// This file is part of MinIO Kubernetes Cloud
// Copyright (c) 2020 MinIO, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package restapi

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"net"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"k8s.io/apimachinery/pkg/api/resource"
	types "k8s.io/apimachinery/pkg/types"

	corev1 "k8s.io/api/core/v1"

	"github.com/minio/console/cluster"
	madmin "github.com/minio/minio/pkg/madmin"

	"github.com/go-openapi/runtime/middleware"
	"github.com/go-openapi/swag"
	"github.com/minio/console/models"
	"github.com/minio/console/restapi/operations"
	"github.com/minio/console/restapi/operations/admin_api"
	operator "github.com/minio/operator/pkg/apis/minio.min.io/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func registerTenantHandlers(api *operations.ConsoleAPI) {
	// Add Tenant
	api.AdminAPICreateTenantHandler = admin_api.CreateTenantHandlerFunc(func(params admin_api.CreateTenantParams, session *models.Principal) middleware.Responder {
		resp, err := getTenantCreatedResponse(session, params)
		if err != nil {
			return admin_api.NewCreateTenantDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String(err.Error())})
		}
		return admin_api.NewCreateTenantOK().WithPayload(resp)
	})
	// List All Tenants of all namespaces
	api.AdminAPIListAllTenantsHandler = admin_api.ListAllTenantsHandlerFunc(func(params admin_api.ListAllTenantsParams, session *models.Principal) middleware.Responder {
		resp, err := getListAllTenantsResponse(session, params)
		if err != nil {
			return admin_api.NewListTenantsDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String(err.Error())})
		}
		return admin_api.NewListTenantsOK().WithPayload(resp)

	})
	// List Tenants by namespace
	api.AdminAPIListTenantsHandler = admin_api.ListTenantsHandlerFunc(func(params admin_api.ListTenantsParams, session *models.Principal) middleware.Responder {
		resp, err := getListTenantsResponse(session, params)
		if err != nil {
			return admin_api.NewListTenantsDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String(err.Error())})
		}
		return admin_api.NewListTenantsOK().WithPayload(resp)

	})
	// Detail Tenant
	api.AdminAPITenantInfoHandler = admin_api.TenantInfoHandlerFunc(func(params admin_api.TenantInfoParams, session *models.Principal) middleware.Responder {
		resp, err := getTenantInfoResponse(session, params)
		if err != nil {
			return admin_api.NewTenantInfoDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String(err.Error())})
		}
		return admin_api.NewTenantInfoOK().WithPayload(resp)

	})

	// Delete Tenant
	api.AdminAPIDeleteTenantHandler = admin_api.DeleteTenantHandlerFunc(func(params admin_api.DeleteTenantParams, session *models.Principal) middleware.Responder {
		err := getDeleteTenantResponse(session, params)
		if err != nil {
			log.Println(err)
			return admin_api.NewTenantInfoDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String("Unable to delete tenant")})
		}
		return admin_api.NewTenantInfoOK()

	})

	// Update Tenant
	api.AdminAPIUpdateTenantHandler = admin_api.UpdateTenantHandlerFunc(func(params admin_api.UpdateTenantParams, session *models.Principal) middleware.Responder {
		err := getUpdateTenantResponse(session, params)
		if err != nil {
			log.Println(err)
			return admin_api.NewUpdateTenantDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String("Unable to update tenant")})
		}
		return admin_api.NewUpdateTenantCreated()
	})

	api.AdminAPITenantAddZoneHandler = admin_api.TenantAddZoneHandlerFunc(func(params admin_api.TenantAddZoneParams, session *models.Principal) middleware.Responder {
		err := getTenantAddZoneResponse(session, params)
		if err != nil {
			log.Println(err)
			return admin_api.NewTenantAddZoneDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String("Unable to update tenant")})
		}
		return admin_api.NewTenantAddZoneCreated()
	})

	api.AdminAPIGetTenantUsageHandler = admin_api.GetTenantUsageHandlerFunc(func(params admin_api.GetTenantUsageParams, session *models.Principal) middleware.Responder {
		payload, err := getTenantUsageResponse(session, params)
		if err != nil {
			log.Println(err)
			return admin_api.NewGetTenantUsageDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String("Unable to get tenant usage")})
		}
		return admin_api.NewGetTenantUsageOK().WithPayload(payload)
	})
}

