package e2e

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"regexp"
	"strings"
	"sync"
	"time"

	snapapi "github.com/kubernetes-csi/external-snapshotter/client/v4/apis/volumesnapshot/v1"
	batch "k8s.io/api/batch/v1"
	v1 "k8s.io/api/core/v1"
	scv1 "k8s.io/api/storage/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/util/wait"
	utilyaml "k8s.io/apimachinery/pkg/util/yaml"
	"k8s.io/client-go/kubernetes"
	"k8s.io/kubernetes/test/e2e/framework"
	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
)

/* #nosec:G101, values not credentials, just a reference to the location.*/
const (
	defaultNs     = "default"
	defaultSCName = ""

	rookToolBoxPodLabel = "app=rook-ceph-tools"
	rbdMountOptions     = "mountOptions"

	retainPolicy = v1.PersistentVolumeReclaimRetain
	// deletePolicy is the default policy in E2E.
	deletePolicy = v1.PersistentVolumeReclaimDelete
	// Default key and label for Listoptions.
	appKey   = "app"
	appLabel = "write-data-in-pod"

	noError = ""
)

var (
	// cli flags.
	deployTimeout    int
	deployCephFS     bool
	deployRBD        bool
	testCephFS       bool
	testRBD          bool
	helmTest         bool
	upgradeTesting   bool
	upgradeVersion   string
	cephCSINamespace string
	rookNamespace    string
	radosNamespace   string
	ns               string
	poll             = 2 * time.Second
)

func initResources() {
	ns = fmt.Sprintf("--namespace=%v", cephCSINamespace)
}

func getMons(ns string, c kubernetes.Interface) ([]string, error) {
	opt := metav1.ListOptions{
		LabelSelector: "app=rook-ceph-mon",
	}
	services := make([]string, 0)

	var svcList *v1.ServiceList
	t := time.Duration(deployTimeout) * time.Minute
	err := wait.PollImmediate(poll, t, func() (bool, error) {
		var svcErr error
		svcList, svcErr = c.CoreV1().Services(ns).List(context.TODO(), opt)
		if svcErr != nil {
			if isRetryableAPIError(svcErr) {
				return false, nil
			}

			return false, fmt.Errorf("failed to list Services in namespace %q: %w", ns, svcErr)
		}

		return true, nil
	})
	if err != nil {
		return services, fmt.Errorf("could not get Services: %w", err)
	}
	for i := range svcList.Items {
		s := fmt.Sprintf(
			"%s.%s.svc.cluster.local:%d",
			svcList.Items[i].Name,
			svcList.Items[i].Namespace,
			svcList.Items[i].Spec.Ports[0].Port)
		services = append(services, s)
	}

	return services, nil
}

func getStorageClass(path string) (scv1.StorageClass, error) {
	sc := scv1.StorageClass{}
	err := unmarshal(path, &sc)

	return sc, err
}

func getSecret(path string) (v1.Secret, error) {
	sc := v1.Secret{}
	err := unmarshal(path, &sc)
	// discard corruptInputError
	if err != nil {
		var b64cie base64.CorruptInputError
		if !errors.As(err, &b64cie) {
			return sc, err
		}
	}

	return sc, nil
}

func deleteResource(scPath string) error {
	data, err := replaceNamespaceInTemplate(scPath)
	if err != nil {
		e2elog.Logf("failed to read content from %s %v", scPath, err)
	}
	err = retryKubectlInput(cephCSINamespace, kubectlDelete, data, deployTimeout)
	if err != nil {
		e2elog.Logf("failed to delete %s %v", scPath, err)
	}

	return err
}

func unmarshal(fileName string, obj interface{}) error {
	f, err := ioutil.ReadFile(fileName)
	if err != nil {
		return err
	}
	data, err := utilyaml.ToJSON(f)
	if err != nil {
		return err
	}

	err = json.Unmarshal(data, obj)

	return err
}

// createPVCAndApp creates pvc and pod
// if name is not empty same will be set as pvc and app name.
func createPVCAndApp(
	name string,
	f *framework.Framework,
	pvc *v1.PersistentVolumeClaim,
	app *v1.Pod,
	pvcTimeout int) error {
	if name != "" {
		pvc.Name = name
		app.Name = name
		app.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = name
	}
	err := createPVCAndvalidatePV(f.ClientSet, pvc, pvcTimeout)
	if err != nil {
		return err
	}
	err = createApp(f.ClientSet, app, deployTimeout)

	return err
}

// deletePVCAndApp delete pvc and pod
// if name is not empty same will be set as pvc and app name.
func deletePVCAndApp(name string, f *framework.Framework, pvc *v1.PersistentVolumeClaim, app *v1.Pod) error {
	if name != "" {
		pvc.Name = name
		app.Name = name
		app.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = name
	}

	err := deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
	if err != nil {
		return err
	}
	err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)

