package compute

// Copyright (c) Microsoft and contributors.  All rights reserved.
//
// 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.
//
// Code generated by Microsoft (R) AutoRest Code Generator.
// Changes may cause incorrect behavior and will be lost if the code is regenerated.

import (
	"context"
	"github.com/Azure/go-autorest/autorest"
	"github.com/Azure/go-autorest/autorest/azure"
	"github.com/Azure/go-autorest/autorest/validation"
	"github.com/Azure/go-autorest/tracing"
	"net/http"
)

// SnapshotsClient is the compute Client
type SnapshotsClient struct {
	BaseClient
}

// NewSnapshotsClient creates an instance of the SnapshotsClient client.
func NewSnapshotsClient(subscriptionID string) SnapshotsClient {
	return NewSnapshotsClientWithBaseURI(DefaultBaseURI, subscriptionID)
}

// NewSnapshotsClientWithBaseURI creates an instance of the SnapshotsClient client using a custom endpoint.  Use this
// when interacting with an Azure cloud that uses a non-standard base URI (sovereign clouds, Azure stack).
func NewSnapshotsClientWithBaseURI(baseURI string, subscriptionID string) SnapshotsClient {
	return SnapshotsClient{NewWithBaseURI(baseURI, subscriptionID)}
}

// CreateOrUpdate creates or updates a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
// snapshot - snapshot object supplied in the body of the Put disk operation.
func (client SnapshotsClient) CreateOrUpdate(ctx context.Context, resourceGroupName string, snapshotName string, snapshot Snapshot) (result SnapshotsCreateOrUpdateFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.CreateOrUpdate")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: snapshot,
			Constraints: []validation.Constraint{{Target: "snapshot.DiskProperties", Name: validation.Null, Rule: false,
				Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.CreationData", Name: validation.Null, Rule: true,
					Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.CreationData.ImageReference", Name: validation.Null, Rule: false,
						Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.CreationData.ImageReference.ID", Name: validation.Null, Rule: true, Chain: nil}}},
					}},
					{Target: "snapshot.DiskProperties.EncryptionSettings", Name: validation.Null, Rule: false,
						Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.EncryptionSettings.DiskEncryptionKey", Name: validation.Null, Rule: false,
							Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.EncryptionSettings.DiskEncryptionKey.SourceVault", Name: validation.Null, Rule: true, Chain: nil},
								{Target: "snapshot.DiskProperties.EncryptionSettings.DiskEncryptionKey.SecretURL", Name: validation.Null, Rule: true, Chain: nil},
							}},
							{Target: "snapshot.DiskProperties.EncryptionSettings.KeyEncryptionKey", Name: validation.Null, Rule: false,
								Chain: []validation.Constraint{{Target: "snapshot.DiskProperties.EncryptionSettings.KeyEncryptionKey.SourceVault", Name: validation.Null, Rule: true, Chain: nil},
									{Target: "snapshot.DiskProperties.EncryptionSettings.KeyEncryptionKey.KeyURL", Name: validation.Null, Rule: true, Chain: nil},
								}},
						}},
				}}}}}); err != nil {
		return result, validation.NewError("compute.SnapshotsClient", "CreateOrUpdate", err.Error())
	}

	req, err := client.CreateOrUpdatePreparer(ctx, resourceGroupName, snapshotName, snapshot)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "CreateOrUpdate", nil, "Failure preparing request")
		return
	}

	result, err = client.CreateOrUpdateSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "CreateOrUpdate", nil, "Failure sending request")
		return
	}

