import java.io.*;
import javax.swing.*;

public class ErrorLog extends PrintStream {

  static String errorfilename = "error.txt";
  static int maxerrors = 10;
  static int excount = 0;
  static PrintStream okstream = null;

  static boolean showwarnings = true;

  public ErrorLog(PrintStream okstream) {
    super(new LogStream(okstream));
    this.okstream = okstream;
  }

  public static void flushLog() {
    okstream.flush();
  }

  public void logMessage() {
    okstream.println("This file is used by carto to store error information.");
    okstream.println("There is no cause for alarm,");
    okstream.println("even if this file contains lots of cryptic error messages.");
    okstream.println("The information is for debugging purposes only.\n");
//    okstream.print("Carto  version info:\n"+Carto.runversion.getAbout()+"\n");
//+" Compiled "+Version.date);
//    okstream.println("Java runtime: " + System.getProperty("java.version"));
//    okstream.println("RunID = "+Persist.current.getRunID()+"\n");  }
  }

  public ErrorLog() throws FileNotFoundException {
    this(new PrintStream(new FileOutputStream(errorfilename)));
  }

  static public void exception(Throwable e) {
    if (excount++ < maxerrors) {
      if (showwarnings) log("Exception "+e);
      okstream.println("----------------");
      e.printStackTrace(okstream);
    }
  }

  static public void exception(Throwable e,String msg) {
    log(msg);
    exception(e);
  }

  static public void exception(String msg) {
    Exception e = new Exception(msg);
    exception(e);
  }

  static public void log(String msg) {
    JOptionPane.showMessageDialog(null,
				  msg+"\nThe file 'error.txt' may give more details",
				  "Carto Error",
				  JOptionPane.ERROR_MESSAGE);
    okstream.println("----------------");
    okstream.println(msg);
  }

  static public void logOK(String msg) {
    JOptionPane.showMessageDialog(null,
				  msg,
				  "Carto Message",
				  JOptionPane.INFORMATION_MESSAGE);
    okstream.println("----------------");
    okstream.println(msg);
  }
}