<?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\controllers;
	
	
	/**
	 * Controller of the MediaAgent to process and show Media.
	 * 
	 * @author	Oliver Hanraths <oliver.hanraths@uni-duesseldorf.de>
	 */
	class MediaController extends \hhu\z\controllers\SeminaryController
	{
		/**
		 * User permissions
		 * 
		 * @var array
		 */
		public $permissions = array(
			'index' 		=> array('admin', 'moderator', 'user', 'guest'),
			'seminarymoodpic'	=> array('admin', 'moderator', 'user'),
			'seminary' 		=> array('admin', 'moderator', 'user'),
			'avatar'		=> array('admin', 'moderator', 'user'),
			'achievement'		=> array('admin', 'moderator', 'user')
		);
		/**
		 * User seminary permissions
		 * 
		 * @var array
		 */
		public $seminaryPermissions = array(
			'seminary' 	=> array('admin', 'moderator', 'user', 'guest'),
			'achievement'	=> array('admin', 'moderator', 'user', 'guest')
		);
		/**
		 * Required models
		 * 
		 * @var array
		 */
		public $models = array('seminaries', 'achievements', 'media', 'avatars', 'charactergroups');
		
		
		
		
		/**
		 * Prefilter.
		 * 
		 * @param	Request		$request	Current request
		 * @param	Response	$response	Current response
		 */
		public function preFilter(\nre\core\Request $request, \nre\core\Response $response)
		{
			parent::preFilter($request, $response);
			
			// Set headers for caching control
			$response->addHeader("Pragma: public");
			$response->addHeader("Cache-control: must-revalidate");
			$response->addHeader("Date: ".gmdate(\DateTime::RFC822));
		}
		
		
		/**
		 * Action: index
		 * 
		 * Display a medium.
		 * 
		 * @param	string	$mediaUrl	URL-name of the medium
		 * @param	string	$action		Action for processing the media
		 */
		public function index($mediaUrl, $action=null)
		{
			// Get Media
			$media = $this->Media->getMediaByUrl($mediaUrl);
			
			// Get file
			$file = $this->getMediaFile($media, $action);
			if(is_null($media)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		/**
		 * Action: seminarymoodpic
		 * 
		 * Display the moodpic for a category of a Seminary.
		 * 
		 * @throws	IdNotFoundException
		 * @param	string	$seminaryUrl	URL-title of the Seminary
		 * @param	string	$category	Category to show moodpic of
		 * @param	string	$action		Action for processing the media
		 */
		public function seminarymoodpic($seminaryUrl, $category=null, $action=null)
		{
			// Get Seminary
			$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
			
			// Set index
			switch($category)
			{
				case null:
					$index = 'seminarymedia_id';
				break;
				case 'charactergroups':
					$index = 'charactergroups_seminarymedia_id';
				break;
				case 'achievements':
					$index = 'achievements_seminarymedia_id';
				break;
				case 'library':
					$index = 'library_seminarymedia_id';
				break;
			}
			
			// Get media
			$media = $this->Media->getSeminaryMediaById($seminary[$index]);
			
			// Get file
			$file = $this->getMediaFile($media, $action);
			if(is_null($file)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		/**
		 * Action: seminary.
		 * 
		 * Display a Seminary medium.
		 * 
		 * @throws	IdNotFoundException
		 * @param	string	$seminaryUrl	URL-title of the Seminary
		 * @param	string	$mediaUrl	URL-name of the medium
		 * @param	string	$action		Action for processing the media
		 */
		public function seminary($seminaryUrl, $mediaUrl, $action=null)
		{
			// Get Seminary
			$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
			
			// Get Media
			$media = $this->Media->getSeminaryMediaByUrl($seminary['id'], $mediaUrl);
			
			// Get file
			$file = $this->getMediaFile($media, $action);
			if(is_null($file)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		/**
		 * Action: avatar.
		 * 
		 * Display an Avatar as full size or portrait.
		 * 
		 * @throws	ParamsNotValidException
		 * @throws	IdNotFoundException
		 * @param	string	$seminaryUrl		URL-title of the Seminary
		 * @param	string	$charactertypeUrl	URL-title of Character type
		 * @param	int	$xplevel		XP-level
		 * @param	string	$action			Size to show (avatar or portrait)
		 */
		public function avatar($seminaryUrl, $charactertypeUrl, $xplevel, $action='avatar')
		{
			// Get Seminary
			$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
			