	return
}

// CreateOrUpdatePreparer prepares the CreateOrUpdate request.
func (client SnapshotsClient) CreateOrUpdatePreparer(ctx context.Context, resourceGroupName string, snapshotName string, snapshot Snapshot) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPut(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}", pathParameters),
		autorest.WithJSON(snapshot),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// CreateOrUpdateSender sends the CreateOrUpdate request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) CreateOrUpdateSender(req *http.Request) (future SnapshotsCreateOrUpdateFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = func(client SnapshotsClient) (s Snapshot, err error) {
		var done bool
		done, err = future.DoneWithContext(context.Background(), client)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsCreateOrUpdateFuture", "Result", future.Response(), "Polling failure")
			return
		}
		if !done {
			err = azure.NewAsyncOpIncompleteError("compute.SnapshotsCreateOrUpdateFuture")
			return
		}
		sender := autorest.DecorateSender(client, autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...))
		s.Response.Response, err = future.GetResult(sender)
		if s.Response.Response == nil && err == nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsCreateOrUpdateFuture", "Result", nil, "received nil response and error")
		}
		if err == nil && s.Response.Response.StatusCode != http.StatusNoContent {
			s, err = client.CreateOrUpdateResponder(s.Response.Response)
			if err != nil {
				err = autorest.NewErrorWithError(err, "compute.SnapshotsCreateOrUpdateFuture", "Result", s.Response.Response, "Failure responding to request")
			}
		}
		return
	}
	return
}

// CreateOrUpdateResponder handles the response to the CreateOrUpdate request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) CreateOrUpdateResponder(resp *http.Response) (result Snapshot, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Delete deletes a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
func (client SnapshotsClient) Delete(ctx context.Context, resourceGroupName string, snapshotName string) (result SnapshotsDeleteFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.Delete")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.DeletePreparer(ctx, resourceGroupName, snapshotName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Delete", nil, "Failure preparing request")
		return
	}

	result, err = client.DeleteSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Delete", nil, "Failure sending request")
		return
	}

	return
}

// DeletePreparer prepares the Delete request.
func (client SnapshotsClient) DeletePreparer(ctx context.Context, resourceGroupName string, snapshotName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsDelete(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// DeleteSender sends the Delete request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) DeleteSender(req *http.Request) (future SnapshotsDeleteFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = func(client SnapshotsClient) (osr OperationStatusResponse, err error) {
		var done bool
		done, err = future.DoneWithContext(context.Background(), client)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsDeleteFuture", "Result", future.Response(), "Polling failure")
			return
		}
		if !done {
			err = azure.NewAsyncOpIncompleteError("compute.SnapshotsDeleteFuture")
			return
		}
		sender := autorest.DecorateSender(client, autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...))
		osr.Response.Response, err = future.GetResult(sender)
		if osr.Response.Response == nil && err == nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsDeleteFuture", "Result", nil, "received nil response and error")
		}
		if err == nil && osr.Response.Response.StatusCode != http.StatusNoContent {
			osr, err = client.DeleteResponder(osr.Response.Response)
			if err != nil {
				err = autorest.NewErrorWithError(err, "compute.SnapshotsDeleteFuture", "Result", osr.Response.Response, "Failure responding to request")
			}
		}
		return
	}
	return
}

// DeleteResponder handles the response to the Delete request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) DeleteResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted, http.StatusNoContent),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Get gets information about a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
func (client SnapshotsClient) Get(ctx context.Context, resourceGroupName string, snapshotName string) (result Snapshot, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.Get")
		defer func() {
			sc := -1
			if result.Response.Response != nil {
				sc = result.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.GetPreparer(ctx, resourceGroupName, snapshotName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Get", nil, "Failure preparing request")
		return
	}

	resp, err := client.GetSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Get", resp, "Failure sending request")
		return
	}

	result, err = client.GetResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Get", resp, "Failure responding to request")
		return
	}

	return
}

// GetPreparer prepares the Get request.
func (client SnapshotsClient) GetPreparer(ctx context.Context, resourceGroupName string, snapshotName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// GetSender sends the Get request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) GetSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

// GetResponder handles the response to the Get request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) GetResponder(resp *http.Response) (result Snapshot, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// GrantAccess grants access to a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
// grantAccessData - access data object supplied in the body of the get snapshot access operation.
func (client SnapshotsClient) GrantAccess(ctx context.Context, resourceGroupName string, snapshotName string, grantAccessData GrantAccessData) (result SnapshotsGrantAccessFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.GrantAccess")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	if err := validation.Validate([]validation.Validation{
		{TargetValue: grantAccessData,
			Constraints: []validation.Constraint{{Target: "grantAccessData.DurationInSeconds", Name: validation.Null, Rule: true, Chain: nil}}}}); err != nil {
		return result, validation.NewError("compute.SnapshotsClient", "GrantAccess", err.Error())
	}

