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

package sagemaker

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/sagemaker/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"
	"time"
)

// Returns the description of an endpoint.
func (c *Client) DescribeEndpoint(ctx context.Context, params *DescribeEndpointInput, optFns ...func(*Options)) (*DescribeEndpointOutput, error) {
	if params == nil {
		params = &DescribeEndpointInput{}
	}

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

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

type DescribeEndpointInput struct {

	// The name of the endpoint.
	//
	// This member is required.
	EndpointName *string

	noSmithyDocumentSerde
}

type DescribeEndpointOutput struct {

	// A timestamp that shows when the endpoint was created.
	//
	// This member is required.
	CreationTime *time.Time

	// The Amazon Resource Name (ARN) of the endpoint.
	//
	// This member is required.
	EndpointArn *string

	// The name of the endpoint configuration associated with this endpoint.
	//
	// This member is required.
	EndpointConfigName *string

	// Name of the endpoint.
	//
	// This member is required.
	EndpointName *string

	// The status of the endpoint.
	//
	// * OutOfService: Endpoint is not available to take
	// incoming requests.
	//
	// * Creating: CreateEndpoint is executing.
	//
	// * Updating:
	// UpdateEndpoint or UpdateEndpointWeightsAndCapacities is executing.
	//
	// *
	// SystemUpdating: Endpoint is undergoing maintenance and cannot be updated or
	// deleted or re-scaled until it has completed. This maintenance operation does not
	// change any customer-specified values such as VPC config, KMS encryption, model,
	// instance type, or instance count.
	//
	// * RollingBack: Endpoint fails to scale up or
	// down or change its variant weight and is in the process of rolling back to its
	// previous configuration. Once the rollback completes, endpoint returns to an
	// InService status. This transitional status only applies to an endpoint that has
	// autoscaling enabled and is undergoing variant weight or capacity changes as part
	// of an UpdateEndpointWeightsAndCapacities call or when the
	// UpdateEndpointWeightsAndCapacities operation is called explicitly.
	//
	// * InService:
	// Endpoint is available to process incoming requests.
	//
	// * Deleting: DeleteEndpoint
	// is executing.
	//
	// * Failed: Endpoint could not be created, updated, or re-scaled.
	// Use DescribeEndpointOutput$FailureReason for information about the failure.
	// DeleteEndpoint is the only operation that can be performed on a failed endpoint.
	//
	// This member is required.
	EndpointStatus types.EndpointStatus

	// A timestamp that shows when the endpoint was last modified.
	//
	// This member is required.
	LastModifiedTime *time.Time

	// Returns the description of an endpoint configuration created using the
	// CreateEndpointConfig
	// (https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_CreateEndpointConfig.html)
	// API.
	AsyncInferenceConfig *types.AsyncInferenceConfig

	// The currently active data capture configuration used by your Endpoint.
	DataCaptureConfig *types.DataCaptureConfigSummary

	// If the status of the endpoint is Failed, the reason why it failed.
	FailureReason *string

	// The most recent deployment configuration for the endpoint.
	LastDeploymentConfig *types.DeploymentConfig

	// Returns the summary of an in-progress deployment. This field is only returned
	// when the endpoint is creating or updating with a new endpoint configuration.
	PendingDeploymentSummary *types.PendingDeploymentSummary

	// An array of ProductionVariantSummary objects, one for each model hosted behind
	// this endpoint.
	ProductionVariants []types.ProductionVariantSummary

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeEndpointMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDescribeEndpoint{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDescribeEndpoint{}, 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 = addOpDescribeEndpointValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeEndpoint(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
}

// DescribeEndpointAPIClient is a client that implements the DescribeEndpoint
// operation.
type DescribeEndpointAPIClient interface {
	DescribeEndpoint(context.Context, *DescribeEndpointInput, ...func(*Options)) (*DescribeEndpointOutput, error)
}

var _ DescribeEndpointAPIClient = (*Client)(nil)

