package e2e

import (
	"context"
	"fmt"
	"strings"
	"time"

	snapapi "github.com/kubernetes-csi/external-snapshotter/client/v4/apis/volumesnapshot/v1"
	snapclient "github.com/kubernetes-csi/external-snapshotter/client/v4/clientset/versioned/typed/volumesnapshot/v1"
	. "github.com/onsi/gomega" // nolint
	v1 "k8s.io/api/core/v1"
	apierrs "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/kubernetes/test/e2e/framework"
	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
)

func getSnapshotClass(path string) snapapi.VolumeSnapshotClass {
	sc := snapapi.VolumeSnapshotClass{}
	err := unmarshal(path, &sc)
	Expect(err).Should(BeNil())

	return sc
}

func getSnapshot(path string) snapapi.VolumeSnapshot {
	sc := snapapi.VolumeSnapshot{}
	err := unmarshal(path, &sc)
	Expect(err).Should(BeNil())

	return sc
}

func newSnapshotClient() (*snapclient.SnapshotV1Client, error) {
	config, err := framework.LoadConfig()
	if err != nil {
		return nil, fmt.Errorf("error creating client: %w", err)
	}
	c, err := snapclient.NewForConfig(config)
	if err != nil {
		return nil, fmt.Errorf("error creating snapshot client: %w", err)
	}

	return c, err
}

func createSnapshot(snap *snapapi.VolumeSnapshot, t int) error {
	sclient, err := newSnapshotClient()
	if err != nil {
		return err
	}

	_, err = sclient.
		VolumeSnapshots(snap.Namespace).
		Create(context.TODO(), snap, metav1.CreateOptions{})
	if err != nil {
		return fmt.Errorf("failed to create volumesnapshot: %w", err)
	}
	e2elog.Logf("snapshot with name %v created in %v namespace", snap.Name, snap.Namespace)

	timeout := time.Duration(t) * time.Minute
	name := snap.Name
	start := time.Now()
	e2elog.Logf("waiting for %v to be in ready state", snap)

	return wait.PollImmediate(poll, timeout, func() (bool, error) {
		e2elog.Logf("waiting for snapshot %s (%d seconds elapsed)", snap.Name, int(time.Since(start).Seconds()))
		snaps, err := sclient.
			VolumeSnapshots(snap.Namespace).
			Get(context.TODO(), name, metav1.GetOptions{})
		if err != nil {
			e2elog.Logf("Error getting snapshot in namespace: '%s': %v", snap.Namespace, err)
			if isRetryableAPIError(err) {
				return false, nil
			}
			if apierrs.IsNotFound(err) {
				return false, nil
			}

			return false, fmt.Errorf("failed to get volumesnapshot: %w", err)
		}
		if snaps.Status == nil || snaps.Status.ReadyToUse == nil {
			return false, nil
		}
		if *snaps.Status.ReadyToUse {
			return true, nil
		}
		e2elog.Logf("snapshot %s in %v state", snap.Name, *snaps.Status.ReadyToUse)

		return false, nil
	})
}

func deleteSnapshot(snap *snapapi.VolumeSnapshot, t int) error {
	sclient, err := newSnapshotClient()
	if err != nil {
		return err
	}

	err = sclient.
		VolumeSnapshots(snap.Namespace).
		Delete(context.TODO(), snap.Name, metav1.DeleteOptions{})
	if err != nil {
		return fmt.Errorf("failed to delete volumesnapshot: %w", err)
	}

	timeout := time.Duration(t) * time.Minute
	name := snap.Name
	start := time.Now()
	e2elog.Logf("Waiting up to %v to be deleted", snap)

	return wait.PollImmediate(poll, timeout, func() (bool, error) {
		e2elog.Logf("deleting snapshot %s (%d seconds elapsed)", name, int(time.Since(start).Seconds()))
		_, err := sclient.
			VolumeSnapshots(snap.Namespace).
			Get(context.TODO(), name, metav1.GetOptions{})
		if err == nil {
			return false, nil
		}

		if isRetryableAPIError(err) {
			return false, nil
		}
		if !apierrs.IsNotFound(err) {
			return false, fmt.Errorf(
				"get on deleted snapshot %v failed : other than \"not found\": %w",
				name,
				err)
		}

		return true, nil
	})
}

func createRBDSnapshotClass(f *framework.Framework) error {
	scPath := fmt.Sprintf("%s/%s", rbdExamplePath, "snapshotclass.yaml")
	sc := getSnapshotClass(scPath)

	sc.Parameters["csi.storage.k8s.io/snapshotter-secret-namespace"] = cephCSINamespace
	sc.Parameters["csi.storage.k8s.io/snapshotter-secret-name"] = rbdProvisionerSecretName

	fsID, stdErr, err := execCommandInToolBoxPod(f, "ceph fsid", rookNamespace)
	if err != nil {
		return err
	}
	if stdErr != "" {
		return fmt.Errorf("failed to get fsid from ceph cluster %s", stdErr)
	}
	fsID = strings.Trim(fsID, "\n")
	sc.Parameters["clusterID"] = fsID
	sclient, err := newSnapshotClient()
	if err != nil {
		return err
	}
	_, err = sclient.VolumeSnapshotClasses().Create(context.TODO(), &sc, metav1.CreateOptions{})