	return err
}

func createPVCAndAppBinding(
	pvcPath, appPath string,
	f *framework.Framework,
	pvcTimeout int) (*v1.PersistentVolumeClaim, *v1.Pod, error) {
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return nil, nil, err
	}
	pvc.Namespace = f.UniqueName

	app, err := loadApp(appPath)
	if err != nil {
		return nil, nil, err
	}
	app.Namespace = f.UniqueName

	err = createPVCAndApp("", f, pvc, app, pvcTimeout)
	if err != nil {
		return nil, nil, err
	}

	return pvc, app, nil
}

func validatePVCAndAppBinding(pvcPath, appPath string, f *framework.Framework) error {
	pvc, app, err := createPVCAndAppBinding(pvcPath, appPath, f, deployTimeout)
	if err != nil {
		return err
	}
	err = deletePVCAndApp("", f, pvc, app)

	return err
}

func getMountType(appName, appNamespace, mountPath string, f *framework.Framework) (string, error) {
	opt := metav1.ListOptions{
		FieldSelector: fields.OneTermEqualSelector("metadata.name", appName).String(),
	}
	cmd := fmt.Sprintf("lsblk -o TYPE,MOUNTPOINT | grep '%s' | awk '{print $1}'", mountPath)
	stdOut, stdErr, err := execCommandInPod(f, cmd, appNamespace, &opt)
	if err != nil {
		return "", err
	}
	if stdErr != "" {
		return strings.TrimSpace(stdOut), fmt.Errorf(stdErr)
	}

	return strings.TrimSpace(stdOut), nil
}

func validateNormalUserPVCAccess(pvcPath string, f *framework.Framework) error {
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return err
	}
	pvc.Namespace = f.UniqueName
	pvc.Name = f.UniqueName
	err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		return err
	}
	var user int64 = 2000
	app := &v1.Pod{
		TypeMeta: metav1.TypeMeta{
			Kind:       "Pod",
			APIVersion: "v1",
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:      "pod-run-as-non-root",
			Namespace: f.UniqueName,
			Labels: map[string]string{
				"app": "pod-run-as-non-root",
			},
		},
		Spec: v1.PodSpec{
			Containers: []v1.Container{
				{
					Name:    "write-pod",
					Image:   "quay.io/centos/centos:latest",
					Command: []string{"/bin/sleep", "999999"},
					SecurityContext: &v1.SecurityContext{
						RunAsUser: &user,
					},
					VolumeMounts: []v1.VolumeMount{
						{
							MountPath: "/target",
							Name:      "target",
						},
					},
				},
			},
			Volumes: []v1.Volume{
				{
					Name: "target",
					VolumeSource: v1.VolumeSource{
						PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
							ClaimName: pvc.Name,
							ReadOnly:  false,
						},
					},
				},
			},
		},
	}

	err = createApp(f.ClientSet, app, deployTimeout)
	if err != nil {
		return err
	}

	opt := metav1.ListOptions{
		LabelSelector: "app=pod-run-as-non-root",
	}
	_, stdErr, err := execCommandInPod(f, "echo testing > /target/testing", app.Namespace, &opt)
	if err != nil {
		return fmt.Errorf("failed to exec command in pod: %w", err)
	}
	if stdErr != "" {
		return fmt.Errorf("failed to touch a file as non-root user %v", stdErr)
	}

	// metrics for BlockMode was added in Kubernetes 1.22
	isBlockMode := false
	if pvc.Spec.VolumeMode != nil {
		isBlockMode = (*pvc.Spec.VolumeMode == v1.PersistentVolumeBlock)
	}
	if !isBlockMode || k8sVersionGreaterEquals(f.ClientSet, 1, 22) {
		err = getMetricsForPVC(f, pvc, deployTimeout)
		if err != nil {
			return err
		}
	}

	err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
	if err != nil {
		return err
	}

	err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)

	return err
}

// writeDataInPod fill zero content to a file in the provided POD volume.
func writeDataInPod(app *v1.Pod, opt *metav1.ListOptions, f *framework.Framework) error {
	app.Namespace = f.UniqueName

	err := createApp(f.ClientSet, app, deployTimeout)
	if err != nil {
		return err
	}

	// write data to PVC. The idea here is to fill some content in the file
	// instead of filling and reverifying the md5sum/data integrity
	filePath := app.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
	// While writing more data we are encountering issues in E2E timeout, so keeping it low for now
	_, writeErr, err := execCommandInPod(
		f,
		fmt.Sprintf("dd if=/dev/zero of=%s bs=1M count=10 status=none", filePath),
		app.Namespace,
		opt)
	if err != nil {
		return err
	}
	if writeErr != "" {
		err = fmt.Errorf("failed to write data %v", writeErr)
	}

	return err
}

func checkDataPersist(pvcPath, appPath string, f *framework.Framework) error {
	data := "checking data persist"
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return err
	}

	pvc.Namespace = f.UniqueName

	app, err := loadApp(appPath)
	if err != nil {
		return err
	}
	app.Labels = map[string]string{"app": "validate-data"}
	app.Namespace = f.UniqueName

	err = createPVCAndApp("", f, pvc, app, deployTimeout)
	if err != nil {
		return err
	}

	opt := metav1.ListOptions{
		LabelSelector: "app=validate-data",
	}
	// write data to PVC
	filePath := app.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"

