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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2013 Kahrl <kahrl@gmx.net>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef ITEMDEF_HEADER
#define ITEMDEF_HEADER

#include "irrlichttypes_extrabloated.h"
#include <string>
#include <iostream>
#include <set>
#include "itemgroup.h"
#include "sound.h"
class IGameDef;
struct ToolCapabilities;

/*
	Base item definition
*/

enum ItemType
{
	ITEM_NONE,
	ITEM_NODE,
	ITEM_CRAFT,
	ITEM_TOOL,
};

struct ItemDefinition
{
	/*
		Basic item properties
	*/
	ItemType type;
	std::string name; // "" = hand
	std::string description; // Shown in tooltip.

	/*
		Visual properties
	*/
	std::string inventory_image; // Optional for nodes, mandatory for tools/craftitems
	std::string wield_image; // If empty, inventory_image or mesh (only nodes) is used
	v3f wield_scale;

	/*
		Item stack and interaction properties
	*/
	u16 stack_max;
	bool usable;
	bool liquids_pointable;
	// May be NULL. If non-NULL, deleted by destructor
	ToolCapabilities *tool_capabilities;
	ItemGroupList groups;
	SimpleSoundSpec sound_place;
	SimpleSoundSpec sound_place_failed;
	f32 range;

	// Client shall immediately place this node when player places the item.
	// Server will update the precise end result a moment later.
	// "" = no prediction
	std::string node_placement_prediction;

	/*
		Some helpful methods
	*/
	ItemDefinition();
	ItemDefinition(const ItemDefinition &def);
	ItemDefinition& operator=(const ItemDefinition &def);
	~ItemDefinition();
	void reset();
	void serialize(std::ostream &os, u16 protocol_version) const;
	void deSerialize(std::istream &is);
private:
	void resetInitial();
};

class IItemDefManager
{
public:
	IItemDefManager(){}
	virtual ~IItemDefManager(){}

	// Get item definition
	virtual const ItemDefinition& get(const std::string &name) const=0;
	// Get alias definition
	virtual std::string getAlias(const std::string &name) const=0;
	// Get set of all defined item names and aliases
	virtual std::set<std::string> getAll() const=0;
	// Check if item is known
	virtual bool isKnown(const std::string &name) const=0;
#ifndef SERVER
	// Get item inventory texture
	virtual video::ITexture* getInventoryTexture(const std::string &name,
			IGameDef *gamedef) const=0;
	// Get item wield mesh
	virtual scene::IMesh* getWieldMesh(const std::string &name,
		IGameDef *gamedef) const=0;
#endif

	virtual void serialize(std::ostream &os, u16 protocol_version)=0;
};

class IWritableItemDefManager : public IItemDefManager
{
public:
	IWritableItemDefManager(){}
	virtual ~IWritableItemDefManager(){}

	// Get item definition
	virtual const ItemDefinition& get(const std::string &name) const=0;
	// Get alias definition
	virtual std::string getAlias(const std::string &name) const=0;
	// Get set of all defined item names and aliases
	virtual std::set<std::string> getAll() const=0;
	// Check if item is known
	virtual bool isKnown(const std::string &name) const=0;
#ifndef SERVER
	// Get item inventory texture
	virtual video::ITexture* getInventoryTexture(const std::string &name,
			IGameDef *gamedef) const=0;
	// Get item wield mesh
	virtual scene::IMesh* getWieldMesh(const std::string &name,
		IGameDef *gamedef) const=0;
#endif

	// Remove all registered item and node definitions and aliases
	// Then re-add the builtin item definitions
	virtual void clear()=0;
	// Register item definition
	virtual void registerItem(const ItemDefinition &def)=0;
	virtual void unregisterItem(const std::string &name)=0;
	// Set an alias so that items named <name> will load as <convert_to>.
	// Alias is not set if <name> has already been defined.
	// Alias will be removed if <name> is defined at a later point of time.
	virtual void registerAlias(const std::string &name,
			const std::string &convert_to)=0;

	virtual void serialize(std::ostream &os, u16 protocol_version)=0;
	virtual void deSerialize(std::istream &is)=0;

	// Do stuff asked by threads that can only be done in the main thread
	virtual void processQueue(IGameDef *gamedef)=0;
};

IWritableItemDefManager* createItemDefManager();

#endif
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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "server.h"
#include <iostream>
#include <queue>
#include <algorithm>
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "ban.h"
#include "environment.h"
#include "map.h"
#include "jthread/jmutexautolock.h"
#include "main.h"
#include "constants.h"
#include "voxel.h"
#include "config.h"
#include "version.h"
#include "filesys.h"
#include "mapblock.h"
#include "serverobject.h"
#include "genericobject.h"
#include "settings.h"
#include "profiler.h"
#include "log.h"
#include "scripting_game.h"
#include "nodedef.h"
#include "itemdef.h"
#include "craftdef.h"
#include "emerge.h"
#include "mapgen.h"
#include "mg_biome.h"
#include "content_mapnode.h"
#include "content_nodemeta.h"
#include "content_abm.h"
#include "content_sao.h"
#include "mods.h"
#include "sound.h" // dummySoundManager
#include "event_manager.h"
#include "serverlist.h"
#include "util/string.h"
#include "util/mathconstants.h"
#include "rollback.h"
#include "util/serialize.h"
#include "util/thread.h"
#include "defaultsettings.h"
#include "util/base64.h"
#include "util/sha1.h"
#include "util/hex.h"

class ClientNotFoundException : public BaseException
{
public:
	ClientNotFoundException(const char *s):
		BaseException(s)
	{}
};

class ServerThread : public JThread
{
	Server *m_server;

public:

	ServerThread(Server *server):
		JThread(),
		m_server(server)
	{
	}

	void * Thread();
};

void * ServerThread::Thread()
{
	log_register_thread("ServerThread");

	DSTACK(__FUNCTION_NAME);
	BEGIN_DEBUG_EXCEPTION_HANDLER

	m_server->AsyncRunStep(true);

	ThreadStarted();

	porting::setThreadName("ServerThread");

	while(!StopRequested())
	{
		try{
			//TimeTaker timer("AsyncRunStep() + Receive()");

			m_server->AsyncRunStep();

			m_server->Receive();

		}
		catch(con::NoIncomingDataException &e)
		{
		}
		catch(con::PeerNotFoundException &e)
		{
			infostream<<"Server: PeerNotFoundException"<<std::endl;
		}
		catch(ClientNotFoundException &e)
		{
		}
		catch(con::ConnectionBindFailed &e)
		{
			m_server->setAsyncFatalError(e.what());
		}
		catch(LuaError &e)
		{
			m_server->setAsyncFatalError(e.what());
		}
	}

	END_DEBUG_EXCEPTION_HANDLER(errorstream)

	return NULL;
}

v3f ServerSoundParams::getPos(ServerEnvironment *env, bool *pos_exists) const
{
	if(pos_exists) *pos_exists = false;
	switch(type){
	case SSP_LOCAL:
		return v3f(0,0,0);
	case SSP_POSITIONAL:
		if(pos_exists) *pos_exists = true;
		return pos;
	case SSP_OBJECT: {
		if(object == 0)
			return v3f(0,0,0);
		ServerActiveObject *sao = env->getActiveObject(object);
		if(!sao)
			return v3f(0,0,0);
		if(pos_exists) *pos_exists = true;
		return sao->getBasePosition(); }
	}
	return v3f(0,0,0);
}



