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/**
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * Copyright (C) 2007 Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */



package org.richfaces.renderkit.html;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

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

import org.ajax4jsf.Messages;
import org.ajax4jsf.renderkit.RendererBase;
import org.ajax4jsf.renderkit.RendererUtils.HTML;
import org.richfaces.cdk.annotations.JsfRenderer;
import org.richfaces.component.AbstractMediaOutput;

/**
 * @author shura
 *
 */
@JsfRenderer(family = AbstractMediaOutput.COMPONENT_FAMILY) 
public class MediaOutputRenderer extends RendererBase {
    public static final String RENDERER_TYPE = "org.richfaces.MediaOutputRenderer";

    /**
     * Associationd between element name and uri attributes
     */
    private static final Map URI_ATTRIBUTES;

    static {
        URI_ATTRIBUTES = new HashMap();
        URI_ATTRIBUTES.put("a", "href");
        URI_ATTRIBUTES.put("img", "src");
        URI_ATTRIBUTES.put("object", "data");
        URI_ATTRIBUTES.put("link", "href");
    }

    /*
     *  (non-Javadoc)
     * @see org.ajax4jsf.renderkit.RendererBase#doEncodeEnd(javax.faces.context.ResponseWriter,
     * javax.faces.context.FacesContext, javax.faces.component.UIComponent)
     */
    @Override
    protected void doEncodeEnd(ResponseWriter writer, FacesContext context, UIComponent component) throws IOException {
        AbstractMediaOutput mmedia = (AbstractMediaOutput) component;
        String element = mmedia.getElement();

        if (null == element) {
            throw new FacesException(Messages.getMessage(Messages.NULL_ATTRIBUTE_ERROR, "element",
                    component.getClientId(context)));
        }

        writer.endElement(element);
    }

    /*
     *  (non-Javadoc)
     * @see org.ajax4jsf.renderkit.RendererBase#getComponentClass()
     */
    @Override
    protected Class getComponentClass() {

        // TODO Auto-generated method stub
        return AbstractMediaOutput.class;
    }

    /*
     *  (non-Javadoc)
     * @see org.ajax4jsf.renderkit.RendererBase#doEncodeBegin(javax.faces.context.ResponseWriter,
     * javax.faces.context.FacesContext, javax.faces.component.UIComponent)
     */
    @Override
    protected void doEncodeBegin(ResponseWriter writer, FacesContext context, UIComponent component)
        throws IOException {
        
        AbstractMediaOutput mmedia = (AbstractMediaOutput) component;
        String element = mmedia.getElement();

        if (null == element) {
            throw new FacesException(Messages.getMessage(Messages.NULL_ATTRIBUTE_ERROR, "element",
                    component.getClientId(context)));
        }

        String uriAttribute = mmedia.getUriAttribute();

        // Check for pre-defined attributes
        if (null == uriAttribute) {
            uriAttribute = URI_ATTRIBUTES.get(element);

            if (null == uriAttribute) {
                throw new FacesException(Messages.getMessage(Messages.NULL_ATTRIBUTE_ERROR, "uriAttribute",
                        component.getClientId(context)));
            }
        }

        writer.startElement(element, mmedia);
        getUtils().encodeId(context, component);

        StringBuilder uri = new StringBuilder(mmedia.getResource().getRequestPath());

        // Append parameters to resource Uri
        boolean haveQestion = uri.indexOf("?") >= 0;

        for (UIComponent child : component.getChildren()) {
            if (child instanceof UIParameter) {
                UIParameter uiParam = (UIParameter) child;
                String name = uiParam.getName();
                Object value = uiParam.getValue();

                if (null != value) {
                    if (haveQestion) {
                        uri.append('&');
                    } else {
                        uri.append('?');
                        haveQestion = true;
                    }

                    uri.append(name).append('=').append(value.toString());
                }
            }
        }

        writer.writeURIAttribute(uriAttribute, uri, "uri");
        getUtils().encodeAttributesFromArray(context, component, HTML.PASS_THRU_STYLES);
        getUtils().encodePassThru(context, mmedia, null);
    }
}