syntax = "proto3";

import "nanopb.proto";

package alox;

enum MessageType {
  UNKNOWN = 0;
  ACK = 1;
  ECHO = 2;
  VERSION = 3;
  CLIENT_INFO = 4;
  CLIENT_INPUT = 5;
  ACCEL_DEADZONE = 6;
  ESPNOW_UNICAST_TEST = 7;
  LED_RING = 8;
  OTA_START = 16;
  OTA_PAYLOAD = 17;
  OTA_END = 18;
  OTA_STATUS = 19;
  OTA_START_ESPNOW = 20;
  OTA_SLAVE_PROGRESS = 21;
  FIND_ME = 22;
  RESTART = 23;
  ACCEL_SNAPSHOT = 24;
  ACCEL_STREAM = 25;
}

message UartMessage {
  MessageType type = 1;
  oneof payload {
    Ack ack_payload = 2;
    EchoPayload echo_payload = 3;
    VersionResponse version_response = 4;
    ClientInfoResponse client_info_response = 5;
    ClientInputResponse client_input_response = 6;
    OtaStartPayload ota_start = 7;
    OtaPayload ota_payload = 8;
    OtaEndPayload ota_end = 9;
    OtaStatusPayload ota_status = 10;
    AccelDeadzoneRequest accel_deadzone_request = 11;
    AccelDeadzoneResponse accel_deadzone_response = 12;
    EspNowUnicastTestRequest espnow_unicast_test_request = 13;
    EspNowUnicastTestResponse espnow_unicast_test_response = 14;
    OtaSlaveProgressRequest ota_slave_progress_request = 15;
    OtaSlaveProgressResponse ota_slave_progress_response = 16;
    LedRingProgressRequest led_ring_progress_request = 17;
    LedRingProgressResponse led_ring_progress_response = 18;
    EspNowFindMeRequest espnow_find_me_request = 19;
    EspNowFindMeResponse espnow_find_me_response = 20;
    RestartRequest restart_request = 21;
    RestartResponse restart_response = 22;
    AccelSnapshotRequest accel_snapshot_request = 23;
    AccelSnapshotResponse accel_snapshot_response = 24;
    AccelStreamRequest accel_stream_request = 25;
    AccelStreamResponse accel_stream_response = 26;
  }
}

message Ack {}

message EchoPayload { 
  bytes data = 1; 
}

message VersionResponse {
  uint32 version = 1;
  string git_hash = 2;
  /** Active OTA app partition label, e.g. "ota_0" or "ota_1". */
  string running_partition = 3;
}

message ClientInfo {
  uint32 id = 1;
  bool available = 2;
  bool used = 3;
  bytes mac = 4; 
  uint32 last_ping = 5;
  uint32 last_success_ping = 6;
  uint32 version = 7;
  /** Master: ESP-NOW accel stream enabled for this slave. */
  bool accel_stream_enabled = 8;
}

message ClientInfoResponse { 
  repeated ClientInfo clients = 1; 
}

message ClientInput {
  uint32 id = 1;
  float lage_x = 2;
  float lage_y = 3;
  uint32 bitmask = 4;
}

message ClientInputResponse { 
  repeated ClientInput clients = 1; 
}

// write=false: read deadzone; write=true: apply deadzone (LSB per axis, raw accel units).
// client_id 0 = local BMA456 on this node; >0 = slave id on master; ignored on slave.
// all_clients = true (master only): push deadzone to every registered slave via ESP-NOW.
message AccelDeadzoneRequest {
  bool write = 1;
  uint32 deadzone = 2;
  uint32 client_id = 3;
  bool all_clients = 4;
}

message AccelDeadzoneResponse {
  uint32 deadzone = 1;
  uint32 client_id = 2;
  bool success = 3;
  uint32 slaves_updated = 4;
}

// Host → master: enable/disable slave accel ESP-NOW stream (~16 ms per slave).
// write=false: read; write=true: apply. client_id 0 invalid for write (use >0 or all_clients).
message AccelStreamRequest {
  bool write = 1;
  bool enable = 2;
  uint32 client_id = 3;
  bool all_clients = 4;
}

message AccelStreamResponse {
  bool enabled = 1;
  uint32 client_id = 2;
  bool success = 3;
  uint32 slaves_updated = 4;
}

