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

package applicationautoscaling

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/applicationautoscaling/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Describes the Application Auto Scaling scaling policies for the specified
// service namespace.
//
// You can filter the results using ResourceId , ScalableDimension , and
// PolicyNames .
//
// For more information, see [Target tracking scaling policies] and [Step scaling policies] in the Application Auto Scaling User Guide.
//
// [Step scaling policies]: https://docs.aws.amazon.com/autoscaling/application/userguide/application-auto-scaling-step-scaling-policies.html
// [Target tracking scaling policies]: https://docs.aws.amazon.com/autoscaling/application/userguide/application-auto-scaling-target-tracking.html
func (c *Client) DescribeScalingPolicies(ctx context.Context, params *DescribeScalingPoliciesInput, optFns ...func(*Options)) (*DescribeScalingPoliciesOutput, error) {
	if params == nil {
		params = &DescribeScalingPoliciesInput{}
	}

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

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

type DescribeScalingPoliciesInput struct {

	// The namespace of the Amazon Web Services service that provides the resource.
	// For a resource provided by your own application or service, use custom-resource
	// instead.
	//
	// This member is required.
	ServiceNamespace types.ServiceNamespace

	// The maximum number of scalable targets. This value can be between 1 and 10. The
	// default value is 10.
	//
	// If this parameter is used, the operation returns up to MaxResults results at a
	// time, along with a NextToken value. To get the next set of results, include the
	// NextToken value in a subsequent call. If this parameter is not used, the
	// operation returns up to 10 results and a NextToken value, if applicable.
	MaxResults *int32

	// The token for the next set of results.
	NextToken *string

	// The names of the scaling policies to describe.
	PolicyNames []string

	// The identifier of the resource associated with the scaling policy. This string
	// consists of the resource type and unique identifier.
	//
	//   - ECS service - The resource type is service and the unique identifier is the
	//   cluster name and service name. Example: service/my-cluster/my-service .
	//
	//   - Spot Fleet - The resource type is spot-fleet-request and the unique
	//   identifier is the Spot Fleet request ID. Example:
	//   spot-fleet-request/sfr-73fbd2ce-aa30-494c-8788-1cee4EXAMPLE .
	//
	//   - EMR cluster - The resource type is instancegroup and the unique identifier
	//   is the cluster ID and instance group ID. Example:
	//   instancegroup/j-2EEZNYKUA1NTV/ig-1791Y4E1L8YI0 .
	//
	//   - AppStream 2.0 fleet - The resource type is fleet and the unique identifier
	//   is the fleet name. Example: fleet/sample-fleet .
	//
	//   - DynamoDB table - The resource type is table and the unique identifier is the
	//   table name. Example: table/my-table .
	//
	//   - DynamoDB global secondary index - The resource type is index and the unique
	//   identifier is the index name. Example: table/my-table/index/my-table-index .
	//
	//   - Aurora DB cluster - The resource type is cluster and the unique identifier
	//   is the cluster name. Example: cluster:my-db-cluster .
	//
	//   - SageMaker endpoint variant - The resource type is variant and the unique
	//   identifier is the resource ID. Example:
	//   endpoint/my-end-point/variant/KMeansClustering .
	//
	//   - Custom resources are not supported with a resource type. This parameter
	//   must specify the OutputValue from the CloudFormation template stack used to
	//   access the resources. The unique identifier is defined by the service provider.
	//   More information is available in our [GitHub repository].
	//
	//   - Amazon Comprehend document classification endpoint - The resource type and
	//   unique identifier are specified using the endpoint ARN. Example:
	//   arn:aws:comprehend:us-west-2:123456789012:document-classifier-endpoint/EXAMPLE
	//   .
	//
	//   - Amazon Comprehend entity recognizer endpoint - The resource type and unique
	//   identifier are specified using the endpoint ARN. Example:
	//   arn:aws:comprehend:us-west-2:123456789012:entity-recognizer-endpoint/EXAMPLE .
	//
	//   - Lambda provisioned concurrency - The resource type is function and the
	//   unique identifier is the function name with a function version or alias name
	//   suffix that is not $LATEST . Example: function:my-function:prod or
	//   function:my-function:1 .
	//
	//   - Amazon Keyspaces table - The resource type is table and the unique
	//   identifier is the table name. Example: keyspace/mykeyspace/table/mytable .
	//
	//   - Amazon MSK cluster - The resource type and unique identifier are specified
	//   using the cluster ARN. Example:
	//   arn:aws:kafka:us-east-1:123456789012:cluster/demo-cluster-1/6357e0b2-0e6a-4b86-a0b4-70df934c2e31-5
	//   .
	//
	//   - Amazon ElastiCache replication group - The resource type is
	//   replication-group and the unique identifier is the replication group name.
	//   Example: replication-group/mycluster .
	//
	//   - Neptune cluster - The resource type is cluster and the unique identifier is
	//   the cluster name. Example: cluster:mycluster .
	//
	//   - SageMaker serverless endpoint - The resource type is variant and the unique
	//   identifier is the resource ID. Example:
	//   endpoint/my-end-point/variant/KMeansClustering .
	//
	//   - SageMaker inference component - The resource type is inference-component and
	//   the unique identifier is the resource ID. Example:
	//   inference-component/my-inference-component .
	//
	//   - Pool of WorkSpaces - The resource type is workspacespool and the unique
	//   identifier is the pool ID. Example: workspacespool/wspool-123456 .
	//
	// [GitHub repository]: https://github.com/aws/aws-auto-scaling-custom-resource
	ResourceId *string

