/*
Copyright (c) 2014-2017 VMware, Inc. All Rights Reserved.

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 device

import (
	"context"
	"flag"
	"fmt"
	"os"
	"text/tabwriter"

	"github.com/vmware/govmomi/govc/cli"
	"github.com/vmware/govmomi/govc/flags"
)

type ls struct {
	*flags.VirtualMachineFlag

	boot bool
}

func init() {
	cli.Register("device.ls", &ls{})
}

func (cmd *ls) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.VirtualMachineFlag, ctx = flags.NewVirtualMachineFlag(ctx)
	cmd.VirtualMachineFlag.Register(ctx, f)

	f.BoolVar(&cmd.boot, "boot", false, "List devices configured in the VM's boot options")
}

func (cmd *ls) Process(ctx context.Context) error {
	if err := cmd.VirtualMachineFlag.Process(ctx); err != nil {
		return err
	}
	return nil
}

func (cmd *ls) Description() string {
	return `List devices for VM.

Examples:
  govc device.ls -vm $name`
}

func (cmd *ls) Run(ctx context.Context, f *flag.FlagSet) error {
	vm, err := cmd.VirtualMachine()
	if err != nil {
		return err
	}

	if vm == nil {
		return flag.ErrHelp
	}

	devices, err := vm.Device(ctx)
	if err != nil {
		return err
	}

	if cmd.boot {
		options, err := vm.BootOptions(ctx)
		if err != nil {
			return err
		}

		devices = devices.SelectBootOrder(options.BootOrder)
	}

	tw := tabwriter.NewWriter(os.Stdout, 3, 0, 2, ' ', 0)

	for _, device := range devices {
		fmt.Fprintf(tw, "%s\t%s\t%s\n", devices.Name(device), devices.TypeName(device),
			device.GetVirtualDevice().DeviceInfo.GetDescription().Summary)
	}

	return tw.Flush()
}