// Code generated by smithy-go-codegen DO NOT EDIT.

package ec2

import (
	"context"
	"errors"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/ec2/types"
	smithy "github.com/aws/smithy-go"
	"github.com/aws/smithy-go/middleware"
	smithytime "github.com/aws/smithy-go/time"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	smithywaiter "github.com/aws/smithy-go/waiter"
	"time"
)

// Describes the status of the specified instances or all of your instances. By
// default, only running instances are described, unless you specifically indicate
// to return the status of all instances.
//
// Instance status includes the following components:
//
//   - Status checks - Amazon EC2 performs status checks on running EC2 instances
//     to identify hardware and software issues. For more information, see [Status checks for your instances]and [Troubleshoot instances with failed status checks]in
//     the Amazon EC2 User Guide.
//
//   - Scheduled events - Amazon EC2 can schedule events (such as reboot, stop, or
//     terminate) for your instances related to hardware issues, software updates, or
//     system maintenance. For more information, see [Scheduled events for your instances]in the Amazon EC2 User Guide.
//
//   - Instance state - You can manage your instances from the moment you launch
//     them through their termination. For more information, see [Instance lifecycle]in the Amazon EC2
//     User Guide.
//
// The Amazon EC2 API follows an eventual consistency model. This means that the
// result of an API command you run that creates or modifies resources might not be
// immediately available to all subsequent commands you run. For guidance on how to
// manage eventual consistency, see [Eventual consistency in the Amazon EC2 API]in the Amazon EC2 Developer Guide.
//
// The order of the elements in the response, including those within nested
// structures, might vary. Applications should not assume the elements appear in a
// particular order.
//
// [Troubleshoot instances with failed status checks]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstances.html
// [Instance lifecycle]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-lifecycle.html
// [Status checks for your instances]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-system-instance-status-check.html
// [Eventual consistency in the Amazon EC2 API]: https://docs.aws.amazon.com/ec2/latest/devguide/eventual-consistency.html
// [Scheduled events for your instances]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-instances-status-check_sched.html
func (c *Client) DescribeInstanceStatus(ctx context.Context, params *DescribeInstanceStatusInput, optFns ...func(*Options)) (*DescribeInstanceStatusOutput, error) {
	if params == nil {
		params = &DescribeInstanceStatusInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "DescribeInstanceStatus", params, optFns, c.addOperationDescribeInstanceStatusMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*DescribeInstanceStatusOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type DescribeInstanceStatusInput struct {

	// Checks whether you have the required permissions for the operation, without
	// actually making the request, and provides an error response. If you have the
	// required permissions, the error response is DryRunOperation . Otherwise, it is
	// UnauthorizedOperation .
	DryRun *bool

	// The filters.
	//
	//   - availability-zone - The Availability Zone of the instance.
	//
	//   - availability-zone-id - The ID of the Availability Zone of the instance.
	//
	//   - event.code - The code for the scheduled event ( instance-reboot |
	//   system-reboot | system-maintenance | instance-retirement | instance-stop ).
	//
	//   - event.description - A description of the event.
	//
	//   - event.instance-event-id - The ID of the event whose date and time you are
	//   modifying.
	//
	//   - event.not-after - The latest end time for the scheduled event (for example,
	//   2014-09-15T17:15:20.000Z ).
	//
	//   - event.not-before - The earliest start time for the scheduled event (for
	//   example, 2014-09-15T17:15:20.000Z ).
	//
	//   - event.not-before-deadline - The deadline for starting the event (for
	//   example, 2014-09-15T17:15:20.000Z ).
	//
	//   - instance-state-code - The code for the instance state, as a 16-bit unsigned
	//   integer. The high byte is used for internal purposes and should be ignored. The
	//   low byte is set based on the state represented. The valid values are 0
	//   (pending), 16 (running), 32 (shutting-down), 48 (terminated), 64 (stopping), and
	//   80 (stopped).
	//
	//   - instance-state-name - The state of the instance ( pending | running |
	//   shutting-down | terminated | stopping | stopped ).
	//
	//   - instance-status.reachability - Filters on instance status where the name is
	//   reachability ( passed | failed | initializing | insufficient-data ).
	//
	//   - instance-status.status - The status of the instance ( ok | impaired |
	//   initializing | insufficient-data | not-applicable ).
	//
	//   - operator.managed - A Boolean that indicates whether this is a managed
	//   instance.
	//
	//   - operator.principal - The principal that manages the instance. Only valid for
	//   managed instances, where managed is true .
	//
	//   - system-status.reachability - Filters on system status where the name is
	//   reachability ( passed | failed | initializing | insufficient-data ).
	//
	//   - system-status.status - The system status of the instance ( ok | impaired |
	//   initializing | insufficient-data | not-applicable ).
	//
	//   - attached-ebs-status.status - The status of the attached EBS volume for the
	//   instance ( ok | impaired | initializing | insufficient-data | not-applicable ).
	Filters []types.Filter

