<?php
/**
 * patTemplate TemplateCache Wombat
 *
 * @package wombat
 * @author gERD Schaufelberger <gerd@php-toole.net>
 */

// WBClass::load('patTemplate_TemplateCache_File');
WBClass::load('patI18n');

/**
 * patTemplate TemplateCache Wombat
 *
 * Extends template cache File and add funcionality to check current locale settings
 *
 * @package wombat
 * @author gERD Schaufelberger <gerd@php-toole.net>
 */
class patTemplate_TemplateCache_Wombat extends patTemplate_TemplateCache
{
    /**
     * Load Template from Cache
     *
     * @param string cache key
     * @param integer modification time of original template
     * @return array|boolean either an array containing the templates or false cache could not be loaded
     */
    public function load($key, $modTime = -1)
    {
        if (1 > WBParam::get('wb/cache/use', 1)) {
            return false;
        }

        $filename = $this->getCachefileName($key);
        if (!file_exists($filename) || !is_readable($filename)) {
            return false;
        }

        $generatedOn    =   filemtime($filename);
        $ttl            =   $this->getParam('lifetime');
        if ($ttl == 'auto') {
            if ($modTime < 1) {
                return false;
            }
            if ($modTime > $generatedOn) {
                return false;
            }
            return unserialize(file_get_contents($filename));
        }

        if (!is_int($ttl)) {
            return false;
        }
        if ($generatedOn + $ttl < time()) {
            return false;
        }

        return unserialize( file_get_contents( $filename ) );
    }

    /**
     * Write Template to Cache
     *
     * @param string cache key
     * @param array templates to store
     * @return boolean true on success
     */
    public function write($key, $templates)
    {
        if (1 > WBParam::get('wb/cache/use', 1)) {
            return true;
        }

        $cacheFile  =   $this->getCachefileName($key);
        $fp         =   @fopen($cacheFile, 'w');
        if (!$fp) {
            return false;
        }

        flock($fp, LOCK_EX);
        fputs($fp, serialize($templates));
        flock($fp, LOCK_UN);
        $filemode   =   $this->getParam('filemode');
        if (null !== $filemode && false !== $filemode) {
            chmod($cacheFile, $filemode);
        }
        return true;
    }

   /**
    * get the cache filename
    *
    * @param string cache key
    * @return string cache file name
    */
    protected function getCachefileName($key)
    {
        return sprintf( '%s/%s%s-%s.cache'
                        , $this->getParam('cacheFolder')
                        , $this->getParam('prefix')
                        , patI18n::getLocale(patI18n::LOCALE_TYPE_LANG)
                        , $key);
    }
}