	_, stdErr, err := execCommandInPod(f, fmt.Sprintf("echo %s > %s", data, filePath), app.Namespace, &opt)
	if err != nil {
		return fmt.Errorf("failed to exec command in pod: %w", err)
	}
	if stdErr != "" {
		return fmt.Errorf("failed to write data to a file %v", stdErr)
	}
	// delete app
	err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
	if err != nil {
		return err
	}
	// recreate app and check data persist
	err = createApp(f.ClientSet, app, deployTimeout)
	if err != nil {
		return err
	}
	persistData, stdErr, err := execCommandInPod(f, fmt.Sprintf("cat %s", filePath), app.Namespace, &opt)
	if err != nil {
		return err
	}
	if stdErr != "" {
		return fmt.Errorf("failed to get file content %v", stdErr)
	}
	if !strings.Contains(persistData, data) {
		return fmt.Errorf("data not persistent expected data %s received data %s  ", data, persistData)
	}

	err = deletePVCAndApp("", f, pvc, app)

	return err
}

func pvcDeleteWhenPoolNotFound(pvcPath string, cephfs bool, f *framework.Framework) error {
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return err
	}
	pvc.Namespace = f.UniqueName

	err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		return err
	}
	if cephfs {
		err = deleteBackingCephFSVolume(f, pvc)
		if err != nil {
			return err
		}
		// delete cephfs filesystem
		err = deletePool("myfs", cephfs, f)
		if err != nil {
			return err
		}
	} else {
		err = deleteBackingRBDImage(f, pvc)
		if err != nil {
			return err
		}
		// delete rbd pool
		err = deletePool(defaultRBDPool, cephfs, f)
		if err != nil {
			return err
		}
	}
	err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)

	return err
}

func checkMountOptions(pvcPath, appPath string, f *framework.Framework, mountFlags []string) error {
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return err
	}

	pvc.Namespace = f.UniqueName

	app, err := loadApp(appPath)
	if err != nil {
		return err
	}
	app.Labels = map[string]string{"app": "validate-mount-opt"}
	app.Namespace = f.UniqueName

	err = createPVCAndApp("", f, pvc, app, deployTimeout)
	if err != nil {
		return err
	}

	opt := metav1.ListOptions{
		LabelSelector: "app=validate-mount-opt",
	}

	cmd := fmt.Sprintf("mount |grep %s", app.Spec.Containers[0].VolumeMounts[0].MountPath)
	data, stdErr, err := execCommandInPod(f, cmd, app.Namespace, &opt)
	if err != nil {
		return err
	}
	if stdErr != "" {
		return fmt.Errorf("failed to get mount point %v", stdErr)
	}
	for _, f := range mountFlags {
		if !strings.Contains(data, f) {
			return fmt.Errorf("mount option %s not found in %s", f, data)
		}
	}

	err = deletePVCAndApp("", f, pvc, app)

	return err
}

func addTopologyDomainsToDSYaml(template, labels string) string {
	return strings.ReplaceAll(template, "# - \"--domainlabels=failure-domain/region,failure-domain/zone\"",
		"- \"--domainlabels="+labels+"\"")
}

func oneReplicaDeployYaml(template string) string {
	re := regexp.MustCompile(`(\s+replicas:) \d+`)

	return re.ReplaceAllString(template, `$1 1`)
}

func enableTopologyInTemplate(data string) string {
	return strings.ReplaceAll(data, "--feature-gates=Topology=false", "--feature-gates=Topology=true")
}

func writeDataAndCalChecksum(app *v1.Pod, opt *metav1.ListOptions, f *framework.Framework) (string, error) {
	filePath := app.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
	// write data in PVC
	err := writeDataInPod(app, opt, f)
	if err != nil {
		e2elog.Logf("failed to write data in the pod with error %v", err)

		return "", err
	}

	checkSum, err := calculateSHA512sum(f, app, filePath, opt)
	if err != nil {
		e2elog.Logf("failed to calculate checksum with error %v", err)

		return checkSum, err
	}

	err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
	if err != nil {
		e2elog.Failf("failed to delete pod with error %v", err)
	}

	return checkSum, nil
}

// nolint:gocyclo,gocognit,nestif,cyclop // reduce complexity
func validatePVCClone(
	totalCount int,
	sourcePvcPath, sourceAppPath, clonePvcPath, clonePvcAppPath string,
	kms kmsConfig,
	validatePVC validateFunc,
	f *framework.Framework) {
	var wg sync.WaitGroup
	wgErrs := make([]error, totalCount)
	chErrs := make([]error, totalCount)
	pvc, err := loadPVC(sourcePvcPath)
	if err != nil {
		e2elog.Failf("failed to load PVC with error %v", err)
	}

