/*
Copyright 2018 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 nodeinfomanager

import (
	"context"
	"encoding/json"
	"fmt"
	"math"
	"os"
	"reflect"
	"testing"

	"k8s.io/apimachinery/pkg/runtime"

	"github.com/stretchr/testify/assert"
	v1 "k8s.io/api/core/v1"
	storage "k8s.io/api/storage/v1"
	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/apimachinery/pkg/util/strategicpatch"
	"k8s.io/client-go/kubernetes/fake"
	clienttesting "k8s.io/client-go/testing"
	utiltesting "k8s.io/client-go/util/testing"
	"k8s.io/kubernetes/pkg/apis/core/helper"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"
	"k8s.io/kubernetes/pkg/volume/util"
	"k8s.io/utils/ptr"
)

type testcase struct {
	name             string
	driverName       string
	existingNode     *v1.Node
	existingCSINode  *storage.CSINode
	inputNodeID      string
	inputTopology    map[string]string
	inputVolumeLimit int64
	expectedNode     *v1.Node
	expectedCSINode  *storage.CSINode
	expectFail       bool
	hasModified      bool
}

type nodeIDMap map[string]string
type topologyKeyMap map[string][]string
type labelMap map[string]string

// TestInstallCSIDriver tests InstallCSIDriver with various existing Node and/or CSINode objects.
// The node IDs in all test cases below are the same between the Node annotation and CSINode.
func TestInstallCSIDriver(t *testing.T) {
	testcases := []testcase{
		{
			name:         "empty node",
			driverName:   "com.example.csi.driver1",
			existingNode: generateNode(nil /* nodeIDs */, nil /* labels */, nil /*capacity*/),
			inputNodeID:  "com.example.csi/csi-node1",
			inputTopology: map[string]string{
				"com.example.csi/zone": "zoneA",
			},
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
					Labels:      labelMap{"com.example.csi/zone": "zoneA"},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: []string{"com.example.csi/zone"},
						},
					},
				},
			},
		},
		{
			name:       "pre-existing node info from the same driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				labelMap{
					"com.example.csi/zone": "zoneA",
				},
				nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"com.example.csi.driver1": {"com.example.csi/zone"},
				},
			),
			inputNodeID: "com.example.csi/csi-node1",
			inputTopology: map[string]string{
				"com.example.csi/zone": "zoneA",
			},
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
					Labels:      labelMap{"com.example.csi/zone": "zoneA"},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: []string{"com.example.csi/zone"},
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:       "pre-existing node info from the same driver, but without topology info",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil /* labels */, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				nil, /* topologyKeys */
			),
			inputNodeID: "com.example.csi/csi-node1",
			inputTopology: map[string]string{
				"com.example.csi/zone": "zoneA",
			},
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
					Labels:      labelMap{"com.example.csi/zone": "zoneA"},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: []string{"com.example.csi/zone"},
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:       "pre-existing node info from different driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/test-node",
				},
				labelMap{
					"net.example.storage/rack": "rack1",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/test-node",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"net.example.storage.other-driver": {"net.example.storage/rack"},
				},
			),
			inputNodeID: "com.example.csi/csi-node1",
			inputTopology: map[string]string{
				"com.example.csi/zone": "zoneA",
			},
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{
						"com.example.csi.driver1":          "com.example.csi/csi-node1",
						"net.example.storage.other-driver": "net.example.storage/test-node",
					})},
					Labels: labelMap{
						"com.example.csi/zone":     "zoneA",
						"net.example.storage/rack": "rack1",
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "net.example.storage.other-driver",
							NodeID:       "net.example.storage/test-node",
							TopologyKeys: []string{"net.example.storage/rack"},
							Allocatable:  nil,
						},
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: []string{"com.example.csi/zone"},
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:       "pre-existing node info from the same driver, but different node ID and topology values; labels should conflict",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				labelMap{
					"com.example.csi/zone": "zoneA",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"com.example.csi.driver1": {"com.example.csi/zone"},
				},
			),
			inputNodeID: "com.example.csi/csi-node1",
			inputTopology: map[string]string{
				"com.example.csi/zone": "other-zone",
			},
			expectFail: true,
		},
		{
