/**

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.trk.support.status;

import java.util.ArrayList;

import java.util.List;

import com.nokia.carbide.remoteconnections.RemoteConnectionsActivator;

import com.nokia.carbide.remoteconnections.interfaces.IConnectedService;

import com.nokia.carbide.remoteconnections.interfaces.IConnection;

import com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager;

import com.nokia.carbide.remoteconnections.interfaces.AbstractConnection.ConnectionStatus;

import com.nokia.carbide.remoteconnections.interfaces.IConnectedService.IStatus;

import com.nokia.carbide.remoteconnections.interfaces.IConnectedService.IStatusChangedListener;

import com.nokia.carbide.remoteconnections.interfaces.IConnectedService.IStatus.EStatus;

import com.nokia.carbide.remoteconnections.interfaces.IConnectionsManager.IConnectionListener;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatus;

import com.nokia.carbide.remoteconnections.internal.api.IConnection2.IConnectionStatus.EConnectionStatus;

import com.nokia.carbide.trk.support.Messages;

import com.nokia.carbide.trk.support.connection.USBConnectionType;

import com.nokia.carbide.trk.support.service.TRKConnectedService;

import com.nokia.carbide.trk.support.service.TracingConnectedService;

/**

 * A singleton object that manages the device status of dynamic connections

 * based on the status of the TRK and Tracing services.

 */

public class ConnectionStatusReconciler {

	private class ConnectionListener implements IConnectionListener {

		public void connectionAdded(IConnection connection) {

			addConnection(connection);

		}

		public void connectionRemoved(IConnection connection) {

			if (connection.equals(userSetCurrentConnection))

				userSetCurrentConnection = null;

			removeConnection(connection);

		}

		public void currentConnectionSet(IConnection connection) {

			if (connection != null && !connection.equals(reconcilerSetCurrentConnection))

				userSetCurrentConnection = connection;

		}

	}

	private class ServiceStatusListener implements IStatusChangedListener {

		public void statusChanged(IStatus status) {

			handleServiceStatusChange(status);

		}

	}

	private static ConnectionStatusReconciler instance;

	private IConnectionsManager manager;

	private IConnectionListener connectionListener;

	private List<IConnection> handledConnections;

	private ServiceStatusListener serviceStatusListener;

	private IConnection reconcilerSetCurrentConnection;

	private IConnection userSetCurrentConnection;

	private ConnectionStatusReconciler() {

		connectionListener = new ConnectionListener();

		manager = RemoteConnectionsActivator.getConnectionsManager();

		manager.addConnectionListener(connectionListener);

		handledConnections = new ArrayList<IConnection>();

		serviceStatusListener = new ServiceStatusListener();

	}

	public static ConnectionStatusReconciler getInstance() {

		if (instance == null)

			instance = new ConnectionStatusReconciler();

		return instance;

	}

	public void dispose() {

		manager.removeConnectionListener(connectionListener);

		for (IConnection connection : new ArrayList<IConnection>(handledConnections)) {

			removeConnection(connection);

		}

	}

	private boolean isDynamic(IConnection connection) {

		return connection instanceof IConnection2 && ((IConnection2) connection).isDynamic();

	}

	private boolean isSysTRK(TRKConnectedService service) {

		String value = service.getProperties().get(TRKConnectedService.PROP_SYS_TRK);

		return Boolean.parseBoolean(value);

	}

	private void addConnection(IConnection connection) {

		handledConnections.add(connection);

		for (IConnectedService service : manager.getConnectedServices(connection)) {

			if (service instanceof TRKConnectedService ||

					service instanceof TracingConnectedService) {

				service.addStatusChangedListener(serviceStatusListener);

			}

		}

	}

	private void reconcileAsCurrent(IConnection connection) {

		if (canBeSetToCurrent(connection)) {

			if (isReady(connection)) { // set as current

				reconcilerSetCurrentConnection = connection;

				manager.setCurrentConnection(connection);

			} else if (isNotReady(connection) && connection.equals(manager.getCurrentConnection())) { 

				// unset current or set something else current

				if (isDynamic(connection) && userSetCurrentConnection != null) {

					manager.setCurrentConnection(userSetCurrentConnection);

				}

				else {

					// look for some other existing connection that is ready

					for (IConnection c : manager.getConnections()) {

						if (canBeSetToCurrent(c) && isReady(c)) {

							reconcilerSetCurrentConnection = connection;

							manager.setCurrentConnection(connection);

							return;

						}

					}

					// set to no current connection

					manager.setCurrentConnection(null);

				}

			}

		}

	}

	private boolean isReady(IConnection connection) {

		return equalsConnectionStatus(connection, EConnectionStatus.READY);

