/*
Copyright the Velero contributors.

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 restore

import (
	"context"
	"sort"
	"testing"

	"github.com/sirupsen/logrus"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	corev1api "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/fake"

	veleroimage "github.com/vmware-tanzu/velero/internal/velero"
	velerov1api "github.com/vmware-tanzu/velero/pkg/apis/velero/v1"
	"github.com/vmware-tanzu/velero/pkg/builder"
	"github.com/vmware-tanzu/velero/pkg/buildinfo"
	velerofake "github.com/vmware-tanzu/velero/pkg/generated/clientset/versioned/fake"
	"github.com/vmware-tanzu/velero/pkg/plugin/velero"
	velerotest "github.com/vmware-tanzu/velero/pkg/test"
	"github.com/vmware-tanzu/velero/pkg/util/kube"
)

func TestGetImage(t *testing.T) {
	configMapWithData := func(key, val string) *corev1api.ConfigMap {
		return &corev1api.ConfigMap{
			Data: map[string]string{
				key: val,
			},
		}
	}

	defaultImage := veleroimage.DefaultResticRestoreHelperImage()

	tests := []struct {
		name             string
		configMap        *corev1api.ConfigMap
		buildInfoVersion string
		want             string
	}{
		{
			name:      "nil config map returns default image",
			configMap: nil,
			want:      defaultImage,
		},
		{
			name:      "config map without 'image' key returns default image",
			configMap: configMapWithData("non-matching-key", "val"),
			want:      defaultImage,
		},
		{
			name:      "config map without '/' in image name returns default image",
			configMap: configMapWithData("image", "my-image"),
			want:      defaultImage,
		},
		{
			name:             "config map with untagged image returns image with buildinfo.Version as tag",
			configMap:        configMapWithData("image", "myregistry.io/my-image"),
			buildInfoVersion: "buildinfo-version",
			want:             "myregistry.io/my-image:buildinfo-version",
		},
		{
			name:             "config map with untagged image and custom registry port with ':' returns image with buildinfo.Version as tag",
			configMap:        configMapWithData("image", "myregistry.io:34567/my-image"),
			buildInfoVersion: "buildinfo-version",
			want:             "myregistry.io:34567/my-image:buildinfo-version",
		},
		{
			name:      "config map with tagged image returns tagged image",
			configMap: configMapWithData("image", "myregistry.io/my-image:my-tag"),
			want:      "myregistry.io/my-image:my-tag",
		},
		{
			name:      "config map with tagged image and custom registry port with ':' returns tagged image",
			configMap: configMapWithData("image", "myregistry.io:34567/my-image:my-tag"),
			want:      "myregistry.io:34567/my-image:my-tag",
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			if test.buildInfoVersion != "" {
				originalVersion := buildinfo.Version
				buildinfo.Version = test.buildInfoVersion
				defer func() {
					buildinfo.Version = originalVersion
				}()
			}
			assert.Equal(t, test.want, getImage(velerotest.NewLogger(), test.configMap))
		})
	}
}

// TestResticRestoreActionExecute tests the restic restore item action plugin's Execute method.
func TestResticRestoreActionExecute(t *testing.T) {
	resourceReqs, _ := kube.ParseResourceRequirements(
		defaultCPURequestLimit, defaultMemRequestLimit, // requests
		defaultCPURequestLimit, defaultMemRequestLimit, // limits
	)

	securityContext, _ := kube.ParseSecurityContext("", "", "", "")

	var (
		restoreName = "my-restore"
		backupName  = "test-backup"
		veleroNs    = "velero"
	)

	defaultResticRestoreHelperImage := veleroimage.DefaultResticRestoreHelperImage()

