/*
 *   JSampler - a java front-end for LinuxSampler
 *
 *   Copyright (C) 2005-2007 Grigor Iliev <grigor@grigoriliev.com>
 *
 *   This file is part of JSampler.
 *
 *   JSampler is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *   as published by the Free Software Foundation.
 *
 *   JSampler is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with JSampler; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *   MA  02111-1307  USA
 */

package org.jsampler;

import java.beans.PropertyChangeSupport;

import java.io.BufferedReader;
import java.io.StringReader;

import java.util.Vector;
import java.util.prefs.Preferences;

/**
 *
 * @author Grigor Iliev
 */
public class JSPrefs extends PropertyChangeSupport {
	/**
	 * Property which specifies whether to apply default
	 * actions to newly created sampler channels.
	 */
	public final static String USE_CHANNEL_DEFAULTS = "samplerChannel.useDefaultActions";
	
	/**
	 * Property representing the default engine to be used when
	 * new sampler channel is created. The action is taken only if
	 * <code>USE_CHANNEL_DEFAULTS</code> is <code>true</code>.
	 */
	public final static String DEFAULT_ENGINE = "defaultEngine";
	
	/**
	 * Property representing the default MIDI input to be used when
	 * new sampler channel is created. The action is taken only if
	 * <code>USE_CHANNEL_DEFAULTS</code> is <code>true</code>.
	 */
	public final static String DEFAULT_MIDI_INPUT = "defaultMidiInput";
	
	/**
	 * Property representing the default audio output to be used when
	 * new sampler channel is created. The action is taken only if
	 * <code>USE_CHANNEL_DEFAULTS</code> is <code>true</code>.
	 */
	public final static String DEFAULT_AUDIO_OUTPUT = "defaultAudioOutput";
	
	/**
	 * Property representing the default MIDI input driver to be used
	 * when creating new MIDI input device.
	 */
	public final static String DEFAULT_MIDI_DRIVER = "defaultMidiDriver";
	
	/**
	 * Property representing the default audio output driver to be used
	 * when creating new audio output device.
	 */
	public final static String DEFAULT_AUDIO_DRIVER = "defaultAudioDriver";
	
	
	private final String pathName;
	private final Preferences userPrefs;
	
	/**
	 * Creates a new instance of <code>JSPrefs</code>.
	 * @param pathName The path name of the preferences node.
	 */
	public
	JSPrefs(String pathName) {
		super(new Object());
		
		this.pathName = pathName;
		userPrefs = Preferences.userRoot().node(pathName);
	}
	
	private Preferences
	user() { return userPrefs; }
	
	/**
	 * Gets a string property.
	 * @param name The name of the property.
	 * @return The value of the specified property.
	 * If the property is not set, the return value is <code>null</code>.
	 * @see #getDefaultStringValue
	 */
	public String
	getStringProperty(String name) {
		return getStringProperty(name, getDefaultStringValue(name));
	}
	
	/**
	 * Gets a string property.
	 * @param name The name of the property.
	 * @param defaultValue The value to return if the property is not set.
	 * @return The value of the specified property.
	 */
	public String
	getStringProperty(String name, String defaultValue) {
		return user().get(name, defaultValue);
	}
	
	/**
	 * Sets a string property.
	 * @param name The name of the property.
	 * @param s The new value for the specified property.
	 */
	public void
	setStringProperty(String name, String s) {
		String oldValue = getStringProperty(name);
		
		if(s == null) user().remove(name);
		else user().put(name, s);
		
		firePropertyChange(name, oldValue, s);
	}
	
	/**
	 * Gets the default value for the specified property.
	 * The default value is used when the property is not set.
	 * Override this method to provide custom default values for specific properties.
	 * @param name The name of the property whose default value should be obtained.
	 * @return <code>null</code>
	 * @see #getStringProperty(String name)
	 */
	public String
	getDefaultStringValue(String name) { return null; }
	
	/**
	 * Gets a string list property.
	 * @param name The name of the property.
	 * @return The value of the specified property.
	 * If the property is not set, the return value is an empty array.
	 * @see #getDefaultStringListValue
	 */
	public String[]
	getStringListProperty(String name) {
		return getStringListProperty(name, getDefaultStringListValue(name));
	}
	
