/*
Copyright (c) 2014-2015 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"

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

type destroy struct {
	*flags.ClientFlag
	*flags.SearchFlag
}

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

func (cmd *destroy) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.ClientFlag, ctx = flags.NewClientFlag(ctx)
	cmd.ClientFlag.Register(ctx, f)

	cmd.SearchFlag, ctx = flags.NewSearchFlag(ctx, flags.SearchVirtualMachines)
	cmd.SearchFlag.Register(ctx, f)
}

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

func (cmd *destroy) Usage() string {
	return "VM..."
}

func (cmd *destroy) Description() string {
	return `Power off and delete VM.

When a VM is destroyed, any attached virtual disks are also deleted.
Use the 'device.remove -vm VM -keep disk-*' command to detach and
keep disks if needed, prior to calling vm.destroy.

Examples:
  govc vm.destroy my-vm`
}

func (cmd *destroy) Run(ctx context.Context, f *flag.FlagSet) error {
	vms, err := cmd.VirtualMachines(f.Args())
	if err != nil {
		return err
	}

	for _, vm := range vms {
		var (
			task  *object.Task
			state types.VirtualMachinePowerState
		)

		state, err = vm.PowerState(ctx)
		if err != nil {
			return err
		}

		if state == types.VirtualMachinePowerStatePoweredOn {
			task, err = vm.PowerOff(ctx)
			if err != nil {
				return err
			}

			// Ignore error since the VM may already been in powered off state.
			// vm.Destroy will fail if the VM is still powered on.
			_ = task.Wait(ctx)
		}

		task, err = vm.Destroy(ctx)
		if err != nil {
			return err
		}

		return task.Wait(ctx)
	}

	return nil
}