			name:       "pre-existing node info from the same driver, but different node ID and topology keys; new labels should be added",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				labelMap{
					"com.example.csi/zone": "zoneA",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"com.example.csi.driver1": {"com.example.csi/zone"},
				},
			),
			inputNodeID: "com.example.csi/other-node",
			inputTopology: map[string]string{
				"com.example.csi/rack": "rack1",
			},
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/other-node"})},
					Labels: labelMap{
						"com.example.csi/zone": "zoneA",
						"com.example.csi/rack": "rack1",
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/other-node",
							TopologyKeys: []string{"com.example.csi/rack"},
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:          "nil topology, empty node",
			driverName:    "com.example.csi.driver1",
			existingNode:  generateNode(nil /* nodeIDs */, nil /* labels */, nil /*capacity*/),
			inputNodeID:   "com.example.csi/csi-node1",
			inputTopology: nil,
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:       "nil topology, pre-existing node info from the same driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				labelMap{
					"com.example.csi/zone": "zoneA",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"com.example.csi.driver1": {"com.example.csi/zone"},
				},
			),
			inputNodeID:   "com.example.csi/csi-node1",
			inputTopology: nil,
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
					Labels: labelMap{
						"com.example.csi/zone": "zoneA",
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:       "nil topology, pre-existing node info from different driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/test-node",
				},
				labelMap{
					"net.example.storage/rack": "rack1",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/test-node",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"net.example.storage.other-driver": {"net.example.storage/rack"},
				},
			),
			inputNodeID:   "com.example.csi/csi-node1",
			inputTopology: nil,
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{
						"com.example.csi.driver1":          "com.example.csi/csi-node1",
						"net.example.storage.other-driver": "net.example.storage/test-node",
					})},
					Labels: labelMap{
						"net.example.storage/rack": "rack1",
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "net.example.storage.other-driver",
							NodeID:       "net.example.storage/test-node",
							TopologyKeys: []string{"net.example.storage/rack"},
							Allocatable:  nil,
						},
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable:  nil,
						},
					},
				},
			},
		},
		{
			name:         "empty node ID",
			driverName:   "com.example.csi.driver1",
			existingNode: generateNode(nil /* nodeIDs */, nil /* labels */, nil /*capacity*/),
			inputNodeID:  "",
			expectFail:   true,
		},
		{
			name:             "new node with valid max limit of volumes",
			driverName:       "com.example.csi.driver1",
			existingNode:     generateNode(nil /*nodeIDs*/, nil /*labels*/, nil /*capacity*/),
			inputVolumeLimit: 10,
			inputTopology:    nil,
			inputNodeID:      "com.example.csi/csi-node1",
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable: &storage.VolumeNodeResources{
								Count: ptr.To[int32](10),
							},
						},
					},
				},
			},
		},
		{
			name:             "new node with max limit of volumes",
			driverName:       "com.example.csi.driver1",
			existingNode:     generateNode(nil /*nodeIDs*/, nil /*labels*/, nil /*capacity*/),
			inputVolumeLimit: math.MaxInt32,
			inputTopology:    nil,
			inputNodeID:      "com.example.csi/csi-node1",
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable: &storage.VolumeNodeResources{
								Count: ptr.To[int32](math.MaxInt32),
							},
						},
					},
				},
			},
		},
		{
			name:             "new node with overflown max limit of volumes",
			driverName:       "com.example.csi.driver1",
			existingNode:     generateNode(nil /*nodeIDs*/, nil /*labels*/, nil /*capacity*/),
			inputVolumeLimit: math.MaxInt32 + 1,
			inputTopology:    nil,
			inputNodeID:      "com.example.csi/csi-node1",
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable: &storage.VolumeNodeResources{
								Count: ptr.To[int32](math.MaxInt32),
							},
						},
					},
				},
			},
		},
		{
			name:             "new node without max limit of volumes",
			driverName:       "com.example.csi.driver1",
			existingNode:     generateNode(nil /*nodeIDs*/, nil /*labels*/, nil /*capacity*/),
			inputVolumeLimit: 0,
			inputTopology:    nil,
			inputNodeID:      "com.example.csi/csi-node1",
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
						},
					},
				},
			},
		},
		{
			name:       "node with existing valid max limit of volumes",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nil, /*nodeIDs*/
				nil, /*labels*/
				map[v1.ResourceName]resource.Quantity{
					v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
				}),

