// Copyright 2025 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/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/cloud/dialogflow/v2/audio_config.proto";
import "google/cloud/dialogflow/v2/generator.proto";
import "google/cloud/dialogflow/v2/session.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/struct.proto";
import "google/protobuf/timestamp.proto";
import "google/rpc/status.proto";

option csharp_namespace = "Google.Cloud.Dialogflow.V2";
option go_package = "cloud.google.com/go/dialogflow/apiv2/dialogflowpb;dialogflowpb";
option java_multiple_files = true;
option java_outer_classname = "ParticipantProto";
option java_package = "com.google.cloud.dialogflow.v2";
option objc_class_prefix = "DF";

// Service for managing [Participants][google.cloud.dialogflow.v2.Participant].
service Participants {
  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";

  // Creates a new participant in a conversation.
  rpc CreateParticipant(CreateParticipantRequest) returns (Participant) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/conversations/*}/participants"
      body: "participant"
      additional_bindings {
        post: "/v2/{parent=projects/*/locations/*/conversations/*}/participants"
        body: "participant"
      }
    };
    option (google.api.method_signature) = "parent,participant";
  }

  // Retrieves a conversation participant.
  rpc GetParticipant(GetParticipantRequest) returns (Participant) {
    option (google.api.http) = {
      get: "/v2/{name=projects/*/conversations/*/participants/*}"
      additional_bindings {
        get: "/v2/{name=projects/*/locations/*/conversations/*/participants/*}"
      }
    };
    option (google.api.method_signature) = "name";
  }

  // Returns the list of all participants in the specified conversation.
  rpc ListParticipants(ListParticipantsRequest)
      returns (ListParticipantsResponse) {
    option (google.api.http) = {
      get: "/v2/{parent=projects/*/conversations/*}/participants"
      additional_bindings {
        get: "/v2/{parent=projects/*/locations/*/conversations/*}/participants"
      }
    };
    option (google.api.method_signature) = "parent";
  }

  // Updates the specified participant.
  rpc UpdateParticipant(UpdateParticipantRequest) returns (Participant) {
    option (google.api.http) = {
      patch: "/v2/{participant.name=projects/*/conversations/*/participants/*}"
      body: "participant"
      additional_bindings {
        patch: "/v2/{participant.name=projects/*/locations/*/conversations/*/participants/*}"
        body: "participant"
      }
    };
    option (google.api.method_signature) = "participant,update_mask";
  }

  // Adds a text (chat, for example), or audio (phone recording, for example)
  // message from a participant into the conversation.
  //
  // Note: Always use agent versions for production traffic
  // sent to virtual agents. See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  rpc AnalyzeContent(AnalyzeContentRequest) returns (AnalyzeContentResponse) {
    option (google.api.http) = {
      post: "/v2/{participant=projects/*/conversations/*/participants/*}:analyzeContent"
      body: "*"
      additional_bindings {
        post: "/v2/{participant=projects/*/locations/*/conversations/*/participants/*}:analyzeContent"
        body: "*"
      }
    };
    option (google.api.method_signature) = "participant,text_input";
    option (google.api.method_signature) = "participant,event_input";
    option (google.api.method_signature) = "participant,audio_input";
  }

  // Adds a text (chat, for example), or audio (phone recording, for example)
  // message from a participant into the conversation.
  // Note: This method is only available through the gRPC API (not REST).
  //
  // The top-level message sent to the client by the server is
  // `StreamingAnalyzeContentResponse`. Multiple response messages can be
  // returned in order. The first one or more messages contain the
  // `recognition_result` field. Each result represents a more complete
  // transcript of what the user said. The next message contains the
  // `reply_text` field and potentially the `reply_audio` field. The message can
  // also contain the `automated_agent_reply` field.
  //
  // Note: Always use agent versions for production traffic
  // sent to virtual agents. See [Versions and
  // environments](https://cloud.google.com/dialogflow/es/docs/agents-versions).
  rpc StreamingAnalyzeContent(stream StreamingAnalyzeContentRequest)
      returns (stream StreamingAnalyzeContentResponse) {}

  // Gets suggested articles for a participant based on specific historical
  // messages.
  rpc SuggestArticles(SuggestArticlesRequest)
      returns (SuggestArticlesResponse) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/conversations/*/participants/*}/suggestions:suggestArticles"
      body: "*"
      additional_bindings {
        post: "/v2/{parent=projects/*/locations/*/conversations/*/participants/*}/suggestions:suggestArticles"
        body: "*"
      }
    };
    option (google.api.method_signature) = "parent";
  }

  // Gets suggested faq answers for a participant based on specific historical
  // messages.
  rpc SuggestFaqAnswers(SuggestFaqAnswersRequest)
      returns (SuggestFaqAnswersResponse) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/conversations/*/participants/*}/suggestions:suggestFaqAnswers"
      body: "*"
      additional_bindings {
        post: "/v2/{parent=projects/*/locations/*/conversations/*/participants/*}/suggestions:suggestFaqAnswers"
        body: "*"
      }
    };
    option (google.api.method_signature) = "parent";
  }

