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/*
Minetest
Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.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.
*/

#include "test.h"

#include <cmath>
#include "exceptions.h"
#include "noise.h"

class TestNoise : public TestBase {
public:
	TestNoise() { TestManager::registerTestModule(this); }
	const char *getName() { return "TestNoise"; }

	void runTests(IGameDef *gamedef);

	void testNoise2dAtOriginWithZeroSeed();
	void testNoise2dWithMaxSeed();
	void testNoise2dWithFunPrimes();
	void testNoise2dPoint();
	void testNoise2dBulk();
	void testNoise3dAtOriginWithZeroSeed();
	void testNoise3dWithMaxSeed();
	void testNoise3dWithFunPrimes();
	void testNoise3dPoint();
	void testNoise3dBulk();
	void testNoiseInvalidParams();

	static const float expected_2d_results[10 * 10];
	static const float expected_3d_results[10 * 10 * 10];
};

static TestNoise g_test_instance;

void TestNoise::runTests(IGameDef *gamedef)
{
	TEST(testNoise2dAtOriginWithZeroSeed);
	TEST(testNoise2dWithMaxSeed);
	TEST(testNoise2dWithFunPrimes);
	TEST(testNoise2dPoint);
	TEST(testNoise2dBulk);
	TEST(testNoise3dAtOriginWithZeroSeed);
	TEST(testNoise3dWithMaxSeed);
	TEST(testNoise3dWithFunPrimes);
	TEST(testNoise3dPoint);
	TEST(testNoise3dBulk);
	TEST(testNoiseInvalidParams);
}

////////////////////////////////////////////////////////////////////////////////

void TestNoise::testNoise2dAtOriginWithZeroSeed()
{
	float actual{ noise2d(0, 0, 0) };
	constexpr float expected{ -0.281791f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise2dWithMaxSeed()
{
	float actual{ noise2d(4096, 4096, 2147483647) };
	constexpr float expected{ 0.950606f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise2dWithFunPrimes()
{
	float actual{ noise2d(-3947, -2333, 7027) };
	constexpr float expected{ -0.294907f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise2dPoint()
{
	NoiseParams np_normal(20, 40, v3f(50, 50, 50), 9,  5, 0.6, 2.0);

	u32 i = 0;
	for (u32 y = 0; y != 10; y++)
	for (u32 x = 0; x != 10; x++, i++) {
		float actual   = NoisePerlin2D(&np_normal, x, y, 1337);
		float expected = expected_2d_results[i];
		UASSERT(std::fabs(actual - expected) <= 0.00001);
	}
}

void TestNoise::testNoise2dBulk()
{
	NoiseParams np_normal(20, 40, v3f(50, 50, 50), 9,  5, 0.6, 2.0);
	Noise noise_normal_2d(&np_normal, 1337, 10, 10);
	float *noisevals = noise_normal_2d.perlinMap2D(0, 0, NULL);

	for (u32 i = 0; i != 10 * 10; i++) {
		float actual   = noisevals[i];
		float expected = expected_2d_results[i];
		UASSERT(std::fabs(actual - expected) <= 0.00001);
	}
}

void TestNoise::testNoise3dAtOriginWithZeroSeed()
{
	float actual{ noise2d(0, 0, 0) };
	constexpr float expected{ -0.281791f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise3dWithMaxSeed()
{
	float actual{ noise3d(4096, 4096, 4096, 2147483647) };
	constexpr float expected{ -0.775243f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise3dWithFunPrimes()
{
	float actual{ noise2d(3903, -1723, 7411) };
	constexpr float expected{ 0.989124f };
	UASSERT(std::fabs(actual - expected) <= 0.00001);
}

void TestNoise::testNoise3dPoint()
{
	NoiseParams np_normal(20, 40, v3f(50, 50, 50), 9,  5, 0.6, 2.0);

	u32 i = 0;
	for (u32 z = 0; z != 10; z++)
	for (u32 y = 0; y != 10; y++)
	for (u32 x = 0; x != 10; x++, i++) {
		float actual   = NoisePerlin3D(&np_normal, x, y, z, 1337);
		float expected = expected_3d_results[i];
		UASSERT(std::fabs(actual - expected) <= 0.00001);
	}
}

