// Copyright 2019 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
//
//     http://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.
//

syntax = "proto3";

package google.cloud.documentai.v1beta1;

import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/cloud/documentai/v1beta1/geometry.proto";
import "google/longrunning/operations.proto";
import "google/protobuf/timestamp.proto";

option go_package = "google.golang.org/genproto/googleapis/cloud/documentai/v1beta1;documentai";
option java_multiple_files = true;
option java_outer_classname = "DocumentAiProto";
option java_package = "com.google.cloud.documentai.v1beta1";

// Service to parse structured information from unstructured or semi-structured
// documents using state-of-the-art Google AI such as natural language,
// computer vision, and translation.
service DocumentUnderstandingService {
  option (google.api.default_host) = "documentai.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform";

  // LRO endpoint to batch process many documents.
  rpc BatchProcessDocuments(BatchProcessDocumentsRequest)
      returns (google.longrunning.Operation) {
    option (google.api.http) = {
      post: "/v1beta1/{parent=projects/*/locations/*}/documents:batchProcess"
      body: "*"
      additional_bindings {
        post: "/v1beta1/{parent=projects/*}/documents:batchProcess"
        body: "*"
      }
    };
    option (google.api.method_signature) = "requests";
    option (google.longrunning.operation_info) = {
      response_type: "BatchProcessDocumentsResponse"
      metadata_type: "OperationMetadata"
    };
  }
}

// Request to batch process documents as an asynchronous operation.
message BatchProcessDocumentsRequest {
  // Required. Individual requests for each document.
  repeated ProcessDocumentRequest requests = 1
      [(google.api.field_behavior) = REQUIRED];

  // Target project and location to make a call.
  //
  // Format: `projects/{project-id}/locations/{location-id}`.
  //
  // If no location is specified, a region will be chosen automatically.
  string parent = 2;
}

// Request to process one document.
message ProcessDocumentRequest {
  // Required. Information about the input file.
  InputConfig input_config = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The desired output location.
  OutputConfig output_config = 2 [(google.api.field_behavior) = REQUIRED];

  // Specifies a known document type for deeper structure detection. Valid
  // values are currently "general" and "invoice". If not provided, "general"\
  // is used as default. If any other value is given, the request is rejected.
  string document_type = 3;

  // Controls table extraction behavior. If not specified, the system will
  // decide reasonable defaults.
  TableExtractionParams table_extraction_params = 4;

  // Controls form extraction behavior. If not specified, the system will
  // decide reasonable defaults.
  FormExtractionParams form_extraction_params = 5;

  // Controls entity extraction behavior. If not specified, the system will
  // decide reasonable defaults.
  EntityExtractionParams entity_extraction_params = 6;

  // Controls OCR behavior. If not specified, the system will decide reasonable
  // defaults.
  OcrParams ocr_params = 7;
}

// Response to an batch document processing request. This is returned in
// the LRO Operation after the operation is complete.
message BatchProcessDocumentsResponse {
  // Responses for each individual document.
  repeated ProcessDocumentResponse responses = 1;
}

// Response to a single document processing request.
message ProcessDocumentResponse {
  // Information about the input file. This is the same as the corresponding
  // input config in the request.
  InputConfig input_config = 1;

  // The output location of the parsed responses. The responses are written to
  // this location as JSON-serialized `Document` objects.
  OutputConfig output_config = 2;
}

// Parameters to control Optical Character Recognition (OCR) behavior.
message OcrParams {
  // List of languages to use for OCR. In most cases, an empty value
  // yields the best results since it enables automatic language detection. For
  // languages based on the Latin alphabet, setting `language_hints` is not
  // needed. In rare cases, when the language of the text in the image is known,
  // setting a hint will help get better results (although it will be a
  // significant hindrance if the hint is wrong). Document processing returns an
  // error if one or more of the specified languages is not one of the
  // supported languages.
  repeated string language_hints = 1;
}

// Parameters to control table extraction behavior.
message TableExtractionParams {
  // Whether to enable table extraction.
  bool enabled = 1;

  // Optional. Table bounding box hints that can be provided to complex cases
  // which our algorithm cannot locate the table(s) in.
  repeated TableBoundHint table_bound_hints = 2
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Table header hints. The extraction will bias towards producing
  // these terms as table headers, which may improve accuracy.
  repeated string header_hints = 3 [(google.api.field_behavior) = OPTIONAL];

  // Model version of the table extraction system. Default is "builtin/stable".
  // Specify "builtin/latest" for the latest model.
  string model_version = 4;
}