  // Gets smart replies for a participant based on specific historical
  // messages.
  rpc SuggestSmartReplies(SuggestSmartRepliesRequest)
      returns (SuggestSmartRepliesResponse) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/conversations/*/participants/*}/suggestions:suggestSmartReplies"
      body: "*"
      additional_bindings {
        post: "/v2/{parent=projects/*/locations/*/conversations/*/participants/*}/suggestions:suggestSmartReplies"
        body: "*"
      }
    };
    option (google.api.method_signature) = "parent";
  }

  // Gets knowledge assist suggestions based on historical messages.
  rpc SuggestKnowledgeAssist(SuggestKnowledgeAssistRequest)
      returns (SuggestKnowledgeAssistResponse) {
    option (google.api.http) = {
      post: "/v2/{parent=projects/*/conversations/*/participants/*}/suggestions:suggestKnowledgeAssist"
      body: "*"
      additional_bindings {
        post: "/v2/{parent=projects/*/locations/*/conversations/*/participants/*}/suggestions:suggestKnowledgeAssist"
        body: "*"
      }
    };
  }
}

// Represents a conversation participant (human agent, virtual agent, end-user).
message Participant {
  option (google.api.resource) = {
    type: "dialogflow.googleapis.com/Participant"
    pattern: "projects/{project}/conversations/{conversation}/participants/{participant}"
    pattern: "projects/{project}/locations/{location}/conversations/{conversation}/participants/{participant}"
  };

  // Enumeration of the roles a participant can play in a conversation.
  enum Role {
    // Participant role not set.
    ROLE_UNSPECIFIED = 0;

    // Participant is a human agent.
    HUMAN_AGENT = 1;

    // Participant is an automated agent, such as a Dialogflow agent.
    AUTOMATED_AGENT = 2;

    // Participant is an end user that has called or chatted with
    // Dialogflow services.
    END_USER = 3;
  }

  // Optional. The unique identifier of this participant.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string name = 1 [(google.api.field_behavior) = OPTIONAL];

  // Immutable. The role this participant plays in the conversation. This field
  // must be set during participant creation and is then immutable.
  Role role = 2 [(google.api.field_behavior) = IMMUTABLE];

  // Optional. Label applied to streams representing this participant in SIPREC
  // XML metadata and SDP. This is used to assign transcriptions from that
  // media stream to this participant. This field can be updated.
  string sip_recording_media_label = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Obfuscated user id that should be associated with the created
  // participant.
  //
  // You can specify a user id as follows:
  //
  // 1. If you set this field in
  //    [CreateParticipantRequest][google.cloud.dialogflow.v2.CreateParticipantRequest.participant]
  //    or
  //    [UpdateParticipantRequest][google.cloud.dialogflow.v2.UpdateParticipantRequest.participant],
  //    Dialogflow adds the obfuscated user id with the participant.
  //
  // 2. If you set this field in
  //    [AnalyzeContent][google.cloud.dialogflow.v2.AnalyzeContentRequest.participant]
  //    or
  //    [StreamingAnalyzeContent][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.participant],
  //    Dialogflow will update
  //    [Participant.obfuscated_external_user_id][google.cloud.dialogflow.v2.Participant.obfuscated_external_user_id].
  //
  // Dialogflow returns an error if you try to add a user id for a
  // non-[END_USER][google.cloud.dialogflow.v2.Participant.Role.END_USER]
  // participant.
  //
  // Dialogflow uses this user id for billing and measurement purposes. For
  // example, Dialogflow determines whether a user in one conversation returned
  // in a later conversation.
  //
  // Note:
  //
  // * Please never pass raw user ids to Dialogflow. Always obfuscate your user
  //   id first.
  // * Dialogflow only accepts a UTF-8 encoded string, e.g., a hex digest of a
  //   hash function like SHA-512.
  // * The length of the user id must be <= 256 characters.
  string obfuscated_external_user_id = 7
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Key-value filters on the metadata of documents returned by
  // article suggestion. If specified, article suggestion only returns suggested
  // documents that match all filters in their
  // [Document.metadata][google.cloud.dialogflow.v2.Document.metadata]. Multiple
  // values for a metadata key should be concatenated by comma. For example,
  // filters to match all documents that have 'US' or 'CA' in their market
  // metadata values and 'agent' in their user metadata values will be
  // ```
  // documents_metadata_filters {
  //   key: "market"
  //   value: "US,CA"
  // }
  // documents_metadata_filters {
  //   key: "user"
  //   value: "agent"
  // }
  // ```
  map<string, string> documents_metadata_filters = 8
      [(google.api.field_behavior) = OPTIONAL];
}

// Represents a message posted into a conversation.
message Message {
  option (google.api.resource) = {
    type: "dialogflow.googleapis.com/Message"
    pattern: "projects/{project}/conversations/{conversation}/messages/{message}"
    pattern: "projects/{project}/locations/{location}/conversations/{conversation}/messages/{message}"
  };

  // Optional. The unique identifier of the message.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string name = 1 [(google.api.field_behavior) = OPTIONAL];

  // Required. The message content.
  string content = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. The message language.
  // This should be a [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt)
  // language tag. Example: "en-US".
  string language_code = 3 [(google.api.field_behavior) = OPTIONAL];

  // Output only. The participant that sends this message.
  string participant = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The role of the participant.
  Participant.Role participant_role = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time when the message was created in Contact Center AI.
  google.protobuf.Timestamp create_time = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The time when the message was sent. For voice messages, this is
  // the time when an utterance started.
  google.protobuf.Timestamp send_time = 9
      [(google.api.field_behavior) = OPTIONAL];

