package jwt

import (
	"errors"
	"github.com/exhibition-main/internal/msg"
	"time"

	"github.com/spf13/viper"

	"github.com/dgrijalva/jwt-go"
)

var mySecret = []byte(viper.GetString("jwt.key"))

type MyClaims struct {
	UserId   int64  `json:"userId"`
	Nickname string `json:"nickname"`
	Phone    string `json:"phone"`
	Openid   string `json:"openid"`
	jwt.StandardClaims
}

// GenToken 生成JWT
func GenToken(userId int64, nickname string, phone string, openid string) (string, error) {
	// 创建一个我们自己的声明的数据
	c := MyClaims{
		userId,
		nickname,
		phone,
		openid,
		jwt.StandardClaims{
			ExpiresAt: time.Now().Add(
				time.Duration(viper.GetInt("jwt.expire")) * time.Hour).Unix(),
			Issuer: "meal",
		},
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, c)
	return token.SignedString(mySecret)
}

// ParseToken 解析JWT
func ParseToken(tokenString string) (*MyClaims, error) {
	// 解析token
	var mc = new(MyClaims)
	token, err := jwt.ParseWithClaims(tokenString, mc, func(token *jwt.Token) (i interface{}, err error) {
		return mySecret, nil
	})
	if err != nil {
		return nil, err
	}
	if token.Valid { // 校验token
		return mc, nil
	}
	return nil, errors.New(msg.INVALID_TOKEN)
}