package org.openslx.dozmod.gui.helper;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.border.BevelBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

import org.apache.log4j.Appender;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Priority;
import org.apache.log4j.spi.LoggingEvent;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.openslx.dozmod.gui.Gui;

@SuppressWarnings("serial")
public class DebugWindow extends JPanel {

	private static final DateTimeFormatter formatter = DateTimeFormat.forPattern("HH:mm:ss");

	private final JTextPane txtLog;

	public DebugWindow() {
		setLayout(new BorderLayout());
		txtLog = new JTextPane();
		txtLog.setEditable(false);
		txtLog.setBackground(Color.WHITE);
		txtLog.setForeground(Color.BLACK);
		txtLog.setBorder(new EmptyBorder(new Insets(5, 5, 5, 5)));
		JScrollPane sp = new JScrollPane(txtLog, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
				JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
		sp.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
		add(sp, BorderLayout.CENTER);
		registerLogger();
		validate();
	}

	private void registerLogger() {
		Appender appender = new AppenderSkeleton() {

			@Override
			public boolean requiresLayout() {
				return false;
			}

			@Override
			public void close() {
				// Nothing to do
			}

			@Override
			protected void append(final LoggingEvent event) {
				final Level l = event.getLevel();
				final Color c;
				if (l.isGreaterOrEqual(Priority.ERROR)) {
					c = Color.RED;
				} else if (l.isGreaterOrEqual(Priority.WARN)) {
					c = Color.ORANGE;
				} else if (l.isGreaterOrEqual(Priority.INFO)) {
					c = Color.BLACK;
				} else {
					c = Color.GRAY;
				}
				Gui.asyncExec(new Runnable() {
					@Override
					public void run() {

						log("[" + formatter.print(event.getTimeStamp()) + "] ", Color.BLACK);
						log(event.getThreadName() + "@" + event.getLoggerName().replaceAll("^.*\\.", ""),
								Color.GRAY);
						log("  " + event.getMessage() + "\n", c);
					}
				});
			}
		};
		BasicConfigurator.configure(appender);
	}

	private void log(String msg, Color c) {
		StyledDocument doc = txtLog.getStyledDocument();
		SimpleAttributeSet keyWord = new SimpleAttributeSet();
		StyleConstants.setForeground(keyWord, c);
		try {
			doc.insertString(doc.getLength(), msg, keyWord);
		} catch (BadLocationException e) {
			e.printStackTrace(); // Do not use LOGGER here to prevent infinite loop
		}
		txtLog.setCaretPosition(doc.getLength());
	}

}