/**

  * Copyright 2009 Timothy Johnston 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 com.timjohnstondev.unitconverter.logic;

 import java.util.ResourceBundle;

 import java.util.prefs.Preferences;

 import javax.swing.ListModel;

 import com.timjohnstondev.unitconverter.Launcher;

 /**

  * Utility class that contains all of the logic for maintaining the user preferences.

  */

 public final class ConfigurationLogic

 {

   private static final ResourceBundle RESOURCES = ResourceBundle

       .getBundle("com.timjohnstondev.unitconverter.view.View");

   private ConfigurationLogic()

   {}

   /**

    * Returns the index of the item provided in the {@code ListModel}.

    * 

    * @param model list

    * @param unitSeparator separator

    * @return index

    */

   public static int getPreferenceIndex(final ListModel model, final String unitSeparator)

   {

     int sepIndex = 0;

     for (int i = 0; i < model.getSize(); i++)

     {

       if (model.getElementAt(i).equals(unitSeparator))

       {

         sepIndex = i;

       }

     }

     return sepIndex;

   }

   /**

    * Looks into the JVM preference storage location for the unit separator. If the unit separator symbol setting is

    * found, it is used, else the default is used.

    * 

    * @return the unit separator symbol stored in the JVM preference storage or the default

    */

   public static String getUnitSeparatorPreference()

   {

     final Preferences userPref = Preferences.userNodeForPackage(Launcher.class);

     final String prefValue = userPref.get(RESOURCES.getString("UnitConverter.prefKeyUnitSeparator"), "");

     final String unitSeparator = prefValue != null ? prefValue : "\"*\"";

     return unitSeparator;

   }

   /**

    * Puts a unit separator symbol preference into the JVM preference storage location.

    * 

    * @param symbol unit separator symbol

    */

   public static void setUnitSeparatorPreference(final String symbol)

   {

     final Preferences userPref = Preferences.userNodeForPackage(Launcher.class);

     userPref.put(RESOURCES.getString("UnitConverter.prefKeyUnitSeparator"), symbol);

   }

   /**

    * Looks into the JVM preference storage location for the {@code Font} size. If the {@code Font} size setting is

    * found, it is used, else the system default is used.

    * 

    * @param defaultFontSize the default font size

    * @return the {@code Font} size stored in the JVM preference storage or the system default

    */

   public static int getFontSizePreference(final int defaultFontSize)

   {

     final Preferences userPref = Preferences.userNodeForPackage(Launcher.class);

     final String prefValue = userPref.get(RESOURCES.getString("UnitConverter.prefKeyFontSize"), "");

     int fontSize = defaultFontSize;

     try

     {

       fontSize = Integer.parseInt(prefValue);

     }

     catch (NumberFormatException e)

     {

       e.getMessage();

     }

     return fontSize;

   }

   /**

    * Puts a font size preference into the JVM preference storage location.

    * 

    * @param fontSize the font size

    */

   public static void setFontSizePreference(final int fontSize)

   {

     final Preferences userPref = Preferences.userNodeForPackage(Launcher.class);

     userPref.put(RESOURCES.getString("UnitConverter.prefKeyFontSize"), String.valueOf(fontSize));

   }

 }