/*
    * 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;
  
  import java.awt.BorderLayout;
  import java.text.MessageFormat;
  import java.util.Date;
  import javax.swing.BorderFactory;
  import javax.swing.JEditorPane;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTable;
  import javax.swing.ListSelectionModel;
  import javax.swing.event.ListSelectionEvent;
  import javax.swing.event.ListSelectionListener;
  import org.apache.log4j.Logger;
  
  /**
   * A panel for showing a stack trace.
   *
   * @author <a href="mailto:oliver@puppycrawl.com">Oliver Burn</a>
   */
  class DetailPanel
      extends JPanel
      implements ListSelectionListener
  {
      /** used to log events **/
      private static final Logger LOG =
          Logger.getLogger(DetailPanel.class);
  
      /** used to format the logging event **/
      private static final MessageFormat FORMATTER = new MessageFormat(
          "<b>Time:</b> <code>{0,time,medium}</code>" +
          "&nbsp;&nbsp;<b>Priority:</b> <code>{1}</code>" +
          "&nbsp;&nbsp;<b>Thread:</b> <code>{2}</code>" +
          "&nbsp;&nbsp;<b>NDC:</b> <code>{3}</code>" +
          "<br><b>Logger:</b> <code>{4}</code>" +
          "<br><b>Location:</b> <code>{5}</code>" +
          "<br><b>Message:</b>" +
          "<pre>{6}</pre>" +
          "<b>Throwable:</b>" +
          "<pre>{7}</pre>");
  
      /** the model for the data to render **/
      private final MyTableModel mModel;
      /** pane for rendering detail **/
      private final JEditorPane mDetails;
  
      /**
       * Creates a new <code>DetailPanel</code> instance.
       *
       * @param aTable the table to listen for selections on
       * @param aModel the model backing the table
       */
      DetailPanel(JTable aTable, final MyTableModel aModel) {
          mModel = aModel;
          setLayout(new BorderLayout());
          setBorder(BorderFactory.createTitledBorder("Details: "));
  
          mDetails = new JEditorPane();
          mDetails.setEditable(false);
          mDetails.setContentType("text/html");
          add(new JScrollPane(mDetails), BorderLayout.CENTER);
  
          final ListSelectionModel rowSM = aTable.getSelectionModel();
          rowSM.addListSelectionListener(this);
      }
  
      /** @see ListSelectionListener **/
      public void valueChanged(ListSelectionEvent aEvent) {
          //Ignore extra messages.
          if (aEvent.getValueIsAdjusting()) {
              return;
          }
  
          final ListSelectionModel lsm = (ListSelectionModel) aEvent.getSource();
          if (lsm.isSelectionEmpty()) {
              mDetails.setText("Nothing selected");
          } else {
              final int selectedRow = lsm.getMinSelectionIndex();
              final EventDetails e = mModel.getEventDetails(selectedRow);
              final Object[] args =
              {
                  new Date(e.getTimeStamp()),
                  e.getPriority(),
                 escape(e.getThreadName()),
                 escape(e.getNDC()),
                 escape(e.getCategoryName()),
                 escape(e.getLocationDetails()),
                 escape(e.getMessage()),
                 escape(getThrowableStrRep(e))
             };
             mDetails.setText(FORMATTER.format(args));
             mDetails.setCaretPosition(0);
         }
     }
 
     ////////////////////////////////////////////////////////////////////////////
     // Private methods
     ////////////////////////////////////////////////////////////////////////////
 
     /**
      * Returns a string representation of a throwable.
      *
      * @param aEvent contains the throwable information
      * @return a <code>String</code> value
      */
     private static String getThrowableStrRep(EventDetails aEvent) {
         final String[] strs = aEvent.getThrowableStrRep();
         if (strs == null) {
             return null;
         }
 
         final StringBuffer sb = new StringBuffer();
         for (int i = 0; i < strs.length; i++) {
             sb.append(strs[i]).append("\n");
         }
 
         return sb.toString();
     }
 
     /**
      * Escape &lt;, &gt; &amp; and &quot; as their entities. It is very
      * dumb about &amp; handling.
      * @param aStr the String to escape.
      * @return the escaped String
      */
     private String escape(String aStr) {
         if (aStr == null) {
             return null;
         }
 
         final StringBuffer buf = new StringBuffer();
         for (int i = 0; i < aStr.length(); i++) {
             char c = aStr.charAt(i);
             switch (c) {
             case '<':
                 buf.append("&lt;");
                 break;
             case '>':
                 buf.append("&gt;");
                 break;
             case '\"':
                 buf.append("&quot;");
                 break;
             case '&':
                 buf.append("&amp;");
                 break;
             default:
                 buf.append(c);
                 break;
             }
         }
         return buf.toString();
     }
 }