	label := make(map[string]string)
	pvc.Namespace = f.UniqueName
	err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		e2elog.Failf("failed to create PVC with error %v", err)
	}
	app, err := loadApp(sourceAppPath)
	if err != nil {
		e2elog.Failf("failed to load app with error %v", err)
	}
	label[appKey] = appLabel
	app.Namespace = f.UniqueName
	app.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = pvc.Name
	app.Labels = label
	opt := metav1.ListOptions{
		LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
	}

	checkSum := ""
	pvc, err = f.ClientSet.CoreV1().
		PersistentVolumeClaims(pvc.Namespace).
		Get(context.TODO(), pvc.Name, metav1.GetOptions{})
	if err != nil {
		e2elog.Failf("failed to get pvc %v", err)
	}
	if *pvc.Spec.VolumeMode == v1.PersistentVolumeFilesystem {
		checkSum, err = writeDataAndCalChecksum(app, &opt, f)
		if err != nil {
			e2elog.Failf("failed to calculate checksum with error %v", err)
		}
	}
	// validate created backend rbd images
	validateRBDImageCount(f, 1, defaultRBDPool)
	pvcClone, err := loadPVC(clonePvcPath)
	if err != nil {
		e2elog.Failf("failed to load PVC with error %v", err)
	}
	pvcClone.Spec.DataSource.Name = pvc.Name
	pvcClone.Namespace = f.UniqueName
	appClone, err := loadApp(clonePvcAppPath)
	if err != nil {
		e2elog.Failf("failed to load application with error %v", err)
	}
	appClone.Namespace = f.UniqueName
	wg.Add(totalCount)
	// create clone and bind it to an app
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			label := make(map[string]string)
			label[appKey] = name
			a.Labels = label
			opt := metav1.ListOptions{
				LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
			}
			wgErrs[n] = createPVCAndApp(name, f, &p, &a, deployTimeout)
			if wgErrs[n] == nil && kms != noKMS {
				if kms.canGetPassphrase() {
					imageData, sErr := getImageInfoFromPVC(p.Namespace, name, f)
					if sErr != nil {
						wgErrs[n] = fmt.Errorf(
							"failed to get image info for %s namespace=%s volumehandle=%s error=%w",
							name,
							p.Namespace,
							imageData.csiVolumeHandle,
							sErr)
					} else {
						// check new passphrase created
						stdOut, stdErr := kms.getPassphrase(f, imageData.csiVolumeHandle)
						if stdOut != "" {
							e2elog.Logf("successfully read the passphrase from vault: %s", stdOut)
						}
						if stdErr != "" {
							wgErrs[n] = fmt.Errorf("failed to read passphrase from vault: %s", stdErr)
						}
					}
				}
			}
			if *pvc.Spec.VolumeMode == v1.PersistentVolumeFilesystem && wgErrs[n] == nil {
				filePath := a.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
				var checkSumClone string
				e2elog.Logf("Calculating checksum clone for filepath %s", filePath)
				checkSumClone, chErrs[n] = calculateSHA512sum(f, &a, filePath, &opt)
				e2elog.Logf("checksum for clone is %s", checkSumClone)
				if chErrs[n] != nil {
					e2elog.Logf("Failed calculating checksum clone %s", chErrs[n])
				}
				if checkSumClone != checkSum {
					e2elog.Logf("checksum didn't match. checksum=%s and checksumclone=%s", checkSum, checkSumClone)
				}
			}
			if wgErrs[n] == nil && validatePVC != nil && kms != noKMS {
				wgErrs[n] = validatePVC(f, &p, &a)
			}
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	failed := 0
	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to create PVC (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("creating PVCs failed, %d errors were logged", failed)
	}

	for i, err := range chErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to calculate checksum (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("calculating checksum failed, %d errors were logged", failed)
	}

	// total images in cluster is 1 parent rbd image+ total
	// temporary clone+ total clones
	totalCloneCount := totalCount + totalCount + 1
	validateRBDImageCount(f, totalCloneCount, defaultRBDPool)
	// delete parent pvc
	err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		e2elog.Failf("failed to delete PVC with error %v", err)
	}

