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

import java.util.HashMap;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;

import com.smartgwt.client.util.SC;

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.HTMLPane;
import com.smartgwt.client.widgets.layout.VLayout;

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

import de.intevation.flys.client.client.Config;

import de.intevation.flys.client.shared.model.Data;
import de.intevation.flys.client.shared.model.DataList;
import de.intevation.flys.client.shared.model.FixingsOverviewInfo;

import de.intevation.flys.client.client.services.FixingsOverviewService;
import de.intevation.flys.client.client.services.FixingsOverviewServiceAsync;


/**
 * This UIProvider creates helper panel for fixation analysis without input
 * elements.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public abstract class FixationPanel
extends      AbstractUIProvider
{
    protected static HashMap<String, FixationPanel> instances = new HashMap<String, FixationPanel>();

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

    protected FixingsOverviewServiceAsync overviewService =
        GWT.create(FixingsOverviewService.class);

    protected String   htmlOverview;
    protected FixingsOverviewInfo fixInfo;

    public FixationPanel() {
        htmlOverview = "";
    }

    protected String getArtifactUuid() {
        return this.artifact.getUuid();
    }

    protected void init() {

    }

    public Data[] getData() {
        return null;
    }

    public Canvas create(DataList list) {
        VLayout layout = new VLayout();

        Canvas helper = createHelper();
        this.helperContainer.addMember(helper);

        Canvas submit = getNextButton();
        Canvas widget = createWidget(list);

        layout.addMember(widget);
        layout.addMember(submit);
        return layout;
    }

    public Canvas createOld(DataList list) {
        return new DynamicForm();
    }

    protected Canvas createHelper() {
        Config config    = Config.getInstance();
        String locale    = config.getLocale ();

        final HTMLPane helper = new HTMLPane();

        String river = artifact.getArtifactDescription().getRiver();

        createCallback();
/*
Filter example.
{"fixings": { "river": { "name": "Elbe"}, "range": {"from": 1, "to": 200}, "filter": {"and": { "column": {"cid": 1}, "column": {"cid": 2} } }}
*/
        String callBack = "fixationCallback(this.checked, this.name)";

        overviewService.generateOverview(
            locale,
            artifact.getUuid(),
            "{\"fixings\": {\"river\": {\"name\": \"" + river + "\"}}}",
            renderCheckboxes(),
            callBack,
            new AsyncCallback<FixingsOverviewInfo>() {
                public void onFailure(Throwable caught) {
                    GWT.log("Could not receive overview.");
                    SC.warn(caught.getMessage());
                }
                public void onSuccess(FixingsOverviewInfo info) {
                    GWT.log("Successfully loaded overview.");
                    fixInfo = info;
                    htmlOverview = info.getHTML();
                    GWT.log("html: " + info.getHTML());
                    helper.setContents(htmlOverview);

                }
            });

        this.helperContainer.addMember(helper);

        return helper;
    }

    private native void createCallback() /*-{
        $wnd.fixationCallback = @de.intevation.flys.client.client.ui.fixation.FixationPanel::helperCallback(ZLjava/lang/String;);
    }-*/;

    private static void helperCallback(boolean checked, String name) {
        String[] parts = name.split(":");
        String uuid = parts[0];
        String cid = parts[1];
        FixationPanel p = FixationPanel.getInstance(uuid);
        if (p != null) {
            p.setValues(cid, checked);
        }
    }

    private static FixationPanel getInstance(String uuid) {
        for (int i = 0; i < instances.size(); i++) {
            if (instances.get(uuid) != null) {
                return instances.get(uuid);
            }
        }
        return null;
    }

    public abstract Canvas createWidget(DataList data);
    public abstract void setValues(String cid, boolean checked);
    public abstract boolean renderCheckboxes();
}