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

namespace DVDoug\BoxPacker;

class DefaultPackedBoxSorter implements PackedBoxSorter
{
    public function compare(PackedBox $boxA, PackedBox $boxB): int
    {
        $choice = $boxB->getItems()->count() <=> $boxA->getItems()->count();

        if ($choice === 0) {
            $choice = $boxB->getVolumeUtilisation() <=> $boxA->getVolumeUtilisation();
        }
        if ($choice === 0) {
            $choice = $boxB->getUsedVolume() <=> $boxA->getUsedVolume();
        }

        return $choice;
    }
}