package autorest

// 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.

import (
	"bytes"
	"fmt"
	"strings"
	"sync"
)

const (
	major = 8
	minor = 0
	patch = 0
	tag   = ""
)

var once sync.Once
var version string

// Version returns the semantic version (see http://semver.org).
func Version() string {
	once.Do(func() {
		semver := fmt.Sprintf("%d.%d.%d", major, minor, patch)
		verBuilder := bytes.NewBufferString(semver)
		if tag != "" && tag != "-" {
			updated := strings.TrimPrefix(tag, "-")
			_, err := verBuilder.WriteString("-" + updated)
			if err == nil {
				verBuilder = bytes.NewBufferString(semver)
			}
		}
		version = verBuilder.String()
	})
	return version
}
