/*
    * Copyright 2007 Markku Saarela 
    * 
    * 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 net.sourceforge.jivalo.editor.key;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Properties;
  
  import javax.swing.KeyStroke;
  
  /**
   * @author <a href="mailto:ivalo@iki.fi">Markku Saarela</a>
   *
   */
  public final class CustomKeyBinding
  {
  
      /**
       * Name of key bindings
       */
      private String name;
  
      private String keyBindingFileName;
  
      private Map keyBindings;
  
      /**
       * @param name
       * @param keyBindingFileName
       * @throws NullPointerException if name or keyBindingFileName is null.
       */
      public CustomKeyBinding( String name, String keyBindingFileName )
      {
          super();
          if ( keyBindingFileName == null )
          {
              throw new NullPointerException( "keyBindingFileName" );
          }
          if ( name == null )
          {
              throw new NullPointerException( "name" );
          }
  
          this.keyBindingFileName = keyBindingFileName;
          this.name = name;
      }
  
      public Map getKeyBindings()
      {
          if ( this.keyBindings == null )
          {
              this.keyBindings = getBindings();
          }
  
          return this.keyBindings;
      }
  
      /**
       * @return
       */
      private Map getBindings()
      {
          
          HashMap map = new HashMap();
  
          Properties properties = getProperties();
          
          for ( Iterator iter = properties.entrySet().iterator(); iter.hasNext(); )
          {
              Map.Entry element = ( Map.Entry ) iter.next();
              
              String actionName = ( ( String )element.getKey() ).trim();
              
              String keyStroke = ( ( String )element.getValue() ).trim();
              
              KeyAction keyAction = 
                  DefaultEditorKitActionFactory.getAction( actionName );
              
              KeyStroke key = getKeyStroke( keyStroke );
              
             if ( keyAction != null && key != null )
             {
                 map.put( key, keyAction.getAction() );
             }
         }
         
         return map;
     }
 
     /**
      * @param keyStroke
      * @return
      */
     private KeyStroke getKeyStroke( String keyStroke )
     {
         
         KeyStroke key = null;
         
         String[] strings = keyStroke.split( "," );
 
         KeyCode keyCode = KeyEventKeyCodeFactory.getKeyCode( strings[0].trim() );
         
         if ( keyCode != null )
         {
             int modifiers = 0;
 
             if ( strings.length == 2 )
             {
                 String[] masks = strings[1].trim().split( "[|]" );
                 
                 InputEventKeyModifier[] keyModifiers = 
                     new InputEventKeyModifier[masks.length];
                 
                 for ( int i = 0; i < masks.length; i++ )
                 {
                     keyModifiers[i] = InputEventKeyModifier.valueOf( masks[i].trim() );
                     modifiers = modifiers | keyModifiers[i].getModifier();
                 }
             }
             
             key = KeyStroke.getKeyStroke( keyCode.getKeyCode(), modifiers );      
         }
 
         return key;
     }
 
     private Properties getProperties()
     {
 
         InputStream is = null;
 
         if ( this.keyBindingFileName.startsWith( "/" ) )
         {
             is = this.getClass().getResourceAsStream( this.keyBindingFileName );
         }
         else
         {
             File file = new File( this.keyBindingFileName );
 
             try
             {
                 is = new FileInputStream( file );
             }
             catch ( FileNotFoundException e )
             {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
 
         Properties props = new Properties();
 
         if ( is != null )
         {
             try
             {
                 props.load( is );
             }
             catch ( IOException e )
             {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
 
         return props;
     }
 
     /**
      * @see java.lang.Object#toString()
      */
     public String toString()
     {
         return this.name;
     }
 
 }