/**
    * 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.production;
  
  import info.magnolia.resourceloader.classpath.hierarchy.ClasspathFile;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  
  import org.apache.commons.lang3.StringUtils;
  import org.reflections.util.ClasspathHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.base.Objects;
  
  /**
   * {@link ClasspathFile} implementation oriented onto <strong>production application mode</strong>.
   *
   * <p>Communicates to the actual file via context {@link ClassLoader class loader}.</p>
   */
  public class ProductionModeClasspathFile implements ClasspathFile {
  
      private static final Logger log = LoggerFactory.getLogger(ProductionModeClasspathFile.class);
  
      private String classLoaderCompliantPath;
  
      private URL classpathUrl = null;
  
      public ProductionModeClasspathFile(String classLoaderCompliantPath) {
          this.classLoaderCompliantPath = classLoaderCompliantPath;
      }
  
      @Override
      public String getName() {
          return StringUtils.substringAfterLast(getAbsolutePath(), "/");
      }
  
      @Override
      public String getAbsolutePath() {
          return "/" + classLoaderCompliantPath;
      }
  
      @Override
      public InputStream openStream() throws IOException {
          return getUrl().openStream();
      }
  
      @Override
      public long getLastModified() {
          try {
              return getUrl().openConnection().getLastModified();
          } catch (IOException e) {
              log.warn("Failed to check the last modification date of a resource at [{}]: {}. Returning -1", getAbsolutePath(), e.getMessage());
              return -1;
          }
      }
  
      protected final URL getUrl() {
          if (classpathUrl == null) {
              classpathUrl = resolveUrl();
          }
          return classpathUrl;
      }
  
      protected final URL resolveUrl() {
          final URL resourceUrl = ClasspathHelper.contextClassLoader().getResource(classLoaderCompliantPath);
         if (resourceUrl == null) {
             throw new IllegalStateException(String.format("Failed to obtain resource URL at [%s] via context class loader, probably such resource does not exist...", this.classLoaderCompliantPath));
         }
         return this.classpathUrl = resourceUrl;
     }
 
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
 
         ProductionModeClasspathFile that = (ProductionModeClasspathFile) o;
 
         return Objects.equal(getAbsolutePath(), that.getAbsolutePath());
     }
 
     @Override
     public int hashCode() {
         return Objects.hashCode(getAbsolutePath());
     }
 }