/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.codehaus.groovy.tools.shell.util;

import java.util.prefs.BackingStoreException;
import java.util.prefs.PreferenceChangeListener;
import java.util.prefs.PreferenceChangeEvent;

import org.codehaus.groovy.tools.shell.IO;

/**
 * Container for shell preferences.
 *
 * @version $Id$
 * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
 */
public class Preferences
{
    private static final java.util.prefs.Preferences STORE = java.util.prefs.Preferences.userRoot().node("/org/codehaus/groovy/tools/shell");

    public static IO.Verbosity verbosity;

    static {
        String tmp = STORE.get("verbosity", IO.Verbosity.INFO.name);
        try {
            verbosity = IO.Verbosity.forName(tmp);
        }
        catch (IllegalArgumentException e) {
            verbosity = IO.Verbosity.INFO;
            STORE.remove("verbosity");
        }

        addChangeListener(new PreferenceChangeListener() {
            public void preferenceChange(final PreferenceChangeEvent event) {
                if (event.getKey().equals("verbosity")) {
                    String name = event.getNewValue();

                    if (name == null) {
                        name = IO.Verbosity.INFO.name;
                    }

                    try {
                        verbosity = IO.Verbosity.forName(name);
                    }
                    catch (Exception e) {
                        event.getNode().put(event.getKey(), verbosity.name);
                    }
                }
            }
        });
    }

    public static boolean getShowLastResult() {
        return STORE.getBoolean("show-last-result", true);
    }

    public static boolean getSanitizeStackTrace() {
        return STORE.getBoolean("sanitize-stack-trace", true);
    }

    public static String getEditor() {
        return STORE.get("editor", System.getenv("EDITOR"));
    }

    public static String getParserFlavor() {
        return STORE.get("parser-flavor", "rigid");
    }

    //
    // Store Access
    //
    
    public static String[] keys() throws BackingStoreException {
        return STORE.keys();
    }

    public static String get(final String name, final String defaultValue) {
        return STORE.get(name, defaultValue);
    }

    public static String get(final String name) {
        return get(name, null);
    }

    public static void put(final String name, final String value) {
        STORE.put(name, value);
    }

    public static void clear() throws BackingStoreException {
        STORE.clear();
    }

    public static void addChangeListener(final PreferenceChangeListener listener) {
        STORE.addPreferenceChangeListener(listener);
    }
}