/*
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.
*/

#ifndef MAPGENV6_HEADER
#define MAPGENV6_HEADER

#include "mapgen.h"

#define AVERAGE_MUD_AMOUNT 4
#define VMANIP_FLAG_CAVE VOXELFLAG_CHECKED1

enum BiomeType
{
	BT_NORMAL,
	BT_DESERT
};

extern NoiseParams nparams_v6_def_terrain_base;
extern NoiseParams nparams_v6_def_terrain_higher;
extern NoiseParams nparams_v6_def_steepness;
extern NoiseParams nparams_v6_def_height_select;
extern NoiseParams nparams_v6_def_mud;
extern NoiseParams nparams_v6_def_beach;
extern NoiseParams nparams_v6_def_biome;
extern NoiseParams nparams_v6_def_cave;
extern NoiseParams nparams_v6_def_humidity;
extern NoiseParams nparams_v6_def_trees;
extern NoiseParams nparams_v6_def_apple_trees;

struct Cave {
	s16 min_tunnel_diameter;
	s16 max_tunnel_diameter;
	int dswitchint;
	u16 tunnel_routepoints;
	int part_max_length_rs;
	bool large_cave_is_flat;
	bool flooded;
};

struct MapgenV6Params : public MapgenParams {
	float freq_desert;
	float freq_beach;
	NoiseParams *np_terrain_base;
	NoiseParams *np_terrain_higher;
	NoiseParams *np_steepness;
	NoiseParams *np_height_select;
	NoiseParams *np_mud;
	NoiseParams *np_beach;
	NoiseParams *np_biome;
	NoiseParams *np_cave;
	NoiseParams *np_humidity;
	NoiseParams *np_trees;
	NoiseParams *np_apple_trees;
	
	MapgenV6Params() {
		freq_desert       = 0.45;
		freq_beach        = 0.15;
		np_terrain_base   = &nparams_v6_def_terrain_base;
		np_terrain_higher = &nparams_v6_def_terrain_higher;
		np_steepness      = &nparams_v6_def_steepness;
		np_height_select  = &nparams_v6_def_height_select;
		np_mud            = &nparams_v6_def_mud;
		np_beach          = &nparams_v6_def_beach;
		np_biome          = &nparams_v6_def_biome;
		np_cave           = &nparams_v6_def_cave;
		np_humidity       = &nparams_v6_def_humidity;
		np_trees          = &nparams_v6_def_trees;
		np_apple_trees    = &nparams_v6_def_apple_trees;

	}
	
	bool readParams(Settings *settings);
	void writeParams(Settings *settings);
};

class MapgenV6 : public Mapgen {
public:
	EmergeManager *emerge;

	int ystride;
	v3s16 csize;
	u32 flags;

	u32 blockseed;
	v3s16 node_min;
	v3s16 node_max;
	v3s16 full_node_min;
	v3s16 full_node_max;
	v3s16 central_area_size;
	int volume_nodes;

	Noise *noise_terrain_base;
	Noise *noise_terrain_higher;
	Noise *noise_steepness;
	Noise *noise_height_select;
	Noise *noise_mud;
	Noise *noise_beach;
	Noise *noise_biome;
	NoiseParams *np_cave;
	NoiseParams *np_humidity;
	NoiseParams *np_trees;
	NoiseParams *np_apple_trees;
	float freq_desert;
	float freq_beach;
	
	content_t c_stone;
	content_t c_dirt;
	content_t c_dirt_with_grass;
	content_t c_sand;
	content_t c_water_source;
	content_t c_lava_source;
	content_t c_gravel;
	content_t c_cobble;
	content_t c_desert_sand;
	content_t c_desert_stone;

	MapgenV6(int mapgenid, MapgenV6Params *params, EmergeManager *emerge);
	~MapgenV6();
	
	void makeChunk(BlockMakeData *data);
	int getGroundLevelAtPoint(v2s16 p);

	float baseTerrainLevel(float terrain_base, float terrain_higher,
						   float steepness, float height_select);
	virtual float baseTerrainLevelFromNoise(v2s16 p);
	virtual float baseTerrainLevelFromMap(v2s16 p);
	virtual float baseTerrainLevelFromMap(int index);

	s16 find_ground_level(v2s16 p2d);
	s16 find_stone_level(v2s16 p2d);
	bool block_is_underground(u64 seed, v3s16 blockpos);
	s16 find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision);
	
	float getHumidity(v2s16 p);
	float getTreeAmount(v2s16 p);
	bool getHaveAppleTree(v2s16 p);
	float getMudAmount(v2s16 p);
	virtual float getMudAmount(int index);
	bool getHaveBeach(v2s16 p);
	bool getHaveBeach(int index);
	BiomeType getBiome(v2s16 p);
	BiomeType getBiome(int index, v2s16 p);
	
	u32 get_blockseed(u64 seed, v3s16 p);
	
	virtual void calculateNoise();
	int generateGround();
	void addMud();
	void flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos);
	void addDirtGravelBlobs();
	void growGrass();
	void placeTreesAndJungleGrass();
	virtual void defineCave(Cave &cave, PseudoRandom ps,
							v3s16 node_min, bool large_cave);
	void generateCaves(int max_stone_y);
	virtual void generateSomething() {}; //for next mapgen
};

struct MapgenFactoryV6 : public MapgenFactory {
	Mapgen *createMapgen(int mgid, MapgenParams *params, EmergeManager *emerge) {
		return new MapgenV6(mgid, (MapgenV6Params *)params, emerge);
	};
	
	MapgenParams *createMapgenParams() {
		return new MapgenV6Params();
	};
};

#endif