/*
    * 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.myfaces.tobago.internal.renderkit.renderer;
  
  import org.apache.myfaces.tobago.component.SupportFieldId;
  import org.apache.myfaces.tobago.context.Markup;
  import org.apache.myfaces.tobago.internal.component.AbstractUILabel;
  import org.apache.myfaces.tobago.internal.util.AccessKeyLogger;
  import org.apache.myfaces.tobago.internal.util.HtmlRendererUtils;
  import org.apache.myfaces.tobago.renderkit.LabelWithAccessKey;
  import org.apache.myfaces.tobago.renderkit.RendererBase;
  import org.apache.myfaces.tobago.renderkit.css.BootstrapClass;
  import org.apache.myfaces.tobago.renderkit.css.TobagoClass;
  import org.apache.myfaces.tobago.renderkit.html.HtmlAttributes;
  import org.apache.myfaces.tobago.renderkit.html.HtmlElements;
  import org.apache.myfaces.tobago.util.ComponentUtils;
  import org.apache.myfaces.tobago.webapp.TobagoResponseWriter;
  
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIInput;
  import javax.faces.context.FacesContext;
  import javax.faces.event.ComponentSystemEvent;
  import javax.faces.event.ComponentSystemEventListener;
  import javax.faces.event.ListenerFor;
  import javax.faces.event.PostAddToViewEvent;
  import java.io.IOException;
  
  @ListenerFor(systemEventClass = PostAddToViewEvent.class)
  public class LabelRenderer<T extends AbstractUILabel> extends RendererBase<T> implements ComponentSystemEventListener {
  
    @Override
    public void processEvent(final ComponentSystemEvent event) {
      ComponentUtils.evaluateAutoFor(event.getComponent(), UIInput.class);
    }
  
    @Override
    public void encodeEndInternal(final FacesContext facesContext, final T component) throws IOException {
  
      final TobagoResponseWriter writer = getResponseWriter(facesContext);
      final UIComponent corresponding = ComponentUtils.findFor(component);
      final String forId;
      if (corresponding instanceof SupportFieldId) {
        forId = ((SupportFieldId) corresponding).getFieldId(facesContext);
      } else {
        forId = corresponding != null ? corresponding.getClientId(facesContext) : null;
      }
      final String clientId = component.getClientId(facesContext);
      final Markup markup = component.getMarkup();
      final boolean required;
      if (corresponding instanceof UIInput) {
        required = ((UIInput) corresponding).isRequired();
      } else {
        required = false;
      }
  
      writer.startElement(HtmlElements.LABEL);
      HtmlRendererUtils.writeDataAttributes(facesContext, writer, component);
      writer.writeClassAttribute(
          BootstrapClass.COL_FORM_LABEL,
          TobagoClass.LABEL.createMarkup(markup),
          required ? TobagoClass.REQUIRED : null,
          component.getCustomClass());
      writer.writeIdAttribute(clientId);
      if (forId != null) {
        writer.writeAttribute(HtmlAttributes.FOR, forId, false);
      }
      final String title = HtmlRendererUtils.getTitleFromTipAndMessages(facesContext, component);
      if (title != null) {
        writer.writeAttribute(HtmlAttributes.TITLE, title, true);
      }
  
      encodeTextContent(facesContext, writer, component);
  
      writer.endElement(HtmlElements.LABEL);
    }
  
    /**
     * Encodes the text inside of the label.
     * Can be overwritten in other themes.
     */
    protected void encodeTextContent(
        final FacesContext facesContext, final TobagoResponseWriter writer, final AbstractUILabel component)
       throws IOException {
 
     final LabelWithAccessKey label = new LabelWithAccessKey(component);
 
     if (label.getAccessKey() != null) {
       writer.writeAttribute(HtmlAttributes.ACCESSKEY, Character.toString(label.getAccessKey()), false);
       AccessKeyLogger.addAccessKey(facesContext, label.getAccessKey(), component.getClientId());
     }
     HtmlRendererUtils.writeLabelWithAccessKey(writer, label);
   }
 }