<?php
class GithubIssueBridge extends BridgeAbstract
{
	const MAINTAINER = 'Pierre Mazière';
	const NAME = 'Github Issue';
	const URI = 'https://github.com/';
	const CACHE_TIMEOUT = 600; // 10min
  const DESCRIPTION = 'Returns the issues or comments of an issue of a github project';

	const PARAMETERS=array(
	'global' => array(
	  'u' => array(
		'name' => 'User name',
		'required' => true
	  ),
	  'p' => array(
		'name' => 'Project name',
		'required' => true
	  )
	),

	'Project Issues' => array(
	  'c' => array(
		'name' => 'Show Issues Comments',
		'type' => 'checkbox'
	  )
	),
	'Issue comments' => array(
	  'i' => array(
		'name' => 'Issue number',
		'type' => 'number',
		'required' => 'true'
	  )
	)
  );

	public function getName()
	{
		$name=$this->getInput('u').'/'.$this->getInput('p');
		switch ($this->queriedContext) {
	case 'Project Issues':
	  if ($this->getInput('c')) {
		  $prefix=static::NAME.'s comments for ';
	  } else {
		  $prefix=static::NAME.'s for ';
	  }
	  $name=$prefix.$name;
	  break;
	case 'Issue comments':
	  $name=static::NAME.' '.$name.' #'.$this->getInput('i');
	  break;
	}
		return $name;
	}

	public function getURI()
	{
		$uri = static::URI.$this->getInput('u').'/'.$this->getInput('p').'/issues';
		if ($this->queriedContext==='Issue comments') {
			$uri.='/'.$this->getInput('i');
		} elseif ($this->getInput('c')) {
			$uri.='?q=is%3Aissue+sort%3Aupdated-desc';
		}
		return $uri;
	}

	protected function extractIssueComment($issueNbr, $title, $comment)
	{
		$class=$comment->getAttribute('class');
		$classes=explode(' ', $class);
		$event=false;
		if (in_array('discussion-item', $classes)) {
			$event=true;
		}

		$author='unknown';
		if ($comment->find('.author', 0)) {
			$author=$comment->find('.author', 0)->plaintext;
		}

		$uri=static::URI.$this->getInput('u').'/'.$this->getInput('p').'/issues/'
	  .$issueNbr;

		$comment=$comment->firstChild();
		if (!$event) {
			$comment=$comment->nextSibling();
		}

		if ($event) {
			$title.=' / '.substr($class, strpos($class, 'discussion-item-')+strlen('discussion-item-'));
			if (!$comment->hasAttribute('id')) {
				$items=array();
				$timestamp=strtotime($comment->find('relative-time', 0)->getAttribute('datetime'));
				$content=$comment->innertext;
				while ($comment=$comment->nextSibling()) {
					$item=array();
					$item['author']=$author;
					$item['title']=html_entity_decode($title, ENT_QUOTES, 'UTF-8');
					$item['timestamp']=$timestamp;
					$item['content']=$content.'<p>'.$comment->children(1)->innertext.'</p>';
					$item['uri']=$uri.'#'.$comment->children(1)->getAttribute('id');
					$items[]=$item;
				}
				return $items;
			}
			$content=$comment->parent()->innertext;
		} else {
			$title.=' / '.trim($comment->firstChild()->plaintext);
			$content="<pre>".$comment->find('.comment-body', 0)->innertext."</pre>";
		}

		$item = array();
		$item['author']=$author;
		$item['uri']= $uri.'#'.$comment->getAttribute('id');
		$item['title']=html_entity_decode($title, ENT_QUOTES, 'UTF-8');
		$item['timestamp']=strtotime($comment->find('relative-time', 0)->getAttribute('datetime'));
		$item['content']=$content;
		return $item;
	}

	protected function extractIssueComments($issue)
	{
		$items=array();
		$title=$issue->find('.gh-header-title', 0)->plaintext;
		$issueNbr=trim(substr($issue->find('.gh-header-number', 0)->plaintext, 1));
		$comments=$issue->find('.js-discussion', 0);
		foreach ($comments->children() as $comment) {
			$classes=explode(' ', $comment->getAttribute('class'));
			if (in_array('discussion-item', $classes) ||
		in_array('timeline-comment-wrapper', $classes)
	  ) {
				$item=$this->extractIssueComment($issueNbr, $title, $comment);
				if (array_keys($item)!==range(0, count($item)-1)) {
					$item=array($item);
				}
				$items=array_merge($items, $item);
			}
		}
		return $items;
	}

	public function collectData()
	{
		$html = getSimpleHTMLDOM($this->getURI())
	  or returnServerError('No results for Github Issue '.$this->getURI());

		switch ($this->queriedContext) {
	case 'Issue comments':
	  $this->items=$this->extractIssueComments($html);
	  break;
	case 'Project Issues':
	  foreach ($html->find('.js-active-navigation-container .js-navigation-item') as $issue) {
		  $info=$issue->find('.opened-by', 0);
		  $issueNbr=substr(trim($info->plaintext), 1, strpos(trim($info->plaintext), ' '));

		  $item=array();
		  $item['content']='';

		  if ($this->getInput('c')) {
			  $uri=static::URI.$this->getInput('u').'/'.$this->getInput('p').'/issues/'.$issueNbr;
			  $issue=getSimpleHTMLDOMCached($uri, static::CACHE_TIMEOUT);
			  if ($issue) {
				  $this->items=array_merge($this->items, $this->extractIssueComments($issue));
				  continue;
			  }
			  $item['content']='Can not extract comments from '.$uri;
		  }

		  $item['author']=$info->find('a', 0)->plaintext;
		  $item['timestamp']=strtotime($info->find('relative-time', 0)->getAttribute('datetime'));
		  $item['title']=html_entity_decode(
		  $issue->find('.js-navigation-open', 0)->plaintext,
		  ENT_QUOTES,
		  'UTF-8'
		);
		  $comments=$issue->find('.col-5', 0)->plaintext;
		  $item['content'].="\n".'Comments: '.($comments?$comments:'0');
		  $item['uri']=self::URI.$issue->find('.js-navigation-open', 0)->getAttribute('href');
		  $this->items[]=$item;
	  }
	  break;
	}

		array_walk($this->items, function (&$item) {
			$item['content']=preg_replace('/\s+/', ' ', $item['content']);
			$item['content']=str_replace('href="/', 'href="'.static::URI, $item['content']);
			$item['content']=str_replace(
		'href="#',
		'href="'.substr($item['uri'], 0, strpos($item['uri'], '#')+1),
		$item['content']
	  );
			$item['title']=preg_replace('/\s+/', ' ', $item['title']);
		});
	}
}