// 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.datastore.admin.v1;

import "google/api/field_behavior.proto";
import "google/api/annotations.proto";

option csharp_namespace = "Google.Cloud.Datastore.Admin.V1";
option go_package = "google.golang.org/genproto/googleapis/datastore/admin/v1;admin";
option java_multiple_files = true;
option java_outer_classname = "IndexProto";
option java_package = "com.google.datastore.admin.v1";
option ruby_package = "Google::Cloud::Datastore::Admin::V1";

// A minimal index definition.
message Index {
  // A property of an index.
  message IndexedProperty {
    // Required. The property name to index.
    string name = 1 [(google.api.field_behavior) = REQUIRED];

    // Required. The indexed property's direction.  Must not be DIRECTION_UNSPECIFIED.
    Direction direction = 2 [(google.api.field_behavior) = REQUIRED];
  }

  // For an ordered index, specifies whether each of the entity's ancestors
  // will be included.
  enum AncestorMode {
    // The ancestor mode is unspecified.
    ANCESTOR_MODE_UNSPECIFIED = 0;

    // Do not include the entity's ancestors in the index.
    NONE = 1;

    // Include all the entity's ancestors in the index.
    ALL_ANCESTORS = 2;
  }

  // The direction determines how a property is indexed.
  enum Direction {
    // The direction is unspecified.
    DIRECTION_UNSPECIFIED = 0;

    // The property's values are indexed so as to support sequencing in
    // ascending order and also query by <, >, <=, >=, and =.
    ASCENDING = 1;

    // The property's values are indexed so as to support sequencing in
    // descending order and also query by <, >, <=, >=, and =.
    DESCENDING = 2;
  }

  // The possible set of states of an index.
  enum State {
    // The state is unspecified.
    STATE_UNSPECIFIED = 0;

    // The index is being created, and cannot be used by queries.
    // There is an active long-running operation for the index.
    // The index is updated when writing an entity.
    // Some index data may exist.
    CREATING = 1;

    // The index is ready to be used.
    // The index is updated when writing an entity.
    // The index is fully populated from all stored entities it applies to.
    READY = 2;

    // The index is being deleted, and cannot be used by queries.
    // There is an active long-running operation for the index.
    // The index is not updated when writing an entity.
    // Some index data may exist.
    DELETING = 3;

    // The index was being created or deleted, but something went wrong.
    // The index cannot by used by queries.
    // There is no active long-running operation for the index,
    // and the most recently finished long-running operation failed.
    // The index is not updated when writing an entity.
    // Some index data may exist.
    ERROR = 4;
  }

  // Output only. Project ID.
  string project_id = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The resource ID of the index.
  string index_id = 3 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Required. The entity kind to which this index applies.
  string kind = 4 [(google.api.field_behavior) = REQUIRED];

  // Required. The index's ancestor mode.  Must not be ANCESTOR_MODE_UNSPECIFIED.
  AncestorMode ancestor = 5 [(google.api.field_behavior) = REQUIRED];

  // Required. An ordered sequence of property names and their index attributes.
  repeated IndexedProperty properties = 6 [(google.api.field_behavior) = REQUIRED];

  // Output only. The state of the index.
  State state = 7 [(google.api.field_behavior) = OUTPUT_ONLY];
}
