//----------------------------------------------------------------------
//
//  Filename: UsersResource.java
//  Description:
//
//  $Id:$
//
//----------------------------------------------------------------------

import java.io.IOException;

import org.restlet.Context;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.resource.Resource;
import org.restlet.data.Status;
import org.restlet.resource.DomRepresentation;
import org.restlet.resource.Representation;
import org.restlet.resource.Variant;


public class UsersResource extends Resource
{
    public UsersResource(Context context, Request request, Response response)
    {
        super(context, request, response);
        getVariants().add(new Variant(MediaType.TEXT_XML));
    }

	/**
	 * Returns the parent application.
	 * 
	 * @return the parent application.
	 */
	public ChatServer getApplication()
	{
	    return (ChatServer) getContext().getAttributes().get(ChatServer.KEY);
	}

	/**
	 * Returns the database container.
	 * 
	 * @return the database container.
	 */
	public ObjectContainer getContainer()
	{
	    return getApplication().getContainer();
	}

	/**
	 * Search the database for all user resources.
	 * @return a List of User references.
	 */
	public List<User> getUsers()
	{
	    // Create the query predicate
	    Predicate<User> predicate = new Predicate<User>()
	    {
	        private static final long serialVersionUID = 1L;
	
	        @Override
	        public boolean match(User candidate)
	        {
	            return true;                    
	        }
	    };
	
	    // Query the database and get the first result
	    List<User> users = getContainer().query(predicate);
	    return users;
	}

    /**
     * handle HTTP GET requests.
     */
    @Override
    public Representation getRepresentation(Variant variant)
    {
        DomRepresentation rep = null;
        if (variant.getMediaType().equals(MediaType.TEXT_XML))
        {
            try
            {
                rep = new DomRepresentation(MediaType.TEXT_XML);
                Document d = rep.getDocument();

				Element eltRoot = d.createElement("users");
				d.appendChild(eltRoot);
		        for (User user : getUsers())
		        {
		            user.fillNodes(d, eltRoot);
		        }

                d.normalizeDocument();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        return rep;
    }

    @Override
    public boolean allowDelete()
    {
        return false;
    }

    @Override
    public boolean allowPut()
    {
        return false;
    }

	@Override
	public boolean allowPost()
	{
		return true;
	}

	/**
	 * Handle HTTP POST. Create a new book resource.
	 */
	@Override
	public void post(Representation entity)
	{
        if (entity.getMediaType().equals(MediaType.APPLICATION_WWW_FORM, true))
        {
            // Parse the entity as a web form
            Form form = new Form(entity);

            // create a new User object
            User user = new Book();
            user.setUserName(form.getFirstValue("user[name]"));
            user.setHost(form.getFirstValue("user[host]"));
            user.setPort(Integer.parseInt(form.getFirstValue("user[port]")));
            user.setStatus(form.getFirstValue("user[status]").equals("available"));
            getResponse().setStatus(Status.SUCCESS_CREATED);

            // commit the changes.
            getContainer().set(user);
            getContainer().commit();
        }
        else
        {
            getResponse().setStatus(Status.CLIENT_ERROR_NOT_FOUND);
        }
	}
}