/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.classic.html;
  
  import java.util.Map;
  
  import ch.qos.logback.classic.PatternLayout;
  import ch.qos.logback.classic.pattern.MDCConverter;
  import ch.qos.logback.classic.spi.ILoggingEvent;
  import ch.qos.logback.classic.html.DefaultCssBuilder;
  import ch.qos.logback.core.html.HTMLLayoutBase;
  import ch.qos.logback.core.html.IThrowableRenderer;
  import ch.qos.logback.core.pattern.Converter;
  import static ch.qos.logback.core.CoreConstants.LINE_SEPARATOR;
  
  /**
   * 
   * HTMLLayout outputs events in an HTML table. <p> The content of the table
   * columns are specified using a conversion pattern. See
   * {@link ch.qos.logback.classic.PatternLayout} for documentation on the
   * available patterns. <p> For more information about this layout, please refer
   * to the online manual at
   * http://logback.qos.ch/manual/layouts.html#ClassicHTMLLayout
   * 
   * @author Ceki G&uuml;lc&uuml;
   * @author S&eacute;bastien Pennec
   */
  public class HTMLLayout extends HTMLLayoutBase<ILoggingEvent> {
  
    /**
     * Default pattern string for log output.
     */
    static final String DEFAULT_CONVERSION_PATTERN = "%date%thread%level%logger%mdc%msg";
  
    IThrowableRenderer<ILoggingEvent> throwableRenderer;
  
    /**
     * Constructs a PatternLayout using the DEFAULT_LAYOUT_PATTERN.
     * 
     * The default pattern just produces the application supplied message.
     */
    public HTMLLayout() {
      pattern = DEFAULT_CONVERSION_PATTERN;
      throwableRenderer = new DefaultThrowableRenderer();
      cssBuilder = new DefaultCssBuilder();
    }
  
    @Override
    public void start() {
      int errorCount = 0;
      if (throwableRenderer == null) {
        addError("ThrowableRender cannot be null.");
        errorCount++;
      }
      if (errorCount == 0) {
        super.start();
      }
    }
  
    protected Map<String, String> getDefaultConverterMap() {
      return PatternLayout.defaultConverterMap;
    }
  
    public String doLayout(ILoggingEvent event) {
      StringBuilder buf = new StringBuilder();
      startNewTableIfLimitReached(buf);
  
      boolean odd = true;
      if (((counter++) & 1) == 0) {
        odd = false;
      }
  
      String level = event.getLevel().toString().toLowerCase();
  
      buf.append(LINE_SEPARATOR);
      buf.append("<tr class=\"");
      buf.append(level);
      if (odd) {
        buf.append(" odd\">");
      } else {
        buf.append(" even\">");
      }
      buf.append(LINE_SEPARATOR);
  
      Converter<ILoggingEvent> c = head;
      while (c != null) {
        appendEventToBuffer(buf, c, event);
        c = c.getNext();
     }
     buf.append("</tr>");
     buf.append(LINE_SEPARATOR);
 
     if (event.getThrowableProxy() != null) {
       throwableRenderer.render(buf, event);
     }
     return buf.toString();
   }
 
   private void appendEventToBuffer(StringBuilder buf,
       Converter<ILoggingEvent> c, ILoggingEvent event) {
     buf.append("<td class=\"");
     buf.append(computeConverterName(c));
     buf.append("\">");
     c.write(buf, event);
     buf.append("</td>");
     buf.append(LINE_SEPARATOR);
   }
 
   public IThrowableRenderer getThrowableRenderer() {
     return throwableRenderer;
   }
 
   public void setThrowableRenderer(IThrowableRenderer<ILoggingEvent> throwableRenderer) {
     this.throwableRenderer = throwableRenderer;
   }
   
   @Override
   protected String computeConverterName(Converter c) {
     if(c instanceof MDCConverter) {
       MDCConverter mc = (MDCConverter) c;
       String key = mc.getFirstOption();
       if(key != null) {
         return key;
       } else {
         return "MDC";
       }
     } else {    
       return super.computeConverterName(c);
     }
   }
 }