// 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
//
//     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.cx.v3;

import "google/api/annotations.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/cloud/dialogflow/cx/v3/audio_config.proto";
import "google/cloud/dialogflow/cx/v3/flow.proto";
import "google/cloud/dialogflow/cx/v3/intent.proto";
import "google/cloud/dialogflow/cx/v3/page.proto";
import "google/cloud/dialogflow/cx/v3/response_message.proto";
import "google/cloud/dialogflow/cx/v3/session_entity_type.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/struct.proto";
import "google/rpc/status.proto";
import "google/type/latlng.proto";
import "google/api/client.proto";

option cc_enable_arenas = true;
option csharp_namespace = "Google.Cloud.Dialogflow.Cx.V3";
option go_package = "google.golang.org/genproto/googleapis/cloud/dialogflow/cx/v3;cx";
option java_multiple_files = true;
option java_outer_classname = "SessionProto";
option java_package = "com.google.cloud.dialogflow.cx.v3";
option objc_class_prefix = "DF";
option (google.api.resource_definition) = {
  type: "dialogflow.googleapis.com/Session"
  pattern: "projects/{project}/locations/{location}/agents/{agent}/sessions/{session}"
  pattern: "projects/{project}/locations/{location}/agents/{agent}/environments/{environment}/sessions/{session}"
};

// A session represents an interaction with a user. You retrieve user input
// and pass it to the [DetectIntent][google.cloud.dialogflow.cx.v3.Sessions.DetectIntent] method to determine
// user intent and respond.
service Sessions {
  option (google.api.default_host) = "dialogflow.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-platform,"
      "https://www.googleapis.com/auth/dialogflow";

  // Processes a natural language query and returns structured, actionable data
  // as a result. This method is not idempotent, because it may cause session
  // entity types to be updated, which in turn might affect results of future
  // queries.
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/cx/docs/concept/version).
  rpc DetectIntent(DetectIntentRequest) returns (DetectIntentResponse) {
    option (google.api.http) = {
      post: "/v3/{session=projects/*/locations/*/agents/*/sessions/*}:detectIntent"
      body: "*"
      additional_bindings {
        post: "/v3/{session=projects/*/locations/*/agents/*/environments/*/sessions/*}:detectIntent"
        body: "*"
      }
    };
  }

  // Processes a natural language query in audio format in a streaming fashion
  // and returns structured, actionable data as a result. This method is only
  // available via the gRPC API (not REST).
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/cx/docs/concept/version).
  rpc StreamingDetectIntent(stream StreamingDetectIntentRequest) returns (stream StreamingDetectIntentResponse) {
  }

  // Returns preliminary intent match results, doesn't change the session
  // status.
  rpc MatchIntent(MatchIntentRequest) returns (MatchIntentResponse) {
    option (google.api.http) = {
      post: "/v3/{session=projects/*/locations/*/agents/*/sessions/*}:matchIntent"
      body: "*"
      additional_bindings {
        post: "/v3/{session=projects/*/locations/*/agents/*/environments/*/sessions/*}:matchIntent"
        body: "*"
      }
    };
  }

  // Fulfills a matched intent returned by [MatchIntent][google.cloud.dialogflow.cx.v3.Sessions.MatchIntent].
  // Must be called after [MatchIntent][google.cloud.dialogflow.cx.v3.Sessions.MatchIntent], with input from
  // [MatchIntentResponse][google.cloud.dialogflow.cx.v3.MatchIntentResponse]. Otherwise, the behavior is undefined.
  rpc FulfillIntent(FulfillIntentRequest) returns (FulfillIntentResponse) {
    option (google.api.http) = {
      post: "/v3/{match_intent_request.session=projects/*/locations/*/agents/*/sessions/*}:fulfillIntent"
      body: "*"
      additional_bindings {
        post: "/v3/{match_intent_request.session=projects/*/locations/*/agents/*/environments/*/sessions/*}:fulfillIntent"
        body: "*"
      }
    };
  }
}