	}

	private boolean isNotReady(IConnection connection) {

		return equalsConnectionStatus(connection, EConnectionStatus.NOT_READY);

	}

	private boolean equalsConnectionStatus(IConnection connection, EConnectionStatus status) {

		if (connection instanceof IConnection2) {

			IConnectionStatus connectionStatus = ((IConnection2) connection).getStatus();

			if (connectionStatus != null)

				return connectionStatus.getEConnectionStatus().equals(status);

		}

		return false;

	}

	private boolean canBeSetToCurrent(IConnection connection) {

		// USB connections for now

		return USBConnectionType.ID.equals(connection.getConnectionType().getIdentifier());

	}

	private void reconcileStatus(IConnection connection) {

		if (!isDynamic(connection)) // don't set status for user generated connections

			return;

		boolean isSysTRK = false;

		EStatus trkStatus = EStatus.UNKNOWN;

		EStatus traceStatus = EStatus.UNKNOWN;

		for (IConnectedService service : manager.getConnectedServices(connection)) {

			if (service instanceof TRKConnectedService) {

				isSysTRK = isSysTRK((TRKConnectedService) service);

				trkStatus = service.getStatus().getEStatus();

			}

			if (service instanceof TracingConnectedService) {

				traceStatus = service.getStatus().getEStatus();

			}

		}

		setConnectionStatus((IConnection2) connection, isSysTRK, trkStatus, traceStatus);

	}

	private void setConnectionStatus(IConnection2 connection, boolean isSysTRK, EStatus trkStatus, EStatus traceStatus) {

		// use trk status

		EConnectionStatus connectionStatus = service2ConnectionStatus(trkStatus);

		// if sys trk, tracing also used

		if (isSysTRK && connectionStatus.equals(EConnectionStatus.READY)) {

			connectionStatus = service2ConnectionStatus(traceStatus);

		}

		String shortDesc = getShortDescriptionForStatus(connectionStatus);

		StringBuilder longDesc = new StringBuilder(Messages.getString("ConnectionStatusReconciler_TRKServicePrefix")); //$NON-NLS-1$

		longDesc.append(getServiceStatusString(trkStatus));

		if (isSysTRK) {

			longDesc.append(Messages.getString("ConnectionStatusReconciler_TracingServicePrefix")); //$NON-NLS-1$

			longDesc.append(getServiceStatusString(traceStatus));

		}

		connection.setStatus(new ConnectionStatus(connectionStatus, shortDesc, longDesc.toString()));

	}

	private String getShortDescriptionForStatus(EConnectionStatus connectionStatus) {

		switch (connectionStatus) {

			case READY:

				return Messages.getString("ConnectionStatusReconciler_ReadyLabel"); //$NON-NLS-1$

			case NOT_READY:

				return Messages.getString("ConnectionStatusReconciler_NotReadyLabel"); //$NON-NLS-1$

			case IN_USE:

				return Messages.getString("ConnectionStatusReconciler_InUseLabel"); //$NON-NLS-1$

			case IN_USE_DISCONNECTED:

				return Messages.getString("ConnectionStatusReconciler_DisconnectedLabel"); //$NON-NLS-1$

			}

		return ""; //$NON-NLS-1$

	}

	private String getServiceStatusString(EStatus status) {

		switch (status) {

			case UP:

				return Messages.getString("ConnectionStatusReconciler_availableLabel"); //$NON-NLS-1$

			case DOWN:

				return Messages.getString("ConnectionStatusReconciler_unavailableLabel"); //$NON-NLS-1$

			case IN_USE:

				return Messages.getString("ConnectionStatusReconciler_inUseLabel_lower"); //$NON-NLS-1$

		}

		return ""; //$NON-NLS-1$

	}

	private EConnectionStatus service2ConnectionStatus(EStatus serviceStatus) {

		switch (serviceStatus) {

			case UP:

				return EConnectionStatus.READY;

			case DOWN:

				return EConnectionStatus.NOT_READY;

			case IN_USE:

				return EConnectionStatus.IN_USE;

		}

		return EConnectionStatus.NONE;

	}

	private void removeConnection(IConnection connection) {

		handledConnections.remove(connection);

	}

	private IConnection findConnection(IConnectedService cs) {

		for (IConnection connection : handledConnections) {

			for (IConnectedService connectedService : manager.getConnectedServices(connection)) {

				if (cs.equals(connectedService))

					return connection;

			}

		}

		return null;

	}

	public void handleServiceStatusChange(IStatus status) {

		IConnectedService service = status.getConnectedService();

		IConnection connection = findConnection(service);

		if (connection instanceof IConnection2) {

			reconcileStatus((IConnection2) connection);

		}

		if (connection != null)

			reconcileAsCurrent(connection);

	}

}