  // Output only. The annotation for the message.
  MessageAnnotation message_annotation = 7
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The sentiment analysis result for the message.
  SentimentAnalysisResult sentiment_analysis = 8
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// The request message for
// [Participants.CreateParticipant][google.cloud.dialogflow.v2.Participants.CreateParticipant].
message CreateParticipantRequest {
  // Required. Resource identifier of the conversation adding the participant.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Required. The participant to create.
  Participant participant = 2 [(google.api.field_behavior) = REQUIRED];
}

// The request message for
// [Participants.GetParticipant][google.cloud.dialogflow.v2.Participants.GetParticipant].
message GetParticipantRequest {
  // Required. The name of the participant. Format:
  // `projects/<Project ID>/locations/<Location ID>/conversations/<Conversation
  // ID>/participants/<Participant ID>`.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];
}

// The request message for
// [Participants.ListParticipants][google.cloud.dialogflow.v2.Participants.ListParticipants].
message ListParticipantsRequest {
  // Required. The conversation to list all participants from.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      child_type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Optional. The maximum number of items to return in a single page. By
  // default 100 and at most 1000.
  int32 page_size = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The next_page_token value returned from a previous list request.
  string page_token = 3 [(google.api.field_behavior) = OPTIONAL];
}

// The response message for
// [Participants.ListParticipants][google.cloud.dialogflow.v2.Participants.ListParticipants].
message ListParticipantsResponse {
  // The list of participants. There is a maximum number of items
  // returned based on the page_size field in the request.
  repeated Participant participants = 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
// [Participants.UpdateParticipant][google.cloud.dialogflow.v2.Participants.UpdateParticipant].
message UpdateParticipantRequest {
  // Required. The participant to update.
  Participant participant = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The mask to specify which fields to update.
  google.protobuf.FieldMask update_mask = 2
      [(google.api.field_behavior) = REQUIRED];
}

// The request message for
// [Participants.AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent].
message AnalyzeContentRequest {
  // Required. The name of the participant this text comes from.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string participant = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Required. The input content.
  oneof input {
    // The natural language text to be processed.
    TextInput text_input = 6;

    // The natural language speech audio to be processed.
    AudioInput audio_input = 7;

    // An input event to send to Dialogflow.
    EventInput event_input = 8;

    // An input representing the selection of a suggestion.
    SuggestionInput suggestion_input = 12;
  }

  // Speech synthesis configuration.
  // The speech synthesis settings for a virtual agent that may be configured
  // for the associated conversation profile are not used when calling
  // AnalyzeContent. If this configuration is not supplied, speech synthesis
  // is disabled.
  OutputAudioConfig reply_audio_config = 5;

  // Parameters for a Dialogflow virtual-agent query.
  QueryParameters query_params = 9;

  // Parameters for a human assist query.
  AssistQueryParameters assist_query_params = 14;

  // Additional parameters to be put into Dialogflow CX session parameters. To
  // remove a parameter from the session, clients should explicitly set the
  // parameter value to null.
  //
  // Note: this field should only be used if you are connecting to a Dialogflow
  // CX agent.
  google.protobuf.Struct cx_parameters = 18;

  // A unique identifier for this request. Restricted to 36 ASCII characters.
  // A random UUID is recommended.
  // This request is only idempotent if a `request_id` is provided.
  string request_id = 11;
}

// The message in the response that indicates the parameters of DTMF.
message DtmfParameters {
  // Indicates whether DTMF input can be handled in the next request.
  bool accepts_dtmf_input = 1;
}

// The response message for
// [Participants.AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent].
message AnalyzeContentResponse {
  // The output text content.
  // This field is set if the automated agent responded with text to show to
  // the user.
  string reply_text = 1;

  // The audio data bytes encoded as specified in the request.
  // This field is set if:
  //
  //  - `reply_audio_config` was specified in the request, or
  //  - The automated agent responded with audio to play to the user. In such
  //    case, `reply_audio.config` contains settings used to synthesize the
  //    speech.
  //
  // 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.
  OutputAudio reply_audio = 2;

  // Only set if a Dialogflow automated agent has responded.
  // Note that in [AutomatedAgentReply.DetectIntentResponse][],
  // [Sessions.DetectIntentResponse.output_audio][]
  // and [Sessions.DetectIntentResponse.output_audio_config][]
  // are always empty, use
  // [reply_audio][google.cloud.dialogflow.v2.AnalyzeContentResponse.reply_audio]
  // instead.
  AutomatedAgentReply automated_agent_reply = 3;

  // Message analyzed by CCAI.
  Message message = 5;

  // The suggestions for most recent human agent. The order is the same as
  // [HumanAgentAssistantConfig.SuggestionConfig.feature_configs][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.SuggestionConfig.feature_configs]
  // of
  // [HumanAgentAssistantConfig.human_agent_suggestion_config][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.human_agent_suggestion_config].
  //
  // Note that any failure of Agent Assist features will not lead to the overall
  // failure of an AnalyzeContent API call. Instead, the features will
  // fail silently with the error field set in the corresponding
  // SuggestionResult.
  repeated SuggestionResult human_agent_suggestion_results = 6;

