package JWT

import (
	"encoding/json"
	"errors"
	"github.com/dgrijalva/jwt-go"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"letu/Config"
	"letu/DB"
	"time"
)

func CreateToken(user *DB.SMember, exp int64) (tokenss string, err error) {
	//自定义claim

	auth, _ := json.Marshal(user.Auth)
	claim := jwt.MapClaims{
		"id":       user.Id,
		"username": user.Username,
		"userType": user.UserType,
		"scenicId": user.ScenicId,
		"auth":     string(auth),
		"nbf":      time.Now().Unix(),
		"iat":      time.Now().Unix(),
		"exp":      exp,
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claim)
	tokenss, err = token.SignedString([]byte(Config.Info.TokenSecret))
	return
}

func secret() jwt.Keyfunc {
	return func(token *jwt.Token) (interface{}, error) {
		return []byte(Config.Info.TokenSecret), nil
	}
}

func CheckToken(tokenss string) (err error) {

	_, err = jwt.Parse(tokenss, secret())
	return err
}

func ParseToken(tokenss string) (user *DB.SMember, err error) {
	user = &DB.SMember{}
	token, err := jwt.Parse(tokenss, secret())
	if err != nil {
		return
	}
	claim, ok := token.Claims.(jwt.MapClaims)
	if !ok {
		err = errors.New("cannot convert claim to mapclaim")
		return
	}
	//验证token，如果token被修改过则为false
	if !token.Valid {
		err = errors.New("token is invalid")
		return
	}

	id, _ := primitive.ObjectIDFromHex(claim["id"].(string))
	user.Id = &id
	user.Username = claim["username"].(string)
	user.UserType = claim["userType"].(string)
	user.ScenicId = claim["scenicId"].(string)

	var jsons []string
	json.Unmarshal([]byte(claim["auth"].(string)), &jsons)
	user.Auth = jsons
	return
}