	// When true , includes the health status for all instances. When false , includes
	// the health status for running instances only.
	//
	// Default: false
	IncludeAllInstances *bool

	// The instance IDs.
	//
	// Default: Describes all your instances.
	//
	// Constraints: Maximum 100 explicitly specified instance IDs.
	InstanceIds []string

	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see [Pagination].
	//
	// You cannot specify this parameter and the instance IDs parameter in the same
	// request.
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	MaxResults *int32

	// The token returned from a previous paginated request. Pagination continues from
	// the end of the items returned by the previous request.
	NextToken *string

	noSmithyDocumentSerde
}

type DescribeInstanceStatusOutput struct {

	// Information about the status of the instances.
	InstanceStatuses []types.InstanceStatus

	// The token to include in another request to get the next page of items. This
	// value is null when there are no more items to return.
	NextToken *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeInstanceStatusMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeInstanceStatus{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeInstanceStatus{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DescribeInstanceStatus"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addSpanRetryLoop(stack, options); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addTimeOffsetBuild(stack, c); err != nil {
		return err
	}
	if err = addUserAgentRetryMode(stack, options); err != nil {
		return err
	}
	if err = addCredentialSource(stack, options); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeInstanceStatus(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	if err = addInterceptBeforeRetryLoop(stack, options); err != nil {
		return err
	}
	if err = addInterceptAttempt(stack, options); err != nil {
		return err
	}
	if err = addInterceptExecution(stack, options); err != nil {
		return err
	}
	if err = addInterceptBeforeSerialization(stack, options); err != nil {
		return err
	}
	if err = addInterceptAfterSerialization(stack, options); err != nil {
		return err
	}
	if err = addInterceptBeforeSigning(stack, options); err != nil {
		return err
	}
	if err = addInterceptAfterSigning(stack, options); err != nil {
		return err
	}
	if err = addInterceptTransmit(stack, options); err != nil {
		return err
	}
	if err = addInterceptBeforeDeserialization(stack, options); err != nil {
		return err
	}
	if err = addInterceptAfterDeserialization(stack, options); err != nil {
		return err
	}
	if err = addSpanInitializeStart(stack); err != nil {
		return err
	}
	if err = addSpanInitializeEnd(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestStart(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestEnd(stack); err != nil {
		return err
	}
	return nil
}

// InstanceStatusOkWaiterOptions are waiter options for InstanceStatusOkWaiter
type InstanceStatusOkWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// InstanceStatusOkWaiter will use default minimum delay of 15 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, InstanceStatusOkWaiter will use default max delay of 120 seconds.
	// Note that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *DescribeInstanceStatusInput, *DescribeInstanceStatusOutput, error) (bool, error)
}

// InstanceStatusOkWaiter defines the waiters for InstanceStatusOk
type InstanceStatusOkWaiter struct {
	client DescribeInstanceStatusAPIClient

