/*
Copyright (c) 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 object

import (
	"context"

	"github.com/vmware/govmomi/vim25"
	"github.com/vmware/govmomi/vim25/methods"
	"github.com/vmware/govmomi/vim25/mo"
	"github.com/vmware/govmomi/vim25/types"
)

type Folder struct {
	Common
}

func NewFolder(c *vim25.Client, ref types.ManagedObjectReference) *Folder {
	return &Folder{
		Common: NewCommon(c, ref),
	}
}

func NewRootFolder(c *vim25.Client) *Folder {
	f := NewFolder(c, c.ServiceContent.RootFolder)
	f.InventoryPath = "/"
	return f
}

func (f Folder) Children(ctx context.Context) ([]Reference, error) {
	var mf mo.Folder

	err := f.Properties(ctx, f.Reference(), []string{"childEntity"}, &mf)
	if err != nil {
		return nil, err
	}

	var rs []Reference
	for _, e := range mf.ChildEntity {
		if r := NewReference(f.c, e); r != nil {
			rs = append(rs, r)
		}
	}

	return rs, nil
}

func (f Folder) CreateDatacenter(ctx context.Context, datacenter string) (*Datacenter, error) {
	req := types.CreateDatacenter{
		This: f.Reference(),
		Name: datacenter,
	}

	res, err := methods.CreateDatacenter(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	// Response will be nil if this is an ESX host that does not belong to a vCenter
	if res == nil {
		return nil, nil
	}

	return NewDatacenter(f.c, res.Returnval), nil
}

func (f Folder) CreateCluster(ctx context.Context, cluster string, spec types.ClusterConfigSpecEx) (*ClusterComputeResource, error) {
	req := types.CreateClusterEx{
		This: f.Reference(),
		Name: cluster,
		Spec: spec,
	}

	res, err := methods.CreateClusterEx(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	// Response will be nil if this is an ESX host that does not belong to a vCenter
	if res == nil {
		return nil, nil
	}

	return NewClusterComputeResource(f.c, res.Returnval), nil
}

func (f Folder) CreateFolder(ctx context.Context, name string) (*Folder, error) {
	req := types.CreateFolder{
		This: f.Reference(),
		Name: name,
	}

	res, err := methods.CreateFolder(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewFolder(f.c, res.Returnval), err
}

func (f Folder) CreateStoragePod(ctx context.Context, name string) (*StoragePod, error) {
	req := types.CreateStoragePod{
		This: f.Reference(),
		Name: name,
	}

	res, err := methods.CreateStoragePod(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewStoragePod(f.c, res.Returnval), err
}

func (f Folder) AddStandaloneHost(ctx context.Context, spec types.HostConnectSpec, addConnected bool, license *string, compResSpec *types.BaseComputeResourceConfigSpec) (*Task, error) {
	req := types.AddStandaloneHost_Task{
		This:         f.Reference(),
		Spec:         spec,
		AddConnected: addConnected,
	}

	if license != nil {
		req.License = *license
	}

	if compResSpec != nil {
		req.CompResSpec = *compResSpec
	}

	res, err := methods.AddStandaloneHost_Task(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewTask(f.c, res.Returnval), nil
}

func (f Folder) CreateVM(ctx context.Context, config types.VirtualMachineConfigSpec, pool *ResourcePool, host *HostSystem) (*Task, error) {
	req := types.CreateVM_Task{
		This:   f.Reference(),
		Config: config,
		Pool:   pool.Reference(),
	}

	if host != nil {
		ref := host.Reference()
		req.Host = &ref
	}

	res, err := methods.CreateVM_Task(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewTask(f.c, res.Returnval), nil
}

func (f Folder) RegisterVM(ctx context.Context, path string, name string, asTemplate bool, pool *ResourcePool, host *HostSystem) (*Task, error) {
	req := types.RegisterVM_Task{
		This:       f.Reference(),
		Path:       path,
		AsTemplate: asTemplate,
	}

	if name != "" {
		req.Name = name
	}

	if host != nil {
		ref := host.Reference()
		req.Host = &ref
	}

	if pool != nil {
		ref := pool.Reference()
		req.Pool = &ref
	}

	res, err := methods.RegisterVM_Task(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewTask(f.c, res.Returnval), nil
}

func (f Folder) CreateDVS(ctx context.Context, spec types.DVSCreateSpec) (*Task, error) {
	req := types.CreateDVS_Task{
		This: f.Reference(),
		Spec: spec,
	}

	res, err := methods.CreateDVS_Task(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewTask(f.c, res.Returnval), nil
}

func (f Folder) MoveInto(ctx context.Context, list []types.ManagedObjectReference) (*Task, error) {
	req := types.MoveIntoFolder_Task{
		This: f.Reference(),
		List: list,
	}

	res, err := methods.MoveIntoFolder_Task(ctx, f.c, &req)
	if err != nil {
		return nil, err
	}

	return NewTask(f.c, res.Returnval), nil
}