// EndpointDeletedWaiterOptions are waiter options for EndpointDeletedWaiter
type EndpointDeletedWaiterOptions 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,
	// EndpointDeletedWaiter will use default minimum delay of 30 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, EndpointDeletedWaiter 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, *DescribeEndpointInput, *DescribeEndpointOutput, error) (bool, error)
}

// EndpointDeletedWaiter defines the waiters for EndpointDeleted
type EndpointDeletedWaiter struct {
	client DescribeEndpointAPIClient

	options EndpointDeletedWaiterOptions
}

// NewEndpointDeletedWaiter constructs a EndpointDeletedWaiter.
func NewEndpointDeletedWaiter(client DescribeEndpointAPIClient, optFns ...func(*EndpointDeletedWaiterOptions)) *EndpointDeletedWaiter {
	options := EndpointDeletedWaiterOptions{}
	options.MinDelay = 30 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = endpointDeletedStateRetryable

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

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

// WaitForOutput calls the waiter function for EndpointDeleted 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 *EndpointDeletedWaiter) WaitForOutput(ctx context.Context, params *DescribeEndpointInput, maxWaitDur time.Duration, optFns ...func(*EndpointDeletedWaiterOptions)) (*DescribeEndpointOutput, 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.DescribeEndpoint(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 EndpointDeleted waiter")
}

func endpointDeletedStateRetryable(ctx context.Context, input *DescribeEndpointInput, output *DescribeEndpointOutput, err error) (bool, error) {

	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 "ValidationException" == apiErr.ErrorCode() {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("EndpointStatus", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "Failed"
		value, ok := pathValue.(types.EndpointStatus)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.EndpointStatus value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	return true, nil
}

// EndpointInServiceWaiterOptions are waiter options for EndpointInServiceWaiter
type EndpointInServiceWaiterOptions 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,
	// EndpointInServiceWaiter will use default minimum delay of 30 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, EndpointInServiceWaiter 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, *DescribeEndpointInput, *DescribeEndpointOutput, error) (bool, error)
}

// EndpointInServiceWaiter defines the waiters for EndpointInService
type EndpointInServiceWaiter struct {
	client DescribeEndpointAPIClient

	options EndpointInServiceWaiterOptions
}

// NewEndpointInServiceWaiter constructs a EndpointInServiceWaiter.
func NewEndpointInServiceWaiter(client DescribeEndpointAPIClient, optFns ...func(*EndpointInServiceWaiterOptions)) *EndpointInServiceWaiter {
	options := EndpointInServiceWaiterOptions{}
	options.MinDelay = 30 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = endpointInServiceStateRetryable

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

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

// WaitForOutput calls the waiter function for EndpointInService 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 *EndpointInServiceWaiter) WaitForOutput(ctx context.Context, params *DescribeEndpointInput, maxWaitDur time.Duration, optFns ...func(*EndpointInServiceWaiterOptions)) (*DescribeEndpointOutput, 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.DescribeEndpoint(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 EndpointInService waiter")
}

func endpointInServiceStateRetryable(ctx context.Context, input *DescribeEndpointInput, output *DescribeEndpointOutput, err error) (bool, error) {

	if err == nil {
		pathValue, err := jmespath.Search("EndpointStatus", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "InService"
		value, ok := pathValue.(types.EndpointStatus)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.EndpointStatus value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, nil
		}
	}

	if err == nil {
		pathValue, err := jmespath.Search("EndpointStatus", output)
		if err != nil {
			return false, fmt.Errorf("error evaluating waiter state: %w", err)
		}

		expectedValue := "Failed"
		value, ok := pathValue.(types.EndpointStatus)
		if !ok {
			return false, fmt.Errorf("waiter comparator expected types.EndpointStatus value, got %T", pathValue)
		}

		if string(value) == expectedValue {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	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 "ValidationException" == apiErr.ErrorCode() {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	return true, nil
}

func newServiceMetadataMiddleware_opDescribeEndpoint(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "sagemaker",
		OperationName: "DescribeEndpoint",
	}
}
