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

namespace DVDoug\BoxPacker;

class DefaultItemSorter implements ItemSorter
{
    public function compare(Item $itemA, Item $itemB): int
    {
        $volumeDecider = $itemB->getWidth() * $itemB->getLength() * $itemB->getDepth() <=> $itemA->getWidth() * $itemA->getLength() * $itemA->getDepth();
        if ($volumeDecider !== 0) {
            return $volumeDecider;
        }
        $weightDecider = $itemB->getWeight() <=> $itemA->getWeight();
        if ($weightDecider !== 0) {
            return $weightDecider;
        }

        return $itemA->getDescription() <=> $itemB->getDescription();
    }
}