void TestNoise::testNoise3dBulk()
{
	NoiseParams np_normal(20, 40, v3f(50, 50, 50), 9, 5, 0.6, 2.0);
	Noise noise_normal_3d(&np_normal, 1337, 10, 10, 10);
	float *noisevals = noise_normal_3d.perlinMap3D(0, 0, 0, NULL);

	for (u32 i = 0; i != 10 * 10 * 10; i++) {
		float actual   = noisevals[i];
		float expected = expected_3d_results[i];
		UASSERT(std::fabs(actual - expected) <= 0.00001);
	}
}

void TestNoise::testNoiseInvalidParams()
{
	bool exception_thrown = false;

	try {
		NoiseParams np_highmem(4, 70, v3f(1, 1, 1), 5, 60, 0.7, 10.0);
		Noise noise_highmem_3d(&np_highmem, 1337, 200, 200, 200);
		noise_highmem_3d.perlinMap3D(0, 0, 0, NULL);
	} catch (InvalidNoiseParamsException &) {
		exception_thrown = true;
	}

	UASSERT(exception_thrown);
}

const float TestNoise::expected_2d_results[10 * 10] = {
	19.11726, 18.49626, 16.48476, 15.02135, 14.75713, 16.26008, 17.54822,
	18.06860, 18.57016, 18.48407, 18.49649, 17.89160, 15.94162, 14.54901,
	14.31298, 15.72643, 16.94669, 17.55494, 18.58796, 18.87925, 16.08101,
	15.53764, 13.83844, 12.77139, 12.73648, 13.95632, 14.97904, 15.81829,
	18.37694, 19.73759, 13.19182, 12.71924, 11.34560, 10.78025, 11.18980,
	12.52303, 13.45012, 14.30001, 17.43298, 19.15244, 10.93217, 10.48625,
	 9.30923,  9.18632, 10.16251, 12.11264, 13.19697, 13.80801, 16.39567,
	17.66203, 10.40222,  9.86070,  8.47223,  8.45471, 10.04780, 13.54730,
	15.33709, 15.48503, 16.46177, 16.52508, 10.80333, 10.19045,  8.59420,
	 8.47646, 10.22676, 14.43173, 16.48353, 16.24859, 16.20863, 15.52847,
	11.01179, 10.45209,  8.98678,  8.83986, 10.43004, 14.46054, 16.29387,
	15.73521, 15.01744, 13.85542, 10.55201, 10.33375,  9.85102, 10.07821,
	11.58235, 15.62046, 17.35505, 16.13181, 12.66011,  9.51853, 11.50994,
	11.54074, 11.77989, 12.29790, 13.76139, 17.81982, 19.49008, 17.79470,
	12.34344,  7.78363,
};

const float TestNoise::expected_3d_results[10 * 10 * 10] = {
	19.11726, 18.01059, 16.90392, 15.79725, 16.37154, 17.18597, 18.00040,
	18.33467, 18.50889, 18.68311, 17.85386, 16.90585, 15.95785, 15.00985,
	15.61132, 16.43415, 17.25697, 17.95415, 18.60942, 19.26471, 16.59046,
	15.80112, 15.01178, 14.22244, 14.85110, 15.68232, 16.51355, 17.57361,
	18.70996, 19.84631, 15.32705, 14.69638, 14.06571, 13.43504, 14.09087,
	14.93050, 15.77012, 17.19309, 18.81050, 20.42790, 15.06729, 14.45855,
	13.84981, 13.24107, 14.39364, 15.79782, 17.20201, 18.42640, 19.59085,
	20.75530, 14.95090, 14.34456, 13.73821, 13.13187, 14.84825, 16.89645,
	18.94465, 19.89025, 20.46832, 21.04639, 14.83452, 14.23057, 13.62662,
	13.02267, 15.30287, 17.99508, 20.68730, 21.35411, 21.34580, 21.33748,
	15.39817, 15.03590, 14.67364, 14.31137, 16.78242, 19.65824, 22.53405,
	22.54626, 21.60395, 20.66164, 16.18850, 16.14768, 16.10686, 16.06603,
	18.60362, 21.50956, 24.41549, 23.64784, 21.65566, 19.66349, 16.97884,
	17.25946, 17.54008, 17.82069, 20.42482, 23.36088, 26.29694, 24.74942,