// The request to detect user's intent.
message DetectIntentRequest {
  // Required. The name of the session this query is sent to.
  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
  // ID>/sessions/<Session ID>` or `projects/<Project ID>/locations/<Location
  // ID>/agents/<Agent ID>/environments/<Environment ID>/sessions/<Session ID>`.
  // If `Environment ID` is not specified, we assume default 'draft'
  // environment.
  // It's up to the API caller to choose an appropriate `Session ID`. It can be
  // a random number or some type of session identifiers (preferably hashed).
  // The length of the `Session ID` must not exceed 36 characters.
  //
  // For more information, see the [sessions
  // guide](https://cloud.google.com/dialogflow/cx/docs/concept/session).
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/cx/docs/concept/version).
  string session = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Session"
    }
  ];

  // The parameters of this query.
  QueryParameters query_params = 2;

  // Required. The input specification.
  QueryInput query_input = 3 [(google.api.field_behavior) = REQUIRED];

  // Instructs the speech synthesizer how to generate the output audio.
  OutputAudioConfig output_audio_config = 4;
}

// The message returned from the DetectIntent method.
message DetectIntentResponse {
  // Output only. The unique identifier of the response. It can be used to
  // locate a response in the training example set or for reporting issues.
  string response_id = 1;

  // The result of the conversational query.
  QueryResult query_result = 2;

  // The audio data bytes encoded as specified in the request.
  // Note: The output audio is generated based on the values of default platform
  // text responses found in the
  // [`query_result.response_messages`][google.cloud.dialogflow.cx.v3.QueryResult.response_messages] field. If
  // multiple default text responses exist, they will be concatenated when
  // generating audio. If no default platform text responses exist, the
  // generated audio content will be empty.
  //
  // In some scenarios, multiple output audio fields may be present in the
  // response structure. In these cases, only the top-most-level audio output
  // has content.
  bytes output_audio = 4;

  // The config used by the speech synthesizer to generate the output audio.
  OutputAudioConfig output_audio_config = 5;
}

// The top-level message sent by the client to the
// [Sessions.StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
//
// Multiple request messages should be sent in order:
//
// 1.  The first message must contain
// [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
//     [query_input][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_input] plus optionally
//     [query_params][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_params]. If the client
//     wants to receive an audio response, it should also contain
//     [output_audio_config][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.output_audio_config].
//
// 2.  If [query_input][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_input] was set to
//     [query_input.audio.config][google.cloud.dialogflow.cx.v3.AudioInput.config], all subsequent messages
//     must contain [query_input.audio.audio][google.cloud.dialogflow.cx.v3.AudioInput.audio] to continue with
//     Speech recognition.
//     If you decide to rather detect an intent from text
//     input after you already started Speech recognition, please send a message
//     with [query_input.text][google.cloud.dialogflow.cx.v3.QueryInput.text].
//
//     However, note that:
//
//     * Dialogflow will bill you for the audio duration so far.
//     * Dialogflow discards all Speech recognition results in favor of the
//       input text.
//     * Dialogflow will use the language code from the first message.
//
// After you sent all input, you must half-close or abort the request stream.
message StreamingDetectIntentRequest {
  // The name of the session this query is sent to.
  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
  // ID>/sessions/<Session ID>` or `projects/<Project ID>/locations/<Location
  // ID>/agents/<Agent ID>/environments/<Environment ID>/sessions/<Session ID>`.
  // If `Environment ID` is not specified, we assume default 'draft'
  // environment.
  // It's up to the API caller to choose an appropriate `Session ID`. It can be
  // a random number or some type of session identifiers (preferably hashed).
  // The length of the `Session ID` must not exceed 36 characters.
  // Note: session must be set in the first request.
  //
  // For more information, see the [sessions
  // guide](https://cloud.google.com/dialogflow/cx/docs/concept/session).
  //
  // Note: Always use agent versions for production traffic.
  // See [Versions and
  // environments](https://cloud.google.com/dialogflow/cx/docs/concept/version).
  string session = 1 [(google.api.resource_reference) = {
                        type: "dialogflow.googleapis.com/Session"
                      }];