	req, err := client.GrantAccessPreparer(ctx, resourceGroupName, snapshotName, grantAccessData)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "GrantAccess", nil, "Failure preparing request")
		return
	}

	result, err = client.GrantAccessSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "GrantAccess", nil, "Failure sending request")
		return
	}

	return
}

// GrantAccessPreparer prepares the GrantAccess request.
func (client SnapshotsClient) GrantAccessPreparer(ctx context.Context, resourceGroupName string, snapshotName string, grantAccessData GrantAccessData) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}/beginGetAccess", pathParameters),
		autorest.WithJSON(grantAccessData),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// GrantAccessSender sends the GrantAccess request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) GrantAccessSender(req *http.Request) (future SnapshotsGrantAccessFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = func(client SnapshotsClient) (au AccessURI, err error) {
		var done bool
		done, err = future.DoneWithContext(context.Background(), client)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsGrantAccessFuture", "Result", future.Response(), "Polling failure")
			return
		}
		if !done {
			err = azure.NewAsyncOpIncompleteError("compute.SnapshotsGrantAccessFuture")
			return
		}
		sender := autorest.DecorateSender(client, autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...))
		au.Response.Response, err = future.GetResult(sender)
		if au.Response.Response == nil && err == nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsGrantAccessFuture", "Result", nil, "received nil response and error")
		}
		if err == nil && au.Response.Response.StatusCode != http.StatusNoContent {
			au, err = client.GrantAccessResponder(au.Response.Response)
			if err != nil {
				err = autorest.NewErrorWithError(err, "compute.SnapshotsGrantAccessFuture", "Result", au.Response.Response, "Failure responding to request")
			}
		}
		return
	}
	return
}

// GrantAccessResponder handles the response to the GrantAccess request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) GrantAccessResponder(resp *http.Response) (result AccessURI, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// List lists snapshots under a subscription.
func (client SnapshotsClient) List(ctx context.Context) (result SnapshotListPage, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.List")
		defer func() {
			sc := -1
			if result.sl.Response.Response != nil {
				sc = result.sl.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.fn = client.listNextResults
	req, err := client.ListPreparer(ctx)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "List", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListSender(req)
	if err != nil {
		result.sl.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "List", resp, "Failure sending request")
		return
	}

	result.sl, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "List", resp, "Failure responding to request")
		return
	}
	if result.sl.hasNextLink() && result.sl.IsEmpty() {
		err = result.NextWithContext(ctx)
		return
	}

	return
}

// ListPreparer prepares the List request.
func (client SnapshotsClient) ListPreparer(ctx context.Context) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"subscriptionId": autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/Microsoft.Compute/snapshots", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// ListSender sends the List request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) ListSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

// ListResponder handles the response to the List request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) ListResponder(resp *http.Response) (result SnapshotList, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// listNextResults retrieves the next set of results, if any.
func (client SnapshotsClient) listNextResults(ctx context.Context, lastResults SnapshotList) (result SnapshotList, err error) {
	req, err := lastResults.snapshotListPreparer(ctx)
	if err != nil {
		return result, autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listNextResults", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}
	resp, err := client.ListSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listNextResults", resp, "Failure sending next results request")
	}
	result, err = client.ListResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listNextResults", resp, "Failure responding to next results request")
	}
	return
}

// ListComplete enumerates all values, automatically crossing page boundaries as required.
func (client SnapshotsClient) ListComplete(ctx context.Context) (result SnapshotListIterator, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.List")
		defer func() {
			sc := -1
			if result.Response().Response.Response != nil {
				sc = result.page.Response().Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.page, err = client.List(ctx)
	return
}

// ListByResourceGroup lists snapshots under a resource group.
// Parameters:
// resourceGroupName - the name of the resource group.
func (client SnapshotsClient) ListByResourceGroup(ctx context.Context, resourceGroupName string) (result SnapshotListPage, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.ListByResourceGroup")
		defer func() {
			sc := -1
			if result.sl.Response.Response != nil {
				sc = result.sl.Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.fn = client.listByResourceGroupNextResults
	req, err := client.ListByResourceGroupPreparer(ctx, resourceGroupName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "ListByResourceGroup", nil, "Failure preparing request")
		return
	}

