/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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.argeo.cms.ui.jcr.model;
  
  import java.util.Map;
  
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.RepositoryFactory;
  import javax.jcr.Session;
  
  import org.argeo.api.NodeUtils;
  import org.argeo.api.security.Keyring;
  import org.argeo.cms.ArgeoNames;
  import org.argeo.cms.ui.jcr.RepositoryRegister;
  import org.argeo.eclipse.ui.EclipseUiException;
  import org.argeo.eclipse.ui.TreeParent;
  import org.argeo.eclipse.ui.dialogs.ErrorFeedback;
  
  /**
   * UI Tree component that implements the Argeo abstraction of a
   * {@link RepositoryFactory} that enable a user to "mount" various repositories
   * in a single Tree like View. It is usually meant to be at the root of the UI
   * Tree and thus {@link getParent()} method will return null.
   * 
   * The {@link RepositoryFactory} is injected at instantiation time and must be
   * use get or register new {@link Repository} objects upon which a reference is
   * kept here.
   */
  
  public class RepositoriesElem extends TreeParent implements ArgeoNames {
  	private final RepositoryRegister repositoryRegister;
  	private final RepositoryFactory repositoryFactory;
  
  	/**
  	 * A session of the logged in user on the default workspace of the node
  	 * repository.
  	 */
  	private final Session userSession;
  	private final Keyring keyring;
  
  	public RepositoriesElem(String name, RepositoryRegister repositoryRegister, RepositoryFactory repositoryFactory,
  			TreeParent parent, Session userSession, Keyring keyring) {
  		super(name);
  		this.repositoryRegister = repositoryRegister;
  		this.repositoryFactory = repositoryFactory;
  		this.userSession = userSession;
  		this.keyring = keyring;
  	}
  
  	/**
  	 * Override normal behavior to initialize the various repositories only at
  	 * request time
  	 */
  	@Override
  	public synchronized Object[] getChildren() {
  		if (isLoaded()) {
  			return super.getChildren();
  		} else {
  			// initialize current object
  			Map<String, Repository> refRepos = repositoryRegister.getRepositories();
  			for (String name : refRepos.keySet()) {
  				Repository repository = refRepos.get(name);
  				// if (repository instanceof MaintainedRepository)
  				// super.addChild(new MaintainedRepositoryElem(name,
  				// repository, this));
  				// else
  				super.addChild(new RepositoryElem(name, repository, this));
  			}
  
  			// remote
  			if (keyring != null) {
  				try {
  					addRemoteRepositories(keyring);
  				} catch (RepositoryException e) {
  					throw new EclipseUiException("Cannot browse remote repositories", e);
  				}
  			}
  			return super.getChildren();
  		}
  	}
  
  	protected void addRemoteRepositories(Keyring jcrKeyring) throws RepositoryException {
  		Node userHome = NodeUtils.getUserHome(userSession);
 		if (userHome != null && userHome.hasNode(ARGEO_REMOTE)) {
 			NodeIterator it = userHome.getNode(ARGEO_REMOTE).getNodes();
 			while (it.hasNext()) {
 				Node remoteNode = it.nextNode();
 				String uri = remoteNode.getProperty(ARGEO_URI).getString();
 				try {
 					RemoteRepositoryElem remoteRepositoryNode = new RemoteRepositoryElem(remoteNode.getName(),
 							repositoryFactory, uri, this, userSession, jcrKeyring, remoteNode.getPath());
 					super.addChild(remoteRepositoryNode);
 				} catch (Exception e) {
 					ErrorFeedback.show("Cannot add remote repository " + remoteNode, e);
 				}
 			}
 		}
 	}
 
 	public void registerNewRepository(String alias, Repository repository) {
 		// TODO: implement this
 		// Create a new RepositoryNode Object
 		// add it
 		// super.addChild(new RepositoriesNode(...));
 	}
 
 	/** Returns the {@link RepositoryRegister} wrapped by this object. */
 	public RepositoryRegister getRepositoryRegister() {
 		return repositoryRegister;
 	}
 }