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

package middleware

import (
	"git.getensh.com/common/gopkgs/jwtwrapper"
	"github.com/dgrijalva/jwt-go"
	"github.com/gin-gonic/gin"
	"github.com/tidwall/gjson"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"net/http"
	"strings"
	"time"
	"xingjia-management-gateway/errors"
)

// 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"})
				}
			}

		*/
		userType := gjson.GetBytes([]byte(claims.Subject), "user_type").Int()
		userEnd := gjson.GetBytes([]byte(claims.Subject), "effective_end").Int()
		userStart := gjson.GetBytes([]byte(claims.Subject), "effective_start").Int()
		if userType != 1 && userType != 2 && userType != 3 {
			if v, ok := status.FromError(errors.UserWrong); ok {
				s = v
			}
			c.JSON(http.StatusOK, Response{s.Code(), s.Message()})
			c.Abort()
			return
		}
		if userType == 3 && (userEnd < time.Now().Unix() || userStart > time.Now().Unix()) {
			if v, ok := status.FromError(errors.UserNotEffective); ok {
				s = v
			}
			c.JSON(http.StatusOK, Response{s.Code(), s.Message()})
			c.Abort()
			return
		}
		if userType != 1 {
			// 非超级管理员不能账号管理和日志查看
			if !strings.Contains(c.Request.RequestURI, "/jt/") {
				if v, ok := status.FromError(errors.PermissionError); ok {
					s = v
				}
				c.JSON(http.StatusOK, Response{s.Code(), s.Message()})
				c.Abort()
				return
			}
		}
		// 进行下一次处理
		if gjson.GetBytes([]byte(claims.Subject), "tmp_token").Bool() {
			c.JSON(http.StatusOK, Response{10008, "无效凭据"})
			c.Abort()
		}
		c.Next()
	}
}