<?php

/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * sfCacheConfigHandler allows you to configure cache.
 *
 * @package    symfony
 * @subpackage config
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id: sfCacheConfigHandler.class.php 9085 2008-05-20 01:53:23Z Carl.Vondrick $
 */
class sfCacheConfigHandler extends sfYamlConfigHandler
{
  protected
    $cacheConfig = array();

  /**
   * Executes this configuration handler.
   *
   * @param array $configFiles An array of absolute filesystem path to a configuration file
   *
   * @return string Data to be written to a cache file
   *
   * @throws <b>sfConfigurationException</b> If a requested configuration file does not exist or is not readable
   * @throws <b>sfParseException</b> If a requested configuration file is improperly formatted
   * @throws <b>sfInitializationException</b> If a cache.yml key check fails
   */
  public function execute($configFiles)
  {
    // parse the yaml
    $this->yamlConfig = self::getConfiguration($configFiles);

    // iterate through all action names
    $data  = array();
    $first = true;
    foreach ($this->yamlConfig as $actionName => $values)
    {
      if ($actionName == 'all')
      {
        continue;
      }

      $data[] = $this->addCache($actionName);

      $first = false;
    }

    // general cache configuration
    $data[] = $this->addCache('DEFAULT');

    // compile data
    $retval = sprintf("<?php\n".
                      "// auto-generated by sfCacheConfigHandler\n".
                      "// date: %s\n%s\n",
                      date('Y/m/d H:i:s'), implode('', $data));

    return $retval;
  }

  /**
   * Returns a single addCache statement.
   *
   * @param string $actionName  The action name
   *
   * @return string PHP code for the addCache statement
   */
  protected function addCache($actionName = '')
  {
    $data = array();

    // enabled?
    $enabled = $this->getConfigValue('enabled', $actionName);

    // cache with or without loayout
    $withLayout = $this->getConfigValue('with_layout', $actionName) ? 'true' : 'false';

    // lifetime
    $lifeTime = !$enabled ? '0' : $this->getConfigValue('lifetime', $actionName, '0');

    // client_lifetime
    $clientLifetime = !$enabled ? '0' : $this->getConfigValue('client_lifetime', $actionName, $lifeTime, '0');

    // contextual
    $contextual = $this->getConfigValue('contextual', $actionName) ? 'true' : 'false';

    // vary
    $vary = $this->getConfigValue('vary', $actionName, array());
    if (!is_array($vary))
    {
      $vary = array($vary);
    }

    // add cache information to cache manager
    $data[] = sprintf("\$this->addCache(\$moduleName, '%s', array('withLayout' => %s, 'lifeTime' => %s, 'clientLifeTime' => %s, 'contextual' => %s, 'vary' => %s));\n",
                      $actionName, $withLayout, $lifeTime, $clientLifetime, $contextual, str_replace("\n", '', var_export($vary, true)));

    return implode("\n", $data);
  }

  /**
   * @see sfConfigHandler
   */
  static public function getConfiguration(array $configFiles)
  {
    return self::flattenConfiguration(self::parseYamls($configFiles));
  }
}
