/***********************************************************************************
 * 
 * Copyright (c) 2015 Kamil Baczkowicz
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 *    
 * The Eclipse Distribution License is available at
 *   http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 * 
 *    Kamil Baczkowicz - initial API and implementation and/or initial documentation
 *    
 */
package pl.baczkowicz.spy.ui.events.queuable;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

import pl.baczkowicz.spy.messages.FormattedMessage;
import pl.baczkowicz.spy.storage.BasicMessageStore;
import pl.baczkowicz.spy.ui.events.queuable.ui.BrowseReceivedMessageEvent;
import pl.baczkowicz.spy.ui.events.queuable.ui.BrowseRemovedMessageEvent;
import pl.baczkowicz.spy.ui.events.queuable.ui.SpyUIEvent;
import pl.baczkowicz.spy.ui.events.queuable.ui.TopicSummaryNewMessageEvent;
import pl.baczkowicz.spy.ui.events.queuable.ui.TopicSummaryRemovedMessageEvent;

public class EventQueueManager<T extends FormattedMessage>
{
	private Map<String, List<SpyUIEvent<T>>> events = new HashMap<>();  
	
	private AtomicLong eventCount = new AtomicLong();
	
	public EventQueueManager()
	{
		events.put(BrowseReceivedMessageEvent.class.toString(), new ArrayList<SpyUIEvent<T>>());
		events.put(BrowseRemovedMessageEvent.class.toString(), new ArrayList<SpyUIEvent<T>>());
		events.put(TopicSummaryNewMessageEvent.class.toString(), new ArrayList<SpyUIEvent<T>>());
		events.put(TopicSummaryRemovedMessageEvent.class.toString(), new ArrayList<SpyUIEvent<T>>());
	}
	
	public void add(final BasicMessageStore<T> parent, final SpyUIEvent<T> event)
	{
		// Not using the parent for now - as probably not needed any more
		
		final String eventType = event.getClass().toString();		
		
		synchronized (events)
		{
			final List<SpyUIEvent<T>> eventList = events.get(eventType);
			eventList.add(event);
		}
		
		eventCount.incrementAndGet();
	}	
	
	public List<SpyUIEvent<T>> getAndRemoveEvents(final String eventType)
	{		
		final List<SpyUIEvent<T>> eventList = events.get(eventType);
		
		synchronized (events)
		{
			events.put(eventType, new ArrayList<SpyUIEvent<T>>());
		}
		
		reduceCount(eventList.size());	
		return eventList;		
	}
	
	public Map<String, List<SpyUIEvent<T>>> getEvents()
	{
		return events;
	}
	
	public long getEventCount()
	{
		return eventCount.get();
	}
	
	private void reduceCount(final long reduceBy)
	{
		eventCount.addAndGet(-reduceBy);
	}
	
	// TODO: reading
	
	// TODO: processing in batches
}