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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2008 jOpenDocument, by ILM Informatique. All rights reserved.
 * 
 * The contents of this file are subject to the terms of the GNU
 * General Public License Version 3 only ("GPL").  
 * You may not use this file except in compliance with the License. 
 * You can obtain a copy of the License at http://www.gnu.org/licenses/gpl-3.0.html
 * See the License for the specific language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each file.
 * 
 */

package org.jopendocument.dom;

import java.awt.Color;

import org.jdom.Element;
import org.jdom.Namespace;

public abstract class StyleProperties {

    public static final Color TRANSPARENT = new Color(0, 0, 0, 0);
    public static final String TRANSPARENT_NAME = "transparent";

    static public final boolean parseBoolean(final String s, boolean def) {
        return s == null ? def : Boolean.parseBoolean(s);
    }

    static public final int parseInt(final String s, int def) {
        return s == null ? def : Integer.parseInt(s);
    }

    static public final Integer parseInteger(final String s) {
        return s == null ? null : Integer.valueOf(s);
    }

    private final Style parentStyle;
    private final String propPrefix;

    public StyleProperties(Style style, final String propPrefix) {
        this.parentStyle = style;
        this.propPrefix = propPrefix;
    }

    public final Style getParentStyle() {
        return this.parentStyle;
    }

    public final Element getElement() {
        return getElement(this.getParentStyle(), true);
    }

    protected final Element getElement(final Style s, final boolean create) {
        return s.getFormattingProperties(this.propPrefix, create);
    }

    private final String getAttributeValue(final Style s, final String attrName, final Namespace attrNS) {
        // e.g. no default style defined
        if (s == null)
            return null;
        final Element elem = this.getElement(s, false);
        if (elem == null)
            return null;
        return elem.getAttributeValue(attrName, attrNS);
    }

    // if a formatting property is not defined locally, the default style should be searched
    protected final String getAttributeValue(final String attrName, final Namespace attrNS) {
        final String localRes = getAttributeValue(this.getParentStyle(), attrName, attrNS);
        if (localRes != null)
            return localRes;
        if (this.getParentStyle() instanceof StyleStyle) {
            final StyleStyle defaultStyle = ((StyleStyle) this.getParentStyle()).getDefaultStyle();
            return getAttributeValue(defaultStyle, attrName, attrNS);
        } else {
            return null;
        }
    }

    protected final Namespace getNS(final String prefix) {
        return this.getParentStyle().getNS().getNS(prefix);
    }

    // * 20.173 fo:background-color of OpenDocument-v1.2-part1, usable with all our subclasses :
    // , , ,
    // , , ,
    // ,  and 

    public final String getRawBackgroundColor() {
        return this.getAttributeValue("background-color", this.getNS("fo"));
    }

    public final Color getBackgroundColor() {
        final String res = this.getRawBackgroundColor();
        if (res == null) {
            return null;
        } else if (TRANSPARENT_NAME.equals(res)) {
            return TRANSPARENT;
        } else
            return OOUtils.decodeRGB(res);
    }

    public final void setBackgroundColor(Color color) {
        this.setBackgroundColor(color.getAlpha() == TRANSPARENT.getAlpha() ? TRANSPARENT_NAME : OOUtils.encodeRGB(color));
    }

    public final void setBackgroundColor(String color) {
        this.getElement().setAttribute("background-color", color, this.getNS("fo"));
    }
}