/*
Copyright 2014 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 gcepd

import (
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"sort"
	"testing"

	"k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/client-go/kubernetes/fake"
	utiltesting "k8s.io/client-go/util/testing"
	volumehelpers "k8s.io/cloud-provider/volume/helpers"
	"k8s.io/kubernetes/pkg/util/mount"
	"k8s.io/kubernetes/pkg/volume"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"
)

func TestCanSupport(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/gce-pd")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	if plug.GetPluginName() != "kubernetes.io/gce-pd" {
		t.Errorf("Wrong name: %s", plug.GetPluginName())
	}
	if !plug.CanSupport(&volume.Spec{Volume: &v1.Volume{VolumeSource: v1.VolumeSource{GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{}}}}) {
		t.Errorf("Expected true")
	}
	if !plug.CanSupport(&volume.Spec{PersistentVolume: &v1.PersistentVolume{Spec: v1.PersistentVolumeSpec{PersistentVolumeSource: v1.PersistentVolumeSource{GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{}}}}}) {
		t.Errorf("Expected true")
	}
}

func TestGetAccessModes(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPersistentPluginByName("kubernetes.io/gce-pd")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	if !volumetest.ContainsAccessMode(plug.GetAccessModes(), v1.ReadWriteOnce) || !volumetest.ContainsAccessMode(plug.GetAccessModes(), v1.ReadOnlyMany) {
		t.Errorf("Expected two AccessModeTypes:  %s and %s", v1.ReadWriteOnce, v1.ReadOnlyMany)
	}
}

type fakePDManager struct {
}

func (fake *fakePDManager) CreateVolume(c *gcePersistentDiskProvisioner, node *v1.Node, allowedTopologies []v1.TopologySelectorTerm) (volumeID string, volumeSizeGB int, labels map[string]string, fstype string, err error) {
	labels = make(map[string]string)
	labels["fakepdmanager"] = "yes"
	labels[v1.LabelZoneFailureDomain] = "zone1__zone2"
	return "test-gce-volume-name", 100, labels, "", nil
}

func (fake *fakePDManager) DeleteVolume(cd *gcePersistentDiskDeleter) error {
	if cd.pdName != "test-gce-volume-name" {
		return fmt.Errorf("Deleter got unexpected volume name: %s", cd.pdName)
	}
	return nil
}

func getNodeSelectorRequirementWithKey(key string, term v1.NodeSelectorTerm) (*v1.NodeSelectorRequirement, error) {
	for _, r := range term.MatchExpressions {
		if r.Key == key {
			return &r, nil
		}
	}
	return nil, fmt.Errorf("key %s not found", key)
}

func TestPlugin(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/gce-pd")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	spec := &v1.Volume{
		Name: "vol1",
		VolumeSource: v1.VolumeSource{
			GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
				PDName: "pd",
				FSType: "ext4",
			},
		},
	}
	fakeManager := &fakePDManager{}
	fakeMounter := &mount.FakeMounter{}
	mounter, err := plug.(*gcePersistentDiskPlugin).newMounterInternal(volume.NewSpecFromVolume(spec), types.UID("poduid"), fakeManager, fakeMounter)
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	volPath := filepath.Join(tmpDir, "pods/poduid/volumes/kubernetes.io~gce-pd/vol1")
	path := mounter.GetPath()
	if path != volPath {
		t.Errorf("Got unexpected path: %s", path)
	}

	if err := mounter.SetUp(volume.MounterArgs{}); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	if _, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", path)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}

	fakeManager = &fakePDManager{}
	unmounter, err := plug.(*gcePersistentDiskPlugin).newUnmounterInternal("vol1", types.UID("poduid"), fakeManager, fakeMounter)
	if err != nil {
		t.Errorf("Failed to make a new Unmounter: %v", err)
	}
	if unmounter == nil {
		t.Errorf("Got a nil Unmounter")
	}

	if err := unmounter.TearDown(); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	if _, err := os.Stat(path); err == nil {
		t.Errorf("TearDown() failed, volume path still exists: %s", path)
	} else if !os.IsNotExist(err) {
		t.Errorf("TearDown() failed: %v", err)
	}

	// Test Provisioner
	options := volume.VolumeOptions{
		PVC:                           volumetest.CreateTestPVC("100Mi", []v1.PersistentVolumeAccessMode{v1.ReadWriteOnce}),
		PersistentVolumeReclaimPolicy: v1.PersistentVolumeReclaimDelete,
	}
	provisioner, err := plug.(*gcePersistentDiskPlugin).newProvisionerInternal(options, &fakePDManager{})
	if err != nil {
		t.Errorf("Error creating new provisioner:%v", err)
	}
	persistentSpec, err := provisioner.Provision(nil, nil)
	if err != nil {
		t.Errorf("Provision() failed: %v", err)
	}

	if persistentSpec.Spec.PersistentVolumeSource.GCEPersistentDisk.PDName != "test-gce-volume-name" {
		t.Errorf("Provision() returned unexpected volume ID: %s", persistentSpec.Spec.PersistentVolumeSource.GCEPersistentDisk.PDName)
	}
	cap := persistentSpec.Spec.Capacity[v1.ResourceStorage]
	size := cap.Value()
	if size != 100*volumehelpers.GiB {
		t.Errorf("Provision() returned unexpected volume size: %v", size)
	}

