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

package inspector

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

// Previews the agents installed on the EC2 instances that are part of the
// specified assessment target.
func (c *Client) PreviewAgents(ctx context.Context, params *PreviewAgentsInput, optFns ...func(*Options)) (*PreviewAgentsOutput, error) {
	if params == nil {
		params = &PreviewAgentsInput{}
	}

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

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

type PreviewAgentsInput struct {

	// The ARN of the assessment target whose agents you want to preview.
	//
	// This member is required.
	PreviewAgentsArn *string

	// You can use this parameter to indicate the maximum number of items you want in
	// the response. The default value is 10. The maximum value is 500.
	MaxResults *int32

	// You can use this parameter when paginating results. Set the value of this
	// parameter to null on your first call to the PreviewAgents action. Subsequent
	// calls to the action fill nextToken in the request with the value of NextToken
	// from the previous response to continue listing data.
	NextToken *string

	noSmithyDocumentSerde
}

type PreviewAgentsOutput struct {

	// The resulting list of agents.
	//
	// This member is required.
	AgentPreviews []types.AgentPreview

	// When a response is generated, if there is more data to be listed, this
	// parameter is present in the response and contains the value to use for the
	// nextToken parameter in a subsequent pagination request. If there is no more data
	// to be listed, this parameter is set to null.
	NextToken *string

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationPreviewAgentsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpPreviewAgents{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpPreviewAgents{}, 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 = addOpPreviewAgentsValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opPreviewAgents(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
}

// PreviewAgentsAPIClient is a client that implements the PreviewAgents operation.
type PreviewAgentsAPIClient interface {
	PreviewAgents(context.Context, *PreviewAgentsInput, ...func(*Options)) (*PreviewAgentsOutput, error)
}

var _ PreviewAgentsAPIClient = (*Client)(nil)

// PreviewAgentsPaginatorOptions is the paginator options for PreviewAgents
type PreviewAgentsPaginatorOptions struct {
	// You can use this parameter to indicate the maximum number of items you want in
	// the response. The default value is 10. The maximum value is 500.
	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
}

// PreviewAgentsPaginator is a paginator for PreviewAgents
type PreviewAgentsPaginator struct {
	options   PreviewAgentsPaginatorOptions
	client    PreviewAgentsAPIClient
	params    *PreviewAgentsInput
	nextToken *string
	firstPage bool
}

// NewPreviewAgentsPaginator returns a new PreviewAgentsPaginator
func NewPreviewAgentsPaginator(client PreviewAgentsAPIClient, params *PreviewAgentsInput, optFns ...func(*PreviewAgentsPaginatorOptions)) *PreviewAgentsPaginator {
	if params == nil {
		params = &PreviewAgentsInput{}
	}

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

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

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

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

// NextPage retrieves the next PreviewAgents page.
func (p *PreviewAgentsPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*PreviewAgentsOutput, 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.PreviewAgents(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_opPreviewAgents(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "inspector",
		OperationName: "PreviewAgents",
	}
}