<?php
class SaleCache
{
    private $cache_id = '';
    private $smarty = null;
    private $max_filemtime = 0;
    private $template_path = '';
    private $path_cache_file = '';

    function __construct($smarty, $cache_prefix, $lifetime = 7200) // 2 Hours
    {
        $d = new DateTime();

        if (isset($_SERVER['QUERY_STRING'])) {
            $cache_prefix .= $_SERVER['QUERY_STRING'];
        }
        $this->cache_id = md5("private_sales_".$cache_prefix."_".$d->format('Ymd'));
        $this->max_filemtime = $d->getTimestamp() - $lifetime;
        $this->path_cache_file = __DIR__.'/../cache/'.$this->cache_id;
        $this->smarty = $smarty;
    }

    function __destruct()
    {
        if (!empty($this->template_path && $this->smarty)) {
            file_put_contents($this->path_cache_file, $this->smarty->fetch($this->template_path));
        }
    }

    function isCached($template_path)
    {
        if (file_exists($this->path_cache_file) && filemtime($this->path_cache_file) > $this->max_filemtime) {
            return true;
        }

        $this->template_path = $template_path;
        return false;
    }

    function getCache()
    {
        return file_get_contents($this->path_cache_file);
    }

    static function clearAll()
    {
        foreach(glob(__DIR__.'/../cache/*') as $path_file) {
	    if (preg_match('/index\.php$/', $path_file)===1) {
                continue;
            }
	    @unlink($path_file);
        }
    }
}