  // The suggestions for end user. The order is the same as
  // [HumanAgentAssistantConfig.SuggestionConfig.feature_configs][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.SuggestionConfig.feature_configs]
  // of
  // [HumanAgentAssistantConfig.end_user_suggestion_config][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.end_user_suggestion_config].
  //
  // Same as human_agent_suggestion_results, any failure of Agent Assist
  // features will not lead to the overall failure of an AnalyzeContent API
  // call. Instead, the features will fail silently with the error field set in
  // the corresponding SuggestionResult.
  repeated SuggestionResult end_user_suggestion_results = 7;

  // Indicates the parameters of DTMF.
  DtmfParameters dtmf_parameters = 9;
}

// The top-level message sent by the client to the
// [Participants.StreamingAnalyzeContent][google.cloud.dialogflow.v2.Participants.StreamingAnalyzeContent]
// method.
//
// Multiple request messages should be sent in order:
//
// 1.  The first message must contain
//     [participant][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.participant],
//     [config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.config]
//     and optionally
//     [query_params][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.query_params].
//     If you want to receive an audio response, it should also contain
//     [reply_audio_config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.reply_audio_config].
//     The message must not contain
//     [input][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.input].
//
// 2.  If
// [config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.config] in
// the first message
//     was set to
//     [audio_config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.audio_config],
//     all subsequent messages must contain
//     [input_audio][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.input_audio]
//     to continue with Speech recognition. However, note that:
//
//     * Dialogflow will bill you for the audio so far.
//     * Dialogflow discards all Speech recognition results in favor of the
//       text input.
//
//  3. If
//  [StreamingAnalyzeContentRequest.config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.config]
//  in the first message was set
//    to
//    [StreamingAnalyzeContentRequest.text_config][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.text_config],
//    then the second message must contain only
//    [input_text][google.cloud.dialogflow.v2.StreamingAnalyzeContentRequest.input_text].
//    Moreover, you must not send more than two messages.
//
//  After you sent all input, you must half-close or abort the request stream.
message StreamingAnalyzeContentRequest {
  // Required. The name of the participant this text comes from.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string participant = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // The input config.
  oneof config {
    // Instructs the speech recognizer how to process the speech audio.
    InputAudioConfig audio_config = 2;

    // The natural language text to be processed.
    InputTextConfig text_config = 3;
  }

  // Speech synthesis configuration.
  // The speech synthesis settings for a virtual agent that may be configured
  // for the associated conversation profile are not used when calling
  // StreamingAnalyzeContent. If this configuration is not supplied, speech
  // synthesis is disabled.
  OutputAudioConfig reply_audio_config = 4;

  // The input.
  oneof input {
    // The input audio content to be recognized. Must be sent if `audio_config`
    // is set in the first message. The complete audio over all streaming
    // messages must not exceed 1 minute.
    bytes input_audio = 5;

    // The UTF-8 encoded natural language text to be processed. Must be sent if
    // `text_config` is set in the first message. Text length must not exceed
    // 256 bytes for virtual agent interactions. The `input_text` field can be
    // only sent once, and would cancel the speech recognition if any ongoing.
    string input_text = 6;

    // The DTMF digits used to invoke intent and fill in parameter value.
    //
    // This input is ignored if the previous response indicated that DTMF input
    // is not accepted.
    TelephonyDtmfEvents input_dtmf = 9;
  }

  // Parameters for a Dialogflow virtual-agent query.
  QueryParameters query_params = 7;

  // Parameters for a human assist query.
  AssistQueryParameters assist_query_params = 8;

  // Additional parameters to be put into Dialogflow CX session parameters. To
  // remove a parameter from the session, clients should explicitly set the
  // parameter value to null.
  //
  // Note: this field should only be used if you are connecting to a Dialogflow
  // CX agent.
  google.protobuf.Struct cx_parameters = 13;

  // Optional. Enable full bidirectional streaming. You can keep streaming the
  // audio until timeout, and there's no need to half close the stream to get
  // the response.
  //
  // Restrictions:
  //
  // - Timeout: 3 mins.
  // - Audio Encoding: only supports
  // [AudioEncoding.AUDIO_ENCODING_LINEAR_16][google.cloud.dialogflow.v2.AudioEncoding.AUDIO_ENCODING_LINEAR_16]
  // and
  // [AudioEncoding.AUDIO_ENCODING_MULAW][google.cloud.dialogflow.v2.AudioEncoding.AUDIO_ENCODING_MULAW]
  // - Lifecycle: conversation should be in `Assist Stage`, go to
  //   [Conversations.CreateConversation][google.cloud.dialogflow.v2.Conversations.CreateConversation]
  //   for more information.
  //
  // InvalidArgument Error will be returned if the one of restriction checks
  // failed.
  //
  // You can find more details in
  // https://cloud.google.com/agent-assist/docs/extended-streaming
  bool enable_extended_streaming = 11 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Enable partial responses from Dialogflow CX agent. If this flag
  // is not enabled, response stream still contains only one final response even
  // if some `Fulfillment`s in Dialogflow CX agent have been configured to
  // return partial responses.
  bool enable_partial_automated_agent_reply = 12
      [(google.api.field_behavior) = OPTIONAL];

  // If true, `StreamingAnalyzeContentResponse.debugging_info` will get
  // populated.
  bool enable_debugging_info = 19;
}