// deleteTenantAction performs the actions of deleting a tenant
func deleteTenantAction(ctx context.Context, operatorClient OperatorClient, nameSpace, instanceName string) error {
	err := operatorClient.TenantDelete(ctx, nameSpace, instanceName, metav1.DeleteOptions{})
	if err != nil {
		return err
	}
	return nil
}

// getDeleteTenantResponse gets the output of deleting a minio instance
func getDeleteTenantResponse(session *models.Principal, params admin_api.DeleteTenantParams) error {
	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		return err
	}
	opClient := &operatorClient{
		client: opClientClientSet,
	}
	return deleteTenantAction(context.Background(), opClient, params.Namespace, params.Tenant)
}

func getTenantScheme(mi *operator.Tenant) string {
	scheme := "http"
	if mi.AutoCert() || mi.ExternalCert() {
		scheme = "https"
	}
	return scheme
}

func getTenantAdminClient(ctx context.Context, client K8sClient, namespace, tenantName, serviceName, scheme string) (*madmin.AdminClient, error) {
	// get admin credentials from secret
	creds, err := client.getSecret(ctx, namespace, fmt.Sprintf("%s-secret", tenantName), metav1.GetOptions{})
	if err != nil {
		return nil, err
	}
	accessKey, ok := creds.Data["accesskey"]
	if !ok {
		log.Println("tenant's secret doesn't contain accesskey")
		return nil, errorGeneric
	}
	secretkey, ok := creds.Data["secretkey"]
	if !ok {
		log.Println("tenant's secret doesn't contain secretkey")
		return nil, errorGeneric
	}
	service, err := client.getService(ctx, namespace, serviceName, metav1.GetOptions{})
	if err != nil {
		return nil, err
	}
	mAdmin, pErr := NewAdminClient(scheme+"://"+net.JoinHostPort(service.Spec.ClusterIP, strconv.Itoa(operator.MinIOPort)), string(accessKey), string(secretkey))
	if pErr != nil {
		return nil, pErr.Cause
	}
	return mAdmin, nil
}

func getTenant(ctx context.Context, operatorClient OperatorClient, namespace, tenantName string) (*operator.Tenant, error) {
	minInst, err := operatorClient.TenantGet(ctx, namespace, tenantName, metav1.GetOptions{})
	if err != nil {
		return nil, err
	}
	return minInst, nil
}

func getTenantInfo(tenant *operator.Tenant) *models.Tenant {
	var instanceCount int64
	var volumeCount int64
	for _, zone := range tenant.Spec.Zones {
		instanceCount = instanceCount + int64(zone.Servers)
		volumeCount = volumeCount + int64(zone.Servers*zone.VolumesPerServer)
	}

	var zones []*models.Zone

	var totalSize int64
	for _, z := range tenant.Spec.Zones {
		zoneModel := &models.Zone{
			Name:                z.Name,
			Servers:             swag.Int64(int64(z.Servers)),
			VolumesPerServer:    swag.Int32(z.VolumesPerServer),
			VolumeConfiguration: &models.ZoneVolumeConfiguration{},
		}

		if z.VolumeClaimTemplate != nil {
			zoneModel.VolumeConfiguration.Size = swag.Int64(z.VolumeClaimTemplate.Spec.Resources.Requests.Storage().Value())
			if z.VolumeClaimTemplate.Spec.StorageClassName != nil {
				zoneModel.VolumeConfiguration.StorageClassName = *z.VolumeClaimTemplate.Spec.StorageClassName
			}
		}

		zones = append(zones, zoneModel)
		zoneSize := int64(z.Servers) * int64(z.VolumesPerServer) * z.VolumeClaimTemplate.Spec.Resources.Requests.Storage().Value()
		totalSize = totalSize + zoneSize
	}

