package lmaxapi

import "reflect"
import "fmt"

type structItem struct {
	Offset int
	Align  int
	Size   int
	Name   string
	Value  interface{}
}

func structKV(i interface{}, recursion bool) ([]structItem, error) {
	values := reflect.ValueOf(i)
	if values.Kind() == reflect.Ptr {
		return structKV(values.Elem().Interface(), recursion)
	}
	if values.Kind() != reflect.Struct {
		return nil, fmt.Errorf("StructKeyValues: in params not a struct")
	}
	types := reflect.TypeOf(i)
	num := types.NumField()
	elms := make([]structItem, 0)
	for i := 0; i < num; i++ {
		elm := values.Field(i)
		if elm.CanInterface() {
			if recursion && elm.Kind() == reflect.Struct {
				v, err := structKV(elm.Interface(), recursion)
				if err == nil && len(v) > 0 {
					elms = append(elms, v...)
				}
				continue
			}
			field := types.Field(i)
			item := structItem{}
			item.Offset = int(field.Offset)
			item.Align = int(field.Type.Align())
			item.Size = int(field.Type.Size())
			item.Name = field.Name
			item.Value = elm.Interface()
			elms = append(elms, item)
		}
	}
	return elms, nil
}

func PrintStruct(item interface{}) {
	data, err := structKV(item, true)
	if err != nil {
		panic(err)
	}
	types := reflect.TypeOf(item)
	fmt.Println("name:", types.Name(), "total:", types.Size())
	for i := 0; i < len(data); i++ {
		fmt.Println(data[i])
	}
}