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package org.webswing.toolkit.util;

import org.webswing.Constants;

import java.io.PrintWriter;
import java.io.StringWriter;

public class Logger {

	public static final int TRACE = 0;
	public static final int DEBUG = 1;
	public static final int INFO = 2;
	public static final int WARNING = 3;
	public static final int ERROR = 4;
	public static final int FATAL = 5;

	private static Logger log = new Logger();
	private int threshold = Integer.getInteger(Constants.SWING_START_SYS_PROP_LOG_LEVEL,2);

	public static void trace(String message, Object... o) {
		log(TRACE, "TRACE: " + message, o);
	}

	public static void debug(String message, Object... o) {
		log(DEBUG, "DEBUG: " + message, o);
	}

	public static void info(String message, Object... o) {
		log(INFO, "INFO: " + message, o);
	}

	public static void warn(String message, Object... o) {
		log(WARNING, "WARNING: " + message, o);
	}

	public static void error(String message, Object... o) {
		log(ERROR, "ERROR: " + message, o);
	}

	public static void fatal(String message, Object... o) {
		log(FATAL, "FATAL: " + message, o);
	}

	public static void log(int level, String message, Object... o) {
		if (log.threshold <= level) {
			if (o.length > 0) {
				StringBuilder sb = new StringBuilder(message);
				sb.append(" -> ");
				for (Object obj : o) {
					if (obj == null) {
						sb.append("null");
					} else if (obj instanceof Throwable) {
						StringWriter sw = new StringWriter();
						PrintWriter pw = new PrintWriter(sw);
						((Throwable) obj).printStackTrace(pw);
						sb.append(sw.toString());
					} else {
						sb.append(o.toString());
					}
					sb.append(" | ");
				}
				log.log(sb.toString());
			} else {
				log.log(message);
			}
		}
	}

	public static void setThreshold(int t) {
		log.threshold = t;
	}

	private void log(String s) {
		System.out.println(s);
	}
}