			// Get Avatar
			$avatar = $this->Avatars->getAvatarByTypeAndLevel($seminary['id'], $charactertypeUrl, $xplevel);
			
			// Get media
			switch($action)
			{
				case null:
				case 'avatar':
					$media = $this->Media->getSeminaryMediaById($avatar['avatarpicture_id']);
					$file = $this->getMediaFile($media, 'avatar');
				break;
				case 'portrait':
					$media = $this->Media->getSeminaryMediaById($avatar['small_avatarpicture_id']);
					$file = $this->getMediaFile($media);
				break;
				default:
					throw new \nre\exceptions\ParamsNotValidException($action);
				break;
			}
			
			// Get file
			if(is_null($file)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		/**
		 * Action: achievement
		 * 
		 * Display the achievement of a Seminary.
		 * 
		 * @throws	IdNotFoundException
		 * @param	string	$seminaryUrl	URL-title of the Seminary
		 * @param	string	$achievementUrl	URL-title of the Achievement
		 * @param	string	$action		Action for processing the media
		 */
		public function achievement($seminaryUrl, $achievementUrl, $locked=null)
		{
			// Get Seminary
			$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
			
			// Get Character
			$character = SeminaryController::$character;
			
			// Get Achievement
			$achievement = $this->Achievements->getAchievementByUrl($seminary['id'], $achievementUrl);
			
			// Get media
			switch($locked)
			{
				case null:
					if(is_null($character) || !$this->Achievements->hasCharacterAchievedAchievement($achievement['id'], $character['id'])) {
						throw new \nre\exceptions\AccessDeniedException();
					}
					$index = 'achieved_achievementsmedia_id';
				break;
				case 'locked':
					$index = 'unachieved_achievementsmedia_id';
				break;
				default:
					throw new \nre\exceptions\ParamsNotValidException($locked);
				break;
			}
			if(is_null($achievement[$index])) {
				throw new \nre\exceptions\IdNotFoundException($achievementUrl);
			}
			$media = $this->Media->getSeminaryMediaById($achievement[$index]);
			
			// Get file
			$file = $this->getMediaFile($media, null);
			if(is_null($file)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		/**
		 * Action: charactergroup
		 * 
		 * Display the icon for a Character group of a Seminary.
		 * 
		 * @throws	IdNotFoundException
		 * @param	string	$seminaryUrl	URL-Title of a Seminary
		 * @param	string	$groupsgroupUrl	URL-Title of a Character groups-group
		 * @param	string	$groupUrl	URL-Title of a Character group
		 */
		public function charactergroup($seminaryUrl, $groupsgroupUrl, $groupUrl)
		{
			// Get seminary
			$seminary = $this->Seminaries->getSeminaryByUrl($seminaryUrl);
			
			// Get Character groups-group
			$groupsgroup = $this->Charactergroups->getGroupsgroupByUrl($seminary['id'], $groupsgroupUrl);
			
			// Get Character group
			$group = $this->Charactergroups->getGroupByUrl($groupsgroup['id'], $groupUrl);
			
			// Check media
			if(is_null($group['charactergroupsmedia_id'])) {
				$this->redirect($this->linker->link(array('grafics','charactergroup.jpg')));
			}
			
			// Get media
			$media = $this->Media->getSeminaryMediaById($group['charactergroupsmedia_id']);
			
			// Get file
			$file = $this->getMediaFile($media, 'charactergroup');
			if(is_null($file)) {
				return;
			}
			
			
			// Pass data to view
			$this->set('media', $media);
			$this->set('file', $file);
		}
		
		
		
		
		/**
		 * Determine file information and set the HTTP-header for
		 * caching accordingly.
		 * 
		 * @param	string	$fileName	Filename
		 * @return	boolean			HTTP-status 304 was set (in cache)
		 */
		private function setCacheHeaders($fileName)
		{
			// Determine last change of file
			$fileLastModified = gmdate('r', filemtime($fileName));
			
			// Generate E-Tag
			$fileEtag = hash('sha256', $fileLastModified.$fileName);
			
