/*
    * 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.renderkit.html.scarborough.standard.tag;
  
  import org.apache.myfaces.tobago.component.UITree;
  import org.apache.myfaces.tobago.component.UITreeIndent;
  import org.apache.myfaces.tobago.context.Markup;
  import org.apache.myfaces.tobago.context.ResourceManagerUtils;
  import org.apache.myfaces.tobago.internal.component.AbstractUIData;
  import org.apache.myfaces.tobago.internal.component.AbstractUITreeNode;
  import org.apache.myfaces.tobago.renderkit.LayoutComponentRendererBase;
  import org.apache.myfaces.tobago.renderkit.css.Classes;
  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.renderkit.html.util.HtmlRendererUtils;
  import org.apache.myfaces.tobago.util.ComponentUtils;
  import org.apache.myfaces.tobago.webapp.TobagoResponseWriter;
  
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import java.io.IOException;
  import java.util.List;
  
  public class TreeIndentRenderer extends LayoutComponentRendererBase {
  
    @Override
    public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException {
  
      final UITreeIndent indent = (UITreeIndent) component;
      final AbstractUITreeNode node = ComponentUtils.findAncestor(indent, AbstractUITreeNode.class);
      final AbstractUIData data = ComponentUtils.findAncestor(indent, AbstractUIData.class);
  
      final boolean folder = node.isFolder();
      final int level = node.getLevel();
      final List<Boolean> junctions = node.getJunctions();
  
      final boolean showRoot = data.isShowRoot();
      final boolean showJunctions = indent.isShowJunctions();
      final boolean showRootJunction = data.isShowRootJunction();
      final boolean expanded = folder && data.getExpandedState().isExpanded(node.getPath());
      final boolean showLines = showJunctions && data instanceof UITree; // sheet should not show lines
      final boolean showIcons = showJunctions;
  
      final TobagoResponseWriter writer = HtmlRendererUtils.getTobagoResponseWriter(facesContext);
  
      writer.startElement(HtmlElements.SPAN, indent);
      writer.writeIdAttribute(indent.getClientId(facesContext));
      HtmlRendererUtils.writeDataAttributes(facesContext, writer, indent);
  
      encodeIndent(
          facesContext, writer, node, showLines, showIcons, showRootJunction, showRoot, junctions);
  
      encodeTreeJunction(
          facesContext, writer, node, showLines, showIcons, showRootJunction, junctions, expanded, folder, level == 0);
    }
  
    @Override
    public void encodeEnd(FacesContext facesContext, UIComponent component) throws IOException {
      final TobagoResponseWriter writer = HtmlRendererUtils.getTobagoResponseWriter(facesContext);
      writer.endElement(HtmlElements.SPAN);
    }
  
    private void encodeIndent(
        final FacesContext facesContext, final TobagoResponseWriter writer, final AbstractUITreeNode node,
        final boolean showLines, final boolean showIcons, final boolean showRootJunction, final boolean showRoot,
        final List<Boolean> junctions)
        throws IOException {
  
      final boolean dropFirst = !showRoot || !showRootJunction && (showLines || showIcons);
      final String blank = ResourceManagerUtils.getImageWithPath(facesContext, "image/blank.gif");
      final String perpendicular = ResourceManagerUtils.getImageWithPath(facesContext, "image/I.gif");
  
      for (int i = dropFirst ? 1 : 0; i < junctions.size() - 1; i++) {
        Boolean junction = junctions.get(i);
        writer.startElement(HtmlElements.IMG, null);
        writer.writeClassAttribute(Classes.create(node, "junction"));
        writer.writeAttribute(HtmlAttributes.ALT, "", false);
        if (junction && showLines) {
          writer.writeAttribute("src", perpendicular, true);
        } else {
          writer.writeAttribute("src", blank, true);
       }
       writer.endElement(HtmlElements.IMG);
     }
   }
 
   private void encodeTreeJunction(
       final FacesContext facesContext, final TobagoResponseWriter writer, final AbstractUITreeNode node,
       final boolean showLines, final boolean showIcons, final boolean showRootJunction, final List<Boolean> junctions,
       final boolean expanded, final boolean folder, final boolean root)
       throws IOException {
     if (!showIcons || !showRootJunction && root) {
       return;
     }
     final boolean hasNextSibling = junctions.get(junctions.size() - 1); // last element
     writer.startElement(HtmlElements.IMG, null);
     writer.writeClassAttribute(Classes.create(node, "toggle", Markup.NULL));
 
     final String open;
     final String close;
     if (showLines) {
       if (root) {
         open = "Rminus.gif";
         close = "Rplus.gif";
       } else {
         if (hasNextSibling) {
           if (folder) {
             open = "Tminus.gif";
             close = "Tplus.gif";
           } else {
             open = "T.gif";
             close = "T.gif";
           }
         } else {
           if (folder) {
             open = "Lminus.gif";
             close = "Lplus.gif";
           } else {
             open = "L.gif";
             close = "L.gif";
           }
         }
       }
     } else {
       if (folder) {
         open = "minus.gif";
         close = "plus.gif";
       } else {
         open = "blank.gif";
         close = "blank.gif";
       }
     }
 
     final String srcOpen = ResourceManagerUtils.getImageWithPath(facesContext, "image/" + open);
     final String srcClose = ResourceManagerUtils.getImageWithPath(facesContext, "image/" + close);
     final String src = expanded ? srcOpen : srcClose;
     writer.writeAttribute(HtmlAttributes.SRC, src, true);
     if (folder) {
       writer.writeAttribute(DataAttributes.SRCOPEN, srcOpen, true);
       writer.writeAttribute(DataAttributes.SRCCLOSE, srcClose, true);
     }
     writer.writeAttribute(HtmlAttributes.ALT, "", false);
     writer.endElement(HtmlElements.IMG);
   }
 
 }