// Copyright 2018 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 firestore.client;

option java_multiple_files = true;
option java_package = "com.google.firebase.firestore.proto";

option objc_class_prefix = "FSTPB";

import "google/firestore/v1/document.proto";
import "google/protobuf/timestamp.proto";

// A message indicating that the document is known to not exist.
message NoDocument {
  // The name of the document that does not exist, in the standard format:
  // `projects/{project_id}/databases/{database_id}/documents/{document_path}`
  string name = 1;

  // The time at which we observed that it does not exist.
  google.protobuf.Timestamp read_time = 2;
}

// A message indicating that the document that is known to exist but its data
// is unknown.
message UnknownDocument {
  // The name of the document that is known to exist, in the standard format:
  // `projects/{project_id}/databases/{database_id}/documents/{document_path}`
  string name = 1;

  // The version at which we know the document exists.
  google.protobuf.Timestamp version = 2;
}

// Represents either an existing document, the explicitly known absence of a
// document, or a document that is known to exist (at some version) but whose
// contents are unknown.
message MaybeDocument {
  oneof document_type {
    // Used if the document is known to not exist.
    NoDocument no_document = 1;

    // The document (if it exists).
    google.firestore.v1.Document document = 2;

    // Used if the document is known to exist but its data is unknown.
    UnknownDocument unknown_document = 3;
  }

  // `has_committed_mutations` marks documents that were written to the remote
  // document store based on a write acknowledgment. These documents are
  // potentially inconsistent with the backend's copy and use the write's
  // commit version as their document version.
  bool has_committed_mutations = 4;
}