	return &models.Tenant{
		CreationDate: tenant.ObjectMeta.CreationTimestamp.String(),
		Name:         tenant.Name,
		TotalSize:    totalSize,
		CurrentState: tenant.Status.CurrentState,
		Zones:        zones,
		Namespace:    tenant.ObjectMeta.Namespace,
		Image:        tenant.Spec.Image,
	}
}

func getTenantInfoResponse(session *models.Principal, params admin_api.TenantInfoParams) (*models.Tenant, error) {
	// 5 seconds timeout
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		return nil, err
	}

	opClient := &operatorClient{
		client: opClientClientSet,
	}

	minTenant, err := getTenant(ctx, opClient, params.Namespace, params.Tenant)
	if err != nil {
		log.Println("error getting minioTenant:", err)
		return nil, err
	}

	info := getTenantInfo(minTenant)
	return info, nil
}

func listTenants(ctx context.Context, operatorClient OperatorClient, namespace string, limit *int32) (*models.ListTenantsResponse, error) {
	listOpts := metav1.ListOptions{
		Limit: 10,
	}

	if limit != nil {
		listOpts.Limit = int64(*limit)
	}

	minTenants, err := operatorClient.TenantList(ctx, namespace, listOpts)
	if err != nil {
		return nil, err
	}

	var tenants []*models.TenantList

	var totalSize int64

	for _, minInst := range minTenants.Items {

		var instanceCount int64
		var volumeCount int64
		for _, zone := range minInst.Spec.Zones {
			instanceCount = instanceCount + int64(zone.Servers)
			volumeCount = volumeCount + int64(zone.Servers*zone.VolumesPerServer)
			if zone.VolumeClaimTemplate != nil {
				zoneSize := int64(zone.VolumesPerServer) * int64(zone.Servers) * zone.VolumeClaimTemplate.Spec.Resources.Requests.Storage().Value()
				totalSize = totalSize + zoneSize
			}
		}

		tenants = append(tenants, &models.TenantList{
			CreationDate:  minInst.ObjectMeta.CreationTimestamp.String(),
			Name:          minInst.ObjectMeta.Name,
			ZoneCount:     int64(len(minInst.Spec.Zones)),
			InstanceCount: instanceCount,
			VolumeCount:   volumeCount,
			CurrentState:  minInst.Status.CurrentState,
			Namespace:     minInst.ObjectMeta.Namespace,
			TotalSize:     totalSize,
		})
	}

	return &models.ListTenantsResponse{
		Tenants: tenants,
		Total:   0,
	}, nil
}

func getListAllTenantsResponse(session *models.Principal, params admin_api.ListAllTenantsParams) (*models.ListTenantsResponse, error) {
	ctx := context.Background()
	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		log.Println("error getting operator client:", err)
		return nil, err
	}
	opClient := &operatorClient{
		client: opClientClientSet,
	}
	listT, err := listTenants(ctx, opClient, "", params.Limit)
	if err != nil {
		log.Println("error listing tenants:", err)
		return nil, err
	}
	return listT, nil
}

// getListTenantsResponse list tenants by namespace
func getListTenantsResponse(session *models.Principal, params admin_api.ListTenantsParams) (*models.ListTenantsResponse, error) {
	ctx := context.Background()
	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		log.Println("error getting operator client:", err)
		return nil, err
	}
	opClient := &operatorClient{
		client: opClientClientSet,
	}
	listT, err := listTenants(ctx, opClient, params.Namespace, params.Limit)
	if err != nil {
		log.Println("error listing tenants:", err)
		return nil, err
	}
	return listT, nil
}

func getTenantCreatedResponse(session *models.Principal, params admin_api.CreateTenantParams) (*models.CreateTenantResponse, error) {
	minioImage := params.Body.Image
	if minioImage == "" {
		minImg, err := cluster.GetMinioImage()
		if err != nil {
			return nil, err
		}
		minioImage = *minImg
	}

