package utils

import (
	"fmt"
	"github.com/mitchellh/mapstructure"
	"reflect"
)

func Struct2Map(obj interface{}) map[string]interface{} {
	t := reflect.TypeOf(obj)
	v := reflect.ValueOf(obj)
	if t.Kind() == reflect.Ptr {
		t = t.Elem()
		v = reflect.Indirect(v)
	}
	var data = make(map[string]interface{})
	//func (v Value) NumField() int,  返回v持有的结构体类型值的字段数，如果v的Kind不是Struct会panic
	for i := 0; i < t.NumField(); i++ {
		n := t.Field(i).Name
		vv := v.Field(i).Interface()
		data[Capitalize(n)] = vv
	}
	return data
}

func Map2Struct(obj interface{}, mapInfo map[string]interface{}) interface{} {
	err := mapstructure.Decode(mapInfo, obj)
	if err != nil {
		fmt.Println(err)
	}
	return obj
}

// Capitalize 字符首字母大写
func Capitalize(str string) string {
	var upperStr string
	vv := []rune(str) // 后文有介绍
	for i := 0; i < len(vv); i++ {
		if i == 0 {
			if vv[i] >= 65 && vv[i] <= 96 { // 后文有介绍
				vv[i] += 32 // string的码表相差32位
				upperStr += string(vv[i])
			} else {
				fmt.Println("Not begins with uppercase letter,")
				return str
			}
		} else {
			upperStr += string(vv[i])
		}
	}
	return upperStr
}