Games are coming... XOXO. <3

TicTacToe.php

<?php
namespace Games;

use Arcade;
use App\User;
use Games\Models\Game;
use Illuminate\Http\Request;

class TicTacToe extends Cabinet {

  /**
   * Start a new game of TicTacToe
   * @param User $player
   * @param Game $game
   * @param Request $request
   * @return array|Game|void|null
   * @throws \Illuminate\Validation\ValidationException
   */
  public function startGame(User $player, Game $game, Request $request)
  {
    $game->assertCreatedBy($player);
    $game->shufflePlayers();
    $game->getCurrentPlayer()->data->table->set('token', 'X')->save();
    $game->getNextPlayer()->data->table->set('token', 'O')->save();
  }

  /**
   * Player places their token into a position, sometimes resulting in the end of the game
   * @param User $player
   * @param Game $game
   * @param Request $request
   * @return array|Game|void|null
   * @throws \Illuminate\Validation\ValidationException
   */
  public function makeMove(User $player, Game $game, Request $request)
  {
    $data = $this->validate($request, [
      'position' => 'required|in:1,2,3,4,5,6,7,8,9',
    ]);

    $game->assertCurrentPlayer($player);
    $token = $player->data->table->assertNotEmpty('token');
    $game->board->assertEmpty($position = "grid.{$data['position']}");
    $game->board->save($position, $token);

    if ($result = $this->isOver($game)) {
      if ($token === 'C') {
        $game->end($request);
      } else if ($token === $result) {
        $game->end($request, $player);
      } else {
        $game->end($request, $game->getNextPlayer());
      }
    } else {
      $game->movePlayToNextPlayer();
    }
  }

  /**
   * Test the given Game to determine if it's over
   * @param Game $game
   * @return bool|string
   */
  public function isOver(Game $game)
  {
    $state = '';
    for($position=1; $position<=9; $position++) {
      $state .= $game->board["grid.{$position}"] ?: '_';
    }

    // build regular expression for win states:
    $x_wins = "/^(" . implode('|', [
      // horizontal rows:
      "XXX......",
      "...XXX...",
      "......XXX",
      // vertical rows:
      "X..X..X..",
      ".X..X..X.",
      "..X..X..X",
      // diagonals:
      "X...X...X",
      "..X.X.X..",
    ]) . ")$/";

    // create O-version with a simple string replacement
    $o_wins = str_replace('X', 'O', $x_wins);

    if (preg_match($x_wins, $state)) {
      return 'X';
    } else if (preg_match($o_wins, $state)) {
      return 'O';
    } else if (stripos($state, '_') === false) {
      return 'C'; // "cat," the draw-state
    } else {
      return false;
    }
  }
}