			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				generateVolumeLimits(10),
				nil, /* topologyKeys */
			),

			inputVolumeLimit: 20,
			inputTopology:    nil,
			inputNodeID:      "com.example.csi/csi-node1",
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"com.example.csi.driver1": "com.example.csi/csi-node1"})},
				},
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "com.example.csi.driver1",
							NodeID:       "com.example.csi/csi-node1",
							TopologyKeys: nil,
							Allocatable:  generateVolumeLimits(20),
						},
					},
				},
			},
		},
	}

	test(t, true /* addNodeInfo */, testcases)
}

func generateVolumeLimits(i int32) *storage.VolumeNodeResources {
	return &storage.VolumeNodeResources{
		Count: ptr.To[int32](i),
	}
}

// TestUninstallCSIDriver tests UninstallCSIDriver with various existing Node and/or CSINode objects.
func TestUninstallCSIDriver(t *testing.T) {
	testcases := []testcase{
		{
			name:         "empty node and empty CSINode",
			driverName:   "com.example.csi.driver1",
			existingNode: generateNode(nil /* nodeIDs */, nil /* labels */, nil /*capacity*/),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec:       storage.CSINodeSpec{},
			},
		},
		{
			name:       "pre-existing node info from the same driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				labelMap{
					"com.example.csi/zone": "zoneA",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"com.example.csi.driver1": {"com.example.csi/zone"},
				},
			),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:   "node1",
					Labels: labelMap{"com.example.csi/zone": "zoneA"},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec:       storage.CSINodeSpec{},
			},
			hasModified: true,
		},
		{
			name:       "pre-existing node info from different driver",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/csi-node1",
				},
				labelMap{
					"net.example.storage/zone": "zoneA",
				}, nil /*capacity*/),
			existingCSINode: generateCSINode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/csi-node1",
				},
				nil, /* volumeLimits */
				topologyKeyMap{
					"net.example.storage.other-driver": {"net.example.storage/zone"},
				},
			),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"net.example.storage.other-driver": "net.example.storage/csi-node1"})},
					Labels:      labelMap{"net.example.storage/zone": "zoneA"},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec: storage.CSINodeSpec{
					Drivers: []storage.CSINodeDriver{
						{
							Name:         "net.example.storage.other-driver",
							NodeID:       "net.example.storage/csi-node1",
							TopologyKeys: []string{"net.example.storage/zone"},
						},
					},
				},
			},
			hasModified: false,
		},
		{
			name:       "pre-existing info about the same driver in node, but empty CSINode",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi.driver1": "com.example.csi/csi-node1",
				},
				nil /* labels */, nil /*capacity*/),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec:       storage.CSINodeSpec{},
			},
		},
		{
			name: "pre-existing info about a different driver in node, but empty CSINode",
			existingNode: generateNode(
				nodeIDMap{
					"net.example.storage.other-driver": "net.example.storage/csi-node1",
				},
				nil /* labels */, nil /*capacity*/),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{annotationKeyNodeID: marshall(nodeIDMap{"net.example.storage.other-driver": "net.example.storage/csi-node1"})},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec:       storage.CSINodeSpec{},
			},
		},
		{
			name:       "new node with valid max limit",
			driverName: "com.example.csi.driver1",
			existingNode: generateNode(
				nil, /*nodeIDs*/
				nil, /*labels*/
				map[v1.ResourceName]resource.Quantity{
					v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
					v1.ResourceName(util.GetCSIAttachLimitKey("com.example.csi/driver1")): *resource.NewQuantity(10, resource.DecimalSI),
				},
			),
			expectedNode: &v1.Node{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Capacity: v1.ResourceList{
						v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
						v1.ResourceName(util.GetCSIAttachLimitKey("com.example.csi/driver1")): *resource.NewQuantity(10, resource.DecimalSI),
					},
					Allocatable: v1.ResourceList{
						v1.ResourceCPU: *resource.NewScaledQuantity(4, -3),
						v1.ResourceName(util.GetCSIAttachLimitKey("com.example.csi/driver1")): *resource.NewQuantity(10, resource.DecimalSI),
					},
				},
			},
			expectedCSINode: &storage.CSINode{
				ObjectMeta: getCSINodeObjectMeta(),
				Spec:       storage.CSINodeSpec{},
			},
			inputTopology: nil,
			inputNodeID:   "com.example.csi/csi-node1",
		},
	}

