import java.util.*;
import java.text.*;
import java.io.*;

/**
 * Reads info about environment variables from the .properties file
 *
 * @author aleman-meza, boanerges
 */

public class Environment
{

   private static final String PROPERTIES_FILE = "dev_environment.properties";
   private static final String PREFIX = "directory.";
   
   public static String HTML_DIRECTORY;
   public static String GNUPLOT;
   public static String PBM2GIF;
   public static String BASEURL;
   public static String SERVLET_UPLOAD;
   public static String SERVLET_GNUPLOT;
   public static String COLUMNS_DATA;
   public static String INDEX_HTML;
   private static String propertiesFileLocation;

   static
   {
      try { 
         // read a system property of interest. it is set when this is ran like:
         // java -Dproperties.dir=/somedirectory/ Environment
         propertiesFileLocation = System.getProperty( "properties.dir", "" );
         if( propertiesFileLocation != null && propertiesFileLocation != "" 
         && ! propertiesFileLocation.endsWith( File.separator ) ) {
            propertiesFileLocation = propertiesFileLocation + File.separator;
         }

         Properties prop = new Properties();
         prop.load( new FileInputStream( new File( propertiesFileLocation
         + PROPERTIES_FILE ) ) );

         HTML_DIRECTORY = prop.getProperty( "html.directory", 
                          "/home/aleman/public_html/" );
         if( ! HTML_DIRECTORY.endsWith( File.separator ) ) {
            HTML_DIRECTORY = HTML_DIRECTORY + File.separator;
         }

         GNUPLOT = prop.getProperty( "gnuplot", "/home/aleman/gnuplot" );

         PBM2GIF = prop.getProperty( "pbm2gif", 
                   "/home/aleman/pbm2gif" );

         BASEURL = prop.getProperty( "baseurl", 
         "http://gene.genetics.uga.edu/~aleman/" );
         if( ! BASEURL.endsWith( File.separator ) ) {
            BASEURL = BASEURL + File.separator;
         }

         SERVLET_UPLOAD = prop.getProperty( "servlet.upload", 
         "http://gene.genetics.uga.edu:8080/servlet/FileUploadServlet" );

         SERVLET_GNUPLOT = prop.getProperty( "servlet.gnuplot",
         "http://gene.genetics.uga.edu:8080/servlet/GnuplotServlet" );

         COLUMNS_DATA = prop.getProperty( "columns_data.file", "columns.data" );

         INDEX_HTML = prop.getProperty( "index_html.file", "index.html" );

         // rewrite the properties file to set the default values when
         // the propertiesFileLocation has some path on it. (this class 
         // was ran with something like -Dproperties.dir=/web/ab/ )
         if( propertiesFileLocation != null & propertiesFileLocation != "" ) {
            prop.setProperty( "html.directory", HTML_DIRECTORY );
            prop.setProperty( "gnuplot", GNUPLOT);
            prop.setProperty( "pbm2gif", PBM2GIF );
            prop.setProperty( "baseurl", BASEURL );
            prop.setProperty( "servlet.upload", SERVLET_UPLOAD );
            prop.setProperty( "servlet.gnuplot", SERVLET_GNUPLOT );
            prop.setProperty( "columns_data.file",  COLUMNS_DATA );
            prop.setProperty( "index_html.file", INDEX_HTML );
            prop.store( new FileOutputStream( new File( propertiesFileLocation
            + PROPERTIES_FILE ) ), null );
         }
      }
      catch( IOException ioe ) {
         String errmsg = "Environment: Error loading system properties";
         System.err.println( errmsg );
         errorReport( errmsg );
         ioe.printStackTrace();
         System.exit( -1 );
      }
   }

   private Environment()
   {
   }

   /**
    * Creates/Updates the 'home' html file
    * uses the info from the .properties file to create a link
    * per directory number
    */
   public static void createHtml()
   {
      try { 
         Properties prop = new Properties();
         prop.load( new FileInputStream( new File( propertiesFileLocation
         + PROPERTIES_FILE ) ) );
         PrintStream htmlFile = new PrintStream( new FileOutputStream( 
         new File( HTML_DIRECTORY + INDEX_HTML ) ) );
      
         htmlFile.println();
         htmlFile.println( "<html>" );
         htmlFile.println( "  <head>" );
         htmlFile.println( "   <title> All Plots </title>" );
         htmlFile.println( "   <META HTTP-EQUIV=\"Expires\" CONTENT=\""
         + "Tue Nov 28 16:49:34 EST 2000\">" );
         htmlFile.println( "  </head>" );
         htmlFile.println( "  <body text=\"#000000\" bgcolor=\"#FFFFFF\">" );
         htmlFile.println( "  <h3>Previously Uploaded Files :</h3>" );

