/*
Copyright (c) 2017-2018 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 disk

import (
	"context"
	"flag"
	"fmt"

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

type spec struct {
	types.FileBackedVirtualDiskSpec
	force bool
	uuid  string
}

func (s *spec) Register(ctx context.Context, f *flag.FlagSet) {
	f.StringVar(&s.AdapterType, "a", string(types.VirtualDiskAdapterTypeLsiLogic), "Disk adapter")
	f.StringVar(&s.DiskType, "d", string(types.VirtualDiskTypeThin), "Disk format")
	f.BoolVar(&s.force, "f", false, "Force")
	f.StringVar(&s.uuid, "uuid", "", "Disk UUID")
}

type create struct {
	*flags.DatastoreFlag

	Bytes units.ByteSize
	spec
}

func init() {
	cli.Register("datastore.disk.create", &create{})
}

func (cmd *create) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.DatastoreFlag, ctx = flags.NewDatastoreFlag(ctx)
	cmd.DatastoreFlag.Register(ctx, f)

	_ = cmd.Bytes.Set("10G")
	f.Var(&cmd.Bytes, "size", "Size of new disk")

	cmd.spec.Register(ctx, f)
}

func (cmd *create) Usage() string {
	return "VMDK"
}

func (cmd *create) Description() string {
	return `Create VMDK on DS.

Examples:
  govc datastore.mkdir disks
  govc datastore.disk.create -size 24G disks/disk1.vmdk
  govc datastore.disk.create disks/parent.vmdk disk/child.vmdk`
}

func (cmd *create) Run(ctx context.Context, f *flag.FlagSet) error {
	if f.NArg() == 0 {
		return flag.ErrHelp
	}

	dc, err := cmd.Datacenter()
	if err != nil {
		return err
	}

	ds, err := cmd.Datastore()
	if err != nil {
		return err
	}

	m := object.NewVirtualDiskManager(ds.Client())

	var task *object.Task
	var dst string

	if f.NArg() == 1 {
		cmd.spec.CapacityKb = int64(cmd.Bytes) / 1024
		dst = ds.Path(f.Arg(0))
		task, err = m.CreateVirtualDisk(ctx, dst, dc, &cmd.spec.FileBackedVirtualDiskSpec)
	} else {
		dst = ds.Path(f.Arg(0))
		task, err = m.CreateChildDisk(ctx, ds.Path(f.Arg(0)), dc, dst, dc, cmd.force)
	}

	if err != nil {
		return err
	}

	logger := cmd.ProgressLogger(fmt.Sprintf("Creating %s...", dst))
	defer logger.Wait()

	if _, err = task.WaitForResult(ctx, logger); err != nil {
		return err
	}

	if cmd.uuid != "" {
		return m.SetVirtualDiskUuid(ctx, dst, dc, cmd.uuid)
	}

	return nil
}