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<?php
/**
 * Box packing (3D bin packing, knapsack problem).
 *
 * @author Doug Wright
 */
declare(strict_types=1);

namespace DVDoug\BoxPacker;

class DefaultBoxSorter implements BoxSorter
{
    public function compare(Box $boxA, Box $boxB): int
    {
        $boxAVolume = $boxA->getInnerWidth() * $boxA->getInnerLength() * $boxA->getInnerDepth();
        $boxBVolume = $boxB->getInnerWidth() * $boxB->getInnerLength() * $boxB->getInnerDepth();

        $volumeDecider = $boxAVolume <=> $boxBVolume; // try smallest box first

        if ($volumeDecider !== 0) {
            return $volumeDecider;
        }

        $emptyWeightDecider = $boxA->getEmptyWeight() <=> $boxB->getEmptyWeight(); // with smallest empty weight
        if ($emptyWeightDecider !== 0) {
            return $emptyWeightDecider;
        }

        // maximum weight capacity as fallback decider
        return ($boxA->getMaxWeight() - $boxA->getEmptyWeight()) <=> ($boxB->getMaxWeight() - $boxB->getEmptyWeight());
    }
}