/*
	Server
*/

Server::Server(
		const std::string &path_world,
		const SubgameSpec &gamespec,
		bool simple_singleplayer_mode,
		bool ipv6
	):
	m_path_world(path_world),
	m_gamespec(gamespec),
	m_simple_singleplayer_mode(simple_singleplayer_mode),
	m_async_fatal_error(""),
	m_env(NULL),
	m_con(PROTOCOL_ID,
			512,
			CONNECTION_TIMEOUT,
			ipv6,
			this),
	m_banmanager(NULL),
	m_rollback(NULL),
	m_enable_rollback_recording(false),
	m_emerge(NULL),
	m_script(NULL),
	m_itemdef(createItemDefManager()),
	m_nodedef(createNodeDefManager()),
	m_craftdef(createCraftDefManager()),
	m_event(new EventManager()),
	m_thread(NULL),
	m_time_of_day_send_timer(0),
	m_uptime(0),
	m_clients(&m_con),
	m_shutdown_requested(false),
	m_ignore_map_edit_events(false),
	m_ignore_map_edit_events_peer_id(0),
	m_next_sound_id(0)

{
	m_liquid_transform_timer = 0.0;
	m_liquid_transform_every = 1.0;
	m_print_info_timer = 0.0;
	m_masterserver_timer = 0.0;
	m_objectdata_timer = 0.0;
	m_emergethread_trigger_timer = 0.0;
	m_savemap_timer = 0.0;

	m_step_dtime = 0.0;
	m_lag = g_settings->getFloat("dedicated_server_step");

	if(path_world == "")
		throw ServerError("Supplied empty world path");

	if(!gamespec.isValid())
		throw ServerError("Supplied invalid gamespec");

	infostream<<"Server created for gameid \""<<m_gamespec.id<<"\"";
	if(m_simple_singleplayer_mode)
		infostream<<" in simple singleplayer mode"<<std::endl;
	else
		infostream<<std::endl;
	infostream<<"- world:  "<<m_path_world<<std::endl;
	infostream<<"- game:   "<<m_gamespec.path<<std::endl;

	// Initialize default settings and override defaults with those provided
	// by the game
	set_default_settings(g_settings);
	Settings gamedefaults;
	getGameMinetestConfig(gamespec.path, gamedefaults);
	override_default_settings(g_settings, &gamedefaults);

	// Create server thread
	m_thread = new ServerThread(this);

	// Create emerge manager
	m_emerge = new EmergeManager(this);

	// Create world if it doesn't exist
	if(!initializeWorld(m_path_world, m_gamespec.id))
		throw ServerError("Failed to initialize world");

	// Create ban manager
	std::string ban_path = m_path_world + DIR_DELIM "ipban.txt";
	m_banmanager = new BanManager(ban_path);

	ModConfiguration modconf(m_path_world);
	m_mods = modconf.getMods();
	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
	// complain about mods with unsatisfied dependencies
	if(!modconf.isConsistent())
	{
		for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it)
		{
			ModSpec mod = *it;
			errorstream << "mod \"" << mod.name << "\" has unsatisfied dependencies: ";
			for(std::set<std::string>::iterator dep_it = mod.unsatisfied_depends.begin();
				dep_it != mod.unsatisfied_depends.end(); ++dep_it)
				errorstream << " \"" << *dep_it << "\"";
			errorstream << std::endl;
		}
	}

	Settings worldmt_settings;
	std::string worldmt = m_path_world + DIR_DELIM + "world.mt";
	worldmt_settings.readConfigFile(worldmt.c_str());
	std::vector<std::string> names = worldmt_settings.getNames();
	std::set<std::string> load_mod_names;
	for(std::vector<std::string>::iterator it = names.begin();
		it != names.end(); ++it)
	{
		std::string name = *it;
		if(name.compare(0,9,"load_mod_")==0 && worldmt_settings.getBool(name))
			load_mod_names.insert(name.substr(9));
	}
	// complain about mods declared to be loaded, but not found
	for(std::vector<ModSpec>::iterator it = m_mods.begin();
			it != m_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	if(!load_mod_names.empty())
	{
		errorstream << "The following mods could not be found:";
		for(std::set<std::string>::iterator it = load_mod_names.begin();
			it != load_mod_names.end(); ++it)
			errorstream << " \"" << (*it) << "\"";
		errorstream << std::endl;
	}

	// Lock environment
	JMutexAutoLock envlock(m_env_mutex);

	// Load mapgen params from Settings
	m_emerge->loadMapgenParams();

	// Create the Map (loads map_meta.txt, overriding configured mapgen params)
	ServerMap *servermap = new ServerMap(path_world, this, m_emerge);

	// Initialize scripting
	infostream<<"Server: Initializing Lua"<<std::endl;

	m_script = new GameScripting(this);

	std::string scriptpath = getBuiltinLuaPath() + DIR_DELIM "init.lua";

	if (!m_script->loadScript(scriptpath))
		throw ModError("Failed to load and run " + scriptpath);

	// Print 'em
	infostream<<"Server: Loading mods: ";
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		infostream<<mod.name<<" ";
	}
	infostream<<std::endl;
	// Load and run "mod" scripts
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); i++){
		const ModSpec &mod = *i;
		std::string scriptpath = mod.path + DIR_DELIM + "init.lua";
		infostream<<"  ["<<padStringRight(mod.name, 12)<<"] [\""
				<<scriptpath<<"\"]"<<std::endl;
		bool success = m_script->loadMod(scriptpath, mod.name);
		if(!success){
			errorstream<<"Server: Failed to load and run "
					<<scriptpath<<std::endl;
			throw ModError("Failed to load and run "+scriptpath);
		}
	}

	// Read Textures and calculate sha1 sums
	fillMediaCache();

	// Apply item aliases in the node definition manager
	m_nodedef->updateAliases(m_itemdef);

	m_nodedef->setNodeRegistrationStatus(true);

	// Perform pending node name resolutions
	m_nodedef->runNodeResolverCallbacks();

	// Initialize Environment
	m_env = new ServerEnvironment(servermap, m_script, this, m_path_world);

	m_clients.setEnv(m_env);

	// Initialize mapgens
	m_emerge->initMapgens();

	m_enable_rollback_recording = g_settings->getBool("enable_rollback_recording");
	if (m_enable_rollback_recording) {
		// Create rollback manager
		m_rollback = new RollbackManager(m_path_world, this);
	}

	// Give environment reference to scripting api
	m_script->initializeEnvironment(m_env);

	// Register us to receive map edit events
	servermap->addEventReceiver(this);

	// If file exists, load environment metadata
	if(fs::PathExists(m_path_world + DIR_DELIM "env_meta.txt"))
	{
		infostream<<"Server: Loading environment metadata"<<std::endl;
		m_env->loadMeta();
	}

	// Add some test ActiveBlockModifiers to environment
	add_legacy_abms(m_env, m_nodedef);

	m_liquid_transform_every = g_settings->getFloat("liquid_update");
}

Server::~Server()
{
	infostream<<"Server destructing"<<std::endl;

	// Send shutdown message
	SendChatMessage(PEER_ID_INEXISTENT, L"*** Server shutting down");

	{
		JMutexAutoLock envlock(m_env_mutex);

		// Execute script shutdown hooks
		m_script->on_shutdown();

		infostream<<"Server: Saving players"<<std::endl;
		m_env->saveLoadedPlayers();

		infostream<<"Server: Saving environment metadata"<<std::endl;
		m_env->saveMeta();
	}

	// Stop threads
	stop();
	delete m_thread;

	// stop all emerge threads before deleting players that may have
	// requested blocks to be emerged
	m_emerge->stopThreads();

	// Delete things in the reverse order of creation
	delete m_env;

	// N.B. the EmergeManager should be deleted after the Environment since Map
	// depends on EmergeManager to write its current params to the map meta
	delete m_emerge;
	delete m_rollback;
	delete m_banmanager;
	delete m_event;
	delete m_itemdef;
	delete m_nodedef;
	delete m_craftdef;

	// Deinitialize scripting
	infostream<<"Server: Deinitializing scripting"<<std::endl;
	delete m_script;

