/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This 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 software 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.richfaces.ui.menu.toolbar;

import java.io.IOException;
import java.util.List;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import org.richfaces.cdk.annotations.JsfRenderer;
import org.richfaces.ui.common.HtmlConstants;

@JsfRenderer(type = ToolbarGroupRenderer.RENDERER_TYPE, family = AbstractToolbar.COMPONENT_FAMILY)
public class ToolbarGroupRenderer extends ToolbarRendererBase {
    public static final String RENDERER_TYPE = "org.richfaces.ui.ToolbarGroupRenderer";

    protected Class<? extends UIComponent> getComponentClass() {
        return AbstractToolbarGroup.class;
    }

    public boolean getRendersChildren() {
        return true;
    }

    @Override
    public void doEncodeChildren(ResponseWriter writer, FacesContext facesContext, UIComponent component) throws IOException {
        AbstractToolbarGroup toolbarGroup = (AbstractToolbarGroup) component;
        List<UIComponent> renderedChildren = toolbarGroup.getRenderedChildren();
        if (renderedChildren.size() <= 0) {
            return;
        }

        renderChild(facesContext, toolbarGroup, writer, renderedChildren.get(0));
        for (int i = 1; i < renderedChildren.size(); i++) {
            insertSeparatorIfNeed(facesContext, toolbarGroup, writer);
            renderChild(facesContext, toolbarGroup, writer, renderedChildren.get(i));
        }
    }

    private void renderChild(FacesContext facesContext, AbstractToolbarGroup toolbarGroup, ResponseWriter writer,
        UIComponent child) throws IOException {
        writer.startElement(HtmlConstants.TD_ELEM, toolbarGroup);
        writer.writeAttribute(HtmlConstants.ID_ATTRIBUTE, encodeClientItemID(child), null);
        writeClassValue(toolbarGroup, writer);
        writeStyleValue(toolbarGroup, writer);
        child.encodeAll(facesContext);
        writer.endElement(HtmlConstants.TD_ELEM);
    }

    /**
     * If toolBarGroup has "style" defined than parent toolBar attribute "style" will be ignored. Otherwise toolBarGroup will
     * inherit the value of the parent toolBar "style" attribute.
     *
     * @param toolbarGroup ToolBar Group to render
     * @param writer just writer
     * @throws IOException if something goes wrong with attribute writing
     */
    private void writeStyleValue(AbstractToolbarGroup toolbarGroup, ResponseWriter writer) throws IOException {
        String value;
        String style = getStringAttribute(toolbarGroup, HtmlConstants.STYLE_ATTRIBUTE);

        String toolbarStyle = getStringAttribute(getParentToolBar(toolbarGroup), "itemStyle");
        String tooolbarGroupStyle = getStringAttribute(toolbarGroup, "itemStyle");

        if (tooolbarGroupStyle != null && !tooolbarGroupStyle.equals("")) {
            value = concatStyles(tooolbarGroupStyle, style);
        } else {
            value = concatStyles(toolbarStyle, style);
        }

        if (isPropertyRendered(value)) {
            writer.writeAttribute(HtmlConstants.STYLE_ATTRIBUTE, value, null);
        }
    }

    /**
     * If toolBarGroup has "class" defined than parent toolBar attribute "class" will be ignored. Otherwise toolBarGroup will
     * inherit the value of the parent toolBar "class" attribute.
     *
     * @param toolbarGroup ToolBar Group to render
     * @param writer just writer
     * @throws IOException if something goes wrong with attribute writing
     */
    private void writeClassValue(AbstractToolbarGroup toolbarGroup, ResponseWriter writer) throws IOException {
        String styleClass = getStringAttribute(toolbarGroup, HtmlConstants.STYLE_CLASS_ATTR);

        String toolbarClass = getStringAttribute(getParentToolBar(toolbarGroup), "itemClass");
        String toolbarGroupClass = getStringAttribute(toolbarGroup, "itemClass");

        String itemClass = (toolbarGroupClass != null && !toolbarGroupClass.equals("")) ? toolbarGroupClass : toolbarClass;
        writer.writeAttribute(HtmlConstants.CLASS_ATTRIBUTE, concatClasses("rf-tb-itm", itemClass, styleClass), null);
    }

    private String getStringAttribute(UIComponent toolbarGroup, String attribute) {
        String value = (String) toolbarGroup.getAttributes().get(attribute);
        return null == value ? "" : value;
    }

    public AbstractToolbar getParentToolBar(UIComponent component) {
        return (component instanceof AbstractToolbarGroup) ? ((AbstractToolbarGroup) component).getToolBar() : null;
    }
}