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

package ec2

import (
	"context"
	"fmt"
	"github.com/aws/aws-sdk-go-v2/service/ec2/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Describes the specified tags for your EC2 resources.
//
// For more information about tags, see [Tag your Amazon EC2 resources] in the Amazon Elastic Compute Cloud User
// Guide.
//
// We strongly recommend using only paginated requests. Unpaginated requests are
// susceptible to throttling and timeouts.
//
// The order of the elements in the response, including those within nested
// structures, might vary. Applications should not assume the elements appear in a
// particular order.
//
// [Tag your Amazon EC2 resources]: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html
func (c *Client) DescribeTags(ctx context.Context, params *DescribeTagsInput, optFns ...func(*Options)) (*DescribeTagsOutput, error) {
	if params == nil {
		params = &DescribeTagsInput{}
	}

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

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

type DescribeTagsInput struct {

	// Checks whether you have the required permissions for the action, without
	// actually making the request, and provides an error response. If you have the
	// required permissions, the error response is DryRunOperation . Otherwise, it is
	// UnauthorizedOperation .
	DryRun *bool

	// The filters.
	//
	//   - key - The tag key.
	//
	//   - resource-id - The ID of the resource.
	//
	//   - resource-type - The resource type. For a list of possible values, see [TagSpecification].
	//
	//   - tag : - The key/value combination of the tag. For example, specify
	//   "tag:Owner" for the filter name and "TeamA" for the filter value to find
	//   resources with the tag "Owner=TeamA".
	//
	//   - value - The tag value.
	//
	// [TagSpecification]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_TagSpecification.html
	Filters []types.Filter

	// The maximum number of items to return for this request. This value can be
	// between 5 and 1000. To get the next page of items, make another request with the
	// token returned in the output. For more information, see [Pagination].
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	MaxResults *int32

	// The token returned from a previous paginated request. Pagination continues from
	// the end of the items returned by the previous request.
	NextToken *string

	noSmithyDocumentSerde
}

type DescribeTagsOutput struct {

	// The token to include in another request to get the next page of items. This
	// value is null when there are no more items to return.
	NextToken *string

	// The tags.
	Tags []types.TagDescription

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeTagsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeTags{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeTags{}, middleware.After)
	if err != nil {
		return err
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(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 = addCredentialSource(stack, options); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware(options.Region, "DescribeTags"), 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
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	if err = addInterceptors(stack, options); err != nil {
		return err
	}
	return nil
}

// DescribeTagsPaginatorOptions is the paginator options for DescribeTags
type DescribeTagsPaginatorOptions struct {
	// The maximum number of items to return for this request. This value can be
	// between 5 and 1000. To get the next page of items, make another request with the
	// token returned in the output. For more information, see [Pagination].
	//
	// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
	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
}

// DescribeTagsPaginator is a paginator for DescribeTags
type DescribeTagsPaginator struct {
	options   DescribeTagsPaginatorOptions
	client    DescribeTagsAPIClient
	params    *DescribeTagsInput
	nextToken *string
	firstPage bool
}

// NewDescribeTagsPaginator returns a new DescribeTagsPaginator
func NewDescribeTagsPaginator(client DescribeTagsAPIClient, params *DescribeTagsInput, optFns ...func(*DescribeTagsPaginatorOptions)) *DescribeTagsPaginator {
	if params == nil {
		params = &DescribeTagsInput{}
	}

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

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

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

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

// NextPage retrieves the next DescribeTags page.
func (p *DescribeTagsPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeTagsOutput, 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

	optFns = append([]func(*Options){
		addIsPaginatorUserAgent,
	}, optFns...)
	result, err := p.client.DescribeTags(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
}

// DescribeTagsAPIClient is a client that implements the DescribeTags operation.
type DescribeTagsAPIClient interface {
	DescribeTags(context.Context, *DescribeTagsInput, ...func(*Options)) (*DescribeTagsOutput, error)
}

var _ DescribeTagsAPIClient = (*Client)(nil)