	// Delete detached inventories
	for (std::map<std::string, Inventory*>::iterator
			i = m_detached_inventories.begin();
			i != m_detached_inventories.end(); i++) {
		delete i->second;
	}
}

void Server::start(Address bind_addr)
{
	DSTACK(__FUNCTION_NAME);

	m_bind_addr = bind_addr;

	infostream<<"Starting server on "
			<< bind_addr.serializeString() <<"..."<<std::endl;

	// Stop thread if already running
	m_thread->Stop();

	// Initialize connection
	m_con.SetTimeoutMs(30);
	m_con.Serve(bind_addr);

	// Start thread
	m_thread->Start();

	// ASCII art for the win!
	actionstream
	<<"        .__               __                   __   "<<std::endl
	<<"  _____ |__| ____   _____/  |_  ____   _______/  |_ "<<std::endl
	<<" /     \\|  |/    \\_/ __ \\   __\\/ __ \\ /  ___/\\   __\\"<<std::endl
	<<"|  Y Y  \\  |   |  \\  ___/|  | \\  ___/ \\___ \\  |  |  "<<std::endl
	<<"|__|_|  /__|___|  /\\___  >__|  \\___  >____  > |__|  "<<std::endl
	<<"      \\/        \\/     \\/          \\/     \\/        "<<std::endl;
	actionstream<<"World at ["<<m_path_world<<"]"<<std::endl;
	actionstream<<"Server for gameid=\""<<m_gamespec.id
			<<"\" listening on "<<bind_addr.serializeString()<<":"
			<<bind_addr.getPort() << "."<<std::endl;
}

void Server::stop()
{
	DSTACK(__FUNCTION_NAME);

	infostream<<"Server: Stopping and waiting threads"<<std::endl;

	// Stop threads (set run=false first so both start stopping)
	m_thread->Stop();
	//m_emergethread.setRun(false);
	m_thread->Wait();
	//m_emergethread.stop();

	infostream<<"Server: Threads stopped"<<std::endl;
}

void Server::step(float dtime)
{
	DSTACK(__FUNCTION_NAME);
	// Limit a bit
	if(dtime > 2.0)
		dtime = 2.0;
	{
		JMutexAutoLock lock(m_step_dtime_mutex);
		m_step_dtime += dtime;
	}
	// Throw if fatal error occurred in thread
	std::string async_err = m_async_fatal_error.get();
	if(async_err != ""){
		throw ServerError(async_err);
	}
}

void Server::AsyncRunStep(bool initial_step)
{
	DSTACK(__FUNCTION_NAME);

	g_profiler->add("Server::AsyncRunStep (num)", 1);

	float dtime;
	{
		JMutexAutoLock lock1(m_step_dtime_mutex);
		dtime = m_step_dtime;
	}

	{
		// Send blocks to clients
		SendBlocks(dtime);
	}

	if((dtime < 0.001) && (initial_step == false))
		return;

	g_profiler->add("Server::AsyncRunStep with dtime (num)", 1);

	//infostream<<"Server steps "<<dtime<<std::endl;
	//infostream<<"Server::AsyncRunStep(): dtime="<<dtime<<std::endl;

	{
		JMutexAutoLock lock1(m_step_dtime_mutex);
		m_step_dtime -= dtime;
	}

	/*
		Update uptime
	*/
	{
		m_uptime.set(m_uptime.get() + dtime);
	}

	handlePeerChanges();

	/*
		Update time of day and overall game time
	*/
	{
		JMutexAutoLock envlock(m_env_mutex);

		m_env->setTimeOfDaySpeed(g_settings->getFloat("time_speed"));

		/*
			Send to clients at constant intervals
		*/

		m_time_of_day_send_timer -= dtime;
		if(m_time_of_day_send_timer < 0.0)
		{
			m_time_of_day_send_timer = g_settings->getFloat("time_send_interval");
			u16 time = m_env->getTimeOfDay();
			float time_speed = g_settings->getFloat("time_speed");
			SendTimeOfDay(PEER_ID_INEXISTENT, time, time_speed);
		}
	}

	{
		JMutexAutoLock lock(m_env_mutex);
		// Figure out and report maximum lag to environment
		float max_lag = m_env->getMaxLagEstimate();
		max_lag *= 0.9998; // Decrease slowly (about half per 5 minutes)
		if(dtime > max_lag){
			if(dtime > 0.1 && dtime > max_lag * 2.0)
				infostream<<"Server: Maximum lag peaked to "<<dtime
						<<" s"<<std::endl;
			max_lag = dtime;
		}
		m_env->reportMaxLagEstimate(max_lag);
		// Step environment
		ScopeProfiler sp(g_profiler, "SEnv step");
		ScopeProfiler sp2(g_profiler, "SEnv step avg", SPT_AVG);
		m_env->step(dtime);
	}

	static const float map_timer_and_unload_dtime = 2.92;
	if(m_map_timer_and_unload_interval.step(dtime, map_timer_and_unload_dtime))
	{
		JMutexAutoLock lock(m_env_mutex);
		// Run Map's timers and unload unused data
		ScopeProfiler sp(g_profiler, "Server: map timer and unload");
		m_env->getMap().timerUpdate(map_timer_and_unload_dtime,
				g_settings->getFloat("server_unload_unused_data_timeout"));
	}

	/*
		Do background stuff
	*/

	/*
		Handle players
	*/
	{
		JMutexAutoLock lock(m_env_mutex);

		std::list<u16> clientids = m_clients.getClientIDs();

		ScopeProfiler sp(g_profiler, "Server: handle players");

		for(std::list<u16>::iterator
			i = clientids.begin();
			i != clientids.end(); ++i)
		{
			PlayerSAO *playersao = getPlayerSAO(*i);
			if(playersao == NULL)
				continue;

			/*
				Handle player HPs (die if hp=0)
			*/
			if(playersao->m_hp_not_sent && g_settings->getBool("enable_damage"))
			{
				if(playersao->getHP() == 0)
					DiePlayer(*i);
				else
					SendPlayerHP(*i);
			}

			/*
				Send player breath if changed
			*/
			if(playersao->m_breath_not_sent) {
				SendPlayerBreath(*i);
			}

			/*
				Send player inventories if necessary
			*/
			if(playersao->m_moved) {
				SendMovePlayer(*i);
				playersao->m_moved = false;
			}
			if(playersao->m_inventory_not_sent) {
				UpdateCrafting(*i);
				SendInventory(*i);
			}
		}
	}

	/* Transform liquids */
	m_liquid_transform_timer += dtime;
	if(m_liquid_transform_timer >= m_liquid_transform_every)
	{
		m_liquid_transform_timer -= m_liquid_transform_every;

		JMutexAutoLock lock(m_env_mutex);

		ScopeProfiler sp(g_profiler, "Server: liquid transform");

		std::map<v3s16, MapBlock*> modified_blocks;
		m_env->getMap().transformLiquids(modified_blocks);
#if 0
		/*
			Update lighting
		*/
		core::map<v3s16, MapBlock*> lighting_modified_blocks;
		ServerMap &map = ((ServerMap&)m_env->getMap());
		map.updateLighting(modified_blocks, lighting_modified_blocks);

		// Add blocks modified by lighting to modified_blocks
		for(core::map<v3s16, MapBlock*>::Iterator
				i = lighting_modified_blocks.getIterator();
				i.atEnd() == false; i++)
		{
			MapBlock *block = i.getNode()->getValue();
			modified_blocks.insert(block->getPos(), block);
		}
#endif
		/*
			Set the modified blocks unsent for all the clients
		*/
		if(!modified_blocks.empty())
		{
			SetBlocksNotSent(modified_blocks);
		}
	}
	m_clients.step(dtime);

	m_lag += (m_lag > dtime ? -1 : 1) * dtime/100;
#if USE_CURL
	// send masterserver announce
	{
		float &counter = m_masterserver_timer;
		if(!isSingleplayer() && (!counter || counter >= 300.0) &&
				g_settings->getBool("server_announce"))
		{
			ServerList::sendAnnounce(counter ? "update" : "start",
					m_bind_addr.getPort(),
					m_clients.getPlayerNames(),
					m_uptime.get(),
					m_env->getGameTime(),
					m_lag,
					m_gamespec.id,
					m_emerge->params.mg_name,
					m_mods);
			counter = 0.01;
		}
		counter += dtime;
	}
#endif

