// © Broadcom. All Rights Reserved.
// The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.
// SPDX-License-Identifier: Apache-2.0

package dvs

import (
	"context"
	"flag"
	"fmt"
	"os"
	"strings"

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

type add struct {
	*flags.HostSystemFlag

	path string
	pnic string
}

func init() {
	cli.Register("dvs.add", &add{})
}

func (cmd *add) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
	cmd.HostSystemFlag.Register(ctx, f)

	f.StringVar(&cmd.path, "dvs", "", "DVS path")
	f.StringVar(&cmd.pnic, "pnic", "vmnic0", "Name of the host physical NIC")
}

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

func (cmd *add) Usage() string {
	return "HOST..."
}

func (cmd *add) Description() string {
	return `Add hosts to DVS.

Examples:
  govc dvs.add -dvs dvsName -pnic vmnic1 hostA hostB hostC`
}

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

	finder, err := cmd.Finder()
	if err != nil {
		return err
	}

	net, err := finder.Network(ctx, cmd.path)
	if err != nil {
		return err
	}

	dvs, ok := net.(*object.DistributedVirtualSwitch)
	if !ok {
		return fmt.Errorf("%s (%T) is not of type %T", cmd.path, net, dvs)
	}

	var s mo.DistributedVirtualSwitch
	err = dvs.Properties(ctx, dvs.Reference(), []string{"config"}, &s)
	if err != nil {
		return err
	}

	backing := new(types.DistributedVirtualSwitchHostMemberPnicBacking)

	for _, vmnic := range strings.Split(cmd.pnic, ",") {
		backing.PnicSpec = append(backing.PnicSpec, types.DistributedVirtualSwitchHostMemberPnicSpec{
			PnicDevice: strings.TrimSpace(vmnic),
		})
	}

	config := &types.DVSConfigSpec{
		ConfigVersion: s.Config.GetDVSConfigInfo().ConfigVersion,
	}

	hosts, err := cmd.HostSystems(f.Args())
	if err != nil {
		return err
	}

	existing := make(map[string]bool)
	// TODO: host.pnic.info command
	for _, member := range s.Config.GetDVSConfigInfo().Host {
		existing[member.Config.Host.Value] = true
	}

	for _, host := range hosts {
		ref := host.Reference()
		if existing[ref.Value] {
			fmt.Fprintf(os.Stderr, "%s is already a member of %s\n", host.InventoryPath, dvs.InventoryPath)
			continue
		}

		config.Host = append(config.Host, types.DistributedVirtualSwitchHostMemberConfigSpec{
			Operation: "add",
			Host:      ref,
			Backing:   backing,
		})
	}

	if len(config.Host) == 0 {
		return nil
	}

	task, err := dvs.Reconfigure(ctx, config)
	if err != nil {
		return err
	}

	logger := cmd.ProgressLogger(fmt.Sprintf("adding %d hosts to dvs %s... ", len(config.Host), dvs.InventoryPath))
	defer logger.Wait()

	_, err = task.WaitForResult(ctx, logger)
	return err
}
