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

import java.util.List;

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

import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.grid.events.EditCompleteEvent;
import com.smartgwt.client.widgets.grid.events.EditCompleteHandler;
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.shared.model.Collection;
import de.intevation.flys.client.shared.model.Facet;
import de.intevation.flys.client.shared.model.FacetRecord;
import de.intevation.flys.client.shared.model.OutputMode;

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


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ChartThemePanel extends Canvas implements EditCompleteHandler {

    /** The interface that provides i18n messages. */
    private FLYSConstants MSG = GWT.create(FLYSConstants.class);

    public static final String GRID_FIELD_ACTIVE = "active";
    public static final String GRID_FIELD_NAME   = "name";


    protected Collection collection;

    protected OutputMode mode;

    protected ListGrid list;



    public ChartThemePanel(Collection collection, OutputMode mode) {
        this.collection = collection;
        this.mode       = mode;
        this.list       = new ListGrid();

        initGrid();
        initLayout();

        updateGrid();
    }


    /**
     * Initializes the layout of this panel.
     */
    protected void initLayout() {
        setWidth100();
        setHeight100();

        VLayout layout = new VLayout();
        layout.setWidth100();
        layout.setHeight100();

        layout.addMember(list);

        addChild(layout);
    }


    /**
     * Initializes the components (columns) of the theme grid.
     */
    protected void initGrid() {
        list.setCanEdit(true);
        list.setCanSort(false);
        list.setShowRecordComponents(false);
        list.setShowRecordComponentsByCell(true);
        list.setShowHeader(true);
        list.setShowHeaderContextMenu(false);
        list.setWidth100();
        list.setHeight100();

        list.addEditCompleteHandler(this);

        ListGridField active = new ListGridField(GRID_FIELD_ACTIVE, " ", 20);
        active.setType(ListGridFieldType.BOOLEAN);

        ListGridField name = new ListGridField(
            GRID_FIELD_NAME, MSG.chart_themepanel_header_themes());
        name.setType(ListGridFieldType.TEXT);

        list.setFields(active, name);
    }


    /**
     * A method that removes all records from theme grid.
     */
    protected void clearGrid() {
        ListGridRecord[] records = list.getRecords();

        if (records == null || records.length == 0) {
            return;
        }

        for (ListGridRecord record: records) {
            list.removeData(record);
        }
    }


    /**
     * This method is used to clear the current theme grid and add new updated
     * data.
     */
    protected void updateGrid() {
        clearGrid();

        List<Facet> facets = mode.getFacets();

        for (Facet facet: facets) {
            list.addData(new FacetRecord(facet));
        }
    }


    /**
     * This method is called after a cell in the theme grid has been modified.
     *
     * @param event The event that stores information about the modified record.
     */
    public void onEditComplete(EditCompleteEvent event) {
        GWT.log("Edited record.");

        int         row = event.getRowNum();
        FacetRecord rec = (FacetRecord) list.getRecord(row);

        // TODO Save modified facets
    }
}
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