<?php
class Cache
{
	protected $maxTime = 8;
	protected $extension = '.tpl';
	protected $filename = null;
	protected $cache_loaded = false;
	protected $file_loaded;
	protected $cache = array();
	
	public function __construct($name = null)
	{
		$this->filename = APPLICATION_PATH.'/../cache/pages/'.$name.$this->extension;
	}
	
	public function exist()
	{
		//Fichier inexistant
		if ( !file_exists($this->filename) ) {
			return false;
		}
		//Ficher timeover
		if ( $this->timeover($this->filename) ) {
			return false;
		}
		return true;
	}
	
	public function setBlock($block, $array)
	{
		//Ajout des blocs sérialisés
		if(!empty($this->filename)){
			$data = $block.' = '.serialize($array);
			if( !$this->_writefile($data, $this->filename) ) {
				return true;
			}
		}
		return false;
	}
	
	public function getBlock($block)
	{
		$cache = $this->_readfile($this->filename);
		if(isset($cache[$block])){
			//Traitement
			$block = unserialize($cache[$block]);
			return $block;
		} else {
			return false;
		}
	}
	
	protected function timeover()
	{
		$dateFile = filemtime($this->filename);
		$now = mktime(date('G'), date('i'), date('s'), date("m") , date("d"), date("Y"));
		$maxTime = mktime(
			date('G',$dateFile)+$this->maxTime,
			date('i',$dateFile),
			date('s',$dateFile),
			date("m",$dateFile),
			date("d",$dateFile),
			date("Y",$dateFile));
		if( $now>$maxTime ) {
			return true;
		}
		return false;
	}
	
	public function deletefile()
	{
		if(file_exists($this->file))
			return unlink($this->file);
		else
			return false;
	}
	
	protected function _readfile()
	{
		if ( ($this->filename != $this->file_loaded) ) {
			$this->file_loaded = $this->filename;
			if (is_file($this->filename)) {
				$lines = file($this->filename);
				foreach ($lines as $line_num => $line) {
					list($key, $value) = explode(' = ', $line, 2);
					$cache[$key] = $value;
				}
			}
			$this->cache_loaded = true;
		}
		return $cache;
	}
	
	protected function _writefile($line)
	{
		$fp = fopen($this->filename,'a');
		$result = fwrite($fp,$line."\n");
		fclose($fp);
		return $result;
	}
}