/**
    * This file Copyright (c) 2011-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.setup.for5_2;
  
  import info.magnolia.init.MagnoliaConfigurationProperties;
  import info.magnolia.module.InstallContext;
  import info.magnolia.module.delta.AbstractCondition;
  import info.magnolia.objectfactory.Components;
  
  import java.lang.reflect.Method;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A {@link info.magnolia.module.delta.Condition} prohibiting to install in problematic environments - unless explicitly allowed.
   */
  public class IsNotAProblematicEnvironmentCondition extends AbstractCondition {
      private static final Logger log = LoggerFactory.getLogger(IsNotAProblematicEnvironmentCondition.class);
  
      public static final String MAGNOLIA_ALLOW_PROBLEMATIC_ENVIRONMENT = "magnolia.allow.problematic.environment";
  
      static final String SYSTEM_PROPERTY_OS_NAME = "os.name";
      static final String SYSTEM_PROPERTY_JAVA_VERSION = "java.version";
  
      final MagnoliaConfigurationProperties magnoliaConfigurationProperties;
  
      public IsNotAProblematicEnvironmentCondition() {
          this(Components.getComponent(MagnoliaConfigurationProperties.class));
      }
  
      @Inject
      public IsNotAProblematicEnvironmentCondition(final MagnoliaConfigurationProperties magnoliaConfigurationProperties) {
          super("Environment check", "See http://documentation.magnolia-cms.com/display/DOCS/Problematic+environments for more details.");
          this.magnoliaConfigurationProperties = magnoliaConfigurationProperties;
      }
  
      @Override
      public boolean check(InstallContext installContext) {
          if (!magnoliaConfigurationProperties.getBooleanProperty(MAGNOLIA_ALLOW_PROBLEMATIC_ENVIRONMENT)) {
              final String osName = System.getProperty(SYSTEM_PROPERTY_OS_NAME);
              final String javaVersion = System.getProperty(SYSTEM_PROPERTY_JAVA_VERSION);
  
              if (osName.endsWith("OS X") && (javaVersion.startsWith("1.7") || javaVersion.startsWith("1.8"))) {
  
                  String updateNumberString = StringUtils.substringAfter(javaVersion, "_");
                  if (StringUtils.isNotBlank(updateNumberString)) {
                      try {
                          Short updateNumber = Short.parseShort(updateNumberString);
                          if ((javaVersion.startsWith("1.7") && updateNumber >= 65) || (javaVersion.startsWith("1.8") && updateNumber >= 11)) {
                              return true;
                          }
                      } catch (NumberFormatException e) {
                          log.error("Invalid update number [{}] continue with determination of AS to be on the safe side.", updateNumberString);
                      }
                  }
  
                  // check for Tomcat
                  Class serverInfo;
                  try {
                      serverInfo = Class.forName("org.apache.catalina.util.ServerInfo");
                  } catch (ClassNotFoundException e) {
                      // it's not tomcat - we're fine!
                      return true;
                  }
 
                 // version check on Tomcat
                 try {
                     final Method method = serverInfo.getMethod("getServerNumber");
                     final Object versionObject = method.invoke(null);
                     if (versionObject != null) {
                         String specificationVersion = versionObject.toString();
                         if (StringUtils.isNotEmpty(specificationVersion) && (specificationVersion.startsWith("6.") || specificationVersion.startsWith("7."))) {
                             installContext.warn("Running " + osName + " with Java " + javaVersion + " and " + "Apache Tomcat" + " " + specificationVersion + " has known issues. Use property '" + MAGNOLIA_ALLOW_PROBLEMATIC_ENVIRONMENT + "=true' to allow this combination at your own risk.");
                             return false;
                         }
                     }
                 } catch (Exception e) {
                     log.error("Could not determine version of Tomcat server - stopping installation to be on the safe side.", e);
                     return false;
                 }
             }
         }
         return true;
     }
 }