package ctx

import (
	"errors"
	"github.com/dgrijalva/jwt-go"
	"pandax/base/config"
	"time"
)

var (
	jwtSecret = []byte(config.Conf.Jwt.Key)
)

type Claims struct {
	UserId   int64
	UserName string
	RoleId   int64
	RoleKey  string
	DeptId   int64
	PostId   int64
	jwt.StandardClaims
}

func CreateToken(claims Claims) (string, error) {

	tokenClaims := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	token, err := tokenClaims.SignedString(jwtSecret)

	return token, err
}

func ParseToken(token string) (*Claims, error) {
	tokenClaims, err := jwt.ParseWithClaims(token, &Claims{}, func(token *jwt.Token) (interface{}, error) {
		return jwtSecret, nil
	})

	if tokenClaims != nil {
		if claims, ok := tokenClaims.Claims.(*Claims); ok && tokenClaims.Valid {
			return claims, nil
		}
	}

	return nil, err
}

// 更新token
func RefreshToken(tokenString string) (string, error) {
	jwt.TimeFunc = func() time.Time {
		return time.Unix(0, 0)
	}
	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
		return jwtSecret, nil
	})
	if err != nil {
		return "", err
	}
	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
		jwt.TimeFunc = time.Now
		claims.StandardClaims.ExpiresAt = time.Now().Add(1 * time.Hour).Unix()
		return CreateToken(*claims)
	}
	return "", errors.New("Couldn't handle this token:")
}