	resp, err := client.ListByResourceGroupSender(req)
	if err != nil {
		result.sl.Response = autorest.Response{Response: resp}
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "ListByResourceGroup", resp, "Failure sending request")
		return
	}

	result.sl, err = client.ListByResourceGroupResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "ListByResourceGroup", resp, "Failure responding to request")
		return
	}
	if result.sl.hasNextLink() && result.sl.IsEmpty() {
		err = result.NextWithContext(ctx)
		return
	}

	return
}

// ListByResourceGroupPreparer prepares the ListByResourceGroup request.
func (client SnapshotsClient) ListByResourceGroupPreparer(ctx context.Context, resourceGroupName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsGet(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// ListByResourceGroupSender sends the ListByResourceGroup request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) ListByResourceGroupSender(req *http.Request) (*http.Response, error) {
	return client.Send(req, azure.DoRetryWithRegistration(client.Client))
}

// ListByResourceGroupResponder handles the response to the ListByResourceGroup request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) ListByResourceGroupResponder(resp *http.Response) (result SnapshotList, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// listByResourceGroupNextResults retrieves the next set of results, if any.
func (client SnapshotsClient) listByResourceGroupNextResults(ctx context.Context, lastResults SnapshotList) (result SnapshotList, err error) {
	req, err := lastResults.snapshotListPreparer(ctx)
	if err != nil {
		return result, autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listByResourceGroupNextResults", nil, "Failure preparing next results request")
	}
	if req == nil {
		return
	}
	resp, err := client.ListByResourceGroupSender(req)
	if err != nil {
		result.Response = autorest.Response{Response: resp}
		return result, autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listByResourceGroupNextResults", resp, "Failure sending next results request")
	}
	result, err = client.ListByResourceGroupResponder(resp)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "listByResourceGroupNextResults", resp, "Failure responding to next results request")
	}
	return
}

// ListByResourceGroupComplete enumerates all values, automatically crossing page boundaries as required.
func (client SnapshotsClient) ListByResourceGroupComplete(ctx context.Context, resourceGroupName string) (result SnapshotListIterator, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.ListByResourceGroup")
		defer func() {
			sc := -1
			if result.Response().Response.Response != nil {
				sc = result.page.Response().Response.Response.StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	result.page, err = client.ListByResourceGroup(ctx, resourceGroupName)
	return
}

// RevokeAccess revokes access to a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
func (client SnapshotsClient) RevokeAccess(ctx context.Context, resourceGroupName string, snapshotName string) (result SnapshotsRevokeAccessFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.RevokeAccess")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.RevokeAccessPreparer(ctx, resourceGroupName, snapshotName)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "RevokeAccess", nil, "Failure preparing request")
		return
	}

	result, err = client.RevokeAccessSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "RevokeAccess", nil, "Failure sending request")
		return
	}

	return
}

// RevokeAccessPreparer prepares the RevokeAccess request.
func (client SnapshotsClient) RevokeAccessPreparer(ctx context.Context, resourceGroupName string, snapshotName string) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsPost(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}/endGetAccess", pathParameters),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// RevokeAccessSender sends the RevokeAccess request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) RevokeAccessSender(req *http.Request) (future SnapshotsRevokeAccessFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = func(client SnapshotsClient) (osr OperationStatusResponse, err error) {
		var done bool
		done, err = future.DoneWithContext(context.Background(), client)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsRevokeAccessFuture", "Result", future.Response(), "Polling failure")
			return
		}
		if !done {
			err = azure.NewAsyncOpIncompleteError("compute.SnapshotsRevokeAccessFuture")
			return
		}
		sender := autorest.DecorateSender(client, autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...))
		osr.Response.Response, err = future.GetResult(sender)
		if osr.Response.Response == nil && err == nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsRevokeAccessFuture", "Result", nil, "received nil response and error")
		}
		if err == nil && osr.Response.Response.StatusCode != http.StatusNoContent {
			osr, err = client.RevokeAccessResponder(osr.Response.Response)
			if err != nil {
				err = autorest.NewErrorWithError(err, "compute.SnapshotsRevokeAccessFuture", "Result", osr.Response.Response, "Failure responding to request")
			}
		}
		return
	}
	return
}

// RevokeAccessResponder handles the response to the RevokeAccess request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) RevokeAccessResponder(resp *http.Response) (result OperationStatusResponse, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}

