// 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"
	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"
)

// Describes one or more of your VPN connections. For more information, see Amazon
// Web Services Site-to-Site VPN
// (https://docs.aws.amazon.com/vpn/latest/s2svpn/VPC_VPN.html) in the Amazon Web
// Services Site-to-Site VPN User Guide.
func (c *Client) DescribeVpnConnections(ctx context.Context, params *DescribeVpnConnectionsInput, optFns ...func(*Options)) (*DescribeVpnConnectionsOutput, error) {
	if params == nil {
		params = &DescribeVpnConnectionsInput{}
	}

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

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

// Contains the parameters for DescribeVpnConnections.
type DescribeVpnConnectionsInput 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

	// One or more filters.
	//
	// * customer-gateway-configuration - The configuration
	// information for the customer gateway.
	//
	// * customer-gateway-id - The ID of a
	// customer gateway associated with the VPN connection.
	//
	// * state - The state of the
	// VPN connection (pending | available | deleting | deleted).
	//
	// *
	// option.static-routes-only - Indicates whether the connection has static routes
	// only. Used for devices that do not support Border Gateway Protocol (BGP).
	//
	// *
	// route.destination-cidr-block - The destination CIDR block. This corresponds to
	// the subnet used in a customer data center.
	//
	// * bgp-asn - The BGP Autonomous
	// System Number (ASN) associated with a BGP device.
	//
	// * 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.
	//
	// * 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.
	//
	// * type - The type of VPN
	// connection. Currently the only supported type is ipsec.1.
	//
	// * vpn-connection-id -
	// The ID of the VPN connection.
	//
	// * vpn-gateway-id - The ID of a virtual private
	// gateway associated with the VPN connection.
	//
	// * transit-gateway-id - The ID of a
	// transit gateway associated with the VPN connection.
	Filters []types.Filter

	// One or more VPN connection IDs. Default: Describes your VPN connections.
	VpnConnectionIds []string

	noSmithyDocumentSerde
}

// Contains the output of DescribeVpnConnections.
type DescribeVpnConnectionsOutput struct {

	// Information about one or more VPN connections.
	VpnConnections []types.VpnConnection

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeVpnConnectionsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeVpnConnections{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeVpnConnections{}, 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 = stack.Initialize.Add(newServiceMetadataMiddleware_opDescribeVpnConnections(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
}

// DescribeVpnConnectionsAPIClient is a client that implements the
// DescribeVpnConnections operation.
type DescribeVpnConnectionsAPIClient interface {
	DescribeVpnConnections(context.Context, *DescribeVpnConnectionsInput, ...func(*Options)) (*DescribeVpnConnectionsOutput, error)
}

var _ DescribeVpnConnectionsAPIClient = (*Client)(nil)

// VpnConnectionAvailableWaiterOptions are waiter options for
// VpnConnectionAvailableWaiter
type VpnConnectionAvailableWaiterOptions 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,
	// VpnConnectionAvailableWaiter will use default minimum delay of 15 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, VpnConnectionAvailableWaiter 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, *DescribeVpnConnectionsInput, *DescribeVpnConnectionsOutput, error) (bool, error)
}

// VpnConnectionAvailableWaiter defines the waiters for VpnConnectionAvailable
type VpnConnectionAvailableWaiter struct {
	client DescribeVpnConnectionsAPIClient

	options VpnConnectionAvailableWaiterOptions
}

// NewVpnConnectionAvailableWaiter constructs a VpnConnectionAvailableWaiter.
func NewVpnConnectionAvailableWaiter(client DescribeVpnConnectionsAPIClient, optFns ...func(*VpnConnectionAvailableWaiterOptions)) *VpnConnectionAvailableWaiter {
	options := VpnConnectionAvailableWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = vpnConnectionAvailableStateRetryable

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

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

// WaitForOutput calls the waiter function for VpnConnectionAvailable 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 *VpnConnectionAvailableWaiter) WaitForOutput(ctx context.Context, params *DescribeVpnConnectionsInput, maxWaitDur time.Duration, optFns ...func(*VpnConnectionAvailableWaiterOptions)) (*DescribeVpnConnectionsOutput, 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.DescribeVpnConnections(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 VpnConnectionAvailable waiter")
}

func vpnConnectionAvailableStateRetryable(ctx context.Context, input *DescribeVpnConnectionsInput, output *DescribeVpnConnectionsOutput, err error) (bool, error) {

