package utils

import (
	"crypto/md5"
	"crypto/sha1"
	"crypto/sha256"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"math/rand"
	"net"
	"os"
	"reflect"
	"regexp"
	"strconv"
	"strings"
	"time"
	"unicode"
)

var (
	DB_QUERY_WHERE_EMPTY = errors.New("where is empty")
	DB_RECORD_NOT_EXISTS = errors.New("record is not exists")
	DB_DUPLICATE         = errors.New("database duplicate")
)

func GetUniqueLogID(cmd string) string {
	return fmt.Sprintf("%d_%s", time.Now().Unix(), cmd)
}

// 获取偏移天数的某天的某个时刻的时间戳
func GetTimestampInOffsetDay(offsetDay, hour, min, sec int) int64 {
	nowTime := time.Now()

	todayZeroTime := time.Date(nowTime.Year(), nowTime.Month(), nowTime.Day(), 0, 0, 0, 0, time.Local)
	offsetDayZeroTime := todayZeroTime.AddDate(0, 0, offsetDay)

	return offsetDayZeroTime.Unix() + int64(hour*3600+min*60+sec)
}

func BeToday(ts int64) bool {
	theTime := time.Unix(ts, 0)
	nowTime := time.Now()

	// 年、月、日都相同，则是同一天
	return (theTime.Year() == nowTime.Year() && theTime.Month() == nowTime.Month() && theTime.Day() == nowTime.Day())
}

// 获取某个时间戳的0点时间戳、24点时间戳、日期
func Get0_24TimestampAndDate(ts int64) (ts0, ts24 int64, date string) {
	theTime := time.Unix(ts, 0)

	theZeroTime := time.Date(theTime.Year(), theTime.Month(), theTime.Day(), 0, 0, 0, 0, time.Local)

	ts0 = theZeroTime.Unix()                   // 0点时间戳
	ts24 = theZeroTime.AddDate(0, 0, 1).Unix() // 24点时间戳
	date = theZeroTime.Format("2006-01-02")    // 日期

	return
}

// 获取args对应的json字符串
func MarshalJsonString(args ...interface{}) (result string) {
	if len(args) > 0 {
		if r, err := json.Marshal(args); err == nil {
			result = string(r)
		}
	}

	return
}

func GetStructNotZeroField(arg interface{}) []string {
	v := reflect.ValueOf(arg)
	if v.Kind() == reflect.Ptr {
		v = v.Elem()
	}
	result := make([]string, 0)
	if v.Kind() == reflect.Struct {
		numField := v.NumField()
		for i := 0; i < numField; i++ {
			if !reflect.DeepEqual(v.Field(i).Interface(), reflect.Zero(v.Field(i).Type()).Interface()) {
				result = append(result, v.Type().Field(i).Name)
			}
		}
	}
	return result
}

// 生成订单号
func GenOrderNO(orderType int) string {
	nowTime := time.Now()
	nowDate := nowTime.Format("20060102")
	ym := string([]byte(nowDate)[3:6])
	d := string([]byte(nowDate)[6:])
	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	return fmt.Sprintf("%d%s%d%s%05d", orderType, ym, r.Intn(10), d, r.Intn(10000))
}

func GetRuneSubstring(src string, start, length int) string {
	rs := []rune(src)
	rl := len(rs)
	end := 0

	if start < 0 {
		start = rl - 1 + start
	}
	end = start + length

	if start > end {
		start, end = end, start
	}

	if start < 0 {
		start = 0
	}
	if start > rl {
		start = rl
	}
	if end < 0 {
		end = 0
	}
	if end > rl {
		end = rl
	}
	return string(rs[start:end])
}

func MD5(text string) string {
	h := md5.New()
	h.Write([]byte(text))
	return hex.EncodeToString(h.Sum(nil))
}

func SHA256(text string) string {
	h := sha256.New()
	h.Write([]byte(text))
	return hex.EncodeToString(h.Sum(nil))
}

func GetEnv(name string) string {
	value := os.Getenv(name)
	if value == "" {
		fmt.Printf(`hasn't %s env var\n`, name)
		os.Exit(1)
	}
	return value
}

func Base64URLDecode(data string) ([]byte, error) {
	var missing = (4 - len(data)%4) % 4
	data += strings.Repeat("=", missing)
	return base64.URLEncoding.DecodeString(data)
}

func Base64UrlSafeEncode(source []byte) string {
	// Base64 Url Safe is the same as Base64 but does not contain '/' and '+' (replaced by '_' and '-') and trailing '=' are removed.
	bytearr := base64.StdEncoding.EncodeToString(source)
	safeurl := strings.Replace(string(bytearr), "/", "_", -1)
	safeurl = strings.Replace(safeurl, "+", "-", -1)
	safeurl = strings.Replace(safeurl, "=", "", -1)
	return safeurl
}

//生成reportId 唯一标识
func GenReportID(module string) string {
	macAddr := ""
	for _, addr := range macAddrs() {
		macAddr += addr
	}

	if macAddr == "" {
		macAddr = RandomString(10)
	}

	reportId := macAddr + module + strconv.FormatInt(time.Now().UnixNano(), 10)
	return MD5(reportId)
}

func macAddrs() (macAddrs []string) {
	netInterfaces, err := net.Interfaces()
	if err != nil {
		return macAddrs
	}

	for _, netInterface := range netInterfaces {
		macAddr := netInterface.HardwareAddr.String()
		if len(macAddr) == 0 {
			continue
		}

		macAddrs = append(macAddrs, macAddr)
	}
	return macAddrs
}

//根据length获取随机字符串
func RandomString(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)
}

func ParsePlate(plate string) (string, string) {
	var index int
	for i, r := range plate {
		if !unicode.Is(unicode.Scripts["Han"], r) {
			index = i
			break
		}
	}
	sf := plate[0:index]
	hphm := plate[index:]

	return sf, hphm
}

func MobileVerify(number string) bool {
	regular := `^1([38][0-9]|14[57]|5[^4])\d{8}$`
	reg := regexp.MustCompile(regular)
	return reg.MatchString(number)
}

func CheckPlate(plate string, plateType string) (string, error) {
	var index int
	plate = strings.Replace(plate, " ", "", -1)
	for i, r := range plate {
		if !unicode.Is(unicode.Scripts["Han"], r) {
			index = i
			break
		}
	}
	if index != 3 {
		return "", errors.New("车牌格式错误")
	}
	if len(plate[index:]) != 6 && len(plate[index:]) != 7 {
		return "", errors.New("车牌格式错误")
	}
	if len((plate[index:])) == 7 {
		if plateType != "51" && plateType != "52" && plateType != "" {
			return "", errors.New("车牌格式错误")
		}
	}
	return plate, nil
}

func CheckVin(vin string) (string, error) {
	vin = strings.Replace(vin, " ", "", -1)
	if len(vin) != 17 {
		return "", errors.New("vin码格式错误")
	}
	return vin, nil
}

// 判断是否在字符串数组中
func InStrArr(arr []string, verify string) bool {
	for _, v := range arr {
		if v == verify {
			return true
		}
	}

	return false
}

func LimiterEnCode(s string) string {
	h := sha1.New()
	h.Write([]byte(s))

	return hex.EncodeToString(h.Sum(nil))[:8]
}