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<?php
namespace lucidtaz\minimax;
use BadMethodCallException;
use RuntimeException;
class Engine
{
private $objectivePlayer;
private $maxDepth;
public function __construct(Player $objectivePlayer, int $maxDepth = 3)
$this->objectivePlayer = $objectivePlayer;
$this->maxDepth = $maxDepth;
}
/**
* Evaluate possible decisions and take the best one
*/
public function decide(GameState $state): Decision
if (!$state->getNextPlayer()->equals($this->objectivePlayer)) {
throw new BadMethodCallException('It is not this players turn');
$topLevelNode = new DecisionPoint(
$this->objectivePlayer,
$state,
$this->maxDepth,
DecisionWithScore::getBestComparator()
);
$decisionWithScore = $topLevelNode->decide();
if ($decisionWithScore->decision === null) {
throw new RuntimeException('There are no possible moves');
return $decisionWithScore->decision;
LucidTaZ /
minimax