	tests := []struct {
		name             string
		pod              *corev1api.Pod
		podFromBackup    *corev1api.Pod
		podVolumeBackups []*velerov1api.PodVolumeBackup
		want             *corev1api.Pod
	}{
		{
			name: "Restoring pod with no other initContainers adds the restic initContainer",
			pod: builder.ForPod("ns-1", "my-pod").ObjectMeta(
				builder.WithAnnotations("snapshot.velero.io/myvol", "")).
				Result(),
			want: builder.ForPod("ns-1", "my-pod").
				ObjectMeta(
					builder.WithAnnotations("snapshot.velero.io/myvol", "")).
				InitContainers(
					newResticInitContainerBuilder(defaultResticRestoreHelperImage, "").
						Resources(&resourceReqs).
						SecurityContext(&securityContext).
						VolumeMounts(builder.ForVolumeMount("myvol", "/restores/myvol").Result()).
						Command([]string{"/velero-restic-restore-helper"}).Result()).Result(),
		},
		{
			name: "Restoring pod with other initContainers adds the restic initContainer as the first one",
			pod: builder.ForPod("ns-1", "my-pod").
				ObjectMeta(
					builder.WithAnnotations("snapshot.velero.io/myvol", "")).
				InitContainers(builder.ForContainer("first-container", "").Result()).
				Result(),
			want: builder.ForPod("ns-1", "my-pod").
				ObjectMeta(
					builder.WithAnnotations("snapshot.velero.io/myvol", "")).
				InitContainers(
					newResticInitContainerBuilder(defaultResticRestoreHelperImage, "").
						Resources(&resourceReqs).
						SecurityContext(&securityContext).
						VolumeMounts(builder.ForVolumeMount("myvol", "/restores/myvol").Result()).
						Command([]string{"/velero-restic-restore-helper"}).Result(),
					builder.ForContainer("first-container", "").Result()).
				Result(),
		},
		{
			name: "Restoring pod with other initContainers adds the restic initContainer as the first one using PVB to identify the volumes and not annotations",
			pod: builder.ForPod("ns-1", "my-pod").
				Volumes(
					builder.ForVolume("vol-1").PersistentVolumeClaimSource("pvc-1").Result(),
					builder.ForVolume("vol-2").PersistentVolumeClaimSource("pvc-2").Result(),
				).
				ObjectMeta(
					builder.WithAnnotations("snapshot.velero.io/not-used", "")).
				InitContainers(builder.ForContainer("first-container", "").Result()).
				Result(),
			podVolumeBackups: []*velerov1api.PodVolumeBackup{
				builder.ForPodVolumeBackup(veleroNs, "pvb-1").
					PodName("my-pod").
					PodNamespace("ns-1").
					Volume("vol-1").
					ObjectMeta(builder.WithLabels(velerov1api.BackupNameLabel, backupName)).
					SnapshotID("foo").
					Result(),
				builder.ForPodVolumeBackup(veleroNs, "pvb-2").
					PodName("my-pod").
					PodNamespace("ns-1").
					Volume("vol-2").
					ObjectMeta(builder.WithLabels(velerov1api.BackupNameLabel, backupName)).
					SnapshotID("foo").
					Result(),
			},
			want: builder.ForPod("ns-1", "my-pod").
				Volumes(
					builder.ForVolume("vol-1").PersistentVolumeClaimSource("pvc-1").Result(),
					builder.ForVolume("vol-2").PersistentVolumeClaimSource("pvc-2").Result(),
				).
				ObjectMeta(
					builder.WithAnnotations("snapshot.velero.io/not-used", "")).
				InitContainers(
					newResticInitContainerBuilder(defaultResticRestoreHelperImage, "").
						Resources(&resourceReqs).
						SecurityContext(&securityContext).
						VolumeMounts(builder.ForVolumeMount("vol-1", "/restores/vol-1").Result(), builder.ForVolumeMount("vol-2", "/restores/vol-2").Result()).
						Command([]string{"/velero-restic-restore-helper"}).Result(),
					builder.ForContainer("first-container", "").Result()).
				Result(),
		},
		{
			name: "Restoring pod in another namespace adds the restic initContainer and uses the namespace of the backup pod for matching PVBs",
			pod: builder.ForPod("new-ns", "my-pod").
				Volumes(
					builder.ForVolume("vol-1").PersistentVolumeClaimSource("pvc-1").Result(),
					builder.ForVolume("vol-2").PersistentVolumeClaimSource("pvc-2").Result(),
				).
				Result(),
			podFromBackup: builder.ForPod("original-ns", "my-pod").
				Volumes(
					builder.ForVolume("vol-1").PersistentVolumeClaimSource("pvc-1").Result(),
					builder.ForVolume("vol-2").PersistentVolumeClaimSource("pvc-2").Result(),
				).
				Result(),
			podVolumeBackups: []*velerov1api.PodVolumeBackup{
				builder.ForPodVolumeBackup(veleroNs, "pvb-1").
					PodName("my-pod").
					PodNamespace("original-ns").
					Volume("vol-1").
					ObjectMeta(builder.WithLabels(velerov1api.BackupNameLabel, backupName)).
					SnapshotID("foo").
					Result(),
				builder.ForPodVolumeBackup(veleroNs, "pvb-2").
					PodName("my-pod").
					PodNamespace("original-ns").
					Volume("vol-2").
					ObjectMeta(builder.WithLabels(velerov1api.BackupNameLabel, backupName)).
					SnapshotID("foo").
					Result(),
			},
			want: builder.ForPod("new-ns", "my-pod").
				Volumes(
					builder.ForVolume("vol-1").PersistentVolumeClaimSource("pvc-1").Result(),
					builder.ForVolume("vol-2").PersistentVolumeClaimSource("pvc-2").Result(),
				).
				InitContainers(
					newResticInitContainerBuilder(defaultResticRestoreHelperImage, "").
						Resources(&resourceReqs).
						SecurityContext(&securityContext).
						VolumeMounts(builder.ForVolumeMount("vol-1", "/restores/vol-1").Result(), builder.ForVolumeMount("vol-2", "/restores/vol-2").Result()).
						Command([]string{"/velero-restic-restore-helper"}).Result()).
				Result(),
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			clientset := fake.NewSimpleClientset()
			clientsetVelero := velerofake.NewSimpleClientset()