	totalCloneCount = totalCount + totalCount
	validateRBDImageCount(f, totalCloneCount, defaultRBDPool)
	wg.Add(totalCount)
	// delete clone and app
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			p.Spec.DataSource.Name = name
			var imageData imageInfoFromPVC
			var sErr error
			if kms != noKMS {
				if kms.canGetPassphrase() {
					imageData, sErr = getImageInfoFromPVC(p.Namespace, name, f)
					if sErr != nil {
						wgErrs[n] = fmt.Errorf(
							"failed to get image info for %s namespace=%s volumehandle=%s error=%w",
							name,
							p.Namespace,
							imageData.csiVolumeHandle,
							sErr)
					}
				}
			}
			if wgErrs[n] == nil {
				wgErrs[n] = deletePVCAndApp(name, f, &p, &a)
				if wgErrs[n] == nil && kms != noKMS {
					if kms.canGetPassphrase() {
						// check passphrase deleted
						stdOut, _ := kms.getPassphrase(f, imageData.csiVolumeHandle)
						if stdOut != "" {
							wgErrs[n] = fmt.Errorf("passphrase found in vault while should be deleted: %s", stdOut)
						}
					}
					if wgErrs[n] == nil && kms.canVerifyKeyDestroyed() {
						destroyed, msg := kms.verifyKeyDestroyed(f, imageData.csiVolumeHandle)
						if !destroyed {
							wgErrs[n] = fmt.Errorf("passphrased was not destroyed: %s", msg)
						}
					}
				}
			}
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to delete PVC and application (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("deleting PVCs and applications failed, %d errors were logged", failed)
	}

	validateRBDImageCount(f, 0, defaultRBDPool)
}

// nolint:gocyclo,gocognit,nestif,cyclop // reduce complexity
func validatePVCSnapshot(
	totalCount int,
	pvcPath, appPath, snapshotPath, pvcClonePath, appClonePath string,
	kms kmsConfig,
	f *framework.Framework) {
	var wg sync.WaitGroup
	wgErrs := make([]error, totalCount)
	chErrs := make([]error, totalCount)
	err := createRBDSnapshotClass(f)
	if err != nil {
		e2elog.Failf("failed to create storageclass with error %v", err)
	}
	defer func() {
		err = deleteRBDSnapshotClass()
		if err != nil {
			e2elog.Failf("failed to delete VolumeSnapshotClass: %v", err)
		}
	}()

	pvc, err := loadPVC(pvcPath)
	if err != nil {
		e2elog.Failf("failed to load PVC with error %v", err)
	}
	label := make(map[string]string)
	pvc.Namespace = f.UniqueName
	err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		e2elog.Failf("failed to create PVC with error %v", err)
	}
	app, err := loadApp(appPath)
	if err != nil {
		e2elog.Failf("failed to load app with error %v", err)
	}
	// write data in PVC
	label[appKey] = appLabel
	app.Namespace = f.UniqueName
	app.Labels = label
	opt := metav1.ListOptions{
		LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
	}
	app.Spec.Volumes[0].PersistentVolumeClaim.ClaimName = pvc.Name
	checkSum, err := writeDataAndCalChecksum(app, &opt, f)
	if err != nil {
		e2elog.Failf("failed to calculate checksum with error %v", err)
	}
	validateRBDImageCount(f, 1, defaultRBDPool)
	snap := getSnapshot(snapshotPath)
	snap.Namespace = f.UniqueName
	snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name

	wg.Add(totalCount)
	// create snapshot
	for i := 0; i < totalCount; i++ {
		go func(n int, s snapapi.VolumeSnapshot) {
			s.Name = fmt.Sprintf("%s%d", f.UniqueName, n)
			wgErrs[n] = createSnapshot(&s, deployTimeout)
			if wgErrs[n] == nil && kms != noKMS {
				if kms.canGetPassphrase() {
					content, sErr := getVolumeSnapshotContent(s.Namespace, s.Name)
					if sErr != nil {
						wgErrs[n] = fmt.Errorf(
							"failed to get snapshotcontent for %s in namespace %s with error: %w",
							s.Name,
							s.Namespace,
							sErr)
					} else {
						// check new passphrase created
						_, stdErr := kms.getPassphrase(f, *content.Status.SnapshotHandle)
						if stdErr != "" {
							wgErrs[n] = fmt.Errorf("failed to read passphrase from vault: %s", stdErr)
						}
					}
				}
			}
			wg.Done()
		}(i, snap)
	}
	wg.Wait()

	failed := 0
	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to create snapshot (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("creating snapshots failed, %d errors were logged", failed)
	}

	// total images in cluster is 1 parent rbd image+ total snaps
	validateRBDImageCount(f, totalCount+1, defaultRBDPool)
	pvcClone, err := loadPVC(pvcClonePath)
	if err != nil {
		e2elog.Failf("failed to load PVC with error %v", err)
	}
	appClone, err := loadApp(appClonePath)
	if err != nil {
		e2elog.Failf("failed to load application with error %v", err)
	}
	pvcClone.Namespace = f.UniqueName
	appClone.Namespace = f.UniqueName
	pvcClone.Spec.DataSource.Name = fmt.Sprintf("%s%d", f.UniqueName, 0)