	test(t, false /* addNodeInfo */, testcases)
}

func TestSetMigrationAnnotation(t *testing.T) {
	testcases := []struct {
		name            string
		migratedPlugins map[string](func() bool)
		existingNode    *storage.CSINode
		expectedNode    *storage.CSINode
		expectModified  bool
	}{
		{
			name: "nil migrated plugins",
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
			},
		},
		{
			name: "one modified plugin",
			migratedPlugins: map[string](func() bool){
				"test": func() bool { return true },
			},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test"},
				},
			},
			expectModified: true,
		},
		{
			name: "existing plugin",
			migratedPlugins: map[string](func() bool){
				"test": func() bool { return true },
			},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test"},
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test"},
				},
			},
			expectModified: false,
		},
		{
			name:            "remove plugin",
			migratedPlugins: map[string](func() bool){},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test"},
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{},
				},
			},
			expectModified: true,
		},
		{
			name: "one modified plugin, other annotations stable",
			migratedPlugins: map[string](func() bool){
				"test": func() bool { return true },
			},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{"other": "annotation"},
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test", "other": "annotation"},
				},
			},
			expectModified: true,
		},
		{
			name: "multiple plugins modified, other annotations stable",
			migratedPlugins: map[string](func() bool){
				"test": func() bool { return true },
				"foo":  func() bool { return false },
			},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{"other": "annotation", v1.MigratedPluginsAnnotationKey: "foo"},
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "test", "other": "annotation"},
				},
			},
			expectModified: true,
		},
		{
			name: "multiple plugins added, other annotations stable",
			migratedPlugins: map[string](func() bool){
				"test": func() bool { return true },
				"foo":  func() bool { return true },
			},
			existingNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{"other": "annotation"},
				},
			},
			expectedNode: &storage.CSINode{
				ObjectMeta: metav1.ObjectMeta{
					Name:        "node1",
					Annotations: map[string]string{v1.MigratedPluginsAnnotationKey: "foo,test", "other": "annotation"},
				},
			},
			expectModified: true,
		},
	}

	for _, tc := range testcases {
		t.Logf("test case: %s", tc.name)

		modified := setMigrationAnnotation(tc.migratedPlugins, tc.existingNode)
		if modified != tc.expectModified {
			t.Errorf("Expected modified to be %v but got %v instead", tc.expectModified, modified)
		}

		if !reflect.DeepEqual(tc.expectedNode, tc.existingNode) {
			t.Errorf("Expected CSINode: %v, but got: %v", tc.expectedNode, tc.existingNode)
		}
	}
}

func TestInstallCSIDriverExistingAnnotation(t *testing.T) {
	driverName := "com.example.csi/driver1"
	nodeID := "com.example.csi/some-node"

	testcases := []struct {
		name         string
		existingNode *v1.Node
	}{
		{
			name: "pre-existing info about the same driver in node, but empty CSINode",
			existingNode: generateNode(
				nodeIDMap{
					"com.example.csi/driver1": "com.example.csi/csi-node1",
				},
				nil /* labels */, nil /*capacity*/),
		},
		{
			name: "pre-existing info about a different driver in node, but empty CSINode",
			existingNode: generateNode(
				nodeIDMap{
					"net.example.storage/other-driver": "net.example.storage/test-node",
				},
				nil /* labels */, nil /*capacity*/),
		},
	}

	for _, tc := range testcases {
		t.Logf("test case: %q", tc.name)

