/*
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 importx

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"path"

	"github.com/vmware/govmomi/find"
	"github.com/vmware/govmomi/govc/cli"
	"github.com/vmware/govmomi/govc/flags"
	"github.com/vmware/govmomi/nfc"
	"github.com/vmware/govmomi/object"
	"github.com/vmware/govmomi/ovf"
	"github.com/vmware/govmomi/vim25"
	"github.com/vmware/govmomi/vim25/soap"
	"github.com/vmware/govmomi/vim25/types"
)

type ovfx struct {
	*flags.DatastoreFlag
	*flags.HostSystemFlag
	*flags.OutputFlag
	*flags.ResourcePoolFlag
	*flags.FolderFlag

	*ArchiveFlag
	*OptionsFlag

	Name string

	Client       *vim25.Client
	Datacenter   *object.Datacenter
	Datastore    *object.Datastore
	ResourcePool *object.ResourcePool
}

func init() {
	cli.Register("import.ovf", &ovfx{})
}

func (cmd *ovfx) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.DatastoreFlag, ctx = flags.NewDatastoreFlag(ctx)
	cmd.DatastoreFlag.Register(ctx, f)
	cmd.HostSystemFlag, ctx = flags.NewHostSystemFlag(ctx)
	cmd.HostSystemFlag.Register(ctx, f)
	cmd.OutputFlag, ctx = flags.NewOutputFlag(ctx)
	cmd.OutputFlag.Register(ctx, f)
	cmd.ResourcePoolFlag, ctx = flags.NewResourcePoolFlag(ctx)
	cmd.ResourcePoolFlag.Register(ctx, f)
	cmd.FolderFlag, ctx = flags.NewFolderFlag(ctx)
	cmd.FolderFlag.Register(ctx, f)

	cmd.ArchiveFlag, ctx = newArchiveFlag(ctx)
	cmd.ArchiveFlag.Register(ctx, f)
	cmd.OptionsFlag, ctx = newOptionsFlag(ctx)
	cmd.OptionsFlag.Register(ctx, f)

	f.StringVar(&cmd.Name, "name", "", "Name to use for new entity")
}

func (cmd *ovfx) Process(ctx context.Context) error {
	if err := cmd.DatastoreFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.HostSystemFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.OutputFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.ResourcePoolFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.ArchiveFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.OptionsFlag.Process(ctx); err != nil {
		return err
	}
	if err := cmd.FolderFlag.Process(ctx); err != nil {
		return err
	}
	return nil
}

func (cmd *ovfx) Usage() string {
	return "PATH_TO_OVF"
}

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

	archive := &FileArchive{Path: fpath}
	archive.Client = cmd.Client

	cmd.Archive = archive

	moref, err := cmd.Import(fpath)
	if err != nil {
		return err
	}

	vm := object.NewVirtualMachine(cmd.Client, *moref)
	return cmd.Deploy(vm, cmd.OutputFlag)
}

func (cmd *ovfx) Prepare(f *flag.FlagSet) (string, error) {
	var err error

	args := f.Args()
	if len(args) != 1 {
		return "", errors.New("no file specified")
	}

	cmd.Client, err = cmd.DatastoreFlag.Client()
	if err != nil {
		return "", err
	}

	cmd.Datacenter, err = cmd.DatastoreFlag.Datacenter()
	if err != nil {
		return "", err
	}

	cmd.Datastore, err = cmd.DatastoreFlag.Datastore()
	if err != nil {
		return "", err
	}

	cmd.ResourcePool, err = cmd.ResourcePoolFlag.ResourcePoolIfSpecified()
	if err != nil {
		return "", err
	}

	return f.Arg(0), nil
}

func (cmd *ovfx) Map(op []Property) (p []types.KeyValue) {
	for _, v := range op {
		p = append(p, v.KeyValue)
	}

	return
}

func (cmd *ovfx) validateNetwork(e *ovf.Envelope, net Network) {
	var names []string

	if e.Network != nil {
		for _, n := range e.Network.Networks {
			if n.Name == net.Name {
				return
			}
			names = append(names, n.Name)
		}
	}

