package route

import (
	"errors"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt"
	"github.com/shockliu/logger"
)

var (
	jwtSecret = []byte("www.cnrehab.cn")
)

type devClaims struct {
	User int `json:"user"` // 用户
	jwt.StandardClaims
}

func CreateToken(user int) string {
	// 生成token
	claims := devClaims{
		User: user,
		StandardClaims: jwt.StandardClaims{
			NotBefore: int64(time.Now().Unix() - 10), // 签名生效时间
			// ExpiresAt: int64(time.Now().Unix() + 14*24*3600), // 签名过期时间
			ExpiresAt: int64(time.Now().Unix() + 6*3600), // 签名过期时间
			Issuer:    "cnrehab.cn",                     // 签名颁发者
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	ts, err := token.SignedString(jwtSecret)
	if err != nil {
		logger.Error(err.Error())
		return ""
	}
	return ts
}

// midware for token-auth
func TokenAuth() gin.HandlerFunc {
	return func(c *gin.Context) {
		ts := c.Request.Header.Get("Token")
		if ts == "" {
			logger.Warnf("请求未携带Token,无访问权限")
			c.JSON(http.StatusOK, gin.H{
				"code": 90001,
				"msg":  "请求未携带Token,无访问权限",
			})
			c.Abort()
			return
		}
		// 解析token
		claims, err := parseToken(ts)
		if err == nil {
			//fmt.Println("ParseToken:",claims)
			c.Set("TK_User", claims.User)
			return
		} else {
			// expired
			logger.Warnf("Token失效,请重新登录")
			logger.Debugf("测试token-1:%s\n", CreateToken(1))
			c.JSON(http.StatusOK, gin.H{
				"code": 90001,
				"msg":  "Token失效,请重新登录",
			})
			c.Abort()
		}
	}
}

/*
   解析token
*/
func parseToken(tokenstring string) (*devClaims, error) {
	token, err := jwt.ParseWithClaims(tokenstring, &devClaims{}, func(token *jwt.Token) (any, error) {
		return jwtSecret, nil
	})
	if err != nil {
		return nil, errors.New("Token不可用")
	}
	if claims, ok := token.Claims.(*devClaims); ok && token.Valid {
		//fmt.Println("ParseToken:",claims,ok)
		return claims, nil
	}
	return nil, errors.New("token无效")
}

func FreshToken(c *gin.Context) {
	user := c.MustGet("TK_User").(int)
	ts := CreateToken(user)
	logger.Debugf("刷新Token成功:%d-%s\n", user, ts)
	c.JSON(http.StatusOK, gin.H{
		"code":  0,
		"token": ts,
	})
}