		// Arrange
		nodeName := tc.existingNode.Name
		client := fake.NewSimpleClientset(tc.existingNode)

		tmpDir, err := utiltesting.MkTmpdir("nodeinfomanager-test")
		if err != nil {
			t.Fatalf("can't create temp dir: %v", err)
		}
		defer os.RemoveAll(tmpDir)
		host := volumetest.NewFakeVolumeHostWithCSINodeName(t,
			tmpDir,
			client,
			nil,
			nodeName,
			nil,
			nil,
		)

		nim := NewNodeInfoManager(types.NodeName(nodeName), host, nil)

		// Act
		_, err = nim.CreateCSINode()
		if err != nil {
			t.Errorf("expected no error from creating CSINodeinfo but got: %v", err)
			continue
		}
		err = nim.InstallCSIDriver(driverName, nodeID, 0 /* maxVolumeLimit */, nil) // TODO test maxVolumeLimit
		if err != nil {
			t.Errorf("expected no error from InstallCSIDriver call but got: %v", err)
			continue
		}

		// Assert
		nodeInfo, err := client.StorageV1().CSINodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
		if err != nil {
			t.Errorf("error getting CSINode: %v", err)
			continue
		}

		driver := nodeInfo.Spec.Drivers[0]
		if driver.Name != driverName || driver.NodeID != nodeID {
			t.Errorf("expected Driver to be %q and NodeID to be %q, but got: %q:%q", driverName, nodeID, driver.Name, driver.NodeID)
		}
	}
}

func getClientSet(existingNode *v1.Node, existingCSINode *storage.CSINode) *fake.Clientset {
	objects := []runtime.Object{}
	if existingNode != nil {
		objects = append(objects, existingNode)
	}
	if existingCSINode != nil {
		objects = append(objects, existingCSINode)
	}
	return fake.NewSimpleClientset(objects...)
}

func test(t *testing.T, addNodeInfo bool, testcases []testcase) {
	for _, tc := range testcases {
		t.Logf("test case: %q", tc.name)

		//// Arrange
		nodeName := tc.existingNode.Name
		client := getClientSet(tc.existingNode, tc.existingCSINode)

		tmpDir, err := utiltesting.MkTmpdir("nodeinfomanager-test")
		if err != nil {
			t.Fatalf("can't create temp dir: %v", err)
		}
		defer os.RemoveAll(tmpDir)
		host := volumetest.NewFakeVolumeHostWithCSINodeName(t,
			tmpDir,
			client,
			nil,
			nodeName,
			nil,
			nil,
		)
		nim := NewNodeInfoManager(types.NodeName(nodeName), host, nil)

		//// Act
		nim.CreateCSINode()
		if addNodeInfo {
			err = nim.InstallCSIDriver(tc.driverName, tc.inputNodeID, tc.inputVolumeLimit, tc.inputTopology)
		} else {
			err = nim.UninstallCSIDriver(tc.driverName)
		}

		//// Assert
		if tc.expectFail {
			if err == nil {
				t.Errorf("expected an error from InstallCSIDriver call but got none")
			}
			continue
		} else if err != nil {
			t.Errorf("expected no error from InstallCSIDriver call but got: %v", err)
			continue
		}

		actions := client.Actions()

		var node *v1.Node
		if action := hasPatchAction(actions); action != nil {
			node, err = applyNodeStatusPatch(tc.existingNode, action.(clienttesting.PatchActionImpl).GetPatch())
			assert.NoError(t, err)
		} else {
			node, err = client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
			assert.NoError(t, err)
		}

		if node == nil {
			t.Errorf("error getting node: %v", err)
			continue
		}

		if !helper.Semantic.DeepEqual(node, tc.expectedNode) {
			t.Errorf("expected Node %v; got: %v", tc.expectedNode, node)
		}

