package org.djunits.generator;
   
   import java.io.BufferedReader;
   import java.io.File;
   import java.io.FileNotFoundException;
   import java.io.FileReader;
   import java.io.PrintWriter;
   import java.net.URISyntaxException;
   import java.net.URL;
  
  /**
   * GenerateXSD makes an XSD file for all choices possible with the units, using the textual representations. <br>
   * <br>
   * Copyright (c) 2003-2018 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
   * for project information <a href="https://www.simulation.tudelft.nl/" target="_blank">www.simulation.tudelft.nl</a>. The
   * source code and binary code of this software is proprietary information of Delft University of Technology.
   * @author <a href="https://www.tudelft.nl/averbraeck" target="_blank">Alexander Verbraeck</a>
   */
  public class GenerateXSD
  {
      /** The output folder of the writer -- will be written in Eclipse project-root/generated-code/org/djunits folder. */
      private static final String generatedCodeRelativePath = "/generated-code/";
  
      /**
       * The calculated absolute output path (root of the executable or Jar file). In case of an Eclipse run, ../../ is added to
       * the path to place the results in the root of the project, rather than in target/classes.
       */
      private static String absoluteRootPath;
  
      /**
       * @param args String[]; not used
       * @throws FileNotFoundException in case we cannot find the djunits project
       */
      public static void main(final String[] args) throws FileNotFoundException
      {
          makeAbsolutePath();
          makeXsd();
          // TODO: makeAdapters();
      }
  
      /** */
      private static void makeXsd()
      {
          try
          {
              File in = new File(absoluteRootPath + "../../djunits/src/main/resources/localeunit.properties");
              if (!in.exists())
              {
                  throw new RuntimeException("cannot find file " + in.getPath());
              }
              BufferedReader br = new BufferedReader(new FileReader(in));
  
              File outPath = new File(absoluteRootPath + "/resources");
              outPath.mkdirs();
              PrintWriter pw = new PrintWriter(absoluteRootPath + "/resources/djunits.xsd");
              pw.write(
                      "<?xml version=\"1.0\" encoding=\"UTF-8\"?> <xsd:schema targetNamespace=\"http://www.djunits.org/djunits\"\n");
              pw.write("  xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"\n");
              pw.write("  xmlns:djunits=\"http://www.djunits.org/djunits\"\n");
              pw.write("  xmlns=\"http://www.djunits.org/djunits\" elementFormDefault=\"qualified\">\n");
              pw.write("\n");
              pw.write("  <!-- ========================================================================================= -->\n");
              pw.write("  <!-- ==================================== DJUNITS UNIT TYPES ================================= -->\n");
              pw.write("  <!-- ========================================================================================= -->\n");
              pw.write("\n");
  
              String typeStr = "";
              String line = br.readLine();
              while (line != null)
              {
                  if (line.startsWith("#"))
                  {
                      line = br.readLine();
                      continue;
                  }
  
                  if (line.contains("="))
                  {
                      typeStr = writeType(pw, line, typeStr);
                  }
                  line = br.readLine();
              }
  
              if (typeStr.length() > 0)
              {
                  pw.write(")\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n");
              }
  
              pw.write("  <!-- ========================================================================================= -->\n");
              pw.write("  <!-- ================================== DJUNITS SCALAR TYPES ================================= -->\n");
              pw.write("  <!-- ========================================================================================= -->\n");
              pw.write("\n");
  
              br.close();
              br = new BufferedReader(new FileReader(in));
              typeStr = "";
              line = br.readLine();
              while (line != null)
              {
                 if (line.startsWith("#"))
                 {
                     line = br.readLine();
                     continue;
                 }
 
                 if (line.contains("="))
                 {
                     typeStr = writeScalar(pw, line, typeStr, false);
                 }
                 line = br.readLine();
             }
 
             if (typeStr.length() > 0)
             {
                 pw.write(")\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n");
             }
 
             pw.write("  <!-- ========================================================================================= -->\n");
             pw.write("  <!-- ============================= DJUNITS POSITIVE SCALAR TYPES ============================= -->\n");
             pw.write("  <!-- ========================================================================================= -->\n");
             pw.write("\n");
 
             br.close();
             br = new BufferedReader(new FileReader(in));
             typeStr = "";
             line = br.readLine();
             while (line != null)
             {
                 if (line.startsWith("#"))
                 {
                     line = br.readLine();
                     continue;
                 }
 
                 if (line.contains("="))
                 {
                     typeStr = writeScalar(pw, line, typeStr, true);
                 }
                 line = br.readLine();
             }
 
             if (typeStr.length() > 0)
             {
                 pw.write(")\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n" + "</xsd:schema>\n");
             }
             pw.close();
             br.close();
 
             System.out.println("built: " + absoluteRootPath + "/resources/djunits.xsd");
 
         }
         catch (Exception exception)
         {
             exception.printStackTrace();
         }
     }
 
     /** indicate first unit, so no |. */
     static boolean first;
      
