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

package ec2

import (
	"context"
	"errors"
	"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"
	smithy "github.com/aws/smithy-go"
	"github.com/aws/smithy-go/middleware"
	smithytime "github.com/aws/smithy-go/time"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	smithywaiter "github.com/aws/smithy-go/waiter"
	"github.com/jmespath/go-jmespath"
	"strconv"
	"time"
)

// Describes the specified key pairs or all of your key pairs. For more
// information about key pairs, see Amazon EC2 key pairs (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html)
// in the Amazon Elastic Compute Cloud User Guide.
func (c *Client) DescribeKeyPairs(ctx context.Context, params *DescribeKeyPairsInput, optFns ...func(*Options)) (*DescribeKeyPairsOutput, error) {
	if params == nil {
		params = &DescribeKeyPairsInput{}
	}

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

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

type DescribeKeyPairsInput 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-pair-id - The ID of the key pair.
	//   - fingerprint - The fingerprint of the key pair.
	//   - key-name - The name of the key pair.
	//   - tag-key - The key of a tag assigned to the resource. Use this filter to find
	//   all resources assigned a tag with a specific key, regardless of the tag value.
	//   - tag : - The key/value combination of a tag assigned to the resource. Use the
	//   tag key in the filter name and the tag value as the filter value. For example,
	//   to find all resources that have a tag with the key Owner and the value TeamA ,
	//   specify tag:Owner for the filter name and TeamA for the filter value.
	Filters []types.Filter

	// If true , the public key material is included in the response. Default: false
	IncludePublicKey *bool

	// The key pair names. Default: Describes all of your key pairs.
	KeyNames []string

	// The IDs of the key pairs.
	KeyPairIds []string

	noSmithyDocumentSerde
}

type DescribeKeyPairsOutput struct {

	// Information about the key pairs.
	KeyPairs []types.KeyPairInfo

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeKeyPairsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeKeyPairs{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeKeyPairs{}, 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_opDescribeKeyPairs(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
}

// DescribeKeyPairsAPIClient is a client that implements the DescribeKeyPairs
// operation.
type DescribeKeyPairsAPIClient interface {
	DescribeKeyPairs(context.Context, *DescribeKeyPairsInput, ...func(*Options)) (*DescribeKeyPairsOutput, error)
}

var _ DescribeKeyPairsAPIClient = (*Client)(nil)

// KeyPairExistsWaiterOptions are waiter options for KeyPairExistsWaiter
type KeyPairExistsWaiterOptions struct {

	// Set of options to modify how an operation is invoked. These apply to all
	// operations invoked for this client. Use functional options on operation call to
	// modify this list for per operation behavior.
	APIOptions []func(*middleware.Stack) error

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// KeyPairExistsWaiter will use default minimum delay of 5 seconds. Note that
	// MinDelay must resolve to a value lesser than or equal to the MaxDelay.
	MinDelay time.Duration

	// MaxDelay is the maximum amount of time to delay between retries. If unset or
	// set to zero, KeyPairExistsWaiter will use default max delay of 120 seconds. Note
	// that MaxDelay must resolve to value greater than or equal to the MinDelay.
	MaxDelay time.Duration

	// LogWaitAttempts is used to enable logging for waiter retry attempts
	LogWaitAttempts bool

	// Retryable is function that can be used to override the service defined
	// waiter-behavior based on operation output, or returned error. This function is
	// used by the waiter to decide if a state is retryable or a terminal state. By
	// default service-modeled logic will populate this option. This option can thus be
	// used to define a custom waiter state with fall-back to service-modeled waiter
	// state mutators.The function returns an error in case of a failure state. In case
	// of retry state, this function returns a bool value of true and nil error, while
	// in case of success it returns a bool value of false and nil error.
	Retryable func(context.Context, *DescribeKeyPairsInput, *DescribeKeyPairsOutput, error) (bool, error)
}

// KeyPairExistsWaiter defines the waiters for KeyPairExists
type KeyPairExistsWaiter struct {
	client DescribeKeyPairsAPIClient

	options KeyPairExistsWaiterOptions
}

// NewKeyPairExistsWaiter constructs a KeyPairExistsWaiter.
func NewKeyPairExistsWaiter(client DescribeKeyPairsAPIClient, optFns ...func(*KeyPairExistsWaiterOptions)) *KeyPairExistsWaiter {
	options := KeyPairExistsWaiterOptions{}
	options.MinDelay = 5 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = keyPairExistsStateRetryable