  // The parameters of this query.
  QueryParameters query_params = 2;

  // Required. The input specification.
  QueryInput query_input = 3 [(google.api.field_behavior) = REQUIRED];

  // Instructs the speech synthesizer how to generate the output audio.
  OutputAudioConfig output_audio_config = 4;
}

// The top-level message returned from the `StreamingDetectIntent` method.
//
// Multiple response messages can be returned in order:
//
// 1.  If the input was set to streaming audio, the first one or more messages
//     contain `recognition_result`. Each `recognition_result` represents a more
//     complete transcript of what the user said. The last `recognition_result`
//     has `is_final` set to `true`.
//
// 2.  The last message contains `detect_intent_response`.
message StreamingDetectIntentResponse {
  // The output response.
  oneof response {
    // The result of speech recognition.
    StreamingRecognitionResult recognition_result = 1;

    // The response from detect intent.
    DetectIntentResponse detect_intent_response = 2;
  }
}

// Contains a speech recognition result corresponding to a portion of the audio
// that is currently being processed or an indication that this is the end
// of the single requested utterance.
//
// Example:
//
// 1.  transcript: "tube"
//
// 2.  transcript: "to be a"
//
// 3.  transcript: "to be"
//
// 4.  transcript: "to be or not to be"
//     is_final: true
//
// 5.  transcript: " that's"
//
// 6.  transcript: " that is"
//
// 7.  message_type: `END_OF_SINGLE_UTTERANCE`
//
// 8.  transcript: " that is the question"
//     is_final: true
//
// Only two of the responses contain final results (#4 and #8 indicated by
// `is_final: true`). Concatenating these generates the full transcript: "to be
// or not to be that is the question".
//
// In each response we populate:
//
// *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
//
// *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
message StreamingRecognitionResult {
  // Type of the response message.
  enum MessageType {
    // Not specified. Should never be used.
    MESSAGE_TYPE_UNSPECIFIED = 0;

    // Message contains a (possibly partial) transcript.
    TRANSCRIPT = 1;

    // Event indicates that the server has detected the end of the user's speech
    // utterance and expects no additional speech. Therefore, the server will
    // not process additional audio (although it may subsequently return
    // additional results). The client should stop sending additional audio
    // data, half-close the gRPC connection, and wait for any additional results
    // until the server closes the gRPC connection. This message is only sent if
    // [`single_utterance`][google.cloud.dialogflow.cx.v3.InputAudioConfig.single_utterance] was set to
    // `true`, and is not used otherwise.
    END_OF_SINGLE_UTTERANCE = 2;
  }

  // Type of the result message.
  MessageType message_type = 1;

  // Transcript text representing the words that the user spoke.
  // Populated if and only if `message_type` = `TRANSCRIPT`.
  string transcript = 2;

  // If `false`, the `StreamingRecognitionResult` represents an
  // interim result that may change. If `true`, the recognizer will not return
  // any further hypotheses about this piece of the audio. May only be populated
  // for `message_type` = `TRANSCRIPT`.
  bool is_final = 3;

  // The Speech confidence between 0.0 and 1.0 for the current portion of audio.
  // A higher number indicates an estimated greater likelihood that the
  // recognized words are correct. The default of 0.0 is a sentinel value
  // indicating that confidence was not set.
  //
  // This field is typically only provided if `is_final` is true and you should
  // not rely on it being accurate or even set.
  float confidence = 4;

  // An estimate of the likelihood that the speech recognizer will
  // not change its guess about this interim recognition result:
  // * If the value is unspecified or 0.0, Dialogflow didn't compute the
  //   stability. In particular, Dialogflow will only provide stability for
  //   `TRANSCRIPT` results with `is_final = false`.
  // * Otherwise, the value is in (0.0, 1.0] where 0.0 means completely
  //   unstable and 1.0 means completely stable.
  float stability = 6;

