2048 bot

2048botter

// Sometimes solves kortaggio's 5x5 variant of 2048: http://kortaggio.github.io/2048/
// Open the javascript console with F12 and copy past this in.
 
// export the game manager into the global namespace
GameManager.prototype.__original_actuate = GameManager.prototype.actuate;
GameManager.prototype.actuate = function() {
  window.gm = this;
  this.__original_actuate();
  GameManager.prototype.actuate = GameManager.prototype.__original_actuate;
};
(function triggerFirstMove(first_move) {
  event_obj = document.createEvent('Events');
  event_obj.initEvent('keydown', true, true);
  event_obj.keyCode = event_obj.which = first_move;
  document.dispatchEvent(event_obj);
})(keycode = 37);
 
 
// instrument actuate to tell us if there was a move
GameManager.prototype.__original_actuate = GameManager.prototype.actuate;
GameManager.prototype.actuate = function() {
  this.__moved = true;
  this.__original_actuate();
}
GameManager.prototype.test_move = function test_move(direction) {
  this.__moved = false;
  this.move(direction);
  return this.__moved;
};
 
(function auto_play() {
 
  var UP = 0,
      RIGHT = 1,
      DOWN = 2,
      LEFT = 3,
      MOVE_TIMEOUT = 40;  // ms
 
  function preference_move(preferences) {
    for(var pref_idx=0; pref_idx < preferences.length; pref_idx++) {
      var move_succeeded = gm.test_move(preferences[pref_idx]);
      if (move_succeeded) {
        break;
      }
    }
  }
 
  (function auto_move() {
    preferences = []
    preferences.push(UP);
    var lefties = 0;
    var righties = 0;
    for (var row=0; row<gm.grid.size; row++) {
      for (var col=0; col<gm.grid.size; col++) {
        var cell = { x: col,
                     y: row };
        if (gm.grid.cellAvailable(cell)) {
          if (col > (gm.grid.size / 2)) {
            righties += 1;
          } else {
            lefties += 1;
          }
        }
      }
    }
    var mixer = Math.random() - 0.5;
    if (righties > lefties + mixer) {
      preferences.push(RIGHT);
      preferences.push(LEFT);
    } else {
      preferences.push(LEFT);
      preferences.push(RIGHT);
    }
    preferences.push(DOWN)
    preference_move(preferences)
 
    setTimeout(auto_move, MOVE_TIMEOUT);
  })();
 
})();