package no.uio.ifi.refaktor.utils;

import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.FileHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

import org.eclipse.core.runtime.Platform;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.CompositeChange;
import org.eclipse.text.edits.TextEdit;

public class RefaktorDebug {
	
	static {
		createLogger();
	}
	
	private static final String DEBUG_ARG = "-refaktordebug";
	private static boolean debug = false;
	private static PrintStream out;
	private static Logger logger;
	
	public static void initialize() {
		out = System.err;
		Set<String> args = new HashSet<String>(Arrays.asList(Platform.getApplicationArgs()));
		debug = args.contains(DEBUG_ARG);
		println("(Refaktor Debug active)");
	}
	
	public static void println(Object o) {
		println(o.toString());
	}
	
	public static void print(Object o) {
		print(o.toString());
	}
	
	public static void println(String str) {
		if (!debug)
			return;
		
		out.println(str);
	}
	
	public static void print(String str) {
		if (!debug)
			return;
		
		out.print(str);
	}
	
	public static void printChange(Change change, Set<Change> s, int i) {
		if (!debug)
			return;
		
		s.add(change);
		println("Level " + i++ + ": " + change.getClass());
		CompositeChange c = (CompositeChange) change.getAdapter(CompositeChange.class);
		if (c != null) {
			for(Change ch: c.getChildren()) {
				if (!s.contains(ch))
					printChange(ch, s, i);
			}
		}
	}
	
	public static void printTextEdit(TextEdit edit, int i) {
		if (!debug)
			return;
		
		println(i++ + ": " + edit.getClass());
		for (TextEdit t: edit.getChildren()) 
			printTextEdit(t, i);
		
	}

	public static void log(String string) {
		logger.log(Level.SEVERE, string);
	}

	private static void createLogger() {
		logger = Logger.getLogger(RefaktorDebug.class.getCanonicalName());
		logger.setLevel(Level.ALL);

		File homeDir = new File(System.getProperty("user.home"));
		File loggingDir = new File(homeDir, "no.uio.ifi.refaktor.logs");

		if (!loggingDir.exists())
			loggingDir.mkdir();

		try {
			Handler handler = new FileHandler(loggingDir.getAbsolutePath() + "/no.uio.ifi.refaktor.%g.log", true);
			handler.setFormatter(new SimpleFormatter());
			logger.addHandler(handler);
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}