// Copyright (c) 2018-2019, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.

package cli

import (
	"os"

	"github.com/spf13/cobra"
	"github.com/sylabs/singularity/docs"
	"github.com/sylabs/singularity/internal/app/singularity"
	"github.com/sylabs/singularity/internal/pkg/sylog"
	"github.com/sylabs/singularity/pkg/cmdline"
)

func init() {
	cmdManager.RegisterFlagForCmd(&instanceListUserFlag, instanceListCmd)
	cmdManager.RegisterFlagForCmd(&instanceListJSONFlag, instanceListCmd)
}

// -u|--user
var instanceListUser string
var instanceListUserFlag = cmdline.Flag{
	ID:           "instanceListUserFlag",
	Value:        &instanceListUser,
	DefaultValue: "",
	Name:         "user",
	ShortHand:    "u",
	Usage:        `if running as root, list instances from "<username>"`,
	Tag:          "<username>",
	EnvKeys:      []string{"USER"},
}

// -j|--json
var instanceListJSON bool
var instanceListJSONFlag = cmdline.Flag{
	ID:           "instanceListJSONFlag",
	Value:        &instanceListJSON,
	DefaultValue: false,
	Name:         "json",
	ShortHand:    "j",
	Usage:        "print structured json instead of list",
	EnvKeys:      []string{"JSON"},
}

// singularity instance list
var instanceListCmd = &cobra.Command{
	Args: cobra.RangeArgs(0, 1),
	Run: func(cmd *cobra.Command, args []string) {
		name := "*"
		if len(args) > 0 {
			name = args[0]
		}

		uid := os.Getuid()
		if instanceListUser != "" && uid != 0 {
			sylog.Fatalf("Only root user can list user's instances")
		}

		err := singularity.PrintInstanceList(os.Stdout, name, instanceListUser, instanceListJSON)
		if err != nil {
			sylog.Fatalf("Could not list instances: %v", err)
		}
	},
	DisableFlagsInUseLine: true,

	Use:     docs.InstanceListUse,
	Short:   docs.InstanceListShort,
	Long:    docs.InstanceListLong,
	Example: docs.InstanceListExample,
}
