<?php

require_once SF_ROOT_DIR . '/lib/stSimpleShopDataCache.class.php';

class stLock
{
   const LOCK_BOOTSTRAP_PATH = '/web/errors/unavailable/bootstrap.php';
   const MAINTENANCE_LOCK = 'maintenance';
   const CACHE_LOCK = 'cache';

   public static function hasLock($app = SF_APP, $type = null, $maxLockTime = null)
   {
      $file = self::getLockFilePath($app, $type);

      return file_exists($file) && (null === $maxLockTime || null !== $maxLockTime && time() - filemtime($file) <= $maxLockTime);
   }

   public static function check($app = SF_APP, $environment = SF_ENVIRONMENT, $checkLicense = true, $type = null)
   {
      $phpVersion = floatval(phpversion());

      if ($phpVersion < 5.6 || $phpVersion > 7.5)
      {
         return false;
      }

      if ($phpVersion >= 7.2 && !self::isPHP72Ready())
      {
         return false;
      }

      if ($checkLicense)
      {
         if (!class_exists('stLicenseAbuse') && file_exists($file = SF_ROOT_DIR . '/lib/license/stLicenseAbuse.class.php'))
         {
            include_once($file);
         }

         if (class_exists('stLicenseAbuse') && stLicenseAbuse::isOff())
         {
            return false;
         }
      }

      if ($environment == 'dev')
      {
         return true;
      }

      if (isset($_REQUEST['open-key']) && $_REQUEST['open-key'] == md5_file(SF_ROOT_DIR . '/config/databases.yml'))
      {
         return true;
      }

      if (self::hasLock($app, $type))
      {
         return false;
      }

      return true;
   }

   public static function sentry($app = SF_APP, $environment = SF_ENVIRONMENT, $checkLicense = true)
   {
      $sc = stSimpleShopDataCache::getInstance();

      if (SF_APP == 'frontend' && !in_array($environment, array('dev', 'theme', 'edit')) && $sc->get('shop_locked') || !self::check($app, $environment, $checkLicense) || self::hasLock($app, self::MAINTENANCE_LOCK) || self::hasLock($app, self::CACHE_LOCK, 30))
      {
         include_once SF_ROOT_DIR . self::LOCK_BOOTSTRAP_PATH;
         exit;
      }
   }

   public static function isPHP72Ready($create = false)
   {
      $file = SF_ROOT_DIR . '/data/.php72ready';
      
      if ($create)
      {
         touch($file);
      }

      return is_file($file);
   }

   public static function getLockFilePath($app, $type = null)
   {
      return SF_ROOT_DIR . '/web/uploads/stLock' . self::getNamespace($app, $type) . '.lck';
   }

   public static function lock($app = SF_APP, $type = null)
   {
      $file = self::getLockFilePath($app, $type);
      
      if (!is_file($file))
      {
         file_put_contents($file, time());
      }
   }

   public static function wait($app = SF_APP, $wait = 3)
   {
      $time = time();
      $lock_file = self::getLockFilePath($app);
      while (is_file($lock_file) && time() - $time <= $wait)
      {
         usleep(300000);
      }
      self::unlock($app);
   }

   public static function unlock($app = SF_APP, $type = null)
   {
      $lockFile = self::getLockFilePath($app, $type);

      if (file_exists($lockFile))
      {
         unlink($lockFile);
      }
   }

   protected static function getNamespace($app, $type)
   {
      if (!class_exists('sfInflector'))
      {
         require_once SF_ROOT_DIR . '/lib/symfony/util/sfInflector.class.php';
      }

      return ucfirst(sfInflector::camelize($type ? $type . '_' . $app : $app));
   }
}