			for _, podVolumeBackup := range tc.podVolumeBackups {
				_, err := clientsetVelero.VeleroV1().PodVolumeBackups(veleroNs).Create(context.TODO(), podVolumeBackup, metav1.CreateOptions{})
				require.NoError(t, err)
			}

			unstructuredPod, err := runtime.DefaultUnstructuredConverter.ToUnstructured(tc.pod)
			require.NoError(t, err)

			// Default to using the same pod for both Item and ItemFromBackup if podFromBackup not provided
			var unstructuredPodFromBackup map[string]interface{}
			if tc.podFromBackup != nil {
				unstructuredPodFromBackup, err = runtime.DefaultUnstructuredConverter.ToUnstructured(tc.podFromBackup)
				require.NoError(t, err)
			} else {
				unstructuredPodFromBackup = unstructuredPod
			}

			input := &velero.RestoreItemActionExecuteInput{
				Item: &unstructured.Unstructured{
					Object: unstructuredPod,
				},
				ItemFromBackup: &unstructured.Unstructured{
					Object: unstructuredPodFromBackup,
				},
				Restore: builder.ForRestore(veleroNs, restoreName).
					Backup(backupName).
					Phase(velerov1api.RestorePhaseInProgress).
					Result(),
			}

			a := NewResticRestoreAction(
				logrus.StandardLogger(),
				clientset.CoreV1().ConfigMaps(veleroNs),
				clientsetVelero.VeleroV1().PodVolumeBackups(veleroNs),
			)

			// method under test
			res, err := a.Execute(input)
			assert.NoError(t, err)

			updatedPod := new(corev1api.Pod)
			require.NoError(t, runtime.DefaultUnstructuredConverter.FromUnstructured(res.UpdatedItem.UnstructuredContent(), updatedPod))

			for _, container := range tc.want.Spec.InitContainers {
				sort.Slice(container.VolumeMounts, func(i, j int) bool {
					return container.VolumeMounts[i].Name < container.VolumeMounts[j].Name
				})
			}
			for _, container := range updatedPod.Spec.InitContainers {
				sort.Slice(container.VolumeMounts, func(i, j int) bool {
					return container.VolumeMounts[i].Name < container.VolumeMounts[j].Name
				})
			}

			assert.Equal(t, tc.want, updatedPod)
		})
	}
}

func TestGetCommand(t *testing.T) {
	configMapWithData := func(key, val string) *corev1api.ConfigMap {
		return &corev1api.ConfigMap{
			Data: map[string]string{
				key: val,
			},
		}
	}
	testCases := []struct {
		name      string
		configMap *corev1api.ConfigMap
		expected  []string
	}{
		{
			name:      "should get default command when config key is missing",
			configMap: configMapWithData("non-matching-key", "val"),
			expected:  []string{defaultCommand},
		},
		{
			name:      "should get default command when config key is empty",
			configMap: configMapWithData("command", ""),
			expected:  []string{defaultCommand},
		},
		{
			name:      "should get default command when config is nil",
			configMap: nil,
			expected:  []string{defaultCommand},
		},
		{
			name:      "should get command from config",
			configMap: configMapWithData("command", "foobarbz"),
			expected:  []string{"foobarbz"},
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			actual := getCommand(velerotest.NewLogger(), tc.configMap)
			assert.Equal(t, tc.expected, actual)
		})
	}
}