<?php

	/**
	 * NRE
	 *
	 * @author	coderkun <olli@coderkun.de>
	 * @copyright	2013 coderkun (http://www.coderkun.de)
	 * @license	http://www.gnu.org/licenses/gpl.html
	 * @link	http://www.coderkun.de/projects/nre
	 */
	
	namespace nre\core;
	
	
	/**
	 * View.
	 * 
	 * Class to encapsulate a template file and to provide rendering methods.
	 * 
	 * @author	coderkun <olli@coderkun.de>
	 */
	class View
	{
		/**
		 * Template filename
		 * 
		 * @var string
		 */
		protected $templateFilename;
		
		
		
		
		/**
		 * Load and instantiate the View of an Agent.
		 * 
		 * @throws	ViewNotFoundException
		 * @param	string	$layoutName	Name of Layout in use
		 * @param	string	$agentName	Name of the Agent
		 * @param	string	$action		Current Action
		 * @param	bool	$isToplevel	Agent is a ToplevelAgent
		 */
		public static function loadAndFactory($layoutName, $agentName=null, $action=null, $isToplevel=false)
		{
			return new View($layoutName, $agentName, $action, $isToplevel);
		}
		
		
		
		
		/**
		 * Construct a new View.
		 * 
		 * @throws	ViewNotFoundException
		 * @param	string	$layoutName	Name of Layout in use
		 * @param	string	$agentName	Name of the Agent
		 * @param	string	$action		Current Action
		 * @param	bool	$isToplevel	Agent is a ToplevelAgent
		 */
		protected function __construct($layoutName, $agentName=null, $action=null, $isToplevel=false)
		{
			// Create template filename
			// LayoutName
			$fileName = ROOT.DS. \nre\configs\CoreConfig::getClassDir('views').DS. strtolower($layoutName).DS;
			// AgentName and Action
			if(strtolower($agentName) != strtolower($layoutName) || !$isToplevel) {
				$fileName .= strtolower($agentName).DS.strtolower($action);
			}
			else {
				$fileName .= strtolower($layoutName);
			}
			// File extension
			$fileName .= \nre\configs\CoreConfig::getFileExt('views');
			
			
			// Check template file
			if(!file_exists($fileName)) {
				throw new \nre\exceptions\ViewNotFoundException($fileName);
			}
			
			// Save filename
			$this->templateFilename = $fileName;
		}
		
		
		
		
		/**
		 * Generate output
		 * 
		 * @param	array	$data	Data to have available in the template file
		 */
		public function render($data)
		{
			// Extract data
			if(!is_null($data)) {
				extract($data, EXTR_SKIP);
			}
			
			// Buffer output
			ob_start();
			
			// Include template
			include($this->templateFilename);
			
			
			// Return buffered output
			return ob_get_clean();
		}
		
		
		/**
		 * Get template filename.
		 * 
		 * @return	string	Template filename
		 */
		public function getTemplateFilename()
		{
			return $this->templateFilename;
		}
		
	}

?>
