<?php

class Image extends File
{
    public $width;
    public $height;
    public $type;
    public $size;

    public $original_filename;
    public $variants = array();

    protected static $sizes = array();

    /**
     * @param $class string
     * @throws ErrorException
     */
    public static function checkSubClass($class)
    {
        if (is_null($class) || $class == '') {
            throw new ErrorException('Class not defined.');
        }
        if (!class_exists($class)) {
            throw new ErrorException('Class "' . $class . '" not exists.');
        }
        if (get_parent_class($class) != 'Image') {
            throw new ErrorException('Class "' . $class . '" mast be extend of "Image".');
        }
    }

    public function getSizes()
    {
        return static::$sizes;
    }

    public function getVariant($size)
    {
        return parent::getImageVariant($size);
    }

    public function getIsNoEmpty()
    {
        return (bool) $this->size;
    }
}