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package com.googlecode.gwt.test.uibinder;

import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasHorizontalAlignment.HorizontalAlignmentConstant;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment.VerticalAlignmentConstant;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.TextBoxBase;
import com.google.gwt.user.client.ui.TextBoxBase.TextAlignConstant;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;
import com.googlecode.gwt.test.utils.JavaScriptObjects;

/**
 * Utility class for UiBinder XML stuff.
 * 
 * @author Gael Lazzari
 * 
 */
@SuppressWarnings("deprecation")
public class UiBinderXmlUtils {

   public static final String CLIENTUI_NSURI = "urn:import:com.google.gwt.user.client.ui";
   public static final String DATA_TAG = "data";
   public static final String FIELD_ATTR_NAME = "field";
   public static final String IMAGE_TAG = "image";
   public static final String IMPORT_TAG = "import";
   public static final String MSG_TAG = "msg";
   public static final String TEXT_TAG = "text";
   public static final String UIBINDER_NSURI = "urn:ui:com.google.gwt.uibinder";

   private static final Set RESOURCE_TAGS = new HashSet() {

      private static final long serialVersionUID = -619331154951585990L;

      {
         add(DATA_TAG);
         add(IMAGE_TAG);
         add(STYLE_TAG);
         add(WITH_TAG);
      }
   };

   private static final String STYLE_TAG = "style";
   private static final String TYPE_ATTR_NAME = "type";
   private static final String UIBINDER_TAG = "UiBinder";
   private static final String WITH_TAG = "with";

   /**
    * Retrieve all child widgets contained in a UiBinder custom Element (for example : ,
    * ...).
    * 
    * @param element The UiBinder custom Element.
    * @return The list of child widget, which would be empty if the element has no child.
    */
   public static List getChildWidgets(Element element) {
      List childWidgets = JavaScriptObjects.getObject(element,
               UiElementTag.UIBINDER_CHILD_WIDGETS_LIST);

      return childWidgets != null ? childWidgets : Collections. emptyList();
   }

   public static String getEffectiveStyleName(String style) {
      style = style.replaceAll("[\\{\\}\\s]", "");
      String[] array = style.split("\\.");
      return array[array.length - 1];
   }

   public static boolean isDataTag(String nameSpaceURI, String tagName) {
      return DATA_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isImageTag(String nameSpaceURI, String tagName) {
      return IMAGE_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isImportTag(String nameSpaceURI, String tagName) {
      return IMPORT_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isMsgTag(String nameSpaceURI, String tagName) {
      return MSG_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isResourceTag(String nameSpaceURI, String tagName) {
      return UIBINDER_NSURI.equals(nameSpaceURI) && RESOURCE_TAGS.contains(tagName);
   }

   public static boolean isStyleTag(String nameSpaceURI, String tagName) {
      return STYLE_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isTextTag(String nameSpaceURI, String tagName) {
      return TEXT_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isTypeAttribute(String nameSpaceURI, String attrName) {
      return TYPE_ATTR_NAME.equals(attrName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isUiBinderTag(String nameSpaceURI, String tagName) {
      return UIBINDER_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isUiFieldAttribute(String nameSpaceURI, String attrName) {
      return FIELD_ATTR_NAME.equals(attrName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static boolean isWithTag(String nameSpaceURI, String tagName) {
      return WITH_TAG.equals(tagName) && UIBINDER_NSURI.equals(nameSpaceURI);
   }

   public static HorizontalAlignmentConstant parseHorizontalAlignment(String horizontalAlignment) {
      return GwtReflectionUtils.getStaticFieldValue(HasHorizontalAlignment.class,
               horizontalAlignment);
   }

   public static TextAlignConstant parseTextAlignConstant(String string) {
      string = string.toLowerCase();

      if (string.equals("center")) {
         return TextBoxBase.ALIGN_CENTER;
      } else if (string.equals("justify")) {
         return TextBoxBase.ALIGN_JUSTIFY;
      } else if (string.equals("left")) {
         return TextBoxBase.ALIGN_LEFT;
      } else if (string.equals("right")) {
         return TextBoxBase.ALIGN_RIGHT;
      }

      return null;
   }

   public static VerticalAlignmentConstant parseVerticalAlignment(String verticalAlignment) {
      return GwtReflectionUtils.getStaticFieldValue(HasVerticalAlignment.class, verticalAlignment);
   }

   private UiBinderXmlUtils() {

   }

}