	// if access/secret are provided, use them, else create a random pair
	accessKey := RandomCharString(16)
	secretKey := RandomCharString(32)
	if params.Body.AccessKey != "" {
		accessKey = params.Body.AccessKey
	}
	if params.Body.SecretKey != "" {
		secretKey = params.Body.SecretKey
	}
	secretName := fmt.Sprintf("%s-secret", *params.Body.Name)
	imm := true
	instanceSecret := corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name: secretName,
		},
		Immutable: &imm,
		Data: map[string][]byte{
			"accesskey": []byte(accessKey),
			"secretkey": []byte(secretKey),
		},
	}

	clientset, err := cluster.K8sClient(session.SessionToken)
	if err != nil {
		return nil, err
	}
	ns := *params.Body.Namespace
	_, err = clientset.CoreV1().Secrets(ns).Create(context.Background(), &instanceSecret, metav1.CreateOptions{})
	if err != nil {
		return nil, err
	}

	enableSSL := false
	if params.Body.EnableSsl != nil {
		enableSSL = *params.Body.EnableSsl
	}
	enableConsole := true
	if params.Body.EnableConsole != nil {
		enableConsole = *params.Body.EnableConsole
	}

	// TODO: Calculate this ourselves?
	memorySize, err := resource.ParseQuantity(getTenantMemorySize())
	if err != nil {
		return nil, err
	}

	//Construct a MinIO Instance with everything we are getting from parameters
	minInst := operator.Tenant{
		ObjectMeta: metav1.ObjectMeta{
			Name: *params.Body.Name,
		},
		Spec: operator.TenantSpec{
			Image:     minioImage,
			Mountpath: "/export",
			CredsSecret: &corev1.LocalObjectReference{
				Name: secretName,
			},
			RequestAutoCert: enableSSL,
		},
	}
	// optionals are set below

	if enableConsole {
		consoleSelector := fmt.Sprintf("%s-console", *params.Body.Name)

		consoleSecretName := fmt.Sprintf("%s-secret", consoleSelector)
		imm := true
		instanceSecret := corev1.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Name: consoleSecretName,
			},
			Immutable: &imm,
			Data: map[string][]byte{
				"CONSOLE_HMAC_JWT_SECRET":  []byte(RandomCharString(16)),
				"CONSOLE_PBKDF_PASSPHRASE": []byte(RandomCharString(16)),
				"CONSOLE_PBKDF_SALT":       []byte(RandomCharString(8)),
				"CONSOLE_ACCESS_KEY":       []byte(RandomCharString(16)),
				"CONSOLE_SECRET_KEY":       []byte(RandomCharString(32)),
			},
		}
		_, err = clientset.CoreV1().Secrets(ns).Create(context.Background(), &instanceSecret, metav1.CreateOptions{})
		if err != nil {
			return nil, err
		}

		const consoleVersion = "minio/console:v0.3.0"
		minInst.Spec.Console = &operator.ConsoleConfiguration{
			Replicas:      2,
			Image:         consoleVersion,
			ConsoleSecret: &corev1.LocalObjectReference{Name: consoleSecretName},
		}
	}

	// set the service name if provided
	if params.Body.ServiceName != "" {
		minInst.Spec.ServiceName = params.Body.ServiceName
	}
	// set the zones if they are provided
	if len(params.Body.Zones) > 0 {
		for _, zone := range params.Body.Zones {
			volumeSize := resource.NewQuantity(*zone.VolumeConfiguration.Size, resource.DecimalExponent)
			volTemp := corev1.PersistentVolumeClaimSpec{
				AccessModes: []corev1.PersistentVolumeAccessMode{
					corev1.ReadWriteOnce,
				},
				Resources: corev1.ResourceRequirements{
					Requests: corev1.ResourceList{
						corev1.ResourceStorage: *volumeSize,
					},
				},
			}
			if zone.VolumeConfiguration.StorageClassName != "" {
				volTemp.StorageClassName = &zone.VolumeConfiguration.StorageClassName
			}
			minInst.Spec.Zones = append(minInst.Spec.Zones, operator.Zone{
				Name:             zone.Name,
				Servers:          int32(*zone.Servers),
				VolumesPerServer: *zone.VolumesPerServer,
				VolumeClaimTemplate: &corev1.PersistentVolumeClaim{
					ObjectMeta: metav1.ObjectMeta{
						Name: "data",
					},
					Spec: volTemp,
				},
				Resources: corev1.ResourceRequirements{
					Requests: corev1.ResourceList{
						corev1.ResourceMemory: memorySize,
					},
				},
			})
		}
	}