	return err
}

func deleteRBDSnapshotClass() error {
	scPath := fmt.Sprintf("%s/%s", rbdExamplePath, "snapshotclass.yaml")
	sc := getSnapshotClass(scPath)

	sclient, err := newSnapshotClient()
	if err != nil {
		return err
	}

	return sclient.VolumeSnapshotClasses().Delete(context.TODO(), sc.Name, metav1.DeleteOptions{})
}

func createCephFSSnapshotClass(f *framework.Framework) error {
	scPath := fmt.Sprintf("%s/%s", cephFSExamplePath, "snapshotclass.yaml")
	sc := getSnapshotClass(scPath)
	sc.Parameters["csi.storage.k8s.io/snapshotter-secret-namespace"] = cephCSINamespace
	sc.Parameters["csi.storage.k8s.io/snapshotter-secret-name"] = cephFSProvisionerSecretName
	fsID, stdErr, err := execCommandInToolBoxPod(f, "ceph fsid", rookNamespace)
	if err != nil {
		return err
	}
	if stdErr != "" {
		return fmt.Errorf("failed to get fsid from ceph cluster %s", stdErr)
	}
	fsID = strings.Trim(fsID, "\n")
	sc.Parameters["clusterID"] = fsID
	sclient, err := newSnapshotClient()
	if err != nil {
		return err
	}
	_, err = sclient.VolumeSnapshotClasses().Create(context.TODO(), &sc, metav1.CreateOptions{})
	if err != nil {
		return fmt.Errorf("failed to create volumesnapshotclass: %w", err)
	}

	return err
}

func getVolumeSnapshotContent(namespace, snapshotName string) (*snapapi.VolumeSnapshotContent, error) {
	sclient, err := newSnapshotClient()
	if err != nil {
		return nil, err
	}

	snapshot, err := sclient.
		VolumeSnapshots(namespace).
		Get(context.TODO(), snapshotName, metav1.GetOptions{})
	if err != nil {
		return nil, fmt.Errorf("failed to get volumesnapshot: %w", err)
	}

	volumeSnapshotContent, err := sclient.
		VolumeSnapshotContents().
		Get(context.TODO(), *snapshot.Status.BoundVolumeSnapshotContentName, metav1.GetOptions{})
	if err != nil {
		return nil, fmt.Errorf("failed to get volumesnapshotcontent: %w", err)
	}

	return volumeSnapshotContent, nil
}

func validateBiggerPVCFromSnapshot(f *framework.Framework,
	pvcPath,
	appPath,
	snapPath,
	pvcClonePath,
	appClonePath string) error {
	const (
		size    = "1Gi"
		newSize = "2Gi"
	)
	pvc, err := loadPVC(pvcPath)
	if err != nil {
		return fmt.Errorf("failed to load PVC: %w", err)
	}
	label := make(map[string]string)
	pvc.Namespace = f.UniqueName
	pvc.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(size)
	app, err := loadApp(appPath)
	if err != nil {
		return fmt.Errorf("failed to load app: %w", err)
	}
	label[appKey] = appLabel
	app.Namespace = f.UniqueName
	app.Labels = label
	opt := metav1.ListOptions{
		LabelSelector: fmt.Sprintf("%s=%s", appKey, label[appKey]),
	}
	err = createPVCAndApp("", f, pvc, app, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to create pvc and application: %w", err)
	}

	snap := getSnapshot(snapPath)
	snap.Namespace = f.UniqueName
	snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
	err = createSnapshot(&snap, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to create snapshot: %w", err)
	}
	err = deletePVCAndApp("", f, pvc, app)
	if err != nil {
		return fmt.Errorf("failed to delete pvc and application: %w", err)
	}
	pvcClone, err := loadPVC(pvcClonePath)
	if err != nil {
		e2elog.Failf("failed to load PVC: %v", err)
	}
	pvcClone.Namespace = f.UniqueName
	pvcClone.Spec.DataSource.Name = snap.Name
	pvcClone.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(newSize)
	appClone, err := loadApp(appClonePath)
	if err != nil {
		e2elog.Failf("failed to load application: %v", err)
	}
	appClone.Namespace = f.UniqueName
	appClone.Labels = label
	err = createPVCAndApp("", f, pvcClone, appClone, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to create pvc clone and application: %w", err)
	}
	err = deleteSnapshot(&snap, deployTimeout)
	if err != nil {
		return fmt.Errorf("failed to delete snapshot: %w", err)
	}
	if pvcClone.Spec.VolumeMode == nil || *pvcClone.Spec.VolumeMode == v1.PersistentVolumeFilesystem {
		err = checkDirSize(appClone, f, &opt, newSize)
		if err != nil {
			return fmt.Errorf("failed to validate directory size: %w", err)
		}
	}

	if pvcClone.Spec.VolumeMode != nil && *pvcClone.Spec.VolumeMode == v1.PersistentVolumeBlock {
		err = checkDeviceSize(appClone, f, &opt, newSize)
		if err != nil {
			return fmt.Errorf("failed to validate device size: %w", err)
		}
	}
	err = deletePVCAndApp("", f, pvcClone, appClone)
	if err != nil {
		return fmt.Errorf("failed to delete pvc and application: %w", err)
	}

	return nil
}