<?php

	/**
	 * The Legend of Z
	 *
	 * @author	Oliver Hanraths <oliver.hanraths@uni-duesseldorf.de>
	 * @copyright	2014 Heinrich-Heine-Universität Düsseldorf
	 * @license	http://www.gnu.org/licenses/gpl.html
	 * @link	https://bitbucket.org/coderkun/the-legend-of-z
	 */
	
	namespace hhu\z;
	
	
	/**
	 * Class to format text with different syntax tags.
	 * 
	 * @author	Oliver Hanraths <oliver.hanraths@uni-duesseldorf.de>
	 */
	class TextFormatter
	{
		/**
		 * Linker to create links.
		 * 
		 * @var Linker
		 */
		private $linker;
		/**
		 * Media-Model to retrieve media data
		 * 
		 * @static
		 * @var model
		 */
		private static $Media = null;
		
		
		
		
		/**
		 * Create a new text formatter.
		 * 
		 * @param	Linker $linker	Linker to create links with
		 */
		public function __construct(\nre\core\Linker $linker)
		{
			$this->linker = $linker;
		}
		
		
		
		
		/**
		 * Format a string.
		 * 
		 * @param	string	$string	String to format
		 * @return	string		Formatted string
		 */
		public function t($string)
		{
			// Remove chars
			$string = htmlspecialchars($string, ENT_NOQUOTES);
			
			// Important text
			$string = str_replace('[strong]', '<strong>', $string);
			$string = str_replace('[/strong]', '</strong>', $string);
			
			// Create tables
			$string = preg_replace('/(\[table\])\s+/u', '$1', $string);
			$string = preg_replace('/\s*(\[tr\])\s*/u', '$1', $string);
			$string = preg_replace('%\s+(\[/table\])%u', '$1', $string);
			$string = preg_replace('%\s*(\[/tr\])\s*%u', '$1', $string);
			$string = str_replace('[table]', '</p><table>', $string);
			$string = str_replace('[/table]', '</table><p>', $string);
			$string = str_replace('[tr]', '<tr>', $string);
			$string = str_replace('[/tr]', '</tr>', $string);
			$string = str_replace('[th]', '<th>', $string);
			$string = str_replace('[/th]', '</th>', $string);
			$string = str_replace('[td]', '<td>', $string);
			$string = str_replace('[/td]', '</td>', $string);
			
			// Create links
			$string = preg_replace('!(^|\s)"([^"]+)":(https?://[^\s]+)(\s|$)!i', '$1<a href="$3">$2</a>$4', $string);
			$string = preg_replace('!(^|\s)(https?://[^\s]+)(\s|$)!i', '$1<a href="$2">$2</a>$3', $string);
			
			// Handle Seminarymedia
			$seminarymedia = array();
			preg_match_all('/\[seminarymedia:(\d+)\]/iu', $string, $matches); //, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
			$seminarymediaIds = array_unique($matches[1]);
			foreach($seminarymediaIds as &$seminarymediaId)
			{
				$replacement = null;
				if(!is_null(\hhu\z\controllers\SeminaryController::$seminary) && $this->loadMediaModel())
				{
					try {
						$medium = self::$Media->getSeminaryMediaById($seminarymediaId);
						$replacement = sprintf(
							'<img src="%s" alt="%s" />',
							$this->linker->link(array('media','seminary', \hhu\z\controllers\SeminaryController::$seminary['url'],$medium['url'])),
							$medium['description']
						);
					}
					catch(\nre\exceptions\IdNotFoundException $e) {
					}
				}
				
				$seminarymedia[$seminarymediaId] = $replacement;
			}
			foreach($seminarymedia as $seminarymediaId => $replacement) {
				$string = str_replace("[seminarymedia:$seminarymediaId]", $replacement, $string);
			}
			
			
			// Return processed string
			return nl2br($string);
		}
		
		
		
		
		/**
		 * Load the Media-Model if it is not loaded
		 * 
		 * @return	boolean	Whether the Media-Model has been loaded or not
		 */
		private function loadMediaModel()
		{
			// Do not load Model if it has already been loaded
			if(!is_null(self::$Media)) {
				return true;
			}
			
			try {
				// Load class
				Model::load('media');
			
				// Construct Model
				self::$Media = Model::factory('media');
			}
			catch(\Exception $e) {
			}
			
			
			// Return whether Media-Model has been loaded or not
			return !is_null(self::$Media);
		}
		
	}

?>