	/**
	 * Gets a string list property.
	 * @param name The name of the property.
	 * @param defaultValue The value to return if the property is not set.
	 * @return The value of the specified property.
	 */
	public String[]
	getStringListProperty(String name, String[] defaultValue) {
		String s = user().get(name, null);
		if(s == null) return defaultValue;
		if(s.length() == 0) return new String[0];
		
		BufferedReader br = new BufferedReader(new StringReader(s));
		Vector<String> v = new Vector();
		
		try {
			s = br.readLine();
			while(s != null) {
				v.add(s);
				s = br.readLine();
			}
		} catch(Exception x) {
			x.printStackTrace();
		}
		
		return v.toArray(new String[v.size()]);
	}
	
	/**
	 * Sets a string list property.
	 * Note that the string elements may not contain new lines.
	 * @param name The name of the property.
	 * @param list The new value for the specified property.
	 */
	public void
	setStringListProperty(String name, String[] list) {
		String[] oldValue = getStringListProperty(name);
		
		if(list == null) user().remove(name);
		else {
			StringBuffer sb = new StringBuffer();
			for(String s : list) sb.append(s).append("\n");
			user().put(name, sb.toString());
		}
		
		firePropertyChange(name, oldValue, list);
	}
	
	/**
	 * Gets the default value for the specified property.
	 * The default value is used when the property is not set.
	 * Override this method to provide custom default values for specific properties.
	 * @param name The name of the property whose default value should be obtained.
	 * @return An empty array.
	 * @see #getStringListProperty(String name)
	 */
	public String[]
	getDefaultStringListValue(String name) { return new String[0]; }
	
	/**
	 * Gets an integer property.
	 * @param name The name of the property.
	 * @return The value of the specified property.
	 * @see #getDefaultIntValue
	 */
	public int
	getIntProperty(String name) {
		return getIntProperty(name, getDefaultIntValue(name));
	}
	
	/**
	 * Gets an integer property.
	 * @param name The name of the property.
	 * @param defaultValue The value to return if the property is not set.
	 * @return The value of the specified property.
	 */
	public int
	getIntProperty(String name, int defaultValue) {
		return user().getInt(name, defaultValue);
	}
	
	/**
	 * Gets the default value for the specified property.
	 * The default value is used when the property is not set.
	 * Override this method to provide custom default values for specific properties.
	 * @param name The name of the property whose default value should be obtained.
	 * @return <code>0</code>
	 * @see #getIntProperty(String name)
	 */
	public int
	getDefaultIntValue(String name) { return 0; }
	
	/**
	 * Sets an integer property.
	 * @param name The name of the property.
	 * @param i The new value for the specified property.
	 */
	public void
	setIntProperty(String name, int i) {
		int oldValue = getIntProperty(name);
		user().putInt(name, i);
		firePropertyChange(name, oldValue, i);
	}
	
	
	/**
	 * Gets a boolean property.
	 * @param name The name of the property.
	 * @return The value of the specified property.
	 * @see #getDefaultBoolValue
	 */
	public boolean
	getBoolProperty(String name) {
		return getBoolProperty(name, getDefaultBoolValue(name));
	}
	/**
	 * Gets a boolean property.
	 * @param name The name of the property.
	 * @param defaultValue The value to return if the property is not set.
	 * @return The value of the specified property.
	 */
	public boolean
	getBoolProperty(String name, boolean defaultValue) {
		return user().getBoolean(name, defaultValue);
	}
	
	/**
	 * Sets a boolean property.
	 * @param name The name of the property.
	 * @param b The new value for the specified property.
	 */
	public void
	setBoolProperty(String name, boolean b) {
		boolean oldValue = getBoolProperty(name);
		user().putBoolean(name, b);
		firePropertyChange(name, oldValue, b);
	}
	
	/**
	 * Gets the default value for the specified property.
	 * The default value is used when the property is not set.
	 * Override this method to provide custom default values for specific properties.
	 * @param name The name of the property whose default value should be obtained.
	 * @return <code>false</code>
	 * @see #getBoolProperty(String name)
	 */
	public boolean
	getDefaultBoolValue(String name) { return false; }
}