	// create multiple PVC from same snapshot
	wg.Add(totalCount)
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			label := make(map[string]string)
			label[appKey] = name
			a.Labels = label
			opt := metav1.ListOptions{
				LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
			}
			wgErrs[n] = createPVCAndApp(name, f, &p, &a, deployTimeout)
			if wgErrs[n] == nil {
				filePath := a.Spec.Containers[0].VolumeMounts[0].MountPath + "/test"
				var checkSumClone string
				e2elog.Logf("calculating checksum clone for filepath %s", filePath)
				checkSumClone, chErrs[n] = calculateSHA512sum(f, &a, filePath, &opt)
				e2elog.Logf("checksum value for the clone is %s with pod name %s", checkSumClone, name)
				if chErrs[n] != nil {
					e2elog.Logf("failed to calculte checksum for clone with error %s", chErrs[n])
				}
				if checkSumClone != checkSum {
					e2elog.Logf(
						"checksum value didn't match. checksum=%s and checksumclone=%s",
						checkSum,
						checkSumClone)
				}
			}
			if wgErrs[n] == nil && kms != noKMS {
				wgErrs[n] = isEncryptedPVC(f, &p, &a)
			}
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to create PVC and application (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("creating PVCs and applications failed, %d errors were logged", failed)
	}

	for i, err := range chErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to calculate checksum (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("calculating checksum failed, %d errors were logged", failed)
	}
	// total images in cluster is 1 parent rbd image+ total
	// snaps+ total clones
	totalCloneCount := totalCount + totalCount + 1
	validateRBDImageCount(f, totalCloneCount, defaultRBDPool)
	wg.Add(totalCount)
	// delete clone and app
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			p.Spec.DataSource.Name = name
			wgErrs[n] = deletePVCAndApp(name, f, &p, &a)
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to delete PVC and application (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("deleting PVCs and applications failed, %d errors were logged", failed)
	}

	// total images in cluster is 1 parent rbd image+ total
	// snaps
	validateRBDImageCount(f, totalCount+1, defaultRBDPool)
	// create clones from different snapshots and bind it to an
	// app
	wg.Add(totalCount)
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			p.Spec.DataSource.Name = name
			wgErrs[n] = createPVCAndApp(name, f, &p, &a, deployTimeout)
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to create PVC and application (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("creating PVCs and applications failed, %d errors were logged", failed)
	}

	// total images in cluster is 1 parent rbd image+ total
	// snaps+ total clones
	totalCloneCount = totalCount + totalCount + 1
	validateRBDImageCount(f, totalCloneCount, defaultRBDPool)
	// delete parent pvc
	err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		e2elog.Failf("failed to delete PVC with error %v", err)
	}

	// total images in cluster is total snaps+ total clones
	totalSnapCount := totalCount + totalCount
	validateRBDImageCount(f, totalSnapCount, defaultRBDPool)
	wg.Add(totalCount)
	// delete snapshot
	for i := 0; i < totalCount; i++ {
		go func(n int, s snapapi.VolumeSnapshot) {
			s.Name = fmt.Sprintf("%s%d", f.UniqueName, n)
			content := &snapapi.VolumeSnapshotContent{}
			var err error
			if kms != noKMS {
				if kms.canGetPassphrase() {
					content, err = getVolumeSnapshotContent(s.Namespace, s.Name)
					if err != nil {
						wgErrs[n] = fmt.Errorf(
							"failed to get snapshotcontent for %s in namespace %s with error: %w",
							s.Name,
							s.Namespace,
							err)
					}
				}
			}
			if wgErrs[n] == nil {
				wgErrs[n] = deleteSnapshot(&s, deployTimeout)
				if wgErrs[n] == nil && kms != noKMS {
					if kms.canGetPassphrase() {
						// check passphrase deleted
						stdOut, _ := kms.getPassphrase(f, *content.Status.SnapshotHandle)
						if stdOut != "" {
							wgErrs[n] = fmt.Errorf("passphrase found in vault while should be deleted: %s", stdOut)
						}
					}
					if wgErrs[n] == nil && kms.canVerifyKeyDestroyed() {
						destroyed, msg := kms.verifyKeyDestroyed(f, *content.Status.SnapshotHandle)
						if !destroyed {
							wgErrs[n] = fmt.Errorf("passphrased was not destroyed: %s", msg)
						}
					}
				}
			}
			wg.Done()
		}(i, snap)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to delete snapshot (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("deleting snapshots failed, %d errors were logged", failed)
	}

	validateRBDImageCount(f, totalCount, defaultRBDPool)
	wg.Add(totalCount)
	// delete clone and app
	for i := 0; i < totalCount; i++ {
		go func(n int, p v1.PersistentVolumeClaim, a v1.Pod) {
			name := fmt.Sprintf("%s%d", f.UniqueName, n)
			p.Spec.DataSource.Name = name
			wgErrs[n] = deletePVCAndApp(name, f, &p, &a)
			wg.Done()
		}(i, *pvcClone, *appClone)
	}
	wg.Wait()

	for i, err := range wgErrs {
		if err != nil {
			// not using Failf() as it aborts the test and does not log other errors
			e2elog.Logf("failed to delete PVC and application (%s%d): %v", f.UniqueName, i, err)
			failed++
		}
	}
	if failed != 0 {
		e2elog.Failf("deleting PVCs and applications failed, %d errors were logged", failed)
	}

