<?php

/**
 * @file
 * Install, update, and uninstall functions for the file_lock module
 */

/**
 * Implements hook_uninstall().
 */
function file_lock_uninstall() {
  variable_del('file_lock_mode');
  variable_del('file_lock_pattern');
  variable_del('file_lock_regex');
  variable_del('file_lock_hook');
  db_delete('file_usage')
    ->condition('module', 'file_lock')
    ->execute();
}

/**
 * Remove old variables
 */
function file_lock_update_7200() {
  variable_del('media_lock_mode');
  variable_del('media_lock_pattern');
  variable_del('media_lock_regex');
  variable_del('media_lock_hook');
}

/**
 * Unlock all temporary files.
 */
function file_lock_update_7201(&$sandbox) {
  // Initialize the batch progress.
  if (!isset($sandbox['progress'])) {
    $sandbox['progress'] = 0;
    $sandbox['last_fid_processed'] = -1;
    $sandbox['max'] = db_query('SELECT COUNT(*) FROM {file_managed} WHERE status = 0')->fetchField();
  }

  // Unlock up to 100 temporary files at a time.
  $fids = db_select('file_managed', 'f')
    ->fields('f', array('fid'))
    ->condition('status', 0)
    ->condition('fid', $sandbox['last_fid_processed'], '>')
    ->orderBy('fid', 'ASC')
    ->range(0, 100)
    ->execute()
    ->fetchCol();
  foreach ($fids as $fid) {
    $file = file_load($fid);
    file_lock_remove_lock($file);
    // Update the progress information for the batch update.
    $sandbox['progress']++;
    $sandbox['last_fid_processed'] = $fid;
  }

  // Indicate the current progress to the batch update system.
  if ($sandbox['progress'] < $sandbox['max']) {
    $sandbox['#finished'] = $sandbox['progress'] / $sandbox['max'];
  }
}