EffectManager.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\entity\effect;
 
use pocketmine\color\Color;
use pocketmine\entity\Living;
use pocketmine\event\entity\EntityEffectAddEvent;
use pocketmine\event\entity\EntityEffectRemoveEvent;
use pocketmine\utils\ObjectSet;
use function abs;
use function count;
use function spl_object_id;
 
class EffectManager{
    protected array $effects = [];
 
    protected Color $bubbleColor;
    protected bool $onlyAmbientEffects = false;
 
    protected ObjectSet $effectAddHooks;
    protected ObjectSet $effectRemoveHooks;
 
    public function __construct(
        private Living $entity
    ){
        $this->bubbleColor = new Color(0, 0, 0, 0);
        $this->effectAddHooks = new ObjectSet();
        $this->effectRemoveHooks = new ObjectSet();
    }
 
    public function all() : array{
        return $this->effects;
    }
 
    public function clear() : void{
        foreach($this->effects as $effect){
            $this->remove($effect->getType());
        }
    }
 
    public function remove(Effect $effectType) : void{
        $index = spl_object_id($effectType);
        if(isset($this->effects[$index])){
            $effect = $this->effects[$index];
            $ev = new EntityEffectRemoveEvent($this->entity, $effect);
            $ev->call();
            if($ev->isCancelled()){
                foreach($this->effectAddHooks as $hook){
                    $hook($ev->getEffect(), true);
                }
                return;
            }
 
            unset($this->effects[$index]);
            $effect->getType()->remove($this->entity, $effect);
            foreach($this->effectRemoveHooks as $hook){
                $hook($effect);
            }
 
            $this->recalculateEffectColor();
        }
    }
 
    public function get(Effect $effect) : ?EffectInstance{
        return $this->effects[spl_object_id($effect)] ?? null;
    }
 
    public function has(Effect $effect) : bool{
        return isset($this->effects[spl_object_id($effect)]);
    }
 
    public function add(EffectInstance $effect) : bool{
        $oldEffect = null;
        $cancelled = false;
 
        $index = spl_object_id($effect->getType());
        if(isset($this->effects[$index])){
            $oldEffect = $this->effects[$index];
            if(
                abs($effect->getAmplifier()) < $oldEffect->getAmplifier()
                || (abs($effect->getAmplifier()) === abs($oldEffect->getAmplifier()) && $effect->getDuration() < $oldEffect->getDuration())
            ){
                $cancelled = true;
            }
        }
 
        $ev = new EntityEffectAddEvent($this->entity, $effect, $oldEffect);
        if($cancelled){
            $ev->cancel();
        }
 
        $ev->call();
        if($ev->isCancelled()){
            return false;
        }
 
        if($oldEffect !== null){
            $oldEffect->getType()->remove($this->entity, $oldEffect);
        }
 
        $effect->getType()->add($this->entity, $effect);
        foreach($this->effectAddHooks as $hook){
            $hook($effect, $oldEffect !== null);
        }
 
        $this->effects[$index] = $effect;
 
        $this->recalculateEffectColor();
 
        return true;
    }
 
    protected function recalculateEffectColor() : void{
        $colors = [];
        $ambient = true;
        foreach($this->effects as $effect){
            if($effect->isVisible() && $effect->getType()->hasBubbles()){
                $level = $effect->getEffectLevel();
                $color = $effect->getColor();
                for($i = 0; $i < $level; ++$i){
                    $colors[] = $color;
                }
 
                if(!$effect->isAmbient()){
                    $ambient = false;
                }
            }
        }
 
        if(count($colors) > 0){
            $this->bubbleColor = Color::mix(...$colors);
            $this->onlyAmbientEffects = $ambient;
        }else{
            $this->bubbleColor = new Color(0, 0, 0, 0);
            $this->onlyAmbientEffects = false;
        }
    }
 
    public function getBubbleColor() : Color{
        return $this->bubbleColor;
    }
 
    public function hasOnlyAmbientEffects() : bool{
        return $this->onlyAmbientEffects;
    }
 
    public function tick(int $tickDiff = 1) : bool{
        foreach($this->effects as $instance){
            $type = $instance->getType();
            if($type->canTick($instance)){
                $type->applyEffect($this->entity, $instance);
            }
            $instance->decreaseDuration($tickDiff);
            if($instance->hasExpired()){
                $this->remove($instance->getType());
            }
        }
 
        return count($this->effects) > 0;
    }
 
    public function getEffectAddHooks() : ObjectSet{
        return $this->effectAddHooks;
    }
 
    public function getEffectRemoveHooks() : ObjectSet{
        return $this->effectRemoveHooks;
    }
}