			
			// Set header
			$this->response->addHeader("Last-Modified: ".$fileLastModified);
			$this->response->addHeader("Etag: ".$fileEtag);
			// HTTP-status
			$headerModifiedSince = $this->request->getServerParam('HTTP_IF_MODIFIED_SINCE');
			$headerNoneMatch = $this->request->getServerParam('HTTP_IF_NONE_MATCH');
			if(
				!is_null($headerModifiedSince) && strtotime($fileLastModified) <= strtotime($headerModifiedSince) &&
				!is_null($headerNoneMatch) && $headerNoneMatch == $fileEtag
			) {
				$this->response->setExit(true);
				$this->response->addHeader(\nre\core\WebUtils::getHttpHeader(304));
				
				return true;
			}
			
			
			return false;
		}
		
		
		/**
		 * Determine the file for a medium and process it if necessary.
		 * 
		 * @throws	IdNotFoundException
		 * @throws	ParamsNotValidException
		 * @param	array	$media	Medium to get file for
		 * @param	string	$action	Action for processing the media
		 * @return	object		File for the medium (or null if medium is cached)
		 */
		private function getMediaFile($media, $action=null)
		{
			// Get format
			$format = explode('/', $media['mimetype']);
			$format = $format[1];
			
			// Set content-type
			$this->response->addHeader("Content-type: ".$media['mimetype']."");
			
			// Set filename
			$media['filename'] = ROOT.DS.\nre\configs\AppConfig::$dirs['seminarymedia'].DS.$media['id'];
			if(!file_exists($media['filename'])) {
				throw new \nre\exceptions\IdNotFoundException($mediaUrl);
			}
			
			// Cache
			if($this->setCacheHeaders($media['filename'])) {
				return null;
			}
			
			// Load and process file
			$file = null;
			switch($action)
			{
				// No action
				case null:
					// Do not process the file
					$file = file_get_contents($media['filename']);
				break;
				case 'questgroup':
					if(!in_array(strtoupper($format), self::getImageTypes())) {
						$file = file_get_contents($media['filename']);
					}
					else
					{
						$file = self::resizeImage(
							$media['filename'],
							$format,
							\nre\configs\AppConfig::$media['questgroup']['width'],
							\nre\configs\AppConfig::$media['questgroup']['height']
						);
					}
				break;
				case 'avatar':
					$file = self::resizeImage(
						$media['filename'],
						$format,
						\nre\configs\AppConfig::$media['avatar']['width'],
						\nre\configs\AppConfig::$media['avatar']['height']
					);
				break;
				case 'charactergroup':
					$file = self::resizeImage(
						$media['filename'],
						$format,
						\nre\configs\AppConfig::$media['charactergroup']['width'],
						\nre\configs\AppConfig::$media['charactergroup']['height']
					);
				break;
				default:
					throw new ParamsNotValidException($action);
				break;
			}
			
			
			// Return file
			return $file;
		}
		
		
		/**
		 * Get supported image types.
		 * 
		 * @return	array	List of supported image types
		 */
		private static function getImageTypes()
		{
			$im = new \Imagick();
			
			
			return $im->queryFormats();
		}
		
		
		/**
		 * Resize an image.
		 * 
		 * @param	string	$fileName	Absolute pathname of image to resize
		 * @param	string	$mimeType	Mimetype of target image
		 * @param	int	$width		Max. width to resize to
		 * @param	int	$height		Max. height to resize to
		 * @return	mixed			Resized image
		 */
		private static function resizeImage($fileName, $mimeType, $width, $height)
		{
			// Read image from cache
			$tempFileName = ROOT.DS.\nre\configs\AppConfig::$dirs['temporary'].DS.'media-'.basename($fileName).'-'.$width.'x'.$height;
			if(file_exists($tempFileName))
			{
				// Check age of file
				if(date('r', filemtime($tempFileName)+(60*60*24)) > date('r', time())) {
					// Too old, delete
					unlink($tempFileName);
				}
				else {
					// Valid, read and return
					return file_get_contents($tempFileName);
				}
			}
			
			
			// ImageMagick
			$im = new \Imagick($fileName);
			
			// Calculate new size
			$geometry = $im->getImageGeometry();
			if($geometry['width'] < $width) {
				$width = $geometry['width'];
			}
			if($geometry['height'] < $height) {
				$height = $geometry['width'];
			}
			
			// Process 
			$im->thumbnailImage($width, $height, true);
			$im->contrastImage(1);
			$im->setImageFormat($mimeType);
			
			// Save temporary file
			$im->writeImage($tempFileName);
			
			
			// Return resized image
			return $im;
		}
		
	}

?>