	// The scalable dimension. This string consists of the service namespace, resource
	// type, and scaling property. If you specify a scalable dimension, you must also
	// specify a resource ID.
	//
	//   - ecs:service:DesiredCount - The task count of an ECS service.
	//
	//   - elasticmapreduce:instancegroup:InstanceCount - The instance count of an EMR
	//   Instance Group.
	//
	//   - ec2:spot-fleet-request:TargetCapacity - The target capacity of a Spot Fleet.
	//
	//   - appstream:fleet:DesiredCapacity - The capacity of an AppStream 2.0 fleet.
	//
	//   - dynamodb:table:ReadCapacityUnits - The provisioned read capacity for a
	//   DynamoDB table.
	//
	//   - dynamodb:table:WriteCapacityUnits - The provisioned write capacity for a
	//   DynamoDB table.
	//
	//   - dynamodb:index:ReadCapacityUnits - The provisioned read capacity for a
	//   DynamoDB global secondary index.
	//
	//   - dynamodb:index:WriteCapacityUnits - The provisioned write capacity for a
	//   DynamoDB global secondary index.
	//
	//   - rds:cluster:ReadReplicaCount - The count of Aurora Replicas in an Aurora DB
	//   cluster. Available for Aurora MySQL-compatible edition and Aurora
	//   PostgreSQL-compatible edition.
	//
	//   - sagemaker:variant:DesiredInstanceCount - The number of EC2 instances for a
	//   SageMaker model endpoint variant.
	//
	//   - custom-resource:ResourceType:Property - The scalable dimension for a custom
	//   resource provided by your own application or service.
	//
	//   - comprehend:document-classifier-endpoint:DesiredInferenceUnits - The number
	//   of inference units for an Amazon Comprehend document classification endpoint.
	//
	//   - comprehend:entity-recognizer-endpoint:DesiredInferenceUnits - The number of
	//   inference units for an Amazon Comprehend entity recognizer endpoint.
	//
	//   - lambda:function:ProvisionedConcurrency - The provisioned concurrency for a
	//   Lambda function.
	//
	//   - cassandra:table:ReadCapacityUnits - The provisioned read capacity for an
	//   Amazon Keyspaces table.
	//
	//   - cassandra:table:WriteCapacityUnits - The provisioned write capacity for an
	//   Amazon Keyspaces table.
	//
	//   - kafka:broker-storage:VolumeSize - The provisioned volume size (in GiB) for
	//   brokers in an Amazon MSK cluster.
	//
	//   - elasticache:replication-group:NodeGroups - The number of node groups for an
	//   Amazon ElastiCache replication group.
	//
	//   - elasticache:replication-group:Replicas - The number of replicas per node
	//   group for an Amazon ElastiCache replication group.
	//
	//   - neptune:cluster:ReadReplicaCount - The count of read replicas in an Amazon
	//   Neptune DB cluster.
	//
	//   - sagemaker:variant:DesiredProvisionedConcurrency - The provisioned
	//   concurrency for a SageMaker serverless endpoint.
	//
	//   - sagemaker:inference-component:DesiredCopyCount - The number of copies across
	//   an endpoint for a SageMaker inference component.
	//
	//   - workspaces:workspacespool:DesiredUserSessions - The number of user sessions
	//   for the WorkSpaces in the pool.
	ScalableDimension types.ScalableDimension

	noSmithyDocumentSerde
}

type DescribeScalingPoliciesOutput struct {

	// The token required to get the next set of results. This value is null if there
	// are no more results to return.
	NextToken *string

	// Information about the scaling policies.
	ScalingPolicies []types.ScalingPolicy

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeScalingPoliciesMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDescribeScalingPolicies{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDescribeScalingPolicies{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DescribeScalingPolicies"); 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 = 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 = addOpDescribeScalingPoliciesValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeScalingPolicies(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
	}
	return nil
}

// DescribeScalingPoliciesPaginatorOptions is the paginator options for
// DescribeScalingPolicies
type DescribeScalingPoliciesPaginatorOptions struct {
	// The maximum number of scalable targets. This value can be between 1 and 10. The
	// default value is 10.
	//
	// If this parameter is used, the operation returns up to MaxResults results at a
	// time, along with a NextToken value. To get the next set of results, include the
	// NextToken value in a subsequent call. If this parameter is not used, the
	// operation returns up to 10 results and a NextToken value, if applicable.
	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
}

// DescribeScalingPoliciesPaginator is a paginator for DescribeScalingPolicies
type DescribeScalingPoliciesPaginator struct {
	options   DescribeScalingPoliciesPaginatorOptions
	client    DescribeScalingPoliciesAPIClient
	params    *DescribeScalingPoliciesInput
	nextToken *string
	firstPage bool
}

// NewDescribeScalingPoliciesPaginator returns a new
// DescribeScalingPoliciesPaginator
func NewDescribeScalingPoliciesPaginator(client DescribeScalingPoliciesAPIClient, params *DescribeScalingPoliciesInput, optFns ...func(*DescribeScalingPoliciesPaginatorOptions)) *DescribeScalingPoliciesPaginator {
	if params == nil {
		params = &DescribeScalingPoliciesInput{}
	}

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

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

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

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

// NextPage retrieves the next DescribeScalingPolicies page.
func (p *DescribeScalingPoliciesPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeScalingPoliciesOutput, 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.DescribeScalingPolicies(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
}

// DescribeScalingPoliciesAPIClient is a client that implements the
// DescribeScalingPolicies operation.
type DescribeScalingPoliciesAPIClient interface {
	DescribeScalingPolicies(context.Context, *DescribeScalingPoliciesInput, ...func(*Options)) (*DescribeScalingPoliciesOutput, error)
}

var _ DescribeScalingPoliciesAPIClient = (*Client)(nil)

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