<?php
/**
 *
 * This file is part of the Aura project for PHP.
 *
 * @package Aura.Uri
 *
 * @license http://opensource.org/licenses/bsd-license.php BSD
 *
 */
namespace Aura\Uri;

/**
 *
 * Manage the Path
 *
 * @package Aura.Uri
 *
 */
class Path extends \ArrayObject
{
    /**
     *
     * The dot-format extension of the last path element, including the dot
     * (for example, the ".rss" in "feed.rss").
     *
     * @var string
     *
     */
    protected $format;

    /**
     *
     * Returns the path array as a string, including the format.
     *
     * @return string The path string.
     *
     */
    public function __toString()
    {
        $spec = $this->getArrayCopy();
        $path = [];
        
        // encode each path element
        foreach ($spec as $elem) {
            $path[] = rawurlencode($elem);
        }

        // create a string from the encoded elements
        $url = implode('/', $path) . $this->format;

        return !empty( $url ) ? '/' . $url : $url;
    }

    /**
     *
     * Sets the $path array and $format value from a string.
     *
     * This will overwrite any previous values.
     *
     * @param string $path The path string to use; for example,
     * "/foo/bar/baz/dib.gir".  A leading slash will *not* create an empty
     * first element; if the string has a leading slash, it is ignored.
     *
     * @return void
     *
     */
    public function setFromString($path)
    {
        $this->exchangeArray([]);
        $path = explode('/', $path);

        if ($path[0] == '') {
            array_shift($path);
        }

        foreach ($path as $key => $val) {
            $this[$key] = urldecode($val);
        }

        // $key and $val are already at the end
        $this->setFormat(null);
        if ( isset($val) ) {
            // find the last dot in the value
            $pos = strrpos($val, '.');
            if ($pos !== false) {
                // remove from the path and retain as the format
                $this[$key] = substr($val, 0, $pos);
                $this->setFormat(substr($val, $pos));
            }
        }
    }

    /**
     *
     * Set the dot-format; remember to include the leading dot.
     *
     * @param string $format
     *
     * @return void
     *
     */
    public function setFormat($format)
    {
        $this->format = $format;
    }

    /**
     *
     * Get the dot-format extension.
     *
     * @return string
     */
    public function getFormat()
    {
        return $this->format;
    }
}