/*
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 kube

import (
	"context"
	"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"
	k8sruntime "k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/fake"
)

const testCopyLabel = "velero.io/backup-pvc-secret"

func TestCopySecret(t *testing.T) {
	log := logrus.New()

	tests := []struct {
		name        string
		secretName  string
		sourceNS    string
		targetNS    string
		ownerName   string
		objects     []k8sruntime.Object
		expectErr   bool
		errContains string
	}{
		{
			name:       "successfully copies secret to target namespace",
			secretName: "ceph-csi-kms-token",
			sourceNS:   "app-ns",
			targetNS:   "velero",
			ownerName:  "du-123",
			objects: []k8sruntime.Object{
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-token", Namespace: "app-ns"},
					Data:       map[string][]byte{"token": []byte("vault-token-a")},
					Type:       corev1api.SecretTypeOpaque,
				},
			},
		},
		{
			name:        "returns error when source secret does not exist",
			secretName:  "missing-secret",
			sourceNS:    "app-ns",
			targetNS:    "velero",
			ownerName:   "du-123",
			objects:     []k8sruntime.Object{},
			expectErr:   true,
			errContains: "error getting secret",
		},
		{
			name:       "no-op when target already has secret with same data and same owner",
			secretName: "ceph-csi-kms-token",
			sourceNS:   "app-ns",
			targetNS:   "velero",
			ownerName:  "du-123",
			objects: []k8sruntime.Object{
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-token", Namespace: "app-ns"},
					Data:       map[string][]byte{"token": []byte("same-token")},
					Type:       corev1api.SecretTypeOpaque,
				},
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{
						Name: "ceph-csi-kms-token", Namespace: "velero",
						Labels: map[string]string{testCopyLabel: "du-123"},
					},
					Data: map[string][]byte{"token": []byte("same-token")},
					Type: corev1api.SecretTypeOpaque,
				},
			},
		},
		{
			name:       "returns collision when same data but different owner",
			secretName: "ceph-csi-kms-token",
			sourceNS:   "app-ns",
			targetNS:   "velero",
			ownerName:  "du-456",
			objects: []k8sruntime.Object{
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-token", Namespace: "app-ns"},
					Data:       map[string][]byte{"token": []byte("same-token")},
					Type:       corev1api.SecretTypeOpaque,
				},
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{
						Name: "ceph-csi-kms-token", Namespace: "velero",
						Labels: map[string]string{testCopyLabel: "du-123"},
					},
					Data: map[string][]byte{"token": []byte("same-token")},
					Type: corev1api.SecretTypeOpaque,
				},
			},
			expectErr:   true,
			errContains: "collision",
		},
		{
			name:       "returns collision error when target has secret with different data",
			secretName: "ceph-csi-kms-token",
			sourceNS:   "app-ns",
			targetNS:   "velero",
			ownerName:  "du-123",
			objects: []k8sruntime.Object{
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-token", Namespace: "app-ns"},
					Data:       map[string][]byte{"token": []byte("token-a")},
					Type:       corev1api.SecretTypeOpaque,
				},
				&corev1api.Secret{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-token", Namespace: "velero"},
					Data:       map[string][]byte{"token": []byte("token-b")},
					Type:       corev1api.SecretTypeOpaque,
				},
			},
			expectErr:   true,
			errContains: "secret collision",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			fakeClient := fake.NewSimpleClientset(tt.objects...)

			err := CopySecret(context.Background(), fakeClient.CoreV1(),
				tt.secretName, tt.sourceNS, tt.targetNS,
				map[string]string{testCopyLabel: tt.ownerName}, log)

			if tt.expectErr {
				require.Error(t, err)
				if tt.errContains != "" {
					assert.Contains(t, err.Error(), tt.errContains)
				}
				return
			}

			require.NoError(t, err)

			copied, getErr := fakeClient.CoreV1().Secrets(tt.targetNS).Get(
				context.Background(), tt.secretName, metav1.GetOptions{})
			require.NoError(t, getErr)
			assert.NotNil(t, copied)
		})
	}
}

func TestDeleteSecretsWithLabel(t *testing.T) {
	log := logrus.New()

	fakeClient := fake.NewSimpleClientset(
		&corev1api.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Name: "secret-1", Namespace: "velero",
				Labels: map[string]string{testCopyLabel: "du-123"},
			},
		},
		&corev1api.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Name: "secret-2", Namespace: "velero",
				Labels: map[string]string{testCopyLabel: "du-456"},
			},
		},
	)

	DeleteSecretsWithLabel(context.Background(), fakeClient.CoreV1(), "velero",
		testCopyLabel, "du-123", log)

	_, err := fakeClient.CoreV1().Secrets("velero").Get(
		context.Background(), "secret-1", metav1.GetOptions{})
	require.Error(t, err, "secret-1 should be deleted")