  // Word-specific information for the words recognized by Speech in
  // [transcript][google.cloud.dialogflow.cx.v3.StreamingRecognitionResult.transcript]. Populated if and only if `message_type` = `TRANSCRIPT` and
  // [InputAudioConfig.enable_word_info] is set.
  repeated SpeechWordInfo speech_word_info = 7;

  // Time offset of the end of this Speech recognition result relative to the
  // beginning of the audio. Only populated for `message_type` =
  // `TRANSCRIPT`.
  google.protobuf.Duration speech_end_offset = 8;
}

// Represents the parameters of a conversational query.
message QueryParameters {
  // The time zone of this conversational query from the [time zone
  // database](https://www.iana.org/time-zones), e.g., America/New_York,
  // Europe/Paris. If not provided, the time zone specified in the agent is
  // used.
  string time_zone = 1;

  // The geo location of this conversational query.
  google.type.LatLng geo_location = 2;

  // Additional session entity types to replace or extend developer entity types
  // with. The entity synonyms apply to all languages and persist for the
  // session of this query.
  repeated SessionEntityType session_entity_types = 3;

  // This field can be used to pass custom data into the webhook associated with
  // the agent. Arbitrary JSON objects are supported.
  google.protobuf.Struct payload = 4;

  // Additional parameters to be put into [session
  // parameters][SessionInfo.parameters]. To remove a
  // parameter from the session, clients should explicitly set the parameter
  // value to null.
  //
  // Depending on your protocol or client library language, this is a
  // map, associative array, symbol table, dictionary, or JSON object
  // composed of a collection of (MapKey, MapValue) pairs:
  //
  // -   MapKey type: string
  // -   MapKey value: parameter name
  // -   MapValue type:
  //     -   If parameter's entity type is a composite entity: map
  //     -   Else: depending on parameter value type, could be one of string,
  //         number, boolean, null, list or map
  // -   MapValue value:
  //     -   If parameter's entity type is a composite entity:
  //         map from composite entity property names to property values
  //     -   Else: parameter value
  google.protobuf.Struct parameters = 5;

  // Whether to disable webhook calls for this request.
  bool disable_webhook = 7;

  // Configures whether sentiment analysis should be performed. If not
  // provided, sentiment analysis is not performed.
  bool analyze_query_text_sentiment = 8;

  // This field can be used to pass HTTP headers for a webhook
  // call. These headers will be sent to webhook along with the headers that
  // have been configured through Dialogflow web console. The headers defined
  // within this field will overwrite the headers configured through Dialogflow
  // console if there is a conflict. Header names are case-insensitive.
  // Google's specified headers are not allowed. Including: "Host",
  // "Content-Length", "Connection", "From", "User-Agent", "Accept-Encoding",
  // "If-Modified-Since", "If-None-Match", "X-Forwarded-For", etc.
  map<string, string> webhook_headers = 10;
}

// Represents the query input. It can contain one of:
//
// 1.  A conversational query in the form of text.
//
// 2.  An intent query that specifies which intent to trigger.
//
// 3.  Natural language speech audio to be processed.
//
// 4.  An event to be triggered.
//
message QueryInput {
  // Required. The input specification.
  oneof input {
    // The natural language text to be processed.
    TextInput text = 2;

    // The intent to be triggered.
    IntentInput intent = 3;

    // The natural language speech audio to be processed.
    AudioInput audio = 5;

    // The event to be triggered.
    EventInput event = 6;

    // The DTMF event to be handled.
    DtmfInput dtmf = 7;
  }

  // Required. The language of the input. See [Language
  // Support](https://cloud.google.com/dialogflow/cx/docs/reference/language)
  // for a list of the currently supported language codes. Note that queries in
  // the same session do not necessarily need to specify the same language.
  string language_code = 4 [(google.api.field_behavior) = REQUIRED];
}

