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

package rekognition

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

// Gets the face search results for Amazon Rekognition Video face search started by
// StartFaceSearch. The search returns faces in a collection that match the faces
// of persons detected in a video. It also includes the time(s) that faces are
// matched in the video. Face search in a video is an asynchronous operation. You
// start face search by calling to StartFaceSearch which returns a job identifier
// (JobId). When the search operation finishes, Amazon Rekognition Video publishes
// a completion status to the Amazon Simple Notification Service topic registered
// in the initial call to StartFaceSearch. To get the search results, first check
// that the status value published to the Amazon SNS topic is SUCCEEDED. If so,
// call GetFaceSearch and pass the job identifier (JobId) from the initial call to
// StartFaceSearch. For more information, see Searching Faces in a Collection in
// the Amazon Rekognition Developer Guide. The search results are retured in an
// array, Persons, of PersonMatch objects. EachPersonMatch element contains details
// about the matching faces in the input collection, person information (facial
// attributes, bounding boxes, and person identifer) for the matched person, and
// the time the person was matched in the video. GetFaceSearch only returns the
// default
//
// facial attributes (BoundingBox, Confidence, Landmarks, Pose, and
// Quality). The other facial attributes listed in the Face object of the following
// response syntax are not returned. For more information, see FaceDetail in the
// Amazon Rekognition Developer Guide. By default, the Persons array is sorted by
// the time, in milliseconds from the start of the video, persons are matched. You
// can also sort by persons by specifying INDEX for the SORTBY input parameter.
func (c *Client) GetFaceSearch(ctx context.Context, params *GetFaceSearchInput, optFns ...func(*Options)) (*GetFaceSearchOutput, error) {
	if params == nil {
		params = &GetFaceSearchInput{}
	}

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

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

type GetFaceSearchInput struct {

	// The job identifer for the search request. You get the job identifier from an
	// initial call to StartFaceSearch.
	//
	// This member is required.
	JobId *string

	// Maximum number of results to return per paginated call. The largest value you
	// can specify is 1000. If you specify a value greater than 1000, a maximum of 1000
	// results is returned. The default value is 1000.
	MaxResults *int32

	// If the previous response was incomplete (because there is more search results to
	// retrieve), Amazon Rekognition Video returns a pagination token in the response.
	// You can use this pagination token to retrieve the next set of search results.
	NextToken *string

	// Sort to use for grouping faces in the response. Use TIMESTAMP to group faces by
	// the time that they are recognized. Use INDEX to sort by recognized faces.
	SortBy types.FaceSearchSortBy

	noSmithyDocumentSerde
}

type GetFaceSearchOutput struct {

	// The current status of the face search job.
	JobStatus types.VideoJobStatus

	// If the response is truncated, Amazon Rekognition Video returns this token that
	// you can use in the subsequent request to retrieve the next set of search
	// results.
	NextToken *string

	// An array of persons, PersonMatch, in the video whose face(s) match the face(s)
	// in an Amazon Rekognition collection. It also includes time information for when
	// persons are matched in the video. You specify the input collection in an initial
	// call to StartFaceSearch. Each Persons element includes a time the person was
	// matched, face match details (FaceMatches) for matching faces in the collection,
	// and person information (Person) for the matched person.
	Persons []types.PersonMatch

	// If the job fails, StatusMessage provides a descriptive error message.
	StatusMessage *string

	// Information about a video that Amazon Rekognition analyzed. Videometadata is
	// returned in every page of paginated responses from a Amazon Rekognition Video
	// operation.
	VideoMetadata *types.VideoMetadata

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationGetFaceSearchMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpGetFaceSearch{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpGetFaceSearch{}, 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 = addOpGetFaceSearchValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetFaceSearch(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
}

// GetFaceSearchAPIClient is a client that implements the GetFaceSearch operation.
type GetFaceSearchAPIClient interface {
	GetFaceSearch(context.Context, *GetFaceSearchInput, ...func(*Options)) (*GetFaceSearchOutput, error)
}

var _ GetFaceSearchAPIClient = (*Client)(nil)

// GetFaceSearchPaginatorOptions is the paginator options for GetFaceSearch
type GetFaceSearchPaginatorOptions struct {
	// Maximum number of results to return per paginated call. The largest value you
	// can specify is 1000. If you specify a value greater than 1000, a maximum of 1000
	// results is returned. The default value is 1000.
	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
}

// GetFaceSearchPaginator is a paginator for GetFaceSearch
type GetFaceSearchPaginator struct {
	options   GetFaceSearchPaginatorOptions
	client    GetFaceSearchAPIClient
	params    *GetFaceSearchInput
	nextToken *string
	firstPage bool
}

// NewGetFaceSearchPaginator returns a new GetFaceSearchPaginator
func NewGetFaceSearchPaginator(client GetFaceSearchAPIClient, params *GetFaceSearchInput, optFns ...func(*GetFaceSearchPaginatorOptions)) *GetFaceSearchPaginator {
	if params == nil {
		params = &GetFaceSearchInput{}
	}

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

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

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

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

// NextPage retrieves the next GetFaceSearch page.
func (p *GetFaceSearchPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*GetFaceSearchOutput, 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.GetFaceSearch(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_opGetFaceSearch(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "rekognition",
		OperationName: "GetFaceSearch",
	}
}
