/*
Copyright 2016 The Kubernetes Authors.

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 diskmanagers

import (
	"context"
	"fmt"

	"github.com/golang/glog"
	"k8s.io/kubernetes/pkg/cloudprovider/providers/vsphere/vclib"
)

// VirtualDisk is for the Disk Management
type VirtualDisk struct {
	DiskPath      string
	VolumeOptions *vclib.VolumeOptions
	VMOptions     *vclib.VMOptions
}

// VirtualDisk Operations Const
const (
	VirtualDiskCreateOperation = "Create"
	VirtualDiskDeleteOperation = "Delete"
)

// VirtualDiskProvider defines interfaces for creating disk
type VirtualDiskProvider interface {
	Create(ctx context.Context, datastore *vclib.Datastore) (string, error)
	Delete(ctx context.Context, datacenter *vclib.Datacenter) error
}

// getDiskManager returns vmDiskManager or vdmDiskManager based on given volumeoptions
func getDiskManager(disk *VirtualDisk, diskOperation string) VirtualDiskProvider {
	var diskProvider VirtualDiskProvider
	switch diskOperation {
	case VirtualDiskDeleteOperation:
		diskProvider = virtualDiskManager{disk.DiskPath, disk.VolumeOptions}
	case VirtualDiskCreateOperation:
		if disk.VolumeOptions.StoragePolicyName != "" || disk.VolumeOptions.VSANStorageProfileData != "" || disk.VolumeOptions.StoragePolicyID != "" {
			diskProvider = vmDiskManager{disk.DiskPath, disk.VolumeOptions, disk.VMOptions}
		} else {
			diskProvider = virtualDiskManager{disk.DiskPath, disk.VolumeOptions}
		}
	}
	return diskProvider
}

// Create gets appropriate disk manager and calls respective create method
func (virtualDisk *VirtualDisk) Create(ctx context.Context, datastore *vclib.Datastore) (string, error) {
	if virtualDisk.VolumeOptions.DiskFormat == "" {
		virtualDisk.VolumeOptions.DiskFormat = vclib.ThinDiskType
	}
	if !virtualDisk.VolumeOptions.VerifyVolumeOptions() {
		glog.Error("VolumeOptions verification failed. volumeOptions: ", virtualDisk.VolumeOptions)
		return "", vclib.ErrInvalidVolumeOptions
	}
	if virtualDisk.VolumeOptions.StoragePolicyID != "" && virtualDisk.VolumeOptions.StoragePolicyName != "" {
		return "", fmt.Errorf("Storage Policy ID and Storage Policy Name both set, Please set only one parameter")
	}
	return getDiskManager(virtualDisk, VirtualDiskCreateOperation).Create(ctx, datastore)
}

// Delete gets appropriate disk manager and calls respective delete method
func (virtualDisk *VirtualDisk) Delete(ctx context.Context, datacenter *vclib.Datacenter) error {
	return getDiskManager(virtualDisk, VirtualDiskDeleteOperation).Delete(ctx, datacenter)
}