// A hint for a table bounding box on the page for table parsing.
message TableBoundHint {
  // Optional. Page number for multi-paged inputs this hint applies to. If not
  // provided, this hint will apply to all pages by default. This value is
  // 1-based.
  int32 page_number = 1 [(google.api.field_behavior) = OPTIONAL];

  // Bounding box hint for a table on this page. The coordinates must be
  // normalized to [0,1] and the bounding box must be an axis-aligned rectangle.
  BoundingPoly bounding_box = 2;
}

// Parameters to control form extraction behavior.
message FormExtractionParams {
  // Whether to enable form extraction.
  bool enabled = 1;

  // User can provide pairs of (key text, value type) to improve the parsing
  // result.
  //
  // For example, if a document has a field called "Date" that holds a date
  // value and a field called "Amount" that may hold either a currency value
  // (e.g., "$500.00") or a simple number value (e.g., "20"), you could use the
  // following hints: [ {"key": "Date", value_types: [ "DATE"]}, {"key":
  // "Amount", "value_types": [ "PRICE", "NUMBER" ]} ]
  //
  // If the value type is unknown, but you want to provide hints for the keys,
  // you can leave the value_types field blank. e.g. {"key": "Date",
  // "value_types": []}
  repeated KeyValuePairHint key_value_pair_hints = 2;

  // Model version of the form extraction system. Default is
  // "builtin/stable". Specify "builtin/latest" for the latest model.
  string model_version = 3;
}

// User-provided hint for key value pair.
message KeyValuePairHint {
  // The key text for the hint.
  string key = 1;

  // Type of the value. This is case-insensitive, and could be one of:
  // ADDRESS, LOCATION, ORGANIZATION, PERSON, PHONE_NUMBER,
  // ID, NUMBER, EMAIL, PRICE, TERMS, DATE, NAME. Types not in this list will
  // be ignored.
  repeated string value_types = 2;
}

// Parameters to control entity extraction behavior.
message EntityExtractionParams {
  // Whether to enable entity extraction.
  bool enabled = 1;

  // Model version of the entity extraction. Default is
  // "builtin/stable". Specify "builtin/latest" for the latest model.
  string model_version = 2;
}

// The desired input location and metadata.
message InputConfig {
  // Required.
  oneof source {
    // The Google Cloud Storage location to read the input from. This must be a
    // single file.
    GcsSource gcs_source = 1;
  }

  // Required. Mimetype of the input. Current supported mimetypes are
  // application/pdf, image/tiff, and image/gif.
  string mime_type = 2 [(google.api.field_behavior) = REQUIRED];
}

// The desired output location and metadata.
message OutputConfig {
  // Required.
  oneof destination {
    // The Google Cloud Storage location to write the output to.
    GcsDestination gcs_destination = 1;
  }

  // The max number of pages to include into each output Document shard JSON on
  // Google Cloud Storage.
  //
  // The valid range is [1, 100]. If not specified, the default value is 20.
  //
  // For example, for one pdf file with 100 pages, 100 parsed pages will be
  // produced. If `pages_per_shard` = 20, then 5 Document shard JSON files each
  // containing 20 parsed pages will be written under the prefix
  // [OutputConfig.gcs_destination.uri][] and suffix pages-x-to-y.json where
  // x and y are 1-indexed page numbers.
  //
  // Example GCS outputs with 157 pages and pages_per_shard = 50:
  //
  // <prefix>pages-001-to-050.json
  // <prefix>pages-051-to-100.json
  // <prefix>pages-101-to-150.json
  // <prefix>pages-151-to-157.json
  int32 pages_per_shard = 2;
}

// The Google Cloud Storage location where the input file will be read from.
message GcsSource {
  string uri = 1 [(google.api.field_behavior) = REQUIRED];
}

// The Google Cloud Storage location where the output file will be written to.
message GcsDestination {
  string uri = 1 [(google.api.field_behavior) = REQUIRED];
}

// Contains metadata for the BatchProcessDocuments operation.
message OperationMetadata {
  enum State {
    // The default value. This value is used if the state is omitted.
    STATE_UNSPECIFIED = 0;

    // Request is received.
    ACCEPTED = 1;

    // Request operation is waiting for scheduling.
    WAITING = 2;

    // Request is being processed.
    RUNNING = 3;

    // The batch processing completed successfully.
    SUCCEEDED = 4;

    // The batch processing was cancelled.
    CANCELLED = 5;

    // The batch processing has failed.
    FAILED = 6;
  }

  // The state of the current batch processing.
  State state = 1;

  // A message providing more details about the current state of processing.
  string state_message = 2;

  // The creation time of the operation.
  google.protobuf.Timestamp create_time = 3;

  // The last update time of the operation.
  google.protobuf.Timestamp update_time = 4;
}
