/*************************************************************************/
/*  biome_terrain_generator.cpp                                          */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/* the following conditions:                                             */
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/*************************************************************************/

#include "biome_terrain_generator.h"

#include "core/config/engine.h"

#include "core/math/math_funcs.h"

#include "modules/modules_enabled.gen.h"

#ifdef MODULE_VOXELMAN_ENABLED
#include "../voxelman/world/default/voxel_chunk_default.h"
#include "../voxelman/world/voxel_chunk.h"
#endif

#include "../entity_spell_system/singletons/ess.h"
#include "../entity_spell_system/spawners/ess_entity_spawner.h"
#include "../opensimplex/open_simplex_noise.h"

int BiomeTerrainGenerator::get_current_seed() {
	return _current_seed;
}
void BiomeTerrainGenerator::set_current_seed(int value) {
	_current_seed = value;
}

#ifdef MODULE_VOXELMAN_ENABLED
void BiomeTerrainGenerator::generate_simple_terrarin(Ref<VoxelChunk> chunk, bool spawn_mobs) {
	Ref<OpenSimplexNoise> noise;
	noise.instance();
	noise->set_seed(10 * get_current_seed());
	noise->set_octaves(4);
	noise->set_period(280.0);
	noise->set_persistence(0.8);

	Ref<OpenSimplexNoise> terr_noise;
	terr_noise.instance();
	terr_noise->set_seed(10 * 321 + 112 * get_current_seed());
	terr_noise->set_octaves(4);
	terr_noise->set_period(90.0);
	terr_noise->set_persistence(0.9);

	Ref<OpenSimplexNoise> det_noise;
	det_noise.instance();
	det_noise->set_seed(10 * 3231 + 112 * get_current_seed());
	det_noise->set_octaves(6);
	det_noise->set_period(80.0);
	det_noise->set_persistence(0.3);

	for (int x = -chunk->get_margin_start(); x < chunk->get_size_x() + chunk->get_margin_end(); ++x) {
		for (int z = -chunk->get_margin_start(); z < chunk->get_size_z() + chunk->get_margin_end(); ++z) {
			float val = noise->get_noise_2d(x + (chunk->get_position_x() * chunk->get_size_x()), z + (chunk->get_position_z() * chunk->get_size_z()));
			val *= val;
			val *= 200.0;
			val += 2.0;

			float tv = terr_noise->get_noise_2d(x + (chunk->get_position_x() * chunk->get_size_x()), z + (chunk->get_position_z() * chunk->get_size_z()));
			tv *= tv * tv * tv;
			val += tv * 2.0;

			float dval = noise->get_noise_2d(x + (chunk->get_position_x() * chunk->get_size_x()), z + (chunk->get_position_z() * chunk->get_size_z()));

			val += dval * 6.0;

			int v = (int(val));

			v -= chunk->get_position_y() * (chunk->get_size_y());

			if (v > chunk->get_size_y() + chunk->get_margin_end())
				v = chunk->get_size_y() + chunk->get_margin_end();

			for (int y = -chunk->get_margin_start(); y < v; y++) {
				Math::seed(x + (chunk->get_position_x() * chunk->get_size_x()) + z + (chunk->get_position_z() * chunk->get_size_z()) + y + (chunk->get_position_y() * chunk->get_size_y()));

				if (v < 2)
					chunk->set_voxel(1, x, y, z, VoxelChunkDefault::DEFAULT_CHANNEL_TYPE);
				else if (v == 2)
					chunk->set_voxel(3, x, y, z, VoxelChunkDefault::DEFAULT_CHANNEL_TYPE);
				else
					chunk->set_voxel(2, x, y, z, VoxelChunkDefault::DEFAULT_CHANNEL_TYPE);

				float val2 = (val - static_cast<int>(val)) * 4.0;
				val2 = static_cast<int>(val2);
				val2 /= 4.0;

				chunk->set_voxel(static_cast<int>(255.0 * val2), x, y, z, VoxelChunkDefault::DEFAULT_CHANNEL_ISOLEVEL);
			}
		}
	}

	//if (!Engine::get_singleton()->is_editor_hint() && chunk->get_position_y() == 0 && spawn_mobs) {
	//		Vector3 v = Vector3(chunk->get_position_x() * chunk->get_size_x() * chunk->get_voxel_scale() + chunk->get_size_x() / 2,
	//							(chunk->get_position_y() + 1) * chunk->get_size_y() * chunk->get_voxel_scale(),
	//							chunk->get_position_z()) *
	//					(chunk->get_size_z() * chunk->get_voxel_scale() + chunk->get_size_z() / 2);
	//
	//		ESS::get_singleton()->get_entity_spawner()->call("spawn_mob", 0, Math::rand() % 3, v);
	//	}
}
#endif

BiomeTerrainGenerator::BiomeTerrainGenerator() {
	_current_seed = 0;
}

BiomeTerrainGenerator::~BiomeTerrainGenerator() {
}

void BiomeTerrainGenerator::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_current_seed"), &BiomeTerrainGenerator::get_current_seed);
	ClassDB::bind_method(D_METHOD("set_current_seed", "value"), &BiomeTerrainGenerator::set_current_seed);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "current_seed"), "set_current_seed", "get_current_seed");

#ifdef MODULE_VOXELMAN_ENABLED
	ClassDB::bind_method(D_METHOD("generate_simple_terrarin", "chunk", "spawn_mobs"), &BiomeTerrainGenerator::generate_simple_terrarin);
#endif
}