// The top-level message returned from the `StreamingAnalyzeContent` 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.  In virtual agent stage: if `enable_partial_automated_agent_reply` is
//     true, the following N (currently 1 <= N <= 4) messages
//     contain `automated_agent_reply` and optionally `reply_audio`
//     returned by the virtual agent. The first (N-1)
//     `automated_agent_reply`s will have `automated_agent_reply_type` set to
//     `PARTIAL`. The last `automated_agent_reply` has
//     `automated_agent_reply_type` set to `FINAL`.
//     If `enable_partial_automated_agent_reply` is not enabled, response stream
//     only contains the final reply.
//
//     In human assist stage: the following N (N >= 1) messages contain
//     `human_agent_suggestion_results`, `end_user_suggestion_results` or
//     `message`.
message StreamingAnalyzeContentResponse {
  // The result of speech recognition.
  StreamingRecognitionResult recognition_result = 1;

  // The output text content.
  // This field is set if an automated agent responded with a text for the user.
  string reply_text = 2;

  // The audio data bytes encoded as specified in the request.
  // This field is set if:
  //
  //  - The `reply_audio_config` field is specified in the request.
  //  - The automated agent, which this output comes from, responded with audio.
  //    In such case, the `reply_audio.config` field contains settings used to
  //    synthesize the speech.
  //
  // 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.
  OutputAudio reply_audio = 3;

  // Note that in [AutomatedAgentReply.DetectIntentResponse][],
  // [Sessions.DetectIntentResponse.output_audio][]
  // and [Sessions.DetectIntentResponse.output_audio_config][]
  // are always empty, use
  // [reply_audio][google.cloud.dialogflow.v2.StreamingAnalyzeContentResponse.reply_audio]
  // instead.
  AutomatedAgentReply automated_agent_reply = 4;

  // Message analyzed by CCAI.
  Message message = 6;

  // The suggestions for most recent human agent. The order is the same as
  // [HumanAgentAssistantConfig.SuggestionConfig.feature_configs][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.SuggestionConfig.feature_configs]
  // of
  // [HumanAgentAssistantConfig.human_agent_suggestion_config][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.human_agent_suggestion_config].
  repeated SuggestionResult human_agent_suggestion_results = 7;

  // The suggestions for end user. The order is the same as
  // [HumanAgentAssistantConfig.SuggestionConfig.feature_configs][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.SuggestionConfig.feature_configs]
  // of
  // [HumanAgentAssistantConfig.end_user_suggestion_config][google.cloud.dialogflow.v2.HumanAgentAssistantConfig.end_user_suggestion_config].
  repeated SuggestionResult end_user_suggestion_results = 8;

  // Indicates the parameters of DTMF.
  DtmfParameters dtmf_parameters = 10;

  // Debugging info that would get populated when
  // `StreamingAnalyzeContentRequest.enable_debugging_info` is set to true.
  CloudConversationDebuggingInfo debugging_info = 11;

  // The name of the actual Cloud speech model used for speech recognition.
  string speech_model = 13;
}

// The request message for
// [Participants.SuggestArticles][google.cloud.dialogflow.v2.Participants.SuggestArticles].
message SuggestArticlesRequest {
  // Required. The name of the participant to fetch suggestion for.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Optional. The name of the latest conversation message to compile suggestion
  // for. If empty, it will be the latest message of the conversation.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Message"
    }
  ];

  // Optional. Max number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestArticlesRequest.latest_message]
  // to use as context when compiling the suggestion. By default 20 and at
  // most 50.
  int32 context_size = 3 [(google.api.field_behavior) = OPTIONAL];

  // Parameters for a human assist query.
  AssistQueryParameters assist_query_params = 4;
}

// The response message for
// [Participants.SuggestArticles][google.cloud.dialogflow.v2.Participants.SuggestArticles].
message SuggestArticlesResponse {
  // Articles ordered by score in descending order.
  repeated ArticleAnswer article_answers = 1;

  // The name of the latest conversation message used to compile
  // suggestion for.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2;

  // Number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestArticlesResponse.latest_message]
  // to compile the suggestion. It may be smaller than the
  // [SuggestArticlesRequest.context_size][google.cloud.dialogflow.v2.SuggestArticlesRequest.context_size]
  // field in the request if there aren't that many messages in the
  // conversation.
  int32 context_size = 3;
}

// The request message for
// [Participants.SuggestFaqAnswers][google.cloud.dialogflow.v2.Participants.SuggestFaqAnswers].
message SuggestFaqAnswersRequest {
  // Required. The name of the participant to fetch suggestion for.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Optional. The name of the latest conversation message to compile suggestion
  // for. If empty, it will be the latest message of the conversation.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Message"
    }
  ];

  // Optional. Max number of messages prior to and including
  // [latest_message] to use as context when compiling the
  // suggestion. By default 20 and at most 50.
  int32 context_size = 3 [(google.api.field_behavior) = OPTIONAL];

  // Parameters for a human assist query.
  AssistQueryParameters assist_query_params = 4;
}

// The request message for
// [Participants.SuggestFaqAnswers][google.cloud.dialogflow.v2.Participants.SuggestFaqAnswers].
message SuggestFaqAnswersResponse {
  // Answers extracted from FAQ documents.
  repeated FaqAnswer faq_answers = 1;