	options InstanceStatusOkWaiterOptions
}

// NewInstanceStatusOkWaiter constructs a InstanceStatusOkWaiter.
func NewInstanceStatusOkWaiter(client DescribeInstanceStatusAPIClient, optFns ...func(*InstanceStatusOkWaiterOptions)) *InstanceStatusOkWaiter {
	options := InstanceStatusOkWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = instanceStatusOkStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &InstanceStatusOkWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for InstanceStatusOk waiter. The maxWaitDur is
// the maximum wait duration the waiter will wait. The maxWaitDur is required and
// must be greater than zero.
func (w *InstanceStatusOkWaiter) Wait(ctx context.Context, params *DescribeInstanceStatusInput, maxWaitDur time.Duration, optFns ...func(*InstanceStatusOkWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for InstanceStatusOk waiter and returns
// the output of the successful operation. The maxWaitDur is the maximum wait
// duration the waiter will wait. The maxWaitDur is required and must be greater
// than zero.
func (w *InstanceStatusOkWaiter) WaitForOutput(ctx context.Context, params *DescribeInstanceStatusInput, maxWaitDur time.Duration, optFns ...func(*InstanceStatusOkWaiterOptions)) (*DescribeInstanceStatusOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.DescribeInstanceStatus(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for InstanceStatusOk waiter")
}

func instanceStatusOkStateRetryable(ctx context.Context, input *DescribeInstanceStatusInput, output *DescribeInstanceStatusOutput, err error) (bool, error) {

	if err == nil {
		v1 := output.InstanceStatuses
		var v2 []types.SummaryStatus
		for _, v := range v1 {
			v3 := v.InstanceStatus
			var v4 types.SummaryStatus
			if v3 != nil {
				v5 := v3.Status
				v4 = v5
			}
			v2 = append(v2, v4)
		}
		expectedValue := "ok"
		match := len(v2) > 0
		for _, v := range v2 {
			if string(v) != expectedValue {
				match = false
				break
			}
		}

		if match {
			return false, nil
		}
	}

	if err != nil {
		var apiErr smithy.APIError
		ok := errors.As(err, &apiErr)
		if !ok {
			return false, fmt.Errorf("expected err to be of type smithy.APIError, got %w", err)
		}

		if "InvalidInstanceID.NotFound" == apiErr.ErrorCode() {
			return true, nil
		}
	}

	if err != nil {
		return false, err
	}
	return true, nil
}

// SystemStatusOkWaiterOptions are waiter options for SystemStatusOkWaiter
type SystemStatusOkWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// SystemStatusOkWaiter will use default minimum delay of 15 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, SystemStatusOkWaiter will use default max delay of 120 seconds.
	// Note that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state.
	//
	// By default service-modeled logic will populate this option. This option can
	// thus be used to define a custom waiter state with fall-back to service-modeled
	// waiter state mutators.The function returns an error in case of a failure state.
	// In case of retry state, this function returns a bool value of true and nil
	// error, while in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *DescribeInstanceStatusInput, *DescribeInstanceStatusOutput, error) (bool, error)
}

// SystemStatusOkWaiter defines the waiters for SystemStatusOk
type SystemStatusOkWaiter struct {
	client DescribeInstanceStatusAPIClient

	options SystemStatusOkWaiterOptions
}

// NewSystemStatusOkWaiter constructs a SystemStatusOkWaiter.
func NewSystemStatusOkWaiter(client DescribeInstanceStatusAPIClient, optFns ...func(*SystemStatusOkWaiterOptions)) *SystemStatusOkWaiter {
	options := SystemStatusOkWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = systemStatusOkStateRetryable

	for _, fn := range optFns {
		fn(&options)
	}
	return &SystemStatusOkWaiter{
		client:  client,
		options: options,
	}
}

// Wait calls the waiter function for SystemStatusOk waiter. The maxWaitDur is the
// maximum wait duration the waiter will wait. The maxWaitDur is required and must
// be greater than zero.
func (w *SystemStatusOkWaiter) Wait(ctx context.Context, params *DescribeInstanceStatusInput, maxWaitDur time.Duration, optFns ...func(*SystemStatusOkWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for SystemStatusOk waiter and returns
// the output of the successful operation. The maxWaitDur is the maximum wait
// duration the waiter will wait. The maxWaitDur is required and must be greater
// than zero.
func (w *SystemStatusOkWaiter) WaitForOutput(ctx context.Context, params *DescribeInstanceStatusInput, maxWaitDur time.Duration, optFns ...func(*SystemStatusOkWaiterOptions)) (*DescribeInstanceStatusOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

