<?php

class pluginRSS extends Plugin
{

	public function init()
	{
		// Fields and default values for the database of this plugin
		$this->dbFields = array(
			'numberOfItems' => 5
		);
	}

	// Method called on the settings of the plugin on the admin area
	public function form()
	{
		global $L;

		$html = '<div>';
		$html .= '<label>' . $L->get('RSS URL') . '</label>';
		$html .= '<a href="' . Theme::rssUrl() . '">' . Theme::rssUrl() . '</a>';
		$html .= '</div>';

		$html .= '<div>';
		$html .= '<label>' . $L->get('Amount of items') . '</label>';
		$html .= '<input id="jsnumberOfItems" name="numberOfItems" type="text" dir="auto" value="' . $this->getValue('numberOfItems') . '">';
		$html .= '<span class="tip">' . $L->get('Amount of items to show on the feed') . '</span>';
		$html .= '</div>';

		return $html;
	}

	private function encodeURL($url)
	{
		return preg_replace_callback('/[^\x20-\x7f]/', function ($match) {
			return urlencode($match[0]);
		}, $url);
	}

	private function createXML()
	{
		global $site;
		global $pages;
		global $url;

		// Amount of pages to show
		$numberOfItems = $this->getValue('numberOfItems');

		// Get the list of public pages (sticky and static included)
		$list = $pages->getList(
			$pageNumber = 1,
			$numberOfItems,
			$published = true,
			$static = true,
			$sticky = true,
			$draft = false,
			$scheduled = false
		);

		$xml = '<?xml version="1.0" encoding="UTF-8" ?>';
		$xml .= '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">';
		$xml .= '<channel>';
		$xml .= '<atom:link href="' . DOMAIN_BASE . 'rss.xml" rel="self" type="application/rss+xml" />';
		$xml .= '<title>' . $site->title() . '</title>';
		$xml .= '<link>' . $this->encodeURL($site->url()) . '</link>';
		$xml .= '<description>' . $site->description() . '</description>';
		$xml .= '<lastBuildDate>' . date(DATE_RSS) . '</lastBuildDate>';

		// Get keys of pages
		foreach ($list as $pageKey) {
			try {
				// Create the page object from the page key
				$page = new Page($pageKey);
				$xml .= '<item>';
				$xml .= '<title>' . $page->title() . '</title>';
				$xml .= '<link>' . $this->encodeURL($page->permalink()) . '</link>';
				$xml .= '<image>' . $page->coverImage(true) . '</image>';
				$xml .= '<description>' . Sanitize::html($page->contentBreak()) . '</description>';
				$xml .= '<pubDate>' . date(DATE_RSS, strtotime($page->getValue('dateRaw'))) . '</pubDate>';
				$xml .= '<guid isPermaLink="false">' . $page->uuid() . '</guid>';
				$xml .= '</item>';
			} catch (Exception $e) {
				// Continue
			}
		}

		$xml .= '</channel></rss>';

		// New DOM document
		$doc = new DOMDocument();
		$doc->formatOutput = true;
		$doc->loadXML($xml);
		return $doc->save($this->workspace() . 'rss.xml');
	}

	public function install($position = 0)
	{
		parent::install($position);
		return $this->createXML();
	}

	public function post()
	{
		parent::post();
		return $this->createXML();
	}

	public function afterPageCreate()
	{
		$this->createXML();
	}

	public function afterPageModify()
	{
		$this->createXML();
	}

	public function afterPageDelete()
	{
		$this->createXML();
	}

	public function siteHead()
	{
		return '<link rel="alternate" type="application/rss+xml" href="' . DOMAIN_BASE . 'rss.xml" title="RSS Feed">' . PHP_EOL;
	}

	public function beforeAll()
	{
		$webhook = 'rss.xml';
		if ($this->webhook($webhook)) {
			// Send XML header
			header('Content-type: text/xml');
			$doc = new DOMDocument();

			// Load XML
			libxml_disable_entity_loader(false);
			$doc->load($this->workspace() . 'rss.xml');
			libxml_disable_entity_loader(true);

			// Print the XML
			echo $doc->saveXML();

			// Stop Koblog execution
			exit(0);
		}
	}
}
