/**
    * This file Copyright (c) 2016 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.resourceloader.classpath.service.impl.devmode;
  
  import info.magnolia.resourceloader.classpath.hierarchy.ClasspathFile;
  import info.magnolia.resourceloader.classpath.service.impl.URLConnectionUtil;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.net.URLConnection;
  
  import org.reflections.util.ClasspathHelper;
  import org.reflections.vfs.Vfs;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.base.Objects;
  
  /**
   * {@link ClasspathFile} implementation oriented onto <strong>development application mode</strong>.
   *
   * <p>Communicates to the actual file via parent jar URL and {@link Vfs.File} descriptor.</p>
   */
  public class DevelopmentModeClasspathFile implements ClasspathFile {
  
      private static final Logger log = LoggerFactory.getLogger(DevelopmentModeClasspathFile.class);
  
      private URL classpathLocation;
      private Vfs.File jarFile;
  
      public DevelopmentModeClasspathFile(URL classpathLocation, Vfs.File jarFile) {
          this.classpathLocation = classpathLocation;
          this.jarFile = jarFile;
      }
  
      @Override
      public String getName() {
          return jarFile.getName();
      }
  
      @Override
      public String getAbsolutePath() {
          return "/" + jarFile.getRelativePath();
      }
  
      @Override
      public InputStream openStream() throws IOException {
          return jarFile.openInputStream();
      }
  
      @Override
      public long getLastModified() {
          URLConnection urlConnection = null;
          try {
              // If the resource file was in classpath from the very beginning - it'll probably be resolvable via
              // context class loader and we might get more precise last modification date.
              final URL resourceUrl = ClasspathHelper.contextClassLoader().getResource(jarFile.getRelativePath());
              if (resourceUrl != null) {
                  urlConnection = resourceUrl.openConnection();
              } else {
                  // Since the current strategy of resource content resolution is to look inside the jar contents
                  // the changed resources have the same last modification date as the jar which hosts them
                  urlConnection = classpathLocation.openConnection();
              }
  
              return urlConnection.getLastModified();
          } catch (IOException e) {
             log.warn("Failed to check the last modification date of a resource at {}, problems with establishing the connection with the jar file containing the resource [{}] resource: {}. Returning -1", getAbsolutePath(), classpathLocation, e.getMessage());
             return -1;
         } finally {
             URLConnectionUtil.closeURLConnection(urlConnection);
         }
     }
 
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
 
         DevelopmentModeClasspathFile that = (DevelopmentModeClasspathFile) o;
 
         return Objects.equal(getAbsolutePath(), that.getAbsolutePath());
     }
 
     @Override
     public int hashCode() {
         return Objects.hashCode(getAbsolutePath());
     }
 }