/*
 * Copyright 2020. Huawei Technologies Co., Ltd. All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *
 */
package huawei

import (
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/url"

	"bet24.com/servers/payment/config"
)

type AtResponse struct {
	AccessToken string `json:"access_token"`
}

type AtClient struct {
}

var AtDemo = &AtClient{}

func (atDemo *AtClient) GetAppAt() (string, error) {
	urlValue := url.Values{
		"grant_type":    {"client_credentials"},
		"client_secret": {config.Server.ClientSecret},
		"client_id":     {config.Server.ClientId}}

	//log.Debug("urlValue=%v", urlValue)
	//log.Debug("TokenUrl=%s", config.Server.TokenUrl)
	resp, err := RequestHttpClient.PostForm(config.Server.TokenUrl, urlValue)
	//log.Debug("GetAppAt=%v", resp)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	bodyBytes, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	var atResponse AtResponse
	json.Unmarshal(bodyBytes, &atResponse)
	if atResponse.AccessToken != "" {
		return atResponse.AccessToken, nil
	} else {
		return "", errors.New("Get token fail, " + string(bodyBytes))
	}
}

func BuildAuthorization() (string, error) {
	appAt, err := AtDemo.GetAppAt()
	if err != nil {
		return "", err
	}
	oriString := fmt.Sprintf("APPAT:%s", appAt)
	var authString = base64.StdEncoding.EncodeToString([]byte(oriString))
	var authHeaderString = fmt.Sprintf("Basic %s", authString)
	return authHeaderString, nil
}