<?php
global $MODULE_DIR, $UTIL_DIR;

include_once($UTIL_DIR . "/convert.php");
include_once($UTIL_DIR . "/markdown.php");
include_once($MODULES_DIR . "/rss.php");

class RSSEntry {
	public $title;
	public $time;
	public $description;
	public $category;

	public function RSSEntry($title, $time, $category, $description)
	{
		$this->title = $title;
		$this->time = $time;
		$this->category = $category;
		$this->description = $description;
	}
}

class RSS {

	private $configfile;
	private $config;
	private $newsfile;
	private $news = array();
	private $newspage;

	public function add($newsentry) {
		$key = $newsentry->time;
		$this->news[$key] = $newsentry;
	}

	private function date($time) {
		return date("r", $time);
	}

	public function write()
	{
		$fp = fopen($this->config->target, "w");
		fwrite($fp, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
		fwrite($fp, "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">\n");
		fwrite($fp, "   <channel>\n");
		fwrite($fp, "      <title>".$this->config->title."</title>\n");
		fwrite($fp, "      <atom:link href=\"".$this->config->url."/rss.xml\" rel=\"self\" type=\"application/rss+xml\" />\n");
		fwrite($fp, "      <link>".$this->config->url."</link>\n");
		fwrite($fp, "      <description>".$this->config->description."</description>\n");
		fwrite($fp, "      <language>en-us</language>\n");
		fwrite($fp, "      <pubDate>".$this->date(time())."</pubDate>\n");
		fwrite($fp, "      <lastBuildDate>".$this->date(time())."</lastBuildDate>\n");
		fwrite($fp, "      <docs>http://blogs.law.harvard.edu/tech/rss</docs>\n");
		fwrite($fp, "      <generator>ExecutionRoom CMS</generator>\n");
		fwrite($fp, "      <managingEditor>".$this->config->editoremail."</managingEditor>\n");
		fwrite($fp, "      <webMaster>".$this->config->webmasteremail."</webMaster>\n");

		$i = 0;
		foreach($this->news as $newsentry) {
			fwrite($fp, "      <item>\n");
			fwrite($fp, "         <title>".$newsentry->title."</title>\n");
			fwrite($fp, "         <link>".$this->config->url."/?page=".$this->newspage."&amp;newsid=".$newsentry->time."</link>\n");
			$content = htmlspecialchars(Markdown(htmlspecialchars_decode($newsentry->description), true));
			fwrite($fp, "         <description>".$content."</description>\n");
			fwrite($fp, "         <pubDate>".$this->date($newsentry->time)."</pubDate>\n");
			fwrite($fp, "         <guid>".$this->config->url."/?page=".$this->newspage."&amp;newsid=".$newsentry->time."</guid>\n");
			fwrite($fp, "      </item>\n");
			$i++;
			if($i > 6) break;
		}

		fwrite($fp, "   </channel>\n");
		fwrite($fp, "</rss>\n");

		fclose($fp);
	}
	
	private function read()
	{
		$this->config = new RSSConfig($this->configfile);

		$dom = new DomDocument;
		$dom->preserveWhiteSpace = FALSE;
		$dom->load($this->newsfile);

		$n = $dom->documentElement;
		$this->newspage = $n->getAttribute('newspage');

		$params = $dom->getElementsByTagName('newsentry');

		foreach ($params as $param) {
			$rssentry = new RSSEntry($param->getAttribute('title'),
															 $param->getAttribute('time'),
															 $param->getAttribute('category'),
															 $param->textContent);
			$this->add($rssentry);
		}
		
		// Key sort
		krsort($this->news);
	}

	public function RSS($newsfile, $configfile)
	{
		$this->newsfile =  $newsfile;
		$this->configfile =  $configfile;
		$this->read();
	}

}

?>