package utils

import (
	"reflect"
	"strings"
)

// StructToMapJson struct to map json tag
func StructToMapJson(obj interface{}) map[string]interface{} {
	t := reflect.TypeOf(obj)
	v := reflect.ValueOf(obj)
	var data = make(map[string]interface{})
	for i := 0; i < t.NumField(); i++ {
		jsonKey := t.Field(i).Tag.Get("json")
		if jsonKey != "-" {
			// tagName, tagOpts
			tagName, _ := parseTags(jsonKey)
			data[tagName] = v.Field(i).Interface()
		}
	}
	return data
}

// parseTags "age,omitempty"
func parseTags(s string) (string, []string) {
	if len(s) == 0 {
		return "", nil
	}

	sl := strings.Split(s, ",")
	return sl[0], sl[1:]
}