// 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.dialogflow.v2;

import "google/api/annotations.proto";
import "google/api/resource.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/struct.proto";

option cc_enable_arenas = true;
option csharp_namespace = "Google.Cloud.Dialogflow.V2";
option go_package = "google.golang.org/genproto/googleapis/cloud/dialogflow/v2;dialogflow";
option java_multiple_files = true;
option java_outer_classname = "ContextProto";
option java_package = "com.google.cloud.dialogflow.v2";
option objc_class_prefix = "DF";

// A context represents additional information included with user input or with
// an intent returned by the Dialogflow API. Contexts are helpful for
// differentiating user input which may be vague or have a different meaning
// depending on additional details from your application such as user setting
// and preferences, previous user input, where the user is in your application,
// geographic location, and so on.
//
// You can include contexts as input parameters of a
// [DetectIntent][google.cloud.dialogflow.v2.Sessions.DetectIntent] (or
// [StreamingDetectIntent][google.cloud.dialogflow.v2.Sessions.StreamingDetectIntent]) request,
// or as output contexts included in the returned intent.
// Contexts expire when an intent is matched, after the number of `DetectIntent`
// requests specified by the `lifespan_count` parameter, or after 20 minutes
// if no intents are matched for a `DetectIntent` request.
//
// For more information about contexts, see the
// [Dialogflow
// documentation](https://cloud.google.com/dialogflow-enterprise/docs/contexts-overview).
service Contexts {
  // Returns the list of all contexts in the specified session.
  rpc ListContexts(ListContextsRequest) returns (ListContextsResponse) {
    option (google.api.http) = {
      get: "/v2/{parent=projects/*/agent/sessions/*}/contexts"
    };
  }

  // Retrieves the specified context.
  rpc GetContext(GetContextRequest) returns (Context) {
    option (google.api.http) = {
      get: "/v2/{name=projects/*/agent/sessions/*/contexts/*}"
    };
  }

  // Creates a context.
  //
  // If the specified context already exists, overrides the context.
  rpc CreateContext(CreateContextRequest) returns (Context) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/agent/sessions/*}/contexts"
      body: "context"
    };
  }

  // Updates the specified context.
  rpc UpdateContext(UpdateContextRequest) returns (Context) {
    option (google.api.http) = {
      patch: "/v2/{context.name=projects/*/agent/sessions/*/contexts/*}"
      body: "context"
    };
  }

  // Deletes the specified context.
  rpc DeleteContext(DeleteContextRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {
      delete: "/v2/{name=projects/*/agent/sessions/*/contexts/*}"
    };
  }

  // Deletes all active contexts in the specified session.
  rpc DeleteAllContexts(DeleteAllContextsRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {
      delete: "/v2/{parent=projects/*/agent/sessions/*}/contexts"
    };
  }
}

// Represents a context.
message Context {
  // Required. The unique identifier of the context. Format:
  // `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`.
  //
  // The `Context ID` is always converted to lowercase, may only contain
  // characters in [a-zA-Z0-9_-%] and may be at most 250 bytes long.
  string name = 1;

  // Optional. The number of conversational query requests after which the
  // context expires. If set to `0` (the default) the context expires
  // immediately. Contexts expire automatically after 20 minutes if there
  // are no matching queries.
  int32 lifespan_count = 2;

  // Optional. The collection of parameters associated with this context.
  // Refer to [this
  // doc](https://cloud.google.com/dialogflow-enterprise/docs/intents-actions-parameters)
  // for syntax.
  google.protobuf.Struct parameters = 3;
}

// The request message for [Contexts.ListContexts][google.cloud.dialogflow.v2.Contexts.ListContexts].
message ListContextsRequest {
  // Required. The session to list all contexts from.
  // Format: `projects/<Project ID>/agent/sessions/<Session ID>`.
  string parent = 1;

  // Optional. The maximum number of items to return in a single page. By
  // default 100 and at most 1000.
  int32 page_size = 2;

  // Optional. The next_page_token value returned from a previous list request.
  string page_token = 3;
}

// The response message for [Contexts.ListContexts][google.cloud.dialogflow.v2.Contexts.ListContexts].
message ListContextsResponse {
  // The list of contexts. There will be a maximum number of items
  // returned based on the page_size field in the request.
  repeated Context contexts = 1;

  // Token to retrieve the next page of results, or empty if there are no
  // more results in the list.
  string next_page_token = 2;
}

// The request message for [Contexts.GetContext][google.cloud.dialogflow.v2.Contexts.GetContext].
message GetContextRequest {
  // Required. The name of the context. Format:
  // `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`.
  string name = 1;
}

// The request message for [Contexts.CreateContext][google.cloud.dialogflow.v2.Contexts.CreateContext].
message CreateContextRequest {
  // Required. The session to create a context for.
  // Format: `projects/<Project ID>/agent/sessions/<Session ID>`.
  string parent = 1;

  // Required. The context to create.
  Context context = 2;
}

// The request message for [Contexts.UpdateContext][google.cloud.dialogflow.v2.Contexts.UpdateContext].
message UpdateContextRequest {
  // Required. The context to update.
  Context context = 1;

  // Optional. The mask to control which fields get updated.
  google.protobuf.FieldMask update_mask = 2;
}

// The request message for [Contexts.DeleteContext][google.cloud.dialogflow.v2.Contexts.DeleteContext].
message DeleteContextRequest {
  // Required. The name of the context to delete. Format:
  // `projects/<Project ID>/agent/sessions/<Session ID>/contexts/<Context ID>`.
  string name = 1;
}

// The request message for [Contexts.DeleteAllContexts][google.cloud.dialogflow.v2.Contexts.DeleteAllContexts].
message DeleteAllContextsRequest {
  // Required. The name of the session to delete all contexts from. Format:
  // `projects/<Project ID>/agent/sessions/<Session ID>`.
  string parent = 1;
}