     /**
      * Write a scalar with unit to the file, with or without [+-]?
      * @param pw PrintWriter; the file to write to
      * @param typeStrOrig String; the previous the unit we were looking at
      * @param line String; the line from the preoperties file
      * @param plus boolean; with or without [+-]?
      * @return the unit we are looking at
      */
     private static String writeScalar(final PrintWriter pw, final String line, final String typeStrOrig, final boolean plus)
     {
         /*-
         <xsd:simpleType name="SPEEDTYPE"> 
           <xsd:restriction base="xsd:string">
             <xsd:pattern value="\d+\.?\d*\s*(km/h|m/s|mi/h|ft/s)"></xsd:pattern>
           </xsd:restriction>
         </xsd:simpleType>
         */
 
         if (line.startsWith("Dimension"))
         {
             return typeStrOrig;
         }
 
         String typeStr = typeStrOrig;
         String key = line.split("=")[0].trim().split("\\.")[0];
         String val = line.split("=")[1].trim();
         String[] vals = val.split("\\|");
         if (!typeStr.equals(key))
         {
             // new type
             if (typeStr.length() > 0)
             {
                 if (typeStr.startsWith("Dimension"))
                     pw.write("\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n");
                 else
                     pw.write(")\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n");
             }
             typeStr = key;
             String type = key.toUpperCase() + "TYPE";
             if (plus)
             {
                 type = "POSITIVE" + type;
             }
             pw.write("  <xsd:simpleType name=\"" + type + "\">\n");
             pw.write("     <xsd:restriction base=\"xsd:string\">\n");
             String plusmin = plus ? "" : "[+-]?";
             if (type.contains("DIMENSIONLESS"))
                 pw.write("      <xsd:pattern value=\"" + plusmin + "[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?\\s*");
             else
                 pw.write("      <xsd:pattern value=\"" + plusmin + "[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?\\s*(");
             first = true;
         }
         else
         {
             if (!first)
                 pw.write("|");
             first = false;
             pw.write(escape(vals[0]));
             for (int i = 2; i < vals.length; i++)
                 pw.write("|" + escape(vals[i]));
         }
         System.out.println(vals[0]);
         return typeStr;
     }
 
     /**
      * Write a unit type to the file
      * @param pw PrintWriter; the file to write to
      * @param typeStrOrig String; the previous the unit we were looking at
      * @param line String; the line from the preoperties file
      * @return the unit we are looking at
      */
     private static String writeType(final PrintWriter pw, final String line, final String typeStrOrig)
     {
         /*-
           <xsd:simpleType name="SPEEDUNITTYPE">
             <xsd:restriction base="xsd:string">
               <xsd:pattern value="(m/s|km/h|mi/h|ft/s|kt|m/h|km/s|mi/min|in/min|ft/min|ft/h|mi/s|in/h|in/s)"></xsd:pattern>
             </xsd:restriction>
           </xsd:simpleType>
         */
 
         if (line.startsWith("Dimension"))
         {
             return typeStrOrig;
         }
 
         String typeStr = typeStrOrig;
         String key = line.split("=")[0].trim().split("\\.")[0];
         String val = line.split("=")[1].trim();
         String[] vals = val.split("\\|");
         if (!typeStr.equals(key))
         {
             // new type
             if (typeStr.length() > 0)
             {
                 pw.write(")\"></xsd:pattern>\n" + "    </xsd:restriction>\n" + "  </xsd:simpleType>\n\n");
             }
             typeStr = key;
             String type = key.toUpperCase() + "UNITTYPE";
             pw.write("  <xsd:simpleType name=\"" + type + "\">\n");
             pw.write("     <xsd:restriction base=\"xsd:string\">\n");
             pw.write("      <xsd:pattern value=\"(");
             first = true;
         }
         else
         {
             if (!first)
                 pw.write("|");
             first = false;
             pw.write(escape(vals[0]));
             for (int i = 2; i < vals.length; i++)
                 pw.write("|" + escape(vals[i]));
         }
         System.out.println(vals[0]);
         return typeStr;
     }
 
     /** the characters to escape. */
     private static final String escape = "(){}.?|<>*-+'\\%^";
 
     /**
      * @param s String; the String to escape
      * @return the String with \ before escaped chars
      */
     private static String escape(String s)
     {
         String out = "";
         for (char c : s.toCharArray())
         {
             if (escape.indexOf(c) >= 0)
                 out += "\\";
             if (c == '"')
                 out += "&quot;";
             else
                 out += c;
         }
         return out.trim();
     }
 
     /**
      * Determine calculated absolute output path (root of the executable or Jar file). In case of an Eclipse run, ../../ is
      * added to the path to place the results in the root of the project, rather than in target/classes.<br>
      * See https://weblogs.java.net/blog/kohsuke/archive/2007/04/how_to_convert.html and
      * http://stackoverflow.com/questions/320542/how-to-get-the-path-of-a-running-jar-file and
      * http://stackoverflow.com/questions/3153337/get-current-working-directory-in-java
      * @throws FileNotFoundException in case file could not be found
      */
     private static void makeAbsolutePath() throws FileNotFoundException
     {
         URL mainURL = URLResource.getResource("/");
         String path;
         try
         {
             path = mainURL.toURI().getPath();
         }
         catch (URISyntaxException exception)
         {
             path = mainURL.getPath();
         }
         if (path.endsWith("/target/classes/"))
         {
             path = path.substring(0, path.length() - "/target/classes/".length());
         }
         path += generatedCodeRelativePath;
         if (!new File(path).exists())
         {
             new File(path).mkdirs();
         }
         absoluteRootPath = path;
         System.out.println("writing into: " + path);
     }
 }