/*
    * Copyright (C) 2013 Room Work eXperience
    *
    * This program is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
    * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  package net.rwx.maven.asciidoc.services.impl;
  
  import java.io.BufferedOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import javax.xml.transform.Result;
  import javax.xml.transform.Source;
  import javax.xml.transform.Transformer;
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.stream.StreamResult;
  import javax.xml.transform.stream.StreamSource;
  import net.rwx.maven.asciidoc.backends.Backend;
  import net.rwx.maven.asciidoc.configuration.Document;
  import net.rwx.maven.asciidoc.services.TransformationService;
  import net.rwx.maven.asciidoc.utils.FileUtils;
  
  /**
   *
   * @author Arnaud Fonce <arnaud.fonce@r-w-x.net>
   */
  public class TransformationServiceImpl extends RootServiceImpl implements TransformationService {
  
      private String pathToXslFiles;
  
      public TransformationServiceImpl() throws IOException {
          ClassLoader loader = this.getClass().getClassLoader();
          InputStream is = loader.getResourceAsStream(ARCHIVE_NAME);
          pathToXslFiles = FileUtils.getTemporaryDirectory();
          FileUtils.uncompress(is, pathToXslFiles);
      }
  
      @Override
      public void execute(String inputPath, Document document, Backend backend) throws Exception {
          setOuputPath(inputPath, backend);
          if( backend.isIsTransformation()) {
              File xmlFile = new File(inputPath);
              File xsltFile = new File(getXsl(backend.getTransformationStylesheet()));
              File resultFile = new File(getOuputPath());
  
              Source xmlSource = new StreamSource(xmlFile);
              Source xsltSource = new StreamSource(xsltFile);
              Result result = new StreamResult(new BufferedOutputStream(new FileOutputStream(resultFile)));
  
              TransformerFactory transFact = TransformerFactory.newInstance();
              Transformer trans = transFact.newTransformer(xsltSource);
              trans.setParameter("paper.type", "A4");
  
              // TODO: will be used with images management - does not work yet
              /*String imgDir = new File(documentPath).getParentFile().getAbsolutePath();
              trans.setParameter("img.src.path", imgDir + "/");*/
              trans.transform(xmlSource, result);
          }
      }
  
      private String getXsl(String name) {
  
          StringBuilder builder = new StringBuilder();
          builder.append(pathToXslFiles);
          builder.append(File.separator);
          builder.append("docbook-xsl");
          builder.append(File.separator);
          builder.append(name);
  
          return builder.toString();
      }
  
      @Override
      protected void setOuputPath(String inputPath, Backend backend) {
          if( backend.isIsTransformation() ) {
              setOutputPath( inputPath, backend.getTransformationExtension() );
          }else {
              setOutputPath(inputPath);
          }
      }
  }