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

package medialive

import (
	"context"
	"errors"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	"github.com/aws/aws-sdk-go-v2/service/medialive/types"
	"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"
	"github.com/jmespath/go-jmespath"
	"time"
)

// Gets details about a channel
func (c *Client) DescribeChannel(ctx context.Context, params *DescribeChannelInput, optFns ...func(*Options)) (*DescribeChannelOutput, error) {
	if params == nil {
		params = &DescribeChannelInput{}
	}

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

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

// Placeholder documentation for DescribeChannelRequest
type DescribeChannelInput struct {

	// channel ID
	//
	// This member is required.
	ChannelId *string

	noSmithyDocumentSerde
}

// Placeholder documentation for DescribeChannelResponse
type DescribeChannelOutput struct {

	// The unique arn of the channel.
	Arn *string

	// Specification of CDI inputs for this channel
	CdiInputSpecification *types.CdiInputSpecification

	// The class for this channel. STANDARD for a channel with two pipelines or
	// SINGLE_PIPELINE for a channel with one pipeline.
	ChannelClass types.ChannelClass

	// A list of destinations of the channel. For UDP outputs, there is one
	// destination per output. For other types (HLS, for example), there is one
	// destination per packager.
	Destinations []types.OutputDestination

	// The endpoints where outgoing connections initiate from
	EgressEndpoints []types.ChannelEgressEndpoint

	// Encoder Settings
	EncoderSettings *types.EncoderSettings

	// The unique id of the channel.
	Id *string

	// List of input attachments for channel.
	InputAttachments []types.InputAttachment

	// Specification of network and file inputs for this channel
	InputSpecification *types.InputSpecification

	// The log level being written to CloudWatch Logs.
	LogLevel types.LogLevel

	// Maintenance settings for this channel.
	Maintenance *types.MaintenanceStatus

	// The name of the channel. (user-mutable)
	Name *string

	// Runtime details for the pipelines of a running channel.
	PipelineDetails []types.PipelineDetail

	// The number of currently healthy pipelines.
	PipelinesRunningCount int32

	// The Amazon Resource Name (ARN) of the role assumed when running the Channel.
	RoleArn *string

	// Placeholder documentation for ChannelState
	State types.ChannelState

	// A collection of key-value pairs.
	Tags map[string]string

	// Settings for VPC output
	Vpc *types.VpcOutputSettingsDescription

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeChannelMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsRestjson1_serializeOpDescribeChannel{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpDescribeChannel{}, middleware.After)
	if err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = addHTTPSignerV4Middleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecordResponseTiming(stack); 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 = addOpDescribeChannelValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeChannel(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = awsmiddleware.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
	}
	return nil
}

// DescribeChannelAPIClient is a client that implements the DescribeChannel
// operation.
type DescribeChannelAPIClient interface {
	DescribeChannel(context.Context, *DescribeChannelInput, ...func(*Options)) (*DescribeChannelOutput, error)
}

var _ DescribeChannelAPIClient = (*Client)(nil)

// ChannelCreatedWaiterOptions are waiter options for ChannelCreatedWaiter
type ChannelCreatedWaiterOptions 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.
	APIOptions []func(*middleware.Stack) error

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ChannelCreatedWaiter will use default minimum delay of 3 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, ChannelCreatedWaiter 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, *DescribeChannelInput, *DescribeChannelOutput, error) (bool, error)
}

// ChannelCreatedWaiter defines the waiters for ChannelCreated
type ChannelCreatedWaiter struct {
	client DescribeChannelAPIClient

	options ChannelCreatedWaiterOptions
}

// NewChannelCreatedWaiter constructs a ChannelCreatedWaiter.
func NewChannelCreatedWaiter(client DescribeChannelAPIClient, optFns ...func(*ChannelCreatedWaiterOptions)) *ChannelCreatedWaiter {
	options := ChannelCreatedWaiterOptions{}
	options.MinDelay = 3 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = channelCreatedStateRetryable

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

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

// WaitForOutput calls the waiter function for ChannelCreated 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 *ChannelCreatedWaiter) WaitForOutput(ctx context.Context, params *DescribeChannelInput, maxWaitDur time.Duration, optFns ...func(*ChannelCreatedWaiterOptions)) (*DescribeChannelOutput, 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.DescribeChannel(ctx, params, func(o *Options) {
			o.APIOptions = append(o.APIOptions, apiOptions...)
		})

		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 ChannelCreated waiter")
}

func channelCreatedStateRetryable(ctx context.Context, input *DescribeChannelInput, output *DescribeChannelOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "IDLE"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "CREATING"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return true, nil
		}
	}

	if err != nil {
		var errorType *types.InternalServerErrorException
		if errors.As(err, &errorType) {
			return true, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "CREATE_FAILED"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	return true, nil
}

// ChannelDeletedWaiterOptions are waiter options for ChannelDeletedWaiter
type ChannelDeletedWaiterOptions 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.
	APIOptions []func(*middleware.Stack) error

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ChannelDeletedWaiter will use default minimum delay of 5 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, ChannelDeletedWaiter 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, *DescribeChannelInput, *DescribeChannelOutput, error) (bool, error)
}