// Update updates (patches) a snapshot.
// Parameters:
// resourceGroupName - the name of the resource group.
// snapshotName - the name of the snapshot within the given subscription and resource group.
// snapshot - snapshot object supplied in the body of the Patch snapshot operation.
func (client SnapshotsClient) Update(ctx context.Context, resourceGroupName string, snapshotName string, snapshot SnapshotUpdate) (result SnapshotsUpdateFuture, err error) {
	if tracing.IsEnabled() {
		ctx = tracing.StartSpan(ctx, fqdn+"/SnapshotsClient.Update")
		defer func() {
			sc := -1
			if result.FutureAPI != nil && result.FutureAPI.Response() != nil {
				sc = result.FutureAPI.Response().StatusCode
			}
			tracing.EndSpan(ctx, sc, err)
		}()
	}
	req, err := client.UpdatePreparer(ctx, resourceGroupName, snapshotName, snapshot)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Update", nil, "Failure preparing request")
		return
	}

	result, err = client.UpdateSender(req)
	if err != nil {
		err = autorest.NewErrorWithError(err, "compute.SnapshotsClient", "Update", nil, "Failure sending request")
		return
	}

	return
}

// UpdatePreparer prepares the Update request.
func (client SnapshotsClient) UpdatePreparer(ctx context.Context, resourceGroupName string, snapshotName string, snapshot SnapshotUpdate) (*http.Request, error) {
	pathParameters := map[string]interface{}{
		"resourceGroupName": autorest.Encode("path", resourceGroupName),
		"snapshotName":      autorest.Encode("path", snapshotName),
		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
	}

	const APIVersion = "2016-04-30-preview"
	queryParameters := map[string]interface{}{
		"api-version": APIVersion,
	}

	preparer := autorest.CreatePreparer(
		autorest.AsContentType("application/json; charset=utf-8"),
		autorest.AsPatch(),
		autorest.WithBaseURL(client.BaseURI),
		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/snapshots/{snapshotName}", pathParameters),
		autorest.WithJSON(snapshot),
		autorest.WithQueryParameters(queryParameters))
	return preparer.Prepare((&http.Request{}).WithContext(ctx))
}

// UpdateSender sends the Update request. The method will close the
// http.Response Body if it receives an error.
func (client SnapshotsClient) UpdateSender(req *http.Request) (future SnapshotsUpdateFuture, err error) {
	var resp *http.Response
	resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))
	if err != nil {
		return
	}
	var azf azure.Future
	azf, err = azure.NewFutureFromResponse(resp)
	future.FutureAPI = &azf
	future.Result = func(client SnapshotsClient) (s Snapshot, err error) {
		var done bool
		done, err = future.DoneWithContext(context.Background(), client)
		if err != nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsUpdateFuture", "Result", future.Response(), "Polling failure")
			return
		}
		if !done {
			err = azure.NewAsyncOpIncompleteError("compute.SnapshotsUpdateFuture")
			return
		}
		sender := autorest.DecorateSender(client, autorest.DoRetryForStatusCodes(client.RetryAttempts, client.RetryDuration, autorest.StatusCodesForRetry...))
		s.Response.Response, err = future.GetResult(sender)
		if s.Response.Response == nil && err == nil {
			err = autorest.NewErrorWithError(err, "compute.SnapshotsUpdateFuture", "Result", nil, "received nil response and error")
		}
		if err == nil && s.Response.Response.StatusCode != http.StatusNoContent {
			s, err = client.UpdateResponder(s.Response.Response)
			if err != nil {
				err = autorest.NewErrorWithError(err, "compute.SnapshotsUpdateFuture", "Result", s.Response.Response, "Failure responding to request")
			}
		}
		return
	}
	return
}

// UpdateResponder handles the response to the Update request. The method always
// closes the http.Response Body.
func (client SnapshotsClient) UpdateResponder(resp *http.Response) (result Snapshot, err error) {
	err = autorest.Respond(
		resp,
		azure.WithErrorUnlessStatusCode(http.StatusOK, http.StatusAccepted),
		autorest.ByUnmarshallingJSON(&result),
		autorest.ByClosing())
	result.Response = autorest.Response{Response: resp}
	return
}