		// CSINode validation
		nodeInfo, err := client.StorageV1().CSINodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
		if err != nil {
			if !errors.IsNotFound(err) {
				t.Errorf("error getting CSINode: %v", err)
			}
			continue
		}
		if !helper.Semantic.DeepEqual(nodeInfo, tc.expectedCSINode) {
			t.Errorf("expected CSINode %v; got: %v", tc.expectedCSINode, nodeInfo)
		}

		if !addNodeInfo && tc.existingCSINode != nil && tc.existingNode != nil {
			if tc.hasModified && helper.Semantic.DeepEqual(nodeInfo, tc.existingCSINode) {
				t.Errorf("existing CSINode %v; got: %v", tc.existingCSINode, nodeInfo)
			}
			if !tc.hasModified && !helper.Semantic.DeepEqual(nodeInfo, tc.existingCSINode) {
				t.Errorf("existing CSINode %v; got: %v", tc.existingCSINode, nodeInfo)
			}
		}
	}
}

func generateNode(nodeIDs, labels map[string]string, capacity map[v1.ResourceName]resource.Quantity) *v1.Node {
	var annotations map[string]string
	if len(nodeIDs) > 0 {
		b, _ := json.Marshal(nodeIDs)
		annotations = map[string]string{annotationKeyNodeID: string(b)}
	}
	node := &v1.Node{
		ObjectMeta: metav1.ObjectMeta{
			Name:        "node1",
			Annotations: annotations,
			Labels:      labels,
		},
	}

	if len(capacity) > 0 {
		node.Status.Capacity = v1.ResourceList(capacity)
		node.Status.Allocatable = v1.ResourceList(capacity)
	}
	return node
}

func marshall(nodeIDs nodeIDMap) string {
	b, _ := json.Marshal(nodeIDs)
	return string(b)
}

func generateCSINode(nodeIDs nodeIDMap, volumeLimits *storage.VolumeNodeResources, topologyKeys topologyKeyMap) *storage.CSINode {
	nodeDrivers := []storage.CSINodeDriver{}
	for k, nodeID := range nodeIDs {
		dspec := storage.CSINodeDriver{
			Name:        k,
			NodeID:      nodeID,
			Allocatable: volumeLimits,
		}
		if top, exists := topologyKeys[k]; exists {
			dspec.TopologyKeys = top
		}
		nodeDrivers = append(nodeDrivers, dspec)
	}

	return &storage.CSINode{
		ObjectMeta: getCSINodeObjectMeta(),
		Spec: storage.CSINodeSpec{
			Drivers: nodeDrivers,
		},
	}
}

func getCSINodeObjectMeta() metav1.ObjectMeta {
	return metav1.ObjectMeta{
		Name: "node1",
		OwnerReferences: []metav1.OwnerReference{
			{
				APIVersion: nodeKind.Version,
				Kind:       nodeKind.Kind,
				Name:       "node1",
			},
		},
	}
}

func applyNodeStatusPatch(originalNode *v1.Node, patch []byte) (*v1.Node, error) {
	original, err := json.Marshal(originalNode)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal original node %#v: %v", originalNode, err)
	}
	updated, err := strategicpatch.StrategicMergePatch(original, patch, v1.Node{})
	if err != nil {
		return nil, fmt.Errorf("failed to apply strategic merge patch %q on node %#v: %v",
			patch, originalNode, err)
	}
	updatedNode := &v1.Node{}
	if err := json.Unmarshal(updated, updatedNode); err != nil {
		return nil, fmt.Errorf("failed to unmarshal updated node %q: %v", updated, err)
	}
	return updatedNode, nil
}

func hasPatchAction(actions []clienttesting.Action) clienttesting.Action {
	for _, action := range actions {
		if action.GetVerb() == "patch" {
			return action
		}
	}
	return nil
}
