package e2e

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	. "github.com/onsi/ginkgo" // nolint
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	clientset "k8s.io/client-go/kubernetes"
	"k8s.io/kubernetes/test/e2e/framework"
	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
)

var _ = Describe("CephFS Upgrade Testing", func() {
	f := framework.NewDefaultFramework("upgrade-test-cephfs")
	var (
		c        clientset.Interface
		pvc      *v1.PersistentVolumeClaim
		pvcClone *v1.PersistentVolumeClaim
		app      *v1.Pod
		appClone *v1.Pod
		// cwd stores the initial working directory.
		cwd string
		err error
		// checkSum stores the md5sum of a file to verify uniqueness.
		checkSum string
		// newCheckSum stores the md5sum of a file in the cloned pvc.
		newCheckSum string
	)
	const (
		pvcSize  = "2Gi"
		appKey   = "app"
		appLabel = "cephfs-upgrade-testing"
	)
	// deploy cephfs CSI
	BeforeEach(func() {
		if !upgradeTesting || !testCephFS {
			Skip("Skipping CephFS Upgrade Test")
		}
		c = f.ClientSet
		if cephCSINamespace != defaultNs {
			err = createNamespace(c, cephCSINamespace)
			if err != nil {
				e2elog.Failf("failed to create namespace with error %v", err)
			}
		}

		// fetch current working directory to switch back
		// when we are done upgrading.
		cwd, err = os.Getwd()
		if err != nil {
			e2elog.Failf("failed to getwd with error %v", err)
		}
		err = upgradeAndDeployCSI(upgradeVersion, "cephfs")
		if err != nil {
			e2elog.Failf("failed to upgrade csi with error %v", err)
		}
		err = createConfigMap(cephfsDirPath, f.ClientSet, f)
		if err != nil {
			e2elog.Failf("failed to create configmap with error %v", err)
		}
		err = createCephfsSecret(f.ClientSet, f)
		if err != nil {
			e2elog.Failf("failed to create secret with error %v", err)
		}
		err = createCephFSSnapshotClass(f)
		if err != nil {
			e2elog.Failf("failed to create snapshotclass with error %v", err)
		}
		err = createCephfsStorageClass(f.ClientSet, f, true, nil)
		if err != nil {
			e2elog.Failf("failed to create storageclass with error %v", err)
		}
	})
	AfterEach(func() {
		if !testCephFS || !upgradeTesting {
			Skip("Skipping CephFS Upgrade Test")
		}
		if CurrentGinkgoTestDescription().Failed {
			// log pods created by helm chart
			logsCSIPods("app=ceph-csi-cephfs", c)
			// log provisoner
			logsCSIPods("app=csi-cephfsplugin-provisioner", c)
			// log node plugin
			logsCSIPods("app=csi-cephfsplugin", c)
		}
		err = deleteConfigMap(cephfsDirPath)
		if err != nil {
			e2elog.Failf("failed to delete configmap with error %v", err)
		}
		err = deleteResource(cephfsExamplePath + "secret.yaml")
		if err != nil {
			e2elog.Failf("failed to delete secret with error %v", err)
		}
		err = deleteResource(cephfsExamplePath + "storageclass.yaml")
		if err != nil {
			e2elog.Failf("failed to delete storageclass with error %v", err)
		}
		err = deleteResource(cephfsExamplePath + "snapshotclass.yaml")
		if err != nil {
			e2elog.Failf("failed to delete storageclass with error %v", err)
		}
		if deployCephFS {
			deleteCephfsPlugin()
			if cephCSINamespace != defaultNs {
				err = deleteNamespace(c, cephCSINamespace)
				if err != nil {
					if err != nil {
						e2elog.Failf("failed to delete namespace with error %v", err)
					}
				}
			}
		}
	})

	Context("Cephfs Upgrade Test", func() {
		It("Cephfs Upgrade Test", func() {

			By("checking provisioner deployment is running", func() {
				err = waitForDeploymentComplete(cephfsDeploymentName, cephCSINamespace, f.ClientSet, deployTimeout)
				if err != nil {
					e2elog.Failf("timeout waiting for deployment %s with error %v", cephfsDeploymentName, err)
				}
			})
			By("checking nodeplugin deamonset pods are running", func() {
				err = waitForDaemonSets(cephfsDeamonSetName, cephCSINamespace, f.ClientSet, deployTimeout)
				if err != nil {
					e2elog.Failf("timeout waiting for daemonset %s with error%v", cephfsDeamonSetName, err)
				}
			})

