package utils

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

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")
)

var (
	idCertMatrix       = []int{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2}
	idCertVerifyCode   = []byte("10X98765432")
	socialCreditMatrix = []int{1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28}
	socialCreditMap    = map[int]int{'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
		'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15, 'G': 16, 'H': 17, 'J': 18,
		'K': 19, 'L': 20, 'M': 21, 'N': 22, 'P': 23, 'Q': 24, 'R': 25, 'T': 26, 'U': 27,
		'W': 28, 'X': 29, 'Y': 30}

	socialCreditMapKeys   = []int{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'T', 'U', 'W', 'X', 'Y'}
	socialCreditMapValues = []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30}
)

const DAYSECOND = 24 * 60 * 60
const MINUTESECOND = 60

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 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)
}

//身份证
func CheckIDCert(str string) (res bool) {

	defer func() {
		if r := recover(); r != nil {
			res = false
		}
	}()

	idCert := strings.ToUpper(str)
	if len(idCert) != 18 {
		return false
	}

	year, err := strconv.Atoi(idCert[6:10])

	if err != nil {
		return false
	}

	if !(1900 < year && year < 2100) {
		return false
	}

	check := 0
	lastLetter := 0
	for index, value := range []byte(idCert) {
		if index == 17 {
			lastLetter = int(value)
			break
		}

		if !(value >= 48 && value <= 57) {
			return false
		}

		v := value - 48
		check = check + idCertMatrix[index]*int(v)
	}

	if !((lastLetter >= 48 && lastLetter <= 57) || lastLetter == 'X') {
		return false
	}

	timeLayout := "20060102"                                     //转化所需模板
	loc, _ := time.LoadLocation("Local")                         //重要：获取时区
	_, err = time.ParseInLocation(timeLayout, idCert[6:14], loc) //使用模板在对应时区转化为time.time类型

	if err != nil {
		return false
	}

	verifyCode := int(idCertVerifyCode[check%11])
	if lastLetter == verifyCode {
		return true
	}
	return false
}

func IsReuseTime(reuseTime int64, timestamp int64) bool {
	if timestamp == 0 {
		return false
	}
	reuseSencod := reuseTime * DAYSECOND

	t := time.Unix(timestamp, 0)
	now := time.Now()

	// 60s短时复用
	if reuseTime == 0 {
		if now.Unix()-timestamp > MINUTESECOND {
			return false
		}
		return true
	}

	start := time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location()).Unix()
	end := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location()).Unix()
	if end-start >= reuseSencod {
		return false
	}
	return true
}

// 时间字符串转化成时间戳
func TimeStringToTs(s string) int64 {
	location, _ := time.ParseInLocation("2006-01-02", s, time.Local)
	return location.Unix()
}