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package usda.weru.util;

import java.io.PrintWriter;
import java.io.StringWriter;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import org.apache.log4j.Logger;

/**
 *
 * @author Joseph Levin <joelevin@weru.ksu.edu>
 */
public class WepsExceptionHandler implements Thread.UncaughtExceptionHandler{

    @Override
    public void uncaughtException(Thread t, final Throwable e) {

        //Log the exception
        Logger logger;
        StackTraceElement[] trace = e.getStackTrace();
        if (trace.length > 0) {
            StackTraceElement topOfTheStack = trace[0];
            logger = Logger.getLogger(topOfTheStack.getClassName());
        } else {
            logger = Logger.getLogger(WepsExceptionHandler.class);
        }


        if (e instanceof OutOfMemoryError){
            Util.logMemoryUsage();            
            logger.warn("Out of memory.  Running garbage collector and attempting to recover.");
            Runtime.getRuntime().gc();
            Thread.yield();
            return;
        }
        else{
            logger.error("Unexpected Error", e);
        }

        Runnable task = new Runnable() {

            @Override
            public void run() {
                //
                int report = JOptionPane.showConfirmDialog(null, "An unexpected error was detected.\nWould you like to submit a bug report?", "Unexpected Error", JOptionPane.YES_NO_OPTION, JOptionPane.ERROR_MESSAGE);
                if (JOptionPane.YES_OPTION == report) {
                    //fill in the message with the stacktrace
                    StringWriter buffer = new StringWriter();
                    e.printStackTrace(new PrintWriter(buffer));
                    Mantis.message("Unexpected " + e.getClass().getSimpleName(), e.getMessage() + "\n" + buffer.toString(), (String[])null);
                }

            }
        };

        //Dispatch to the swing thread for handling the error reporting.
        if (!SwingUtilities.isEventDispatchThread()) {
            SwingUtilities.invokeLater(task);
        } else {
            task.run();
        }

    }
}