// Copyright 2026 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.ces.v1beta;

import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/struct.proto";
import "google/protobuf/timestamp.proto";

option go_package = "cloud.google.com/go/ces/apiv1beta/cespb;cespb";
option java_multiple_files = true;
option java_outer_classname = "CommonProto";
option java_package = "com.google.cloud.ces.v1beta";
option (google.api.resource_definition) = {
  type: "servicedirectory.googleapis.com/Service"
  pattern: "projects/{project}/locations/{location}/namespaces/{namespace}/services/{service}"
};

// The execution type of the tool or toolset.
enum ExecutionType {
  // The execution type is unspecified. Defaults to `SYNCHRONOUS` if
  // unspecified.
  EXECUTION_TYPE_UNSPECIFIED = 0;

  // The tool is executed synchronously. The session is blocked
  // until the tool returns.
  SYNCHRONOUS = 1;

  // The tool is executed asynchronously. The session will
  // continue while the tool is executing.
  ASYNCHRONOUS = 2;
}

// A callback defines the custom logic to be executed at various stages of
// agent interaction.
message Callback {
  // The callback to execute.
  oneof callback {
    // Required. The python code to execute for the callback.
    string python_code = 1 [(google.api.field_behavior) = REQUIRED];
  }

  // Optional. Human-readable description of the callback.
  string description = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Whether the callback is disabled. Disabled callbacks are ignored
  // by the agent.
  bool disabled = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If enabled, the callback will also be executed on intermediate
  // model outputs. This setting only affects after model callback.
  // **ENABLE WITH CAUTION**. Typically after model callback only needs to be
  // executed after receiving all model responses. Enabling proactive execution
  // may have negative implication on the execution cost and latency, and
  // should only be enabled in rare situations.
  bool proactive_execution_enabled = 4 [(google.api.field_behavior) = OPTIONAL];
}

// Model settings contains various configurations for the LLM model.
message ModelSettings {
  // Optional. The LLM model that the agent should use.
  // If not set, the agent will inherit the model from its parent agent.
  string model = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If set, this temperature will be used for the LLM model.
  // Temperature controls the randomness of the model's responses. Lower
  // temperatures produce responses that are more predictable. Higher
  // temperatures produce responses that are more creative.
  optional double temperature = 2 [(google.api.field_behavior) = OPTIONAL];
}

// Action that is taken when a certain precondition is met.
message TriggerAction {
  // Represents a response from the agent.
  message Response {
    // Required. Text for the agent to respond with.
    string text = 1 [(google.api.field_behavior) = REQUIRED];

    // Optional. Whether the response is disabled. Disabled responses are not
    // used by the agent.
    bool disabled = 2 [(google.api.field_behavior) = OPTIONAL];
  }

  // The agent will immediately respond with a preconfigured response.
  message RespondImmediately {
    // Required. The canned responses for the agent to choose from. The response
    // is chosen randomly.
    repeated Response responses = 1 [(google.api.field_behavior) = REQUIRED];
  }

  // The agent will immediately respond with a generative answer.
  message GenerativeAnswer {
    // Required. The prompt to use for the generative answer.
    string prompt = 1 [(google.api.field_behavior) = REQUIRED];
  }

  // The agent will transfer the conversation to a different agent.
  message TransferAgent {
    // Required. The name of the agent to transfer the conversation to. The
    // agent must be in the same app as the current agent. Format:
    // `projects/{project}/locations/{location}/apps/{app}/agents/{agent}`
    string agent = 1 [
      (google.api.field_behavior) = REQUIRED,
      (google.api.resource_reference) = { type: "ces.googleapis.com/Agent" }
    ];
  }

  // The action to take.
  oneof action {
    // Optional. Immediately respond with a preconfigured response.
    RespondImmediately respond_immediately = 1
        [(google.api.field_behavior) = OPTIONAL];

    // Optional. Transfer the conversation to a different agent.
    TransferAgent transfer_agent = 2 [(google.api.field_behavior) = OPTIONAL];

    // Optional. Respond with a generative answer.
    GenerativeAnswer generative_answer = 3
        [(google.api.field_behavior) = OPTIONAL];
  }
}

// The TLS configuration.
message TlsConfig {
  // The CA certificate.
  message CaCert {
    // Required. The name of the allowed custom CA certificates. This
    // can be used to disambiguate the custom CA certificates.
    string display_name = 1 [(google.api.field_behavior) = REQUIRED];

    // Required. The allowed custom CA certificates (in DER format) for
    // HTTPS verification. This overrides the default SSL trust store. If this
    // is empty or unspecified, CES will use Google's default trust
    // store to verify certificates. N.B. Make sure the HTTPS server
    // certificates are signed with "subject alt name". For instance a
    // certificate can be self-signed using the following command:
    //
    // ```
    //    openssl x509 -req -days 200 -in example.com.csr \
    //      -signkey example.com.key \
    //      -out example.com.crt \
    //      -extfile <(printf "\nsubjectAltName='DNS:www.example.com'")
    // ```
    bytes cert = 2 [(google.api.field_behavior) = REQUIRED];
  }

  // Required. Specifies a list of allowed custom CA certificates for HTTPS
  // verification.
  repeated CaCert ca_certs = 1 [(google.api.field_behavior) = REQUIRED];
}