  // The name of the latest conversation message used to compile
  // suggestion for.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2;

  // Number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestFaqAnswersResponse.latest_message]
  // to compile the suggestion. It may be smaller than the
  // [SuggestFaqAnswersRequest.context_size][google.cloud.dialogflow.v2.SuggestFaqAnswersRequest.context_size]
  // field in the request if there aren't that many messages in the
  // conversation.
  int32 context_size = 3;
}

// The response message for
// [Conversations.GenerateSuggestions][google.cloud.dialogflow.v2.Conversations.GenerateSuggestions].
message GenerateSuggestionsResponse {
  // A GeneratorSuggestion answer.
  message GeneratorSuggestionAnswer {
    // Suggestion details.
    GeneratorSuggestion generator_suggestion = 1;

    // The name of the generator used to generate this suggestion. Format:
    // `projects/<Project ID>/locations/<Location ID>/generators/<Generator
    // ID>`.
    string source_generator = 2;

    // Answer record that uniquely identifies the suggestion. This can be used
    // to provide suggestion feedback.
    string answer_record = 3 [(google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/AnswerRecord"
    }];
  }

  // The answers generated for the conversation based on context.
  repeated GeneratorSuggestionAnswer generator_suggestion_answers = 1;

  // The name of the latest conversation message used as context for
  // compiling suggestion.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [(google.api.resource_reference) = {
    type: "dialogflow.googleapis.com/Message"
  }];
}

// The request message for
// [Participants.SuggestSmartReplies][google.cloud.dialogflow.v2.Participants.SuggestSmartReplies].
message SuggestSmartRepliesRequest {
  // Required. The name of the participant to fetch suggestion for.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // The current natural language text segment to compile suggestion
  // for. This provides a way for user to get follow up smart reply suggestion
  // after a smart reply selection, without sending a text message.
  TextInput current_text_input = 4;

  // The name of the latest conversation message to compile suggestion
  // for. If empty, it will be the latest message of the conversation.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [(google.api.resource_reference) = {
    type: "dialogflow.googleapis.com/Message"
  }];

  // Max number of messages prior to and including
  // [latest_message] to use as context when compiling the
  // suggestion. By default 20 and at most 50.
  int32 context_size = 3;
}

// The response message for
// [Participants.SuggestSmartReplies][google.cloud.dialogflow.v2.Participants.SuggestSmartReplies].
message SuggestSmartRepliesResponse {
  // Output only. Multiple reply options provided by smart reply service. The
  // order is based on the rank of the model prediction.
  // The maximum number of the returned replies is set in SmartReplyConfig.
  repeated SmartReplyAnswer smart_reply_answers = 1
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The name of the latest conversation message used to compile
  // suggestion for.
  //
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [(google.api.resource_reference) = {
    type: "dialogflow.googleapis.com/Message"
  }];

  // Number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestSmartRepliesResponse.latest_message]
  // to compile the suggestion. It may be smaller than the
  // [SuggestSmartRepliesRequest.context_size][google.cloud.dialogflow.v2.SuggestSmartRepliesRequest.context_size]
  // field in the request if there aren't that many messages in the
  // conversation.
  int32 context_size = 3;
}

// Represents the natural language 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];

  // Required. The natural language speech audio to be processed.
  // A single request can contain up to 2 minutes of speech audio data.
  // The transcribed text cannot contain more than 256 bytes for virtual agent
  // interactions.
  bytes audio = 2 [(google.api.field_behavior) = REQUIRED];
}

// Represents the natural language speech audio to be played to the end user.
message OutputAudio {
  // Instructs the speech synthesizer how to generate the speech
  // audio.
  OutputAudioConfig config = 1;

  // The natural language speech audio.
  bytes audio = 2;
}

// Represents a response from an automated agent.
message AutomatedAgentReply {
  // Represents different automated agent reply types.
  enum AutomatedAgentReplyType {
    // Not specified. This should never happen.
    AUTOMATED_AGENT_REPLY_TYPE_UNSPECIFIED = 0;

    // Partial reply. e.g. Aggregated responses in a `Fulfillment` that enables
    // `return_partial_response` can be returned as partial reply.
    // WARNING: partial reply is not eligible for barge-in.
    PARTIAL = 1;

    // Final reply.
    FINAL = 2;
  }

  // Response of the Dialogflow
  // [Sessions.DetectIntent][google.cloud.dialogflow.v2.Sessions.DetectIntent]
  // call.
  DetectIntentResponse detect_intent_response = 1;

  // AutomatedAgentReply type.
  AutomatedAgentReplyType automated_agent_reply_type = 7;

  // Indicates whether the partial automated agent reply is interruptible when a
  // later reply message arrives. e.g. if the agent specified some music as
  // partial response, it can be cancelled.
  bool allow_cancellation = 8;

  // The unique identifier of the current Dialogflow CX conversation page.
  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
  // ID>/flows/<Flow ID>/pages/<Page ID>`.
  string cx_current_page = 11;
}

// Represents article answer.
message ArticleAnswer {
  // The article title.
  string title = 1;

  // The article URI.
  string uri = 2;

  // Article snippets.
  repeated string snippets = 3;

