/*
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 persistentvolume

import (
	"reflect"
	"testing"

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

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/sets"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	api "k8s.io/kubernetes/pkg/apis/core"
	"k8s.io/kubernetes/pkg/features"
	"k8s.io/utils/ptr"
)

func TestDropDisabledFields(t *testing.T) {
	vacName := ptr.To("vac")

	tests := map[string]struct {
		oldSpec       *api.PersistentVolumeSpec
		newSpec       *api.PersistentVolumeSpec
		expectOldSpec *api.PersistentVolumeSpec
		expectNewSpec *api.PersistentVolumeSpec
		vacEnabled    bool
	}{
		"disabled vac clears volume attributes class name": {
			vacEnabled:    false,
			newSpec:       specWithVACName(vacName),
			expectNewSpec: specWithVACName(nil),
			oldSpec:       nil,
			expectOldSpec: nil,
		},
		"enabled vac preserve volume attributes class name": {
			vacEnabled:    true,
			newSpec:       specWithVACName(vacName),
			expectNewSpec: specWithVACName(vacName),
			oldSpec:       nil,
			expectOldSpec: nil,
		},
		"enabled vac preserve volume attributes class name when both old and new have it": {
			vacEnabled:    true,
			newSpec:       specWithVACName(vacName),
			expectNewSpec: specWithVACName(vacName),
			oldSpec:       specWithVACName(vacName),
			expectOldSpec: specWithVACName(vacName),
		},
		"disabled vac old pv had volume attributes class name": {
			vacEnabled:    false,
			newSpec:       specWithVACName(vacName),
			expectNewSpec: specWithVACName(vacName),
			oldSpec:       specWithVACName(vacName),
			expectOldSpec: specWithVACName(vacName),
		},
		"enabled vac preserves volume attributes class name when old pv did not had it": {
			vacEnabled:    true,
			newSpec:       specWithVACName(vacName),
			expectNewSpec: specWithVACName(vacName),
			oldSpec:       specWithVACName(nil),
			expectOldSpec: specWithVACName(nil),
		},
		"disabled vac neither new pv nor old pv had volume attributes class name": {
			vacEnabled:    false,
			newSpec:       specWithVACName(nil),
			expectNewSpec: specWithVACName(nil),
			oldSpec:       specWithVACName(nil),
			expectOldSpec: specWithVACName(nil),
		},
	}

	for name, tc := range tests {
		t.Run(name, func(t *testing.T) {
			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeAttributesClass, tc.vacEnabled)

			DropDisabledSpecFields(tc.newSpec, tc.oldSpec)
			if !reflect.DeepEqual(tc.newSpec, tc.expectNewSpec) {
				t.Error(cmp.Diff(tc.newSpec, tc.expectNewSpec))
			}
			if !reflect.DeepEqual(tc.oldSpec, tc.expectOldSpec) {
				t.Error(cmp.Diff(tc.oldSpec, tc.expectOldSpec))
			}
		})
	}
}

func specWithVACName(vacName *string) *api.PersistentVolumeSpec {
	pvSpec := &api.PersistentVolumeSpec{
		PersistentVolumeSource: api.PersistentVolumeSource{
			CSI: &api.CSIPersistentVolumeSource{
				Driver:       "com.google.gcepd",
				VolumeHandle: "foobar",
			},
		},
	}

	if vacName != nil {
		pvSpec.VolumeAttributesClassName = vacName
	}
	return pvSpec
}

