// NORMATIVE schema for the Skald Relay v2 transport.
// Mirror copy of data/iOS-app/v2/relay-protocol.md §2.
// Do NOT edit field numbers / names — clients and servers depend on byte
// compatibility.

syntax = "proto3";

package skald.relay.v2;

message RelayFrame {
  oneof frame {
    Challenge       challenge        = 1;
    Auth            auth             = 2;
    AuthOk          auth_ok          = 3;
    AuthError       auth_error       = 4;
    Authorize       authorize        = 5;
    AuthorizeOk     authorize_ok     = 6;
    PairingStart    pairing_start    = 7;
    PairingReady    pairing_ready    = 8;
    PairingStop     pairing_stop     = 9;
    PairingStopOk   pairing_stop_ok  = 10;
    ClientPaired    client_paired    = 11;
    Message         message          = 12;
    PeerOffline     peer_offline     = 13;
    PresenceRequest presence_request = 14;
    PresenceList    presence_list    = 15;
    PresenceEvent   presence_event   = 16;
    Error           error            = 17;
  }
  reserved 18, 19;
}

message Message {
  bytes ciphertext = 1;
  bytes nonce      = 2;
  bytes peer       = 3;
  bool  live       = 4;
}
message PeerOffline { bytes peer = 1; }

message PresenceRequest {}
message PresenceList  { repeated bytes online = 1; }
message PresenceEvent { bytes pubkey = 1; Status status = 2; }
enum Status { STATUS_UNSPECIFIED = 0; STATUS_ONLINE = 1; STATUS_OFFLINE = 2; }

message Challenge { bytes nonce = 1; }

message Auth {
  oneof role {
    AuthAgent   agent   = 1;
    AuthClient  client  = 2;
    AuthPairing pairing = 3;
  }
  bytes signature = 4;
}
message AuthAgent  { bytes agent_ed25519_pub = 1; }
message AuthClient {
  bytes    namespace_id       = 1;
  bytes    client_ed25519_pub = 2;
  string   device_token       = 3;
  Platform platform           = 4;
}
message AuthPairing {
  bytes    namespace_id       = 1;
  bytes    client_ed25519_pub = 2;
  bytes    client_x25519_pub  = 3;
  bytes    pairing_token      = 4;
  string   device_token       = 5;
  Platform platform           = 6;
}
enum Platform { PLATFORM_UNSPECIFIED = 0; PLATFORM_IOS = 1; PLATFORM_ANDROID = 2; }

message AuthOk    { bytes namespace_id = 1; }
message AuthError { string code = 1; string message = 2; }
message Authorize   { repeated bytes clients = 1; }
message AuthorizeOk { uint32 authorized = 1; }
message PairingStart  { bytes pairing_token = 1; uint32 ttl = 2; }
message PairingReady  { uint32 ttl = 1; }
message PairingStop   {}
message PairingStopOk {}
message ClientPaired  { bytes client_ed25519_pub = 1; bytes client_x25519_pub = 2; Platform platform = 3; }
message Error { string code = 1; string message = 2; }