Enchantment Protection Factor

epf.php

<?php

//source: https://minecraft.gamepedia.com/Armor#Enchantments

//$damage = EntityDamageEvent::getFinalDamage();

const TYPE_HELMET = 0;
const TYPE_CHESTPLATE = 1;
const TYPE_LEGGINGS = 2;
const TYPE_BOOTS = 3;

const EPF_MODIFIERES = [
    Enchantment::TYPE_ARMOR_PROTECTION => 1,
    Enchantment::TYPE_ARMOR_FIRE_PROTECTION => 1,
    Enchantment::TYPE_ARMOR_EXPLOSION_PROTECTION => 1,
    Enchantment::TYPE_ARMOR_PROJECTILE_PROTECTION => 2,
    Enchantment::TYPE_ARMOR_FALL_PROTECTION => 3
];

const EPF_CAUSES = [
    Enchantment::TYPE_ARMOR_PROTECTION => [
        EntityDamageEvent::CAUSE_CONTACT,
        EntityDamageEvent::CAUSE_ENTITY_ATTACK,
        EntityDamageEvent::CAUSE_PROJECTILE,
        EntityDamageEvent::CAUSE_SUFFOCATION,
        EntityDamageEvent::CAUSE_FALL,
        EntityDamageEvent::CAUSE_FIRE,
        EntityDamageEvent::CAUSE_FIRE_TICK,
        EntityDamageEvent::CAUSE_LAVA,
        EntityDamageEvent::CAUSE_DROWNING,
        EntityDamageEvent::CAUSE_BLOCK_EXPLOSION,
        EntityDamageEvent::CAUSE_ENTITY_EXPLOSION,
        EntityDamageEvent::CAUSE_MAGIC
    ],
    Enchantment::TYPE_ARMOR_FIRE_PROTECTION => [
        EntityDamageEvent::CAUSE_FIRE,
        EntityDamageEvent::CAUSE_FIRE_TICK,
        EntityDamageEvent::CAUSE_LAVA
    ],
    Enchantment::TYPE_ARMOR_EXPLOSION_PROTECTION => [
        EntityDamageEvent::CAUSE_BLOCK_EXPLOSION,
        EntityDamageEvent::CAUSE_ENTITY_EXPLOSION
    ],
    Enchantment::TYPE_ARMOR_PROJECTILE_PROTECTION => [
        EntityDamageEvent::CAUSE_PROJECTILE
    ],
    Enchantment::TYPE_ARMOR_FALL_PROTECTION => [
        EntityDamageEvent::CAUSE_FALL
    ]
];

const MODIFIER_EPF = 5;

public function protec(\pocketmine\Player $player, int $cause) : array{
    /** @var Item[] $armor */
    $armor = $player->getInventory()->getArmorContents();
    $epf = [];
    /** @var Item $item */
    foreach($armor as $type => $item){
        if($item->hasEnchantments()){
            /** @var ListTag $en */
            foreach($item->getNamedTag()->ench as $en){
                if(isset(self::EPF_MODIFIERS[$en["id"]]) and in_array($cause, self::EPF_CAUSES)){//if its a protection* enchantment
                    $modifier = self::EPF_MODIFIERS[$en["id"]];
                    if(!isset($epf[$modifier])){
                        $epf[$modifier] = $modifier * $en["lvl"];
                    }else{
                        $epf[$modifier] += $modifier * $en["lvl"];
                    }
                }
            }
        }
    }
    
    foreach ($epf as &$moddedProtection) {
        if ($moddedProtection > 20) {
            $moddedProtection = 20;
        }
    }
    return $epf;
}

/**
 * @param EntityDamageEvent $event
 * @priority HIGH
 * @ignoreCancelled true
 */
public function attac(EntityDamageEvent $event){
    if(
        $event->getCause() === EntityDamageEvent::CAUSE_ENTITY_ATTACK and
        $event->getFinalDamage() < $event->getEntity()->getHealth() and
        $event->getEntity() instanceof Player
    ){
        $damage = $event->getFinalDamage();
        $mods = $this->protec($event->getEntity());
        if(!empty($mods)){
            $cappedEPF = array_sum($mods);
            $damage = $event->getFinalDamage() * (1 - $cappedEPF / 25);
            $event->setDamage($damage, self::MODIFIER_EPF);
        }
    }
}

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