//
//  ========================================================================
//  Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.osgi.boot;

import java.util.ArrayList;
import java.util.Dictionary;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;

import org.eclipse.jetty.deploy.App;
import org.eclipse.jetty.osgi.boot.internal.serverfactory.ServerInstanceWrapper;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.BundleTracker;

/**
 * BundleContextProvider
 * <p>
 * Handles deploying OSGi bundles that define a context xml file for configuring them.
 */
public class BundleContextProvider extends AbstractContextProvider implements BundleProvider
{
    private static final Logger LOG = Log.getLogger(AbstractContextProvider.class);

    private Map<String, App> _appMap = new HashMap<String, App>();

    private Map<Bundle, List<App>> _bundleMap = new HashMap<Bundle, List<App>>();

    private ServiceRegistration _serviceRegForBundles;

    private BundleTracker _tracker;

    public class ContextBundleTracker extends BundleTracker
    {
        protected String _managedServerName;

        public ContextBundleTracker(BundleContext bundleContext, String managedServerName)
        {
            super(bundleContext, Bundle.ACTIVE | Bundle.STOPPING, null);
            _managedServerName = managedServerName;
        }

        /**
         * @see org.osgi.util.tracker.BundleTracker#addingBundle(org.osgi.framework.Bundle, org.osgi.framework.BundleEvent)
         */
        @Override
        public Object addingBundle(Bundle bundle, BundleEvent event)
        {
            try
            {
                String serverName = (String)bundle.getHeaders().get(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME);
                if ((StringUtil.isBlank(serverName) && _managedServerName.equals(OSGiServerConstants.MANAGED_JETTY_SERVER_DEFAULT_NAME)) ||
                    (!StringUtil.isBlank(serverName) && (serverName.equals(_managedServerName))))
                {
                    if (bundleAdded(bundle))
                        return bundle;
                }
            }
            catch (Exception e)
            {
                LOG.warn(e);
            }
            return null;
        }

        /**
         * @see org.osgi.util.tracker.BundleTracker#removedBundle(org.osgi.framework.Bundle, org.osgi.framework.BundleEvent, java.lang.Object)
         */
        @Override
        public void removedBundle(Bundle bundle, BundleEvent event, Object object)
        {
            try
            {
                bundleRemoved(bundle);
            }
            catch (Exception e)
            {
                LOG.warn(e);
            }
        }
    }

    public BundleContextProvider(ServerInstanceWrapper wrapper)
    {
        super(wrapper);
    }

    @Override
    protected void doStart() throws Exception
    {
        //Track bundles that are ContextHandlers that should be deployed
        _tracker = new ContextBundleTracker(FrameworkUtil.getBundle(this.getClass()).getBundleContext(), getServerInstanceWrapper().getManagedServerName());
        _tracker.open();

        //register as an osgi service for deploying contexts defined in a bundle, advertising the name of the jetty Server instance we are related to
        Dictionary<String, String> properties = new Hashtable<String, String>();
        properties.put(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME, getServerInstanceWrapper().getManagedServerName());
        _serviceRegForBundles = FrameworkUtil.getBundle(this.getClass()).getBundleContext().registerService(BundleProvider.class.getName(), this, properties);
        super.doStart();
    }

    @Override
    protected void doStop() throws Exception
    {
        _tracker.close();

        //unregister ourselves
        if (_serviceRegForBundles != null)
        {
            try
            {
                _serviceRegForBundles.unregister();
            }
            catch (Exception e)
            {
                LOG.warn(e);
            }
        }
    }

    @Override
    public boolean bundleAdded(Bundle bundle) throws Exception
    {
        if (bundle == null)
            return false;

        //If the bundle defines a Web-ContextPath then its probably a webapp and the BundleWebAppProvider should deploy it
        if (bundle.getHeaders().get(OSGiWebappConstants.RFC66_WEB_CONTEXTPATH) != null)
        {
            if (LOG.isDebugEnabled())
                LOG.debug("BundleContextProvider ignoring bundle {} with {} set", bundle.getSymbolicName(), OSGiWebappConstants.RFC66_WEB_CONTEXTPATH);
            return false;
        }

        String contextFiles = (String)bundle.getHeaders().get(OSGiWebappConstants.JETTY_CONTEXT_FILE_PATH);
        if (contextFiles == null)
            contextFiles = (String)bundle.getHeaders().get(OSGiWebappConstants.SERVICE_PROP_CONTEXT_FILE_PATH);

        if (contextFiles == null)
            return false;

        boolean added = false;
        //bundle defines JETTY_CONTEXT_FILE_PATH header,
        //a comma separated list of context xml files that each define a ContextHandler
        //TODO: (could be WebAppContexts)       
        String[] tmp = contextFiles.split("[,;]");
        for (String contextFile : tmp)
        {
            String originId = bundle.getSymbolicName() + "-" + bundle.getVersion().toString() + "-" + contextFile;
            OSGiApp app = new OSGiApp(getDeploymentManager(), this, originId, bundle, contextFile);
            _appMap.put(originId, app);
            List<App> apps = _bundleMap.get(bundle);
            if (apps == null)
            {
                apps = new ArrayList<App>();
                _bundleMap.put(bundle, apps);
            }
            apps.add(app);
            getDeploymentManager().addApp(app);
            added = true;
        }

        return added; //true if even 1 context from this bundle was added
    }

    /**
     * Bundle has been removed. If it was a context we deployed, undeploy it.
     *
     * @param bundle the bundle
     * @return true if this was a context we had deployed, false otherwise
     */
    @Override
    public boolean bundleRemoved(Bundle bundle) throws Exception
    {
        List<App> apps = _bundleMap.remove(bundle);
        boolean removed = false;
        if (apps != null)
        {
            for (App app : apps)
            {
                _appMap.remove(app.getOriginId());
                getDeploymentManager().removeApp(app);
                removed = true;
            }
        }
        return removed; //true if even 1 context was removed associated with this bundle
    }
}
