package version

import (
	"bytes"
	"fmt"

	"github.com/hashicorp/go-version"
)

// The git commit that was compiled. This will be filled in by the compiler.
var GitCommit string

// The main version number that is being run at the moment.
const Version = "1.6.5"

// A pre-release marker for the version. If this is "" (empty string)
// then it means that it is a final release. Otherwise, this is a pre-release
// such as "dev" (in development), "beta", "rc1", etc.
const VersionPrerelease = "dev"

func FormattedVersion() string {
	var versionString bytes.Buffer
	fmt.Fprintf(&versionString, "%s", Version)
	if VersionPrerelease != "" {
		fmt.Fprintf(&versionString, "-%s", VersionPrerelease)

		if GitCommit != "" {
			fmt.Fprintf(&versionString, " (%s)", GitCommit)
		}
	}

	return versionString.String()
}

// SemVer is an instance of version.Version. This has the secondary
// benefit of verifying during tests and init time that our version is a
// proper semantic version, which should always be the case.
var SemVer *version.Version

func init() {
	SemVer = version.Must(version.NewVersion(Version))
}

// String returns the complete version string, including prerelease
func String() string {
	if VersionPrerelease != "" {
		return fmt.Sprintf("%s-%s", Version, VersionPrerelease)
	}
	return Version
}