// Host → master: read cached accel samples from slaves (only while stream enabled).
// client_id 0 = all registered slaves; otherwise one slave.
message AccelSnapshotRequest {
  uint32 client_id = 1;
}

message AccelSample {
  uint32 client_id = 1;
  bool valid = 2;
  sint32 x = 3;
  sint32 y = 4;
  sint32 z = 5;
  /** Milliseconds since last ESP-NOW sample from this slave. */
  uint32 age_ms = 6;
}

message AccelSnapshotResponse {
  repeated AccelSample samples = 1 [(nanopb).max_count = 16];
}

message EspNowUnicastTestRequest {
  uint32 client_id = 1;
  uint32 seq = 2;
}

message EspNowUnicastTestResponse {
  bool success = 1;
  uint32 seq = 2;
}

// Host → device: LED ring display (progress bar, digit, clear, blink, or find-me).
// mode: 0=clear, 1=progress (0–100 %), 2=digit (0–10), 3=blink full ring, 4=find-me (R/G/B ×3 @ full brightness).
message LedRingProgressRequest {
  uint32 mode = 1;
  /** 0–100: fraction of ring LEDs to light (mode=progress) */
  uint32 progress = 2;
  /** 0–10 (mode=digit) */
  uint32 digit = 3;
  uint32 r = 4;
  uint32 g = 5;
  uint32 b = 6;
  /** 0–255 brightness scale; 0 = firmware default (~5 %) */
  uint32 intensity = 7;
  /** Pulse length in ms (mode=blink, default 350) */
  uint32 blink_ms = 8;
  /** Number of pulses (mode=blink, default 1) */
  uint32 blink_count = 9;
}

message LedRingProgressResponse {
  bool success = 1;
  uint32 mode = 2;
  uint32 progress = 3;
  uint32 digit = 4;
}

/** Host → master: find-me on local ring (client_id=0) or ESP-NOW unicast to one slave. */
message EspNowFindMeRequest {
  uint32 client_id = 1;
}

message EspNowFindMeResponse {
  bool success = 1;
  uint32 client_id = 2;
}

/** Host → master: restart local node (client_id=0) or ESP-NOW unicast to one slave. */
message RestartRequest {
  uint32 client_id = 1;
}

message RestartResponse {
  bool success = 1;
  uint32 client_id = 2;
}

// Host → device: begin UART OTA (erase inactive OTA slot; device replies OTA_STATUS).
message OtaStartPayload {
  uint32 total_size = 1;
}

// Host → device: firmware chunk (up to 200 bytes); device buffers 4 KiB before flash write.
message OtaPayload {
  uint32 seq = 1;
  bytes data = 2 [(nanopb).max_size = 200];
}

// Host → device: no more payload; device flushes buffer and finalizes OTA.
message OtaEndPayload {}

// Device → host status (also used as ACK after each 4 KiB written).
// status: 1=preparing, 2=ready, 3=block_ack, 4=success, 5=failed, 6=distributing
message OtaStatusPayload {
  uint32 status = 1;
  uint32 bytes_written = 2;
  uint32 target_slot = 3;
  uint32 error = 4;
}

// Host → master: query ESP-NOW slave OTA progress (client_id 0 = all slaves in session).
message OtaSlaveProgressRequest {
  uint32 client_id = 1;
}

message OtaSlaveProgressEntry {
  uint32 client_id = 1;
  uint32 bytes_written = 2;
  uint32 total_bytes = 3;
  /** 0=idle, 1=preparing, 2=ready, 3=distributing, 4=success, 5=failed */
  uint32 status = 4;
  uint32 error = 5;
}

message OtaSlaveProgressResponse {
  bool active = 1;
  uint32 total_bytes = 2;
  uint32 aggregate_bytes = 3;
  uint32 slave_count = 4;
  repeated OtaSlaveProgressEntry slaves = 5 [(nanopb).max_count = 16];
}