/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, 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.core.helpers.Transform;
  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.DEFAULT_CONVERTER_MAP;
      }
  
      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("\">");
         buf.append(Transform.escapeTags(c.convert(event)));
         buf.append("</td>");
         buf.append(LINE_SEPARATOR);
     }
 
     public IThrowableRenderer<ILoggingEvent> getThrowableRenderer() {
         return throwableRenderer;
     }
 
     public void setThrowableRenderer(IThrowableRenderer<ILoggingEvent> throwableRenderer) {
         this.throwableRenderer = throwableRenderer;
     }
 
     @Override
     protected String computeConverterName(Converter<ILoggingEvent> 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);
         }
     }
 }