/* 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.minfo;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.util.SC;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.TextItem;
import com.smartgwt.client.widgets.form.validator.IsIntegerValidator;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import org.dive4elements.river.client.client.Config;
import org.dive4elements.river.client.client.services.SedimentLoadInfoService;
import org.dive4elements.river.client.client.services.SedimentLoadInfoServiceAsync;
import org.dive4elements.river.client.client.ui.AbstractUIProvider;
import org.dive4elements.river.client.shared.model.ArtifactDescription;
import org.dive4elements.river.client.shared.model.Data;
import org.dive4elements.river.client.shared.model.DataItem;
import org.dive4elements.river.client.shared.model.DataList;
import org.dive4elements.river.client.shared.model.DefaultData;
import org.dive4elements.river.client.shared.model.DefaultDataItem;
import org.dive4elements.river.client.shared.model.SedimentLoadInfoObject;
import org.dive4elements.river.client.shared.model.SedimentLoadInfoRecord;


public class SedLoadPeriodPanel
extends AbstractUIProvider
{
    protected SedimentLoadInfoServiceAsync sedLoadInfoService =
        GWT.create(SedimentLoadInfoService.class);

    private TextItem start;
    private TextItem end;

    private ListGrid sedLoadTable;

    public SedLoadPeriodPanel () {
    }

    @Override
    public Canvas createOld(DataList dataList) {
        List<Data> items = dataList.getAll();
        Data start = getData(items, "start");
        Data end = getData(items, "end");
        DataItem[] startItem = start.getItems();
        DataItem[] endItem = end.getItems();

        String v1 = startItem[0].getStringValue();
        String v2 = endItem[0].getStringValue();

        int v1i = 0;
        int v2i = 0;
        try {
            v1i = Integer.parseInt(v1);
            v2i = Integer.parseInt(v2);
        }
        catch (NumberFormatException nfe) {
            GWT.log(nfe.toString());
        }
        Label old = new Label(v1i + " - " + v2i);
        HLayout layout = new HLayout();
        layout.setWidth("400px");

        Label label = new Label(dataList.getLabel());
        label.setWidth("200px");

        Canvas back = getBackButton(dataList.getState());

        layout.addMember(label);
        layout.addMember(old);
        layout.addMember(back);

        return layout;
    }

    @Override
    public Canvas create(DataList data) {
        VLayout layout = new VLayout();

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

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

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

        fetchSedimentLoadData();

        return layout;
    }

    private Canvas createHelper() {
        sedLoadTable = new ListGrid();
        sedLoadTable.setShowHeaderContextMenu(false);
        sedLoadTable.setWidth100();
        sedLoadTable.setShowRecordComponents(true);
        sedLoadTable.setShowRecordComponentsByCell(true);
        sedLoadTable.setHeight100();
        sedLoadTable.setEmptyMessage(MSG.empty_table());
        sedLoadTable.setCanReorderFields(false);

        ListGridField date = new ListGridField("date", MSG.year());
        date.setType(ListGridFieldType.TEXT);
        date.setWidth(100);

        ListGridField descr =
            new ListGridField("description", MSG.description());
        descr.setType(ListGridFieldType.TEXT);
        descr.setWidth("*");

        sedLoadTable.setFields(date, descr);
        return sedLoadTable;
    }

    public Canvas createWidget(DataList data) {
        VLayout layout = new VLayout();

        Label title = new Label(data.get(0).getDescription());
        title.setHeight("25px");

        DynamicForm form = new DynamicForm();
        form.setNumCols(4);
        start = new TextItem(MSG.from());
        start.setValidators(new IsIntegerValidator());
        end = new TextItem(MSG.to());
        end.setValidators(new IsIntegerValidator());
        form.setFields(start, end);
//        inputPanel.setToTitle(MSG.to());
//        inputPanel.setFromTitle(MSG.from());
//        inputPanel.setShowTitle(false);

        layout.addMember(title);
        layout.addMember(form);

        return layout;
    }

    @Override
    protected Data[] getData() {
        int v1;
        int v2;
        try {
            v1 = Integer.parseInt(start.getValueAsString());
            v2 = Integer.parseInt(end.getValueAsString());
        }
        catch(NumberFormatException nfe) {
            // warn the user...
            return new Data[0];
        }
        if (validateRange(v1, v2)) {
            List<Data> data = new ArrayList<Data>();

            DataItem startItem = new DefaultDataItem("start", "start", start.getValueAsString());
            DataItem endItem   = new DefaultDataItem("end", "end", end.getValueAsString());
            data.add(new DefaultData(
                "start",
                null,
                null,
                new DataItem[] { startItem }));
            data.add(new DefaultData(
                "end",
                null,
                null,
                new DataItem[] { endItem }));

            return data.toArray(new Data[data.size()]);
        }
        return new Data[0];
    }

    protected boolean validateRange(int v1, int v2) {
        // TODO: Set useful years for validation. Current range is between start
        // of gregorian calendar and a year in the future...
        if ((v1 > 1582 && v1 < 2100)
            && (v2 > 1582 && v2 < 2100)) {
            return true;
        }
        return false;
    }

   protected void fetchSedimentLoadData() {
        Config config    = Config.getInstance();
        String locale    = config.getLocale ();

        ArtifactDescription adescr = artifact.getArtifactDescription();
        DataList[] data = adescr.getOldData();

        double[] km = artifact.getArtifactDescription().getKMRange();
        String river = artifact.getArtifactDescription().getRiver();

        sedLoadInfoService.getSedimentLoadInfo(locale, river, "single", km[0], km[1],
            new AsyncCallback<SedimentLoadInfoObject[]>() {
                public void onFailure(Throwable caught) {
                    GWT.log("Could not recieve sediment load informations.");
                    SC.warn(caught.getMessage());
                }

                public void onSuccess(SedimentLoadInfoObject[] sedLoad) {
                    int num = sedLoad != null ? sedLoad.length :0;
                    GWT.log("Recieved " + num + " sediment load informations.");

                    if (num == 0) {
                        return;
                    }

                    addSedimentLoadInfo(sedLoad);
                }
            }
        );
    }


    protected void addSedimentLoadInfo (SedimentLoadInfoObject[] sedLoad) {
        for(SedimentLoadInfoObject sl: sedLoad) {
            SedimentLoadInfoRecord rec = new SedimentLoadInfoRecord(sl);
            sedLoadTable.addData(rec);
        }
    }

}