/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.apache.log4j.chainsaw.icons;
  
  import javax.swing.*;
  import javax.swing.plaf.metal.MetalLookAndFeel;
  import java.awt.*;
  import java.net.URL;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   */
  public class LevelIconFactory {
      private static final LevelIconFactory instance = new LevelIconFactory();
      private final Map<String, javax.swing.Icon> iconMap = new HashMap<>();
  
      private LevelIconFactory() {
          //reuse ERROR icon for FATAL level
          String[] iconFileNames =
              new String[]{"Warn.gif", "Inform.gif", "Error.gif", "Error.gif"};
          String[] iconLabels = new String[]{"WARN", "INFO", "ERROR", "FATAL"};
  
          for (int i = 0; i < iconLabels.length; i++) {
              URL resourceURL = UIManager.getLookAndFeel().getClass().getResource(
                  "icons/" + iconFileNames[i]);
              if (resourceURL == null) {
                  resourceURL = MetalLookAndFeel.class.getResource(
                      "icons/" + iconFileNames[i]);
              }
              if (resourceURL == null) {
                  iconMap.put(iconLabels[i], ChainsawIcons.ICON_DEBUG);
              } else {
  
                  final ImageIcon icon =
                      new ImageIcon(resourceURL);
                  double scalex = .5;
                  double scaley = .5;
                  final int newWidth = (int) (scalex * icon.getIconWidth());
                  final int newHeight = (int) (scaley * icon.getIconHeight());
                  Image iconImage =
                      icon.getImage().getScaledInstance(
                          newWidth, newHeight, Image.SCALE_SMOOTH);
                  iconMap.put(iconLabels[i], new ImageIcon(iconImage));
              }
          }
          //reuse DEBUG icon for TRACE level
          iconMap.put("TRACE", ChainsawIcons.ICON_DEBUG);
          iconMap.put("DEBUG", ChainsawIcons.ICON_DEBUG);
      }
  
      public static final LevelIconFactory getInstance() {
          return instance;
      }
  
      public Map<String, javax.swing.Icon> getLevelToIconMap() {
          return iconMap;
      }
  }