/*
 * Copyright (c) 2016, MGrossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.nattable.impl.plugin.painter;

import org.eclipse.nebula.widgets.nattable.config.IConfigRegistry;
import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
import org.eclipse.nebula.widgets.nattable.painter.cell.CellPainterWrapper;
import org.eclipse.nebula.widgets.nattable.painter.cell.ICellPainter;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.jowidgets.common.types.AlignmentHorizontal;
import org.jowidgets.util.Assert;

/**
 * Abstract painter that decorates underlying painter with horizontal alignment
 */
abstract class AbstractJoHorizontalAlignmentPainter extends CellPainterWrapper {

    AbstractJoHorizontalAlignmentPainter(final ICellPainter cellPainter) {
        super(Assert.getParamNotNull(cellPainter, "cellPainter"));
    }

    abstract AlignmentHorizontal getHorizontalAlignment(ILayerCell cell);

    @Override
    public void paintCell(final ILayerCell cell, final GC gc, final Rectangle rectangle, final IConfigRegistry configRegistry) {

        final int contentWidth = Math.min(rectangle.width, getPreferredWidth(cell, gc, configRegistry));
        final AlignmentHorizontal horizontalAlignment = getHorizontalAlignment(cell);
        final int horizontalAligmentPadding = getHorizontalAlignmentPadding(horizontalAlignment, rectangle, contentWidth);

        if (horizontalAligmentPadding > 0) {
            super.paintCell(
                    cell,
                    gc,
                    new Rectangle(
                        rectangle.x + horizontalAligmentPadding,
                        rectangle.y,
                        rectangle.width - horizontalAligmentPadding,
                        rectangle.height),
                    configRegistry);
        }
        else {
            super.paintCell(cell, gc, rectangle, configRegistry);
        }
    }

    private int getHorizontalAlignmentPadding(
        final AlignmentHorizontal alignment,
        final Rectangle rectangle,
        final int contentWidth) {

        if (AlignmentHorizontal.CENTER.equals(alignment)) {
            return Math.max(0, (rectangle.width - contentWidth) / 2);
        }
        else if (AlignmentHorizontal.RIGHT.equals(alignment)) {
            return Math.max(0, rectangle.width - contentWidth);
        }
        else {
            return 0;
        }
    }

}