// Represents the result of a conversational query.
message QueryResult {
  // The original conversational query.
  oneof query {
    // If [natural language text][google.cloud.dialogflow.cx.v3.TextInput] was provided as input, this field
    // will contain a copy of the text.
    string text = 1;

    // If an [intent][google.cloud.dialogflow.cx.v3.IntentInput] was provided as input, this field will
    // contain a copy of the intent identifier.
    string trigger_intent = 11;

    // If [natural language speech audio][google.cloud.dialogflow.cx.v3.AudioInput] was provided as input,
    // this field will contain the trascript for the audio.
    string transcript = 12;

    // If an [event][google.cloud.dialogflow.cx.v3.EventInput] was provided as input, this field will contain
    // the name of the event.
    string trigger_event = 14;
  }

  // The language that was triggered during intent detection.
  // See [Language
  // Support](https://cloud.google.com/dialogflow/cx/docs/reference/language)
  // for a list of the currently supported language codes.
  string language_code = 2;

  // The collected [session parameters][google.cloud.dialogflow.cx.v3.SessionInfo.parameters].
  //
  // Depending on your protocol or client library language, this is a
  // map, associative array, symbol table, dictionary, or JSON object
  // composed of a collection of (MapKey, MapValue) pairs:
  //
  // -   MapKey type: string
  // -   MapKey value: parameter name
  // -   MapValue type:
  //     -   If parameter's entity type is a composite entity: map
  //     -   Else: depending on parameter value type, could be one of string,
  //         number, boolean, null, list or map
  // -   MapValue value:
  //     -   If parameter's entity type is a composite entity:
  //         map from composite entity property names to property values
  //     -   Else: parameter value
  google.protobuf.Struct parameters = 3;

  // The list of rich messages returned to the client. Responses vary from
  // simple text messages to more sophisticated, structured payloads used
  // to drive complex logic.
  repeated ResponseMessage response_messages = 4;

  // The list of webhook call status in the order of call sequence.
  repeated google.rpc.Status webhook_statuses = 13;

  // The list of webhook payload in [WebhookResponse.payload][google.cloud.dialogflow.cx.v3.WebhookResponse.payload], in
  // the order of call sequence. If some webhook call fails or doesn't return
  // any payload, an empty `Struct` would be used instead.
  repeated google.protobuf.Struct webhook_payloads = 6;

  // The current [Page][google.cloud.dialogflow.cx.v3.Page]. Some, not all fields are filled in this message,
  // including but not limited to `name` and `display_name`.
  Page current_page = 7;

  // The [Intent][google.cloud.dialogflow.cx.v3.Intent] that matched the conversational query. Some, not all fields
  // are filled in this message, including but not limited to: `name` and
  // `display_name`.
  // This field is deprecated, please use [QueryResult.match][google.cloud.dialogflow.cx.v3.QueryResult.match] instead.
  Intent intent = 8 [deprecated = true];

  // The intent detection confidence. Values range from 0.0 (completely
  // uncertain) to 1.0 (completely certain).
  // This value is for informational purpose only and is only used to
  // help match the best intent within the classification threshold.
  // This value may change for the same end-user expression at any time due to a
  // model retraining or change in implementation.
  // This field is deprecated, please use [QueryResult.match][google.cloud.dialogflow.cx.v3.QueryResult.match] instead.
  float intent_detection_confidence = 9 [deprecated = true];

  // Intent match result, could be an intent or an event.
  Match match = 15;

  // The free-form diagnostic info. For example, this field could contain
  // webhook call latency. The string keys of the Struct's fields map can change
  // without notice.
  google.protobuf.Struct diagnostic_info = 10;

