/**
    * This file Copyright (c) 2011 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.module.groovy.task;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.StringWriter;
  import java.net.URL;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import groovy.lang.Binding;
  import groovy.lang.GroovyRuntimeException;
  import info.magnolia.cms.util.ClasspathResourcesUtil;
  import info.magnolia.module.InstallContext;
  import info.magnolia.module.delta.AbstractTask;
  import info.magnolia.module.delta.TaskExecutionException;
  import info.magnolia.module.groovy.console.MgnlGroovyConsole;
  
  
  /**
   * This Task execute a groovy file against the groovy console. File is define as a String.
   *
   * @version $Id$
   */
  public class ExecuteGroovyFileTask extends AbstractTask {
  
      // Init Global
      private static final Logger log = LoggerFactory.getLogger(ExecuteGroovyFileTask.class);
  
      private MgnlGroovyConsole console;
  
      private String inputFile;
  
      public ExecuteGroovyFileTask(String taskName, String taskDescription, String inputFile) {
          super(taskName, taskDescription);
          this.inputFile = inputFile;
      }
  
      @Override
      public void execute(InstallContext installContext) throws TaskExecutionException {
          try {
              // Init
              console = new MgnlGroovyConsole(new Binding());
              // Run the GroovyFile against the Groovy Console
              executeGroovyScript(installContext);
          }
          catch (Exception e) {
              throw new TaskExecutionException("Could not execute the groovy File '" + inputFile +"': " + e.getMessage(), e);
          }
      }
  
      private void executeGroovyScript(InstallContext installContext) throws Exception {
  
          // Check
          if (this.inputFile == null) {
              throw new IOException("Input File is Null");
          }
  
          // First Check
          URL inFile = ClasspathResourcesUtil.getResource(this.inputFile);
          if (inFile == null) {
              throw new IOException("Can't find resource file at " + this.inputFile);
          }
          // Get Input Stream
          final InputStream inputStream = ClasspathResourcesUtil.getResource(this.inputFile).openStream();
         if (inputStream == null) {
             throw new IOException("Can't find resource file at " + inFile.getFile());
         }
 
         Object lastResult = null;
         StringWriter outputStream = new StringWriter();
         try {
             lastResult = console.evaluate(inputStream, (new File(inFile.getFile())).getName(), outputStream);
             // Shows the result of the evaluated code
             if (lastResult != null) {
                 outputStream.getBuffer().append(lastResult);
             }
             outputStream.flush();
             installContext.info(outputStream.toString());
         }
         catch (GroovyRuntimeException e) {
             log.error("Got a Groovy Execution Error", e);
             throw e;
         }
         finally {
             outputStream.close();
             inputStream.close();
         }
     }
 }