<?php
/** DomFramework
    @package domframework
    @author Dominique Fournier <dominique@fournier38.fr> */

require_once ("domframework/verify.php");
require_once ("domframework/convert.php");

/** Create the RSS pages for the websites
  * Specification http://www.rssboard.org/rss-specification
  */
class rss
{
  /** The title of the site (MANDATORY)
    */
  private $title;

  /** The link (URL) to the site (MANDATORY)
    */
  private $link;

  /** The Description of the site (MANDATORY)
    */
  private $description;

  /** The language of the feed
    */
  private $language;

  /** The lastBuildDate
    */
  private $lastBuildDate;

  /** The items linked to this RSS
    */
  private $items = array ();

  /** Get/Set the value
    * @param string|null $title The title to get/set
    */
  public function title ($title = null)
  {
    if ($title === null)
      return $this->title;
    if (! is_string ($title))
      throw new \Exception ("Title provided to RSS is not a string", 500);
    if ($title === "")
      $title = null;
    $this->title = $title;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $link The link to get/set
    */
  public function link ($link = null)
  {
    if ($link === null)
      return $this->link;
    if (! is_string ($link))
      throw new \Exception ("Link provided to RSS is not a string", 500);
    $verify = new \verify ();
    if (! $verify->is_URL ($link))
      throw new \Exception ("Link provided to RSS is not an URL", 500);
    if ($link === "")
      $link = null;
    $this->link = $link;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $description The description to get/set
    */
  public function description ($description = null)
  {
    if ($description === null)
      return $this->description;
    if (! is_string ($description))
      throw new \Exception ("Description provided to RSS is not a string", 500);
    if ($description === "")
      $description = null;
    $this->description = $description;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $language The language to get/set
    */
  public function language ($language = null)
  {
    if ($language === null)
      return $this->language;
    if (! is_string ($language))
      throw new \Exception ("Language provided to RSS is not a string", 500);
    if (! in_array ($language,
        array ("af", "sq", "eu", "be", "bg", "ca", "zh-cn", "zh-tw", "hr", "cs",
               "da", "nl", "nl-be", "nl-nl", "en", "en-au", "en-bz", "en-ca",
               "en-ie", "en-jm", "en-nz", "en-ph", "en-za", "en-tt", "en-gb",
               "en-us", "en-zw", "et", "fo", "fi", "fr", "fr-be", "fr-ca",
               "fr-fr", "fr-lu", "fr-mc", "fr-ch", "gl", "gd", "de", "de-at",
               "de-de", "de-li", "de-lu", "de-ch", "el", "haw", "hu", "is",
               "in", "ga", "it", "it-it", "it-ch", "ja", "ko", "mk", "no", "pl",
               "pt", "pt-br", "pt-pt", "ro", "ro-mo", "ro-ro", "ru", "ru-mo",
               "ru-ru", "sr", "sk", "sl", "es", "es-ar", "es-bo", "es-cl",
               "es-co", "es-cr", "es-do", "es-ec", "es-sv", "es-gt", "es-hn",
               "es-mx", "es-ni", "es-pa", "es-py", "es-pe", "es-pr", "es-es",
               "es-uy", "es-ve", "sv", "sv-fi", "sv-se", "tr", "uk")))
      throw new \Exception ("Provided language for RSS is not allowed", 500);
    if ($language === "")
      $language = null;
    $this->language = $language;
    return $this;
  }

  /** Get/Set the value
    * The date must be in the SQL format Y-m-d H:i:s
    * @param string|null $lastBuildDate The lastBuildDate to get/set
    */
  public function lastBuildDate ($lastBuildDate = null)
  {
    if ($lastBuildDate === null)
      return $this->lastBuildDate;
    if (! is_string ($lastBuildDate))
      throw new \Exception ("lastBuildDate provided to RSS is not a string",
                            500);
    $verify = new \verify ();
    if (! $verify->is_datetimeSQL ($lastBuildDate))
      throw new \Exception ("lastBuildDate provided to RSS is not a valid date",
                            500);
    if ($lastBuildDate === "")
      $lastBuildDate = null;
    else
      $lastBuildDate = \convert::convertDate ($lastBuildDate, "Y-m-d H:i:s",
                                              \DateTime::RFC2822);
    $this->lastBuildDate = $lastBuildDate;
    return $this;
  }

  /** Add a new item to the RSS
    * Return the new rss object created
    */
  public function addItem ()
  {
    $rss_item = new \rss_item ();
    $this->items[] = $rss_item;
    return $rss_item;
  }

