// Copyright 2015 The etcd Authors
//
// 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 version implements etcd version parsing and contains latest version
// information.
package version

import (
	"fmt"
	"strings"

	"github.com/coreos/go-semver/semver"
)

var (
	// MinClusterVersion is the min cluster version this etcd binary is compatible with.
	MinClusterVersion = "3.0.0"
	Version           = "3.6.0-alpha.0"
	APIVersion        = "unknown"

	// Git SHA Value will be set during build
	GitSHA = "Not provided (use ./build instead of go build)"
)

// Get all constant versions defined in a centralized place.
var (
	V3_0 = semver.Version{Major: 3, Minor: 0}
	V3_1 = semver.Version{Major: 3, Minor: 1}
	V3_2 = semver.Version{Major: 3, Minor: 2}
	V3_3 = semver.Version{Major: 3, Minor: 3}
	V3_4 = semver.Version{Major: 3, Minor: 4}
	V3_5 = semver.Version{Major: 3, Minor: 5}
	V3_6 = semver.Version{Major: 3, Minor: 6}
	V3_7 = semver.Version{Major: 3, Minor: 7}
	V4_0 = semver.Version{Major: 4, Minor: 0}

	// AllVersions keeps all the versions in ascending order.
	AllVersions = []semver.Version{V3_0, V3_1, V3_2, V3_3, V3_4, V3_5, V3_6, V3_7, V4_0}
)

func init() {
	ver, err := semver.NewVersion(Version)
	if err == nil {
		APIVersion = fmt.Sprintf("%d.%d", ver.Major, ver.Minor)
	}
}

type Versions struct {
	Server  string `json:"etcdserver"`
	Cluster string `json:"etcdcluster"`
	Storage string `json:"storage"`
	// TODO: raft state machine version
}

// Cluster only keeps the major.minor.
func Cluster(v string) string {
	vs := strings.Split(v, ".")
	if len(vs) <= 2 {
		return v
	}
	return fmt.Sprintf("%s.%s", vs[0], vs[1])
}

func Compare(ver1, ver2 semver.Version) int {
	return ver1.Compare(ver2)
}

func LessThan(ver1, ver2 semver.Version) bool {
	return ver1.LessThan(ver2)
}

func Equal(ver1, ver2 semver.Version) bool {
	return ver1.Equal(ver2)
}