func TestWarnings(t *testing.T) {
	testcases := []struct {
		name     string
		template *api.PersistentVolume
		expected []string
	}{
		{
			name:     "null",
			template: nil,
			expected: nil,
		},
		{
			name: "no warning",
			template: &api.PersistentVolume{
				ObjectMeta: metav1.ObjectMeta{
					Name: "foo",
				},
				Status: api.PersistentVolumeStatus{
					Phase: api.VolumeBound,
				},
			},
			expected: nil,
		},
		{
			name: "warning",
			template: &api.PersistentVolume{
				ObjectMeta: metav1.ObjectMeta{
					Name: "foo",
					Annotations: map[string]string{
						api.BetaStorageClassAnnotation: "",
					},
				},
				Spec: api.PersistentVolumeSpec{
					NodeAffinity: &api.VolumeNodeAffinity{
						Required: &api.NodeSelector{
							NodeSelectorTerms: []api.NodeSelectorTerm{
								{
									MatchExpressions: []api.NodeSelectorRequirement{
										{
											Key:      "beta.kubernetes.io/os",
											Operator: "Equal",
											Values:   []string{"windows"},
										},
									},
								},
							},
						},
					},
				},
				Status: api.PersistentVolumeStatus{
					Phase: api.VolumeBound,
				},
			},
			expected: []string{
				`metadata.annotations[volume.beta.kubernetes.io/storage-class]: deprecated since v1.8; use "storageClassName" attribute instead`,
				`spec.nodeAffinity.required.nodeSelectorTerms[0].matchExpressions[0].key: beta.kubernetes.io/os is deprecated since v1.14; use "kubernetes.io/os" instead`,
			},
		},
		{
			name: "PersistentVolumeReclaimRecycle deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeReclaimPolicy: api.PersistentVolumeReclaimRecycle,
				},
			},
			expected: []string{
				`spec.persistentVolumeReclaimPolicy: The Recycle reclaim policy is deprecated. Instead, the recommended approach is to use dynamic provisioning.`,
			},
		},
		{
			name: "PV CephFS deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						CephFS: &api.CephFSPersistentVolumeSource{
							Monitors:   nil,
							Path:       "",
							User:       "",
							SecretFile: "",
							SecretRef:  nil,
							ReadOnly:   false,
						},
					},
				},
			},
			expected: []string{
				`spec.cephfs: deprecated in v1.28, non-functional in v1.31+`,
			},
		},
		{
			name: "PV PhotonPersistentDisk deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						PhotonPersistentDisk: &api.PhotonPersistentDiskVolumeSource{
							PdID:   "",
							FSType: "",
						},
					},
				},
			},
			expected: []string{
				`spec.photonPersistentDisk: deprecated in v1.11, non-functional in v1.16+`,
			},
		},
		{
			name: "PV RBD deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						RBD: &api.RBDPersistentVolumeSource{
							CephMonitors: nil,
							RBDImage:     "",
							FSType:       "",
							RBDPool:      "",
							RadosUser:    "",
							Keyring:      "",
							SecretRef:    nil,
							ReadOnly:     false,
						},
					},
				},
			},
			expected: []string{
				`spec.rbd: deprecated in v1.28, non-functional in v1.31+`},
		},
		{
			name: "PV ScaleIO deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						ScaleIO: &api.ScaleIOPersistentVolumeSource{
							Gateway:          "",
							System:           "",
							SecretRef:        nil,
							SSLEnabled:       false,
							ProtectionDomain: "",
							StoragePool:      "",
							StorageMode:      "",
							VolumeName:       "",
							FSType:           "",
							ReadOnly:         false,
						},
					},
				},
			},
			expected: []string{
				`spec.scaleIO: deprecated in v1.16, non-functional in v1.22+`,
			},
		},
		{
			name: "PV StorageOS deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						StorageOS: &api.StorageOSPersistentVolumeSource{
							VolumeName:      "",
							VolumeNamespace: "",
							FSType:          "",
							ReadOnly:        false,
							SecretRef:       nil,
						},
					},
				},
			},
			expected: []string{
				`spec.storageOS: deprecated in v1.22, non-functional in v1.25+`,
			},
		},
		{
			name: "PV GlusterFS deprecation warning",
			template: &api.PersistentVolume{
				Spec: api.PersistentVolumeSpec{
					PersistentVolumeSource: api.PersistentVolumeSource{
						Glusterfs: &api.GlusterfsPersistentVolumeSource{
							EndpointsName:      "",
							Path:               "",
							ReadOnly:           false,
							EndpointsNamespace: nil,
						},
					},
				},
			},
			expected: []string{
				`spec.glusterfs: deprecated in v1.25, non-functional in v1.26+`,
			},
		},
	}

	for _, tc := range testcases {
		t.Run("podspec_"+tc.name, func(t *testing.T) {
			actual := sets.New[string](GetWarningsForPersistentVolume(tc.template)...)
			expected := sets.New[string](tc.expected...)
			for _, missing := range sets.List[string](expected.Difference(actual)) {
				t.Errorf("missing: %s", missing)
			}
			for _, extra := range sets.List[string](actual.Difference(expected)) {
				t.Errorf("extra: %s", extra)
			}
		})

	}
}