	/*
		Check added and deleted active objects
	*/
	{
		//infostream<<"Server: Checking added and deleted active objects"<<std::endl;
		JMutexAutoLock envlock(m_env_mutex);

		m_clients.Lock();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		ScopeProfiler sp(g_profiler, "Server: checking added and deleted objs");

		// Radius inside which objects are active
		s16 radius = g_settings->getS16("active_object_send_range_blocks");
		s16 player_radius = g_settings->getS16("player_transfer_distance");

		if (player_radius == 0 && g_settings->exists("unlimited_player_transfer_distance") &&
				!g_settings->getBool("unlimited_player_transfer_distance"))
			player_radius = radius;

		radius *= MAP_BLOCKSIZE;
		player_radius *= MAP_BLOCKSIZE;

		for(std::map<u16, RemoteClient*>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{
			RemoteClient *client = i->second;

			// If definitions and textures have not been sent, don't
			// send objects either
			if (client->getState() < CS_DefinitionsSent)
				continue;

			Player *player = m_env->getPlayer(client->peer_id);
			if(player==NULL)
			{
				// This can happen if the client timeouts somehow
				/*infostream<<"WARNING: "<<__FUNCTION_NAME<<": Client "
						<<client->peer_id
						<<" has no associated player"<<std::endl;*/
				continue;
			}
			v3s16 pos = floatToInt(player->getPosition(), BS);

			std::set<u16> removed_objects;
			std::set<u16> added_objects;
			m_env->getRemovedActiveObjects(pos, radius, player_radius,
					client->m_known_objects, removed_objects);
			m_env->getAddedActiveObjects(pos, radius, player_radius,
					client->m_known_objects, added_objects);

			// Ignore if nothing happened
			if(removed_objects.empty() && added_objects.empty())
			{
				//infostream<<"active objects: none changed"<<std::endl;
				continue;
			}

			std::string data_buffer;

			char buf[4];

			// Handle removed objects
			writeU16((u8*)buf, removed_objects.size());
			data_buffer.append(buf, 2);
			for(std::set<u16>::iterator
					i = removed_objects.begin();
					i != removed_objects.end(); ++i)
			{
				// Get object
				u16 id = *i;
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);

				// Remove from known objects
				client->m_known_objects.erase(id);

				if(obj && obj->m_known_by_count > 0)
					obj->m_known_by_count--;
			}

			// Handle added objects
			writeU16((u8*)buf, added_objects.size());
			data_buffer.append(buf, 2);
			for(std::set<u16>::iterator
					i = added_objects.begin();
					i != added_objects.end(); ++i)
			{
				// Get object
				u16 id = *i;
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Get object type
				u8 type = ACTIVEOBJECT_TYPE_INVALID;
				if(obj == NULL)
					infostream<<"WARNING: "<<__FUNCTION_NAME
							<<": NULL object"<<std::endl;
				else
					type = obj->getSendType();

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);
				writeU8((u8*)buf, type);
				data_buffer.append(buf, 1);

				if(obj)
					data_buffer.append(serializeLongString(
							obj->getClientInitializationData(client->net_proto_version)));
				else
					data_buffer.append(serializeLongString(""));

				// Add to known objects
				client->m_known_objects.insert(id);

				if(obj)
					obj->m_known_by_count++;
			}

			NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD, 0, client->peer_id);
			pkt->putRawString(data_buffer.c_str(), data_buffer.size());


			verbosestream << "Server: Sent object remove/add: "
					<< removed_objects.size() << " removed, "
					<< added_objects.size() << " added, "
					<< "packet size is " << pkt->getSize() << std::endl;

			Send(pkt);
		}
		m_clients.Unlock();
	}

	/*
		Send object messages
	*/
	{
		JMutexAutoLock envlock(m_env_mutex);
		ScopeProfiler sp(g_profiler, "Server: sending object messages");

		// Key = object id
		// Value = data sent by object
		std::map<u16, std::list<ActiveObjectMessage>* > buffered_messages;

		// Get active object messages from environment
		for(;;)
		{
			ActiveObjectMessage aom = m_env->getActiveObjectMessage();
			if(aom.id == 0)
				break;

			std::list<ActiveObjectMessage>* message_list = NULL;
			std::map<u16, std::list<ActiveObjectMessage>* >::iterator n;
			n = buffered_messages.find(aom.id);
			if(n == buffered_messages.end())
			{
				message_list = new std::list<ActiveObjectMessage>;
				buffered_messages[aom.id] = message_list;
			}
			else
			{
				message_list = n->second;
			}
			message_list->push_back(aom);
		}

		m_clients.Lock();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		// Route data to every client
		for(std::map<u16, RemoteClient*>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{
			RemoteClient *client = i->second;
			std::string reliable_data;
			std::string unreliable_data;
			// Go through all objects in message buffer
			for(std::map<u16, std::list<ActiveObjectMessage>* >::iterator
					j = buffered_messages.begin();
					j != buffered_messages.end(); ++j)
			{
				// If object is not known by client, skip it
				u16 id = j->first;
				if(client->m_known_objects.find(id) == client->m_known_objects.end())
					continue;
				// Get message list of object
				std::list<ActiveObjectMessage>* list = j->second;
				// Go through every message
				for(std::list<ActiveObjectMessage>::iterator
						k = list->begin(); k != list->end(); ++k)
				{
					// Compose the full new data with header
					ActiveObjectMessage aom = *k;
					std::string new_data;
					// Add object id
					char buf[2];
					writeU16((u8*)&buf[0], aom.id);
					new_data.append(buf, 2);
					// Add data
					new_data += serializeString(aom.datastring);
					// Add data to buffer
					if(aom.reliable)
						reliable_data += new_data;
					else
						unreliable_data += new_data;
				}
			}
			/*
				reliable_data and unreliable_data are now ready.
				Send them.
			*/
			if(reliable_data.size() > 0) {
				NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ACTIVE_OBJECT_MESSAGES,
						0, client->peer_id);

				pkt->putRawString(reliable_data.c_str(), reliable_data.size());
				Send(pkt);
			}

			if(unreliable_data.size() > 0) {
				NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ACTIVE_OBJECT_MESSAGES,
						0, client->peer_id);

				pkt->putRawString(unreliable_data.c_str(), unreliable_data.size());
				Send(pkt);
			}
		}
		m_clients.Unlock();

		// Clear buffered_messages
		for(std::map<u16, std::list<ActiveObjectMessage>* >::iterator
				i = buffered_messages.begin();
				i != buffered_messages.end(); ++i)
		{
			delete i->second;
		}
	}

	/*
		Send queued-for-sending map edit events.
	*/
	{
		// We will be accessing the environment
		JMutexAutoLock lock(m_env_mutex);

		// Don't send too many at a time
		//u32 count = 0;

		// Single change sending is disabled if queue size is not small
		bool disable_single_change_sending = false;
		if(m_unsent_map_edit_queue.size() >= 4)
			disable_single_change_sending = true;

		int event_count = m_unsent_map_edit_queue.size();

		// We'll log the amount of each
		Profiler prof;

		while(m_unsent_map_edit_queue.size() != 0)
		{
			MapEditEvent* event = m_unsent_map_edit_queue.pop_front();

