package CheckHandler

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"strconv"
	"strings"
)

//在注释标签中声明的标识字符串：X-LengthLimit
var lengthLimit = "x-lengthlimit"

//形成一个map,用于O(1)速度获取到一个接口是不是需要进行判断拦截，注意，一个接口可以存在post+get两种形式，所以map里面是一个数组，需要遍历
var lengthLimitMap = make(map[string][]lengthLimitStruct)

//长度限制的map,以string为key(key的命名是接口名+"_get" 或者 接口名+"_post"),里面是lengthLimitStruct形式的数组
type lengthLimitStruct struct {
	parameterName string
	intRange      string
	httpType      string
	must          bool
}

/**
功能：初始化长度限制字典
*/
func lengthLimitInit(inter interface{}) map[string][]lengthLimitStruct {
	//参数检查器
	m := inter.(map[string]interface{})
	n := m["paths"].(map[string]interface{})
	for k, v := range n {
		t := v.(map[string]interface{})
		//参数长度检查器
		var d map[string]interface{}
		if t["get"] != nil {
			lengthLimitaddToMap(t, d, k, "get")
		}
		if t["post"] != nil {
			lengthLimitaddToMap(t, d, k, "post")
		}
	}
	return lengthLimitMap
}

/**
功能：功能函数，添当前的检查字典里
*/
func lengthLimitaddToMap(t map[string]interface{}, d map[string]interface{}, k string, httpType string) {
	var lengthLimitArray []lengthLimitStruct
	d = t[httpType].(map[string]interface{})
	if d != nil && d[lengthLimit] != nil {
		for _, value := range d[lengthLimit].([]interface{}) {
			c := value.(map[string]interface{})
			for k1, v1 := range c {
				var t lengthLimitStruct
				t.parameterName = k1
				t.intRange = v1.(string)
				t.httpType = httpType
				//此参数是否为必填写项
				for _, v2 := range d["parameters"].([]interface{}) {
					c2 := v2.(map[string]interface{})
					for k2, v2 := range c2 {
						if k2 == "required" {
							t.must = v2.(bool) //标识是否是必须项
						}
					}
				}
				lengthLimitArray = append(lengthLimitArray, t)
			}
		}
		lengthLimitMap[k+"_"+httpType] = lengthLimitArray
	}
}

/**
功能：检查字符串长度是否合法
作者：黄海
时间：2020-03-17
*/
func lengthLimitIsLegal(c *gin.Context, interName string) (bool, ResultStruct) {
	var resultStruct ResultStruct
	//接口传入的请求方式:get?post?
	codeHttpType := strings.ToLower(c.Request.Method)
	//1、如果此接口地址需要进行参数长度检查
	if lengthLimitMap[interName+"_"+codeHttpType] != nil {
		resultStruct.InterfaceName = interName
		arr := lengthLimitMap[interName+"_"+codeHttpType]
		//遍历arr
		for i := 0; i < len(arr); i++ {
			parameterName := arr[i].parameterName
			resultStruct.Parameter = arr[i].parameterName
			intRange := arr[i].intRange
			httpType := arr[i].httpType
			var p string
			if httpType == "get" {
				p = c.Query(parameterName)
			} else {
				p = c.PostForm(parameterName)
			}

			//为空，不需要检查，通过
			if p == "" && !arr[i].must {
				return true, resultStruct
			}
			//为空，需要检查，禁止
			if p == "" && arr[i].must{
				resultStruct.Message = "参数没有找到!"
				return false, resultStruct
			}

			var nowInt int
			var err error
			//如果非空，检查是否为整数
			nowInt = len(p)
			//检查是不是在符合的检查范围内
			var rangeArray = strings.Split(intRange, ",")
			if len(rangeArray) != 2 {
				resultStruct.HttpType = httpType
				resultStruct.Message = "注释声明错误，不是两个以逗号分隔的数字,请研发人员检查！"
				return false, resultStruct
			}
			var startStr = rangeArray[0]
			var endStr = rangeArray[1]
			var startInt int
			var stopInt int
			if startInt, err = strconv.Atoi(startStr); err != nil {
				resultStruct.HttpType = httpType
				resultStruct.Message = "起始值无法转化为整数！"
				return false, resultStruct
			}
			if stopInt, err = strconv.Atoi(endStr); err != nil {
				resultStruct.HttpType = httpType
				resultStruct.Message = "终止值无法转化为整数！"
				return false, resultStruct
			}
			if stopInt < startInt {
				resultStruct.HttpType = httpType
				resultStruct.Message = "停止值小于起始佶，请研发人员检查！"
				return false, resultStruct
			}
			if nowInt < startInt || nowInt > stopInt {
				resultStruct.HttpType = httpType
				resultStruct.Message = fmt.Sprintf("不在规定的长度范围内！要求%d-%d,目前参数值:%d", startInt, stopInt, nowInt)
				return false, resultStruct
			}
		}
	}
	return true, resultStruct
}