import (
   "encoding/json"
   "fmt"
   "github.com/tidwall/gjson"
   "reflect"
   "strconv"
   "strings"
)

type Param struct {
   SGameOpenId string
   GameId      int
   Role        struct {
      AreaId int
      PlatId int
      RoleId string
   }
}

func main() {
   requestStr := `{"fields":"{\"openid\":\"SGameOpenId\",\"role_id\":\"Role.RoleId\",\"gameid\":\"GameId\",\"area\":\"Role.AreaId\", \"platid\":\"Role.PlatId#1:10|0:20\"}"}`
   s := gjson.Get(requestStr, "fields").String()

   p := &Param{
      SGameOpenId: "3375000136",
      GameId:      1191,
      Role: struct {
         AreaId int
         PlatId int
         RoleId string
      }{AreaId: 2, PlatId: 1, RoleId: "this role id"},
   }

   getData(s, p)
}

type ProcessingWebParameters struct {
   dataMap map[string]interface{}
}

func getData(str string, req *Param) {
   var m map[string]interface{}
   json.Unmarshal([]byte(str), &m)
   dataMap := make(map[string]interface{}, 0)
   v := reflect.ValueOf(req)
   for s, i := range m {
      if sl := strings.Split(i.(string), "#"); len(sl) > 1 {
         // Role.PlatId#1:10|0:20
         vv, k := actionStruct(sl[0], &v)
         vl := strings.Split(sl[1], "|")
         compareMap := make(map[string]string)
         for _, s2 := range vl {
            ev := strings.Split(s2, ":")
            compareMap[ev[0]] = ev[1]
         }
         // 判斷目標(biāo)類別
         if k == reflect.Int {
            t := strconv.Itoa(vv.(int))
            if value, ok := compareMap[t]; ok {
               dataMap[s], _ = strconv.Atoi(value)
            }
         } else if k == reflect.String {
            if value, ok := compareMap[vv.(string)]; ok {
               dataMap[s], _ = strconv.Atoi(value)
            }
         }

      } else {
         t, _ := actionStruct(i.(string), &v)
         dataMap[s] = t
      }
   }
   fmt.Println(dataMap)
}

func actionStruct(i string, v *reflect.Value) (interface{}, reflect.Kind) {
   var k reflect.Value
   if ss := strings.Split(i, "."); len(ss) > 1 {
      k = v.Elem().FieldByName(ss[0]).FieldByName(ss[1])
   } else {
      k = v.Elem().FieldByName(i)
   }
   return getValue(&k), k.Kind()
}

func getValue(value *reflect.Value) interface{} {
   switch value.Kind() {
   case reflect.Int:
      return int(value.Int())
   case reflect.String:
      return value.String()
   default:

   }
   return ""
}

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