         String desc = null;
         boolean none = true;
         DecimalFormat threeDigits = new DecimalFormat( "000" );
         for( int i = 1; i < 2000; i++ ) {
            desc = prop.getProperty( PREFIX + threeDigits.format( i ) );
            if( desc != null ) {
               htmlFile.println( "    <a href=\"" + BASEURL 
               + threeDigits.format( i ) + "\">" + desc + "</a><br>" );
               none = false;
            }
         }
         if( none ) {
            htmlFile.println( "    - no previously uploaded files - !<br>" );
         }

         htmlFile.println( "    <hr>" );
         htmlFile.println( "    <form enctype=\"multipart/form-data\" "
         + "method=\"POST\"" + " action=\"" + SERVLET_UPLOAD + "\">" );
         htmlFile.println( "      Upload datafile ( kin.o02 ) <br>" );
         htmlFile.println( "      File : <input type=\"file\" "
         + "name=\"datafile\"> <br>" );
         htmlFile.println( "      Description : <input type=\"text\" "
         + "name=\"description\" value=\"\"> <br>" );
         htmlFile.println( "    <input type=\"submit\">" );
         htmlFile.println( "  </form>" );
         htmlFile.println( "  <br>" );
         htmlFile.println( "  C++ Executable of kin <a " +
                           "href=\"kin_c\">kin_c</a>" );
 
         htmlFile.println( "  </body>" );
         htmlFile.println( "<html>" );
         htmlFile.close();
      }
      catch( IOException ioe ) {
         String errmsg = "Environment: Error creating html(" + HTML_DIRECTORY 
                         + INDEX_HTML + ")";
         System.err.println( errmsg );
         errorReport( errmsg );
         ioe.printStackTrace();
      }

   }
 
   /**
    * Adds an entry to the .properties file
    * an entry is a pair of ( directory, description )
    * @param  dirno  name of the directory
    * @param  description  description of the uploaded file
    */
   public static void addEntry( String dirno, String description )
   {
      try {
         if( description == null || description.trim().length() == 0 ) {
            description = "- no description -";
         }
         Properties prop = new Properties();
         prop.load( new FileInputStream( new File( PROPERTIES_FILE ) ) );
         prop.setProperty( PREFIX + dirno, description );
         prop.store( new FileOutputStream( new File( PROPERTIES_FILE ) ), null );
      }
      catch( IOException ioe ) {
         String errmsg = "Environment: Error adding entries to the system properties";
         System.err.println( errmsg );
         errorReport( errmsg );
         ioe.printStackTrace();
      }
   }


   /**
    * Error reporting routine <br>
    * Sends a e-mail to the developer
    * not implemented
    */
   public static void errorReport( String msg )
   {
      /*
      try {
         Process p = null;
         Runtime r = Runtime.getRuntime();
         String[] command = { "mail", "boanerg" };
         p = r.exec( command ); //"echo \"" + msg + "\" | mail boanerg" );
         int status = p.waitFor();
         System.err.println( "status = " + status );
      }
      catch( Exception e ) {
         e.printStackTrace();
      }
      */
   }

   /**
    * to be run only once to create some index.html file
    * sets the correct attribute for it
    */
   public static void main( String args[] )
   {
      createHtml();
      try {
         Process p = null;
         Runtime r = Runtime.getRuntime();
         p = r.exec( "chmod 755 " + HTML_DIRECTORY + INDEX_HTML );
         p.waitFor();
      }
      catch( Exception e ) {
         e.printStackTrace();
      }
   }

/*
# a default .properties file could be something like this
columns_data.file=columns.data
gnuplot=/usr/local/bin/gnuplot
pbm2gif=/home/grad/boanerg/genetics/test/pbm2gif
servlet.upload=http\://commerce.cs.uga.edu\:8080/servlet/FileUploadServlet
html.directory=/web/boanerg/public_html/stc/
servlet.gnuplot=http\://commerce.cs.uga.edu\:8080/servlet/GnuplotServlet
directory.001=big\ test
baseurl=http\://www.cs.uga.edu/~boanerg/stc/
index_html.file=index.html
*/

}