	// validate created backend rbd images
	validateRBDImageCount(f, 0, defaultRBDPool)
}

// validateController simulates the required operations to validate the
// controller.
// Controller will generates the omap data when the PV is created.
// for that we need to do below operations
// Create PVC with Retain policy
// Store the PVC and PV kubernetes objects so that we can create static
// binding between PVC-PV
// Delete the omap data created for PVC
// Create the static PVC and PV and let controller regenerate the omap
// Mount the PVC to application (NodeStage/NodePublish should work)
// Resize the PVC
// Delete the Application and PVC.
func validateController(f *framework.Framework, pvcPath, appPath, scPath string) error {
	size := "1Gi"
	poolName := defaultRBDPool
	expandSize := "10Gi"
	var err error
	// create storageclass with retain
	err = createRBDStorageClass(f.ClientSet, f, defaultSCName, nil, nil, retainPolicy)
	if err != nil {
		return fmt.Errorf("failed to create storageclass: %w", err)
	}

	// create pvc
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return fmt.Errorf("failed to load PVC: %w", err)
	}
	resizePvc, err := loadPVC(pvcPath)
	if err != nil {
		return fmt.Errorf("failed to load PVC: %w", err)
	}
	resizePvc.Namespace = f.UniqueName

	pvc.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(size)
	pvc.Namespace = f.UniqueName
	err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to create PVC: %w", err)
	}
	// get pvc and pv object
	pvc, pv, err := getPVCAndPV(f.ClientSet, pvc.Name, pvc.Namespace)
	if err != nil {
		return fmt.Errorf("failed to get PVC: %w", err)
	}
	// Recreate storageclass with delete policy
	err = deleteResource(scPath)
	if err != nil {
		return fmt.Errorf("failed to delete storageclass: %w", err)
	}
	err = createRBDStorageClass(f.ClientSet, f, defaultSCName, nil, nil, deletePolicy)
	if err != nil {
		return fmt.Errorf("failed to create storageclass: %w", err)
	}
	// delete omap data
	err = deletePVCImageJournalInPool(f, pvc, poolName)
	if err != nil {
		return err
	}
	err = deletePVCCSIJournalInPool(f, pvc, poolName)
	if err != nil {
		return err
	}
	// delete pvc and pv
	err = deletePVCAndPV(f.ClientSet, pvc, pv, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to delete PVC or PV: %w", err)
	}
	// create pvc and pv with application
	pv.Spec.ClaimRef = nil
	pv.Spec.PersistentVolumeReclaimPolicy = deletePolicy
	// unset the resource version as should not be set on objects to be created
	pvc.ResourceVersion = ""
	pv.ResourceVersion = ""
	err = createPVCAndPV(f.ClientSet, pvc, pv)
	if err != nil {
		e2elog.Failf("failed to create PVC or PV: %v", err)
	}
	// bind PVC to application
	app, err := loadApp(appPath)
	if err != nil {
		return err
	}
	app.Labels = map[string]string{"app": "resize-pvc"}
	app.Namespace = f.UniqueName
	opt := metav1.ListOptions{
		LabelSelector: "app=resize-pvc",
	}
	err = createApp(f.ClientSet, app, deployTimeout)
	if err != nil {
		return err
	}
	// resize PVC
	err = expandPVCSize(f.ClientSet, resizePvc, expandSize, deployTimeout)
	if err != nil {
		return err
	}
	if *pvc.Spec.VolumeMode == v1.PersistentVolumeFilesystem {
		err = checkDirSize(app, f, &opt, expandSize)
		if err != nil {
			return err
		}
	}

	if *pvc.Spec.VolumeMode == v1.PersistentVolumeBlock {
		err = checkDeviceSize(app, f, &opt, expandSize)
		if err != nil {
			return err
		}
	}
	// delete pvc and storageclass
	err = deletePVCAndApp("", f, resizePvc, app)
	if err != nil {
		return err
	}

	return deleteResource(rbdExamplePath + "storageclass.yaml")
}

// k8sVersionGreaterEquals checks the ServerVersion of the Kubernetes cluster
// and compares it to the major.minor version passed. In case the version of
// the cluster is equal or higher to major.minor, `true` is returned, `false`
// otherwise.
//
// If fetching the ServerVersion of the Kubernetes cluster fails, the calling
// test case is marked as `FAILED` and gets aborted.
//
// nolint:unparam // currently major is always 1, this can change in the future
func k8sVersionGreaterEquals(c kubernetes.Interface, major, minor int) bool {
	v, err := c.Discovery().ServerVersion()
	if err != nil {
		e2elog.Failf("failed to get server version with error %v", err)
		// Failf() marks the case as failure, and returns from the
		// Go-routine that runs the case. This function will not have a
		// return value.
	}

	maj := fmt.Sprintf("%d", major)
	min := fmt.Sprintf("%d", minor)