			// Players far away from the change are stored here.
			// Instead of sending the changes, MapBlocks are set not sent
			// for them.
			std::list<u16> far_players;

			if(event->type == MEET_ADDNODE || event->type == MEET_SWAPNODE)
			{
				//infostream<<"Server: MEET_ADDNODE"<<std::endl;
				prof.add("MEET_ADDNODE", 1);
				if(disable_single_change_sending)
					sendAddNode(event->p, event->n, event->already_known_by_peer,
							&far_players, 5, event->type == MEET_ADDNODE);
				else
					sendAddNode(event->p, event->n, event->already_known_by_peer,
							&far_players, 30, event->type == MEET_ADDNODE);
			}
			else if(event->type == MEET_REMOVENODE)
			{
				//infostream<<"Server: MEET_REMOVENODE"<<std::endl;
				prof.add("MEET_REMOVENODE", 1);
				if(disable_single_change_sending)
					sendRemoveNode(event->p, event->already_known_by_peer,
							&far_players, 5);
				else
					sendRemoveNode(event->p, event->already_known_by_peer,
							&far_players, 30);
			}
			else if(event->type == MEET_BLOCK_NODE_METADATA_CHANGED)
			{
				infostream<<"Server: MEET_BLOCK_NODE_METADATA_CHANGED"<<std::endl;
				prof.add("MEET_BLOCK_NODE_METADATA_CHANGED", 1);
				setBlockNotSent(event->p);
			}
			else if(event->type == MEET_OTHER)
			{
				infostream<<"Server: MEET_OTHER"<<std::endl;
				prof.add("MEET_OTHER", 1);
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i)
				{
					setBlockNotSent(*i);
				}
			}
			else
			{
				prof.add("unknown", 1);
				infostream<<"WARNING: Server: Unknown MapEditEvent "
						<<((u32)event->type)<<std::endl;
			}

			/*
				Set blocks not sent to far players
			*/
			if(!far_players.empty())
			{
				// Convert list format to that wanted by SetBlocksNotSent
				std::map<v3s16, MapBlock*> modified_blocks2;
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i)
				{
					modified_blocks2[*i] =
							m_env->getMap().getBlockNoCreateNoEx(*i);
				}
				// Set blocks not sent
				for(std::list<u16>::iterator
						i = far_players.begin();
						i != far_players.end(); ++i)
				{
					u16 peer_id = *i;
					RemoteClient *client = getClient(peer_id);
					if(client==NULL)
						continue;
					client->SetBlocksNotSent(modified_blocks2);
				}
			}

			delete event;

			/*// Don't send too many at a time
			count++;
			if(count >= 1 && m_unsent_map_edit_queue.size() < 100)
				break;*/
		}

		if(event_count >= 5){
			infostream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(infostream);
		} else if(event_count != 0){
			verbosestream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(verbosestream);
		}

	}

	/*
		Trigger emergethread (it somehow gets to a non-triggered but
		bysy state sometimes)
	*/
	{
		float &counter = m_emergethread_trigger_timer;
		counter += dtime;
		if(counter >= 2.0)
		{
			counter = 0.0;

			m_emerge->startThreads();
		}
	}

	// Save map, players and auth stuff
	{
		float &counter = m_savemap_timer;
		counter += dtime;
		if(counter >= g_settings->getFloat("server_map_save_interval"))
		{
			counter = 0.0;
			JMutexAutoLock lock(m_env_mutex);

			ScopeProfiler sp(g_profiler, "Server: saving stuff");

			// Save ban file
			if (m_banmanager->isModified()) {
				m_banmanager->save();
			}

			// Save changed parts of map
			m_env->getMap().save(MOD_STATE_WRITE_NEEDED);

			// Save players
			m_env->saveLoadedPlayers();

			// Save environment metadata
			m_env->saveMeta();
		}
	}
}

void Server::Receive()
{
	DSTACK(__FUNCTION_NAME);
	SharedBuffer<u8> data;
	u16 peer_id;
	u32 datasize;
	try {
		datasize = m_con.Receive(peer_id,data);
		ProcessData(*data, datasize, peer_id);
	}
	catch(con::InvalidIncomingDataException &e) {
		infostream<<"Server::Receive(): "
				"InvalidIncomingDataException: what()="
				<<e.what()<<std::endl;
	}
	catch(SerializationError &e) {
		infostream<<"Server::Receive(): "
				"SerializationError: what()="
				<<e.what()<<std::endl;
	}
	catch(ClientStateError &e) {
		errorstream << "ProcessData: peer=" << peer_id  << e.what() << std::endl;
		DenyAccess(peer_id, L"Your client sent something server didn't expect."
				L"Try reconnecting or updating your client");
	}
	catch(con::PeerNotFoundException &e) {
		// Do nothing
	}
}

PlayerSAO* Server::StageTwoClientInit(u16 peer_id)
{
	std::string playername = "";
	PlayerSAO *playersao = NULL;
	m_clients.Lock();
	try {
		RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_InitDone);
		if (client != NULL) {
			playername = client->getName();
			playersao = emergePlayer(playername.c_str(), peer_id);
		}
	} catch (std::exception &e) {
		m_clients.Unlock();
		throw;
	}
	m_clients.Unlock();

	RemotePlayer *player =
		static_cast<RemotePlayer*>(m_env->getPlayer(playername.c_str()));

	// If failed, cancel
	if((playersao == NULL) || (player == NULL)) {
		if(player && player->peer_id != 0) {
			errorstream<<"Server: "<<playername<<": Failed to emerge player"
					<<" (player allocated to an another client)"<<std::endl;
			DenyAccess(peer_id, L"Another client is connected with this "
					L"name. If your client closed unexpectedly, try again in "
					L"a minute.");
		} else {
			errorstream<<"Server: "<<playername<<": Failed to emerge player"
					<<std::endl;
			DenyAccess(peer_id, L"Could not allocate player.");
		}
		return NULL;
	}

	/*
		Send complete position information
	*/
	SendMovePlayer(peer_id);

	// Send privileges
	SendPlayerPrivileges(peer_id);

	// Send inventory formspec
	SendPlayerInventoryFormspec(peer_id);

	// Send inventory
	UpdateCrafting(peer_id);
	SendInventory(peer_id);

	// Send HP
	if(g_settings->getBool("enable_damage"))
		SendPlayerHP(peer_id);

	// Send Breath
	SendPlayerBreath(peer_id);

	// Show death screen if necessary
	if(player->hp == 0)
		SendDeathscreen(peer_id, false, v3f(0,0,0));

	// Note things in chat if not in simple singleplayer mode
	if(!m_simple_singleplayer_mode) {
		// Send information about server to player in chat
		SendChatMessage(peer_id, getStatusString());

		// Send information about joining in chat
		{
			std::wstring name = L"unknown";
			Player *player = m_env->getPlayer(peer_id);
			if(player != NULL)
				name = narrow_to_wide(player->getName());

			std::wstring message;
			message += L"*** ";
			message += name;
			message += L" joined the game.";
			SendChatMessage(PEER_ID_INEXISTENT,message);
		}
	}
	Address addr = getPeerAddress(player->peer_id);
	std::string ip_str = addr.serializeString();
	actionstream<<player->getName() <<" [" << ip_str << "] joins game. " << std::endl;
	/*
		Print out action
	*/
	{
		std::vector<std::string> names = m_clients.getPlayerNames();

		actionstream<<player->getName() <<" joins game. List of players: ";

		for (std::vector<std::string>::iterator i = names.begin();
				i != names.end(); i++) {
			actionstream << *i << " ";
		}

		actionstream << player->getName() <<std::endl;
	}
	return playersao;
}

inline void Server::handleCommand(NetworkPacket* pkt)
{
	const ToServerCommandHandler& opHandle = toServerCommandTable[pkt->getCommand()];
	(this->*opHandle.handler)(pkt);
}

void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	// Environment is locked first.
	JMutexAutoLock envlock(m_env_mutex);

