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

package ec2

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/ec2/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	"time"
)

// Describes the Spot price history. For more information, see Spot Instance
// pricing history (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-spot-instances-history.html)
// in the Amazon EC2 User Guide for Linux Instances. When you specify a start and
// end time, the operation returns the prices of the instance types within that
// time range. It also returns the last price change before the start time, which
// is the effective price as of the start time.
func (c *Client) DescribeSpotPriceHistory(ctx context.Context, params *DescribeSpotPriceHistoryInput, optFns ...func(*Options)) (*DescribeSpotPriceHistoryOutput, error) {
	if params == nil {
		params = &DescribeSpotPriceHistoryInput{}
	}

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

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

// Contains the parameters for DescribeSpotPriceHistory.
type DescribeSpotPriceHistoryInput struct {

	// Filters the results by the specified Availability Zone.
	AvailabilityZone *string

	// 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 date and time, up to the current date, from which to stop retrieving the
	// price history data, in UTC format (for example, YYYY-MM-DDTHH:MM:SSZ).
	EndTime *time.Time

	// The filters.
	//   - availability-zone - The Availability Zone for which prices should be
	//   returned.
	//   - instance-type - The type of instance (for example, m3.medium ).
	//   - product-description - The product description for the Spot price ( Linux/UNIX
	//   | Red Hat Enterprise Linux | SUSE Linux | Windows | Linux/UNIX (Amazon VPC) |
	//   Red Hat Enterprise Linux (Amazon VPC) | SUSE Linux (Amazon VPC) | Windows
	//   (Amazon VPC) ).
	//   - spot-price - The Spot price. The value must match exactly (or use wildcards;
	//   greater than or less than comparison is not supported).
	//   - timestamp - The time stamp of the Spot price history, in UTC format (for
	//   example, YYYY-MM-DDTHH:MM:SSZ). You can use wildcards (* and ?). Greater than or
	//   less than comparison is not supported.
	Filters []types.Filter

	// Filters the results by the specified instance types.
	InstanceTypes []types.InstanceType

	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see 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

	// Filters the results by the specified basic product descriptions.
	ProductDescriptions []string

	// The date and time, up to the past 90 days, from which to start retrieving the
	// price history data, in UTC format (for example, YYYY-MM-DDTHH:MM:SSZ).
	StartTime *time.Time

	noSmithyDocumentSerde
}

// Contains the output of DescribeSpotPriceHistory.
type DescribeSpotPriceHistoryOutput 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 historical Spot prices.
	SpotPriceHistory []types.SpotPrice

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeSpotPriceHistoryMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeSpotPriceHistory{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeSpotPriceHistory{}, 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 = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeSpotPriceHistory(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
}

// DescribeSpotPriceHistoryAPIClient is a client that implements the
// DescribeSpotPriceHistory operation.
type DescribeSpotPriceHistoryAPIClient interface {
	DescribeSpotPriceHistory(context.Context, *DescribeSpotPriceHistoryInput, ...func(*Options)) (*DescribeSpotPriceHistoryOutput, error)
}

var _ DescribeSpotPriceHistoryAPIClient = (*Client)(nil)

// DescribeSpotPriceHistoryPaginatorOptions is the paginator options for
// DescribeSpotPriceHistory
type DescribeSpotPriceHistoryPaginatorOptions struct {
	// The maximum number of items to return for this request. To get the next page of
	// items, make another request with the token returned in the output. For more
	// information, see 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
}

// DescribeSpotPriceHistoryPaginator is a paginator for DescribeSpotPriceHistory
type DescribeSpotPriceHistoryPaginator struct {
	options   DescribeSpotPriceHistoryPaginatorOptions
	client    DescribeSpotPriceHistoryAPIClient
	params    *DescribeSpotPriceHistoryInput
	nextToken *string
	firstPage bool
}

// NewDescribeSpotPriceHistoryPaginator returns a new
// DescribeSpotPriceHistoryPaginator
func NewDescribeSpotPriceHistoryPaginator(client DescribeSpotPriceHistoryAPIClient, params *DescribeSpotPriceHistoryInput, optFns ...func(*DescribeSpotPriceHistoryPaginatorOptions)) *DescribeSpotPriceHistoryPaginator {
	if params == nil {
		params = &DescribeSpotPriceHistoryInput{}
	}

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

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

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

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

// NextPage retrieves the next DescribeSpotPriceHistory page.
func (p *DescribeSpotPriceHistoryPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeSpotPriceHistoryOutput, 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.DescribeSpotPriceHistory(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_opDescribeSpotPriceHistory(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "ec2",
		OperationName: "DescribeSpotPriceHistory",
	}
}