You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: delete_cluster.go
    path of file: ./repos/pipeline/internal/providers/vsphere/pke/workflow
    
    the code of the file until where you have to start completion: // Copyright Â© 2019 Banzai Cloud
//
// 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 workflow

import (
	"fmt"
	"time"

	"emperror.dev/errors"
	"go.uber.org/cadence"
	"go.uber.org/cadence/workflow"

	intClusterWorkflow "github.com/banzaicloud/pipeline/internal/cluster/workflow"
	"github.com/banzaicloud/pipeline/internal/providers/pke/pkeworkflow"
	pkgCadence "github.com/banzaicloud/pipeline/pkg/cadence"
	pkgCluster "github.com/banzaicloud/pipeline/pkg/cluster"
)

const DeleteClusterWorkflowName = "pke-vsphere-delete-cluster"

// DeleteClusterWorkflowInput
type DeleteClusterWorkflowInput struct {
	ClusterID        uint
	ClusterName      string
	ClusterUID       string
	K8sSecretID      string
	OrganizationID   uint
	OrganizationName string
	ResourcePoolName string
	FolderName       string
	DatastoreName    string
	SecretID         string
	MasterNodes      []Node
	Nodes            []Node
	Forced           bool
}

func DeleteClusterWorkflow(ctx workflow.Context, input DeleteClusterWorkflowInput) error {
	logger := workflow.GetLogger(ctx).Sugar()

	ao := workflow.ActivityOptions{
		ScheduleToStartTimeout: 5 * time.Minute,
		StartToCloseTimeout:    10 * time.Minute,
		ScheduleToCloseTimeout: 15 * time.Minute,
		WaitForCancellation:    true,
		RetryPolicy: &cadence.RetryPolicy{
			InitialInterval:          2 * time.Second,
			BackoffCoefficient:       1.5,
			Ma
    
func DeleteClusterWorkflow(ctx workflow.Context, input DeleteClusterWorkflowInput) error {
	logger := workflow.GetLogger(ctx).Sugar()

	ao := workflow.ActivityOptions{
		ScheduleToStartTimeout: 5 * time.Minute,
		StartToCloseTimeout:    10 * time.Minute,
		ScheduleToCloseTimeout: 15 * time.Minute,
		WaitForCancellation:    true,
		RetryPolicy: &cadence.RetryPolicy{
			InitialInterval:          2 * time.Second,
			BackoffCoefficient:       1.5,
			MaximumInterval:          30 * time.Second,
			MaximumAttempts:          5,
			NonRetriableErrorReasons: []string{"cadenceInternal:Panic"},
		},
	}

	ctx = workflow.WithActivityOptions(ctx, ao)

	// delete k8s resources
	if input.K8sSecretID != "" {
		wfInput := intClusterWorkflow.DeleteK8sResourcesWorkflowInput{
			OrganizationID: input.OrganizationID,
			ClusterName:    input.ClusterName,
			K8sSecretID:    input.K8sSecretID,
		}
		if err := workflow.ExecuteChildWorkflow(ctx, intClusterWorkflow.DeleteK8sResourcesWorkflowName, wfInput).Get(ctx, nil); err != nil {
			if input.Forced {
				logger.Errorw("deleting k8s resources failed", "error", err)
			} else {
				_ = setClusterErrorStatus(ctx, input.ClusterID, err)
				return err
			}
		}
	}

	// Delete VM nodes
	{
		for _, node := range input.Nodes {
			activityInput := DeleteNodeActivityInput{
				OrganizationID: input.OrganizationID,
				SecretID:       input.SecretID,
				ClusterID:      input.ClusterID,
				ClusterName:    input.ClusterName,
				Node:           node,
			}

			err := workflow.ExecuteActivity(ctx, DeleteNodeActivityName, activityInput).Get(ctx, nil)
			if err != nil {
				if input.Forced {
					logger.Errorw("delete node failed", "error", err, "node", node.Name)
				} else {
					e := errors.WrapIff(err, "deleting node %q", node.Name)
					_ = setClusterErrorStatus(ctx, input.ClusterID, e)
					return e
				}
			}
		}
	}

	// Delete master VM nodes
	{
		futures := make(map[string]workflow.Future)

		for _, node := range input.MasterNodes {
			activityInput := DeleteNodeActivityInput{
				OrganizationID: input.OrganizationID,
				SecretID:       input.SecretID,
				ClusterID:      input.ClusterID,
				ClusterName:    input.ClusterName,
				Node:           node,
			}
			futures[node.Name] = workflow.ExecuteActivity(ctx, DeleteNodeActivityName, activityInput)
		}

		errs := []error{}

		for i := range futures {
			var existed bool
			errs = append(errs, errors.WrapIff(futures[i].Get(ctx, &existed), "deleting node %q", i))
		}

		if err := errors.Combine(errs...); err != nil {
			if input.Forced {
				logger.Errorw("delete master node failed", "error", err)
			} else {
				_ = setClusterErrorStatus(ctx, input.ClusterID, err)
				return err
			}
		}
	}

	// delete unused secrets
	{
		activityInput := intClusterWorkflow.DeleteUnusedClusterSecretsActivityInput{
			OrganizationID: input.OrganizationID,
			ClusterUID:     input.ClusterUID,
		}
		if err := workflow.ExecuteActivity(ctx, intClusterWorkflow.DeleteUnusedClusterSecretsActivityName, activityInput).Get(ctx, nil); err != nil {
			_ = setClusterStatus(ctx, input.ClusterID, pkgCluster.Warning, fmt.Sprintf("failed to delete unused cluster secrets: %v", pkgCadence.UnwrapError(err)))
		}
	}

	// remove dex client (if we created it)
	{
		deleteDexClientActivityInput := &pkeworkflow.DeleteDexClientActivityInput{
			ClusterID: input.ClusterID,
		}
		if err := workflow.ExecuteActivity(ctx, pkeworkflow.DeleteDexClientActivityName, deleteDexClientActivityInput).Get(ctx, nil); err != nil {
			if input.Forced {
				logger.Errorw("delete dex client failed", "error", err)
			} else {
				_ = setClusterErrorStatus(ctx, input.ClusterID, err)
				return err
			}
		}
	}

	// delete cluster from data store
	{
		activityInput := DeleteClusterFromStoreActivityInput{
			ClusterID: input.ClusterID,
		}
		err := workflow.ExecuteActivity(ctx, DeleteClusterFromStoreActivityName, activityInput).Get(ctx, nil)
		if err != nil {
			if input.Forced {
				logger.Errorw("delete cluster from data store", "error", err)
			} else {
				_ = setClusterErrorStatus(ctx, input.ClusterID, err)
				return err
			}
		}
	}

	return nil
}