	// Set Mount Path if provided
	if params.Body.MounthPath != "" {
		minInst.Spec.Mountpath = params.Body.MounthPath
	}
	// add annotations
	if len(params.Body.Annotations) > 0 {
		if minInst.Spec.Metadata == nil {
			minInst.Spec.Metadata = &metav1.ObjectMeta{}
		}
		minInst.Spec.Metadata.Annotations = params.Body.Annotations
	}

	opClient, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		return nil, err
	}

	_, err = opClient.MinioV1().Tenants(ns).Create(context.Background(), &minInst, metav1.CreateOptions{})
	if err != nil {
		return nil, err
	}

	// Integratrions
	if os.Getenv("GKE_INTEGRATION") != "" {
		err := gkeIntegration(clientset, *params.Body.Name, ns, session.SessionToken)
		if err != nil {
			return nil, err
		}
	}

	return &models.CreateTenantResponse{
		AccessKey: accessKey,
		SecretKey: secretKey,
	}, nil
}

// updateTenantAction does an update on the minioTenant by patching the desired changes
func updateTenantAction(ctx context.Context, operatorClient OperatorClient, httpCl cluster.HTTPClientI, nameSpace string, params admin_api.UpdateTenantParams) error {
	imageToUpdate := params.Body.Image
	minInst, err := operatorClient.TenantGet(ctx, nameSpace, params.Tenant, metav1.GetOptions{})
	if err != nil {
		return err
	}

	// if image to update is empty we'll use the latest image by default
	if strings.TrimSpace(imageToUpdate) != "" {
		minInst.Spec.Image = params.Body.Image
	} else {
		im, err := cluster.GetLatestMinioImage(httpCl)
		if err != nil {
			return err
		}
		minInst.Spec.Image = *im
	}

	payloadBytes, err := json.Marshal(minInst)
	if err != nil {
		return err
	}
	_, err = operatorClient.TenantPatch(ctx, nameSpace, minInst.Name, types.MergePatchType, payloadBytes, metav1.PatchOptions{})
	if err != nil {
		return err
	}
	return nil
}

func getUpdateTenantResponse(session *models.Principal, params admin_api.UpdateTenantParams) error {
	ctx := context.Background()
	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		log.Println("error getting operator client:", err)
		return err
	}

	opClient := &operatorClient{
		client: opClientClientSet,
	}
	httpC := &cluster.HTTPClient{
		Client: &http.Client{
			Timeout: 4 * time.Second,
		},
	}
	if err := updateTenantAction(ctx, opClient, httpC, params.Namespace, params); err != nil {
		log.Println("error patching Tenant:", err)
		return err
	}
	return nil
}

// addTenantZone creates a zone to a defined tenant
func addTenantZone(ctx context.Context, operatorClient OperatorClient, params admin_api.TenantAddZoneParams) error {
	minInst, err := operatorClient.TenantGet(ctx, params.Namespace, params.Tenant, metav1.GetOptions{})
	if err != nil {
		return err
	}

	zoneParams := params.Body
	if zoneParams.VolumeConfiguration == nil {
		return errors.New("a volume configuration must be specified")
	}

	if zoneParams.VolumeConfiguration.Size == nil || *zoneParams.VolumeConfiguration.Size <= int64(0) {
		return errors.New("volume size must be greater than 0")
	}

	if zoneParams.Servers == nil || *zoneParams.Servers <= 0 {
		return errors.New("number of servers must be greater than 0")
	}