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

// Wait calls the waiter function for KeyPairExists waiter. The maxWaitDur is the
// maximum wait duration the waiter will wait. The maxWaitDur is required and must
// be greater than zero.
func (w *KeyPairExistsWaiter) Wait(ctx context.Context, params *DescribeKeyPairsInput, maxWaitDur time.Duration, optFns ...func(*KeyPairExistsWaiterOptions)) error {
	_, err := w.WaitForOutput(ctx, params, maxWaitDur, optFns...)
	return err
}

// WaitForOutput calls the waiter function for KeyPairExists waiter and returns
// the output of the successful operation. The maxWaitDur is the maximum wait
// duration the waiter will wait. The maxWaitDur is required and must be greater
// than zero.
func (w *KeyPairExistsWaiter) WaitForOutput(ctx context.Context, params *DescribeKeyPairsInput, maxWaitDur time.Duration, optFns ...func(*KeyPairExistsWaiterOptions)) (*DescribeKeyPairsOutput, error) {
	if maxWaitDur <= 0 {
		return nil, fmt.Errorf("maximum wait time for waiter must be greater than zero")
	}

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

	if options.MaxDelay <= 0 {
		options.MaxDelay = 120 * time.Second
	}

	if options.MinDelay > options.MaxDelay {
		return nil, fmt.Errorf("minimum waiter delay %v must be lesser than or equal to maximum waiter delay of %v.", options.MinDelay, options.MaxDelay)
	}

	ctx, cancelFn := context.WithTimeout(ctx, maxWaitDur)
	defer cancelFn()

	logger := smithywaiter.Logger{}
	remainingTime := maxWaitDur

	var attempt int64
	for {

		attempt++
		apiOptions := options.APIOptions
		start := time.Now()

		if options.LogWaitAttempts {
			logger.Attempt = attempt
			apiOptions = append([]func(*middleware.Stack) error{}, options.APIOptions...)
			apiOptions = append(apiOptions, logger.AddLogger)
		}

		out, err := w.client.DescribeKeyPairs(ctx, params, func(o *Options) {
			o.APIOptions = append(o.APIOptions, apiOptions...)
		})

		retryable, err := options.Retryable(ctx, params, out, err)
		if err != nil {
			return nil, err
		}
		if !retryable {
			return out, nil
		}

		remainingTime -= time.Since(start)
		if remainingTime < options.MinDelay || remainingTime <= 0 {
			break
		}

		// compute exponential backoff between waiter retries
		delay, err := smithywaiter.ComputeDelay(
			attempt, options.MinDelay, options.MaxDelay, remainingTime,
		)
		if err != nil {
			return nil, fmt.Errorf("error computing waiter delay, %w", err)
		}

		remainingTime -= delay
		// sleep for the delay amount before invoking a request
		if err := smithytime.SleepWithContext(ctx, delay); err != nil {
			return nil, fmt.Errorf("request cancelled while waiting, %w", err)
		}
	}
	return nil, fmt.Errorf("exceeded max wait time for KeyPairExists waiter")
}

func keyPairExistsStateRetryable(ctx context.Context, input *DescribeKeyPairsInput, output *DescribeKeyPairsOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("length(KeyPairs[].KeyName) > `0`", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "true"
		bv, err := strconv.ParseBool(expectedValue)
		if err != nil {
			return false, fmt.Errorf("error parsing boolean from string %w", err)
		}
		value, ok := pathValue.(bool)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected bool value got %T", pathValue)
		}

		if value == bv {
			return false, nil
		}
	}

	if err != nil {
		var apiErr smithy.APIError
		ok := errors.As(err, &apiErr)
		if !ok {
			return false, fmt.Errorf("expected err to be of type smithy.APIError, got %w", err)
		}

		if "InvalidKeyPair.NotFound" == apiErr.ErrorCode() {
			return true, nil
		}
	}

	return true, nil
}

func newServiceMetadataMiddleware_opDescribeKeyPairs(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "ec2",
		OperationName: "DescribeKeyPairs",
	}
}