  // Article match confidence.
  // The system's confidence score that this article is a good match for this
  // conversation, as a value from 0.0 (completely uncertain) to 1.0
  // (completely certain).
  float confidence = 4;

  // A map that contains metadata about the answer and the
  // document from which it originates.
  map<string, string> metadata = 5;

  // The name of answer record, in the format of
  // "projects/<Project ID>/locations/<Location ID>/answerRecords/<Answer Record
  // ID>"
  string answer_record = 6;
}

// Represents answer from "frequently asked questions".
message FaqAnswer {
  // The piece of text from the `source` knowledge base document.
  string answer = 1;

  // The system's confidence score that this Knowledge answer is a good match
  // for this conversational query, range from 0.0 (completely uncertain)
  // to 1.0 (completely certain).
  float confidence = 2;

  // The corresponding FAQ question.
  string question = 3;

  // Indicates which Knowledge Document this answer was extracted
  // from.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/agent/knowledgeBases/<Knowledge Base ID>/documents/<Document ID>`.
  string source = 4;

  // A map that contains metadata about the answer and the
  // document from which it originates.
  map<string, string> metadata = 5;

  // The name of answer record, in the format of
  // "projects/<Project ID>/locations/<Location ID>/answerRecords/<Answer Record
  // ID>"
  string answer_record = 6;
}

// Represents a smart reply answer.
message SmartReplyAnswer {
  // The content of the reply.
  string reply = 1;

  // Smart reply confidence.
  // The system's confidence score that this reply is a good match for
  // this conversation, as a value from 0.0 (completely uncertain) to 1.0
  // (completely certain).
  float confidence = 2;

  // The name of answer record, in the format of
  // "projects/<Project ID>/locations/<Location ID>/answerRecords/<Answer Record
  // ID>"
  string answer_record = 3 [(google.api.resource_reference) = {
    type: "dialogflow.googleapis.com/AnswerRecord"
  }];
}

// Represents an intent suggestion.
message IntentSuggestion {
  // The display name of the intent.
  string display_name = 1;

  // The name of the intent.
  oneof intent {
    // The unique identifier of this
    // [intent][google.cloud.dialogflow.v2.Intent]. Format: `projects/<Project
    // ID>/locations/<Location ID>/agent/intents/<Intent ID>`.
    string intent_v2 = 2;
  }

  // Human readable description for better understanding an intent like its
  // scope, content, result etc. Maximum character limit: 140 characters.
  string description = 5;
}

// Represents a Dialogflow assist answer.
message DialogflowAssistAnswer {
  // Result from DetectIntent for one matched intent.
  oneof result {
    // Result from v2 agent.
    QueryResult query_result = 1;

    // An intent suggestion generated from conversation.
    IntentSuggestion intent_suggestion = 5;
  }

  // The name of answer record, in the format of
  // "projects/<Project ID>/locations/<Location ID>/answerRecords/<Answer Record
  // ID>"
  string answer_record = 2;
}

// One response of different type of suggestion response which is used in
// the response of
// [Participants.AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent]
// and
// [Participants.AnalyzeContent][google.cloud.dialogflow.v2.Participants.AnalyzeContent],
// as well as
// [HumanAgentAssistantEvent][google.cloud.dialogflow.v2.HumanAgentAssistantEvent].
message SuggestionResult {
  // Different type of suggestion response.
  oneof suggestion_response {
    // Error status if the request failed.
    google.rpc.Status error = 1;

    // SuggestArticlesResponse if request is for ARTICLE_SUGGESTION.
    SuggestArticlesResponse suggest_articles_response = 2;

    // SuggestKnowledgeAssistResponse if request is for KNOWLEDGE_ASSIST.
    SuggestKnowledgeAssistResponse suggest_knowledge_assist_response = 8;

    // SuggestFaqAnswersResponse if request is for FAQ_ANSWER.
    SuggestFaqAnswersResponse suggest_faq_answers_response = 3;

    // SuggestSmartRepliesResponse if request is for SMART_REPLY.
    SuggestSmartRepliesResponse suggest_smart_replies_response = 4;

    // Suggestions generated using generators triggered by customer or agent
    // messages.
    GenerateSuggestionsResponse generate_suggestions_response = 9;
  }
}

// Defines the language used in the input text.
message InputTextConfig {
  // Required. The language of this conversational query. See [Language
  // Support](https://cloud.google.com/dialogflow/docs/reference/language)
  // for a list of the currently supported language codes.
  string language_code = 1 [(google.api.field_behavior) = REQUIRED];
}

// Represents a part of a message possibly annotated with an entity. The part
// can be an entity or purely a part of the message between two entities or
// message start/end.
message AnnotatedMessagePart {
  // A part of a message possibly annotated with an entity.
  string text = 1;

  // The [Dialogflow system entity
  // type](https://cloud.google.com/dialogflow/docs/reference/system-entities)
  // of this message part. If this is empty, Dialogflow could not annotate the
  // phrase part with a system entity.
  string entity_type = 2;

  // The [Dialogflow system entity formatted value
  // ](https://cloud.google.com/dialogflow/docs/reference/system-entities) of
  // this message part. For example for a system entity of type
  // `@sys.unit-currency`, this may contain:
  // <pre>
  // {
  //   "amount": 5,
  //   "currency": "USD"
  // }
  // </pre>
  google.protobuf.Value formatted_value = 3;
}