	if zoneParams.VolumesPerServer == nil || *zoneParams.VolumesPerServer <= 0 {
		return errors.New("number of volumes per server must be greater than 0")
	}

	volumeSize := resource.NewQuantity(*zoneParams.VolumeConfiguration.Size, resource.DecimalExponent)
	volTemp := corev1.PersistentVolumeClaimSpec{
		AccessModes: []corev1.PersistentVolumeAccessMode{
			corev1.ReadWriteOnce,
		},
		Resources: corev1.ResourceRequirements{
			Requests: corev1.ResourceList{
				corev1.ResourceStorage: *volumeSize,
			},
		},
	}
	if zoneParams.VolumeConfiguration.StorageClassName != "" {
		volTemp.StorageClassName = &zoneParams.VolumeConfiguration.StorageClassName
	}

	// TODO: Calculate this ourselves?
	memorySize, err := resource.ParseQuantity(getTenantMemorySize())
	if err != nil {
		return err
	}

	minInst.Spec.Zones = append(minInst.Spec.Zones, operator.Zone{
		Name:             zoneParams.Name,
		Servers:          int32(*zoneParams.Servers),
		VolumesPerServer: *zoneParams.VolumesPerServer,
		VolumeClaimTemplate: &corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{
				Name: "data",
			},
			Spec: volTemp,
		},
		Resources: corev1.ResourceRequirements{
			Requests: corev1.ResourceList{
				corev1.ResourceMemory: memorySize,
			},
		},
	})

	payloadBytes, err := json.Marshal(minInst)
	if err != nil {
		return err
	}

	_, err = operatorClient.TenantPatch(ctx, params.Namespace, minInst.Name, types.MergePatchType, payloadBytes, metav1.PatchOptions{})
	if err != nil {
		return err
	}
	return nil
}

func getTenantAddZoneResponse(session *models.Principal, params admin_api.TenantAddZoneParams) error {
	ctx := context.Background()
	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		log.Println("error getting operator client:", err)
		return err
	}
	opClient := &operatorClient{
		client: opClientClientSet,
	}
	if err := addTenantZone(ctx, opClient, params); err != nil {
		log.Println("error patching Tenant:", err)
		return err
	}
	return nil
}

// getTenantUsageResponse returns the usage of a tenant
func getTenantUsageResponse(session *models.Principal, params admin_api.GetTenantUsageParams) (*models.TenantUsage, error) {
	// 5 seconds timeout
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	opClientClientSet, err := cluster.OperatorClient(session.SessionToken)
	if err != nil {
		return nil, err
	}
	clientset, err := cluster.K8sClient(session.SessionToken)
	if err != nil {
		log.Println("error getting k8sClient:", err)
		return nil, err
	}

	opClient := &operatorClient{
		client: opClientClientSet,
	}
	k8sClient := &k8sClient{
		client: clientset,
	}

	minTenant, err := getTenant(ctx, opClient, params.Namespace, params.Tenant)
	if err != nil {
		log.Println("error getting minioTenant:", err)
		return nil, err
	}
	tenantScheme := getTenantScheme(minTenant)

	svcName := minTenant.Spec.ServiceName
	if svcName == "" {
		svcName = minTenant.Name
		// TODO:
		// 1 get tenant services
		// 2 filter out cluster ip svc
	}

	mAdmin, err := getTenantAdminClient(
		ctx,
		k8sClient,
		params.Namespace,
		params.Tenant,
		svcName,
		tenantScheme)
	if err != nil {
		log.Println("error getting tenant's admin client:", err)
		return nil, err
	}
	// create a minioClient interface implementation
	// defining the client to be used
	adminClient := adminClient{client: mAdmin}
	// serialize output
	adminInfo, err := getAdminInfo(ctx, adminClient)
	if err != nil {
		log.Println("error getting admin info:", err)
		return nil, err
	}
	info := &models.TenantUsage{UsedSize: adminInfo.Usage}
	return info, nil
}