syntax = "proto3";

package chat;

import "google/protobuf/empty.proto";

message ChatMessage {
  string messageId = 1;
  string fromUserId = 2;
  string toUserId = 3;
  string toRoomId = 4;
  string content = 5;
}

message Room { string name = 1; }

message UserList { repeated User users = 1; }

message RoomList { repeated Room rooms = 1; }

message User {
  string userId = 1;
  string username = 2;
}

// RPC Messages

message ReceiveMsgsRequest { string userId = 1; }

message RoomActionResponse {}

message RoomAction {
  string roomId = 1;
  string userId = 2;
  string action = 3;
}

service Chat {
  // Rooms
  rpc roomAction(RoomAction) returns (google.protobuf.Empty) {}

  // Messages
  rpc sendMsg(ChatMessage) returns (google.protobuf.Empty) {}
  rpc receiveMsgs(ReceiveMsgsRequest) returns (stream ChatMessage) {}

  // List
  rpc listRooms(google.protobuf.Empty) returns (RoomList) {}
  rpc getAllUsers(google.protobuf.Empty) returns (UserList) {}
}