  /** Return the complete RSS in XML format
    * Throw an exception if there is some mandatory fields missing
    */
  public function asXML ()
  {
    if ($this->title === null)
      throw new \Exception ("No title is provided for this RSS", 500);
    if ($this->link === null)
      throw new \Exception ("No link is provided for this RSS", 500);
    if ($this->description === null)
      throw new \Exception ("No description is provided for this RSS", 500);
    $xmlstr =
      '<?xml version="1.0"'.'?'.'>'."\n".
      '<rss version="2.0">'."\n".
      '  <channel>'."\n".
      '  </channel>'."\n".
      '</rss>';
    $xml = new \SimpleXMLElement ($xmlstr);
    $xml->channel->title = $this->title;
    $xml->channel->link = $this->link;
    $xml->channel->description = $this->description;
    if ($this->language !== null)
      $xml->channel->language = $this->language;
    if ($this->lastBuildDate !== null)
      $xml->channel->lastBuildDate = $this->lastBuildDate;
    foreach ($this->items as $item)
    {
      if ($item->title() === null && $item->description() === null)
        throw new \Exception (
          "No title nor description defined in the RSS item", 500);
      $tmpItem = $xml->channel->addChild ("item");
      if ($item->title () !== null)
        $tmpItem->title = $item->title ();
      if ($item->link () !== null)
        $tmpItem->link = $item->link ();
      if ($item->description () !== null)
        $tmpItem->description = $item->description ();
      if ($item->author () !== null)
        $tmpItem->author = $item->author ();
      if ($item->comments () !== null)
        $tmpItem->comments = $item->comments ();
      if ($item->guid () !== null)
        $tmpItem->guid = $item->guid ();
      if ($item->pubDate () !== null)
        $tmpItem->pubDate = $item->pubDate ();
    }
    // Ident correctely the xml created in SimpleXML
    $dom = new DOMDocument('1.0');
    $dom->preserveWhiteSpace = false;
    $dom->formatOutput = true;
    $dom->loadXML($xml->asXML());
    return $dom->saveXML();
  }
}

/** Define one item in the RSS
  */
class rss_item
{
  /** The title of the item
    */
  private $title;

  /** The URL of the item
    */
  private $link;

  /** The item synopsis
    */
  private $description;

  /** Email address of the author of the item
    */
  private $author;

  /** URL of a page for comments relating to the item
    */
  private $comments;

  /** A string that uniquely identifies the item
    */
  private $guid;

  /** Indicates when the item was published
    */
  private $pubDate;

  /** Get/Set the value
    * @param string|null $title The title to get/set
    */
  public function title ($title = null)
  {
    if ($title === null)
      return $this->title;
    if (! is_string ($title))
      throw new \Exception ("Title provided to RSS Item is not a string", 500);
    if ($title === "")
      $title = null;
    $this->title = $title;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $link The link to get/set
    */
  public function link ($link = null)
  {
    if ($link === null)
      return $this->link;
    if (! is_string ($link))
      throw new \Exception ("Link provided to RSS Item is not a string", 500);
    $verify = new \verify ();
    if (! $verify->is_URL ($link))
      throw new \Exception ("Link provided to RSS Item is not an URL", 500);
    if ($link === "")
      $link = null;
    $this->link = $link;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $description The description to get/set
    */
  public function description ($description = null)
  {
    if ($description === null)
      return $this->description;
    if (! is_string ($description))
      throw new \Exception ("Description provided to RSS Item is not a string",
                            500);
    if ($description === "")
      $description = null;
    $this->description = $description;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $author The author to get/set
    */
  public function author ($author = null)
  {
    if ($author === null)
      return $this->author;
    if (! is_string ($author))
      throw new \Exception ("Author provided to RSS Item is not a string", 500);
    if ($author === "")
      $author = null;
    $this->author = $author;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $comments The comments to get/set
    */
  public function comments ($comments = null)
  {
    if ($comments === null)
      return $this->comments;
    if (! is_string ($comments))
      throw new \Exception ("Comments provided to RSS Item is not a string",
                            500);
    if ($comments === "")
      $comments = null;
    $this->comments = $comments;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $guid The guid to get/set
    */
  public function guid ($guid = null)
  {
    if ($guid === null)
      return $this->guid;
    if (! is_string ($guid))
      throw new \Exception ("GUID provided to RSS Item is not a string", 500);
    if ($guid === "")
      $guid = null;
    $this->guid = $guid;
    return $this;
  }

  /** Get/Set the value
    * @param string|null $pubDate The pubDate to get/set
    */
  public function pubDate ($pubDate = null)
  {
    if ($pubDate === null)
      return $this->pubDate;
    if (! is_string ($pubDate))
      throw new \Exception ("pubDate provided to RSS Item is not a string",
                            500);
    if (! \verify::staticIs_datetimeSQL ($pubDate))
      throw new \Exception ("pubDate provided to RSS Item is not a valid date",
                            500);
    if ($pubDate === "")
      $pubDate = null;
    else
      $pubDate = \convert::convertDate ($pubDate, "Y-m-d H:i:s",
                                        DateTime::RFC2822);
    $this->pubDate = $pubDate;
    return $this;
  }
}