<?php
/* PHP IFB_CACHE CLASS 1.0.1
 * Copyright © 2011 Infobull.net, All Rights Reserved
 * License: http://www.gnu.org/licenses/gpl.html
 * Require php 5.2++
 * $Id: ifbCache.php rev 3 $ Ricko $ 2011/01/06
 * @charset = 'UTF-8'
*/

class ifbCache
{
	const varPFIX = 'c';
	public $now;
	
	protected $cacheDir;
	protected $cache = array('file' => array(), 'data' => array(), 'save' => array());
	protected $cacheExt = array(0 => '.dat', 1 => '.php', 2 => '.gz', 3 => '.inc');

	public function __construct($cacheDir = 'cache')
	{
		$this->cacheDir = $cacheDir.'/';
		$this->now = time();
	}

/********** PARTIE 1 : Chargement et lecture des fichiers **********/

	// public loadFiles( mixed $files, [int $dataType = NULL] )
	public function loadFiles($files, $dataType = NULL)
	{
		if(!is_array($files))
			return $this->loadData($files, $dataType, true);
		
		foreach($files as $fileName)
		{
			$this->loadData($fileName, $dataType);
		}
	}
	
	// public getVar( string $fileName , string $var )
	public function getVar($fileName, $var)
	{
		return isset($this->cache['data'][$fileName][$var]) ? $this->cache['data'][$fileName][$var] : NULL;
	}
	// public getData( string $fileName )
	public function getData($fileName)
	{
		return isset($this->cache['data'][$fileName]) ? $this->cache['data'][$fileName] : NULL;
	}
	// public getAll()
	public function getAll()
	{
		return $this->cache['data'];
	}

/********** PARTIE 2 : Mise à jour et sauvegarde des fichiers **********/

	public function setVar($fileName, $key, $var, $dataType = 0)
	{
		if(!isset($this->cache['data'][$fileName]))
			$this->loadData($fileName, $dataType, false);
		if(!isset($this->cache['file'][$fileName]))
			$this->cache['file'][$fileName] = 0;
		if(!in_array($fileName, $this->cache['save']))
			$this->cache['save'][] = $fileName;
		
		$this->cache['data'][$fileName][$key] = $var;
	}

	// Func assignVars( $fileName[string], $var[array], isCode[bolean] ) : Insertion du tableau contenant les données à mettre en cache. 
	// Si nom de fichier inexistant, un nouveau nommé $fileName sera créé lors du save(). Dans le cas contraire, les données sont écrasées
	public function setData($fileName, $var, $dataType = 0)
	{
		if(!isset($this->cache['data'][$fileName]))
			$this->checkFileExt($fileName, $dataType);
		if(!in_array($fileName, $this->cache['save']))
				$this->cache['save'][] = $fileName;

		$this->cache['data'][$fileName] = $var;
	}
	
	public function saveFiles($result = false)
	{
		foreach($this->cache['save'] as $fileName) 
		{ 
			switch($this->cache['file'][$fileName]) {
			case 0:
				$this->cache['data'][$fileName] = serialize($this->cache['data'][$fileName]);
				break;
			case 2:
				$this->cache['data'][$fileName] = gzcompress($this->cache['data'][$fileName]);
				break;
			default:
				NULL;
			};

			$saved[] = $this->saveData($fileName);
		}
		$this->cleanVars(false);
		if($result == true)
			return 'cacheSaved: '.implode(' ', $saved);
	}

/********** PARTIE 3 : Fonctions internes **********/

	// protected loadContent( string $fileName , [int $dataType = NULL], [boolean $rData = false] )
	protected function loadData($fileName, $dataType = NULL, $rData = false)
	{
		if(isset($dataType)):
			if(!$this->checkFileExt($fileName, $dataType)):
				return;
			endif;
		else:
			if(!$this->checkFile($fileName))
				 return;
		endif;
		
		switch($this->cache['file'][$fileName]) {
		case 0:
			$this->cache['data'][$fileName] = unserialize(file_get_contents($this->cacheDir.$fileName.$this->cacheExt[0]));
			break;
		case 1:
			require $this->cacheDir.$fileName.$this->cacheExt[1];
			$tmpName = $this->stringToVar($fileName);
			$this->cache['data'][$fileName] = $$tmpName;
			break;
		case 2:
			$this->cache['data'][$fileName] = gzuncompress(file_get_contents($this->cacheDir.$fileName.$this->cacheExt[2]));
			break;
		case 3:
			$this->cache['data'][$fileName] = file_get_contents($this->cacheDir.$fileName.$this->cacheExt[3]);
			break;
		default:
			NULL; // $this->cache['data'][$fileName] = $this->otherDataType();
		};

		if($rData == true)
			return $this->cache['data'][$fileName];
	}
	
	protected function saveData($fileName)
	{
		$fh = @fopen($this->cacheDir.$fileName.$this->cacheExt[$this->cache['file'][$fileName]], 'wb');
		if ($fh):
			if(is_array($this->cache['data'][$fileName]))
				fputs($fh, '<?php '."\n".'$'.$this->stringToVar($fileName).' = '.var_export($this->cache['data'][$fileName], true).'; '."\n".'?>');
			else
				fputs($fh, $this->cache['data'][$fileName]);
			return $fileName;
		endif;
		fclose($fh);
	}
	// protected stringToVar ( string $var )
	protected function stringToVar($var)
	{
		return self::varPFIX.preg_replace("/[^a-zA-Z0-9_]/","_", $var);
	}
	
	// protected checkFile( string $fileName )
	protected function checkFile($fileName)
	{
		foreach($this->cacheExt as $key => $ext)
		{
			if(file_exists($this->cacheDir.$fileName.$ext)):
				$this->cache['file'][$fileName] = $key;
				return true;
			endif;
		}
		return false;
	}
	
	// protected  checkFileExt( mixed $fileName, [int $dataType = NULL] )
	protected function checkFileExt($fileName, $dataType = NULL)
	{		
		if(!isset($dataType) or !array_key_exists($dataType, $this->cacheExt))
			return false;
		if(!is_array($fileName))
			$this->cache['file'][$fileName] = $dataType;
		else
			foreach($fileName as $tmpName)
			{
				$this->cache['file'][$tmpName] = $dataType;
			}
		return true;
	}
	
	// public checkFile ( string $fileName, int $dataType, [int $expire = 86400] )
	public function checkFileTime($fileName, $dataType, $expire = 86400) // default 86400=24h
	{
		if(!file_exists($this->cacheDir.$fileName.$this->cacheExt[$dataType]))
			return 0;
		$file =  filemtime($this->cacheDir.$fileName);
		$expire = $this->now - intval($expire);
		return ($file > $expire ? ($file-$expire) : 1);
	}
	// nettoyage
	public function cleanVars($all = true)
	{
		if ($all == true)
			$this->cache = array('file' => array(), 'data' => array(), 'save' => array());
		else
			$this->cache['save'] = array();
	}
	
	public function __sleep() 
	{
		$this->cleanVars(false);
		return array('cache');
	}
	
	public function __wakeup() 
	{
		return;
	}

} // class end
// preg_match('/a:[0-9]+:\{[aisb]+:(.*?)\}/', $file)
?>