/*
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"
	"fmt"

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

type HostConfigManager struct {
	Common
}

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

// reference returns the ManagedObjectReference for the given HostConfigManager property name.
// An error is returned if the field is nil, of type ErrNotSupported if versioned is true.
func (m HostConfigManager) reference(ctx context.Context, name string, versioned ...bool) (types.ManagedObjectReference, error) {
	prop := "configManager." + name
	var content []types.ObjectContent

	err := m.Properties(ctx, m.Reference(), []string{prop}, &content)
	if err != nil {
		return types.ManagedObjectReference{}, err
	}

	for _, c := range content {
		for _, p := range c.PropSet {
			if p.Name != prop {
				continue
			}
			if ref, ok := p.Val.(types.ManagedObjectReference); ok {
				return ref, nil
			}
		}
	}

	err = fmt.Errorf("%s %s is nil", m.Reference(), prop)
	if len(versioned) == 1 && versioned[0] {
		err = ErrNotSupported
	}
	return types.ManagedObjectReference{}, err
}

func (m HostConfigManager) DatastoreSystem(ctx context.Context) (*HostDatastoreSystem, error) {
	ref, err := m.reference(ctx, "datastoreSystem")
	if err != nil {
		return nil, err
	}
	return NewHostDatastoreSystem(m.c, ref), nil
}

func (m HostConfigManager) NetworkSystem(ctx context.Context) (*HostNetworkSystem, error) {
	ref, err := m.reference(ctx, "networkSystem")
	if err != nil {
		return nil, err
	}
	return NewHostNetworkSystem(m.c, ref), nil
}

func (m HostConfigManager) FirewallSystem(ctx context.Context) (*HostFirewallSystem, error) {
	ref, err := m.reference(ctx, "firewallSystem")
	if err != nil {
		return nil, err
	}

	return NewHostFirewallSystem(m.c, ref), nil
}

func (m HostConfigManager) StorageSystem(ctx context.Context) (*HostStorageSystem, error) {
	ref, err := m.reference(ctx, "storageSystem")
	if err != nil {
		return nil, err
	}
	return NewHostStorageSystem(m.c, ref), nil
}

func (m HostConfigManager) VirtualNicManager(ctx context.Context) (*HostVirtualNicManager, error) {
	ref, err := m.reference(ctx, "virtualNicManager")
	if err != nil {
		return nil, err
	}
	return NewHostVirtualNicManager(m.c, ref, m.Reference()), nil
}

func (m HostConfigManager) VsanSystem(ctx context.Context) (*HostVsanSystem, error) {
	ref, err := m.reference(ctx, "vsanSystem", true) // Added in 5.5
	if err != nil {
		return nil, err
	}
	return NewHostVsanSystem(m.c, ref), nil
}

func (m HostConfigManager) VsanInternalSystem(ctx context.Context) (*HostVsanInternalSystem, error) {
	ref, err := m.reference(ctx, "vsanInternalSystem", true) // Added in 5.5
	if err != nil {
		return nil, err
	}
	return NewHostVsanInternalSystem(m.c, ref), nil
}

func (m HostConfigManager) AccountManager(ctx context.Context) (*HostAccountManager, error) {
	ref, err := m.reference(ctx, "accountManager", true) // Added in 5.5
	if err != nil {
		if err == ErrNotSupported {
			// Versions < 5.5 can use the ServiceContent ref,
			// but only when connected directly to ESX.
			if m.c.ServiceContent.AccountManager == nil {
				return nil, err
			}
			ref = *m.c.ServiceContent.AccountManager
		} else {
			return nil, err
		}
	}

	return NewHostAccountManager(m.c, ref), nil
}

func (m HostConfigManager) OptionManager(ctx context.Context) (*OptionManager, error) {
	ref, err := m.reference(ctx, "advancedOption")
	if err != nil {
		return nil, err
	}
	return NewOptionManager(m.c, ref), nil
}

func (m HostConfigManager) ServiceSystem(ctx context.Context) (*HostServiceSystem, error) {
	ref, err := m.reference(ctx, "serviceSystem")
	if err != nil {
		return nil, err
	}
	return NewHostServiceSystem(m.c, ref), nil
}

func (m HostConfigManager) CertificateManager(ctx context.Context) (*HostCertificateManager, error) {
	ref, err := m.reference(ctx, "certificateManager", true) // Added in 6.0
	if err != nil {
		return nil, err
	}
	return NewHostCertificateManager(m.c, ref, m.Reference()), nil
}

func (m HostConfigManager) DateTimeSystem(ctx context.Context) (*HostDateTimeSystem, error) {
	ref, err := m.reference(ctx, "dateTimeSystem")
	if err != nil {
		return nil, err
	}
	return NewHostDateTimeSystem(m.c, ref), nil
}