/*
  neon-adoc - Asciidoctor extensions to Neon
  Copyright (C) 2024  Ulrich Hilger

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.uhilger.neon.adoc;

import java.io.File;
import org.asciidoctor.Asciidoctor;
import static org.asciidoctor.Asciidoctor.Factory.create;
import org.asciidoctor.Attributes;
import org.asciidoctor.Options;
import org.asciidoctor.SafeMode;

/**
 * Objekte der Klasse AdocWorker wandeln Asciidoc-Quelldateien in HTML und PDF um.
 * 
 * @author Ulrich Hilger
 */
public class AdocWorker {
  
  /**
   * Nach HTML transformieren
   * @param fileName der Dateiname der Quelldatei samt absoluter Pfadangabe
   */
  public void transform(String fileName) {
    transform(fileName, null);
  }  
  
  /**
   * In ein Format transformieren, das von einem 'Backend' von Asciidoctor 
   * unterstuetzt wird
   * @param fileName der Dateiname der Quelldatei samt absoluter Pfadangabe
   * @param backend das Kuerzel des Backends, z.B. der String 'pdf', wenn 
   * nach PDF transformiert werden soll
   */
  public void transform(String fileName, String backend) {    
    Attributes attributes;
    File outFile = new File(fileName);
    String thisDirName = outFile.getParent();
    File pdfStyles = new File(outFile.getParentFile(), "custom-theme.yml");
    if(pdfStyles.exists()) {
      attributes = Attributes.builder()
              .attribute("pdf-themesdir", thisDirName)
              .attribute("pdf-theme","custom")
              .attribute("pdf-fontsdir", thisDirName + "/fonts")
              .attribute("allow-uri-read")
              .sourceHighlighter("highlightjs")
              .build();
    } else {
      attributes = Attributes.builder()
              .sourceHighlighter("highlightjs")
              .build();
    }
    Options options;
    if(null != backend) {
      options = Options.builder()
              .inPlace(false)
              .safe(SafeMode.SERVER)
              .backend(backend).attributes(attributes).build();
      
    } else {
      options = Options.builder()
              .inPlace(false)
              .safe(SafeMode.SERVER)
              .attributes(attributes).build();
    }
    
    File adcf = new File(fileName);
    Asciidoctor asciidoctor = create();    
    asciidoctor.requireLibrary("asciidoctor-diagram");
    asciidoctor.convertFile(adcf, options);    
  }  
}