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

package cognitoidentityprovider

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

// Lists the users in the Amazon Cognito user pool.
func (c *Client) ListUsers(ctx context.Context, params *ListUsersInput, optFns ...func(*Options)) (*ListUsersOutput, error) {
	if params == nil {
		params = &ListUsersInput{}
	}

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

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

// Represents the request to list users.
type ListUsersInput struct {

	// The user pool ID for the user pool on which the search should be performed.
	//
	// This member is required.
	UserPoolId *string

	// An array of strings, where each string is the name of a user attribute to be
	// returned for each user in the search results. If the array is null, all
	// attributes are returned.
	AttributesToGet []string

	// A filter string of the form "AttributeName Filter-Type "AttributeValue"".
	// Quotation marks within the filter string must be escaped using the backslash (\)
	// character. For example, "family_name = \"Reddy\"".
	//
	// * AttributeName: The name of
	// the attribute to search for. You can only search for one attribute at a time.
	//
	// *
	// Filter-Type: For an exact match, use =, for example, "given_name = \"Jon\"". For
	// a prefix ("starts with") match, use ^=, for example, "given_name ^= \"Jon\"".
	//
	// *
	// AttributeValue: The attribute value that must be matched for each user.
	//
	// If the
	// filter string is empty, ListUsers returns all users in the user pool. You can
	// only search for the following standard attributes:
	//
	// * username
	// (case-sensitive)
	//
	// * email
	//
	// * phone_number
	//
	// * name
	//
	// * given_name
	//
	// *
	// family_name
	//
	// * preferred_username
	//
	// * cognito:user_status (called Status in the
	// Console) (case-insensitive)
	//
	// * status (called Enabled in the Console)
	// (case-sensitive)
	//
	// * sub
	//
	// Custom attributes aren't searchable. You can also list
	// users with a client-side filter. The server-side filter matches no more than one
	// attribute. For an advanced search, use a client-side filter with the --query
	// parameter of the list-users action in the CLI. When you use a client-side
	// filter, ListUsers returns a paginated list of zero or more users. You can
	// receive multiple pages in a row with zero results. Repeat the query with each
	// pagination token that is returned until you receive a null pagination token
	// value, and then review the combined result. For more information about
	// server-side and client-side filtering, see FilteringCLI output
	// (https://docs.aws.amazon.com/cli/latest/userguide/cli-usage-filter.html) in the
	// Command Line Interface User Guide
	// (https://docs.aws.amazon.com/cli/latest/userguide/cli-usage-filter.html). For
	// more information, see Searching for Users Using the ListUsers API
	// (https://docs.aws.amazon.com/cognito/latest/developerguide/how-to-manage-user-accounts.html#cognito-user-pools-searching-for-users-using-listusers-api)
	// and Examples of Using the ListUsers API
	// (https://docs.aws.amazon.com/cognito/latest/developerguide/how-to-manage-user-accounts.html#cognito-user-pools-searching-for-users-listusers-api-examples)
	// in the Amazon Cognito Developer Guide.
	Filter *string

	// Maximum number of users to be returned.
	Limit *int32

	// An identifier that was returned from the previous call to this operation, which
	// can be used to return the next set of items in the list.
	PaginationToken *string

	noSmithyDocumentSerde
}

// The response from the request to list users.
type ListUsersOutput struct {

	// An identifier that was returned from the previous call to this operation, which
	// can be used to return the next set of items in the list.
	PaginationToken *string

	// The users returned in the request to list users.
	Users []types.UserType

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationListUsersMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpListUsers{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpListUsers{}, 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 = addOpListUsersValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListUsers(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
}

// ListUsersAPIClient is a client that implements the ListUsers operation.
type ListUsersAPIClient interface {
	ListUsers(context.Context, *ListUsersInput, ...func(*Options)) (*ListUsersOutput, error)
}

var _ ListUsersAPIClient = (*Client)(nil)

// ListUsersPaginatorOptions is the paginator options for ListUsers
type ListUsersPaginatorOptions struct {
	// Maximum number of users to be returned.
	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
}

// ListUsersPaginator is a paginator for ListUsers
type ListUsersPaginator struct {
	options   ListUsersPaginatorOptions
	client    ListUsersAPIClient
	params    *ListUsersInput
	nextToken *string
	firstPage bool
}

// NewListUsersPaginator returns a new ListUsersPaginator
func NewListUsersPaginator(client ListUsersAPIClient, params *ListUsersInput, optFns ...func(*ListUsersPaginatorOptions)) *ListUsersPaginator {
	if params == nil {
		params = &ListUsersInput{}
	}

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

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

	return &ListUsersPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
		nextToken: params.PaginationToken,
	}
}

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

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

	params := *p.params
	params.PaginationToken = p.nextToken

	var limit *int32
	if p.options.Limit > 0 {
		limit = &p.options.Limit
	}
	params.Limit = limit

	result, err := p.client.ListUsers(ctx, &params, optFns...)
	if err != nil {
		return nil, err
	}
	p.firstPage = false

	prevToken := p.nextToken
	p.nextToken = result.PaginationToken

	if p.options.StopOnDuplicateToken &&
		prevToken != nil &&
		p.nextToken != nil &&
		*prevToken == *p.nextToken {
		p.nextToken = nil
	}

	return result, nil
}

func newServiceMetadataMiddleware_opListUsers(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "cognito-idp",
		OperationName: "ListUsers",
	}
}