package utils

import (
	"bytes"
	"encoding/json"
	"encoding/xml"
	"golang.org/x/net/html/charset"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"
	"io/ioutil"
)

func ToJSONString(v interface{}) string {
	b, _ := json.Marshal(v)
	return string(b)
}

func ToPrettyString(v interface{}) string {
	b, _ := json.MarshalIndent(v, "", "    ")
	return string(b)
}

func GbkToUtf8(s []byte) ([]byte, error) {
	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewDecoder())
	d, e := ioutil.ReadAll(reader)
	if e != nil {
		return s, e
	}
	return d, nil
}

func DecodeGbk(v interface{}, body []byte) error {
	bodyBytes, err := GbkToUtf8(body)
	if err != nil {
		return err
	}
	decoder := xml.NewDecoder(bytes.NewReader(bodyBytes))
	decoder.CharsetReader = charset.NewReaderLabel
	err = decoder.Decode(v)
	return err
}