/**
    * 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.base;
  
  import info.magnolia.resourceloader.classpath.hierarchy.ClasspathEntry;
  import info.magnolia.resourceloader.classpath.service.impl.devmode.DevelopmentModeClasspathFile;
  import info.magnolia.resourceloader.classpath.service.impl.legacy.LegacyClasspathFile;
  import info.magnolia.resourceloader.classpath.service.impl.production.ProductionModeClasspathFile;
  
  import java.net.URL;
  
  import org.reflections.vfs.Vfs;
  
  /**
   * Strategy class which helps to build {@linkplain ClasspathEntry classpath files} from some arbitrary context.
   * <p>
   * Provides three default implementations (based on {@link Vfs}) for dev, production and legacy modes.
   */
  public abstract class ClasspathFileConstructionStrategy {
  
      public abstract ClasspathEntry buildFile(Object... args);
  
      public static ClasspathFileConstructionStrategy productionWithVfs() {
          return new ProductionModeConstructionStrategy();
      }
  
      public static ClasspathFileConstructionStrategy legacyWithVfs() {
          return new LegacyResourcesConstructionStrategy();
      }
  
      public static ClasspathFileConstructionStrategy developmentModeWithVfs() {
          return new DevelopmentModeConstructionStrategy();
      }
  
      private static class ProductionModeConstructionStrategy extends ClasspathFileConstructionStrategy {
          @Override
          public ClasspathEntry buildFile(Object... args) {
              if (!(args[0] instanceof Vfs.File)) {
                  throw new IllegalStateException(String.format("Vfs.file has to be provided before %s construction", ProductionModeClasspathFile.class.getSimpleName()));
              }
              String relativePath = ((Vfs.File) args[0]).getRelativePath();
              if (relativePath == null) {
                  throw new IllegalStateException(String.format("Path has to be specified before %s construction", ProductionModeClasspathFile.class.getSimpleName()));
              }
  
              return createClasspathEntry(relativePath);
          }
  
          protected ProductionModeClasspathFile createClasspathEntry(String relativePath) {
              return new ProductionModeClasspathFile(relativePath);
          }
      }
  
      private static class LegacyResourcesConstructionStrategy extends ProductionModeConstructionStrategy {
          @Override
          protected ProductionModeClasspathFile createClasspathEntry(String relativePath) {
              return new LegacyClasspathFile(relativePath);
          }
      }
  
      private static class DevelopmentModeConstructionStrategy extends ClasspathFileConstructionStrategy {
          @Override
          public ClasspathEntry buildFile(Object... args) {
              if (!(args[0] instanceof Vfs.File)) {
                  throw new IllegalStateException(String.format("Vfs.file has to be provided before %s construction", DevelopmentModeClasspathFile.class.getSimpleName()));
              }
              if (!(args[1] instanceof URL)) {
                  throw new IllegalStateException(String.format("Classpath location has to be specified before %s construction", DevelopmentModeClasspathFile.class.getSimpleName()));
             }
 
             final Vfs.File jarFile = (Vfs.File) args[0];
             final URL classpathLocation = (URL) args[1];
             return new DevelopmentModeClasspathFile(classpathLocation, jarFile);
         }
     }
 }