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

package rekognition

import (
	"context"
	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"
)

// For a given input face ID, searches for matching faces in the collection the
// face belongs to. You get a face ID when you add a face to the collection using
// the IndexFaces operation. The operation compares the features of the input face
// with faces in the specified collection. You can also search faces without
// indexing faces by using the SearchFacesByImage operation. The operation
// response returns an array of faces that match, ordered by similarity score with
// the highest similarity first. More specifically, it is an array of metadata for
// each face match that is found. Along with the metadata, the response also
// includes a confidence value for each face match, indicating the confidence that
// the specific face matches the input face. For an example, see Searching for a
// face using its face ID in the Amazon Rekognition Developer Guide. This operation
// requires permissions to perform the rekognition:SearchFaces action.
func (c *Client) SearchFaces(ctx context.Context, params *SearchFacesInput, optFns ...func(*Options)) (*SearchFacesOutput, error) {
	if params == nil {
		params = &SearchFacesInput{}
	}

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

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

type SearchFacesInput struct {

	// ID of the collection the face belongs to.
	//
	// This member is required.
	CollectionId *string

	// ID of a face to find matches for in the collection.
	//
	// This member is required.
	FaceId *string

	// Optional value specifying the minimum confidence in the face match to return.
	// For example, don't return any matches where confidence in matches is less than
	// 70%. The default value is 80%.
	FaceMatchThreshold *float32

	// Maximum number of faces to return. The operation returns the maximum number of
	// faces with the highest confidence in the match.
	MaxFaces *int32

	noSmithyDocumentSerde
}

type SearchFacesOutput struct {

	// An array of faces that matched the input face, along with the confidence in the
	// match.
	FaceMatches []types.FaceMatch

	// Version number of the face detection model associated with the input collection
	// ( CollectionId ).
	FaceModelVersion *string

	// ID of the face that was searched for matches in a collection.
	SearchedFaceId *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationSearchFacesMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpSearchFaces{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpSearchFaces{}, 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 = addOpSearchFacesValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opSearchFaces(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
}

func newServiceMetadataMiddleware_opSearchFaces(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "rekognition",
		OperationName: "SearchFaces",
	}
}