	ScopeProfiler sp(g_profiler, "Server::ProcessData");

	try {
		Address address = getPeerAddress(peer_id);
		std::string addr_s = address.serializeString();

		if(m_banmanager->isIpBanned(addr_s)) {
			std::string ban_name = m_banmanager->getBanName(addr_s);
			infostream << "Server: A banned client tried to connect from "
					<< addr_s << "; banned name was "
					<< ban_name << std::endl;
			// This actually doesn't seem to transfer to the client
			DenyAccess(peer_id, L"Your ip is banned. Banned name was "
					+ narrow_to_wide(ban_name));
			return;
		}
	}
	catch(con::PeerNotFoundException &e) {
		/*
		 * no peer for this packet found
		 * most common reason is peer timeout, e.g. peer didn't
		 * respond for some time, your server was overloaded or
		 * things like that.
		 */
		infostream << "Server::ProcessData(): Cancelling: peer "
				<< peer_id << " not found" << std::endl;
		return;
	}

	try {
		if(datasize < 2)
			return;

		NetworkPacket* pkt = new NetworkPacket(data, datasize, peer_id);

		ToServerCommand command = (ToServerCommand) pkt->getCommand();

		// Command must be handled into ToServerCommandHandler
		if (command >= TOSERVER_NUM_MSG_TYPES) {
			infostream << "Server: Ignoring unknown command "
					 << command << std::endl;
		}

		if (toServerCommandTable[command].state == TOSERVER_STATE_NOT_CONNECTED) {
			handleCommand(pkt);
			delete pkt;
			return;
		}

		u8 peer_ser_ver = getClient(peer_id, CS_InitDone)->serialization_version;

		if(peer_ser_ver == SER_FMT_VER_INVALID) {
			errorstream << "Server::ProcessData(): Cancelling: Peer"
					" serialization format invalid or not initialized."
					" Skipping incoming command=" << command << std::endl;

			delete pkt;
			return;
		}

		/* Handle commands related to client startup */
		if (toServerCommandTable[command].state == TOSERVER_STATE_STARTUP) {
			handleCommand(pkt);
			delete pkt;
			return;
		}

		if (m_clients.getClientState(peer_id) < CS_Active) {
			if (command == TOSERVER_PLAYERPOS) return;

			errorstream << "Got packet command: " << command << " for peer id "
					<< peer_id << " but client isn't active yet. Dropping packet "
					<< std::endl;

			delete pkt;
			return;
		}

		handleCommand(pkt);
		delete pkt;

	}
	catch(SendFailedException &e) {
		errorstream << "Server::ProcessData(): SendFailedException: "
				<< "what=" << e.what()
				<< std::endl;
	}
}

void Server::setTimeOfDay(u32 time)
{
	m_env->setTimeOfDay(time);
	m_time_of_day_send_timer = 0;
}

void Server::onMapEditEvent(MapEditEvent *event)
{
	if(m_ignore_map_edit_events)
		return;
	if(m_ignore_map_edit_events_area.contains(event->getArea()))
		return;
	MapEditEvent *e = event->clone();
	m_unsent_map_edit_queue.push_back(e);
}

Inventory* Server::getInventory(const InventoryLocation &loc)
{
	switch (loc.type) {
	case InventoryLocation::UNDEFINED:
	case InventoryLocation::CURRENT_PLAYER:
		break;
	case InventoryLocation::PLAYER:
	{
		Player *player = m_env->getPlayer(loc.name.c_str());
		if(!player)
			return NULL;
		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return NULL;
		return playersao->getInventory();
	}
		break;
	case InventoryLocation::NODEMETA:
	{
		NodeMetadata *meta = m_env->getMap().getNodeMetadata(loc.p);
		if(!meta)
			return NULL;
		return meta->getInventory();
	}
		break;
	case InventoryLocation::DETACHED:
	{
		if(m_detached_inventories.count(loc.name) == 0)
			return NULL;
		return m_detached_inventories[loc.name];
	}
		break;
	default:
		assert(0);
	}
	return NULL;
}
void Server::setInventoryModified(const InventoryLocation &loc)
{
	switch(loc.type){
	case InventoryLocation::UNDEFINED:
		break;
	case InventoryLocation::PLAYER:
	{
		Player *player = m_env->getPlayer(loc.name.c_str());
		if(!player)
			return;
		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return;
		playersao->m_inventory_not_sent = true;
		playersao->m_wielded_item_not_sent = true;
	}
		break;
	case InventoryLocation::NODEMETA:
	{
		v3s16 blockpos = getNodeBlockPos(loc.p);

		MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
		if(block)
			block->raiseModified(MOD_STATE_WRITE_NEEDED);

		setBlockNotSent(blockpos);
	}
		break;
	case InventoryLocation::DETACHED:
	{
		sendDetachedInventory(loc.name,PEER_ID_INEXISTENT);
	}
		break;
	default:
		assert(0);
	}
}

void Server::SetBlocksNotSent(std::map<v3s16, MapBlock *>& block)
{
	std::list<u16> clients = m_clients.getClientIDs();
	m_clients.Lock();
	// Set the modified blocks unsent for all the clients
	for (std::list<u16>::iterator
		 i = clients.begin();
		 i != clients.end(); ++i) {
			RemoteClient *client = m_clients.lockedGetClientNoEx(*i);
			if (client != NULL)
				client->SetBlocksNotSent(block);
		}
	m_clients.Unlock();
}

void Server::peerAdded(con::Peer *peer)
{
	DSTACK(__FUNCTION_NAME);
	verbosestream<<"Server::peerAdded(): peer->id="
			<<peer->id<<std::endl;

	con::PeerChange c;
	c.type = con::PEER_ADDED;
	c.peer_id = peer->id;
	c.timeout = false;
	m_peer_change_queue.push_back(c);
}

void Server::deletingPeer(con::Peer *peer, bool timeout)
{
	DSTACK(__FUNCTION_NAME);
	verbosestream<<"Server::deletingPeer(): peer->id="
			<<peer->id<<", timeout="<<timeout<<std::endl;

	m_clients.event(peer->id, CSE_Disconnect);
	con::PeerChange c;
	c.type = con::PEER_REMOVED;
	c.peer_id = peer->id;
	c.timeout = timeout;
	m_peer_change_queue.push_back(c);
}

bool Server::getClientConInfo(u16 peer_id, con::rtt_stat_type type, float* retval)
{
	*retval = m_con.getPeerStat(peer_id,type);
	if (*retval == -1) return false;
	return true;
}

bool Server::getClientInfo(
		u16          peer_id,
		ClientState* state,
		u32*         uptime,
		u8*          ser_vers,
		u16*         prot_vers,
		u8*          major,
		u8*          minor,
		u8*          patch,
		std::string* vers_string
	)
{
	*state = m_clients.getClientState(peer_id);
	m_clients.Lock();
	RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_Invalid);

	if (client == NULL) {
		m_clients.Unlock();
		return false;
	}

	*uptime = client->uptime();
	*ser_vers = client->serialization_version;
	*prot_vers = client->net_proto_version;

	*major = client->getMajor();
	*minor = client->getMinor();
	*patch = client->getPatch();
	*vers_string = client->getPatch();

	m_clients.Unlock();

	return true;
}

void Server::handlePeerChanges()
{
	while(m_peer_change_queue.size() > 0)
	{
		con::PeerChange c = m_peer_change_queue.pop_front();

		verbosestream<<"Server: Handling peer change: "
				<<"id="<<c.peer_id<<", timeout="<<c.timeout
				<<std::endl;

		switch(c.type)
		{
		case con::PEER_ADDED:
			m_clients.CreateClient(c.peer_id);
			break;

		case con::PEER_REMOVED:
			DeleteClient(c.peer_id, c.timeout?CDR_TIMEOUT:CDR_LEAVE);
			break;

		default:
			assert("Invalid peer change event received!" == 0);
			break;
		}
	}
}

void Server::Send(NetworkPacket* pkt)
{
	m_clients.send(pkt->getPeerId(),
		clientCommandFactoryTable[pkt->getCommand()].channel,
		pkt,
		clientCommandFactoryTable[pkt->getCommand()].reliable);
}

void Server::SendMovement(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_MOVEMENT, 12 * sizeof(float), peer_id);

