/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.client.client.ui.map;

import java.util.List;

import org.dive4elements.river.client.client.FLYSConstants;
import org.dive4elements.river.client.shared.MapUtils;
import org.dive4elements.river.client.shared.model.AttributedTheme;
import org.dive4elements.river.client.shared.model.Theme;
import org.dive4elements.river.client.shared.model.ThemeList;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Widget;
import com.smartgwt.client.types.ImageStyle;
import com.smartgwt.client.types.VerticalAlignment;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.Window;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

public class LegendWindow extends Window {

	protected FLYSConstants MSG = GWT.create(FLYSConstants.class);

	private ThemeList themeList;

	private final VLayout legendContainer;

	public LegendWindow(final ThemeList themeList) {
		this.themeList = themeList;
		this.legendContainer = new VLayout();

		init();
	}

	public void update(final ThemeList themeList) {
		this.themeList = themeList;

		final Canvas[] legends = this.legendContainer.getMembers();
		this.legendContainer.removeMembers(legends);

		addLegends();
	}

	private void addLegends() {
		final List<Theme> themes = this.themeList.getActiveThemes();
		com.smartgwt.client.util.SC.say("themescount " + themes.size());

		for (int i = 0; i < themes.size(); i++) {
			final Theme theme = themes.get(i);
			if (theme.getActive() == 0) {
				continue;
			}
			try {
				if (theme instanceof AttributedTheme) {
					Canvas createLegendGraphicsRow = createLegendGraphicsRow((AttributedTheme) theme);
					this.legendContainer.addMember(createLegendGraphicsRow);
				}
			} catch (Exception e) {
				com.smartgwt.client.util.SC.say("exception at index " + themes.size());
				continue;
			}
		}
	}

	private Canvas createLegendGraphicsRow(final AttributedTheme at) {
		com.smartgwt.client.util.SC.say("init");
		final Label label = new Label(at.getDescription());
		final Widget img = createLegendGraphics(at);

		final HLayout row = new HLayout();
		row.addMember(label);
		row.addMember(img);

		String url = "url";

		if (img instanceof Image) {
			Image.prefetch(((Image) img).getUrl());
			setDimensions(row, ((Image) img).getHeight(), ((Image) img).getWidth());
			url = " url " + ((Image) img).getUrl();
		} else if (img instanceof Img) {
			setDimensions(row, ((Img) img).getHeight(), ((Img) img).getWidth());
			url = " dataPath " + ((Img) img).getDataPath();
		} else {
			setDimensions(row, 150, 400); // not sure when this is executed
		}
		String labelText = at.getDescription() + ", height: " + row.getHeight() + "width: " + row.getWidth() + " "
				+ url;
		//
		// final HLayout row2= new HLayout();
		// row.addMember(new Label(labelText));

		com.smartgwt.client.util.SC.say(labelText);
		return row;
	}

	private void setDimensions(HLayout row, int height, int width) {
		final int minHeight = 30;
		row.setHeight(height < minHeight ? minHeight : height);
		row.setWidth(width);
	}

	private Widget createLegendGraphics(final AttributedTheme at) {

		final String legend = at.getAttr("legend");
		// TEST: final Image img = new Image("/images/FLYS_Donau.png"); (funktioniert!),
		// ebenso FLYSResources.getTest();
		if (legend != null && !"".equals(legend)) {

			final String imgUrl = URL.encode(GWT.getHostPageBaseURL() + "images/wms_legend/" + legend);

			final Image image = new Image(imgUrl);
			final int imageWidth = image.getWidth();
			final int imageHeight = image.getHeight();
			final double widthPercent = imageWidth / 400.;

			// removing the limit of 150px height (legend can have an infinite height now,
			// as long as the width is less/eq 400px; if the width is >400,
			// the legend will be scaled to 400px width; the ratio will be kept)

			// final double heightPercent = imageHeight / 150.;
			if (widthPercent > 1)// || heightPercent > 1) {
				image.setSize((int) (imageWidth / widthPercent) + "px", (int) (imageHeight / widthPercent) + "px");

			return image;
		}
		final String imgUrl = MapUtils.getLegendGraphicUrl(at.getAttr("url"), at.getAttr("layers"));

		final Img img = new Img(imgUrl);
		img.setImageType(ImageStyle.CENTER);
		img.setAutoFit(true);

		return img;
	}

	private void init() {
		this.legendContainer.setAutoHeight();
		this.legendContainer.setLayoutAlign(VerticalAlignment.TOP);
		this.legendContainer.setAlign(VerticalAlignment.CENTER);

		setTitle(this.MSG.wms_legend());
		setAutoSize(true);
		setCanDragResize(true);
		setIsModal(false);
		setShowModalMask(false);
		setLayoutAlign(VerticalAlignment.TOP);
		setAlign(VerticalAlignment.TOP);

		addItem(this.legendContainer);
		addLegends();

		centerInPage();
	}
}