/*
Copyright (c) 2014-2022 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 vm

import (
	"context"
	"flag"
	"fmt"

	"github.com/vmware/govmomi/govc/cli"
	"github.com/vmware/govmomi/govc/flags"
	"github.com/vmware/govmomi/task"
	"github.com/vmware/govmomi/vim25/types"
)

type upgrade struct {
	*flags.VirtualMachineFlag
	version int
}

func init() {
	cli.Register("vm.upgrade", &upgrade{})
}

func isAlreadyUpgraded(err error) bool {
	if fault, ok := err.(task.Error); ok {
		_, ok = fault.Fault().(*types.AlreadyUpgraded)
		return ok
	}

	return false
}

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

	f.IntVar(&cmd.version, "version", 0, "Target vm hardware version, by default -- latest available")
}

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

func (cmd *upgrade) Description() string {
	return `Upgrade VMs to latest hardware version

Examples:
  govc vm.upgrade -vm $vm_name
  govc vm.upgrade -version=$version -vm $vm_name
  govc vm.upgrade -version=$version -vm.uuid $vm_uuid`
}

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

	var version = ""
	if cmd.version != 0 {
		version = fmt.Sprintf("vmx-%02d", cmd.version)
	}

	task, err := vm.UpgradeVM(ctx, version)
	if err != nil {
		return err
	}
	err = task.Wait(ctx)
	if err != nil {
		if isAlreadyUpgraded(err) {
			fmt.Println(err.Error())
		} else {
			return err
		}
	}

	return nil
}