/*
Minetest
Copyright (C) 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.
*/

#ifndef MAPSECTOR_HEADER
#define MAPSECTOR_HEADER

#include "irrlichttypes.h"
#include "irr_v2d.h"
#include "mapblock.h"
#include <ostream>
#include <map>
#include <vector>

class Map;
class IGameDef;

/*
	This is an Y-wise stack of MapBlocks.
*/

#define MAPSECTOR_SERVER 0
#define MAPSECTOR_CLIENT 1

class MapSector
{
public:

	MapSector(Map *parent, v2s16 pos, IGameDef *gamedef);
	virtual ~MapSector();

	virtual u32 getId() const = 0;

	void deleteBlocks();

	v2s16 getPos()
	{
		return m_pos;
	}

	MapBlock * getBlockNoCreateNoEx(s16 y);
	MapBlock * createBlankBlockNoInsert(s16 y);
	MapBlock * createBlankBlock(s16 y);

	void insertBlock(MapBlock *block);

	void deleteBlock(MapBlock *block);

	void getBlocks(MapBlockVect &dest);

	bool empty() const { return m_blocks.empty(); }

	// Always false at the moment, because sector contains no metadata.
	bool differs_from_disk;

protected:

	// The pile of MapBlocks
	UNORDERED_MAP<s16, MapBlock*> m_blocks;

	Map *m_parent;
	// Position on parent (in MapBlock widths)
	v2s16 m_pos;

	IGameDef *m_gamedef;

	// Last-used block is cached here for quicker access.
	// Be sure to set this to NULL when the cached block is deleted
	MapBlock *m_block_cache;
	s16 m_block_cache_y;

	/*
		Private methods
	*/
	MapBlock *getBlockBuffered(s16 y);

};

class ServerMapSector : public MapSector
{
public:
	ServerMapSector(Map *parent, v2s16 pos, IGameDef *gamedef);
	~ServerMapSector();

	u32 getId() const
	{
		return MAPSECTOR_SERVER;
	}

	/*
		These functions handle metadata.
		They do not handle blocks.
	*/

	void serialize(std::ostream &os, u8 version);

	static ServerMapSector* deSerialize(
			std::istream &is,
			Map *parent,
			v2s16 p2d,
			std::map<v2s16, MapSector*> & sectors,
			IGameDef *gamedef
		);

private:
};

#ifndef SERVER
class ClientMapSector : public MapSector
{
public:
	ClientMapSector(Map *parent, v2s16 pos, IGameDef *gamedef);
	~ClientMapSector();

	u32 getId() const
	{
		return MAPSECTOR_CLIENT;
	}

private:
};
#endif

#endif

