class AbstractUriElement

abstract class AbstractUriElement {
    protected \DOMElement $node;
    protected ?string $method;
    
    /**
     * @param \DOMElement $node       A \DOMElement instance
     * @param string|null $currentUri The URI of the page where the link is embedded (or the base href)
     * @param string|null $method     The method to use for the link (GET by default)
     *
     * @throws \InvalidArgumentException if the node is not a link
     */
    public function __construct(\DOMElement $node, ?string $currentUri = null, ?string $method = 'GET') {
        $this->setNode($node);
        $this->method = $method ? strtoupper($method) : null;
        $elementUriIsRelative = !parse_url(trim($this->getRawUri()), \PHP_URL_SCHEME);
        $baseUriIsAbsolute = null !== $this->currentUri && \in_array(strtolower(substr($this->currentUri, 0, 4)), [
            'http',
            'file',
        ]);
        if ($elementUriIsRelative && !$baseUriIsAbsolute) {
            throw new \InvalidArgumentException(\sprintf('The URL of the element is relative, so you must define its base URI passing an absolute URL to the constructor of the "%s" class ("%s" was passed).', __CLASS__, $this->currentUri));
        }
    }
    
    /**
     * Gets the node associated with this link.
     */
    public function getNode() : \DOMElement {
        return $this->node;
    }
    
    /**
     * Gets the method associated with this link.
     */
    public function getMethod() : string {
        return $this->method ?? 'GET';
    }
    
    /**
     * Gets the URI associated with this link.
     */
    public function getUri() : string {
        return UriResolver::resolve($this->getRawUri(), $this->currentUri);
    }
    
    /**
     * Returns raw URI data.
     */
    protected abstract function getRawUri() : string;
    
    /**
     * Returns the canonicalized URI path (see RFC 3986, section 5.2.4).
     *
     * @param string $path URI path
     */
    protected function canonicalizePath(string $path) : string {
        if ('' === $path || '/' === $path) {
            return $path;
        }
        if (str_ends_with($path, '.')) {
            $path .= '/';
        }
        $output = [];
        foreach (explode('/', $path) as $segment) {
            if ('..' === $segment) {
                array_pop($output);
            }
            elseif ('.' !== $segment) {
                $output[] = $segment;
            }
        }
        return implode('/', $output);
    }
    
    /**
     * Sets current \DOMElement instance.
     *
     * @param \DOMElement $node A \DOMElement instance
     *
     * @throws \LogicException If given node is not an anchor
     */
    protected abstract function setNode(\DOMElement $node) : void;

}