/**
 * 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.ajax4jsf.resource;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Map;

import javax.faces.context.FacesContext;

/**
 * Interface for work with off-page internet resources ( images, scripts, styles etc. )
 * All instances must work in two phases - render page ( application set HTML code and attributes to reference resource )
 * and in concrete request to resource body.
 * For best performance, preffer to  realise it as "lightweght" pattern.
 *  
 * @author asmirnov@exadel.com (latest modification by $Author: nick_belaevski $)
 * @version $Revision: 1.1.2.2 $ $Date: 2007/01/11 16:52:15 $
 *
 */
public interface InternetResource {

	public static final String ENCODE_URI_PARAMETER = "org.ajax4jsf.ENCRYPT_RESOURCE_DATA";
	public static final String ENCODE_PASS_PARAMETER = "org.ajax4jsf.ENCRYPT_PASSWORD";
	public static final String CODEC_ATTR = "org.ajax4jsf.resource.CODEC";
	
	public static final String RESOURCE_PROTOCOL = "resource";
	public static final String RESOURCE_URI_PREFIX = "resource://";
	public static final int RESOURCE_URI_PREFIX_LENGTH = RESOURCE_URI_PREFIX.length();
	public static final String DATA_SEPARATOR = "/DATA/";
	static public final long DEFAULT_EXPIRE = 1000L * 60L * 60L * 24L;// 1 day
	/**
	 * @param resourceContext current {@link ResourceContext}
	 * @return Returns the contentLength.
	 */
	public int getContentLength(ResourceContext resourceContext);

	/**
	 * @param resourceContext current {@link ResourceContext}
	 * @return Returns the expired.
	 */
	public Date getExpired(ResourceContext resourceContext);

	/**
	 * @param resourceContext current {@link ResourceContext}
	 * @return Returns the lastModified.
	 */
	public Date getLastModified(ResourceContext resourceContext);

	/**
	 * @param resourceContext current {@link ResourceContext}
	 * @return Returns the cacheable.
	 */
	public boolean isCacheable(ResourceContext resourceContext);

	/**
	 * @param resourceContext current {@link ResourceContext}
	 * @return Returns the mimeType.
	 */
	public String getContentType(ResourceContext resourceContext);

	/**
	 * @param context TODO
	 * @return input stream with resource
	 */
	public InputStream getResourceAsStream(ResourceContext context);
	
	/**
	 * @return string with URI for get resource from  page.
	 */
	public String getUri(FacesContext context, Object data);


	
	/**
	 * Encode resource as Markup .
	 * @param context
	 * @param data
	 * @throws IOException 
	 */
	public void encode(FacesContext context, Object data) throws IOException;

	/**
	 * Encode resource as Markup with custom attributes  .
	 * @param context
	 * @param data
	 * @param attributes 
	 * @throws IOException 
	 */
	public void encode(FacesContext context, Object data, Map<String, Object> attributes) throws IOException;

	/**
	 * Encode start tag, attributes and body (  for inline script or style )
	 * @param context
	 * @param component
	 * @param attrs
	 * @throws IOException
	 */
	public void encodeBegin(FacesContext context, Object component, Map<String, Object> attrs) throws IOException;

	/**
	 * Encode closed tag.
	 * @param context
	 * @param component
	 * @throws IOException
	 */
	public void encodeEnd(FacesContext context, Object component) throws IOException;

	/**
	 * Send incapsulated resource to client by {@link ResourceContext} .
	 * @param context
	 */
	public void send(ResourceContext context) throws IOException;

	/**
	 * Set response headers based on resource properties ( mime type etc )
	 * TODO - send via {@link FacesContext } ??? 
	 * @param response
	 */
	public void sendHeaders(ResourceContext response);
	
	/**
	 * Custom properties for resource ( image size etc. )
	 * @param key
	 * @return property value, or null if not set.
	 */
	public Object getProperty(Object key);
	
	/**
	 * Set new value for custom property.
	 * @param key
	 * @param value
	 */
	void setProperty(Object key,Object value);


	/**
	 * Set concrete renderer ( for brige pattern ). In renderer, incapsulate encoding functions,
	 * content type, resource encoding.
	 * @param renderer
	 */
	public void setRenderer(ResourceRenderer renderer);
	
	/**
	 * @return true, if resource must be rendered in faces request cicle.
	 */
	public boolean requireFacesContext();

	/**
	 * Flag for check session-dependencies for resource. In application-wide case,
	 * resource URL not prepared by context.getExternalContext().encodeResourceURL(resourceURL)
	 * and used application-wide cache for store.
	 * @return
	 */
	public boolean isSessionAware();
	
	void setKey(String key);
	
	String getKey();

	public abstract ResourceRenderer getRenderer(ResourceContext resourceContext);

	public abstract void setSessionAware(boolean sessionAware);

	public abstract void setCacheable(boolean cacheable);

	public abstract void setLastModified(Date lastModified);

	public abstract void setExpired(Date expired);

}