package utils

import (
	"time"

	"github.com/golang-jwt/jwt/v4"
)

type Claims struct {
	UserId int64 `json:"user_id"`
	jwt.RegisteredClaims
}

const TokenExpireDuration = time.Hour * 24 * 7 // token有效期7天

var Secret = []byte("your-secret-key") // 实际使用时应该从配置文件读取

// GenerateToken 生成JWT
func GenerateToken(userId int64) (string, error) {
	claims := Claims{
		UserId: userId,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(TokenExpireDuration)),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
			NotBefore: jwt.NewNumericDate(time.Now()),
		},
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString(Secret)
}