// 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"
	smithytime "github.com/aws/smithy-go/time"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	smithywaiter "github.com/aws/smithy-go/waiter"
	"time"
)

// Describes the specified EBS snapshots available to you or all of the EBS
// snapshots available to you.
//
// The snapshots available to you include public snapshots, private snapshots that
// you own, and private snapshots owned by other Amazon Web Services accounts for
// which you have explicit create volume permissions.
//
// The create volume permissions fall into the following categories:
//
//   - public: The owner of the snapshot granted create volume permissions for the
//     snapshot to the all group. All Amazon Web Services accounts have create volume
//     permissions for these snapshots.
//
//   - explicit: The owner of the snapshot granted create volume permissions to a
//     specific Amazon Web Services account.
//
//   - implicit: An Amazon Web Services account has implicit create volume
//     permissions for all snapshots it owns.
//
// The list of snapshots returned can be filtered by specifying snapshot IDs,
// snapshot owners, or Amazon Web Services accounts with create volume permissions.
// If no options are specified, Amazon EC2 returns all snapshots for which you have
// create volume permissions.
//
// If you specify one or more snapshot IDs, only snapshots that have the specified
// IDs are returned. If you specify an invalid snapshot ID, an error is returned.
// If you specify a snapshot ID for which you do not have access, it is not
// included in the returned results.
//
// If you specify one or more snapshot owners using the OwnerIds option, only
// snapshots from the specified owners and for which you have access are returned.
// The results can include the Amazon Web Services account IDs of the specified
// owners, amazon for snapshots owned by Amazon, or self for snapshots that you
// own.
//
// If you specify a list of restorable users, only snapshots with create snapshot
// permissions for those users are returned. You can specify Amazon Web Services
// account IDs (if you own the snapshots), self for snapshots for which you own or
// have explicit permissions, or all for public snapshots.
//
// If you are describing a long list of snapshots, we recommend that you paginate
// the output to make the list more manageable. For more information, see [Pagination].
//
// For more information about EBS snapshots, see [Amazon EBS snapshots] in the Amazon EBS User Guide.
//
// We strongly recommend using only paginated requests. Unpaginated requests are
// susceptible to throttling and timeouts.
//
// [Pagination]: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Query-Requests.html#api-pagination
// [Amazon EBS snapshots]: https://docs.aws.amazon.com/ebs/latest/userguide/ebs-snapshots.html
func (c *Client) DescribeSnapshots(ctx context.Context, params *DescribeSnapshotsInput, optFns ...func(*Options)) (*DescribeSnapshotsOutput, error) {
	if params == nil {
		params = &DescribeSnapshotsInput{}
	}

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

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

type DescribeSnapshotsInput 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.
	//
	//   - description - A description of the snapshot.
	//
	//   - encrypted - Indicates whether the snapshot is encrypted ( true | false )
	//
	//   - owner-alias - The owner alias, from an Amazon-maintained list ( amazon ).
	//   This is not the user-configured Amazon Web Services account alias set using the
	//   IAM console. We recommend that you use the related parameter instead of this
	//   filter.
	//
	//   - owner-id - The Amazon Web Services account ID of the owner. We recommend
	//   that you use the related parameter instead of this filter.
	//
	//   - progress - The progress of the snapshot, as a percentage (for example, 80%).
	//
	//   - snapshot-id - The snapshot ID.
	//
	//   - start-time - The time stamp when the snapshot was initiated.
	//
	//   - status - The status of the snapshot ( pending | completed | error ).
	//
	//   - storage-tier - The storage tier of the snapshot ( archive | standard ).
	//
	//   - transfer-type - The type of operation used to create the snapshot (
	//   time-based | standard ).
	//
	//   - 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.
	//
	//   - volume-id - The ID of the volume the snapshot is for.
	//
	//   - volume-size - The size of the volume, in GiB.
	Filters []types.Filter

	// 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].
	//
	// [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

	// Scopes the results to snapshots with the specified owners. You can specify a
	// combination of Amazon Web Services account IDs, self , and amazon .
	OwnerIds []string

	// The IDs of the Amazon Web Services accounts that can create volumes from the
	// snapshot.
	RestorableByUserIds []string

	// The snapshot IDs.
	//
	// Default: Describes the snapshots for which you have create volume permissions.
	SnapshotIds []string

	noSmithyDocumentSerde
}

type DescribeSnapshotsOutput 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

	// Information about the snapshots.
	Snapshots []types.Snapshot

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

	noSmithyDocumentSerde
}

func (c *Client) addOperationDescribeSnapshotsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsEc2query_serializeOpDescribeSnapshots{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsEc2query_deserializeOpDescribeSnapshots{}, 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, 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 = addCredentialSource(stack, options); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware(options.Region, "DescribeSnapshots"), 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
}

