// Copyright 2020 github.com. All rights reserved.
// Use of this source code is governed by github.com.

package middleware

import (
	"net/http"
	"smart-enterprise-management-gateway/errors"
	"github.com/dgrijalva/jwt-go"
	"github.com/gin-gonic/gin"
	"github.com/jaryhe/gopkgs/jwtwrapper"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// 响应数据
type Response struct {
	Code    codes.Code `json:"code" default:"1"`
	Message string     `json:"message" default:"success"`
}

// JWT is jwt middleware
func Jwt() gin.HandlerFunc {
	return func(c *gin.Context) {
		s := status.New(1, "内部服务错误")
		token := c.GetHeader("token")
		if token == "" {
			if v, ok := status.FromError(errors.NoTokenError); ok {
				s = v
			}
			c.JSON(http.StatusOK, Response{s.Code(), s.Message()})
			c.Abort()
			return
		}

		// 解析token
		claims, err := jwtwrapper.ParseToken(token)
		if err != nil {
			switch err.(*jwt.ValidationError).Errors {
			case jwt.ValidationErrorExpired:
				if v, ok := status.FromError(errors.TokenExpiredError); ok {
					s = v
				}
			default:
				if v, ok := status.FromError(errors.TokenFailedError); ok {
					s = v
				}
			}

			c.JSON(http.StatusOK, Response{s.Code(), s.Message()})
			c.Abort()
			return
		}

		// 将claims信息保存到上下文，为后续使用
		c.Set("claims", claims)
/*
		supper := gjson.GetBytes(utils.StrToBytes(claims.Subject), "supper").Bool()
		if c.Request.Method == "PUT" || c.Request.Method == "POST" || c.Request.Method == "DELETE" {
			if supper == false && strings.Contains(c.Request.RequestURI, "/user") == false {
				c.JSON(http.StatusOK, Response{10008, "权限不足"})
			}
		}
*/
		// 进行下一次处理
		c.Next()
	}
}