package utils

import (
	"bufio"
	"crypto/md5"
	"crypto/sha1"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"image"
	"image/png"
	"io"
	"math"
	"math/rand"
	"net/http"
	"os"
	"os/exec"
	"path"
	"regexp"
	"strconv"
	"strings"
	"time"
)

//随机数种子
var rnd = rand.New(rand.NewSource(time.Now().UnixNano()))

func GetRandString(size int) string {
	allLetterDigit := []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "!", "@", "#", "$", "%", "^", "&", "*"}
	randomSb := ""
	digitSize := len(allLetterDigit)
	for i := 0; i < size; i++ {
		randomSb += allLetterDigit[rnd.Intn(digitSize)]
	}
	return randomSb
}

func GetRandStringNoSpecialChar(size int) string {
	allLetterDigit := []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}
	randomSb := ""
	digitSize := len(allLetterDigit)
	for i := 0; i < size; i++ {
		randomSb += allLetterDigit[rnd.Intn(digitSize)]
	}
	return randomSb
}

func StringsToJSON(str string) string {
	rs := []rune(str)
	jsons := ""
	for _, r := range rs {
		rint := int(r)
		if rint < 128 {
			jsons += string(r)
		} else {
			jsons += "\\u" + strconv.FormatInt(int64(rint), 16) // json
		}
	}
	return jsons
}

//序列化
func ToString(v interface{}) string {
	data, _ := json.Marshal(v)
	return string(data)
}

//md5加密
func MD5(data string) string {
	m := md5.Sum([]byte(data))
	return hex.EncodeToString(m[:])
}

// 获取数字随机字符
func GetRandDigit(n int) string {
	return fmt.Sprintf("%0"+strconv.Itoa(n)+"d", rnd.Intn(int(math.Pow10(n))))
}

// 获取随机数
func GetRandNumber(n int) int {
	return rnd.Intn(n)
}

func GetRandInt(min, max int) int {
	if min >= max || min == 0 || max == 0 {
		return max
	}
	return rand.Intn(max-min) + min
}

func GetToday(format string) string {
	today := time.Now().Format(format)
	return today
}

//获取今天剩余秒数
func GetTodayLastSecond() time.Duration {
	today := GetToday(FormatDate) + " 23:59:59"
	end, _ := time.ParseInLocation(FormatDateTime, today, time.Local)
	return time.Duration(end.Unix()-time.Now().Local().Unix()) * time.Second
}

// 处理出生日期函数
func GetBrithDate(idcard string) string {
	l := len(idcard)
	var s string
	if l == 15 {
		s = "19" + idcard[6:8] + "-" + idcard[8:10] + "-" + idcard[10:12]
		return s
	}
	if l == 18 {
		s = idcard[6:10] + "-" + idcard[10:12] + "-" + idcard[12:14]
		return s
	}
	return GetToday(FormatDate)
}

//处理性别
func WhichSexByIdcard(idcard string) string {
	var sexs = [2]string{"女", "男"}
	length := len(idcard)
	if length == 18 {
		sex, _ := strconv.Atoi(string(idcard[16]))
		return sexs[sex%2]
	} else if length == 15 {
		sex, _ := strconv.Atoi(string(idcard[14]))
		return sexs[sex%2]
	}
	return "男"
}

//截取小数点后几位
func SubFloatToString(f float64, m int) string {
	n := strconv.FormatFloat(f, 'f', -1, 64)
	if n == "" {
		return ""
	}
	if m >= len(n) {
		return n
	}
	newn := strings.Split(n, ".")
	if m == 0 {
		return newn[0]
	}
	if len(newn) < 2 || m >= len(newn[1]) {
		return n
	}
	return newn[0] + "." + newn[1][:m]
}

//截取小数点后几位
func SubFloatToFloat(f float64, m int) float64 {
	newn := SubFloatToString(f, m)
	newf, _ := strconv.ParseFloat(newn, 64)
	return newf
}

//截取小数点后几位
func SubFloatToFloatStr(f float64, m int) string {
	newn := SubFloatToString(f, m)
	return newn
}

//获取相差时间-年
func GetYearDiffer(start_time, end_time string) int {
	t1, _ := time.ParseInLocation("2006-01-02", start_time, time.Local)
	t2, _ := time.ParseInLocation("2006-01-02", end_time, time.Local)
	age := t2.Year() - t1.Year()
	if t2.Month() < t1.Month() || (t2.Month() == t1.Month() && t2.Day() < t1.Day()) {
		age--
	}
	return age
}

//获取相差时间-秒
func GetSecondDifferByTime(start_time, end_time time.Time) int64 {
	diff := end_time.Unix() - start_time.Unix()
	return diff
}

func FixFloat(f float64, m int) float64 {
	newn := SubFloatToString(f+0.00000001, m)
	newf, _ := strconv.ParseFloat(newn, 64)
	return newf
}

