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    <?php
    /**
     * @type MediaURL
     *
     * makes sure the url
     * is an actual
     * media url before dispatch
     *
     * Where the url can be
     * anchor fixed '@' local
     * or
     * absolute
     */

    namespace Catapult;

    final class MediaURL extends Types {
        public function __construct($media, $name='')
        {
          $this->url = $media;

          if ($name=='') {
              $this->name = preg_replace("/.*\//", "", $this->url);
          } else {
            $this->name = $name;
          }
        }

        /**
         * this is for times we need
         * to check if a media file is
         * an actual media file
         *
         * Note: this does not download
         * the file only checks if the
         * return code is valid
         */
        public function isValid()
        {
          $headers = get_headers($this->url);
          $header = $headers[0]; // the result code
          $type = $headers[sizeof($headers) - 1]; // content type
          $m = array();

          if (preg_match("/\d{3}/", $header, $m)) {

            if (substr($m[0], 0, 1) == "2")
              return true;
          }

          return false;
        }

        public function __toString()
        {
          /**
           * make a new file on catapult when we receive an anchor
           * usage follows:
           *
           * @/storage/my.wav => https://api.catapult.inetwork.com/v1/users/u-xxx/media/my
           */
          if (preg_match("/^@/", $this->url, $m)) {
            $media = new Media;
            $media->create(array(
              "file" => preg_replace("/^@/", "", $this->url),
              "mediaName" => $this->name
             ));
          }

          return $this->url;
        }
    }