SnowLayer.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\block;
 
use pocketmine\block\utils\BlockEventHelper;
use pocketmine\block\utils\Fallable;
use pocketmine\block\utils\FallableTrait;
use pocketmine\block\utils\SupportType;
use pocketmine\data\runtime\RuntimeDataDescriber;
use pocketmine\item\Item;
use pocketmine\item\VanillaItems;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\player\Player;
use pocketmine\world\BlockTransaction;
use function floor;
use function max;
 
class SnowLayer extends Flowable implements Fallable{
    use FallableTrait;
 
    public const MIN_LAYERS = 1;
    public const MAX_LAYERS = 8;
 
    protected int $layers = self::MIN_LAYERS;
 
    protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
        $w->boundedIntAuto(self::MIN_LAYERS, self::MAX_LAYERS, $this->layers);
    }
 
    public function getLayers() : int{ return $this->layers; }
 
    public function setLayers(int $layers) : self{
        if($layers < self::MIN_LAYERS || $layers > self::MAX_LAYERS){
            throw new \InvalidArgumentException("Layers must be in range " . self::MIN_LAYERS . " ... " . self::MAX_LAYERS);
        }
        $this->layers = $layers;
        return $this;
    }
 
    public function canBeReplaced() : bool{
        return $this->layers < self::MAX_LAYERS;
    }
 
    protected function recalculateCollisionBoxes() : array{
        //TODO: this zero-height BB is intended to stay in lockstep with a MCPE bug
        return [AxisAlignedBB::one()->trim(Facing::UP, $this->layers >= 4 ? 0.5 : 1)];
    }
 
    public function getSupportType(int $facing) : SupportType{
        if(!$this->canBeReplaced()){
            return SupportType::FULL;
        }
        return SupportType::NONE;
    }
 
    private function canBeSupportedAt(Block $block) : bool{
        return $block->getAdjacentSupportType(Facing::DOWN) === SupportType::FULL;
    }
 
    public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
        if($blockReplace instanceof SnowLayer){
            if($blockReplace->layers >= self::MAX_LAYERS){
                return false;
            }
            $this->layers = $blockReplace->layers + 1;
        }
        if($this->canBeSupportedAt($blockReplace)){
            return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
        }
 
        return false;
    }
 
    public function ticksRandomly() : bool{
        return true;
    }
 
    public function onRandomTick() : void{
        $world = $this->position->getWorld();
        if($world->getBlockLightAt($this->position->x, $this->position->y, $this->position->z) >= 12){
            BlockEventHelper::melt($this, VanillaBlocks::AIR());
        }
    }
 
    public function getDropsForCompatibleTool(Item $item) : array{
        return [
            VanillaItems::SNOWBALL()->setCount(max(1, (int) floor($this->layers / 2)))
        ];
    }
}