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

package neptune

import (
	"context"
	"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/neptune/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Returns information about provisioned DB clusters, and supports pagination.
// This operation can also return information for Amazon RDS clusters and Amazon
// DocDB clusters.
func (c *Client) DescribeDBClusters(ctx context.Context, params *DescribeDBClustersInput, optFns ...func(*Options)) (*DescribeDBClustersOutput, error) {
	if params == nil {
		params = &DescribeDBClustersInput{}
	}

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

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

type DescribeDBClustersInput struct {

	// The user-supplied DB cluster identifier. If this parameter is specified,
	// information from only the specific DB cluster is returned. This parameter isn't
	// case-sensitive. Constraints:
	//   - If supplied, must match an existing DBClusterIdentifier.
	DBClusterIdentifier *string

	// A filter that specifies one or more DB clusters to describe. Supported filters:
	//   - db-cluster-id - Accepts DB cluster identifiers and DB cluster Amazon
	//   Resource Names (ARNs). The results list will only include information about the
	//   DB clusters identified by these ARNs.
	//   - engine - Accepts an engine name (such as neptune ), and restricts the
	//   results list to DB clusters created by that engine.
	// For example, to invoke this API from the Amazon CLI and filter so that only
	// Neptune DB clusters are returned, you could use the following command:
	Filters []types.Filter

	// An optional pagination token provided by a previous DescribeDBClusters request.
	// If this parameter is specified, the response includes only records beyond the
	// marker, up to the value specified by MaxRecords .
	Marker *string

	// The maximum number of records to include in the response. If more records exist
	// than the specified MaxRecords value, a pagination token called a marker is
	// included in the response so that the remaining results can be retrieved.
	// Default: 100 Constraints: Minimum 20, maximum 100.
	MaxRecords *int32

	noSmithyDocumentSerde
}

type DescribeDBClustersOutput struct {

	// Contains a list of DB clusters for the user.
	DBClusters []types.DBCluster

	// A pagination token that can be used in a subsequent DescribeDBClusters request.
	Marker *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeDBClustersMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsquery_serializeOpDescribeDBClusters{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpDescribeDBClusters{}, 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 = addOpDescribeDBClustersValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeDBClusters(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
}

// DescribeDBClustersAPIClient is a client that implements the DescribeDBClusters
// operation.
type DescribeDBClustersAPIClient interface {
	DescribeDBClusters(context.Context, *DescribeDBClustersInput, ...func(*Options)) (*DescribeDBClustersOutput, error)
}

var _ DescribeDBClustersAPIClient = (*Client)(nil)

// DescribeDBClustersPaginatorOptions is the paginator options for
// DescribeDBClusters
type DescribeDBClustersPaginatorOptions struct {
	// The maximum number of records to include in the response. If more records exist
	// than the specified MaxRecords value, a pagination token called a marker is
	// included in the response so that the remaining results can be retrieved.
	// Default: 100 Constraints: Minimum 20, maximum 100.
	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
}

// DescribeDBClustersPaginator is a paginator for DescribeDBClusters
type DescribeDBClustersPaginator struct {
	options   DescribeDBClustersPaginatorOptions
	client    DescribeDBClustersAPIClient
	params    *DescribeDBClustersInput
	nextToken *string
	firstPage bool
}

// NewDescribeDBClustersPaginator returns a new DescribeDBClustersPaginator
func NewDescribeDBClustersPaginator(client DescribeDBClustersAPIClient, params *DescribeDBClustersInput, optFns ...func(*DescribeDBClustersPaginatorOptions)) *DescribeDBClustersPaginator {
	if params == nil {
		params = &DescribeDBClustersInput{}
	}

	options := DescribeDBClustersPaginatorOptions{}
	if params.MaxRecords != nil {
		options.Limit = *params.MaxRecords
	}

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

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

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

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

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

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

	result, err := p.client.DescribeDBClusters(ctx, &params, optFns...)
	if err != nil {
		return nil, err
	}
	p.firstPage = false

	prevToken := p.nextToken
	p.nextToken = result.Marker

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

	return result, nil
}

func newServiceMetadataMiddleware_opDescribeDBClusters(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "rds",
		OperationName: "DescribeDBClusters",
	}
}