/**
* @param Game $game
* @return array
*/
public function getMove(Game $game)
{
$maximizingPlayerMark = $game->getCurrentPlayerMark();
$minimizingPlayerMark = $game->getOtherPlayerMark();
/*
* Initial revenue has to be worse than in the worse case game scenario
*/
$currentRevenue = -self::MAX_REVENUE * 2;
$currentColumn = null;
$currentRow = null;
$boardState = $game->getBoard();
$emptyFields = $boardState->getEmptyFields();
foreach ($emptyFields as $column => $rows) {
foreach ($rows as $row => $emptyValue) {
$boardState->markField($column, $row, $maximizingPlayerMark);
$newRevenue = $this->calculateMiniMaxRevenue($boardState, $maximizingPlayerMark, true, $minimizingPlayerMark);
$boardState->clearField($column, $row);
if ($newRevenue > $currentRevenue) {
$currentRevenue = $newRevenue;
$currentColumn = $column;
$currentRow = $row;
}
}
}
return [$currentColumn, $currentRow];
}
/**
* @param Game $game
* @return array (column, row)
*/
public function getMove(Game $game)
{
if ($game->hasEmptyBoard()) {
/*
* If the board is empty, instead of calculating the field to mark,
* we select it by random.
*
* We can do this, because it never worsens this game's result for
* the player: a computer player will still draw with another computer
* player, and not lose with a human player.
*
* We want to do this, because it's quicker than calculating the move.
*/
list($column, $row) = $game->getRandomBoardCoordinates();
} else {
list($column, $row) = $this->getMiniMaxMove($game);
}
$this->ioService->printMessage(sprintf("%s %s\n", $column, $row));
return [$column, $row];
}
public function getMove(Game $game)
{
return $game->getRandomBoardCoordinates();
}
/**
* @param Game $game
*/
private function moveCurrentPlayer(Game $game)
{
list($randomCol, $randomRow) = $game->getRandomBoardCoordinates();
$msg = sprintf("%s's [%s] move (e.g. %s %s): ", $game->getCurrentPlayerName(), $game->getCurrentPlayerMark(), $randomCol, $randomRow);
$this->ioService->printMessageLine($msg);
while (true) {
try {
$game->moveCurrentPlayer();
break;
} catch (GameException $e) {
$msg = sprintf("%s, try again: ", $e->getMessage());
$this->ioService->printMessage($msg);
}
}
}
public function __construct(Player $startingPlayer, Player $opposingPlayer, Board $board)
{
parent::__construct($startingPlayer, $opposingPlayer);
$this->board = $board;
}