// 将字符串数组转化为逗号分割的字符串形式  ["str1","str2","str3"] >>> "str1,str2,str3"
func StrListToString(strList []string) (str string) {
	if len(strList) > 0 {
		for k, v := range strList {
			if k == 0 {
				str = v
			} else {
				str = str + "," + v
			}
		}
		return
	}
	return ""
}

//Token
func GetToken() string {
	randStr := GetRandString(64)
	token := MD5(randStr + Md5Key)
	tokenLen := 64 - len(token)
	return strings.ToUpper(token + GetRandString(tokenLen))
}

//数据没有记录
func ErrNoRow() string {
	return "<QuerySeter> no row found"
}

//校验邮箱格式
func ValidateEmailFormatat(email string) bool {
	reg := regexp.MustCompile(RegularEmail)
	return reg.MatchString(email)
}

//验证是否是手机号
func ValidateMobileFormatat(mobileNum string) bool {
	reg := regexp.MustCompile(RegularMobile)
	return reg.MatchString(mobileNum)
}

//判断文件是否存在
func FileIsExist(filePath string) bool {
	_, err := os.Stat(filePath)
	return err == nil || os.IsExist(err)
}

//获取图片扩展名
func GetImgExt(file string) (ext string, err error) {
	var headerByte []byte
	headerByte = make([]byte, 8)
	fd, err := os.Open(file)
	if err != nil {
		return "", err
	}
	defer fd.Close()
	_, err = fd.Read(headerByte)
	if err != nil {
		return "", err
	}
	xStr := fmt.Sprintf("%x", headerByte)
	switch {
	case xStr == "89504e470d0a1a0a":
		ext = ".png"
	case xStr == "0000010001002020":
		ext = ".ico"
	case xStr == "0000020001002020":
		ext = ".cur"
	case xStr[:12] == "474946383961" || xStr[:12] == "474946383761":
		ext = ".gif"
	case xStr[:10] == "0000020000" || xStr[:10] == "0000100000":
		ext = ".tga"
	case xStr[:8] == "464f524d":
		ext = ".iff"
	case xStr[:8] == "52494646":
		ext = ".ani"
	case xStr[:4] == "4d4d" || xStr[:4] == "4949":
		ext = ".tiff"
	case xStr[:4] == "424d":
		ext = ".bmp"
	case xStr[:4] == "ffd8":
		ext = ".jpg"
	case xStr[:2] == "0a":
		ext = ".pcx"
	default:
		ext = ""
	}
	return ext, nil
}

//保存图片
func SaveImage(path string, img image.Image) (err error) {
	//需要保持的文件
	imgfile, err := os.Create(path)
	defer imgfile.Close()
	// 以PNG格式保存文件
	err = png.Encode(imgfile, img)
	return err
}

//下载图片
func DownloadImage(imgUrl string) (filePath string, err error) {
	imgPath := "./static/imgs/"
	fileName := path.Base(imgUrl)
	res, err := http.Get(imgUrl)
	if err != nil {
		fmt.Println("A error occurred!")
		return
	}
	defer res.Body.Close()
	// 获得get请求响应的reader对象
	reader := bufio.NewReaderSize(res.Body, 32*1024)

	filePath = imgPath + fileName
	file, err := os.Create(filePath)
	if err != nil {
		return
	}
	// 获得文件的writer对象
	writer := bufio.NewWriter(file)

	written, _ := io.Copy(writer, reader)
	fmt.Printf("Total length: %d \n", written)
	return
}

//保存base64数据为文件
func SaveBase64ToFile(content, path string) error {
	data, err := base64.StdEncoding.DecodeString(content)
	if err != nil {
		return err
	}
	f, err := os.Create(path)
	defer f.Close()
	if err != nil {
		return err
	}
	f.Write(data)
	return nil
}

func SaveBase64ToFileBySeek(content, path string) (err error) {
	data, err := base64.StdEncoding.DecodeString(content)
	exist, err := PathExists(path)
	if err != nil {
		return
	}
	if !exist {
		f, err := os.Create(path)
		if err != nil {
			return err
		}
		n, _ := f.Seek(0, 2)
		// 从末尾的偏移量开始写入内容
		_, err = f.WriteAt([]byte(data), n)
		defer f.Close()
	} else {
		f, err := os.OpenFile(path, os.O_WRONLY, 0644)
		if err != nil {
			return err
		}
		n, _ := f.Seek(0, 2)
		// 从末尾的偏移量开始写入内容
		_, err = f.WriteAt([]byte(data), n)
		defer f.Close()
	}

