syntax = "proto3";

package control.v1;

service Control {
  rpc ControlStream(stream ClientMessage) returns (stream ServerMessage);
}

message ClientMessage {
  oneof msg {
    Hello hello = 1;
    PrintResult result = 2;
    Pong pong = 3;
    PrinterUpdate printers = 4;
  }
}

message ServerMessage {
  oneof msg {
    PrintInstruction print = 1;
    Ping ping = 2;
  }
}

message Hello {
  string client_id = 1;
  string version = 2;
  string hostname = 3;
  repeated PrinterInfo printers = 4;
}

message Ping {
  string nonce = 1;
}

message Pong {
  string nonce = 1;
}

message PrintInstruction {
  string request_id = 1;
  bytes pdf_data = 2;
  PrintParams params = 3;
}

message PrintParams {
  uint32 copies = 1;
  string duplex = 2;        // one_sided, long_edge, short_edge
  string color = 3;         // auto, color, monochrome
  string media = 4;
  string quality = 5;       // draft, normal, high
  string orientation = 6;   // portrait, landscape
  string job_name = 7;
  string printer = 8;
}

message PrintResult {
  string request_id = 1;
  bool ok = 2;
  string printer = 3;
  string message = 4;
  uint32 retries_used = 5;
}

message PrinterUpdate {
  repeated PrinterInfo printers = 1;
}

message PrinterInfo {
  string id = 1;
  string name = 2;
  string host = 3;
  string uri = 4;
  string state = 5;
  bool accepting_jobs = 6;
  bool color_supported = 7;
  uint32 active_jobs = 8;
  uint32 ppm = 9;
  uint32 ppm_color = 10;
  repeated string reasons = 11;
}