// ChannelDeletedWaiter defines the waiters for ChannelDeleted
type ChannelDeletedWaiter struct {
	client DescribeChannelAPIClient

	options ChannelDeletedWaiterOptions
}

// NewChannelDeletedWaiter constructs a ChannelDeletedWaiter.
func NewChannelDeletedWaiter(client DescribeChannelAPIClient, optFns ...func(*ChannelDeletedWaiterOptions)) *ChannelDeletedWaiter {
	options := ChannelDeletedWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = channelDeletedStateRetryable

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

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

// WaitForOutput calls the waiter function for ChannelDeleted 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 *ChannelDeletedWaiter) WaitForOutput(ctx context.Context, params *DescribeChannelInput, maxWaitDur time.Duration, optFns ...func(*ChannelDeletedWaiterOptions)) (*DescribeChannelOutput, 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.DescribeChannel(ctx, params, func(o *Options) {
			o.APIOptions = append(o.APIOptions, apiOptions...)
		})

		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 ChannelDeleted waiter")
}

func channelDeletedStateRetryable(ctx context.Context, input *DescribeChannelInput, output *DescribeChannelOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "DELETED"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "DELETING"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return true, nil
		}
	}

	if err != nil {
		var errorType *types.InternalServerErrorException
		if errors.As(err, &errorType) {
			return true, nil
		}
	}

	return true, nil
}

// ChannelRunningWaiterOptions are waiter options for ChannelRunningWaiter
type ChannelRunningWaiterOptions 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.
	APIOptions []func(*middleware.Stack) error

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ChannelRunningWaiter will use default minimum delay of 5 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, ChannelRunningWaiter 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, *DescribeChannelInput, *DescribeChannelOutput, error) (bool, error)
}

// ChannelRunningWaiter defines the waiters for ChannelRunning
type ChannelRunningWaiter struct {
	client DescribeChannelAPIClient

	options ChannelRunningWaiterOptions
}

// NewChannelRunningWaiter constructs a ChannelRunningWaiter.
func NewChannelRunningWaiter(client DescribeChannelAPIClient, optFns ...func(*ChannelRunningWaiterOptions)) *ChannelRunningWaiter {
	options := ChannelRunningWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = channelRunningStateRetryable

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

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

// WaitForOutput calls the waiter function for ChannelRunning 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 *ChannelRunningWaiter) WaitForOutput(ctx context.Context, params *DescribeChannelInput, maxWaitDur time.Duration, optFns ...func(*ChannelRunningWaiterOptions)) (*DescribeChannelOutput, 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.DescribeChannel(ctx, params, func(o *Options) {
			o.APIOptions = append(o.APIOptions, apiOptions...)
		})

		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 ChannelRunning waiter")
}

func channelRunningStateRetryable(ctx context.Context, input *DescribeChannelInput, output *DescribeChannelOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "RUNNING"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "STARTING"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return true, nil
		}
	}

	if err != nil {
		var errorType *types.InternalServerErrorException
		if errors.As(err, &errorType) {
			return true, nil
		}
	}

	return true, nil
}

// ChannelStoppedWaiterOptions are waiter options for ChannelStoppedWaiter
type ChannelStoppedWaiterOptions 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.
	APIOptions []func(*middleware.Stack) error

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// ChannelStoppedWaiter will use default minimum delay of 5 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, ChannelStoppedWaiter 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, *DescribeChannelInput, *DescribeChannelOutput, error) (bool, error)
}

// ChannelStoppedWaiter defines the waiters for ChannelStopped
type ChannelStoppedWaiter struct {
	client DescribeChannelAPIClient

	options ChannelStoppedWaiterOptions
}

// NewChannelStoppedWaiter constructs a ChannelStoppedWaiter.
func NewChannelStoppedWaiter(client DescribeChannelAPIClient, optFns ...func(*ChannelStoppedWaiterOptions)) *ChannelStoppedWaiter {
	options := ChannelStoppedWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = channelStoppedStateRetryable

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

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

// WaitForOutput calls the waiter function for ChannelStopped 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 *ChannelStoppedWaiter) WaitForOutput(ctx context.Context, params *DescribeChannelInput, maxWaitDur time.Duration, optFns ...func(*ChannelStoppedWaiterOptions)) (*DescribeChannelOutput, 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.DescribeChannel(ctx, params, func(o *Options) {
			o.APIOptions = append(o.APIOptions, apiOptions...)
		})

		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 ChannelStopped waiter")
}

func channelStoppedStateRetryable(ctx context.Context, input *DescribeChannelInput, output *DescribeChannelOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "IDLE"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("State", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "STOPPING"
		value, ok := pathValue.(types.ChannelState)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.ChannelState value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return true, nil
		}
	}

	if err != nil {
		var errorType *types.InternalServerErrorException
		if errors.As(err, &errorType) {
			return true, nil
		}
	}

	return true, nil
}

func newServiceMetadataMiddleware_opDescribeChannel(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "medialive",
		OperationName: "DescribeChannel",
	}
}