	return nil
}

func PathExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func StartIndex(page, pagesize int) int {
	if page > 1 {
		return (page - 1) * pagesize
	}
	return 0
}
func PageCount(count, pagesize int) int {
	if count%pagesize > 0 {
		return count/pagesize + 1
	} else {
		return count / pagesize
	}
}

func TrimHtml(src string) string {
	//将HTML标签全转换成小写
	re, _ := regexp.Compile("\\<[\\S\\s]+?\\>")
	src = re.ReplaceAllStringFunc(src, strings.ToLower)

	re, _ = regexp.Compile("\\<img[\\S\\s]+?\\>")
	src = re.ReplaceAllString(src, "[图片]")

	re, _ = regexp.Compile("class[\\S\\s]+?>")
	src = re.ReplaceAllString(src, "")
	re, _ = regexp.Compile("\\<[\\S\\s]+?\\>")
	src = re.ReplaceAllString(src, "")
	return strings.TrimSpace(src)
}

//1556164246  ->  2019-04-25 03:50:46 +0000
//timestamp

func TimeToTimestamp() {
	fmt.Println(time.Unix(1556164246, 0).Format("2006-01-02 15:04:05"))
}

func ToUnicode(text string) string {
	textQuoted := strconv.QuoteToASCII(text)
	textUnquoted := textQuoted[1 : len(textQuoted)-1]
	return textUnquoted
}

func VersionToInt(version string) int {
	version = strings.Replace(version, ".", "", -1)
	n, _ := strconv.Atoi(version)
	return n
}
func IsCheckInList(list []int, s int) bool {
	for _, v := range list {
		if v == s {
			return true
		}
	}
	return false

}

func round(num float64) int {
	return int(num + math.Copysign(0.5, num))
}

func toFixed(num float64, precision int) float64 {
	output := math.Pow(10, float64(precision))
	return float64(round(num*output)) / output
}

// GetWilsonScore returns Wilson Score
func GetWilsonScore(p, n float64) float64 {
	if p == 0 && n == 0 {
		return 0
	}

	return toFixed(((p+1.9208)/(p+n)-1.96*math.Sqrt(p*n/(p+n)+0.9604)/(p+n))/(1+3.8416/(p+n)), 2)
}

//将中文数字转化成数字，比如 第三百四十五章，返回第345章 不支持一亿及以上
func ChangeWordsToNum(str string) (numStr string) {
	words := ([]rune)(str)
	num := 0
	n := 0
	for i := 0; i < len(words); i++ {
		word := string(words[i : i+1])
		switch word {
		case "万":
			if n == 0 {
				n = 1
			}
			n = n * 10000
			num = num*10000 + n
			n = 0
		case "千":
			if n == 0 {
				n = 1
			}
			n = n * 1000
			num += n
			n = 0
		case "百":
			if n == 0 {
				n = 1
			}
			n = n * 100
			num += n
			n = 0
		case "十":
			if n == 0 {
				n = 1
			}
			n = n * 10
			num += n
			n = 0
		case "一":
			n += 1
		case "二":
			n += 2
		case "三":
			n += 3
		case "四":
			n += 4
		case "五":
			n += 5
		case "六":
			n += 6
		case "七":
			n += 7
		case "八":
			n += 8
		case "九":
			n += 9
		case "零":
		default:
			if n > 0 {
				num += n
				n = 0
			}
			if num == 0 {
				numStr += word
			} else {
				numStr += strconv.Itoa(num) + word
				num = 0
			}
		}
	}
	if n > 0 {
		num += n
		n = 0
	}
	if num != 0 {
		numStr += strconv.Itoa(num)
	}
	return
}

func Sha1(data string) string {
	sha1 := sha1.New()
	sha1.Write([]byte(data))
	return hex.EncodeToString(sha1.Sum([]byte("")))
}

func GetVideoPlaySeconds(videoPath string) (playSeconds float64, err error) {
	cmd := `ffmpeg -i ` + videoPath + `  2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//`
	out, err := exec.Command("bash", "-c", cmd).Output()
	if err != nil {
		return
	}
	outTimes := string(out)
	fmt.Println("outTimes:", outTimes)
	if outTimes != "" {
		timeArr := strings.Split(outTimes, ":")
		h := timeArr[0]
		m := timeArr[1]
		s := timeArr[2]
		hInt, err := strconv.Atoi(h)
		if err != nil {
			return playSeconds, err
		}

		mInt, err := strconv.Atoi(m)
		if err != nil {
			return playSeconds, err
		}
		s = strings.Trim(s, " ")
		s = strings.Trim(s, "\n")
		sInt, err := strconv.ParseFloat(s, 64)
		if err != nil {
			return playSeconds, err
		}
		playSeconds = float64(hInt)*3600 + float64(mInt)*60 + float64(sInt)
	}
	return
}

func GetMaxTradeCode(tradeCode string) (maxTradeCode string, err error) {
	tradeCode = strings.Replace(tradeCode, "W", "", -1)
	tradeCode = strings.Trim(tradeCode, " ")
	tradeCodeInt, err := strconv.Atoi(tradeCode)
	if err != nil {
		return
	}
	tradeCodeInt = tradeCodeInt + 1
	maxTradeCode = fmt.Sprintf("W%06d", tradeCodeInt)
	return
}