	if persistentSpec.Labels["fakepdmanager"] != "yes" {
		t.Errorf("Provision() returned unexpected value for fakepdmanager: %v", persistentSpec.Labels["fakepdmanager"])
	}

	if persistentSpec.Labels[v1.LabelZoneFailureDomain] != "zone1__zone2" {
		t.Errorf("Provision() returned unexpected value for %s: %v", v1.LabelZoneFailureDomain, persistentSpec.Labels[v1.LabelZoneFailureDomain])
	}

	if persistentSpec.Spec.NodeAffinity == nil {
		t.Errorf("Unexpected nil NodeAffinity found")
	}
	if len(persistentSpec.Spec.NodeAffinity.Required.NodeSelectorTerms) != 1 {
		t.Errorf("Unexpected number of NodeSelectorTerms")
	}
	term := persistentSpec.Spec.NodeAffinity.Required.NodeSelectorTerms[0]
	if len(term.MatchExpressions) != 2 {
		t.Errorf("Unexpected number of NodeSelectorRequirements in volume NodeAffinity: %d", len(term.MatchExpressions))
	}
	r, _ := getNodeSelectorRequirementWithKey("fakepdmanager", term)
	if r == nil || r.Values[0] != "yes" || r.Operator != v1.NodeSelectorOpIn {
		t.Errorf("NodeSelectorRequirement fakepdmanager-in-yes not found in volume NodeAffinity")
	}
	zones, _ := volumehelpers.ZonesToSet("zone1,zone2")
	r, _ = getNodeSelectorRequirementWithKey(v1.LabelZoneFailureDomain, term)
	if r == nil {
		t.Errorf("NodeSelectorRequirement %s-in-%v not found in volume NodeAffinity", v1.LabelZoneFailureDomain, zones)
	}
	sort.Strings(r.Values)
	if !reflect.DeepEqual(r.Values, zones.List()) {
		t.Errorf("ZoneFailureDomain elements %v does not match zone labels %v", r.Values, zones)
	}

	// Test Deleter
	volSpec := &volume.Spec{
		PersistentVolume: persistentSpec,
	}
	deleter, err := plug.(*gcePersistentDiskPlugin).newDeleterInternal(volSpec, &fakePDManager{})
	if err != nil {
		t.Errorf("Error creating new deleter:%v", err)
	}
	err = deleter.Delete()
	if err != nil {
		t.Errorf("Deleter() failed: %v", err)
	}
}

func TestMountOptions(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, volumetest.NewFakeVolumeHost(tmpDir, nil, nil))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/gce-pd")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pv := &v1.PersistentVolume{
		ObjectMeta: metav1.ObjectMeta{
			Name: "pvA",
		},
		Spec: v1.PersistentVolumeSpec{
			PersistentVolumeSource: v1.PersistentVolumeSource{
				GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{},
			},
			ClaimRef: &v1.ObjectReference{
				Name: "claimA",
			},
			MountOptions: []string{"_netdev"},
		},
	}

	fakeManager := &fakePDManager{}
	fakeMounter := &mount.FakeMounter{}

	mounter, err := plug.(*gcePersistentDiskPlugin).newMounterInternal(volume.NewSpecFromPersistentVolume(pv, false), types.UID("poduid"), fakeManager, fakeMounter)
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	if err := mounter.SetUp(volume.MounterArgs{}); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	mountOptions := fakeMounter.MountPoints[0].Opts
	expectedMountOptions := []string{"_netdev", "bind"}
	if !reflect.DeepEqual(mountOptions, expectedMountOptions) {
		t.Errorf("Expected mount options to be %v got %v", expectedMountOptions, mountOptions)
	}
}

func TestPersistentClaimReadOnlyFlag(t *testing.T) {
	pv := &v1.PersistentVolume{
		ObjectMeta: metav1.ObjectMeta{
			Name: "pvA",
		},
		Spec: v1.PersistentVolumeSpec{
			PersistentVolumeSource: v1.PersistentVolumeSource{
				GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{},
			},
			ClaimRef: &v1.ObjectReference{
				Name: "claimA",
			},
		},
	}

	claim := &v1.PersistentVolumeClaim{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "claimA",
			Namespace: "nsA",
		},
		Spec: v1.PersistentVolumeClaimSpec{
			VolumeName: "pvA",
		},
		Status: v1.PersistentVolumeClaimStatus{
			Phase: v1.ClaimBound,
		},
	}

	client := fake.NewSimpleClientset(pv, claim)

	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, volumetest.NewFakeVolumeHost(tmpDir, client, nil))
	plug, _ := plugMgr.FindPluginByName(gcePersistentDiskPluginName)

	// readOnly bool is supplied by persistent-claim volume source when its mounter creates other volumes
	spec := volume.NewSpecFromPersistentVolume(pv, true)
	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{UID: types.UID("poduid")}}
	mounter, _ := plug.NewMounter(spec, pod, volume.VolumeOptions{})
	if mounter == nil {
		t.Fatalf("Got a nil Mounter")
	}

	if !mounter.GetAttributes().ReadOnly {
		t.Errorf("Expected true for mounter.IsReadOnly")
	}
}
