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

package elasticloadbalancingv2

import (
	"context"
	"fmt"
	"github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Describes the specified listeners or the listeners for the specified
// Application Load Balancer, Network Load Balancer, or Gateway Load Balancer. You
// must specify either a load balancer or one or more listeners.
func (c *Client) DescribeListeners(ctx context.Context, params *DescribeListenersInput, optFns ...func(*Options)) (*DescribeListenersOutput, error) {
	if params == nil {
		params = &DescribeListenersInput{}
	}

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

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

type DescribeListenersInput struct {

	// The Amazon Resource Names (ARN) of the listeners.
	ListenerArns []string

	// The Amazon Resource Name (ARN) of the load balancer.
	LoadBalancerArn *string

	// The marker for the next set of results. (You received this marker from a
	// previous call.)
	Marker *string

	// The maximum number of results to return with this call.
	PageSize *int32

	noSmithyDocumentSerde
}

type DescribeListenersOutput struct {

	// Information about the listeners.
	Listeners []types.Listener

	// If there are additional results, this is the marker for the next set of
	// results. Otherwise, this is null.
	NextMarker *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeListenersMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsquery_serializeOpDescribeListeners{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpDescribeListeners{}, middleware.After)
	if err != nil {
		return err
	}

	if err = addlegacyEndpointContextSetter(stack, options); 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 = addRecordResponseTiming(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 = addCredentialSource(stack, options); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware(options.Region, "DescribeListeners"), middleware.Before); 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 = addInterceptors(stack, options); err != nil {
		return err
	}
	return nil
}

// DescribeListenersPaginatorOptions is the paginator options for DescribeListeners
type DescribeListenersPaginatorOptions struct {
	// 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
}

// DescribeListenersPaginator is a paginator for DescribeListeners
type DescribeListenersPaginator struct {
	options   DescribeListenersPaginatorOptions
	client    DescribeListenersAPIClient
	params    *DescribeListenersInput
	nextToken *string
	firstPage bool
}

// NewDescribeListenersPaginator returns a new DescribeListenersPaginator
func NewDescribeListenersPaginator(client DescribeListenersAPIClient, params *DescribeListenersInput, optFns ...func(*DescribeListenersPaginatorOptions)) *DescribeListenersPaginator {
	if params == nil {
		params = &DescribeListenersInput{}
	}

	options := DescribeListenersPaginatorOptions{}

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

	return &DescribeListenersPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
		nextToken: params.Marker,
	}
}

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

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

	params := *p.params
	params.Marker = p.nextToken

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

	prevToken := p.nextToken
	p.nextToken = result.NextMarker

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

	return result, nil
}

// DescribeListenersAPIClient is a client that implements the DescribeListeners
// operation.
type DescribeListenersAPIClient interface {
	DescribeListeners(context.Context, *DescribeListenersInput, ...func(*Options)) (*DescribeListenersOutput, error)
}

var _ DescribeListenersAPIClient = (*Client)(nil)