	options := w.options
	for _, fn := range optFns {
		fn(&options)
	}

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.DescribeInstanceStatus(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for SystemStatusOk waiter")
}

func systemStatusOkStateRetryable(ctx context.Context, input *DescribeInstanceStatusInput, output *DescribeInstanceStatusOutput, err error) (bool, error) {

	if err == nil {
		v1 := output.InstanceStatuses
		var v2 []types.SummaryStatus
		for _, v := range v1 {
			v3 := v.SystemStatus
			var v4 types.SummaryStatus
			if v3 != nil {
				v5 := v3.Status
				v4 = v5
			}
			v2 = append(v2, v4)
		}
		expectedValue := "ok"
		match := len(v2) > 0
		for _, v := range v2 {
			if string(v) != expectedValue {
				match = false
				break
			}
		}

		if match {
			return false, nil
		}
	}

	if err != nil {
		return false, err
	}
	return true, nil
}

// DescribeInstanceStatusPaginatorOptions is the paginator options for
// DescribeInstanceStatus
type DescribeInstanceStatusPaginatorOptions struct {
	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see [Pagination].
	//
	// You cannot specify this parameter and the instance IDs parameter in the same
	// request.
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	Limit int32

	// Set to true if pagination should stop if the service returns a pagination token
	// that matches the most recent token provided to the service.
	StopOnDuplicateToken bool
}

// DescribeInstanceStatusPaginator is a paginator for DescribeInstanceStatus
type DescribeInstanceStatusPaginator struct {
	options   DescribeInstanceStatusPaginatorOptions
	client    DescribeInstanceStatusAPIClient
	params    *DescribeInstanceStatusInput
	nextToken *string
	firstPage bool
}

// NewDescribeInstanceStatusPaginator returns a new DescribeInstanceStatusPaginator
func NewDescribeInstanceStatusPaginator(client DescribeInstanceStatusAPIClient, params *DescribeInstanceStatusInput, optFns ...func(*DescribeInstanceStatusPaginatorOptions)) *DescribeInstanceStatusPaginator {
	if params == nil {
		params = &DescribeInstanceStatusInput{}
	}

	options := DescribeInstanceStatusPaginatorOptions{}
	if params.MaxResults != nil {
		options.Limit = *params.MaxResults
	}

	for _, fn := range optFns {
		fn(&options)
	}

	return &DescribeInstanceStatusPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
		nextToken: params.NextToken,
	}
}

// HasMorePages returns a boolean indicating whether more pages are available
func (p *DescribeInstanceStatusPaginator) HasMorePages() bool {
	return p.firstPage || (p.nextToken != nil && len(*p.nextToken) != 0)
}

// NextPage retrieves the next DescribeInstanceStatus page.
func (p *DescribeInstanceStatusPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeInstanceStatusOutput, error) {
	if !p.HasMorePages() {
		return nil, fmt.Errorf("no more pages available")
	}

	params := *p.params
	params.NextToken = p.nextToken

	var limit *int32
	if p.options.Limit > 0 {
		limit = &p.options.Limit
	}
	params.MaxResults = limit

	optFns = append([]func(*Options){
		addIsPaginatorUserAgent,
	}, optFns...)
	result, err := p.client.DescribeInstanceStatus(ctx, &params, optFns...)
	if err != nil {
		return nil, err
	}
	p.firstPage = false

	prevToken := p.nextToken
	p.nextToken = result.NextToken

	if p.options.StopOnDuplicateToken &&
		prevToken != nil &&
		p.nextToken != nil &&
		*prevToken == *p.nextToken {
		p.nextToken = nil
	}

	return result, nil
}

// DescribeInstanceStatusAPIClient is a client that implements the
// DescribeInstanceStatus operation.
type DescribeInstanceStatusAPIClient interface {
	DescribeInstanceStatus(context.Context, *DescribeInstanceStatusInput, ...func(*Options)) (*DescribeInstanceStatusOutput, error)
}

var _ DescribeInstanceStatusAPIClient = (*Client)(nil)

func newServiceMetadataMiddleware_opDescribeInstanceStatus(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		OperationName: "DescribeInstanceStatus",
	}
}