// Configuration for tools using Service Directory.
message ServiceDirectoryConfig {
  // Required. The name of [Service
  // Directory](https://cloud.google.com/service-directory) service.
  // Format:
  // `projects/{project}/locations/{location}/namespaces/{namespace}/services/{service}`.
  // Location of the service directory must be the same as the location of the
  // app.
  string service = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "servicedirectory.googleapis.com/Service"
    }
  ];
}

// A ChannelProfile configures the agent's behavior for a specific communication
// channel, such as web UI or telephony.
message ChannelProfile {
  // Represents the persona property of a channel.
  message PersonaProperty {
    // The persona of the channel.
    enum Persona {
      // UNKNOWN persona.
      UNKNOWN = 0;

      // The agent keeps the responses concise and to the point
      CONCISE = 1;

      // The agent provides additional context, explanations, and details
      CHATTY = 2;
    }

    // Optional. The persona of the channel.
    Persona persona = 1 [(google.api.field_behavior) = OPTIONAL];
  }

  // Message for configuration for the web widget.
  message WebWidgetConfig {
    // Security settings for the web widget.
    message SecuritySettings {
      // Optional. Indicates whether public access to the web widget is enabled.
      // If `true`, the web widget will be publicly accessible.
      // If `false`, the web widget must be integrated with your own
      // authentication and authorization system to return valid credentials for
      // accessing the CES agent.
      bool enable_public_access = 1 [(google.api.field_behavior) = OPTIONAL];

      // Optional. Indicates whether origin check for the web widget is enabled.
      // If `true`, the web widget will check the origin of the website that
      // loads the web widget and only allow it to be loaded in the same origin
      // or any of the allowed origins.
      bool enable_origin_check = 4 [(google.api.field_behavior) = OPTIONAL];

      // Optional. The origins that are allowed to host the web widget. An
      // origin is defined by RFC 6454. If empty, all origins are allowed. A
      // maximum of 100 origins is allowed. Example: "https://example.com"
      repeated string allowed_origins = 2
          [(google.api.field_behavior) = OPTIONAL];

      // Optional. Indicates whether reCAPTCHA verification for the web widget
      // is enabled.
      bool enable_recaptcha = 3 [(google.api.field_behavior) = OPTIONAL];
    }

    // Modality of the web widget.
    enum Modality {
      // Unknown modality.
      MODALITY_UNSPECIFIED = 0;

      // Widget supports both chat and voice input.
      CHAT_AND_VOICE = 1;

      // Widget supports only voice input.
      VOICE_ONLY = 2;

      // Widget supports only chat input.
      CHAT_ONLY = 3;

      // Widget supports chat, voice, and video input.
      CHAT_VOICE_AND_VIDEO = 4;
    }

    // Theme of the web widget.
    enum Theme {
      // Unknown theme.
      THEME_UNSPECIFIED = 0;

      // Light theme.
      LIGHT = 1;

      // Dark theme.
      DARK = 2;
    }

    // Optional. The modality of the web widget.
    Modality modality = 1 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The theme of the web widget.
    Theme theme = 2 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The title of the web widget.
    string web_widget_title = 3 [(google.api.field_behavior) = OPTIONAL];

    // Optional. The security settings of the web widget.
    SecuritySettings security_settings = 4
        [(google.api.field_behavior) = OPTIONAL];
  }

  // The type of the channel profile.
  enum ChannelType {
    // Unknown channel type.
    UNKNOWN = 0;

    // Web UI channel.
    WEB_UI = 2;

    // API channel.
    API = 3;

    // Twilio channel.
    TWILIO = 4;

    // Google Telephony Platform channel.
    GOOGLE_TELEPHONY_PLATFORM = 5;

    // Contact Center as a Service (CCaaS) channel.
    CONTACT_CENTER_AS_A_SERVICE = 6;

    // Five9 channel.
    FIVE9 = 7;

    // Third party contact center integration channel.
    CONTACT_CENTER_INTEGRATION = 8;
  }

  // Optional. The unique identifier of the channel profile.
  string profile_id = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The type of the channel profile.
  ChannelType channel_type = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The persona property of the channel profile.
  PersonaProperty persona_property = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Whether to disable DTMF (dual-tone multi-frequency).
  bool disable_dtmf = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Whether to disable user barge-in control in the conversation.
  // - **true**: User interruptions are disabled while the agent is speaking.
  // - **false**: The agent retains automatic control over when the user can
  // interrupt.
  bool disable_barge_in_control = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The configuration for the web widget.
  WebWidgetConfig web_widget_config = 7
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. The noise suppression level of the channel profile.
  // Available values are "low", "moderate", "high", "very_high".
  string noise_suppression_level = 8 [(google.api.field_behavior) = OPTIONAL];
}

// A span is a unit of work or a single operation during the request processing.
message Span {
  // Output only. The name of the span.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The start time of the span.
  google.protobuf.Timestamp start_time = 2
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The end time of the span.
  google.protobuf.Timestamp end_time = 3
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The duration of the span.
  google.protobuf.Duration duration = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Key-value attributes associated with the span.
  google.protobuf.Struct attributes = 4
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The child spans that are nested under this span.
  repeated Span child_spans = 5 [(google.api.field_behavior) = OUTPUT_ONLY];
}