/*
Copyright 2017 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"
	"reflect"
	"strings"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"

	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	kubetypes "k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/informers"
	csitrans "k8s.io/csi-translation-lib"
	"k8s.io/klog/v2/ktesting"
	fakeframework "k8s.io/kubernetes/pkg/scheduler/framework/fake"
	"k8s.io/kubernetes/pkg/volume/csimigration"
	"k8s.io/kubernetes/pkg/volume/fc"

	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/client-go/kubernetes/fake"
	utiltesting "k8s.io/client-go/util/testing"
	"k8s.io/kubernetes/pkg/volume"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"
)

const (
	testHostName      = "test-hostname"
	socketPath        = "/var/run/kmsplugin"
	migratedVolume    = "migrated-volume-name"
	nonMigratedVolume = "non-migrated-volume-name"
	testNodeName      = "test-node-name"
)

var (
	dirOrCreate = v1.HostPathType(v1.HostPathDirectoryOrCreate)
	nodeName    = kubetypes.NodeName(testNodeName)
	hostPath    = &v1.HostPathVolumeSource{
		Path: socketPath,
		Type: &dirOrCreate,
	}
	migratedObjectReference    = v1.ObjectReference{Namespace: "default", Name: "migrated-pvc"}
	nonMigratedObjectReference = v1.ObjectReference{Namespace: "default", Name: "non-migrated-pvc"}
	fsVolumeMode               = new(v1.PersistentVolumeMode)
)

type vaTest struct {
	desc                 string
	createNodeName       kubetypes.NodeName
	pod                  *v1.Pod
	wantVolume           *v1.Volume
	wantPersistentVolume *v1.PersistentVolume
	wantErrorMessage     string
}

func Test_CreateVolumeSpec(t *testing.T) {
	for _, test := range []vaTest{
		{
			desc:           "inline volume type that does not support csi migration",
			createNodeName: nodeName,
			pod: &v1.Pod{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "kube-apiserver",
					Namespace: "default",
				},
				Spec: v1.PodSpec{
					Volumes: []v1.Volume{
						{
							Name: migratedVolume,
							VolumeSource: v1.VolumeSource{
								HostPath: hostPath,
							},
						},
					},
				},
			},
			wantVolume: &v1.Volume{
				Name: migratedVolume,
				VolumeSource: v1.VolumeSource{
					HostPath: hostPath,
				},
			},
		},
		{
			desc:           "inline volume type that supports csi migration",
			createNodeName: nodeName,
			pod: &v1.Pod{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "kube-apiserver",
					Namespace: "default",
				},
				Spec: v1.PodSpec{
					Volumes: []v1.Volume{
						{
							Name: migratedVolume,
							VolumeSource: v1.VolumeSource{
								GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
									PDName:    "test-disk",
									FSType:    "ext4",
									Partition: 0,
									ReadOnly:  false,
								},
							},
						},
					},
				},
			},
			wantPersistentVolume: &v1.PersistentVolume{
				ObjectMeta: metav1.ObjectMeta{
					Name: "pd.csi.storage.gke.io-test-disk",
				},
				Spec: v1.PersistentVolumeSpec{
					PersistentVolumeSource: v1.PersistentVolumeSource{
						CSI: &v1.CSIPersistentVolumeSource{
							Driver:           "pd.csi.storage.gke.io",
							VolumeHandle:     "projects/UNSPECIFIED/zones/UNSPECIFIED/disks/test-disk",
							FSType:           "ext4",
							ReadOnly:         false,
							VolumeAttributes: map[string]string{"partition": ""},
						},
					},
					AccessModes: []v1.PersistentVolumeAccessMode{"ReadWriteOnce"},
					VolumeMode:  fsVolumeMode,
				},
			},
		},
		{
			desc:           "pv type that does not support csi migration",
			createNodeName: nodeName,
			pod: &v1.Pod{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "kube-apiserver",
					Namespace: "default",
				},
				Spec: v1.PodSpec{
					Volumes: []v1.Volume{
						{
							Name: nonMigratedVolume,
							VolumeSource: v1.VolumeSource{
								PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
									ClaimName: "non-migrated-pvc",
									ReadOnly:  false,
								},
							},
						},
					},
				},
			},
			wantPersistentVolume: &v1.PersistentVolume{
				ObjectMeta: metav1.ObjectMeta{
					Name: nonMigratedVolume,
				},
				Spec: v1.PersistentVolumeSpec{
					PersistentVolumeSource: v1.PersistentVolumeSource{
						ScaleIO: &v1.ScaleIOPersistentVolumeSource{},
					},
					ClaimRef: &nonMigratedObjectReference,
				},
			},
		},
		{
			desc:           "pv type that supports csi migration",
			createNodeName: nodeName,
			pod: &v1.Pod{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "kube-apiserver",
					Namespace: "default",
				},
				Spec: v1.PodSpec{
					Volumes: []v1.Volume{
						{
							Name: migratedVolume,
							VolumeSource: v1.VolumeSource{
								PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
									ClaimName: "migrated-pvc",
									ReadOnly:  false,
								},
							},
						},
					},
				},
			},
			wantPersistentVolume: &v1.PersistentVolume{
				ObjectMeta: metav1.ObjectMeta{
					Name: migratedVolume,
				},
				Spec: v1.PersistentVolumeSpec{
					PersistentVolumeSource: v1.PersistentVolumeSource{
						CSI: &v1.CSIPersistentVolumeSource{
							Driver:           "pd.csi.storage.gke.io",
							VolumeHandle:     "projects/UNSPECIFIED/zones/UNSPECIFIED/disks/test-disk",
							FSType:           "ext4",
							ReadOnly:         false,
							VolumeAttributes: map[string]string{"partition": ""},
						},
					},
					ClaimRef: &migratedObjectReference,
				},
			},
		},
		{
			desc:           "CSINode not found for a volume type that supports csi migration",
			createNodeName: kubetypes.NodeName("another-node"),
			pod: &v1.Pod{
				ObjectMeta: metav1.ObjectMeta{
					Name:      "kube-apiserver",
					Namespace: "default",
				},
				Spec: v1.PodSpec{
					Volumes: []v1.Volume{
						{
							Name: migratedVolume,
							VolumeSource: v1.VolumeSource{
								PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
									ClaimName: "migrated-pvc",
									ReadOnly:  false,
								},
							},
						},
					},
				},
			},
			wantErrorMessage: "csiNode \"another-node\" not found",
		},
	} {
		t.Run(test.desc, func(t *testing.T) {
			logger, _ := ktesting.NewTestContext(t)
			plugMgr, intreeToCSITranslator, csiTranslator, pvLister, pvcLister := setup(testNodeName, t)
			actualSpec, err := CreateVolumeSpec(logger, test.pod.Spec.Volumes[0], test.pod, test.createNodeName, plugMgr, pvcLister, pvLister, intreeToCSITranslator, csiTranslator)