	return (v.Major > maj) || (v.Major == maj && v.Minor >= min)
}

// waitForJobCompletion polls the status of the given job and waits until the
// jobs has succeeded or until the timeout is hit.
func waitForJobCompletion(c kubernetes.Interface, ns, job string, timeout int) error {
	t := time.Duration(timeout) * time.Minute
	start := time.Now()

	e2elog.Logf("waiting for Job %s/%s to be in state %q", ns, job, batch.JobComplete)

	return wait.PollImmediate(poll, t, func() (bool, error) {
		j, err := c.BatchV1().Jobs(ns).Get(context.TODO(), job, metav1.GetOptions{})
		if err != nil {
			if isRetryableAPIError(err) {
				return false, nil
			}

			return false, fmt.Errorf("failed to get Job: %w", err)
		}

		if j.Status.CompletionTime != nil {
			// Job has successfully completed
			return true, nil
		}

		e2elog.Logf(
			"Job %s/%s has not completed yet (%d seconds elapsed)",
			ns, job, int(time.Since(start).Seconds()))

		return false, nil
	})
}

// kubectlAction is used to tell retryKubectlInput() what action needs to be
// done.
type kubectlAction string

const (
	// kubectlCreate tells retryKubectlInput() to run "create".
	kubectlCreate = kubectlAction("create")
	// kubectlDelete tells retryKubectlInput() to run "delete".
	kubectlDelete = kubectlAction("delete")
)

// String returns the string format of the kubectlAction, this is automatically
// used when formatting strings with %s or %q.
func (ka kubectlAction) String() string {
	return string(ka)
}

// retryKubectlInput takes a namespace and action telling kubectl what to do,
// it then feeds data through stdin to the process. This function retries until
// no error occurred, or the timeout passed.
func retryKubectlInput(namespace string, action kubectlAction, data string, t int, args ...string) error {
	timeout := time.Duration(t) * time.Minute
	e2elog.Logf("waiting for kubectl (%s -f %q args %s) to finish", action, args)
	start := time.Now()

	return wait.PollImmediate(poll, timeout, func() (bool, error) {
		cmd := []string{}
		if len(args) != 0 {
			cmd = append(cmd, strings.Join(args, ""))
		}
		cmd = append(cmd, []string{string(action), "-f", "-"}...)

		_, err := framework.RunKubectlInput(namespace, data, cmd...)
		if err != nil {
			if isRetryableAPIError(err) {
				return false, nil
			}
			if isAlreadyExistsCLIError(err) {
				return true, nil
			}
			e2elog.Logf(
				"will run kubectl (%s) args (%s) again (%d seconds elapsed)",
				action,
				args,
				int(time.Since(start).Seconds()))

			return false, fmt.Errorf("failed to run kubectl: %w", err)
		}

		return true, nil
	})
}

// retryKubectlFile takes a namespace and action telling kubectl what to do
// with the passed filename and arguments. This function retries until no error
// occurred, or the timeout passed.
func retryKubectlFile(namespace string, action kubectlAction, filename string, t int, args ...string) error {
	timeout := time.Duration(t) * time.Minute
	e2elog.Logf("waiting for kubectl (%s -f %q args %s) to finish", action, filename, args)
	start := time.Now()

	return wait.PollImmediate(poll, timeout, func() (bool, error) {
		cmd := []string{}
		if len(args) != 0 {
			cmd = append(cmd, strings.Join(args, ""))
		}
		cmd = append(cmd, []string{string(action), "-f", filename}...)

		_, err := framework.RunKubectl(namespace, cmd...)
		if err != nil {
			if isRetryableAPIError(err) {
				return false, nil
			}
			if isAlreadyExistsCLIError(err) {
				return true, nil
			}
			e2elog.Logf(
				"will run kubectl (%s -f %q args %s) again (%d seconds elapsed)",
				action,
				filename,
				args,
				int(time.Since(start).Seconds()))

			return false, fmt.Errorf("failed to run kubectl: %w", err)
		}

		return true, nil
	})
}

// retryKubectlArgs takes a namespace and action telling kubectl what to do
// with the passed arguments. This function retries until no error occurred, or
// the timeout passed.
func retryKubectlArgs(namespace string, action kubectlAction, t int, args ...string) error {
	timeout := time.Duration(t) * time.Minute
	args = append([]string{string(action)}, args...)
	e2elog.Logf("waiting for kubectl (%s args) to finish", args)
	start := time.Now()

	return wait.PollImmediate(poll, timeout, func() (bool, error) {
		_, err := framework.RunKubectl(namespace, args...)
		if err != nil {
			if isRetryableAPIError(err) {
				return false, nil
			}
			if isAlreadyExistsCLIError(err) {
				return true, nil
			}
			e2elog.Logf(
				"will run kubectl (%s) again (%d seconds elapsed)",
				args,
				int(time.Since(start).Seconds()))

			return false, fmt.Errorf("failed to run kubectl: %w", err)
		}

		return true, nil
	})
}