import java.io.*;

public class javamatlab {
  private static String OUTPUT_FILE_PATH = "c:\\";
  private static String OUTPUT_FILE = "out.m";
  private static String LOG_FILE_PATH = "c:\\";
  private static String LOG_FILE = "log.out";
  private static String MATLAB_LOCATION = "c:\\progra~1\\matlabr12.1\\bin\\matlab.exe";


  public static void main(String[] args) {
   String cmd = "";
   for (int i=0; i<args.length; i++) {
     if (args[i].equals("\\n"))
       cmd += "\n";
     else
       cmd += args[i];
   }
   javamatlab javamatlab = new javamatlab();
   System.out.println(javamatlab.runMatlab(cmd));
  }

  public String runMatlab(String cmd) {
    String line = "";     // each line read from the log file
    String output = "";      // output from the log file

    String logfile = LOG_FILE.substring(0,LOG_FILE.indexOf("."));
    String outfile = OUTPUT_FILE.substring(0,OUTPUT_FILE.indexOf("."));

    /* Delete the output file (if it exists) */
    File f = new File(OUTPUT_FILE_PATH + OUTPUT_FILE);
    if (f.exists() && f.canRead()) {
      f.delete();
    }

    /* Delete the log file (if it exists)*/
    f = new File(LOG_FILE_PATH + LOG_FILE);
    if (f.exists() && f.canRead()) {
      f.delete();
    }

    /* Write the command you sent to a file */
    try {
      PrintWriter out = new PrintWriter(new FileWriter(OUTPUT_FILE_PATH + OUTPUT_FILE));
      out.println("function " + logfile);
      out.println("diary('" + LOG_FILE_PATH + LOG_FILE +"');");
      out.println(cmd);
      out.println("diary off;");
      out.println("disp('Please close MATLAB to continue...')");
      out.close();
    } catch(IOException ex) {
      return("Couldn't write to data file");
    }

    /* Execute MATLAB, running that file */
    /* Don't continue until MATLAB closes */
    try {
      Process p = Runtime.getRuntime().exec(MATLAB_LOCATION + " -r " +  outfile);
      p.waitFor();
    } catch (IOException ex) {
      return("Cannot execute MATLAB");
    } catch(InterruptedException ex) {
    }

    /* Open up the log file, read the data */
    try {
      BufferedReader in = new BufferedReader(new FileReader(LOG_FILE_PATH + LOG_FILE));
      while ( (line = in.readLine()) != null) {
        output += line + "\n";
      }
      in.close();
    } catch (IOException ex) {
      return ("Error reading log file");
    }

    /* Delete the output file (we don't need it anymore*/
    f = new File(OUTPUT_FILE);
    if (f.exists() && f.canRead()) {
      f.delete();
    }

    /* Delete the log file (we don't need it anymore*/
    f = new File(LOG_FILE);
    if (f.exists() && f.canRead()) {
      f.delete();
    }

    return output;
  }
}