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

package organizations

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

// Lists the organizational units (OUs) in a parent organizational unit or root.
// Always check the NextToken response parameter for a null value when calling a
// List* operation. These operations can occasionally return an empty set of
// results even when there are more results available. The NextToken response
// parameter value is null only when there are no more results to display. This
// operation can be called only from the organization's management account or by a
// member account that is a delegated administrator for an Amazon Web Services
// service.
func (c *Client) ListOrganizationalUnitsForParent(ctx context.Context, params *ListOrganizationalUnitsForParentInput, optFns ...func(*Options)) (*ListOrganizationalUnitsForParentOutput, error) {
	if params == nil {
		params = &ListOrganizationalUnitsForParentInput{}
	}

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

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

type ListOrganizationalUnitsForParentInput struct {

	// The unique identifier (ID) of the root or OU whose child OUs you want to list.
	// The regex pattern (http://wikipedia.org/wiki/regex) for a parent ID string
	// requires one of the following:
	//
	// * Root - A string that begins with "r-" followed
	// by from 4 to 32 lowercase letters or digits.
	//
	// * Organizational unit (OU) - A
	// string that begins with "ou-" followed by from 4 to 32 lowercase letters or
	// digits (the ID of the root that the OU is in). This string is followed by a
	// second "-" dash and from 8 to 32 additional lowercase letters or digits.
	//
	// This member is required.
	ParentId *string

	// The total number of results that you want included on each page of the response.
	// If you do not include this parameter, it defaults to a value that is specific to
	// the operation. If additional items exist beyond the maximum you specify, the
	// NextToken response element is present and has a value (is not null). Include
	// that value as the NextToken request parameter in the next call to the operation
	// to get the next part of the results. Note that Organizations might return fewer
	// results than the maximum even when there are more results available. You should
	// check NextToken after every operation to ensure that you receive all of the
	// results.
	MaxResults *int32

	// The parameter for receiving additional results if you receive a NextToken
	// response in a previous request. A NextToken response indicates that more output
	// is available. Set this parameter to the value of the previous call's NextToken
	// response to indicate where the output should continue from.
	NextToken *string

	noSmithyDocumentSerde
}

type ListOrganizationalUnitsForParentOutput struct {

	// If present, indicates that more output is available than is included in the
	// current response. Use this value in the NextToken request parameter in a
	// subsequent call to the operation to get the next part of the output. You should
	// repeat this until the NextToken response element comes back as null.
	NextToken *string

	// A list of the OUs in the specified root or parent OU.
	OrganizationalUnits []types.OrganizationalUnit

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationListOrganizationalUnitsForParentMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpListOrganizationalUnitsForParent{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpListOrganizationalUnitsForParent{}, 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); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addOpListOrganizationalUnitsForParentValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListOrganizationalUnitsForParent(options.Region), 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
	}
	return nil
}

// ListOrganizationalUnitsForParentAPIClient is a client that implements the
// ListOrganizationalUnitsForParent operation.
type ListOrganizationalUnitsForParentAPIClient interface {
	ListOrganizationalUnitsForParent(context.Context, *ListOrganizationalUnitsForParentInput, ...func(*Options)) (*ListOrganizationalUnitsForParentOutput, error)
}

var _ ListOrganizationalUnitsForParentAPIClient = (*Client)(nil)

// ListOrganizationalUnitsForParentPaginatorOptions is the paginator options for
// ListOrganizationalUnitsForParent
type ListOrganizationalUnitsForParentPaginatorOptions struct {
	// The total number of results that you want included on each page of the response.
	// If you do not include this parameter, it defaults to a value that is specific to
	// the operation. If additional items exist beyond the maximum you specify, the
	// NextToken response element is present and has a value (is not null). Include
	// that value as the NextToken request parameter in the next call to the operation
	// to get the next part of the results. Note that Organizations might return fewer
	// results than the maximum even when there are more results available. You should
	// check NextToken after every operation to ensure that you receive all of the
	// results.
	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
}

// ListOrganizationalUnitsForParentPaginator is a paginator for
// ListOrganizationalUnitsForParent
type ListOrganizationalUnitsForParentPaginator struct {
	options   ListOrganizationalUnitsForParentPaginatorOptions
	client    ListOrganizationalUnitsForParentAPIClient
	params    *ListOrganizationalUnitsForParentInput
	nextToken *string
	firstPage bool
}

// NewListOrganizationalUnitsForParentPaginator returns a new
// ListOrganizationalUnitsForParentPaginator
func NewListOrganizationalUnitsForParentPaginator(client ListOrganizationalUnitsForParentAPIClient, params *ListOrganizationalUnitsForParentInput, optFns ...func(*ListOrganizationalUnitsForParentPaginatorOptions)) *ListOrganizationalUnitsForParentPaginator {
	if params == nil {
		params = &ListOrganizationalUnitsForParentInput{}
	}

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

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

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

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

// NextPage retrieves the next ListOrganizationalUnitsForParent page.
func (p *ListOrganizationalUnitsForParentPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*ListOrganizationalUnitsForParentOutput, 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.ListOrganizationalUnitsForParent(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_opListOrganizationalUnitsForParent(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "organizations",
		OperationName: "ListOrganizationalUnitsForParent",
	}
}