  // The sentiment analyss result, which depends on
  // [`analyze_query_text_sentiment`]
  // [google.cloud.dialogflow.cx.v3.QueryParameters.analyze_query_text_sentiment], specified in the request.
  SentimentAnalysisResult sentiment_analysis_result = 17;
}

// Represents the natural language text to be processed.
message TextInput {
  // Required. The UTF-8 encoded natural language text to be processed. Text length must
  // not exceed 256 characters.
  string text = 1 [(google.api.field_behavior) = REQUIRED];
}

// Represents the intent to trigger programmatically rather than as a result of
// natural language processing.
message IntentInput {
  // Required. The unique identifier of the intent.
  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
  // ID>/intents/<Intent ID>`.
  string intent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Intent"
    }
  ];
}

// Represents the natural speech audio to be processed.
message AudioInput {
  // Required. Instructs the speech recognizer how to process the speech audio.
  InputAudioConfig config = 1 [(google.api.field_behavior) = REQUIRED];

  // The natural language speech audio to be processed.
  // A single request can contain up to 1 minute of speech audio data.
  // The [transcribed text][google.cloud.dialogflow.cx.v3.QueryResult.transcript] cannot contain more than 256
  // bytes.
  //
  // For non-streaming audio detect intent, both `config` and `audio` must be
  // provided.
  // For streaming audio detect intent, `config` must be provided in
  // the first request and `audio` must be provided in all following requests.
  bytes audio = 2;
}

// Represents the event to trigger.
message EventInput {
  // Name of the event.
  string event = 1;
}

// Represents the input for dtmf event.
message DtmfInput {
  // The dtmf digits.
  string digits = 1;

  // The finish digit (if any).
  string finish_digit = 2;
}

// Represents one match result of [MatchIntent][].
message Match {
  // Type of a Match.
  enum MatchType {
    // Not specified. Should never be used.
    MATCH_TYPE_UNSPECIFIED = 0;

    // The query was matched to an intent.
    INTENT = 1;

    // The query directly triggered an intent.
    DIRECT_INTENT = 2;

    // The query was used for parameter filling.
    PARAMETER_FILLING = 3;

    // No match was found for the query.
    NO_MATCH = 4;

    // Indicates an empty query.
    NO_INPUT = 5;

    // The query directly triggered an event.
    EVENT = 6;
  }

  // The [Intent][google.cloud.dialogflow.cx.v3.Intent] that matched the query. Some, not all fields are filled in
  // this message, including but not limited to: `name` and `display_name`. Only
  // filled for [`INTENT`][google.cloud.dialogflow.cx.v3.Match.MatchType] match type.
  Intent intent = 1;

  // The event that matched the query. Only filled for
  // [`EVENT`][google.cloud.dialogflow.cx.v3.Match.MatchType] match type.
  string event = 6;

  // The collection of parameters extracted from the query.
  //
  // Depending on your protocol or client library language, this is a
  // map, associative array, symbol table, dictionary, or JSON object
  // composed of a collection of (MapKey, MapValue) pairs:
  //
  // -   MapKey type: string
  // -   MapKey value: parameter name
  // -   MapValue type:
  //     -   If parameter's entity type is a composite entity: map
  //     -   Else: depending on parameter value type, could be one of string,
  //         number, boolean, null, list or map
  // -   MapValue value:
  //     -   If parameter's entity type is a composite entity:
  //         map from composite entity property names to property values
  //     -   Else: parameter value
  google.protobuf.Struct parameters = 2;

  // Final text input which was matched during MatchIntent. This value can be
  // different from original input sent in request because of spelling
  // correction or other processing.
  string resolved_input = 3;

  // Type of this [Match][google.cloud.dialogflow.cx.v3.Match].
  MatchType match_type = 4;

  // The confidence of this match. Values range from 0.0 (completely uncertain)
  // to 1.0 (completely certain).
  // This value is for informational purpose only and is only used to help match
  // the best intent within the classification threshold. This value may change
  // for the same end-user expression at any time due to a model retraining or
  // change in implementation.
  float confidence = 5;
}

