Add tic tac toe DM game

2026-08-11 16:30:28 +00:00 · 2026-03-05 09:05:18 +01:00
parent 972a9ba944
commit 55a85659d3
4 changed files with 496 additions and 0 deletions
--- a/lib/utils/tictactoe_message_parser.dart
+++ b/lib/utils/tictactoe_message_parser.dart
@@ -0,0 +1,163 @@
+enum TicTacToeEventType { start, move }
+
+class TicTacToeEvent {
+  final TicTacToeEventType type;
+  final String gameId;
+  final String playerKey6;
+  final int? cell;
+  final int timestampSec;
+
+  const TicTacToeEvent({
+    required this.type,
+    required this.gameId,
+    required this.playerKey6,
+    this.cell,
+    required this.timestampSec,
+  });
+}
+
+class TicTacToeMessageParser {
+  static const String _prefix = 'TTT1:';
+
+  static bool isTicTacToe(String text) => text.startsWith(_prefix);
+
+  static TicTacToeEvent? tryParse(String text) {
+    if (!isTicTacToe(text)) return null;
+    final body = text.substring(_prefix.length);
+    final parts = body.split(':');
+    if (parts.length < 4) return null;
+
+    final action = parts[0];
+    final gameId = parts[1].toLowerCase();
+    if (!RegExp(r'^[0-9a-f]{8}$').hasMatch(gameId)) return null;
+
+    if (action == 'S' && parts.length == 4) {
+      final starterKey6 = parts[2].toLowerCase();
+      final ts = int.tryParse(parts[3]);
+      if (!RegExp(r'^[0-9a-f]{12}$').hasMatch(starterKey6)) return null;
+      if (ts == null || ts <= 0) return null;
+      return TicTacToeEvent(
+        type: TicTacToeEventType.start,
+        gameId: gameId,
+        playerKey6: starterKey6,
+        timestampSec: ts,
+      );
+    }
+
+    if (action == 'M' && parts.length == 5) {
+      final cell = int.tryParse(parts[2]);
+      final playerKey6 = parts[3].toLowerCase();
+      final ts = int.tryParse(parts[4]);
+      if (cell == null || cell < 0 || cell > 8) return null;
+      if (!RegExp(r'^[0-9a-f]{12}$').hasMatch(playerKey6)) return null;
+      if (ts == null || ts <= 0) return null;
+      return TicTacToeEvent(
+        type: TicTacToeEventType.move,
+        gameId: gameId,
+        playerKey6: playerKey6,
+        cell: cell,
+        timestampSec: ts,
+      );
+    }
+
+    return null;
+  }
+
+  static String encodeStart({
+    required String gameId,
+    required String starterKey6,
+    required int timestampSec,
+  }) {
+    return '$_prefix'
+        'S:${gameId.toLowerCase()}:${starterKey6.toLowerCase()}:$timestampSec';
+  }
+
+  static String encodeMove({
+    required String gameId,
+    required int cell,
+    required String playerKey6,
+    required int timestampSec,
+  }) {
+    return '$_prefix'
+        'M:${gameId.toLowerCase()}:$cell:${playerKey6.toLowerCase()}:$timestampSec';
+  }
+}
+
+class TicTacToeGameState {
+  final String gameId;
+  final String xPlayerKey6;
+  final String oPlayerKey6;
+  final List<String?> board; // 'X' / 'O' / null
+  final String nextSymbol;
+  final String? winnerSymbol;
+
+  const TicTacToeGameState({
+    required this.gameId,
+    required this.xPlayerKey6,
+    required this.oPlayerKey6,
+    required this.board,
+    required this.nextSymbol,
+    this.winnerSymbol,
+  });
+
+  bool get isDraw =>
+      winnerSymbol == null && board.every((cell) => cell != null);
+  bool get isFinished => winnerSymbol != null || isDraw;
+}
+
+TicTacToeGameState buildTicTacToeState({
+  required String gameId,
+  required String xPlayerKey6,
+  required String oPlayerKey6,
+  required List<TicTacToeEvent> events,
+}) {
+  final board = List<String?>.filled(9, null);
+  var next = 'X';
+  String? winner;
+
+  final sorted = [...events]
+    ..sort((a, b) => a.timestampSec.compareTo(b.timestampSec));
+
+  for (final event in sorted) {
+    if (event.type != TicTacToeEventType.move) continue;
+    if (winner != null) break;
+
+    final expectedKey = next == 'X' ? xPlayerKey6 : oPlayerKey6;
+    final cell = event.cell;
+    if (cell == null) continue;
+    if (event.playerKey6 != expectedKey) continue;
+    if (board[cell] != null) continue;
+
+    board[cell] = next;
+    winner = _computeWinner(board);
+    next = next == 'X' ? 'O' : 'X';
+  }
+
+  return TicTacToeGameState(
+    gameId: gameId,
+    xPlayerKey6: xPlayerKey6,
+    oPlayerKey6: oPlayerKey6,
+    board: board,
+    nextSymbol: next,
+    winnerSymbol: winner,
+  );
+}
+
+String? _computeWinner(List<String?> board) {
+  const lines = <List<int>>[
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+  ];
+  for (final line in lines) {
+    final a = board[line[0]];
+    if (a == null) continue;
+    if (a == board[line[1]] && a == board[line[2]]) return a;
+  }
+  return null;
+}