/*
 * ZeroTier One - Network Virtualization Everywhere
 * Copyright (C) 2011-2015  ZeroTier, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * --
 *
 * ZeroTier may be used and distributed under the terms of the GPLv3, which
 * are available at: http://www.gnu.org/licenses/gpl-3.0.html
 *
 * If you would like to embed ZeroTier into a commercial application or
 * redistribute it in a modified binary form, please contact ZeroTier Networks
 * LLC. Start here: http://www.zerotier.com/
 */

#ifndef ZT_RUNTIMEENVIRONMENT_HPP
#define ZT_RUNTIMEENVIRONMENT_HPP

#include <string>

#include "Constants.hpp"
#include "Identity.hpp"

namespace ZeroTier {

class NodeConfig;
class Logger;
class Switch;
class Topology;
class CMWC4096;
class Node;
class SoftwareUpdater;
class SocketManager;
class Multicaster;
class AntiRecursion;
class EthernetTapFactory;
class RoutingTable;
class HttpClient;
class NetworkConfigMaster;

/**
 * Holds global state for an instance of ZeroTier::Node
 * 
 * I do not believe in mutable static variables, period, or in global static
 * instances of objects that don't basically represent constants. It makes
 * unit testing, embedding, threading, and other things hard and is poor
 * practice.
 * 
 * So we put everything that we would want to be global, like Logger, here
 * and we give everybody this as _r. The Node creates and initializes this
 * on startup and deletes things on shutdown.
 */
class RuntimeEnvironment
{
public:
	RuntimeEnvironment() :
		homePath(),
		identity(),
		initialized(false),
		tcpTunnelingEnabled(false),
		timeOfLastResynchronize(0),
		timeOfLastPacketReceived(0),
		tapFactory((EthernetTapFactory *)0),
		routingTable((RoutingTable *)0),
		sm((SocketManager *)0),
		netconfMaster((NetworkConfigMaster *)0),
		log((Logger *)0),
		prng((CMWC4096 *)0),
		http((HttpClient *)0),
		sw((Switch *)0),
		mc((Multicaster *)0),
		antiRec((AntiRecursion *)0),
		topology((Topology *)0),
		nc((NodeConfig *)0),
		node((Node *)0),
		updater((SoftwareUpdater *)0)
	{
	}

	// Full path to home folder
	std::string homePath;

	// This node's identity
	Identity identity;

	// Are we initialized?
	volatile bool initialized;

	// Are we in outgoing TCP failover mode?
	volatile bool tcpTunnelingEnabled;

	// Time network environment (e.g. fingerprint) last changed -- used to determine online-ness
	volatile uint64_t timeOfLastResynchronize;

	// Time last packet was received -- from anywhere. This is updated in Peer::receive()
	// via an ugly const_cast<>.
	volatile uint64_t timeOfLastPacketReceived;

	// These are passed in from outside and are not created or deleted by the ZeroTier node core
	EthernetTapFactory *tapFactory;
	RoutingTable *routingTable;
	SocketManager *sm;
	NetworkConfigMaster *netconfMaster;

	/*
	 * Order matters a bit here. These are constructed in this order
	 * and then deleted in the opposite order on Node exit. The order ensures
	 * that things that are needed are there before they're needed.
	 *
	 * These are constant and never null after startup unless indicated.
	 */

	Logger *log; // null if logging is disabled
	CMWC4096 *prng;
	HttpClient *http;
	Switch *sw;
	Multicaster *mc;
	AntiRecursion *antiRec;
	Topology *topology;
	NodeConfig *nc;
	Node *node;
	SoftwareUpdater *updater; // null if software updates are not enabled
};

} // namespace ZeroTier

#endif