Image.php

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<?php

namespace ILIAS\LTI\ToolProvider\Content;

class Image
{
    private ?string $url = null;

    private ?int $width = null;

    private ?int $height = null;

    public function __construct(string $url, int $width = null, int $height = null)
    {
        $this->url = $url;
        $this->height = $height;
        $this->width = $width;
    }

    public function toJsonldObject(): object
    {
        $image = new \stdClass();
        $image->{'@id'} = $this->url;
        if (!is_null($this->width)) {
            $image->width = $this->width;
        }
        if (!is_null($this->height)) {
            $image->height = $this->height;
        }

        return $image;
    }

    public function toJsonObject(): string
    {
        $image = new \stdClass();
        $image->url = $this->url;
        if (!is_null($this->width)) {
            $image->width = $this->width;
        }
        if (!is_null($this->height)) {
            $image->height = $this->height;
        }

        return $image;
    }

    public static function fromJsonObject(object $item): ?Image
    {
        $obj = null;
        $width = null;
        $height = null;
        if (is_object($item)) {
            $url = null;
            foreach (get_object_vars($item) as $name => $value) {
                switch ($name) {
                    case '@id':
                    case 'url':
                        $url = $item->{$name};
                        break;
                    case 'width':
                        $width = $item->width;
                        break;
                    case 'height':
                        $height = $item->height;
                        break;
                }
            }
        } else {
            $url = $item;
        }
        if ($url) {
            $obj = new Image($url, $height, $width);
        }

        return $obj;
    }
}