/*
Copyright 2019 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 util

import (
	"os"
	"path"

	"k8s.io/klog"
)

// remove this once kubernetes v1.14.0 release is done
// https://github.com/kubernetes/cloud-provider/blob/master/volume/helpers/rounding.go
const (
	// MiB - MebiByte size
	MiB = 1024 * 1024
)

// RoundUpToMiB rounds up given quantity upto chunks of MiB
func RoundUpToMiB(size int64) int64 {
	requestBytes := size
	return roundUpSize(requestBytes, MiB)
}

func roundUpSize(volumeSizeBytes int64, allocationUnitBytes int64) int64 {
	roundedUp := volumeSizeBytes / allocationUnitBytes
	if volumeSizeBytes%allocationUnitBytes > 0 {
		roundedUp++
	}
	return roundedUp
}

// CreatePersistanceStorage creates storage path and initializes new cache
func CreatePersistanceStorage(sPath, metaDataStore, driverName string) (CachePersister, error) {
	var err error
	if err = createPersistentStorage(path.Join(sPath, "controller")); err != nil {
		klog.Errorf("failed to create persistent storage for controller: %v", err)
		return nil, err
	}

	if err = createPersistentStorage(path.Join(sPath, "node")); err != nil {
		klog.Errorf("failed to create persistent storage for node: %v", err)
		return nil, err
	}

	cp, err := NewCachePersister(metaDataStore, driverName)
	if err != nil {
		klog.Errorf("failed to define cache persistence method: %v", err)
		return nil, err
	}
	return cp, err
}

func createPersistentStorage(persistentStoragePath string) error {
	return os.MkdirAll(persistentStoragePath, os.FileMode(0755))
}