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

		expectedValue := "available"
		var match = true
		listOfValues, ok := pathValue.([]interface{})
		if !ok {
			return false, fmt.Errorf("waiter comparator expected list got %T", pathValue)
		}

		if len(listOfValues) == 0 {
			match = false
		}
		for _, v := range listOfValues {
			value, ok := v.(types.VpnState)
			if !ok {
				return false, fmt.Errorf("waiter comparator expected types.VpnState value, got %T", pathValue)
			}

			if string(value) != expectedValue {
				match = false
			}
		}

		if match {
			return false, nil
		}
	}

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

		expectedValue := "deleting"
		listOfValues, ok := pathValue.([]interface{})
		if !ok {
			return false, fmt.Errorf("waiter comparator expected list got %T", pathValue)
		}

		for _, v := range listOfValues {
			value, ok := v.(types.VpnState)
			if !ok {
				return false, fmt.Errorf("waiter comparator expected types.VpnState value, got %T", pathValue)
			}

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

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

		expectedValue := "deleted"
		listOfValues, ok := pathValue.([]interface{})
		if !ok {
			return false, fmt.Errorf("waiter comparator expected list got %T", pathValue)
		}

		for _, v := range listOfValues {
			value, ok := v.(types.VpnState)
			if !ok {
				return false, fmt.Errorf("waiter comparator expected types.VpnState value, got %T", pathValue)
			}

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

	return true, nil
}

// VpnConnectionDeletedWaiterOptions are waiter options for
// VpnConnectionDeletedWaiter
type VpnConnectionDeletedWaiterOptions 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,
	// VpnConnectionDeletedWaiter will use default minimum delay of 15 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, VpnConnectionDeletedWaiter 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, *DescribeVpnConnectionsInput, *DescribeVpnConnectionsOutput, error) (bool, error)
}

// VpnConnectionDeletedWaiter defines the waiters for VpnConnectionDeleted
type VpnConnectionDeletedWaiter struct {
	client DescribeVpnConnectionsAPIClient

	options VpnConnectionDeletedWaiterOptions
}

// NewVpnConnectionDeletedWaiter constructs a VpnConnectionDeletedWaiter.
func NewVpnConnectionDeletedWaiter(client DescribeVpnConnectionsAPIClient, optFns ...func(*VpnConnectionDeletedWaiterOptions)) *VpnConnectionDeletedWaiter {
	options := VpnConnectionDeletedWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = vpnConnectionDeletedStateRetryable

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

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

// WaitForOutput calls the waiter function for VpnConnectionDeleted 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 *VpnConnectionDeletedWaiter) WaitForOutput(ctx context.Context, params *DescribeVpnConnectionsInput, maxWaitDur time.Duration, optFns ...func(*VpnConnectionDeletedWaiterOptions)) (*DescribeVpnConnectionsOutput, 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.DescribeVpnConnections(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 VpnConnectionDeleted waiter")
}

func vpnConnectionDeletedStateRetryable(ctx context.Context, input *DescribeVpnConnectionsInput, output *DescribeVpnConnectionsOutput, err error) (bool, error) {

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

		expectedValue := "deleted"
		var match = true
		listOfValues, ok := pathValue.([]interface{})
		if !ok {
			return false, fmt.Errorf("waiter comparator expected list got %T", pathValue)
		}

		if len(listOfValues) == 0 {
			match = false
		}
		for _, v := range listOfValues {
			value, ok := v.(types.VpnState)
			if !ok {
				return false, fmt.Errorf("waiter comparator expected types.VpnState value, got %T", pathValue)
			}

			if string(value) != expectedValue {
				match = false
			}
		}

		if match {
			return false, nil
		}
	}

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

		expectedValue := "pending"
		listOfValues, ok := pathValue.([]interface{})
		if !ok {
			return false, fmt.Errorf("waiter comparator expected list got %T", pathValue)
		}

		for _, v := range listOfValues {
			value, ok := v.(types.VpnState)
			if !ok {
				return false, fmt.Errorf("waiter comparator expected types.VpnState value, got %T", pathValue)
			}

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

	return true, nil
}

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