	*pkt << g_settings->getFloat("movement_acceleration_default");
	*pkt << g_settings->getFloat("movement_acceleration_air");
	*pkt << g_settings->getFloat("movement_acceleration_fast");
	*pkt << g_settings->getFloat("movement_speed_walk");
	*pkt << g_settings->getFloat("movement_speed_crouch");
	*pkt << g_settings->getFloat("movement_speed_fast");
	*pkt << g_settings->getFloat("movement_speed_climb");
	*pkt << g_settings->getFloat("movement_speed_jump");
	*pkt << g_settings->getFloat("movement_liquid_fluidity");
	*pkt << g_settings->getFloat("movement_liquid_fluidity_smooth");
	*pkt << g_settings->getFloat("movement_liquid_sink");
	*pkt << g_settings->getFloat("movement_gravity");

	Send(pkt);
}

void Server::SendHP(u16 peer_id, u8 hp)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HP, 1, peer_id);
	*pkt << hp;
	Send(pkt);
}

void Server::SendBreath(u16 peer_id, u16 breath)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_BREATH, 2, peer_id);
	*pkt << (u16) breath;
	Send(pkt);
}

void Server::SendAccessDenied(u16 peer_id,const std::wstring &reason)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ACCESS_DENIED, 0, peer_id);
	*pkt << reason;
	Send(pkt);
}

void Server::SendDeathscreen(u16 peer_id,bool set_camera_point_target,
		v3f camera_point_target)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_DEATHSCREEN, 1 + sizeof(v3f), peer_id);
	*pkt << set_camera_point_target << camera_point_target;
	Send(pkt);
}

void Server::SendItemDef(u16 peer_id,
		IItemDefManager *itemdef, u16 protocol_version)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ITEMDEF, 0, peer_id);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized ItemDefManager
	*/
	std::ostringstream tmp_os(std::ios::binary);
	itemdef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);
	pkt->putLongString(tmp_os2.str());

	// Make data buffer
	verbosestream << "Server: Sending item definitions to id(" << peer_id
			<< "): size=" << pkt->getSize() << std::endl;

	Send(pkt);
}

void Server::SendNodeDef(u16 peer_id,
		INodeDefManager *nodedef, u16 protocol_version)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_NODEDEF, 0, peer_id);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized NodeDefManager
	*/
	std::ostringstream tmp_os(std::ios::binary);
	nodedef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);

	pkt->putLongString(tmp_os2.str());

	// Make data buffer
	verbosestream << "Server: Sending node definitions to id(" << peer_id
			<< "): size=" << pkt->getSize() << std::endl;

	Send(pkt);
}

/*
	Non-static send methods
*/

void Server::SendInventory(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);

	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);

	playersao->m_inventory_not_sent = false;

	/*
		Serialize it
	*/

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_INVENTORY, 0, peer_id);

	std::ostringstream os;
	playersao->getInventory()->serialize(os);

	std::string s = os.str();

	pkt->putRawString(s.c_str(), s.size());
	Send(pkt);
}

void Server::SendChatMessage(u16 peer_id, const std::wstring &message)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_CHAT_MESSAGE, 0, peer_id);
	*pkt << message;

	if (peer_id != PEER_ID_INEXISTENT) {
		Send(pkt);
	}
	else {
		m_clients.sendToAll(0,pkt,true);
	}
}

void Server::SendShowFormspecMessage(u16 peer_id, const std::string &formspec,
                                     const std::string &formname)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_SHOW_FORMSPEC, 0 , peer_id);

	pkt->putLongString(FORMSPEC_VERSION_STRING + formspec);
	*pkt << formname;

	Send(pkt);
}

// Spawns a particle on peer with peer_id
void Server::SendSpawnParticle(u16 peer_id, v3f pos, v3f velocity, v3f acceleration,
				float expirationtime, float size, bool collisiondetection,
				bool vertical, std::string texture)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_SPAWN_PARTICLE, 0, peer_id);

	*pkt << pos << velocity << acceleration << expirationtime
			<< size << collisiondetection;
	pkt->putLongString(texture);
	*pkt << vertical;

	if (peer_id != PEER_ID_INEXISTENT) {
		Send(pkt);
	}
	else {
		m_clients.sendToAll(0,pkt,true);
	}
}

// Adds a ParticleSpawner on peer with peer_id
void Server::SendAddParticleSpawner(u16 peer_id, u16 amount, float spawntime, v3f minpos, v3f maxpos,
	v3f minvel, v3f maxvel, v3f minacc, v3f maxacc, float minexptime, float maxexptime,
	float minsize, float maxsize, bool collisiondetection, bool vertical, std::string texture, u32 id)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_ADD_PARTICLESPAWNER, 0, peer_id);

	*pkt << amount << spawntime << minpos << maxpos << minvel << maxvel
			<< minacc << maxacc << minexptime << maxexptime << minsize
			<< maxsize << collisiondetection;

	pkt->putLongString(texture);

	*pkt << id << vertical;

	if (peer_id != PEER_ID_INEXISTENT) {
		Send(pkt);
	}
	else {
		m_clients.sendToAll(0, pkt, true);
	}
}

void Server::SendDeleteParticleSpawner(u16 peer_id, u32 id)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_DELETE_PARTICLESPAWNER, 2, peer_id);

	// Ugly error in this packet
	*pkt << (u16) id;

	if (peer_id != PEER_ID_INEXISTENT) {
		Send(pkt);
	}
	else {
		m_clients.sendToAll(0, pkt, true);
	}

}

void Server::SendHUDAdd(u16 peer_id, u32 id, HudElement *form)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HUDADD, 0 , peer_id);

	*pkt << id << (u8) form->type << form->pos << form->name << form->scale
			<< form->text << form->number << form->item << form->dir
			<< form->align << form->offset << form->world_pos << form->size;

	Send(pkt);
}

void Server::SendHUDRemove(u16 peer_id, u32 id)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HUDRM, 4, peer_id);
	*pkt << id;
	Send(pkt);
}

void Server::SendHUDChange(u16 peer_id, u32 id, HudElementStat stat, void *value)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HUDCHANGE, 0, peer_id);
	*pkt << id << (u8) stat;

	switch (stat) {
		case HUD_STAT_POS:
		case HUD_STAT_SCALE:
		case HUD_STAT_ALIGN:
		case HUD_STAT_OFFSET:
			*pkt << *(v2f *) value;
			break;
		case HUD_STAT_NAME:
		case HUD_STAT_TEXT:
			*pkt << *(std::string *) value;
			break;
		case HUD_STAT_WORLD_POS:
			*pkt << *(v3f *) value;
			break;
		case HUD_STAT_SIZE:
			*pkt << *(v2s32 *) value;
			break;
		case HUD_STAT_NUMBER:
		case HUD_STAT_ITEM:
		case HUD_STAT_DIR:
		default:
			*pkt << *(u32 *) value;
			break;
	}

	Send(pkt);
}

void Server::SendHUDSetFlags(u16 peer_id, u32 flags, u32 mask)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HUD_SET_FLAGS, 4 + 4, peer_id);

	flags &= ~(HUD_FLAG_HEALTHBAR_VISIBLE | HUD_FLAG_BREATHBAR_VISIBLE);

