// Copyright © 2017 NAME HERE <EMAIL ADDRESS>
//
// 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 cmd

import (
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"github.com/virtual-kubelet/virtual-kubelet/providers/register"
)

// versionCmd represents the version command
var providersCmd = &cobra.Command{
	Use:   "providers",
	Short: "Show the list of supported providers",
	Long:  "Show the list of supported providers",
	Args:  cobra.MaximumNArgs(2),
	Run: func(cmd *cobra.Command, args []string) {
		switch len(args) {
		case 0:
			ls := register.List()
			for _, p := range ls {
				fmt.Fprintln(cmd.OutOrStdout(), p)
			}
		case 1:
			if !register.Exists(args[0]) {
				fmt.Fprintln(cmd.OutOrStderr(), "no such provider", args[0])

				// TODO(@cpuuy83): would be nice to not short-circuit the exit here
				// But at the momemt this seems to be the only way to exit non-zero and
				// handle our own error output
				os.Exit(1)
			}
			fmt.Fprintln(cmd.OutOrStdout(), args[0])
		}
		return
	},
}

func init() {
	RootCmd.AddCommand(providersCmd)
}