			By("upgrade to latest changes and verify app re-mount", func() {
				// TODO: fetch pvc size from spec.
				pvcPath := cephfsExamplePath + "pvc.yaml"
				appPath := cephfsExamplePath + "pod.yaml"
				data := "check data persists"
				label := make(map[string]string)

				pvc, err = loadPVC(pvcPath)
				if err != nil {
					e2elog.Failf("failed to load pvc with error %v", err)
				}
				pvc.Namespace = f.UniqueName

				app, err = loadApp(appPath)
				if err != nil {
					e2elog.Failf("failed to load application with error %v", err)
				}
				label[appKey] = appLabel
				app.Namespace = f.UniqueName
				app.Labels = label
				pvc.Namespace = f.UniqueName
				pvc.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(pvcSize)
				err = createPVCAndApp("", f, pvc, app, deployTimeout)
				if err != nil {
					e2elog.Failf("failed to create pvc and application with error %v", err)
				}
				opt := metav1.ListOptions{
					LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
				}
				// fetch the path where volume is mounted.
				mountPath := app.Spec.Containers[0].VolumeMounts[0].MountPath
				filePath := filepath.Join(mountPath, "testClone")

				// create a test file at the mountPath.
				_, stdErr := execCommandInPodAndAllowFail(f, fmt.Sprintf("echo %s > %s", data, filePath), app.Namespace, &opt)
				if stdErr != "" {
					e2elog.Failf("failed to write data to a file %s", stdErr)
				}

				// force an immediate write of all cached data to disk.
				_, stdErr = execCommandInPodAndAllowFail(f, fmt.Sprintf("sync %s", filePath), app.Namespace, &opt)
				if stdErr != "" {
					e2elog.Failf("failed to sync data to a disk %s", stdErr)
				}

				e2elog.Logf("Calculating checksum of %s", filePath)
				checkSum, err = calculateSHA512sum(f, app, filePath, &opt)
				if err != nil {
					e2elog.Failf("failed to calculate checksum of %s", filePath)
				}

				// pvc clone is only supported from v1.16+
				if k8sVersionGreaterEquals(f.ClientSet, 1, 17) {
					// Create snapshot of the pvc
					snapshotPath := cephfsExamplePath + "snapshot.yaml"
					snap := getSnapshot(snapshotPath)
					snap.Name = "cephfs-pvc-snapshot"
					snap.Namespace = f.UniqueName
					snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
					err = createSnapshot(&snap, deployTimeout)
					if err != nil {
						e2elog.Failf("failed to create snapshot %v", err)
					}
				}
				err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
				if err != nil {
					e2elog.Failf("failed to delete application with error %v", err)
				}
				deleteCephfsPlugin()

				// switch back to current changes.
				err = os.Chdir(cwd)
				if err != nil {
					e2elog.Failf("failed to d chdir with error %v", err)
				}
				deployCephfsPlugin()

				app.Labels = label
				// validate if the app gets bound to a pvc created by
				// an earlier release.
				err = createApp(f.ClientSet, app, deployTimeout)
				if err != nil {
					e2elog.Failf("failed to create application with error %v", err)
				}
			})

			By("Create clone from a snapshot", func() {
				pvcClonePath := cephfsExamplePath + "pvc-restore.yaml"
				appClonePath := cephfsExamplePath + "pod-restore.yaml"
				label := make(map[string]string)

				// pvc clone is only supported from v1.16+
				if k8sVersionGreaterEquals(f.ClientSet, 1, 17) {
					pvcClone, err = loadPVC(pvcClonePath)
					if err != nil {
						e2elog.Failf("failed to load pvc with error %v", err)
					}
					pvcClone.Namespace = f.UniqueName
					pvcClone.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(pvcSize)
					appClone, err = loadApp(appClonePath)
					if err != nil {
						e2elog.Failf("failed to load application with error %v", err)
					}
					label[appKey] = "validate-snap-cephfs"
					appClone.Namespace = f.UniqueName
					appClone.Name = "snap-clone-cephfs"
					appClone.Labels = label
					err = createPVCAndApp("", f, pvcClone, appClone, deployTimeout)
					if err != nil {
						e2elog.Failf("failed to create pvc and application with error %v", err)
					}
					opt := metav1.ListOptions{
						LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
					}
					mountPath := appClone.Spec.Containers[0].VolumeMounts[0].MountPath
					testFilePath := filepath.Join(mountPath, "testClone")

					newCheckSum, err = calculateSHA512sum(f, appClone, testFilePath, &opt)
					if err != nil {
						e2elog.Failf("failed to calculate checksum of %s", testFilePath)
					}

					if strings.Compare(newCheckSum, checkSum) != 0 {
						e2elog.Failf("The checksum of files did not match, expected %s received %s  ", checkSum, newCheckSum)
					}
					e2elog.Logf("The checksum of files matched")

