// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

edition = "2023";

package cast_receiver;

option optimize_for = LITE_RUNTIME;

import "components/cast_receiver/proto/input_capabilities.proto";
import "components/cast_receiver/proto/resolution_info.proto";
import "components/cast_receiver/proto/uid.proto";
import "components/cast_receiver/proto/launch_info.proto";

option java_multiple_files = true;
option java_package = "com.google.pixel.exo.proto";
option java_outer_classname = "ExoBootstrapProto";

// Wrapper message for all Exo bootstrap communication.
message ExoBootstrapMessage {
  // The bootstrap information containing device capabilities.
  ExoBootstrapInfo bootstrap_info = 1;

  // Unique session identifier for the mirroring session.
  int64 session_id = 2;

  // The action to perform during bootstrapping.
  BootstrapAction bootstrap_action = 3;

  // Error information if bootstrapping failed.
  BootstrapError bootstrap_error = 4;
}

// Information about the device's capabilities and resolutions.
message ExoBootstrapInfo {
  // Unique identifier of the device.
  UID uid = 1;

  // List of supported resolutions/capabilities by the device.
  repeated ResolutionInfo resolutions = 2;

  // Supported input simulation capabilities (Touch, Keyboard, Mouse).
  InputCapabilities input_capabilities = 3;
}

// Action message to trigger bootstrap events.
message BootstrapAction {
  // The bootstrap action type.
  enum Action {
    UNKNOWN_ACTION = 0;
    // Start the bootstrap negotiation.
    START_BOOTSTRAP = 1;
  }
  // The action to perform.
  Action action = 1;

  // Information needed to launch the streaming app.
  LaunchInfo launch_info = 2;

  // Version of the bootstrap protocol.
  int32 version = 3;
}

// Error message if bootstrapping fails.
message BootstrapError {
  // The type of bootstrap error.
  enum ErrorType {
    UNKNOWN_ERROR = 0;
    // Failed because there is no CDM (Companion Device Manager) association.
    NO_CDM_ASSOCIATION_ERROR = 1;
  }
  // Detailed debug error message.
  string message = 1;

  // The error type.
  ErrorType error_type = 2;
}