// SnapshotCompletedWaiterOptions are waiter options for SnapshotCompletedWaiter
type SnapshotCompletedWaiterOptions 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.
	//
	// Passing options here is functionally equivalent to passing values to this
	// config's ClientOptions field that extend the inner client's APIOptions directly.
	APIOptions []func(*middleware.Stack) error

	// Functional options to be passed to all operations invoked by this client.
	//
	// Function values that modify the inner APIOptions are applied after the waiter
	// config's own APIOptions modifiers.
	ClientOptions []func(*Options)

	// MinDelay is the minimum amount of time to delay between retries. If unset,
	// SnapshotCompletedWaiter 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, SnapshotCompletedWaiter 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, *DescribeSnapshotsInput, *DescribeSnapshotsOutput, error) (bool, error)
}

// SnapshotCompletedWaiter defines the waiters for SnapshotCompleted
type SnapshotCompletedWaiter struct {
	client DescribeSnapshotsAPIClient

	options SnapshotCompletedWaiterOptions
}

// NewSnapshotCompletedWaiter constructs a SnapshotCompletedWaiter.
func NewSnapshotCompletedWaiter(client DescribeSnapshotsAPIClient, optFns ...func(*SnapshotCompletedWaiterOptions)) *SnapshotCompletedWaiter {
	options := SnapshotCompletedWaiterOptions{}
	options.MinDelay = 15 * time.Second
	options.MaxDelay = 120 * time.Second
	options.Retryable = snapshotCompletedStateRetryable

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

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

// WaitForOutput calls the waiter function for SnapshotCompleted 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 *SnapshotCompletedWaiter) WaitForOutput(ctx context.Context, params *DescribeSnapshotsInput, maxWaitDur time.Duration, optFns ...func(*SnapshotCompletedWaiterOptions)) (*DescribeSnapshotsOutput, 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.DescribeSnapshots(ctx, params, func(o *Options) {
			baseOpts := []func(*Options){
				addIsWaiterUserAgent,
			}
			o.APIOptions = append(o.APIOptions, apiOptions...)
			for _, opt := range baseOpts {
				opt(o)
			}
			for _, opt := range options.ClientOptions {
				opt(o)
			}
		})

		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 SnapshotCompleted waiter")
}

func snapshotCompletedStateRetryable(ctx context.Context, input *DescribeSnapshotsInput, output *DescribeSnapshotsOutput, err error) (bool, error) {

	if err == nil {
		v1 := output.Snapshots
		var v2 []types.SnapshotState
		for _, v := range v1 {
			v3 := v.State
			v2 = append(v2, v3)
		}
		expectedValue := "completed"
		match := len(v2) > 0
		for _, v := range v2 {
			if string(v) != expectedValue {
				match = false
				break
			}
		}

		if match {
			return false, nil
		}
	}

	if err == nil {
		v1 := output.Snapshots
		var v2 []types.SnapshotState
		for _, v := range v1 {
			v3 := v.State
			v2 = append(v2, v3)
		}
		expectedValue := "error"
		var match bool
		for _, v := range v2 {
			if string(v) == expectedValue {
				match = true
				break
			}
		}

		if match {
			return false, fmt.Errorf("waiter state transitioned to Failure")
		}
	}

	if err != nil {
		return false, err
	}
	return true, nil
}

// DescribeSnapshotsPaginatorOptions is the paginator options for DescribeSnapshots
type DescribeSnapshotsPaginatorOptions 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].
	//
	// [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
}

// DescribeSnapshotsPaginator is a paginator for DescribeSnapshots
type DescribeSnapshotsPaginator struct {
	options   DescribeSnapshotsPaginatorOptions
	client    DescribeSnapshotsAPIClient
	params    *DescribeSnapshotsInput
	nextToken *string
	firstPage bool
}

// NewDescribeSnapshotsPaginator returns a new DescribeSnapshotsPaginator
func NewDescribeSnapshotsPaginator(client DescribeSnapshotsAPIClient, params *DescribeSnapshotsInput, optFns ...func(*DescribeSnapshotsPaginatorOptions)) *DescribeSnapshotsPaginator {
	if params == nil {
		params = &DescribeSnapshotsInput{}
	}

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

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

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

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

// NextPage retrieves the next DescribeSnapshots page.
func (p *DescribeSnapshotsPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*DescribeSnapshotsOutput, 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.DescribeSnapshots(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
}

// DescribeSnapshotsAPIClient is a client that implements the DescribeSnapshots
// operation.
type DescribeSnapshotsAPIClient interface {
	DescribeSnapshots(context.Context, *DescribeSnapshotsInput, ...func(*Options)) (*DescribeSnapshotsOutput, error)
}

var _ DescribeSnapshotsAPIClient = (*Client)(nil)
