<?php

final class Loader {

	protected $registry;



	public function __construct($registry) {

		$this->registry = $registry;

	}

	

	public function controller($route, $data = array()) {

		// Sanitize the call

		$route = preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route);

		

		$output = null;

		

		// Trigger the pre events

		$result = $this->registry->get('event')->trigger('controller/' . $route . '/before', array(&$route, &$data, &$output));

		

		if ($result) {

			return $result;

		}

		

		if (!$output) {

			$action = new Action($route);

			$output = $action->execute($this->registry, array(&$data));

		}

			

		// Trigger the post events

		$result = $this->registry->get('event')->trigger('controller/' . $route . '/after', array(&$route, &$data, &$output));

		

		if ($output instanceof Exception) {

			return false;

		}



		return $output;

	}

	

	public function model($route) {

		// Sanitize the call

		$route = preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route);

		

		// Trigger the pre events

		$this->registry->get('event')->trigger('model/' . $route . '/before', array(&$route));

		

		if (!$this->registry->has('model_' . str_replace(array('/', '-', '.'), array('_', '', ''), $route))) {

			$file  = DIR_APPLICATION . 'model/' . $route . '.php';

			$class = 'Model' . preg_replace('/[^a-zA-Z0-9]/', '', $route);

			

			if (is_file($file)) {

				include_once($file);

	

				$proxy = new Proxy();

				

				foreach (get_class_methods($class) as $method) {

					$proxy->{$method} = $this->callback($this->registry, $route . '/' . $method);

				}

				

				$this->registry->set('model_' . str_replace(array('/', '-', '.'), array('_', '', ''), (string)$route), $proxy);

			} else {

				throw new \Exception('Error: Could not load model ' . $route . '!');

			}

		}

		

		// Trigger the post events

		$this->registry->get('event')->trigger('model/' . $route . '/after', array(&$route));

	}



	public function view($route, $data = array()) {

		$output = null;

		

		// Sanitize the call

		$route = preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route);

		

		// Trigger the pre events

		$result = $this->registry->get('event')->trigger('view/' . $route . '/before', array(&$route, &$data, &$output));

		

		if ($result) {

			return $result;

		}

		

		if (!$output) {

			$template = new Template($this->registry->get('config')->get('template_type'));

			

			foreach ($data as $key => $value) {

				$template->set($key, $value);

			}

		

			$output = $template->render($route . '.tpl');

		}

		

		// Trigger the post events

		$result = $this->registry->get('event')->trigger('view/' . $route . '/after', array(&$route, &$data, &$output));

		

		if ($result) {

			return $result;

		}

		

		return $output;

	}



	public function library($route) {

		// Sanitize the call

		$route = preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route);

			

		$file = DIR_SYSTEM . 'library/' . $route . '.php';

		$class = str_replace('/', '\\', $route);



		if (is_file($file)) {

			include_once($file);



			$this->registry->set(basename($route), new $class($this->registry));

		} else {

			throw new \Exception('Error: Could not load library ' . $route . '!');

		}

	}

	

	public function helper($route) {

		$file = DIR_SYSTEM . 'helper/' . preg_replace('/[^a-zA-Z0-9_\/]/', '', (string)$route) . '.php';



		if (is_file($file)) {

			include_once($file);

		} else {

			throw new \Exception('Error: Could not load helper ' . $route . '!');

		}

	}

	

	public function config($route) {

		$this->registry->get('event')->trigger('config/' . $route . '/before', array(&$route));

		

		$this->registry->get('config')->load($route);

		

		$this->registry->get('event')->trigger('config/' . $route . '/after', array(&$route));

	}



	public function language($route) {

		$output = null;

		

		$this->registry->get('event')->trigger('language/' . $route . '/before', array(&$route, &$output));

		

		$output = $this->registry->get('language')->load($route);

		

		$this->registry->get('event')->trigger('language/' . $route . '/after', array(&$route, &$output));

		

		return $output;

	}

	

	protected function callback($registry, $route) {

		return function($args) use($registry, &$route) {

			static $model = array(); 			

			

			$output = null;

			

			// Trigger the pre events

			$result = $registry->get('event')->trigger('model/' . $route . '/before', array(&$route, &$args, &$output));

			

			if ($result) {

				return $result;

			}

			

			// Store the model object

			if (!isset($model[$route])) {

				$file = DIR_APPLICATION . 'model/' .  substr($route, 0, strrpos($route, '/')) . '.php';

				$class = 'Model' . preg_replace('/[^a-zA-Z0-9]/', '', substr($route, 0, strrpos($route, '/')));



				if (is_file($file)) {

					include_once($file);

				

					$model[$route] = new $class($registry);

				} else {

					throw new \Exception('Error: Could not load model ' . substr($route, 0, strrpos($route, '/')) . '!');

				}

			}



			$method = substr($route, strrpos($route, '/') + 1);

			

			$callable = array($model[$route], $method);



			if (is_callable($callable)) {

				$output = call_user_func_array($callable, $args);

			} else {

				throw new \Exception('Error: Could not call model/' . $route . '!');

			}

			

			// Trigger the post events

			$result = $registry->get('event')->trigger('model/' . $route . '/after', array(&$route, &$args, &$output));

			

			if ($result) {

				return $result;

			}

						

			return $output;

		};

	}	

}