/*******************************************************************************
 * 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.core.model.internal;

import com.liferay.ide.layouttpl.core.model.LayoutTplElement;
import com.liferay.ide.layouttpl.core.model.PortletColumnElement;
import com.liferay.ide.layouttpl.core.model.PortletLayoutElement;

import org.eclipse.sapphire.Element;
import org.eclipse.sapphire.ElementList;
import org.eclipse.sapphire.InitialValueService;


/**
 * @author Kuo Zhang
 *
 */
public class PortletColumnWeightInitialValueService extends InitialValueService
{

    @Override
    protected String compute()
    {
        final PortletColumnElement column = (PortletColumnElement)context( Element.class );

        final PortletLayoutElement parentLayout = column.nearest( PortletLayoutElement.class );
        final LayoutTplElement layoutTpl = column.nearest( LayoutTplElement.class );

        int weightSum = 0;

        ElementList<PortletColumnElement> portletColumns = parentLayout.getPortletColumns();
        for( PortletColumnElement col : portletColumns )
        {
            if( col != column )
            {
                weightSum += col.getWeight().content().intValue();
            }
        }

        final int fullWeight = column.getFullWeight().content().intValue();
        int initialWeight = layoutTpl.getBootstrapStyle().content() ? 3 : 25;

        if( weightSum >=0 && weightSum < fullWeight )
        {
            initialWeight = fullWeight - weightSum;
        }
        else if( weightSum == fullWeight )
        {
            // the index of last valid column is portletColumns.size() - 2
            // because portletColumns().size() -1 is the new inserted column
            PortletColumnElement lastValidColumn = portletColumns.get( portletColumns.size() - 2 );
            int lastValidWeight = lastValidColumn.getWeight().content().intValue();

            if( lastValidWeight > 1 )
            {
                initialWeight = lastValidWeight / 2;
                lastValidWeight = lastValidWeight - initialWeight;
                lastValidColumn.setWeight( lastValidWeight );
            }
        }

        return String.valueOf( initialWeight );
    }

}