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/*
Minetest-c55
Copyright (C) 2010 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 General Public License as published by
the Free Software Foundation; either version 2 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef MAP_HEADER
#define MAP_HEADER

#include <jmutex.h>
#include <jthread.h>
#include <iostream>

#ifdef _WIN32
	#include <windows.h>
	#define sleep_s(x) Sleep((x*1000))
#else
	#include <unistd.h>
	#define sleep_s(x) sleep(x)
#endif

#include "common_irrlicht.h"
#include "mapnode.h"
#include "mapblock.h"
#include "mapsector.h"
#include "constants.h"
#include "voxel.h"
#include "mapchunk.h"
#include "nodemetadata.h"

#define MAPTYPE_BASE 0
#define MAPTYPE_SERVER 1
#define MAPTYPE_CLIENT 2

enum MapEditEventType{
	MEET_ADDNODE,
	MEET_REMOVENODE,
	MEET_OTHER
};

struct MapEditEvent
{
	MapEditEventType type;
	v3s16 p;
	MapNode n;
	core::map<v3s16, bool> modified_blocks;
	u16 already_known_by_peer;

	MapEditEvent():
		type(MEET_OTHER),
		already_known_by_peer(0)
	{
	}
	
	MapEditEvent * clone()
	{
		MapEditEvent *event = new MapEditEvent();
		event->type = type;
		event->p = p;
		event->n = n;
		for(core::map<v3s16, bool>::Iterator
				i = modified_blocks.getIterator();
				i.atEnd()==false; i++)
		{
			v3s16 p = i.getNode()->getKey();
			bool v = i.getNode()->getValue();
			event->modified_blocks.insert(p, v);
		}
		return event;
	}
};

class MapEventReceiver
{
public:
	// event shall be deleted by caller after the call.
	virtual void onMapEditEvent(MapEditEvent *event) = 0;
};

class Map : public NodeContainer
{
public:

	Map(std::ostream &dout);
	virtual ~Map();

	virtual u16 nodeContainerId() const
	{
		return NODECONTAINER_ID_MAP;
	}

	virtual s32 mapType() const
	{
		return MAPTYPE_BASE;
	}
	
	/*
		Drop (client) or delete (server) the map.
	*/
	virtual void drop()
	{
		delete this;
	}

	void addEventReceiver(MapEventReceiver *event_receiver);
	void removeEventReceiver(MapEventReceiver *event_receiver);
	// event shall be deleted by caller after the call.
	void dispatchEvent(MapEditEvent *event);

	// On failure returns NULL
	MapSector * getSectorNoGenerateNoExNoLock(v2s16 p2d);
	// On failure returns NULL
	MapSector * getSectorNoGenerateNoEx(v2s16 p2d);
	// On failure throws InvalidPositionException
	MapSector * getSectorNoGenerate(v2s16 p2d);
	// Gets an existing sector or creates an empty one
	//MapSector * getSectorCreate(v2s16 p2d);

	/*
		This is overloaded by ClientMap and ServerMap to allow
		their differing fetch methods.
	*/
	virtual MapSector * emergeSector(v2s16 p){ return NULL; }
	virtual MapSector * emergeSector(v2s16 p,
			core::map<v3s16, MapBlock*> &changed_blocks){ return NULL; }

	// Returns InvalidPositionException if not found
	MapBlock * getBlockNoCreate(v3s16 p);
	// Returns NULL if not found
	MapBlock * getBlockNoCreateNoEx(v3s16 p);
	// Gets an existing block or creates an empty one
	//MapBlock * getBlockCreate(v3s16 p);
	
	// Returns InvalidPositionException if not found
	bool isNodeUnderground(v3s16 p);
	
	// virtual from NodeContainer
	bool isValidPosition(v3s16 p)
	{
		v3s16 blockpos = getNodeBlockPos(p);
		MapBlock *blockref;
		try{
			blockref = getBlockNoCreate(blockpos);
		}
		catch(InvalidPositionException &e)
		{
			return false;
		}
		return true;
		/*v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
		bool is_valid = blockref->isValidPosition(relpos);
		return is_valid;*/
	}
	
	// virtual from NodeContainer
	// throws InvalidPositionException if not found
	MapNode getNode(v3s16 p)
	{
		v3s16 blockpos = getNodeBlockPos(p);
		MapBlock * blockref = getBlockNoCreate(blockpos);
		v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;

		return blockref->getNodeNoCheck(relpos);
	}

	// virtual from NodeContainer
	// throws InvalidPositionException if not found
	void setNode(v3s16 p, MapNode & n)
	{
		v3s16 blockpos = getNodeBlockPos(p);
		MapBlock * blockref = getBlockNoCreate(blockpos);
		v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
		blockref->setNodeNoCheck(relpos, n);
	}
	
