syntax = "proto3";

package meshcore.v1;

option go_package = "github.com/corescope/proto/v1";

// ─── Decoded Packet Structure ──────────────────────────────────────────────────
// Returned by POST /api/decode, POST /api/packets, and WS broadcast.
// See firmware source (firmware/docs/packet_format.md) for authoritative format.

// Full decoded result: header + path + payload.
message DecodedResult {
  DecodedHeader header = 1;
  // Transport code bytes (null if not a TRANSPORT route).
  optional DecodedTransportCodes transport_codes = 6 [json_name = "transportCodes"];
  DecodedPath path = 2;
  // Flat decoded payload (type-discriminated by payload.type).
  DecodedFlatPayload payload = 3;
  // Raw hex string of the entire packet.
  optional string raw = 4;
}

// Transport code pair for TRANSPORT-routed packets.
message DecodedTransportCodes {
  repeated int32 codes = 1;
}

// Parsed packet header (first byte).
message DecodedHeader {
  // Route type: 0=DIRECT, 1=FLOOD, 2=reserved, 3=TRANSPORT.
  int32 route_type = 1 [json_name = "routeType"];
  // Human-readable route type name: "DIRECT", "FLOOD", "TRANSPORT".
  optional string route_type_name = 5 [json_name = "routeTypeName"];
  // Payload type: 0=REQ .. 11=CONTROL (see Payload Type Reference).
  int32 payload_type = 2 [json_name = "payloadType"];
  // Payload format version.
  int32 payload_version = 3 [json_name = "payloadVersion"];
  // Human-readable type name: "ADVERT", "GRP_TXT", "TXT_MSG", etc.
  string payload_type_name = 4 [json_name = "payloadTypeName"];
}

// Parsed path field (hop hash prefixes).
message DecodedPath {
  // Hex hop prefixes, e.g. ["a1b2", "c3d4"].
  repeated string hops = 1;
  // Bytes per hop hash (1–3).
  int32 hash_size = 2 [json_name = "hashSize"];
  // Number of hops in path field.
  int32 hash_count = 3 [json_name = "hashCount"];
}

// ─── Flat Payload (used in WS broadcast / decoded result) ──────────────────────
// Node.js returns a flat payload object with a `type` discriminator string.
// All type-specific fields are optional — only the relevant ones are populated.

// Decoded advert flags (from AdvertDataHelpers.h).
message AdvertFlags {
  // Raw flags bitmask value.
  int32 raw = 1;
  // Advert type code.
  int32 type = 2;
  // Supports chat.
  bool chat = 3;
  // Is a repeater.
  bool repeater = 4;
  // Is a room server.
  bool room = 5;
  // Is a sensor.
  bool sensor = 6;
  // Includes GPS coordinates.
  bool has_location = 7 [json_name = "hasLocation"];
  // Includes node name.
  bool has_name = 8 [json_name = "hasName"];
}

// Flat decoded payload — all payload type fields merged, discriminated by `type`.
message DecodedFlatPayload {
  // Payload type name: "ADVERT", "TXT_MSG", "GRP_TXT", etc.
  optional string type = 1;
  // --- ADVERT fields ---
  optional string pub_key = 2 [json_name = "pubKey"];
  optional int64 timestamp = 3;
  optional string timestamp_iso = 4 [json_name = "timestampISO"];
  optional string signature = 5;
  optional AdvertFlags flags = 6;
  optional double lat = 7;
  optional double lon = 8;
  optional string name = 9;
  // --- TXT_MSG / GRP_TXT fields ---
  optional string text = 10;
  optional string sender = 11;
  optional string channel = 12;
  optional int64 sender_timestamp = 13 [json_name = "sender_timestamp"];
}

// ─── Payload Oneof (legacy / typed-discriminated) ──────────────────────────────────

// Type-discriminated decoded payload.
message DecodedPayload {
  oneof payload {
    AdvertPayload advert = 1;
    TxtMsgPayload txt_msg = 2;
    GrpTxtPayload grp_txt = 3;
    AckPayload ack = 4;
    ReqPayload req = 5;
    ResponsePayload response = 6;
    AnonReqPayload anon_req = 7;
    PathPayload path_payload = 8;
    TracePayload trace = 9;
    ControlPayload control = 10;
  }
}

// ─── Individual Payload Types ──────────────────────────────────────────────────
// Field definitions are based on firmware source:
//   firmware/src/helpers/AdvertDataHelpers.h
//   firmware/docs/payloads.md

// ADVERT (payload_type=4) — Node advertisement broadcast.
message AdvertPayload {
  // Advertised node name.
  string name = 1;
  // GPS latitude (null if no fix).
  optional double lat = 2;
  // GPS longitude (null if no fix).
  optional double lon = 3;
  // Advert flags bitmask (see AdvertDataHelpers.h).
  int32 flags = 4;
  // Derived role: "repeater", "room", "companion", "sensor".
  string role = 5;
}

// TXT_MSG (payload_type=2) — Direct text message.
message TxtMsgPayload {
  // Message text content.
  string text = 1;
  // Sender node name.
  string sender = 2;
  // Device-side timestamp (may be unreliable).
  optional int64 sender_timestamp = 3 [json_name = "sender_timestamp"];
}

// GRP_TXT (payload_type=5) — Group/channel text message.
message GrpTxtPayload {
  // Message text content.
  string text = 1;
  // Sender node name.
  string sender = 2;
  // Channel name or hash.
  string channel = 3;
  // Device-side timestamp (may be unreliable).
  optional int64 sender_timestamp = 4 [json_name = "sender_timestamp"];
}

// ACK (payload_type=3) — Acknowledgement.
message AckPayload {
  // Raw acknowledgement data.
  bytes ack_data = 1 [json_name = "ack_data"];
}

// REQ (payload_type=0) — Request.
message ReqPayload {
  // Request sub-type identifier.
  int32 request_type = 1 [json_name = "request_type"];
  // Raw request payload bytes.
  bytes request_data = 2 [json_name = "request_data"];
}

// RESPONSE (payload_type=1) — Response to a request.
message ResponsePayload {
  // Response sub-type identifier.
  int32 response_type = 1 [json_name = "response_type"];
  // Raw response payload bytes.
  bytes response_data = 2 [json_name = "response_data"];
}

// ANON_REQ (payload_type=7) — Anonymous request.
message AnonReqPayload {
  // Request sub-type identifier.
  int32 request_type = 1 [json_name = "request_type"];
  // Raw request payload bytes.
  bytes request_data = 2 [json_name = "request_data"];
}

// PATH (payload_type=8) — Path / traceroute.
message PathPayload {
  // Hop prefixes in the path.
  repeated string hops = 1;
}

// TRACE (payload_type=9) — Trace response.
message TracePayload {
  // Hop prefixes in the trace.
  repeated string hops = 1;
}

// CONTROL (payload_type=11) — Control message.
message ControlPayload {
  // Control sub-type identifier.
  int32 control_type = 1 [json_name = "control_type"];
  // Raw control payload bytes.
  bytes control_data = 2 [json_name = "control_data"];
}