	_, err = fakeClient.CoreV1().Secrets("velero").Get(
		context.Background(), "secret-2", metav1.GetOptions{})
	assert.NoError(t, err, "secret-2 should still exist")
}

func TestCopyConfigMap(t *testing.T) {
	log := logrus.New()

	tests := []struct {
		name        string
		cmName      string
		sourceNS    string
		targetNS    string
		ownerName   string
		objects     []k8sruntime.Object
		expectErr   bool
		errContains string
	}{
		{
			name:      "successfully copies configmap to target namespace",
			cmName:    "ceph-csi-kms-config",
			sourceNS:  "app-ns",
			targetNS:  "velero",
			ownerName: "du-123",
			objects: []k8sruntime.Object{
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "app-ns"},
					Data:       map[string]string{"vaultAddress": "https://vault.example.com"},
				},
			},
		},
		{
			name:        "returns error when source configmap does not exist",
			cmName:      "missing-cm",
			sourceNS:    "app-ns",
			targetNS:    "velero",
			ownerName:   "du-123",
			objects:     []k8sruntime.Object{},
			expectErr:   true,
			errContains: "error getting configmap",
		},
		{
			name:      "no-op when target already has configmap with same data and same owner",
			cmName:    "ceph-csi-kms-config",
			sourceNS:  "app-ns",
			targetNS:  "velero",
			ownerName: "du-123",
			objects: []k8sruntime.Object{
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "app-ns"},
					Data:       map[string]string{"vaultAddress": "https://vault.example.com"},
				},
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{
						Name: "ceph-csi-kms-config", Namespace: "velero",
						Labels: map[string]string{testCopyLabel: "du-123"},
					},
					Data: map[string]string{"vaultAddress": "https://vault.example.com"},
				},
			},
		},
		{
			name:      "returns collision when same data but different owner",
			cmName:    "ceph-csi-kms-config",
			sourceNS:  "app-ns",
			targetNS:  "velero",
			ownerName: "du-456",
			objects: []k8sruntime.Object{
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "app-ns"},
					Data:       map[string]string{"vaultAddress": "https://vault.example.com"},
				},
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{
						Name: "ceph-csi-kms-config", Namespace: "velero",
						Labels: map[string]string{testCopyLabel: "du-123"},
					},
					Data: map[string]string{"vaultAddress": "https://vault.example.com"},
				},
			},
			expectErr:   true,
			errContains: "collision",
		},
		{
			name:      "copies configmap with BinaryData",
			cmName:    "ceph-csi-kms-config",
			sourceNS:  "app-ns",
			targetNS:  "velero",
			ownerName: "du-123",
			objects: []k8sruntime.Object{
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "app-ns"},
					BinaryData: map[string][]byte{"ca.crt": []byte("binary-ca-bundle")},
				},
			},
		},
		{
			name:      "returns collision error when target has configmap with different data",
			cmName:    "ceph-csi-kms-config",
			sourceNS:  "app-ns",
			targetNS:  "velero",
			ownerName: "du-123",
			objects: []k8sruntime.Object{
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "app-ns"},
					Data:       map[string]string{"vaultAddress": "https://vault-a.example.com"},
				},
				&corev1api.ConfigMap{
					ObjectMeta: metav1.ObjectMeta{Name: "ceph-csi-kms-config", Namespace: "velero"},
					Data:       map[string]string{"vaultAddress": "https://vault-b.example.com"},
				},
			},
			expectErr:   true,
			errContains: "secret collision",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			fakeClient := fake.NewSimpleClientset(tt.objects...)

			err := CopyConfigMap(context.Background(), fakeClient.CoreV1(),
				tt.cmName, tt.sourceNS, tt.targetNS,
				map[string]string{testCopyLabel: tt.ownerName}, log)

			if tt.expectErr {
				require.Error(t, err)
				if tt.errContains != "" {
					assert.Contains(t, err.Error(), tt.errContains)
				}
				return
			}

			require.NoError(t, err)

			copied, getErr := fakeClient.CoreV1().ConfigMaps(tt.targetNS).Get(
				context.Background(), tt.cmName, metav1.GetOptions{})
			require.NoError(t, getErr)
			assert.NotNil(t, copied)
		})
	}
}

func TestDeleteConfigMapsWithLabel(t *testing.T) {
	log := logrus.New()

	fakeClient := fake.NewSimpleClientset(
		&corev1api.ConfigMap{
			ObjectMeta: metav1.ObjectMeta{
				Name: "cm-1", Namespace: "velero",
				Labels: map[string]string{testCopyLabel: "du-123"},
			},
		},
		&corev1api.ConfigMap{
			ObjectMeta: metav1.ObjectMeta{
				Name: "cm-2", Namespace: "velero",
				Labels: map[string]string{testCopyLabel: "du-456"},
			},
		},
	)

	DeleteConfigMapsWithLabel(context.Background(), fakeClient.CoreV1(), "velero",
		testCopyLabel, "du-123", log)

	_, err := fakeClient.CoreV1().ConfigMaps("velero").Get(
		context.Background(), "cm-1", metav1.GetOptions{})
	require.Error(t, err, "cm-1 should be deleted")

	_, err = fakeClient.CoreV1().ConfigMaps("velero").Get(
		context.Background(), "cm-2", metav1.GetOptions{})
	assert.NoError(t, err, "cm-2 should still exist")
}