[Protocol] Share tournament messages and report draws explicitly

- TournamentPlayer/TournamentPairing/TournamentSettings move into
  serverinfo_tournament.proto, imported by both the tournament event and
  the tournament game commands, so Command_CreateGame reaches them without
  crossing the command/event boundary
- Command_CreateGame carries the full TournamentSettings instead of a
  duplicate games_per_match field, keeping game creation and mid-game
  changes on one wire representation
- draw results are explicit: Command_ReportMatchResult and
  TournamentPairing gain is_draw, so a report stays distinguishable from
  an unset -1 winner
- pairing match-wins are uint32 like the other game counts

libcockatrice_protocol/libcockatrice/protocol/pb/CMakeLists.txt

@@ -185,6 +185,7 @@ set(PROTO_FILES
     serverinfo_replay_match.proto
     serverinfo_report.proto
     serverinfo_room.proto
+    serverinfo_tournament.proto
     serverinfo_user.proto
     serverinfo_user_alt.proto
     serverinfo_user_session.proto

libcockatrice_protocol/libcockatrice/protocol/pb/command_tournament.proto

@@ -1,6 +1,6 @@
 syntax = "proto2";
 import "game_commands.proto";
-import "event_tournament_state.proto";
+import "serverinfo_tournament.proto";
 
 message Command_ReportMatchResult {
     extend GameCommand {
@@ -8,7 +8,12 @@ message Command_ReportMatchResult {
     }
 
     optional sint32 game_id = 1 [default = -1];
+    // The winning player's ID. A drawn match is reported with is_draw set and
+    // winner_id left unset so a missing report stays distinguishable from a
+    // reported draw via has_winner_id().
     optional sint32 winner_id = 2 [default = -1];
+    // Whether the match ended in a draw; winner_id is meaningless then.
+    optional bool is_draw = 3;
 }
 
 message Command_AdvanceTournament {
@@ -23,4 +28,4 @@ message Command_TournamentSettingsSelect {
     }
 
     optional TournamentSettings settings = 1;
-}
+}

libcockatrice_protocol/libcockatrice/protocol/pb/event_tournament_state.proto

@@ -1,27 +1,6 @@
 syntax = "proto2";
 import "game_event.proto";
-
-message TournamentPlayer {
-    optional sint32 player_id = 1;
-    optional string player_name = 2;
-    optional uint32 wins = 3;
-    optional uint32 losses = 4;
-    optional uint32 draws = 5;
-    optional bool deck_submitted = 6;
-}
-
-message TournamentPairing {
-    optional sint32 player1_id = 1;
-    optional sint32 player2_id = 2 [default = -1];
-    optional sint32 game_id = 3;
-    optional sint32 winner_id = 4 [default = -1];
-    optional sint32 player1_match_wins = 5 [default = 0];
-    optional sint32 player2_match_wins = 6 [default = 0];
-}
-
-message TournamentSettings {
-    optional uint32 games_per_match = 1 [default = 1];
-}
+import "serverinfo_tournament.proto";
 
 message Event_TournamentState {
     extend GameEvent {
@@ -40,4 +19,4 @@ message Event_TournamentState {
     repeated TournamentPlayer players = 4;
     repeated TournamentPairing pairings = 5;
     optional TournamentSettings settings = 6;
-}
+}

libcockatrice_protocol/libcockatrice/protocol/pb/room_commands.proto

@@ -1,4 +1,5 @@
 syntax = "proto2";
+import "serverinfo_tournament.proto";
 message RoomCommand {
     enum RoomCommandType {
         LEAVE_ROOM = 1000;
@@ -70,8 +71,8 @@ message Command_CreateGame {
     // share decklists with all players when selected
     optional bool share_decklists_on_load = 14;
 
-    // number of games per match in tournament mode (e.g. 3 for best of 3)
-    optional uint32 games_per_match = 15 [default = 1];
+    // tournament settings shared by game creation and mid-game changes
+    optional TournamentSettings tournament_settings = 15;
 
     // whether this is a tournament game
     optional bool is_tournament = 16;

libcockatrice_protocol/libcockatrice/protocol/pb/serverinfo_tournament.proto

@@ -0,0 +1,32 @@
+syntax = "proto2";
+
+// Player-entered tournament metadata as shown in the standings and bracket views.
+message TournamentPlayer {
+    optional sint32 player_id = 1;
+    optional string player_name = 2;
+    optional uint32 wins = 3;
+    optional uint32 losses = 4;
+    optional uint32 draws = 5;
+    optional bool deck_submitted = 6;
+}
+
+// A single match pairing within a tournament round.
+message TournamentPairing {
+    optional sint32 player1_id = 1;
+    // -1 when the pairing is a bye.
+    optional sint32 player2_id = 2 [default = -1];
+    optional sint32 game_id = 3;
+    // The winning player's ID, or -1 when the match ended in a draw (is_draw).
+    // An unset field reads back as -1 too; has_winner_id() distinguishes those.
+    optional sint32 winner_id = 4 [default = -1];
+    optional uint32 player1_match_wins = 5;
+    optional uint32 player2_match_wins = 6;
+    // Whether the match ended in a draw; winner_id is meaningless then.
+    optional bool is_draw = 7;
+}
+
+// Settings governing all matches of a tournament.
+message TournamentSettings {
+    // Number of games per match (e.g. 3 for best of 3).
+    optional uint32 games_per_match = 1 [default = 1];
+}