/*
Copyright 2020 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 k8sorchestrator

import (
	"context"
	"errors"
	"fmt"
	"strings"

	v1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/vsphere-csi-driver/pkg/csi/service/common"
	"sigs.k8s.io/vsphere-csi-driver/pkg/csi/service/logger"
)

// getPVCAnnotations fetches annotations from PVC bound to passed volumeID and returns
// annotation key-value pairs as a map
func (c *K8sOrchestrator) getPVCAnnotations(ctx context.Context, volumeID string) (map[string]string, error) {
	log := logger.GetLogger(ctx)
	log.Debugf("Getting annotations on pvc corresponding to volume: %s", volumeID)
	if pvc := c.volumeIDToPvcMap.get(volumeID); pvc != "" {
		parts := strings.Split(pvc, "/")
		pvcNamespace := parts[0]
		pvcName := parts[1]

		pvcObj, err := c.informerManager.GetPVCLister().PersistentVolumeClaims(pvcNamespace).Get(pvcName)
		if err != nil {
			if apierrors.IsNotFound(err) {
				//PVC may have been deleted.
				log.Debugf("PVC %s is not found in namespace %s using informer manager", pvcName, pvcNamespace)
				return nil, common.ErrNotFound
			}
			log.Errorf("failed to get pvc: %s in namespace: %s. err=%v", pvcName, pvcNamespace, err)
			return nil, err
		}

		return pvcObj.Annotations, nil
	}

	log.Debugf("could not find pvc for volumeID: %s", volumeID)
	return nil, common.ErrNotFound
}

// updatePVCAnnotations updates annotations passed as key-value pairs
// on PVC bound to passed volumeID
func (c *K8sOrchestrator) updatePVCAnnotations(ctx context.Context, volumeID string, annotations map[string]string) error {
	log := logger.GetLogger(ctx)
	if pvc := c.volumeIDToPvcMap.get(volumeID); pvc != "" {
		parts := strings.Split(pvc, "/")
		pvcNamespace := parts[0]
		pvcName := parts[1]

		pvcObj, err := c.informerManager.GetPVCLister().PersistentVolumeClaims(pvcNamespace).Get(pvcName)
		if err != nil {
			if apierrors.IsNotFound(err) {
				//PVC may have been deleted. Return.
				log.Debugf("PVC %s is not found in namespace %s using informer manager", pvcName, pvcNamespace)
				return common.ErrNotFound
			}
			log.Errorf("failed to get pvc: %s in namespace: %s. err=%v", pvcName, pvcNamespace, err)
			return err
		}

		for key, val := range annotations {
			// If value is not set, remove the annotation
			if val == "" {
				delete(pvcObj.ObjectMeta.Annotations, key)
				log.Debugf("Removing annotation %s on pvc %s/%s", key, pvcNamespace, pvcName)
			} else {
				metav1.SetMetaDataAnnotation(&pvcObj.ObjectMeta, key, val)
				log.Debugf("Updating annotation %s on pvc %s/%s to value: %s", key, pvcNamespace, pvcName, val)
			}
		}
		_, err = c.k8sClient.CoreV1().PersistentVolumeClaims(pvcNamespace).Update(ctx, pvcObj, metav1.UpdateOptions{})
		if err != nil {
			log.Errorf("failed to update pvc annotations %s/%s with err:%+v", pvcNamespace, pvcName, err)
			return err
		}
		return nil
	}

	errMsg := fmt.Sprintf("could not find pvc for volumeID: %s", volumeID)
	log.Debugf(errMsg)
	return errors.New(errMsg)
}

// isFileVolume checks if the Persistent Volume has ReadWriteMany or ReadOnlyMany support
func isFileVolume(pv *v1.PersistentVolume) bool {
	if len(pv.Spec.AccessModes) == 0 {
		return false
	}
	for _, accessMode := range pv.Spec.AccessModes {
		if accessMode == v1.ReadWriteMany || accessMode == v1.ReadOnlyMany {
			return true
		}
	}
	return false
}
