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

import com.google.gwt.core.client.GWT;
import com.google.gwt.i18n.client.NumberFormat;
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.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.grid.ListGridRecord;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.client.Config;
import de.intevation.flys.client.client.FLYSConstants;
import de.intevation.flys.client.client.services.CSVExportService;
import de.intevation.flys.client.client.services.CSVExportServiceAsync;
import de.intevation.flys.client.shared.model.DataList;

import java.util.List;

/**
 * This UIProvider creates a widget that displays calculated data in a table.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class TableDataPanel
{
    /** The message class that provides i18n strings. */
    protected FLYSConstants MESSAGES = GWT.create(FLYSConstants.class);

    protected CSVExportServiceAsync exportService =
        GWT.create(CSVExportService.class);

    /** A container that will contain the location or the distance panel. */
    protected VLayout container;

    /** The export type. */
    protected String name;

    /** The UUID of the collection. */
    protected String uuid;

    /** The table. */
    protected ListGrid dataTable;


    /**
     * Creates a new LocationDistancePanel instance.
     */
    public TableDataPanel() {
        container = new VLayout();
        dataTable = new ListGrid();
        name      = "";
    }


    /**
     * This method creates a widget that contains a table.
     *
     * @return a panel.
     */
    public Canvas create() {
        Config config    = Config.getInstance();
        String locale    = config.getLocale ();
        dataTable.setEmptyMessage(MESSAGES.empty_table());
        dataTable.setShowHeaderContextMenu(false);
        dataTable.setCanDragSelectText(true);

        exportService.getCSV(locale, uuid, name,
            new AsyncCallback<List<String[]>>() {
                @Override
                public void onFailure(Throwable caught) {
                    GWT.log("Could not recieve csv.");
                    SC.warn(caught.getMessage());
                }

                @Override
                public void onSuccess(List<String[]> l) {
                    GWT.log("Recieved csv with " + l.size() + " lines.");
                    setData(l);
                }
            }
        );

        container.addMember(dataTable);

        return container;
    }


    public void setName(String name) {
      this.name = name;
    }

    public void setUuid(String uuid) {
      this.uuid = uuid;
    }


    public Canvas createOld(DataList dataList) {
        return null;
    }


    protected Canvas createWidget(DataList data) {
        return null;
    }


    /**
     * This method sets the data to a dynamic table.
     *
     * @param list List if String[] containing the data.
     */
    public void setData(List<String[]> list) {
        if (list == null || list.size() < 2) {
            dataTable.setEmptyMessage(MESSAGES.error_no_calc_result());
            dataTable.redraw();
            return;
        }

        Config config = Config.getInstance();
        String locale = config.getLocale();

        NumberFormat nf;
        if (locale.equals("de")) {
            nf = NumberFormat.getFormat("#,##");
        }
        else {
            nf = NumberFormat.getFormat("#.##");
        }

        String[] header      = list.get(0);
        String[] firstValues = list.get(1);

        ListGridField[] fields = new ListGridField[header.length];

        for(int i = 0; i < header.length; i++) {
            ListGridField f = new ListGridField(String.valueOf(i));
            fields[i] = f;
            f.setTitle(header[i]);

            try {
                nf.parse(firstValues[i]);
                f.setType(ListGridFieldType.FLOAT);
            }
            catch (NumberFormatException nfe) {
                f.setType(ListGridFieldType.TEXT);
            }
        }

        dataTable.setFields(fields);

        for(int i = 1; i < list.size(); i++) {
            String[] sItem = list.get(i);
            ListGridRecord r = new ListGridRecord();
            for(int j = 0; j < sItem.length; j++) {
                r.setAttribute(String.valueOf(j), sItem[j]);
            }
            dataTable.addData(r);
        }
    }
}
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