/*
 * Copyright 2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 
package org.wamblee.photos.tapestry;

import org.apache.tapestry.IAsset;
import org.apache.tapestry.asset.ContextAsset;
import org.apache.tapestry.request.RequestContext;
import org.apache.tapestry.resource.ContextResourceLocation;
import org.wamblee.photos.model.Album;
import org.wamblee.photos.model.Path;
import org.wamblee.photos.model.Photo;
import org.wamblee.photos.model.PhotoEntry;

/**
 * Photo bean class for presenting a photo in a jsp.
 */
public class PhotoPage extends PhotoEntryBean {
    
    public static final String PAGE_NAME = "Photo";

	private static final String IMAGE_URL_PREFIX = "image";

	public PhotoPage() {
		super();
        initializeImpl();
	}
    
    /* (non-Javadoc)
     * @see org.wamblee.photos.tapestry.PhotoEntryBean#initialize()
     */
    @Override
    protected void initialize() {
        super.initialize();
        initializeImpl(); 
    }
    
    private void initializeImpl() { 
        // Empty
    }

	public EntryRef getPrev() {
		Album album = getParentAlbum();
		Photo prev = album.findPhotoBefore(getId());
		if (prev == null) {
			return null; 
		} 
		return new EntryRef(prev.getPath(), true, true);
	}

	public EntryRef getNext() {
		Album album = getParentAlbum();
		Photo next = album.findPhotoAfter(getId());
	    if ( next == null ) { 
	    	return null; 
	    }
		return new EntryRef(next.getPath(), true, true); 
	}

	public void setPhotoObject(PhotoEntry entry) {
		super.setRelativePath(entry.getPath());
	}

	/**
	 * @return
	 */
	private Album getParentAlbum() {
		Path path = new Path(getRelativePath());
		Path parent = path.parent();
		Album album = getPhotoAlbum(getRequestCycle()).getAlbum(parent.toString());
		return album;
	}

	public IAsset getCurrentImage() {
        RequestContext context = getPage().getRequestCycle().getRequestContext(); 
        String url = context.getResponse().encodeURL(IMAGE_URL_PREFIX + getRelativePath());
		ContextResourceLocation resourceLocation = new ContextResourceLocation(
				context.getServlet().getServletContext(), "/" + url);
		return new ContextAsset(resourceLocation, null);
	}
}