// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package documentai

import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	documentaipb "google.golang.org/genproto/googleapis/cloud/documentai/v1beta3"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
)

var newDocumentProcessorClientHook clientHook

// DocumentProcessorCallOptions contains the retry settings for each method of DocumentProcessorClient.
type DocumentProcessorCallOptions struct {
	ProcessDocument       []gax.CallOption
	BatchProcessDocuments []gax.CallOption
	ReviewDocument        []gax.CallOption
}

func defaultDocumentProcessorClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("us-documentai.googleapis.com:443"),
		internaloption.WithDefaultMTLSEndpoint("us-documentai.mtls.googleapis.com:443"),
		internaloption.WithDefaultAudience("https://us-documentai.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultDocumentProcessorCallOptions() *DocumentProcessorCallOptions {
	return &DocumentProcessorCallOptions{
		ProcessDocument: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		BatchProcessDocuments: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ReviewDocument: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

// DocumentProcessorClient is a client for interacting with Cloud Document AI API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type DocumentProcessorClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
	disableDeadlines bool

	// The gRPC API client.
	documentProcessorClient documentaipb.DocumentProcessorServiceClient

	// LROClient is used internally to handle longrunning operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient

	// The call options for this service.
	CallOptions *DocumentProcessorCallOptions

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewDocumentProcessorClient creates a new document processor service client.
//
// Service to call Cloud DocumentAI to process documents according to the
// processor’s definition. Processors are built using state-of-the-art Google
// AI such as natural language, computer vision, and translation to extract
// structured information from unstructured or semi-structured documents.
func NewDocumentProcessorClient(ctx context.Context, opts ...option.ClientOption) (*DocumentProcessorClient, error) {
	clientOpts := defaultDocumentProcessorClientOptions()

	if newDocumentProcessorClientHook != nil {
		hookOpts, err := newDocumentProcessorClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	disableDeadlines, err := checkDisableDeadlines()
	if err != nil {
		return nil, err
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	c := &DocumentProcessorClient{
		connPool:         connPool,
		disableDeadlines: disableDeadlines,
		CallOptions:      defaultDocumentProcessorCallOptions(),

		documentProcessorClient: documentaipb.NewDocumentProcessorServiceClient(connPool),
	}
	c.setGoogleClientInfo()

	c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
		// This error "should not happen", since we are just reusing old connection pool
		// and never actually need to dial.
		// If this does happen, we could leak connp. However, we cannot close conn:
		// If the user invoked the constructor with option.WithGRPCConn,
		// we would close a connection that's still in use.
		// TODO: investigate error conditions.
		return nil, err
	}
	return c, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *DocumentProcessorClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *DocumentProcessorClient) Close() error {
	return c.connPool.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *DocumentProcessorClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// ProcessDocument processes a single document.
func (c *DocumentProcessorClient) ProcessDocument(ctx context.Context, req *documentaipb.ProcessRequest, opts ...gax.CallOption) (*documentaipb.ProcessResponse, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ProcessDocument[0:len(c.CallOptions.ProcessDocument):len(c.CallOptions.ProcessDocument)], opts...)
	var resp *documentaipb.ProcessResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.ProcessDocument(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// BatchProcessDocuments lRO endpoint to batch process many documents. The output is written
// to Cloud Storage as JSON in the [Document] format.
func (c *DocumentProcessorClient) BatchProcessDocuments(ctx context.Context, req *documentaipb.BatchProcessRequest, opts ...gax.CallOption) (*BatchProcessDocumentsOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.BatchProcessDocuments[0:len(c.CallOptions.BatchProcessDocuments):len(c.CallOptions.BatchProcessDocuments)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.BatchProcessDocuments(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &BatchProcessDocumentsOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// ReviewDocument send a document for Human Review. The input document should be processed by
// the specified processor.
func (c *DocumentProcessorClient) ReviewDocument(ctx context.Context, req *documentaipb.ReviewDocumentRequest, opts ...gax.CallOption) (*ReviewDocumentOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "human_review_config", url.QueryEscape(req.GetHumanReviewConfig())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ReviewDocument[0:len(c.CallOptions.ReviewDocument):len(c.CallOptions.ReviewDocument)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.ReviewDocument(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &ReviewDocumentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// BatchProcessDocumentsOperation manages a long-running operation from BatchProcessDocuments.
type BatchProcessDocumentsOperation struct {
	lro *longrunning.Operation
}

// BatchProcessDocumentsOperation returns a new BatchProcessDocumentsOperation from a given name.
// The name must be that of a previously created BatchProcessDocumentsOperation, possibly from a different process.
func (c *DocumentProcessorClient) BatchProcessDocumentsOperation(name string) *BatchProcessDocumentsOperation {
	return &BatchProcessDocumentsOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *BatchProcessDocumentsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.BatchProcessResponse, error) {
	var resp documentaipb.BatchProcessResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *BatchProcessDocumentsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.BatchProcessResponse, error) {
	var resp documentaipb.BatchProcessResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *BatchProcessDocumentsOperation) Metadata() (*documentaipb.BatchProcessMetadata, error) {
	var meta documentaipb.BatchProcessMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *BatchProcessDocumentsOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *BatchProcessDocumentsOperation) Name() string {
	return op.lro.Name()
}

// ReviewDocumentOperation manages a long-running operation from ReviewDocument.
type ReviewDocumentOperation struct {
	lro *longrunning.Operation
}

// ReviewDocumentOperation returns a new ReviewDocumentOperation from a given name.
// The name must be that of a previously created ReviewDocumentOperation, possibly from a different process.
func (c *DocumentProcessorClient) ReviewDocumentOperation(name string) *ReviewDocumentOperation {
	return &ReviewDocumentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *ReviewDocumentOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.ReviewDocumentResponse, error) {
	var resp documentaipb.ReviewDocumentResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *ReviewDocumentOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.ReviewDocumentResponse, error) {
	var resp documentaipb.ReviewDocumentResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *ReviewDocumentOperation) Metadata() (*documentaipb.ReviewDocumentOperationMetadata, error) {
	var meta documentaipb.ReviewDocumentOperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *ReviewDocumentOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *ReviewDocumentOperation) Name() string {
	return op.lro.Name()
}
