<?php

require('qjerry.php');

class qJerrySite {
	private $layout;
	private $lang;
	private $langs;
	private $dict;
	private $content;
	private $news;
	private $release;
	private $counters;
	
	const	DTD_PUBLIC = '-//W3C//DTD XHTML 1.0 Transitional//EN';
	const	DTD_SYSTEM = 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd';
	
	public function __construct()
	{
		$this->layout = new qJerry('./layout.xml');
		$this->langs = new qJerry('./langs.xml');
		
		// detect output language
		$defaultLang = $this->langs->children("lang[@default='yes']")->attr('id');
		$lang = isset($_GET['lang']) ? $_GET['lang'] : $defaultLang;
		if(!$this->langs->children("lang[@id='$lang']")->length)
			$lang = $defaultLang;
		
		$this->lang = $lang;
		$this->dict = $this->langs->children("lang[@id='$this->lang']")->children('dictionary');
		
		// load content
		$this->content = new qJerry("./site.{$this->lang}.xml");
		$this->news = new qJerry("./news.{$this->lang}.xml");
		$this->release = new qJerry('./release.xml');
		$this->counters = new qJerry('./counters.xml');
	}
	
	private function layout()
	{
		$this->layout->
		
		// set document type
		doctype('html', self::DTD_PUBLIC, self::DTD_SYSTEM)->
		
		// set main page title
		find('head/title')->text($this->content->children('title')->text())->
		
		// set keywords meta
		siblings("@name='keywords'")->attr('content', $this->content->children('keywords')->text())->
		
		// set description meta
		siblings("@name='description'")->attr('content', $this->content->children('description')->text())->root()->
		
		// set h1 title
		find('body/h1')->text($this->content->children('title')->text())->
		
		// output intro
		siblings("@id='intro'")->append($this->content->children('content')->children());
	}
	
	private function languages()
	{
		$langs = $this->layout->find("body//div[@id='langs']");
		
		foreach($this->langs->children() as $lang) {
			$langCode = $lang->attr('id');
			$langName = $lang->attr('name');
			
			if($langCode == $this->lang)
				$langs->append('span')->text($langName);
			
			else {
				$href = $langCode == key($this->langs) ? '/' : "?lang=$langCode";
				$langs->append('a')->attr('href', $href)->text($langName);
			}
		}
	}
	
	private function toc()
	{
		$ol = $this->layout->find("body//div[@id='toc']")->append('ol');
		
		foreach($this->content->children('section') as $section)
			$ol->append('li')->
			append('a')->attr('href', '#'.$section->attr('id'))->text($section->children('name')->text());
	}
	
	private function content()
	{
		$sections = $this->layout->children("body//div[@id='content']");
		
		foreach($this->content->children('section') as $section)
			$sections->append('div')->attr('class', 'section')->
			append('a')->attr('name', $section->attr('id'))->
			after('h2')->text($section->children('title')->text())->parent()->
			append($section->children('content')->children())->parent()->
			append('p')->attr('class', 'top')->
			append('a')->attr('href', '#top')->text($this->dict->children('top')->text())->parent()->
			appendText(' ↑');
	}
	
	private function download()
	{
		$download = $this->layout->find("body//div[@id='download']");
		
		$download->
		append('h3')->text($this->dict->children('download')->text())->
		after('p')->text($this->dict->children('current')->text().': ')->
			append('a')->attr('href', $this->release->children('link')->text())->
				attr('target', '_blank')->
				text($this->release->children('title')->text())->parent()->
				appendText(' ')->append('span')->attr('class', 'rdate')->text('('.$this->release->attr('date').')')->parent()->
				appendText('.');
				
		$download->append('p')->
			append('a')->attr('href', $this->release->children('changes')->text())->
				attr('target', '_blank')->
				text($this->dict->children('changes')->text())->parent()->
				appendText('.');
	}
	
	private function news()
	{
		$news = $this->layout->find("body//div[@id='news']");
		$news->append('h3')->text($this->dict->children('news')->text());
		
		foreach($this->news->children('message') as $message)
			$news->append('dl')->
			append('dt')->
			append('span')->attr('class', 'title')->text($message->children('title')->text())->
			after('br')->
			after('span')->attr('class', 'rdate')->text($message->attr('date'))->parent()->
			after('dd')->
			append($message->children('content')->children());
	}
	
	private function footer()
	{
		$this->layout->children('body')->append($this->counters->children());
	}
	
	public function render()
	{
		$this->layout();	// populate template with generic data
		$this->languages();	// language selector
		$this->toc();		// table of contents
		$this->content();	// content sections
		$this->download();	// download block
		$this->news();		// news block
		$this->footer();	// counter
	}
	
	public function output()
	{
		// implicitly called qJerry::__toString() method
		echo $this->layout->format();
	}
}

try {
	$site = new qJerrySite();
	$site->render();
	$site->output();
}

catch(qJException $ex) {
	echo "Oops! ".$ex->getMessage();
}

catch(Exception $ex) {
	echo "WTF? ".$ex->getMessage();
}

?>