package de.intevation.flys.client.client.ui;

import java.util.Iterator;

import com.google.gwt.core.client.GWT;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

import de.intevation.flys.client.client.FLYSConstants;

import de.intevation.flys.client.shared.model.RiverInfo;

/**
 * Panel to display information about a river.
 * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a>
 */
public class RiverInfoPanel extends HorizontalPanel {

    /** The message class that provides i18n strings.*/
    protected FLYSConstants MSG = GWT.create(FLYSConstants.class);

    public final static int HEIGHT = 30;
    public final static int BORDER_WIDTH = 3;
    public final static int PADDING = 8;
    public final static int MARGIN = 10;

    public RiverInfoPanel(RiverInfo riverinfo) {
        setStyleName("riverinfopanel");
        setHeight("" + HEIGHT + "px");
        setVerticalAlignment(ALIGN_MIDDLE);

        setRiverInfo(riverinfo);
    }

    public void setRiverInfo(RiverInfo riverinfo) {
        GWT.log("RiverInfoPanel - setRiverInfo");

        NumberFormat nf = NumberFormat.getDecimalFormat();

        removeAllLabels();

        addLabel(riverinfo.getName(), false);

        String kmtext = "";
        Double start = riverinfo.getKmStart();
        Double end = riverinfo.getKmEnd();

        if (!riverinfo.isKmUp()) {
            Double tmp = end;
            end = start;
            start = tmp;
        }
        if (end != null) {
            kmtext += nf.format(end);
            kmtext += " - ";
        }
        if (start != null) {
            kmtext += nf.format(start);
        }
        kmtext += " km";

        addLabel(kmtext, false);

        String qtext = "";
        Double qmin = riverinfo.getMinQ();
        Double qmax = riverinfo.getMaxQ();
        if (qmin != null) {
            qtext += nf.format(qmin);
            qtext += " " + MSG.gauge_q_unit();
            qtext += " - ";
        }
        if (qmax != null) {
            qtext += nf.format(qmax);
            qtext += " " + MSG.gauge_q_unit();
        }

        addLabel(qtext, false);

        Long number = riverinfo.getOfficialNumber();
        String url = number != null ?
            MSG.gauge_river_url() + number :
            MSG.gauge_river_url();
        Anchor anchor = new Anchor(MSG.gauge_river_info_link(), url, "_blank");
        add(anchor);
    }

    public static int getStaticHeight() {
        return RiverInfoPanel.HEIGHT +
            (2 * RiverInfoPanel.BORDER_WIDTH) +
            (2 * RiverInfoPanel.PADDING) +
            (2 * RiverInfoPanel.MARGIN);
    }

    private void addLabel(String text, boolean wordwrap) {
        Label label = new Label(text, wordwrap);
        add(label);
        setCellHeight(label, "" + HEIGHT + "px");
    }

    private void removeAllLabels() {
        GWT.log("RiverInfoPanel - removeAllLabels");

        Iterator<Widget> it = this.iterator();
        while(it.hasNext()) {
            it.next();
            it.remove();
        }
        /* for (Widget wid: this) { */
        /*     this.remove(wid); */
        /* } */
    }
}