package adal

import (

	"fmt"

	"runtime"

)

// Copyright 2017 Microsoft Corporation

//

//  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.

const number = "v1.0.0"

var (

	ua = fmt.Sprintf("Go/%s (%s-%s) go-autorest/adal/%s",

		runtime.Version(),

		runtime.GOARCH,

		runtime.GOOS,

		number,

	)

)

// UserAgent returns a string containing the Go version, system architecture and OS, and the adal version.

func UserAgent() string {

	return ua

}

// AddToUserAgent adds an extension to the current user agent

func AddToUserAgent(extension string) error {

	if extension != "" {

		ua = fmt.Sprintf("%s %s", ua, extension)

		return nil

	}

	return fmt.Errorf("Extension was empty, User Agent remained as '%s'", ua)

}