			if actualSpec == nil && (test.wantPersistentVolume != nil || test.wantVolume != nil) {
				t.Errorf("got volume spec is nil")
			}

			if (len(test.wantErrorMessage) > 0 && err == nil) || (err != nil && !strings.Contains(err.Error(), test.wantErrorMessage)) {
				t.Errorf("got err %v, want err with message %v", err, test.wantErrorMessage)
			}

			if test.wantPersistentVolume != nil {
				if actualSpec.PersistentVolume == nil {
					t.Errorf("gotVolumeWithCSIMigration is nil")
				}

				gotVolumeWithCSIMigration := *actualSpec.PersistentVolume
				if gotVolumeWithCSIMigration.Name != test.wantPersistentVolume.Name {
					t.Errorf("got volume name is %v, want volume name is %v", gotVolumeWithCSIMigration.Name, test.wantPersistentVolume.Name)

				}
				if !reflect.DeepEqual(gotVolumeWithCSIMigration.Spec, test.wantPersistentVolume.Spec) {
					t.Errorf("got volume.Spec and want.Spec diff is %s", cmp.Diff(gotVolumeWithCSIMigration.Spec, test.wantPersistentVolume.Spec))
				}
			}
			if test.wantVolume != nil {
				if actualSpec.Volume == nil {
					t.Errorf("gotVolume is nil")
				}

				gotVolume := *actualSpec.Volume
				if !reflect.DeepEqual(gotVolume, *test.wantVolume) {
					t.Errorf("got volume and want diff is %s", cmp.Diff(gotVolume, test.wantVolume))
				}
			}
		})
	}
}

func setup(nodeName string, t *testing.T) (*volume.VolumePluginMgr, csimigration.PluginManager, csitrans.CSITranslator, fakeframework.PersistentVolumeLister, fakeframework.PersistentVolumeClaimLister) {
	tmpDir, err := utiltesting.MkTmpdir("csi-test")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	*fsVolumeMode = v1.PersistentVolumeFilesystem

	csiTranslator := csitrans.New()
	intreeToCSITranslator := csimigration.NewPluginManager(csiTranslator, utilfeature.DefaultFeatureGate)
	kubeClient := fake.NewSimpleClientset()

	factory := informers.NewSharedInformerFactory(kubeClient, time.Minute)
	csiDriverInformer := factory.Storage().V1().CSIDrivers()
	csiDriverLister := csiDriverInformer.Lister()
	volumeAttachmentInformer := factory.Storage().V1().VolumeAttachments()
	volumeAttachmentLister := volumeAttachmentInformer.Lister()

	plugMgr := &volume.VolumePluginMgr{}
	fakeAttachDetachVolumeHost := volumetest.NewFakeAttachDetachVolumeHostWithCSINodeName(t,
		tmpDir,
		kubeClient,
		fc.ProbeVolumePlugins(),
		nodeName,
		csiDriverLister,
		volumeAttachmentLister,
	)

	plugMgr.Host = fakeAttachDetachVolumeHost

	pvLister := fakeframework.PersistentVolumeLister{
		{
			ObjectMeta: metav1.ObjectMeta{Name: migratedVolume},
			Spec: v1.PersistentVolumeSpec{
				PersistentVolumeSource: v1.PersistentVolumeSource{
					GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
						PDName:    "test-disk",
						FSType:    "ext4",
						Partition: 0,
						ReadOnly:  false,
					},
				},
				ClaimRef: &migratedObjectReference,
			},
		},
		{
			ObjectMeta: metav1.ObjectMeta{Name: nonMigratedVolume},
			Spec: v1.PersistentVolumeSpec{
				PersistentVolumeSource: v1.PersistentVolumeSource{
					ScaleIO: &v1.ScaleIOPersistentVolumeSource{},
				},
				ClaimRef: &nonMigratedObjectReference,
			},
		},
	}

	pvcLister := fakeframework.PersistentVolumeClaimLister{
		{
			ObjectMeta: metav1.ObjectMeta{Name: "migrated-pvc", Namespace: "default"},
			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: migratedVolume},
			Status: v1.PersistentVolumeClaimStatus{
				Phase: v1.ClaimBound,
			},
		},
		{
			ObjectMeta: metav1.ObjectMeta{Name: "non-migrated-pvc", Namespace: "default"},
			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: nonMigratedVolume},
			Status: v1.PersistentVolumeClaimStatus{
				Phase: v1.ClaimBound,
			},
		},
	}

	return plugMgr, intreeToCSITranslator, csiTranslator, pvLister, pvcLister
}