syntax = "proto3";

package capo;

// The message types used in capo nanoapp. Some of them are H2C
// (Host-To-CHRE) and others are C2H (CHRE-To-Host). One message type must be
// either H2C or C2H. Each message type can choose to have payload or not.
enum MessageType {
  // Explicitly prevents 0 from being used as a valid message type.
  // Doing so protects from obscure bugs caused by default-initialized values.
  INVALID = 0;

  // Detector configuration related message start from 100.
  // Signal for host to acknowledge the notification.
  // It contains AckNotification payload.
  ACK_NOTIFICATION = 100;

  // Signal to enable the carried position detector for device. No payload.
  ENABLE_DETECTOR = 101;

  // Signal to disable the carried position detector for device. No payload.
  DISABLE_DETECTOR = 102;

  // Signal to request most recent carried position detector state. No payload.
  REQUEST_UPDATE = 103;

  // Signal to force carried position detector to refresh state. No payload.
  FORCE_UPDATE = 104;

  // Configure the detector with desired parameters. ConfigureDetector payload.
  CONFIGURE_DETECTOR = 105;

  // Position Detection related message start from 200.
  // Signal while carried position of device detected.
  // It contains PositionDetected payload.
  POSITION_DETECTED = 200;
}

// Notification Type.
enum NotificationType {
  // Explicitly prevents 0 from being used as a valid notification type.
  // Doing so protects from obscure bugs caused by default-initialized values.
  INVALID_NOTIFICATION = 0;

  // Notification of enabling the carried position detector for device.
  ENABLE_NOTIFICATION = 1;

  // Notification of disabling the carried position detector for device.
  DISABLE_NOTIFICATION = 2;

  // Notification of request update from the carried position detector.
  REQUEST_UPDATE_NOTIFICATION = 3;

  // Notification of force update from the carried position detector.
  FORCE_UPDATE_NOTIFICATION = 4;

  // Notification of configure message.
  CONFIGURE_NOTIFICATION = 5;
}

// This message type used for host to acknowledge the notification.
message AckNotification {
  // Sent a notification type for host to acknowledge.
  NotificationType notification_type = 1;
}

// Position type.
enum PositionType {
  // Explicitly prevents 0 from being used as a valid carried position type.
  // Doing so protects from obscure bugs caused by default-initialized values.
  UNKNOWN = 0;

  // Carried position while device is in motion.
  IN_MOTION = 1;

  // Carried position while device is on table and faces up.
  ON_TABLE_FACE_UP = 2;

  // Carried position while device is on table and faces down.
  ON_TABLE_FACE_DOWN = 3;

  // Carried position while device is stationary in unknown orientation.
  STATIONARY_UNKNOWN = 4;
}

// This message type used to notify host a position was a detected.
message PositionDetected {
  // Sent a position type that is defined in PositionTypes.
  PositionType position_type = 1;
}

// Predefined configurations for detector.
enum ConfigPresetType {
  // Explicitly prevents 0 from being used as a valid type.
  // Doing so protects from obscure bugs caused by default-initialized values.
  CONFIG_PRESET_UNSPECIFIED = 0;

  // Default preset.
  CONFIG_PRESET_DEFAULT = 1;

  // Preset for sticky-stationary behavior.
  CONFIG_PRESET_STICKY_STATIONARY = 2;
}

message ConfigureDetector {
  // Ref: cs/location/lbs/contexthub/nanoapps/motiondetector/motion_detector.h
  message ConfigData {
    // These algo parameters are exposed to enable tuning via server flags.
    // The amount of time that the algorithm's computed stillness confidence
    // must exceed still_confidence_threshold before entering the stationary
    // state. Increasing this value will make the algorithm take longer to
    // transition from the in motion state to the stationary state.
    uint64 still_time_threshold_nanosecond = 1;

    // The amount of time in which the variance should be averaged. Increasing
    // this value will effectively smooth the input data, making the algorithm
    // less likely to transition between states.
    uint32 window_width_nanosecond = 2;

    // The required confidence that the device is in motion before entering the
    // motion state. Valid range is [0.0, 1.0], where 1.0 indicates that the
    // algorithm must be 100% certain that the device is moving before entering
    // the motion state. If the Instant Motion sensor is triggered, this value
    // is ignored and the algorithm is immediately transitioned into the in
    // motion state.
    float motion_confidence_threshold = 3;

    // The required confidence that the device is stationary before entering the
    // stationary state. Valid range is [0.0, 1.0], where 1.0 indicates that the
    // algorithm must be 100% certain that the device is stationary before
    // entering the stationary state.
    float still_confidence_threshold = 4;

    // The variance threshold for the StillnessDetector algorithm. Increasing
    // this value causes the algorithm to be less likely to detect motion.
    float var_threshold = 5;

    // The variance threshold delta for the StillnessDetector algorithm about
    // which the stationary confidence is calculated. Valid range is
    // [0.0, var_threshold].
    float var_threshold_delta = 6;
  }

  oneof type {
    ConfigPresetType preset_type = 1;
    ConfigData config_data = 2;
  }
}