/*
Copyright 2022 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 csi_mock

import (
	"context"
	"fmt"
	"math/rand"
	"strconv"

	"github.com/onsi/ginkgo/v2"
	"github.com/onsi/gomega"
	storagev1 "k8s.io/api/storage/v1"
	"k8s.io/kubernetes/test/e2e/framework"
	e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
	e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
	e2evolume "k8s.io/kubernetes/test/e2e/framework/volume"
	"k8s.io/kubernetes/test/e2e/storage/utils"
	admissionapi "k8s.io/pod-security-admission/api"
)

var _ = utils.SIGDescribe("CSI Mock volume fsgroup policies", func() {
	f := framework.NewDefaultFramework("csi-mock-volumes-fsgroup-policy")
	f.NamespacePodSecurityLevel = admissionapi.LevelPrivileged
	m := newMockDriverSetup(f)

	// These tests *only* work on a cluster which has the CSIVolumeFSGroupPolicy feature enabled.
	ginkgo.Context("CSI FSGroupPolicy [LinuxOnly]", func() {
		tests := []struct {
			name          string
			fsGroupPolicy storagev1.FSGroupPolicy
			modified      bool
		}{
			{
				name:          "should modify fsGroup if fsGroupPolicy=default",
				fsGroupPolicy: storagev1.ReadWriteOnceWithFSTypeFSGroupPolicy,
				modified:      true,
			},
			{
				name:          "should modify fsGroup if fsGroupPolicy=File",
				fsGroupPolicy: storagev1.FileFSGroupPolicy,
				modified:      true,
			},
			{
				name:          "should not modify fsGroup if fsGroupPolicy=None",
				fsGroupPolicy: storagev1.NoneFSGroupPolicy,
				modified:      false,
			},
		}
		for _, t := range tests {
			test := t
			ginkgo.It(test.name, func(ctx context.Context) {
				if framework.NodeOSDistroIs("windows") {
					e2eskipper.Skipf("FSGroupPolicy is only applied on linux nodes -- skipping")
				}
				m.init(ctx, testParameters{
					disableAttach:  true,
					registerDriver: true,
					fsGroupPolicy:  &test.fsGroupPolicy,
				})
				ginkgo.DeferCleanup(m.cleanup)

				waitUtilFSGroupInPod(ctx, m, test.modified)

				// The created resources will be removed by the cleanup() function,
				// so need to delete anything here.
			})
		}
	})

	ginkgo.Context("CSI FSGroupPolicy Update [LinuxOnly]", func() {
		tests := []struct {
			name             string
			oldFSGroupPolicy storagev1.FSGroupPolicy
			newFSGroupPolicy storagev1.FSGroupPolicy
		}{
			{
				name:             "should update fsGroup if update from None to File",
				oldFSGroupPolicy: storagev1.NoneFSGroupPolicy,
				newFSGroupPolicy: storagev1.FileFSGroupPolicy,
			},
			{
				name:             "should update fsGroup if update from None to default",
				oldFSGroupPolicy: storagev1.NoneFSGroupPolicy,
				newFSGroupPolicy: storagev1.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			{
				name:             "should not update fsGroup if update from File to None",
				oldFSGroupPolicy: storagev1.FileFSGroupPolicy,
				newFSGroupPolicy: storagev1.NoneFSGroupPolicy,
			},
			{
				name:             "should update fsGroup if update from File to default",
				oldFSGroupPolicy: storagev1.FileFSGroupPolicy,
				newFSGroupPolicy: storagev1.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			{
				name:             "should not update fsGroup if update from detault to None",
				oldFSGroupPolicy: storagev1.ReadWriteOnceWithFSTypeFSGroupPolicy,
				newFSGroupPolicy: storagev1.NoneFSGroupPolicy,
			},
			{
				name:             "should update fsGroup if update from detault to File",
				oldFSGroupPolicy: storagev1.ReadWriteOnceWithFSTypeFSGroupPolicy,
				newFSGroupPolicy: storagev1.FileFSGroupPolicy,
			},
		}
		for _, t := range tests {
			test := t
			ginkgo.It(test.name, func(ctx context.Context) {
				if framework.NodeOSDistroIs("windows") {
					e2eskipper.Skipf("FSGroupPolicy is only applied on linux nodes -- skipping")
				}
				m.init(ctx, testParameters{
					disableAttach:  true,
					registerDriver: true,
					fsGroupPolicy:  &test.oldFSGroupPolicy,
				})
				ginkgo.DeferCleanup(m.cleanup)

				waitUtilFSGroupInPod(ctx, m, test.oldFSGroupPolicy != storagev1.NoneFSGroupPolicy)
				m.update(utils.PatchCSIOptions{FSGroupPolicy: &test.newFSGroupPolicy})
				waitUtilFSGroupInPod(ctx, m, test.newFSGroupPolicy != storagev1.NoneFSGroupPolicy)

				// The created resources will be removed by the cleanup() function,
				// so need to delete anything here.
			})
		}
	})
})

func waitUtilFSGroupInPod(ctx context.Context, m *mockDriverSetup, modified bool) {
	var err error

	utils.WaitUntil(framework.Poll, framework.PodStartTimeout, func() bool {
		err = gomega.InterceptGomegaFailure(func() {
			fsGroupVal := int64(rand.Int63n(20000) + 1024)
			fsGroup := &fsGroupVal

			_, _, pod := m.createPodWithFSGroup(ctx, fsGroup) /* persistent volume */
			defer func() {
				err = e2epod.DeletePodWithWait(context.TODO(), m.f.ClientSet, pod)
				framework.ExpectNoError(err, "failed: deleting the pod: %s", err)
			}()

			mountPath := pod.Spec.Containers[0].VolumeMounts[0].MountPath
			dirName := mountPath + "/" + m.f.UniqueName
			fileName := dirName + "/" + m.f.UniqueName

			err = e2epod.WaitForPodNameRunningInNamespace(ctx, m.cs, pod.Name, pod.Namespace)
			framework.ExpectNoError(err, "failed to start pod")

			// Create the subdirectory to ensure that fsGroup propagates
			createDirectory := fmt.Sprintf("mkdir %s", dirName)
			_, _, err = e2evolume.PodExec(m.f, pod, createDirectory)
			framework.ExpectNoError(err, "failed: creating the directory: %s", err)

			// Inject the contents onto the mount
			createFile := fmt.Sprintf("echo '%s' > '%s'; sync", "filecontents", fileName)
			_, _, err = e2evolume.PodExec(m.f, pod, createFile)
			framework.ExpectNoError(err, "failed: writing the contents: %s", err)

			// Delete the created file. This step is mandatory, as the mock driver
			// won't clean up the contents automatically.
			defer func() {
				deleteDir := fmt.Sprintf("rm -fr %s", dirName)
				_, _, err = e2evolume.PodExec(m.f, pod, deleteDir)
				framework.ExpectNoError(err, "failed: deleting the directory: %s", err)
			}()

			// Ensure that the fsGroup matches what we expect
			if modified {
				utils.VerifyFSGroupInPod(m.f, fileName, strconv.FormatInt(*fsGroup, 10), pod)
			} else {
				utils.VerifyFSGroupInPod(m.f, fileName, "root", pod)
			}
		})

		return err == nil
	})

	framework.ExpectNoError(err, "failed: verifing fsgroup in pod: %s", err)
}