battles/classes/Battles/Magic/Healing.php

<?php
// Магия восстановления здоровья
use Battles\Magic\Magic;
use Battles\User;
use Battles\Database\Db;

class Healing extends Magic
{
    private $target;
    private $magicPower;

    /**
     * Магия лечения.
     * @param      $target       - кого лечим.
     * @param      $power        - на сколько лечим.
     * @param null $isPercentage - если включён, считает $power в процентах, иначе, по-умолчанию просто как число.
     */
    public function __construct($target, $power, $isPercentage = null)
    {
        $this->magicPower = $power;
        $this->target = $target;
        if (!$this->isUsable()) {
            return $this->status;
        }
        if ($isPercentage) {
            $healHealthAmount = $this->target->health + $this->target->maxHealth / 100 * $this->magicPower;
        } else {
            $healHealthAmount = $this->target->health + $this->magicPower;
        }
        if ($healHealthAmount > $this->target->maxHealth) {
            $healHealthAmount = $this->target->maxHealth;
        }
        Db::getInstance()->execute('UPDATE users SET health = ? WHERE id = ?', [$healHealthAmount, $this->target->id]);
        $targetName = $this->target->login;
        return "Вы восстановили ${healHealthAmount} здоровья персонажу ${targetName}.";
    }

    /**
     * Проверки на успех.
     * @return bool
     */
    private function isUsable(): bool
    {
        $this->target = $this->target == $_SESSION['uid'] ? User::getInstance() : User::getInstance($this->target);
        return $this->isVisible(User::getInstance(), $this->target) && $this->isNotDead(User::getInstance()) && $this->enoughMana(User::getInstance()) && $this->isSuccess(User::getInstance());
    }
}