<?php

class TwigWrapper
{
	private $htmlPath;

	public function __construct($htmlPath)
	{
		$this->setHtmlPath($htmlPath);
		$this->initTwig();
	}

	private function initTwig()
	{
		Twig_Autoloader::register();
		$loader = new Twig_Loader_Filesystem($this->htmlPath);
		$this->twig = new Twig_Environment($loader, array());
	}

	public function setHtmlPath($htmlPath)
	{
		if(!file_exists($htmlPath))
		{
			throw new TwigClassException('Path does not exist');
		}
		
		$this->htmlPath = $htmlPath;
	}

	public function render($file, $options)
	{
		$options['all'] = array_keys($options);
		return $this->twig->render($file, $options);
	}

	public function createSimpleFunc($name, /*callable*/ $function)
	{
		if(!is_callable($function))
		{
			throw new TwigClassException('Second param must be a function');
		}
		
		return $this->twig->addFunction(new Twig_SimpleFunction($name, $function));
	}

	public function createSimpleFilter($name, /*callable*/ $function)
	{
		if(!is_callable($function))
		{
			throw new TwigClassException('Second param must be a function');
		}
		
		return $this->twig->addFilter(new Twig_SimpleFilter($name, $function));
	}
}

class TwigClassException extends Exception
{
}