syntax = "proto3";

package neuropacket;

// Neuropacket v1-min - Optional Protobuf Schema
// This schema provides a binary-serializable alternative to JSON.

message Neuropacket {
  string version = 1;
  string packet_id = 2;
  string ts = 3;
  string subject_id = 4;
  Source source = 5;
  Metrics metrics = 6;
  State state = 7;
  Quality quality = 8;
  string calibration_id = 9;
  Privacy privacy = 10;
  Integrity integrity = 11;
}

message Source {
  string device_id = 1;
  string sensor_profile = 2;
}

message Metrics {
  optional double hr_bpm = 1;
  optional double hrv_rmssd_ms = 2;
  optional double eda_uS = 3;
  optional double skin_temp_c = 4;
  optional double resp_bpm = 5;
  optional double spo2_pct = 6;
}

message State {
  double valence = 1;
  double arousal = 2;
  double stress = 3;
  double cognitive_load = 4;
  double resilience = 5;
  double confidence = 6;
}

message Quality {
  double artifact_score = 1;
  bool calibrated = 2;
  repeated string missing = 3;
}

message Privacy {
  string consent_token = 1;
  string retention = 2;
  repeated string scopes = 3;
}

message Integrity {
  string hash = 1;
  string signature = 2;
  string key_id = 3;
}