	_, _ = cmd.Log(fmt.Sprintf("Warning: invalid NetworkMapping.Name=%q, valid names=%s\n", net.Name, names))
}

func (cmd *ovfx) NetworkMap(e *ovf.Envelope) ([]types.OvfNetworkMapping, error) {
	ctx := context.TODO()
	finder, err := cmd.DatastoreFlag.Finder()
	if err != nil {
		return nil, err
	}

	var nmap []types.OvfNetworkMapping
	for _, m := range cmd.Options.NetworkMapping {
		if m.Network == "" {
			continue // Not set, let vSphere choose the default network
		}
		cmd.validateNetwork(e, m)

		var ref types.ManagedObjectReference

		net, err := finder.Network(ctx, m.Network)
		if err != nil {
			switch err.(type) {
			case *find.NotFoundError:
				if !ref.FromString(m.Network) {
					return nil, err
				} // else this is a raw MO ref
			default:
				return nil, err
			}
		} else {
			ref = net.Reference()
		}

		nmap = append(nmap, types.OvfNetworkMapping{
			Name:    m.Name,
			Network: ref,
		})
	}

	return nmap, err
}

func (cmd *ovfx) Import(fpath string) (*types.ManagedObjectReference, error) {
	ctx := context.TODO()

	o, err := cmd.ReadOvf(fpath)
	if err != nil {
		return nil, err
	}

	e, err := cmd.ReadEnvelope(o)
	if err != nil {
		return nil, fmt.Errorf("failed to parse ovf: %s", err)
	}

	name := "Govc Virtual Appliance"
	if e.VirtualSystem != nil {
		name = e.VirtualSystem.ID
		if e.VirtualSystem.Name != nil {
			name = *e.VirtualSystem.Name
		}
	}

	// Override name from options if specified
	if cmd.Options.Name != nil {
		name = *cmd.Options.Name
	}

	// Override name from arguments if specified
	if cmd.Name != "" {
		name = cmd.Name
	}

	nmap, err := cmd.NetworkMap(e)
	if err != nil {
		return nil, err
	}

	cisp := types.OvfCreateImportSpecParams{
		DiskProvisioning:   cmd.Options.DiskProvisioning,
		EntityName:         name,
		IpAllocationPolicy: cmd.Options.IPAllocationPolicy,
		IpProtocol:         cmd.Options.IPProtocol,
		OvfManagerCommonParams: types.OvfManagerCommonParams{
			DeploymentOption: cmd.Options.Deployment,
			Locale:           "US"},
		PropertyMapping: cmd.Map(cmd.Options.PropertyMapping),
		NetworkMapping:  nmap,
	}

	host, err := cmd.HostSystemIfSpecified()
	if err != nil {
		return nil, err
	}

	if cmd.ResourcePool == nil {
		if host == nil {
			cmd.ResourcePool, err = cmd.ResourcePoolFlag.ResourcePool()
		} else {
			cmd.ResourcePool, err = host.ResourcePool(ctx)
		}
		if err != nil {
			return nil, err
		}
	}

	m := ovf.NewManager(cmd.Client)
	spec, err := m.CreateImportSpec(ctx, string(o), cmd.ResourcePool, cmd.Datastore, cisp)
	if err != nil {
		return nil, err
	}
	if spec.Error != nil {
		return nil, errors.New(spec.Error[0].LocalizedMessage)
	}
	if spec.Warning != nil {
		for _, w := range spec.Warning {
			_, _ = cmd.Log(fmt.Sprintf("Warning: %s\n", w.LocalizedMessage))
		}
	}

	if cmd.Options.Annotation != "" {
		switch s := spec.ImportSpec.(type) {
		case *types.VirtualMachineImportSpec:
			s.ConfigSpec.Annotation = cmd.Options.Annotation
		case *types.VirtualAppImportSpec:
			s.VAppConfigSpec.Annotation = cmd.Options.Annotation
		}
	}

	var folder *object.Folder
	// The folder argument must not be set on a VM in a vApp, otherwise causes
	// InvalidArgument fault: A specified parameter was not correct: pool
	if cmd.ResourcePool.Reference().Type != "VirtualApp" {
		folder, err = cmd.FolderOrDefault("vm")
		if err != nil {
			return nil, err
		}
	}

	lease, err := cmd.ResourcePool.ImportVApp(ctx, spec.ImportSpec, folder, host)
	if err != nil {
		return nil, err
	}

	info, err := lease.Wait(ctx, spec.FileItem)
	if err != nil {
		return nil, err
	}

	u := lease.StartUpdater(ctx, info)
	defer u.Done()

	for _, i := range info.Items {
		err = cmd.Upload(ctx, lease, i)
		if err != nil {
			return nil, err
		}
	}

	return &info.Entity, lease.Complete(ctx)
}

func (cmd *ovfx) Upload(ctx context.Context, lease *nfc.Lease, item nfc.FileItem) error {
	file := item.Path

	f, size, err := cmd.Open(file)
	if err != nil {
		return err
	}
	defer f.Close()

	logger := cmd.ProgressLogger(fmt.Sprintf("Uploading %s... ", path.Base(file)))
	defer logger.Wait()

	opts := soap.Upload{
		ContentLength: size,
		Progress:      logger,
	}

	return lease.Upload(ctx, item, f, opts)
}
