<?php
class KernelBugTrackerBridge extends BridgeAbstract {

	const NAME = 'Kernel Bug Tracker';
	const URI = 'https://bugzilla.kernel.org';
	const DESCRIPTION = 'Returns feeds for bug comments';
	const MAINTAINER = 'logmanoriginal';
	const PARAMETERS = array(
		'Bug comments' => array(
			'id' => array(
				'name' => 'Bug tracking ID',
				'type' => 'number',
				'required' => true,
				'title' => 'Insert bug tracking ID',
				'exampleValue' => 121241
			),
			'limit' => array(
				'name' => 'Number of comments to return',
				'type' => 'number',
				'required' => false,
				'title' => 'Specify number of comments to return',
				'defaultValue' => -1
			),
			'sorting' => array(
				'name' => 'Sorting',
				'type' => 'list',
				'required' => false,
				'title' => 'Defines the sorting order of the comments returned',
				'defaultValue' => 'of',
				'values' => array(
					'Oldest first' => 'of',
					'Latest first' => 'lf'
				)
			)
		)
	);

	private $bugid = '';
	private $bugdesc = '';

	public function getIcon() {
		return self::URI . '/images/favicon.ico';
	}

	public function collectData(){
		$limit = $this->getInput('limit');
		$sorting = $this->getInput('sorting');

		// We use the print preview page for simplicity
		$html = getSimpleHTMLDOMCached($this->getURI() . '&format=multiple',
		86400,
		null,
		null,
		true,
		true,
		DEFAULT_TARGET_CHARSET,
		false, // Do NOT remove line breaks
		DEFAULT_BR_TEXT,
		DEFAULT_SPAN_TEXT);

		if($html === false)
			returnServerError('Failed to load page!');

		// Store header information into private members
		$this->bugid = $html->find('#bugzilla-body', 0)->find('a', 0)->innertext;
		$this->bugdesc = $html->find('table.bugfields', 0)->find('tr', 0)->find('td', 0)->innertext;

		// Get and limit comments
		$comments = $html->find('div.bz_comment');

		if($limit > 0 && count($comments) > $limit) {
			$comments = array_slice($comments, count($comments) - $limit, $limit);
		}

		// Order comments
		switch($sorting) {
			case 'lf': $comments = array_reverse($comments, true);
			case 'of':
			default: // Nothing to do, keep original order
		}

		foreach($comments as $comment) {
			$comment = $this->inlineStyles($comment);

			$item = array();
			$item['uri'] = $this->getURI() . '#' . $comment->id;
			$item['author'] = $comment->find('span.bz_comment_user', 0)->innertext;
			$item['title'] = $comment->find('span.bz_comment_number', 0)->find('a', 0)->innertext;
			$item['timestamp'] = strtotime($comment->find('span.bz_comment_time', 0)->innertext);
			$item['content'] = $comment->find('pre.bz_comment_text', 0)->innertext;

			// Fix line breaks (they use LF)
			$item['content'] = str_replace("\n", '<br>', $item['content']);

			// Fix relative URIs
			$item['content'] = $this->replaceRelativeURI($item['content']);

			$this->items[] = $item;
		}

	}

	public function getURI(){
		switch($this->queriedContext) {
			case 'Bug comments':
				return parent::getURI()
				. '/show_bug.cgi?id='
				. $this->getInput('id');
				break;
			default: return parent::getURI();
		}
	}

	public function getName(){
		switch($this->queriedContext) {
			case 'Bug comments':
				return 'Bug '
				. $this->bugid
				. ' tracker for '
				. $this->bugdesc
				. ' - '
				. parent::getName();
				break;
			default: return parent::getName();
		}
	}

	/**
	 * Replaces all relative URIs with absolute ones
	 *
	 * @param string $content The source string
	 * @return string Returns the source string with all relative URIs replaced
	 * by absolute ones.
	 */
	private function replaceRelativeURI($content){
		return preg_replace('/href="(?!http)/', 'href="' . self::URI . '/', $content);
	}

	/**
	 * Adds styles as attributes to tags with known classes
	 *
	 * @param object $html A simplehtmldom object
	 * @return object Returns the original object with styles added as
	 * attributes.
	 */
	private function inlineStyles($html){
		foreach($html->find('.bz_obsolete') as $element) {
			$element->style = 'text-decoration:line-through;';
		}

		return $html;
	}
}