// excel日期字段格式化 yyyy-mm-dd
func ConvertToFormatDay(excelDaysString string) string {
	// 2006-01-02 距离 1900-01-01的天数
	baseDiffDay := 38719 //在网上工具计算的天数需要加2天，什么原因没弄清楚
	curDiffDay := excelDaysString
	b, _ := strconv.Atoi(curDiffDay)
	// 获取excel的日期距离2006-01-02的天数
	realDiffDay := b - baseDiffDay
	//fmt.Println("realDiffDay:",realDiffDay)
	// 距离2006-01-02 秒数
	realDiffSecond := realDiffDay * 24 * 3600
	//fmt.Println("realDiffSecond:",realDiffSecond)
	// 2006-01-02 15:04:05距离1970-01-01 08:00:00的秒数 网上工具可查出
	baseOriginSecond := 1136185445
	resultTime := time.Unix(int64(baseOriginSecond+realDiffSecond), 0).Format("2006-01-02")
	return resultTime
}

func CheckPwd(pwd string) bool {
	compile := `([0-9a-z]+){6,12}|(a-z0-9]+){6,12}`
	reg := regexp.MustCompile(compile)
	flag := reg.MatchString(pwd)
	return flag
}

func GetMonthStartAndEnd(myYear string, myMonth string) (startDate, endDate string) {
	// 数字月份必须前置补零
	if len(myMonth) == 1 {
		myMonth = "0" + myMonth
	}
	yInt, _ := strconv.Atoi(myYear)

	timeLayout := "2006-01-02 15:04:05"
	loc, _ := time.LoadLocation("Local")
	theTime, _ := time.ParseInLocation(timeLayout, myYear+"-"+myMonth+"-01 00:00:00", loc)
	newMonth := theTime.Month()

	t1 := time.Date(yInt, newMonth, 1, 0, 0, 0, 0, time.Local).Format("2006-01-02")
	t2 := time.Date(yInt, newMonth+1, 0, 0, 0, 0, 0, time.Local).Format("2006-01-02")
	return t1, t2
}

//移除字符串中的空格
func TrimStr(str string) (str2 string) {
	return strings.Replace(str, " ", "", -1)
}

//字符串转换为time
func StrTimeToTime(strTime string) time.Time {
	timeLayout := "2006-01-02 15:04:05"  //转化所需模板
	loc, _ := time.LoadLocation("Local") //重要：获取时区
	resultTime, _ := time.ParseInLocation(timeLayout, strTime, loc)
	return resultTime
}

// GetOrmInReplace 获取orm的in查询替换?的方法
func GetOrmInReplace(num int) string {
	template := make([]string, num)
	for i := 0; i < num; i++ {
		template[i] = "?"
	}
	return strings.Join(template, ",")
}

// RevSlice 反转切片
func RevSlice(slice []int) []int {
	for i, j := 0, len(slice)-1; i < j; i, j = i+1, j-1 {
		slice[i], slice[j] = slice[j], slice[i]
	}
	return slice
}

// GetTimeSubDay 计算两个时间的自然日期差
func GetTimeSubDay(t1, t2 time.Time) int {
	var day int
	swap := false
	if t1.Unix() > t2.Unix() {
		t1, t2 = t2, t1
		swap = true
	}

	t1_ := t1.Add(time.Duration(t2.Sub(t1).Milliseconds()%86400000) * time.Millisecond)
	day = int(t2.Sub(t1).Hours() / 24)
	// 计算在t1+两个时间的余数之后天数是否有变化
	if t1_.Day() != t1.Day() {
		day += 1
	}

	if swap {
		day = -day
	}

	return day
}

// MapSorter 对于map 排序
type MapSorter []Item

type Item struct {
	Key int
	Val float64
}

func NewMapSorter(m map[int]float64) MapSorter {
	ms := make(MapSorter, 0, len(m))
	for k, v := range m {
		ms = append(ms, Item{k, v})
	}
	return ms
}

func (ms MapSorter) Len() int {
	return len(ms)
}

func (ms MapSorter) Less(i, j int) bool {
	return ms[i].Val > ms[j].Val // 按值排序
	//return ms[i].Key < ms[j].Key // 按键排序
}

func (ms MapSorter) Swap(i, j int) {
	ms[i], ms[j] = ms[j], ms[i]
}