// -*- Mode: Go; indent-tabs-mode: t -*-

/*
 * Copyright (C) 2016 Canonical Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package main

import (
	"fmt"

	"github.com/snapcore/snapd/client"
	"github.com/snapcore/snapd/cmd"
	"github.com/snapcore/snapd/i18n"

	"github.com/jessevdk/go-flags"
)

var shortVersionHelp = i18n.G("Shows version details")
var longVersionHelp = i18n.G(`
The version command displays the versions of the running client, server,
and operating system.
`)

type cmdVersion struct{}

func init() {
	addCommand("version", shortHelpHelp, longHelpHelp, func() flags.Commander { return &cmdVersion{} }, nil, nil)
}

func (cmd cmdVersion) Execute(args []string) error {
	if len(args) > 0 {
		return ErrExtraArgs
	}

	printVersions()
	return nil
}

func printVersions() error {
	sv, err := Client().ServerVersion()
	if err != nil {
		sv = &client.ServerVersion{
			Version:     i18n.G("unavailable"),
			Series:      "-",
			OSID:        "-",
			OSVersionID: "-",
		}
	}

	w := tabWriter()

	fmt.Fprintf(w, "snap\t%s\n", cmd.Version)
	fmt.Fprintf(w, "snapd\t%s\n", sv.Version)
	fmt.Fprintf(w, "series\t%s\n", sv.Series)
	if sv.OnClassic {
		fmt.Fprintf(w, "%s\t%s\n", sv.OSID, sv.OSVersionID)
	}
	w.Flush()

	return err
}
