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

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

import com.smartgwt.client.types.ImageStyle;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.types.VerticalAlignment;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
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.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.shared.MapUtils;
import de.intevation.flys.client.shared.model.AttributedTheme;
import de.intevation.flys.client.shared.model.Collection;
import de.intevation.flys.client.shared.model.FacetRecord;
import de.intevation.flys.client.shared.model.Theme;
import de.intevation.flys.client.shared.model.OutputMode;

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


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class MapThemePanel extends ThemePanel {

    public static final int CELL_HEIGHT      = 75;
    public static final int STYLE_CELL_WIDTH = 125;


    public interface ActivateCallback {
        void activate(Theme theme, boolean activate);
    }


    public interface ThemeMovedCallback {
        void onThemeMoved(Theme theme, int oldIdx, int newIdx);
    }



    private FLYSConstants MSG = GWT.create(FLYSConstants.class);


    protected ActivateCallback   activateCallback;
    protected ThemeMovedCallback themeMovedCallback;


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


    protected MapOutputTab mapOut;


    public MapThemePanel(
        Collection         collection,
        OutputMode         mode,
        ActivateCallback   activateCallback
    ) {
        this(collection, mode, activateCallback, null);
    }


    public MapThemePanel(
        Collection         collection,
        OutputMode         mode,
        ActivateCallback   activateCallback,
        ThemeMovedCallback themeMovedCallback
    ) {
        super(collection, mode);

        this.activateCallback   = activateCallback;
        this.themeMovedCallback = themeMovedCallback;

        initGrid();
        initLayout();

        updateGrid();
    }


    protected void initLayout() {
        setWidth100();
        setHeight100();

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

        layout.addMember(list);
        layout.addMember(navigation);

        addChild(layout);
    }


    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.setCellHeight(CELL_HEIGHT);
        list.setShowRecordComponents(true);
        list.setShowRecordComponentsByCell(true);
        list.setShowAllRecords(true);

        list.addEditCompleteHandler(this);

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

        ListGridField style = new ListGridField(
            GRID_FIELD_STYLE,
            MSG.map_themepanel_header_style(),
            STYLE_CELL_WIDTH);
        style.setCanEdit(false);
        style.setCanDragResize(false);

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

        list.setFields(active, style, name);
    }


    @Override
    protected ListGrid createNewGrid() {
        ListGrid grid = new ListGrid() {
            @Override
            protected Canvas createRecordComponent(final ListGridRecord record, Integer colNum) {
                String fieldname = getFieldName(colNum);

                if (fieldname.equals(GRID_FIELD_STYLE)) {
                    FacetRecord      r = (FacetRecord) record;
                    AttributedTheme at = (AttributedTheme) r.getTheme();

                    String imgUrl = MapUtils.getLegendGraphicUrl(
                        at.getAttr("url"),
                        at.getAttr("layers"));

                    HLayout layout = new HLayout();
                    layout.setAlign(VerticalAlignment.CENTER);
                    layout.setLayoutAlign(VerticalAlignment.CENTER);

                    Img img = new Img(imgUrl);
                    img.setImageType(ImageStyle.CENTER);

                    layout.addMember(img);

                    return layout;
                }

                return super.createRecordComponent(record, colNum);
            }
        };

        return grid;
    }


    @Override
    public void activateTheme(Theme theme, boolean active) {
        if (activateCallback != null) {
            activateCallback.activate(theme, active);
        }

        theme.setActive(active ? 1 : 0);
    }


    @Override
    protected void fireThemeMoved(Theme theme, int oldIdx, int newIdx) {
        if (themeMovedCallback != null) {
            themeMovedCallback.onThemeMoved(theme, oldIdx, newIdx);
        }
    }
}
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