/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 *******************************************************************************/

package com.liferay.ide.layouttpl.ui.parts;

import com.liferay.ide.layouttpl.core.model.CanAddPortletLayouts;
import com.liferay.ide.layouttpl.core.model.PortletLayoutElement;

import java.util.List;

import org.eclipse.draw2d.GridLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.Panel;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.editparts.AbstractEditPart;
import org.eclipse.sapphire.ElementList;

/**
 * @author Cindy Li
 *
 */
public abstract class PortletRowLayoutEditPart extends BaseGraphicalEditPart
{
    public static final int DEFAULT_COLUMN_HEIGHT = -1;

    protected Panel panel;

    protected void configurePanel( Panel panel )
    {
        GridLayout gridLayout = new GridLayout( 1, false );
        gridLayout.marginHeight = 0;
        gridLayout.marginWidth = 0;
        gridLayout.verticalSpacing = 0;

        panel.setLayoutManager( gridLayout );
        panel.setBorder( new MarginBorder( getMargin() ) );
    }

    @Override
    protected IFigure createFigure()
    {
        panel = createPanel();
        configurePanel( panel );

        return panel;
    }

    protected Panel createPanel()
    {
        return new Panel();
    }

    protected CanAddPortletLayouts getCastedModel()
    {
        return (CanAddPortletLayouts) getModel();
    }

    public int getContainerWidth()
    {
        if( panel != null ) //XXX to be continued, temporarily fix NullPointerException for parent column
        {
            return panel.getSize().width - ( getMargin() * 2 );
        }

        return 0;
    }

    public abstract int getMargin();

    protected ElementList<PortletLayoutElement> getModelChildren()
    {
        return getCastedModel().getPortletLayouts(); // return a list of rows
    }

    public int getPreferredColumnHeight()
    {
        int retval = DEFAULT_COLUMN_HEIGHT;

        int numRows = getRowPartsCount();

        if( numRows > 1 )
        {
            Rectangle partBounds = getFigure().getBounds();

            if( partBounds.height > 0 )
            {
                int partHeight = partBounds.height;
                int rowsHeight = partHeight - ( getMargin() * 2 );
                int totalColumnsHeight = rowsHeight - ( getRowPartsCount() * PortletLayoutEditPart.COLUMN_SPACING * 2 );
                int computedColumnHeight = totalColumnsHeight / numRows;

                retval = computedColumnHeight;
            }
        }

        return retval;
    }

    protected int getRowPartsCount()
    {
        return getChildren().size();
    }

    @Override
    public void refresh()
    {
        super.refresh();

        if( getChildren() != null )
        {
            refreshVisuals();
        }
    }

    @Override
    protected void refreshVisuals()
    {
        super.refreshVisuals();
        List children = getChildren();

        for( Object child : children )
        {
            if( child instanceof AbstractEditPart )
            {
                ( (AbstractEditPart) child ).refresh();
            }
        }
    }

}