www.baidu.com 返回[www.baidu.com, baidu.com]
× @param1 hostname: 请求名称
*/
func GetHostnames(ctx *gin.Context)[]string{
	hostname := GetHostname(ctx)
	patternstr := `(2(5[0-5]{1}|[0-4]\d{1})|[0-1]?\d{1,2})(\.(2(5[0-5]{1}|[0-4]\d{1})|[0-1]?\d{1,2})){3}`
	reg := regexp.MustCompile(patternstr)
	if res := reg.FindAllString(hostname, -1); res == nil {
		arr := []string{}
		parts := strings.Split(hostname, ".")
		if len(parts) <= 2{
			arr = append(arr, hostname)
		}else{
			arr = append(arr, hostname)
			for i := 0; i < len(parts) - 2; i++ {
				arr = append(arr, strings.Join(parts[i+1:], "."))
			}
		}
		return  arr
	} else {
		// 直接返回ip
		return []string{hostname}
	}
}

// 获取ip
func GetIP(c *entitys.CtrlContext)string{
	ip := c.Ctx.Request.RemoteAddr
	end := strings.Index(ip, ":")
	rs := []rune(ip)
	ip = string(rs[0:end])

	return ip
}

//RandomStr 随机生成字符串
func RandomStr(length int) string {
	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	bytes := []byte(str)
	result := []byte{}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < length; i++ {
		result = append(result, bytes[r.Intn(len(bytes))])
	}
	return string(result)
}



/**
 * @brief: empty file
 * @param1 fileName: file name
 * @param3 bytess: content
 * @return1: error info
 */
func AppendFile(fileName string, bytess []byte)error{
	if len(bytess) == 0{
		return nil
	}
	file, err := os.OpenFile(fileName, os.O_CREATE | os.O_WRONLY | os.O_APPEND, os.ModePerm)
	if err != nil{
		return err
	}
	defer file.Close()
	_, err  = file.Write(bytess)
	if err != nil{
		return err
	}
	return nil
}