/****************************************************************************
 * Copyright (c) 2007, 2011 IBM, Composent Inc. 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:
 *    Chris Aniszczyk - initial API and implementation
 *    Henrich Kraemer - Bug 297742 - [transport] Investigate how to maintain HTTP session 
 *****************************************************************************/
package org.eclipse.ecf.internal.provider.filetransfer.httpclient;

import javax.net.ssl.SSLSocketFactory;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.ecf.core.util.LogHelper;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.ServiceTracker;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator implements BundleActivator {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.ecf.provider.filetransfer.httpclient"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;
	private BundleContext context = null;

	private ServiceTracker logServiceTracker = null;

	private ServiceTracker sslSocketFactoryTracker;

	private ISSLSocketFactoryModifier sslSocketFactoryModifier;

	private ConnectionManagerHelper cmHelper;

	/**
	 * The constructor
	 */
	public Activator() {
		//
	}

	public BundleContext getContext() {
		return context;
	}

	public void start(BundleContext ctxt) throws Exception {
		plugin = this;
		this.context = ctxt;
		// initialize the default sslSocketFactoryModifier.  This instance is then used within HttpClientRetrieveFileTransfer.setupHostAndPort
		// to set the socket factory for the specific proxy and httpclient instance
		try {
			Class socketFactoryModifierClass = Class.forName("org.eclipse.ecf.internal.provider.filetransfer.httpclient.ssl.SSLSocketFactoryModifier"); //$NON-NLS-1$
			sslSocketFactoryModifier = (ISSLSocketFactoryModifier) socketFactoryModifierClass.newInstance();
		} catch (ClassNotFoundException e) {
			// will occur if fragment is not installed or not on proper execution environment
		} catch (Throwable t) {
			log(new Status(IStatus.ERROR, PLUGIN_ID, "Unexpected Error in Activator.start", t)); //$NON-NLS-1$
		}

	}

	public ConnectionManagerHelper getConnectionManagerHelper() {
		if (cmHelper == null) {
			cmHelper = new ConnectionManagerHelper();
		}
		return cmHelper;
	}

	public ISSLSocketFactoryModifier getSSLSocketFactoryModifier() {
		return sslSocketFactoryModifier;
	}

	public void stop(BundleContext ctxt) throws Exception {
		if (sslSocketFactoryModifier != null) {
			sslSocketFactoryModifier.dispose();
			sslSocketFactoryModifier = null;
		}

		if (sslSocketFactoryTracker != null) {
			sslSocketFactoryTracker.close();
		}

		if (logServiceTracker != null) {
			logServiceTracker.close();
		}
		if (cmHelper != null) {
			cmHelper.shutdown();
		}
		this.context = null;
		plugin = null;
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public synchronized static Activator getDefault() {
		if (plugin == null) {
			plugin = new Activator();
		}
		return plugin;
	}

	private synchronized LogService getLogService() {
		if (logServiceTracker == null) {
			logServiceTracker = new ServiceTracker(this.context, LogService.class.getName(), null);
			logServiceTracker.open();
		}
		return (LogService) logServiceTracker.getService();
	}

	public void log(IStatus status) {
		LogService logService = getLogService();
		if (logService != null) {
			logService.log(LogHelper.getLogCode(status), LogHelper.getLogMessage(status), status.getException());
		}
	}

	public synchronized SSLSocketFactory getSSLSocketFactory() {
		if (sslSocketFactoryTracker == null) {
			sslSocketFactoryTracker = new ServiceTracker(this.context, SSLSocketFactory.class.getName(), null);
			sslSocketFactoryTracker.open();
		}
		return (SSLSocketFactory) sslSocketFactoryTracker.getService();
	}

	public static void logNoProxyWarning(Throwable e) {
		Activator a = getDefault();
		if (a != null) {
			a.log(new Status(IStatus.WARNING, Activator.PLUGIN_ID, IStatus.ERROR, "Warning: Platform proxy API not available", e)); //$NON-NLS-1$
		}
	}

}