/*

 * Copyright (C) 2011 Openismus GmbH

 *

 * This file is part of GWT-Glom.

 *

 * GWT-Glom is free software: you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by the

 * Free Software Foundation, either version 3 of the License, or (at your

 * option) any later version.

 *

 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.

 */

package org.glom.web.client;

import org.glom.web.shared.DataItem;

import org.glom.web.shared.GlomNumericFormat;

import org.glom.web.shared.TypedDataItem;

import org.glom.web.shared.layout.LayoutItemField.GlomFieldType;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.Document;

import com.google.gwt.dom.client.Style.Visibility;

import com.google.gwt.i18n.client.LocaleInfo;

import com.google.gwt.i18n.client.NumberFormat;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.Widget;

/**

 *

 */

public class Utils {

	public static NumberFormat getNumberFormat(GlomNumericFormat glomNumericFormat) {

		StringBuilder pattern = new StringBuilder("0.");

		// add pattern for thousands separator

		if (glomNumericFormat.getUseThousandsSeparator()) {

			pattern.insert(0, "#,##");

		}

		// add pattern for restricted decimal places

		if (glomNumericFormat.getDecimalPlacesRestricted()) {

			for (int i = 0; i < glomNumericFormat.getDecimalPlaces(); i++) {

				pattern.append('0');

			}

		} else {

			// The default precision in libglom is 15.

			pattern.append("###############");

		}

		// TODO use exponential numbers when more than 15 decimal places

		return NumberFormat.getFormat(pattern.toString());

	}

	/**

	 * Get the vertical height with decorations (i.e. CSS) by temporarily adding the widget to the body element of the

	 * document in a transparent container. This is required because the size information is only available when the

	 * widget is attached to the DOM.

	 * 

	 * This method must be called before the widget is added to its container because it will be removed from any

	 * container it is already inside. TODO: Fix this problem by saving a reference to its parent and re-addding it

	 * after the height information has been calculated.

	 * 

	 * @param widget

	 *            get the height information for this widget

	 * @return the height of the widget with styling applied

	 */

	public static int getWidgetHeight(Widget widget) {

		Document doc = Document.get();

		com.google.gwt.dom.client.Element div = doc.createDivElement();

		// Hidden elements are invisible, don't respond to events and are not part of the tab order. But they will take

		// up space.

		div.getStyle().setVisibility(Visibility.HIDDEN);

		div.appendChild(widget.getElement().<com.google.gwt.user.client.Element> cast());

		doc.getBody().appendChild(div);

		int height = widget.getOffsetHeight();

		doc.getBody().removeChild(div);

		div = null;

		return height;

	}

	public static TypedDataItem getTypedDataItem(GlomFieldType glomFieldType, DataItem dataItem) {

		TypedDataItem primaryKeyItem = new TypedDataItem();

		switch (glomFieldType) {

		case TYPE_BOOLEAN:

			primaryKeyItem.setBoolean(dataItem.getBoolean());

			break;

		case TYPE_NUMERIC:

			primaryKeyItem.setNumber(dataItem.getNumber());

			break;

		case TYPE_TEXT:

			primaryKeyItem.setText(new String(dataItem.getText() == null ? "" : dataItem.getText()));

			break;

		default:

			GWT.log("getTypedDataItem(): Unsupported Glom Field Type: " + glomFieldType);

			break;

		}

		return primaryKeyItem;

	}

	public static String getCurrentLocaleName() {

		String localeID = LocaleInfo.getCurrentLocale().getLocaleName();

		if(localeID == "default")

		{

			localeID = ""; //This is how libglom refers to the default locale.

		}

		if(StringUtils.isEmpty(localeID))

		{

			// LocaleInfo.getCurrentLocale() returns "default" even if a real locale was specified in the URL,

			// if the locale is not specified as supported in our OnlineGlom.gwt.xml file,

			// but people could use locales in .glom files that we have not thought of,

			// so we should allow their use by getting the query parameter value directly:

			final String paramValue = Window.Location.getParameter(LocaleInfo.getLocaleQueryParam());

			localeID = paramValue;

		}

		return localeID;

	}

}