/***********************************************************************************
* Copyright (c) 2015 /// Project SWG /// www.projectswg.com                        *
*                                                                                  *
* ProjectSWG is the first NGE emulator for Star Wars Galaxies founded on           *
* July 7th, 2011 after SOE announced the official shutdown of Star Wars Galaxies.  *
* Our goal is to create an emulator which will provide a server for players to     *
* continue playing a game similar to the one they used to play. We are basing      *
* it on the final publish of the game prior to end-game events.                    *
*                                                                                  *
* This file is part of Holocore.                                                   *
*                                                                                  *
* -------------------------------------------------------------------------------- *
*                                                                                  *
* Holocore is free software: you can redistribute it and/or modify                 *
* it under the terms of the GNU Affero General Public License as                   *
* published by the Free Software Foundation, either version 3 of the               *
* License, or (at your option) any later version.                                  *
*                                                                                  *
* Holocore is distributed in the hope that it will be useful,                      *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                   *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                    *
* GNU Affero General Public License for more details.                              *
*                                                                                  *
* You should have received a copy of the GNU Affero General Public License         *
* along with Holocore.  If not, see <http://www.gnu.org/licenses/>.                *
*                                                                                  *
***********************************************************************************/
package com.projectswg.lightspeed_frontend.communication;

import java.net.InetSocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;

import com.projectswg.common.control.Assert;
import com.projectswg.common.network.packets.Packet;
import com.projectswg.common.utilities.ThreadUtilities;
import com.projectswg.lightspeed.communication.LightspeedState;
import com.projectswg.lightspeed_frontend.communication.FrontendLightspeedSession.LightspeedSessionCallback;

public class FrontendCommunication {
	
	private final AtomicBoolean running;
	
	private ExecutorService executor;
	private FrontendLightspeedSession session;
	private LightspeedSessionCallback callback;
	
	public FrontendCommunication() {
		running = new AtomicBoolean(false);
		session = null;
		callback = null;
	}
	
	public boolean start() {
		if (running.getAndSet(true)) {
			Assert.fail();
			return false;
		}
		executor = Executors.newSingleThreadExecutor(ThreadUtilities.newThreadFactory("frontend-communication"));
		return true;
	}
	
	public boolean stop() {
		if (!running.getAndSet(false)) {
			Assert.fail();
			return false;
		}
		executor.shutdownNow();
		if (session != null) {
			session.disconnect();
			session = null;
		}
		return true;
	}
	
	public boolean isConnected() {
		return session != null && session.getState() == LightspeedState.CONNECTED;
	}
	
	public void setCallback(LightspeedSessionCallback callback) {
		if (session != null)
			session.setCallback(callback);
		this.callback = callback;
	}
	
	public void connect(InetSocketAddress addr) {
		if (addr == null)
			throw new NullPointerException();
		executor.execute(() -> {
			Assert.test(callback != null);
			if (session != null)
				session.disconnect();
			session = new FrontendLightspeedSession(addr);
			session.setCallback(callback);
			session.connect();
		});
	}
	
	public void disconnect() {
		executor.execute(() -> {
			Assert.test(session != null);
			if (session != null) {
				session.disconnect();
				session = null;
			}
		});
	}
	
	public void send(Packet p) {
		Assert.test(session != null);
		if (session != null)
			session.send(p);
	}
	
}