/*
 * 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.layer.cell.ILayerCell;
import org.eclipse.nebula.widgets.nattable.style.CellStyleAttributes;
import org.eclipse.nebula.widgets.nattable.style.DisplayMode;
import org.eclipse.nebula.widgets.nattable.style.IStyle;
import org.eclipse.nebula.widgets.nattable.util.GUIHelper;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.jowidgets.common.color.IColorConstant;
import org.jowidgets.common.model.ITableCell;
import org.jowidgets.common.types.Markup;
import org.jowidgets.spi.impl.swt.common.color.IColorCache;
import org.jowidgets.spi.impl.swt.common.color.RememberLastColorCache;
import org.jowidgets.spi.impl.swt.common.options.SwtOptions;
import org.jowidgets.spi.impl.swt.common.util.FontProvider;

final class JoCellTextPainter extends AbstractJoTextPainter {

    private final IColorConstant defaultSelectedForegroundColor;
    private final IColorCache foregroundColorCache;
    private final IColorCache selectedForegroundColorCache;

    private Color originalForeground;
    private Font originalFont;

    JoCellTextPainter() {
        this.defaultSelectedForegroundColor = SwtOptions.getTableSelectedForegroundColor();
        this.foregroundColorCache = new RememberLastColorCache();
        this.selectedForegroundColorCache = new RememberLastColorCache();
    }

    @Override
    void setupGC(final GC gc, final ILayerCell layerCell, final IStyle cellStyle) {
        final ITableCell tableCell = (ITableCell) layerCell.getDataValue();

        this.originalFont = gc.getFont();
        this.originalForeground = gc.getForeground();

        gc.setAntialias(GUIHelper.DEFAULT_ANTIALIAS);
        gc.setTextAntialias(GUIHelper.DEFAULT_TEXT_ANTIALIAS);
        gc.setFont(getFont(tableCell, cellStyle));
        gc.setForeground(getForegroundColor(tableCell, layerCell, cellStyle));
    }

    @Override
    public void resetGC(final GC gc) {
        gc.setFont(this.originalFont);
        gc.setForeground(this.originalForeground);
    }

    private Font getFont(final ITableCell cell, final IStyle style) {
        final Font result = style.getAttributeValue(CellStyleAttributes.FONT);
        final Markup markup = cell.getMarkup();
        if (markup != null && !Markup.DEFAULT.equals(markup)) {
            return FontProvider.deriveFont(result, markup);
        }
        else {
            return result;
        }
    }

    private Color getForegroundColor(final ITableCell tableCell, final ILayerCell layerCell, final IStyle style) {
        final Color defaultForeground = style.getAttributeValue(CellStyleAttributes.FOREGROUND_COLOR);

        if (DisplayMode.NORMAL.equals(layerCell.getDisplayMode())) {
            final IColorConstant foreground = tableCell.getForegroundColor();
            if (foreground != null) {
                return foregroundColorCache.getColor(foreground);
            }
        }
        else if (DisplayMode.SELECT.equals(layerCell.getDisplayMode())) {
            IColorConstant selectedForeground = tableCell.getSelectedForegroundColor();
            if (selectedForeground == null) {
                selectedForeground = defaultSelectedForegroundColor;
            }
            if (selectedForeground != null) {
                return selectedForegroundColorCache.getColor(selectedForeground);
            }
        }
        return defaultForeground != null ? defaultForeground : GUIHelper.COLOR_LIST_FOREGROUND;
    }

}