/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * IBM Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.ptp.remote.remotetools.core;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.ptp.remote.core.IRemoteConnection;
import org.eclipse.ptp.remote.core.IRemoteConnectionChangeEvent;
import org.eclipse.ptp.remote.core.IRemoteConnectionChangeListener;
import org.eclipse.ptp.remote.core.IRemoteConnectionManager;
import org.eclipse.ptp.remote.remotetools.core.environment.PTPTargetControl;
import org.eclipse.ptp.remotetools.environment.EnvironmentPlugin;
import org.eclipse.ptp.remotetools.environment.control.ITargetControl;
import org.eclipse.ptp.remotetools.environment.core.ITargetElement;
import org.eclipse.ptp.remotetools.environment.core.TargetEnvironmentManager;
import org.eclipse.ptp.remotetools.environment.core.TargetTypeElement;


public class RemoteToolsConnectionManager implements IRemoteConnectionManager {
	private final ListenerList listeners = new ListenerList();
	private TargetTypeElement remoteHost = null;
	private Map<String, IRemoteConnection> connections = new HashMap<String, IRemoteConnection>();
	
	public RemoteToolsConnectionManager() {
		TargetEnvironmentManager targetMgr = EnvironmentPlugin.getDefault().getTargetsManager();
		for (Object obj : targetMgr.getTypeElements()) {
			TargetTypeElement element = (TargetTypeElement)obj;
			if (element.getName().equals("Remote Host")) {
				remoteHost = element;
				break;
			}
		}
		refreshConnections();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#addConnectionChangeListener(org.eclipse.ptp.remote.core.IRemoteConnectionChangeListener)
	 */
	public void addConnectionChangeListener(IRemoteConnectionChangeListener listener) {
		listeners.add(listener);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#fireConnectionChangeEvent(org.eclipse.ptp.remote.core.IRemoteConnectionChangeEvent)
	 */
	public void fireConnectionChangeEvent(IRemoteConnectionChangeEvent event) {
		for (Object listener : listeners.getListeners()) {
			((IRemoteConnectionChangeListener)listener).connectionChanged(event);
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#getConnection(java.lang.String)
	 */
	public IRemoteConnection getConnection(String name) {
		refreshConnections();
		return connections.get(name);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#getConnections()
	 */
	public IRemoteConnection[] getConnections() {
		refreshConnections();
		return connections.values().toArray(new IRemoteConnection[connections.size()]);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#removeConnection(org.eclipse.ptp.remote.core.IRemoteConnection)
	 */
	public void removeConnection(IRemoteConnection conn) {
		connections.remove(conn);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ptp.remote.core.IRemoteConnectionManager#removeConnectionChangeListener(org.eclipse.ptp.remote.core.IRemoteConnectionChangeListener)
	 */
	public void removeConnectionChangeListener(IRemoteConnectionChangeListener listener) {
		listeners.remove(listener);
	}

	/**
	 * Refresh the list of connections that we know about. Deals with connection that are added or deleted
	 * by another entity.
	 */
	private void refreshConnections() {
		Map<String, IRemoteConnection> newConns = new HashMap<String, IRemoteConnection>();
		for (Object obj : remoteHost.getElements()) {
			ITargetElement element = (ITargetElement)obj;
			IRemoteConnection conn = connections.get(element.getName());
			if (conn == null) {
				ITargetControl control;
				try {
					control = element.getControl();
					/*
					 * FIXME: need to work out how to get this information correctly!!!!
					 */
					String address = (String) element.getAttributes().get("ptp.connection-address");
					String user = (String) element.getAttributes().get("ptp.login-username");
					conn = new RemoteToolsConnection(element.getName(), address, user, (PTPTargetControl)control);
					((PTPTargetControl)control).setConnection(this, conn);
				} catch (CoreException e) {
				}
			}
			newConns.put(element.getName(), conn);
		}
		connections = newConns;
	}
}