/**
* @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
* @throws GameServiceException
*/
private function checkPlayerGameMarks(Game $game)
{
if (null === $game->getCurrentPlayerMark() || null === $game->getOtherPlayerMark()) {
throw new GameServiceException("Player doesn't have a game mark specified");
}
}
public function test_it_returns_opposing_player_mark_for_new_game_when_retrieving_other_player_mark()
{
$this->assertEquals(self::OPPOSING_MARK, $this->game->getOtherPlayerMark());
}
