<?php // -*- indent-tabs-mode:nil -*-

/**
 * Maximum files to delete in a single cron run.
 */
define('FILECACHE_CRON_MAX_FILES', 10);

/**
 * Implements hook_cron().
 *
 * @see hook_cron()
 */
function filecache_cron() {

  if (!function_exists('filecache_directory')) {
    // filecache.inc is not included
    return;
  }

  $filecache_directory = filecache_directory();
  if ($filecache_directory === FALSE) {
    return;
  }

  // XXX just adapted from DrupalFileCache::delete_expired()

  $cache_size = 0;
  $cwd = getcwd();
  chdir($filecache_directory);
  $dh = opendir('.');
  while (($filename = readdir($dh)) !== FALSE) {
    // XXX this tries to read every file regardless if it's cache entry
    // XXX reads all entries XXX
    $content = @file_get_contents($filename);
    if ($content === FALSE) {
      continue; // some problem in reading but we don't care
    }
    $cache = @unserialize($content);
    if ($content === FALSE || !is_object($cache)) {
      continue; // broken file - don't remove it because it may not belong to us
    }

    // gather statistics
    $stat = @stat($filename);
    if ($stat === FALSE) {
      continue;
    }
    $cache_size += $stat['blocks'] >= 0 ? $stat['blocks']*512 : $stat['size'];

    if ($cache->expire == CACHE_PERMANENT) {
      continue;
    }
    $expiry_date = $cache->expire;
    if ($cache->expire == CACHE_TEMPORARY) {
      $expiry_date = $cache->created + variable_get('cache_lifetime', 0);
    }
    if ($expiry_date < REQUEST_TIME) {
      @unlink($filename);
    }
  } // foreach $filename
  closedir($dh);
  chdir($cwd);

  cache_set('filecache_space', array('cache_size' => $cache_size));
}

/**
 * Implements hook_requirements().
 *
 * @param $phase
 *   Phase.
 * @see hook_requirements()
 */
function filecache_requirements($phase) {

  $t = get_t();
  $requirements = array('title' => $t('File Cache'));
  $requirements['severity'] = REQUIREMENT_ERROR; // Assume error first
  $readme_hint = $t('Please follow instructions in %readme.',
                    array('%readme' => dirname(__FILE__) . '/README.txt'));

  if (!function_exists('filecache_directory')) {
    // filecache.inc is not included
    $requirements['value'] = $t('No File Cache setup in %settings.',
                                array('%settings' => conf_path() . '/settings.php'));
    $requirements['description'] = $readme_hint;
    return array('filecache' => $requirements);
  }

  $filecache_directory = filecache_directory();

  // Scan what cache bins we serve
  $default_bin = (variable_get('cache_default_class', '') == 'DrupalFileCache');
  $filecache_bins = array();
  $other_bins = array();
  global $conf;
  foreach ($conf as $key => $value) {
    if (strpos($key, 'cache_class_') === 0) {
      $bin = implode('_', array_slice(explode('_', $key), 2));
      if ($value == 'DrupalFileCache') {
        $filecache_bins[] = $bin;
      }
      else {
        $other_bins[] = $bin;
      }
    }
  }
  $filecache_bins = implode(', ', $filecache_bins);
  $other_bins = implode(', ', $other_bins);

  if (!$default_bin && empty($filecache_bins)) {
    $requirements['severity'] = REQUIREMENT_WARNING;
    $requirements['value'] = $t('No cache bins are served by File Cache.');
    $requirements['description'] = $readme_hint;
    return array('filecache' => $requirements);
  }

  // Show what cache bins we serve (in $requirements['value'])
  $requirements['severity'] = REQUIREMENT_OK;
  if ($default_bin) {
    if (empty($other_bins)) {
      $requirements['value'] =
        $t('All cache bins are served by File Cache.');
    }
    else {
      $requirements['value'] =
        $t('All cache bins except %bins are served by File Cache.',
	   array('%bins' => $other_bins));
    }
  }
  else {
    $requirements['value'] =
      $t('File Cache serves the following cache bins: %bins.',
	 array('%bins' => $filecache_bins));
  }

  // Show filecache_directory and its size (in $requirements['description'])
  $space = cache_get('filecache_space');
  $cron_last = variable_get('cron_last');
  if ($space) {
    $requirements['description'] =
      $t('File Cache directory %dir uses !size (!time ago)',
	 array('%dir' => $filecache_directory,
	       '!size' => format_size($space->data['cache_size']),
	       '!time' => format_interval(REQUEST_TIME - $cron_last)));
  }
  else {
    $requirements['description'] =
      $t('File Cache directory %dir uses unknown disk space. Run cron to update.',
	 array('%dir' => $filecache_directory));
  }

  return array('filecache' => $requirements);
}