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

package clouddirectory

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/clouddirectory/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Returns a paginated list of child objects that are associated with a given
// object.
func (c *Client) ListObjectChildren(ctx context.Context, params *ListObjectChildrenInput, optFns ...func(*Options)) (*ListObjectChildrenOutput, error) {
	if params == nil {
		params = &ListObjectChildrenInput{}
	}

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

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

type ListObjectChildrenInput struct {

	// The Amazon Resource Name (ARN) that is associated with the Directory where the
	// object resides. For more information, see arns .
	//
	// This member is required.
	DirectoryArn *string

	// The reference that identifies the object for which child objects are being
	// listed.
	//
	// This member is required.
	ObjectReference *types.ObjectReference

	// Represents the manner and timing in which the successful write or update of an
	// object is reflected in a subsequent read operation of that same object.
	ConsistencyLevel types.ConsistencyLevel

	// The maximum number of items to be retrieved in a single call. This is an
	// approximate number.
	MaxResults *int32

	// The pagination token.
	NextToken *string

	noSmithyDocumentSerde
}

type ListObjectChildrenOutput struct {

	// Children structure, which is a map with key as the LinkName and ObjectIdentifier
	// as the value.
	Children map[string]string

	// The pagination token.
	NextToken *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationListObjectChildrenMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsRestjson1_serializeOpListObjectChildren{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpListObjectChildren{}, 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 = addOpListObjectChildrenValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListObjectChildren(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
}

// ListObjectChildrenAPIClient is a client that implements the ListObjectChildren
// operation.
type ListObjectChildrenAPIClient interface {
	ListObjectChildren(context.Context, *ListObjectChildrenInput, ...func(*Options)) (*ListObjectChildrenOutput, error)
}

var _ ListObjectChildrenAPIClient = (*Client)(nil)

// ListObjectChildrenPaginatorOptions is the paginator options for
// ListObjectChildren
type ListObjectChildrenPaginatorOptions struct {
	// The maximum number of items to be retrieved in a single call. This is an
	// approximate number.
	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
}

// ListObjectChildrenPaginator is a paginator for ListObjectChildren
type ListObjectChildrenPaginator struct {
	options   ListObjectChildrenPaginatorOptions
	client    ListObjectChildrenAPIClient
	params    *ListObjectChildrenInput
	nextToken *string
	firstPage bool
}

// NewListObjectChildrenPaginator returns a new ListObjectChildrenPaginator
func NewListObjectChildrenPaginator(client ListObjectChildrenAPIClient, params *ListObjectChildrenInput, optFns ...func(*ListObjectChildrenPaginatorOptions)) *ListObjectChildrenPaginator {
	if params == nil {
		params = &ListObjectChildrenInput{}
	}

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

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

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

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

// NextPage retrieves the next ListObjectChildren page.
func (p *ListObjectChildrenPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*ListObjectChildrenOutput, 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

	result, err := p.client.ListObjectChildren(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
}

func newServiceMetadataMiddleware_opListObjectChildren(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "clouddirectory",
		OperationName: "ListObjectChildren",
	}
}