package org.weblabs.wr.note;

import java.io.File;
import java.io.IOException;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.net.URI;

import java.util.ArrayList;
import java.util.prefs.Preferences;
import java.util.logging.*;

import org.weblabs.wr.util.Env;
import org.weblabs.wr.util.Net;

/**
 * handle note persistance by XML serialization.
 */
public class SimpleNoteConnection implements NoteConnection{
	private static final Logger logger = Env.getLogger(SimpleNoteConnection.class);

	public static final String NOTES_DIR_KEY     = "notesDir";
	public static final String NOTES_DIR_DEFAULT = "data/notes";

    private static Preferences prefs = Env.getPreferences(SimpleNoteConnection.class);
	private static String notesDirName = Env.getSetPref(prefs,NOTES_DIR_KEY,NOTES_DIR_DEFAULT);
	private static File notesDir;
	
	public NoteBox load(URI uri, int id) {
		File notesFile = getNotesFile(uri,id);
		NoteBox nb = null;
        try {
    		XMLDecoder d = new XMLDecoder(new BufferedInputStream(
                                  			  new FileInputStream(notesFile)));		
    		nb = (NoteBox) d.readObject();
			nb.setURI(uri.toString());
    		d.close();
		} catch (Exception e) {
	   	    logger.severe(e.toString());
		}		
		return nb;
	}
	
	public void save(URI uri, int id, NoteBox noteBox)
		   throws IOException
	{
		File notesFile = getNotesFile(uri,id);

		File tmpFile   = File.createTempFile("notes",null,notesDir);
   		XMLEncoder d = new XMLEncoder(new BufferedOutputStream(
                        			  new FileOutputStream(tmpFile)));		
   		d.writeObject(noteBox);
		d.close();
		notesFile.delete();
		//notesFile.createNewFile();
		tmpFile.renameTo(notesFile);	
	}  
	
	public static final File getNotesFile(URI uri, int id){
		init();
		String fname = toString(uri,id) + ".notes";
		return new File(notesDir,fname);
	} 
	
	public static String toString(URI uri){
		return uri.normalize().toASCIIString();
	} 

	public static String toString(URI uri, int id){
		String scheme = uri.getScheme();
		String host   = uri.getHost();
		
		StringBuffer sb = new StringBuffer(uri.normalize().toASCIIString());
		sb.append("^");
		sb.append(id);
		String s = sb.toString();
		if (null != scheme && scheme.length() > 0) {
		   s = s.substring(scheme.length()+2);
		   if (null != host && host.length() > 0 && Net.isLocalHost(uri)) {
		   	  s = s.substring(host.length()+1);
			  int p = uri.getPort();
			  if (p > 0) {
			  	 String ps = String.valueOf(p);
				 s = s.substring(ps.length()+1);
			  }  
		   }
		}
		
		s = s.replace('/','@').replace('\\','@').
			   	   						replace(':','%').replace(' ','_'); 
		return s;
	} 
	
	private static final void init() {
		if (null != notesDir) return;
		notesDir = new File(Env.getRoot(),notesDirName);
		notesDir.mkdirs();
	}
	
	protected File getNotesDir() {
		init();
		return notesDir;
	}
}