					// delete cloned pvc and pod
					err = deletePVCAndApp("", f, pvcClone, appClone)
					if err != nil {
						Fail(err.Error())
					}

					// Delete the snapshot of the parent pvc.
					snapshotPath := cephfsExamplePath + "snapshot.yaml"
					snap := getSnapshot(snapshotPath)
					snap.Name = "cephfs-pvc-snapshot"
					snap.Namespace = f.UniqueName
					snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
					err = deleteSnapshot(&snap, deployTimeout)
					if err != nil {
						e2elog.Failf("failed to delete snapshot %v", err)
					}

				}
			})

			By("Create clone from existing PVC", func() {
				pvcSmartClonePath := cephfsExamplePath + "pvc-clone.yaml"
				appSmartClonePath := cephfsExamplePath + "pod-clone.yaml"
				label := make(map[string]string)

				// pvc clone is only supported from v1.16+
				if k8sVersionGreaterEquals(f.ClientSet, 1, 16) {
					pvcClone, err = loadPVC(pvcSmartClonePath)
					if err != nil {
						e2elog.Failf("failed to load pvc with error %v", err)
					}
					pvcClone.Spec.DataSource.Name = pvc.Name
					pvcClone.Namespace = f.UniqueName
					pvcClone.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(pvcSize)
					appClone, err = loadApp(appSmartClonePath)
					if err != nil {
						e2elog.Failf("failed to load application with error %v", err)
					}
					label[appKey] = "validate-snap-cephfs"
					appClone.Namespace = f.UniqueName
					appClone.Name = "appclone"
					appClone.Labels = label
					err = createPVCAndApp("", f, pvcClone, appClone, deployTimeout)
					if err != nil {
						e2elog.Failf("failed to create pvc and application with error %v", err)
					}
					opt := metav1.ListOptions{
						LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
					}
					mountPath := appClone.Spec.Containers[0].VolumeMounts[0].MountPath
					testFilePath := filepath.Join(mountPath, "testClone")
					newCheckSum, err = calculateSHA512sum(f, appClone, testFilePath, &opt)
					if err != nil {
						e2elog.Failf("failed to calculate checksum of %s", testFilePath)
					}

					if strings.Compare(newCheckSum, checkSum) != 0 {
						e2elog.Failf("The checksum of files did not match, expected %s received %s", checkSum, newCheckSum)
					}
					e2elog.Logf("The checksum of files matched")

					// delete cloned pvc and pod
					err = deletePVCAndApp("", f, pvcClone, appClone)
					if err != nil {
						e2elog.Failf("failed to delete pvc and application with error %v", err)
					}

				}
			})

			By("Resize pvc and verify expansion", func() {
				pvcExpandSize := "5Gi"
				label := make(map[string]string)

				// Resize 0.3.0 is only supported from v1.15+
				if k8sVersionGreaterEquals(f.ClientSet, 1, 15) {
					label[appKey] = appLabel
					opt := metav1.ListOptions{
						LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
					}
					pvc, err = f.ClientSet.CoreV1().PersistentVolumeClaims(pvc.Namespace).Get(context.TODO(), pvc.Name, metav1.GetOptions{})
					if err != nil {
						e2elog.Failf("failed to get pvc with error %v", err)
					}

					// resize PVC
					err = expandPVCSize(f.ClientSet, pvc, pvcExpandSize, deployTimeout)
					if err != nil {
						e2elog.Failf("failed to expand pvc with error %v", err)
					}
					// wait for application pod to come up after resize
					err = waitForPodInRunningState(app.Name, app.Namespace, f.ClientSet, deployTimeout)
					if err != nil {
						e2elog.Failf("timeout waiting for pod to be in running state with error %v", err)
					}
					// validate if resize is successful.
					err = checkDirSize(app, f, &opt, pvcExpandSize)
					if err != nil {
						e2elog.Failf("failed to check directory size with error %v", err)
					}
				}

			})

			By("delete pvc and app")
			err = deletePVCAndApp("", f, pvc, app)
			if err != nil {
				e2elog.Failf("failed to delete pvc and application with error %v", err)
			}
		})
	})
})