	*pkt << flags << mask;

	Send(pkt);
}

void Server::SendHUDSetParam(u16 peer_id, u16 param, const std::string &value)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_HUD_SET_PARAM, 0, peer_id);
	*pkt << param << value;
	Send(pkt);
}

void Server::SendSetSky(u16 peer_id, const video::SColor &bgcolor,
		const std::string &type, const std::vector<std::string> &params)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_SET_SKY, 0, peer_id);
	*pkt << bgcolor << type << (u16) params.size();

	for(size_t i=0; i<params.size(); i++)
		*pkt << params[i];

	Send(pkt);
}

void Server::SendOverrideDayNightRatio(u16 peer_id, bool do_override,
		float ratio)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_OVERRIDE_DAY_NIGHT_RATIO,
			1 + 2, peer_id);

	*pkt << do_override << (u16) (ratio * 65535);

	Send (pkt);
}

void Server::SendTimeOfDay(u16 peer_id, u16 time, f32 time_speed)
{
	DSTACK(__FUNCTION_NAME);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_TIME_OF_DAY, 0, peer_id);
	*pkt << time << time_speed;

	if (peer_id == PEER_ID_INEXISTENT) {
		m_clients.sendToAll(0, pkt, true);
	}
	else {
		Send(pkt);
	}
}

void Server::SendPlayerHP(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);
	playersao->m_hp_not_sent = false;
	SendHP(peer_id, playersao->getHP());
	m_script->player_event(playersao,"health_changed");

	// Send to other clients
	std::string str = gob_cmd_punched(playersao->readDamage(), playersao->getHP());
	ActiveObjectMessage aom(playersao->getId(), true, str);
	playersao->m_messages_out.push_back(aom);
}

void Server::SendPlayerBreath(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);
	playersao->m_breath_not_sent = false;
	m_script->player_event(playersao,"breath_changed");
	SendBreath(peer_id, playersao->getBreath());
}

void Server::SendMovePlayer(u16 peer_id)
{
	DSTACK(__FUNCTION_NAME);
	Player *player = m_env->getPlayer(peer_id);
	assert(player);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_MOVE_PLAYER, 0, peer_id);
	*pkt << player->getPosition() << player->getPitch() << player->getYaw();

	{
		v3f pos = player->getPosition();
		f32 pitch = player->getPitch();
		f32 yaw = player->getYaw();
		verbosestream<<"Server: Sending TOCLIENT_MOVE_PLAYER"
				<<" pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"
				<<" pitch="<<pitch
				<<" yaw="<<yaw
				<<std::endl;
	}

	Send(pkt);
}

void Server::SendLocalPlayerAnimations(u16 peer_id, v2s32 animation_frames[4], f32 animation_speed)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_LOCAL_PLAYER_ANIMATIONS, 0,
		peer_id);

	*pkt << animation_frames[0] << animation_frames[1] << animation_frames[2]
			<< animation_frames[3] << animation_speed;

	Send(pkt);
}

void Server::SendEyeOffset(u16 peer_id, v3f first, v3f third)
{
	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_EYE_OFFSET, 0, peer_id);
	*pkt << first << third;
	Send(pkt);
}
void Server::SendPlayerPrivileges(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	std::set<std::string> privs;
	m_script->getAuth(player->getName(), NULL, &privs);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_PRIVILEGES, 0, peer_id);
	*pkt << (u16) privs.size();

	for(std::set<std::string>::const_iterator i = privs.begin();
			i != privs.end(); i++) {
		*pkt << (*i);
	}

	Send(pkt);
}

void Server::SendPlayerInventoryFormspec(u16 peer_id)
{
	Player *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_INVENTORY_FORMSPEC, 0, peer_id);
	pkt->putLongString(FORMSPEC_VERSION_STRING + player->inventory_formspec);
	Send(pkt);
}

s32 Server::playSound(const SimpleSoundSpec &spec,
		const ServerSoundParams &params)
{
	// Find out initial position of sound
	bool pos_exists = false;
	v3f pos = params.getPos(m_env, &pos_exists);
	// If position is not found while it should be, cancel sound
	if(pos_exists != (params.type != ServerSoundParams::SSP_LOCAL))
		return -1;

	// Filter destination clients
	std::list<u16> dst_clients;
	if(params.to_player != "")
	{
		Player *player = m_env->getPlayer(params.to_player.c_str());
		if(!player){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not found"<<std::endl;
			return -1;
		}
		if(player->peer_id == PEER_ID_INEXISTENT){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not connected"<<std::endl;
			return -1;
		}
		dst_clients.push_back(player->peer_id);
	}
	else
	{
		std::list<u16> clients = m_clients.getClientIDs();

		for(std::list<u16>::iterator
				i = clients.begin(); i != clients.end(); ++i)
		{
			Player *player = m_env->getPlayer(*i);
			if(!player)
				continue;
			if(pos_exists){
				if(player->getPosition().getDistanceFrom(pos) >
						params.max_hear_distance)
					continue;
			}
			dst_clients.push_back(*i);
		}
	}
	if(dst_clients.empty())
		return -1;

	// Create the sound
	s32 id = m_next_sound_id++;
	// The sound will exist as a reference in m_playing_sounds
	m_playing_sounds[id] = ServerPlayingSound();
	ServerPlayingSound &psound = m_playing_sounds[id];
	psound.params = params;
	for(std::list<u16>::iterator i = dst_clients.begin();
			i != dst_clients.end(); i++)
		psound.clients.insert(*i);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_PLAY_SOUND, 0);
	*pkt << id << spec.name << (float) (spec.gain * params.gain)
			<< (u8) params.type << pos << params.object << params.loop;
	for(std::list<u16>::iterator i = dst_clients.begin();
			i != dst_clients.end(); i++) {
		// Send as reliable
		m_clients.send(*i, 0, pkt, true, false);
	}
	delete pkt;
	return id;
}
void Server::stopSound(s32 handle)
{
	// Get sound reference
	std::map<s32, ServerPlayingSound>::iterator i =
			m_playing_sounds.find(handle);
	if(i == m_playing_sounds.end())
		return;
	ServerPlayingSound &psound = i->second;

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_STOP_SOUND, 4);
	*pkt << handle;

	for(std::set<u16>::iterator i = psound.clients.begin();
			i != psound.clients.end(); i++) {
		// Send as reliable
		m_clients.send(*i, 0, pkt, true, false);
	}
	delete pkt;
	// Remove sound reference
	m_playing_sounds.erase(i);
}

void Server::sendRemoveNode(v3s16 p, u16 ignore_id,
	std::list<u16> *far_players, float far_d_nodes)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	NetworkPacket* pkt = new NetworkPacket(TOCLIENT_REMOVENODE, 6);
	*pkt << p;

	std::list<u16> clients = m_clients.getClientIDs();
	for(std::list<u16>::iterator
		i = clients.begin();
		i != clients.end(); ++i) {
		if(far_players) {
			// Get player
			if(Player *player = m_env->getPlayer(*i)) {
				// If player is far away, only set modified blocks not sent
				v3f player_pos = player->getPosition();
				if(player_pos.getDistanceFrom(p_f) > maxd) {
					far_players->push_back(*i);
					continue;
				}
			}
		}

		// Send as reliable
		m_clients.send(*i, 0, pkt, true, false);
	}
	// This loop needs the deletion of the packet here
	delete pkt;
}

void Server::sendAddNode(v3s16 p, MapNode n, u16 ignore_id,
		std::list<u16> *far_players, float far_d_nodes,
		bool remove_metadata)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	std::list<u16> clients = m_clients.getClientIDs();
	for(std::list<u16>::iterator
			i = clients.begin();
			i != clients.end(); ++i)
		{

		if(far_players)
		{
			// Get player
			Player *player = m_env->getPlayer(*i);