// Represents the result of annotation for the message.
message MessageAnnotation {
  // The collection of annotated message parts ordered by their
  // position in the message. You can recover the annotated message by
  // concatenating [AnnotatedMessagePart.text].
  repeated AnnotatedMessagePart parts = 1;

  // Indicates whether the text message contains entities.
  bool contain_entities = 2;
}

// Represents the selection of a suggestion.
message SuggestionInput {
  // Required. The ID of a suggestion selected by the human agent.
  // The suggestion(s) were generated in a previous call to
  // request Dialogflow assist.
  // The format is:
  // `projects/<Project ID>/locations/<Location ID>/answerRecords/<Answer Record
  // ID>` where <Answer Record ID> is an alphanumeric string.
  string answer_record = 1 [(google.api.field_behavior) = REQUIRED];
}

// Represents the parameters of human assist query.
message AssistQueryParameters {
  // Key-value filters on the metadata of documents returned by article
  // suggestion. If specified, article suggestion only returns suggested
  // documents that match all filters in their
  // [Document.metadata][google.cloud.dialogflow.v2.Document.metadata]. Multiple
  // values for a metadata key should be concatenated by comma. For example,
  // filters to match all documents that have 'US' or 'CA' in their market
  // metadata values and 'agent' in their user metadata values will be
  // ```
  // documents_metadata_filters {
  //   key: "market"
  //   value: "US,CA"
  // }
  // documents_metadata_filters {
  //   key: "user"
  //   value: "agent"
  // }
  // ```
  map<string, string> documents_metadata_filters = 1;
}

// The request message for
// [Participants.SuggestKnowledgeAssist][google.cloud.dialogflow.v2.Participants.SuggestKnowledgeAssist].
message SuggestKnowledgeAssistRequest {
  // Required. The name of the participant to fetch suggestions for.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/participants/<Participant ID>`.
  string parent = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Participant"
    }
  ];

  // Optional. The name of the latest conversation message to compile
  // suggestions for. If empty, it will be the latest message of the
  // conversation. Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = {
      type: "dialogflow.googleapis.com/Message"
    }
  ];

  // Optional. Max number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestKnowledgeAssistRequest.latest_message]
  // to use as context when compiling the suggestion. The context size is by
  // default 100 and at most 100.
  int32 context_size = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The previously suggested query for the given conversation. This
  // helps identify whether the next suggestion we generate is reasonably
  // different from the previous one. This is useful to avoid similar
  // suggestions within the conversation.
  string previous_suggested_query = 4 [(google.api.field_behavior) = OPTIONAL];
}

// The response message for
// [Participants.SuggestKnowledgeAssist][google.cloud.dialogflow.v2.Participants.SuggestKnowledgeAssist].
message SuggestKnowledgeAssistResponse {
  // Output only. Knowledge Assist suggestion.
  KnowledgeAssistAnswer knowledge_assist_answer = 1
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The name of the latest conversation message used to compile suggestion for.
  // Format: `projects/<Project ID>/locations/<Location
  // ID>/conversations/<Conversation ID>/messages/<Message ID>`.
  string latest_message = 2;

  // Number of messages prior to and including
  // [latest_message][google.cloud.dialogflow.v2.SuggestKnowledgeAssistResponse.latest_message]
  // to compile the suggestion. It may be smaller than the
  // [SuggestKnowledgeAssistRequest.context_size][google.cloud.dialogflow.v2.SuggestKnowledgeAssistRequest.context_size]
  // field in the request if there are fewer messages in the conversation.
  int32 context_size = 3;
}

// Represents a Knowledge Assist answer.
message KnowledgeAssistAnswer {
  // Represents a suggested query.
  message SuggestedQuery {
    // Suggested query text.
    string query_text = 1;
  }

  // Represents an answer from Knowledge. Currently supports FAQ and Generative
  // answers.
  message KnowledgeAnswer {
    // Details about source of FAQ answer.
    message FaqSource {
      // The corresponding FAQ question.
      string question = 2;
    }

    // Details about source of Generative answer.
    message GenerativeSource {
      // Snippet Source for a Generative Prediction.
      message Snippet {
        // URI the data is sourced from.
        string uri = 2;

        // Text taken from that URI.
        string text = 3;

        // Title of the document.
        string title = 4;

        // Metadata of the document.
        google.protobuf.Struct metadata = 5;
      }

      // All snippets used for this Generative Prediction, with their source URI
      // and data.
      repeated Snippet snippets = 1;
    }

    // The piece of text from the `source` that answers this suggested query.
    string answer_text = 1;

    // Source of result.
    oneof source {
      // Populated if the prediction came from FAQ.
      FaqSource faq_source = 3;

      // Populated if the prediction was Generative.
      GenerativeSource generative_source = 4;
    }
  }

  // The query suggested based on the context. Suggestion is made only if it
  // is different from the previous suggestion.
  SuggestedQuery suggested_query = 1;

  // The answer generated for the suggested query. Whether or not an answer is
  // generated depends on how confident we are about the generated query.
  KnowledgeAnswer suggested_query_answer = 2;

  // The name of the answer record.
  // Format: `projects/<Project ID>/locations/<location ID>/answer
  // Records/<Answer Record ID>`.
  string answer_record = 3;
}
