package common

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"time"
)

import (
	"github.com/golang-jwt/jwt/v5"
	"github.com/spf13/cast"
)

var CstSh, _ = time.LoadLocation("Asia/Shanghai")

const (
	LocateDateFormat  = "2006-01-02"
	LocateTimeFormat  = "2006-01-02 15:04:05"
	LocateMilliFormat = "2006-01-02 15:04:05.9999"
)

func Date() string {
	return time.Now().In(CstSh).Format(LocateDateFormat)
}

func Now() string {
	return time.Now().In(CstSh).Format(LocateTimeFormat)
}

func NowMilli() string {
	return time.Now().In(CstSh).Format(LocateMilliFormat)
}

func NewToken(userId uint, name string) (string, int64, error) {
	expire := time.Now().AddDate(0, 1, 0)
	hmacSampleSecret := []byte(BasicConfig.Jwt)
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"id":   userId,
		"name": name,
		"exp":  expire.Unix(),
	})
	str, err := token.SignedString(hmacSampleSecret)
	return str, expire.Unix(), err
}

func ParseToken(tokenString string) (uint, string, error) {
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
		}
		return []byte(BasicConfig.Jwt), nil
	})
	if err != nil {
		return 0, "", err
	}
	claims := token.Claims.(jwt.MapClaims)
	return cast.ToUint(claims["id"]), claims["name"].(string), nil
}

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