// Request of [MatchIntent][].
message MatchIntentRequest {
  // Required. The name of the session this query is sent to.
  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
  // ID>/sessions/<Session ID>` or `projects/<Project ID>/locations/<Location
  // ID>/agents/<Agent ID>/environments/<Environment ID>/sessions/<Session ID>`.
  // If `Environment ID` is not specified, we assume default 'draft'
  // environment.
  // It's up to the API caller to choose an appropriate `Session ID`. It can be
  // a random number or some type of session identifiers (preferably hashed).
  // The length of the `Session ID` must not exceed 36 characters.
  //
  // For more information, see the [sessions
  // guide](https://cloud.google.com/dialogflow/cx/docs/concept/session).
  string session = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Session"
    }
  ];

  // The parameters of this query.
  QueryParameters query_params = 2;

  // Required. The input specification.
  QueryInput query_input = 3 [(google.api.field_behavior) = REQUIRED];
}

// Response of [MatchIntent][].
message MatchIntentResponse {
  // The original conversational query.
  oneof query {
    // If [natural language text][google.cloud.dialogflow.cx.v3.TextInput] was provided as input, this field
    // will contain a copy of the text.
    string text = 1;

    // If an [intent][google.cloud.dialogflow.cx.v3.IntentInput] was provided as input, this field will
    // contain a copy of the intent identifier.
    string trigger_intent = 2;

    // If [natural language speech audio][google.cloud.dialogflow.cx.v3.AudioInput] was provided as input,
    // this field will contain the trascript for the audio.
    string transcript = 3;

    // If an [event][google.cloud.dialogflow.cx.v3.EventInput] was provided as input, this field will
    // contain a copy of the event name.
    string trigger_event = 6;
  }

  // Match results, if more than one, ordered descendingly by the confidence
  // we have that the particular intent matches the query.
  repeated Match matches = 4;

  // The current [Page][google.cloud.dialogflow.cx.v3.Page]. Some, not all fields are filled in this message,
  // including but not limited to `name` and `display_name`.
  Page current_page = 5;
}

// Request of [FulfillIntent][]
message FulfillIntentRequest {
  // Must be same as the corresponding MatchIntent request, otherwise the
  // behavior is undefined.
  MatchIntentRequest match_intent_request = 1;

  // The matched intent/event to fulfill.
  Match match = 2;

  // Instructs the speech synthesizer how to generate output audio.
  OutputAudioConfig output_audio_config = 3;
}

// Response of [FulfillIntent][]
message FulfillIntentResponse {
  // Output only. The unique identifier of the response. It can be used to
  // locate a response in the training example set or for reporting issues.
  string response_id = 1;

  // The result of the conversational query.
  QueryResult query_result = 2;

  // The audio data bytes encoded as specified in the request.
  // Note: The output audio is generated based on the values of default platform
  // text responses found in the
  // [`query_result.response_messages`][google.cloud.dialogflow.cx.v3.QueryResult.response_messages] field. If
  // multiple default text responses exist, they will be concatenated when
  // generating audio. If no default platform text responses exist, the
  // generated audio content will be empty.
  //
  // In some scenarios, multiple output audio fields may be present in the
  // response structure. In these cases, only the top-most-level audio output
  // has content.
  bytes output_audio = 3;

  // The config used by the speech synthesizer to generate the output audio.
  OutputAudioConfig output_audio_config = 4;
}

// The result of sentiment analysis. Sentiment analysis inspects user input
// and identifies the prevailing subjective opinion, especially to determine a
// user's attitude as positive, negative, or neutral.
message SentimentAnalysisResult {
  // Sentiment score between -1.0 (negative sentiment) and 1.0 (positive
  // sentiment).
  float score = 1;

  // A non-negative number in the [0, +inf) range, which represents the absolute
  // magnitude of sentiment, regardless of score (positive or negative).
  float magnitude = 2;
}