	// Returns a CONTENT_IGNORE node if not found
	MapNode getNodeNoEx(v3s16 p)
	{
		try{
			v3s16 blockpos = getNodeBlockPos(p);
			MapBlock * blockref = getBlockNoCreate(blockpos);
			v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;

			return blockref->getNodeNoCheck(relpos);
		}
		catch(InvalidPositionException &e)
		{
			return MapNode(CONTENT_IGNORE);
		}
	}

	void unspreadLight(enum LightBank bank,
			core::map<v3s16, u8> & from_nodes,
			core::map<v3s16, bool> & light_sources,
			core::map<v3s16, MapBlock*> & modified_blocks);

	void unLightNeighbors(enum LightBank bank,
			v3s16 pos, u8 lightwas,
			core::map<v3s16, bool> & light_sources,
			core::map<v3s16, MapBlock*> & modified_blocks);
	
	void spreadLight(enum LightBank bank,
			core::map<v3s16, bool> & from_nodes,
			core::map<v3s16, MapBlock*> & modified_blocks);
	
	void lightNeighbors(enum LightBank bank,
			v3s16 pos,
			core::map<v3s16, MapBlock*> & modified_blocks);

	v3s16 getBrightestNeighbour(enum LightBank bank, v3s16 p);

	s16 propagateSunlight(v3s16 start,
			core::map<v3s16, MapBlock*> & modified_blocks);
	
	void updateLighting(enum LightBank bank,
			core::map<v3s16, MapBlock*>  & a_blocks,
			core::map<v3s16, MapBlock*> & modified_blocks);
			
	void updateLighting(core::map<v3s16, MapBlock*>  & a_blocks,
			core::map<v3s16, MapBlock*> & modified_blocks);
			
	/*
		These handle lighting but not faces.
	*/
	void addNodeAndUpdate(v3s16 p, MapNode n,
			core::map<v3s16, MapBlock*> &modified_blocks);
	void removeNodeAndUpdate(v3s16 p,
			core::map<v3s16, MapBlock*> &modified_blocks);

	/*
		Wrappers for the latter ones.
		These emit events.
		Return true if succeeded, false if not.
	*/
	bool addNodeWithEvent(v3s16 p, MapNode n);
	bool removeNodeWithEvent(v3s16 p);
	
	/*
		Takes the blocks at the edges into account
	*/
	bool dayNightDiffed(v3s16 blockpos);

	//core::aabbox3d<s16> getDisplayedBlockArea();

	//bool updateChangedVisibleArea();
	
	virtual void save(bool only_changed){assert(0);};

	/*
		Updates usage timers
	*/
	void timerUpdate(float dtime);
	
	// Takes cache into account
	// sector mutex should be locked when calling
	void deleteSectors(core::list<v2s16> &list, bool only_blocks);
	
	// Returns count of deleted sectors
	u32 deleteUnusedSectors(float timeout, bool only_blocks=false,
			core::list<v3s16> *deleted_blocks=NULL);

	// For debug printing
	virtual void PrintInfo(std::ostream &out);
	
	void transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks);

	/*
		Node metadata
		These are basically coordinate wrappers to MapBlock
	*/
	
	NodeMetadata* getNodeMetadata(v3s16 p);
	void setNodeMetadata(v3s16 p, NodeMetadata *meta);
	void removeNodeMetadata(v3s16 p);
	void nodeMetadataStep(float dtime,
			core::map<v3s16, MapBlock*> &changed_blocks);

	/*
		Variables
	*/
	
protected:

	std::ostream &m_dout;

	core::map<MapEventReceiver*, bool> m_event_receivers;
	
	// Mutex is important because on client map is accessed asynchronously
	core::map<v2s16, MapSector*> m_sectors;
	JMutex m_sector_mutex;

	// Be sure to set this to NULL when the cached sector is deleted 
	MapSector *m_sector_cache;
	v2s16 m_sector_cache_p;

	//WrapperHeightmap m_hwrapper;
	
	// Queued transforming water nodes
	UniqueQueue<v3s16> m_transforming_liquid;
};

/*
	ServerMap

	This is the only map class that is able to generate map.
*/

struct ChunkMakeData;

class ServerMap : public Map
{
public:
	/*
		savedir: directory to which map data should be saved
	*/
	ServerMap(std::string savedir);
	~ServerMap();

	s32 mapType() const
	{
		return MAPTYPE_SERVER;
	}

	/*
		Map generation
	*/
	
	// Returns the position of the chunk where the sector is in
	v2s16 sector_to_chunk(v2s16 sectorpos)
	{
		if(m_chunksize == 0)
			return v2s16(0,0);
		sectorpos.X += m_chunksize / 2;
		sectorpos.Y += m_chunksize / 2;
		v2s16 chunkpos = getContainerPos(sectorpos, m_chunksize);
		return chunkpos;
	}
	
	// Returns the position of the (0,0) sector of the chunk
	v2s16 chunk_to_sector(v2s16 chunkpos)
	{
		if(m_chunksize == 0)
			return v2s16(0,0);
		v2s16 sectorpos(
			chunkpos.X * m_chunksize,
			chunkpos.Y * m_chunksize
		);
		sectorpos.X -= m_chunksize / 2;
		sectorpos.Y -= m_chunksize / 2;
		return sectorpos;
	}

	/*
		Get a chunk.
	*/
	MapChunk *getChunk(v2s16 chunkpos)
	{
		core::map<v2s16, MapChunk*>::Node *n;
		n = m_chunks.find(chunkpos);
		if(n == NULL)
			return NULL;
		return n->getValue();
	}

	/*
		True if the chunk and its neighbors are fully generated.
		It means the chunk will not be touched in the future by the
		generator. If false, generateChunk will make it true.
	*/
	bool chunkNonVolatile(v2s16 chunkpos)
	{
		if(m_chunksize == 0)
			return true;
		
		/*for(s16 x=-1; x<=1; x++)
		for(s16 y=-1; y<=1; y++)*/
		s16 x=0;
		s16 y=0;
		{
			v2s16 chunkpos0 = chunkpos + v2s16(x,y);
			MapChunk *chunk = getChunk(chunkpos);
			if(chunk == NULL)
				return false;
			if(chunk->getGenLevel() != GENERATED_FULLY)
				return false;
		}