/*
    * 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.util;
  
  import org.apache.myfaces.tobago.component.Attributes;
  import org.apache.myfaces.tobago.component.RendererTypes;
  import org.apache.myfaces.tobago.component.Tags;
  import org.apache.myfaces.tobago.component.Visual;
  import org.apache.myfaces.tobago.context.Markup;
  import org.apache.myfaces.tobago.internal.component.AbstractUIStyle;
  import org.apache.myfaces.tobago.renderkit.LabelWithAccessKey;
  import org.apache.myfaces.tobago.renderkit.css.Icons;
  import org.apache.myfaces.tobago.renderkit.css.TobagoClass;
  import org.apache.myfaces.tobago.renderkit.html.DataAttributes;
  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 org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.el.ELContext;
  import javax.el.ValueExpression;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIInput;
  import javax.faces.context.FacesContext;
  import javax.faces.model.SelectItem;
  import javax.faces.model.SelectItemGroup;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  import java.util.Arrays;
  import java.util.Locale;
  import java.util.Map;
  
  public final class HtmlRendererUtils {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private HtmlRendererUtils() {
      // to prevent instantiation
    }
  
    public static String getRendererName(final FacesContext facesContext, final UIComponent component) {
      final String rendererType = component.getRendererType();
      return rendererType.substring(0, 1).toLowerCase(Locale.ENGLISH) + rendererType.substring(1);
    }
  
    public static void writeLabelWithAccessKey(final TobagoResponseWriter writer, final LabelWithAccessKey label)
        throws IOException {
      final int pos = label.getPos();
      final String text = label.getLabel();
      if (text != null) {
        if (pos == -1) {
          writer.writeText(text);
        } else {
          writer.writeText(text.substring(0, pos));
          writer.startElement(HtmlElements.U);
          writer.writeText(Character.toString(text.charAt(pos)));
          writer.endElement(HtmlElements.U);
          writer.writeText(text.substring(pos + 1));
        }
      }
    }
  
    public static void encodeIconOrImage(final TobagoResponseWriter writer, final String image) throws IOException {
      if (image != null) {
        if (image.startsWith("fa-")) {
          writer.startElement(HtmlElements.I);
          writer.writeClassAttribute(Icons.FA, Icons.custom(image));
          writer.endElement(HtmlElements.I);
        } else {
          writer.startElement(HtmlElements.IMG);
          writer.writeAttribute(HtmlAttributes.SRC, image, true);
          writer.writeAttribute(HtmlAttributes.ALT, "", false);
          writer.endElement(HtmlElements.IMG);
        }
      }
    }
  
    public static String getTitleFromTipAndMessages(final FacesContext facesContext, final UIComponent component) {
      final String messages = ComponentUtils.getFacesMessageAsString(facesContext, component);
      return HtmlRendererUtils.addTip(messages, ComponentUtils.getAttribute(component, Attributes.tip));
   }
 
   public static String addTip(final String title, final Object tip) {
     String result = title;
     if (tip != null) {
       if (result != null && result.length() > 0) {
         result += " :: ";
       } else {
         result = "";
       }
       result += tip;
     }
     return result;
   }
 
   public static void renderSelectItems(final UIInput component, final TobagoClass optionClass,
       final Iterable<SelectItem> items, final Object[] values, final String[] submittedValues,
       final TobagoResponseWriter writer, final FacesContext facesContext) throws IOException {
     renderSelectItems(component, optionClass, items, values, submittedValues, null, writer, facesContext);
   }
 
   public static void renderSelectItems(final UIInput component, final TobagoClass optionClass,
       final Iterable<SelectItem> items, final Object value, final String submittedValue,
       final TobagoResponseWriter writer, final FacesContext facesContext) throws IOException {
     renderSelectItems(component, optionClass, items, value != null ? new Object[]{value} : null,
         submittedValue != null ? new String[]{submittedValue} : null, null, writer, facesContext);
   }
 
   public static void renderSelectItems(final UIInput component, final TobagoClass optionClass,
       final Iterable<SelectItem> items, final Object[] values, final String[] submittedValues,
       final Boolean onlySelected, final TobagoResponseWriter writer, final FacesContext facesContext)
       throws IOException {
 
