package service

import "github.com/goinggo/mapstructure"

// User 一个用于测试的struct
type User struct {
	ID   int    `json:"id"`
	Name string `json:"name"`
	Age  int    `json:"age"`
}

// MapToStruct map转struct.
// mqtt解析字段直接使用项目通用的json标签
// mqtt传输int会转为string(int)，需要开启 WeaklyTypedInput
func MapToStruct(m interface{}, structPointer interface{}) error {
	// https://godoc.org/github.com/mitchellh/mapstructure#DecoderConfig
	config := &mapstructure.DecoderConfig{
		TagName:          "json",
		Result:           structPointer,
		WeaklyTypedInput: true,
	}
	newDecode, _ := mapstructure.NewDecoder(config)

	if err := newDecode.Decode(m); err != nil {
		return err
	}
	return nil
}