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

import java.util.List;

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

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.HTMLPane;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.shared.model.Collection;
import de.intevation.flys.client.shared.model.ExportMode;
import de.intevation.flys.client.shared.model.Facet;
import de.intevation.flys.client.client.Config;
import de.intevation.flys.client.client.FLYSConstants;


/**
 * A panel that displays an download icon for all available export modes of a
 * Collection.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ExportPanel extends VLayout {

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

    protected Collection       c;
    protected List<ExportMode> exports;

    /** This layout will store a list of available export types.*/
    protected HLayout container;


    public ExportPanel(Collection c, List<ExportMode> exports) {
        super();

        this.c         = c;
        this.exports   = exports;
        this.container = new HLayout();

        Label title = new Label(MSG.dataexport());
        title.setHeight(15);
        title.setStyleName("fontNormalSmallUnderlined");

        addMember(title);
        addMember(createExportItems());

        setHeight(45);
        setMembersMargin(5);
    }


    /**
     * This method is used to create an item (created by createExportButton) for
     * each facet for each export mode.
     *
     * @return a horizontal list of buttons.
     */
    protected HLayout createExportItems() {
        HLayout layout = new HLayout();

        for (ExportMode mode: exports) {
            String      name   = mode.getName();
            List<Facet> facets = mode.getFacets();

            for (Facet facet: facets) {
                layout.addMember(createExportButton(name, facet.getName()));
            }
        }

        return layout;
    }


    /**
     * This method is used to create a button (with click handler) for a
     * concrete export mode / type.
     *
     * @param name The name of the export.
     * @param facet The name of the export type (e.g. CSV, WST).
     *
     * @return an image with click handler.
     */
    protected Canvas createExportButton(String name, String facet) {
        String url  = getExportUrl(name, facet);
        String iUrl = GWT.getHostPageBaseURL() + MSG.imageSave();

        HTMLPane pane = new HTMLPane();
        pane.setContents("<a href='" + url + "'><img src='" + iUrl + "'></a>");

        return pane;
    }


    /**
     * Creates the URL used to trigger an export.
     *
     * @param name The name of the export.
     * @param facet The name of the export type (e.g. CSV, WST).
     *
     * @return the export URL.
     */
    protected String getExportUrl(String name, String facet) {
        Config config = Config.getInstance();

        String url = GWT.getModuleBaseURL();
        url += "export";
        url += "?uuid=" + c.identifier();
        url += "&mode=" + name;
        url += "&type=" + facet;
        url += "&server=" + config.getServerUrl();
        url += "&locale=" + config.getLocale();

        return url;
    }
}
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