     if (LOG.isDebugEnabled()) {
       LOG.debug("component id = '{}'", component.getId());
       LOG.debug("values = '{}'", Arrays.toString(values));
       LOG.debug("submittedValues = '{}'", Arrays.toString(submittedValues));
     }
     for (final SelectItem item : items) {
       if (item instanceof SelectItemGroup) {
         writer.startElement(HtmlElements.OPTGROUP);
         writer.writeAttribute(HtmlAttributes.LABEL, item.getLabel(), true);
         if (item.isDisabled()) {
           writer.writeAttribute(HtmlAttributes.DISABLED, true);
         }
         final SelectItem[] selectItems = ((SelectItemGroup) item).getSelectItems();
         renderSelectItems(component, optionClass, Arrays.asList(selectItems), values, submittedValues,
             onlySelected, writer, facesContext);
         writer.endElement(HtmlElements.OPTGROUP);
       } else {
 
         Object itemValue = item.getValue();
         // when using selectItem tag with a literal value: use the converted value
         if (itemValue instanceof String && values != null && values.length > 0 && !(values[0] instanceof String)) {
           itemValue = ComponentUtils.getConvertedValue(facesContext, component, (String) itemValue);
         }
         final String formattedValue = ComponentUtils.getFormattedValue(facesContext, component, itemValue);
         final boolean contains;
         if (submittedValues == null) {
           contains = ArrayUtils.contains(values, itemValue);
         } else {
           contains = ArrayUtils.contains(submittedValues, formattedValue);
         }
         if (onlySelected != null) {
           if (onlySelected) {
             if (!contains) {
               continue;
             }
           } else {
             if (contains) {
               continue;
             }
           }
         }
         writer.startElement(HtmlElements.OPTION);
         writer.writeAttribute(HtmlAttributes.VALUE, formattedValue, true);
         if (item instanceof org.apache.myfaces.tobago.model.SelectItem) {
           final String image = ((org.apache.myfaces.tobago.model.SelectItem) item).getImage();
           if (image != null) {
             final AbstractUIStyle style = (AbstractUIStyle) facesContext.getApplication()
                 .createComponent(facesContext, Tags.style.componentType(), RendererTypes.Style.name());
             style.setTransient(true);
             style.setBackgroundImage(image);
             style.setSelector(
                 StyleRenderUtils.encodeIdSelector(component.getClientId(facesContext))
                     + " option[value=" + formattedValue + "]");
             // XXX This works not in common browsers...
             component.getChildren().add(style);
           }
         }
         Markup markup = item instanceof Visual ? ((Visual) item).getMarkup() : Markup.NULL;
         if (onlySelected == null && contains) {
           writer.writeAttribute(HtmlAttributes.SELECTED, true);
           markup = Markup.SELECTED.add(markup);
         }
         if (item.isDisabled()) {
           writer.writeAttribute(HtmlAttributes.DISABLED, true);
           markup = Markup.DISABLED.add(markup);
         }
         writer.writeClassAttribute(optionClass, optionClass.createMarkup(markup));
 
         writer.writeText(item.getLabel());
         writer.endElement(HtmlElements.OPTION);
       }
     }
   }
 
   public static void writeDataAttributes(
       final FacesContext context, final TobagoResponseWriter writer, final UIComponent component)
       throws IOException {
 
     final Map<Object, Object> dataAttributes = ComponentUtils.getDataAttributes(component);
     if (dataAttributes == null) {
       return;
     }
 
     final ELContext elContext = context.getELContext();
 
     for (final Map.Entry<Object, Object> entry : dataAttributes.entrySet()) {
       final Object mapKey = entry.getKey();
       final String name = mapKey instanceof ValueExpression
           ? ((ValueExpression) mapKey).getValue(elContext).toString() : mapKey.toString();
       final Object mapValue = entry.getValue();
       final String value = mapValue instanceof ValueExpression
           ? ((ValueExpression) mapValue).getValue(elContext).toString() : mapValue.toString();
       writer.writeAttribute(DataAttributes.dynamic(name), value, true);
     }
   }
 }