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_ca.go
    path of file: ./repos/golang-samples/privateca
    
    the code of the file until where you have to start completion: // Copyright 2023 Google LLC
//
// 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
//
//     https://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 snippets

// [START privateca_delete_ca]
import (
	"context"
	"fmt"
	"io"

	privateca "cloud.google.com/go/security/privateca/apiv1"
	"cloud.google.com/go/security/privateca/apiv1/privatecapb"
)

// Delete a Certificate Authority from the specified CA pool.
// Before deletion, the CA must be disabled or staged and must not contain any active certificates.
func deleteCa(w io.Writer, projectId string, location string, caPoolId string, caId string) error {
	// projectId := "your_project_id"
	// location := "us-central1"	// For a list of locations, see: https://cloud.google.com/certificate-authority-service/docs/locations.
	// caPoolId := "ca-pool-id"		// The id of the CA pool under which the CA is present.
	// caId := "ca-id"				// The id of the CA to be deleted.

	ctx := context.Background()
	caClient, err := privateca.NewCertificateAuthorityClient(ctx)
	if err != nil {
		return fmt.Errorf("NewCertificateAuthorityClient creation failed: %w", err)
	}
	defer caClient.Close()

	fullCaName := fmt.Sprintf("projects/%s/locations/%s/caPools/%s/certificateAuthorities/%s",
		projectId, location, caPoolId, caId)

	// Check if the CA is disabled or staged.
	// See https://pkg.go.dev/cloud.google.com/go/security/privateca/apiv1/privatecapb#GetCertificateAuthorityRequest.
	caReq := &privatecapb.GetCertificateAuthorityRequest{Name: fullCaName}
	caResp, err := caClient.GetCertificateAuthority(ctx, caReq)
	if err != nil {
		return fmt.Errorf("GetCertificateAuthori
    
func deleteCa(w io.Writer, projectId string, location string, caPoolId string, caId string) error {
	// projectId := "your_project_id"
	// location := "us-central1"	// For a list of locations, see: https://cloud.google.com/certificate-authority-service/docs/locations.
	// caPoolId := "ca-pool-id"		// The id of the CA pool under which the CA is present.
	// caId := "ca-id"				// The id of the CA to be deleted.

	ctx := context.Background()
	caClient, err := privateca.NewCertificateAuthorityClient(ctx)
	if err != nil {
		return fmt.Errorf("NewCertificateAuthorityClient creation failed: %w", err)
	}
	defer caClient.Close()

	fullCaName := fmt.Sprintf("projects/%s/locations/%s/caPools/%s/certificateAuthorities/%s",
		projectId, location, caPoolId, caId)

	// Check if the CA is disabled or staged.
	// See https://pkg.go.dev/cloud.google.com/go/security/privateca/apiv1/privatecapb#GetCertificateAuthorityRequest.
	caReq := &privatecapb.GetCertificateAuthorityRequest{Name: fullCaName}
	caResp, err := caClient.GetCertificateAuthority(ctx, caReq)
	if err != nil {
		return fmt.Errorf("GetCertificateAuthority failed: %w", err)
	}

	if caResp.State != privatecapb.CertificateAuthority_DISABLED &&
		caResp.State != privatecapb.CertificateAuthority_STAGED {
		return fmt.Errorf("you can only delete disabled or staged Certificate Authorities. %s is not disabled", caId)
	}

	// Create the DeleteCertificateAuthorityRequest.
	// Setting the IgnoreActiveCertificates to True will delete the CA
	// even if it contains active certificates. Care should be taken to re-anchor
	// the certificates to new CA before deleting.
	// See https://pkg.go.dev/cloud.google.com/go/security/privateca/apiv1/privatecapb#DeleteCertificateAuthorityRequest.
	req := &privatecapb.DeleteCertificateAuthorityRequest{
		Name:                     fullCaName,
		IgnoreActiveCertificates: false,
	}

	op, err := caClient.DeleteCertificateAuthority(ctx, req)
	if err != nil {
		return fmt.Errorf("DeleteCertificateAuthority failed: %w", err)
	}

	if caResp, err = op.Wait(ctx); err != nil {
		return fmt.Errorf("DeleteCertificateAuthority failed during wait: %w", err)
	}

	if caResp.State != privatecapb.CertificateAuthority_DELETED {
		return fmt.Errorf("unable to delete Certificate Authority. Current state: %s", caResp.State.String())
	}

	fmt.Fprintf(w, "Successfully deleted Certificate Authority: %s.", caId)
	return nil
}