<?php

namespace b8;
use b8\Exception\HttpException;

class View
{
	protected $_vars = array();
	protected static $_helpers = array();
    protected static $extension = 'phtml';

	public function __construct($file, $path = null)
	{
		if (!self::exists($file, $path)) {
			throw new \Exception('View file does not exist: ' . $file);
		}

		$this->viewFile = self::getViewFile($file, $path);
	}

	protected static function getViewFile($file, $path = null)
	{
		$viewPath = is_null($path) ? Config::getInstance()->get('b8.view.path') : $path;
		$fullPath = $viewPath . $file . '.' . static::$extension;

        return $fullPath;
	}

	public static function exists($file, $path = null)
	{
		if (!file_exists(self::getViewFile($file, $path))) {
			return false;
		}

		return true;
	}

	public function __isset($var)
	{
		return isset($this->_vars[$var]);
	}

	public function __get($var)
	{
		return $this->_vars[$var];
	}

	public function __set($var, $val)
	{
		$this->_vars[$var] = $val;
	}

	public function __call($method, $params = array())
	{
		if(!isset(self::$_helpers[$method]))
		{
			$class = '\\' . Config::getInstance()->get('b8.app.namespace') . '\\Helper\\' . $method;

			if(!class_exists($class))
			{
				$class = '\\b8\\View\\Helper\\' . $method;
			}

			if(!class_exists($class))
			{
				throw new HttpException('Helper class does not exist: ' . $class);
			}

			self::$_helpers[$method] = new $class();
		}

		return self::$_helpers[$method];
	}

	public function render()
	{
		extract($this->_vars);

		ob_start();
		require($this->viewFile);
		$html = ob_get_contents();
		ob_end_clean();

		return $html;
	}
}