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

package directoryservice

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

// Provides information about the Regions that are configured for multi-Region
// replication.
func (c *Client) DescribeRegions(ctx context.Context, params *DescribeRegionsInput, optFns ...func(*Options)) (*DescribeRegionsOutput, error) {
	if params == nil {
		params = &DescribeRegionsInput{}
	}

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

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

type DescribeRegionsInput struct {

	// The identifier of the directory.
	//
	// This member is required.
	DirectoryId *string

	// The DescribeRegionsResult.NextToken value from a previous call to
	// DescribeRegions . Pass null if this is the first call.
	NextToken *string

	// The name of the Region. For example, us-east-1 .
	RegionName *string

	noSmithyDocumentSerde
}

type DescribeRegionsOutput struct {

	// If not null, more results are available. Pass this value for the NextToken
	// parameter in a subsequent call to DescribeRegions to retrieve the next set of
	// items.
	NextToken *string

	// List of Region information related to the directory for each replicated Region.
	RegionsDescription []types.RegionDescription

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeRegionsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDescribeRegions{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDescribeRegions{}, 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 = addOpDescribeRegionsValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeRegions(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
}

// DescribeRegionsAPIClient is a client that implements the DescribeRegions
// operation.
type DescribeRegionsAPIClient interface {
	DescribeRegions(context.Context, *DescribeRegionsInput, ...func(*Options)) (*DescribeRegionsOutput, error)
}

var _ DescribeRegionsAPIClient = (*Client)(nil)

// DescribeRegionsPaginatorOptions is the paginator options for DescribeRegions
type DescribeRegionsPaginatorOptions 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
}

// DescribeRegionsPaginator is a paginator for DescribeRegions
type DescribeRegionsPaginator struct {
	options   DescribeRegionsPaginatorOptions
	client    DescribeRegionsAPIClient
	params    *DescribeRegionsInput
	nextToken *string
	firstPage bool
}

// NewDescribeRegionsPaginator returns a new DescribeRegionsPaginator
func NewDescribeRegionsPaginator(client DescribeRegionsAPIClient, params *DescribeRegionsInput, optFns ...func(*DescribeRegionsPaginatorOptions)) *DescribeRegionsPaginator {
	if params == nil {
		params = &DescribeRegionsInput{}
	}

	options := DescribeRegionsPaginatorOptions{}

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

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

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

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

	params := *p.params
	params.NextToken = p.nextToken

	result, err := p.client.DescribeRegions(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_opDescribeRegions(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "ds",
		OperationName: "DescribeRegions",
	}
}