/*
 * 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.IRequestCycle;
import org.wamblee.photos.model.Album;
import org.wamblee.photos.model.Path;
import org.wamblee.photos.model.Photo;
import org.wamblee.photos.model.PhotoEntry;


/**
 * Base class for a photo or album page.  
 */
public abstract class PhotoEntryBean extends PhotosProtectedPage {
	 
	protected static final String IMAGE_URL_PREFIX = "image";
    
    /**
     * Relative path of the item. 
     */
    private Path _relativePath; 

    /**
     * Constructs the item. 
     */
    public PhotoEntryBean() {
        _relativePath = new Path("/");
    }
    
    /* (non-Javadoc)
     * @see org.apache.tapestry.AbstractPage#initialize()
     */
    @Override
    protected void initialize() {
        _relativePath = new Path("/");
    }
    
    /**
	 * @return Returns the photoAlbum.
	 */
	public PhotoAlbum getPhotoAlbum(IRequestCycle aCycle) {
		return ((PhotosEngine)getEngine()).getPhotoAlbum(aCycle);
	}

	/**
	 * @return Returns the relativePath.
	 */
	public String getRelativePath() {
		return _relativePath.toString();
	}

	/**
	 * @param relativePath The relativePath to set.
	 */
	public void setRelativePath(String relativePath) {
		if ( relativePath == null ) {
			// TODO investigate why null is passed
			//throw new IllegalArgumentException("relativePath is null");
			_relativePath = new Path("/");
			return;
		}
		_relativePath = new Path(relativePath);
	}

    /**
     * @return True if the item is a photo. 
     */
	public boolean isPhoto() {
       return getEntry() instanceof Photo;
    }
 
    /** 
     * @return True if the item is an album. 
     */
    public boolean isAlbum() {
        return getEntry() instanceof Album;
    }
    
    /**
     * Gets the corresponding photo entry. 
     * @return Photo entry. 
     */
    protected PhotoEntry getEntry() {
    	return getPhotoAlbum(getRequestCycle()).getEntry(getRelativePath());
    }

    /**
     * Gets the id of the item. 
     */
	public String getId() {
		return _relativePath.getId();  
	}
	
    /** 
     * @return Parent of the item. 
     */
	public Album getParentEntry() {
		String path = getEntry().getPath();
		path = new Path(path).parent().toString();
		return (Album)getPhotoAlbum(getRequestCycle()).getEntry(path); 
	}

    /**
     * Gets a reference to the home page. 
     * @return Home page reference. 
     */
	public AlbumPageRef getHome() {
		return new AlbumPageRef(1, 0, "/", !getRelativePath().equals("/"));
	}

    /**
     * Gets a reference to the parent. 
     * @return Parent page reference. 
     */
	public AlbumPageRef getParent() { 
		Path path = new Path(getRelativePath());
		if ( path.isRoot() ) {
			return new AlbumPageRef(1, 0, "", false);  
		}
		return new AlbumPageRef(1, 0, path.parent().toString(), true);
	}
    
    /**
     * @return The engine for the photos application. 
     */
    protected PhotosEngine getPhotosEngine() { 
        return (PhotosEngine)getEngine(); 
    }
}