/*
    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>

    This file is part of Magnum.

    Magnum is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License version 3
    only, as published by the Free Software Foundation.

    Magnum 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 version 3 for more details.
*/

#include "MathTest.h"

#include "Math.h"

using namespace std;

CORRADE_TEST_MAIN(Magnum::Math::Test::MathTest)

namespace Magnum { namespace Math { namespace Test {

MathTest::MathTest() {
    addTests(&MathTest::normalize,
             &MathTest::denormalize,
             &MathTest::clamp,
             &MathTest::pow,
             &MathTest::log);
}

void MathTest::normalize() {
    /* Range for signed and unsigned */
    CORRADE_COMPARE((Math::normalize<float, char>(-128)), 0.0f);
    CORRADE_COMPARE((Math::normalize<float, char>(127)), 1.0f);
    CORRADE_COMPARE((Math::normalize<float, unsigned char>(0)), 0.0f);
    CORRADE_COMPARE((Math::normalize<float, unsigned char>(255)), 1.0f);

    /* Between */
    CORRADE_COMPARE((Math::normalize<float, short>(16384)), 0.750011f);
    CORRADE_COMPARE((Math::normalize<float, short>(-16384)), 0.250004f);

    /* Test overflow for large types */
    CORRADE_COMPARE((Math::normalize<float, int>(numeric_limits<int>::min())), 0.0f);
    CORRADE_COMPARE((Math::normalize<float, int>(numeric_limits<int>::max())), 1.0f);
    CORRADE_COMPARE((Math::normalize<float, unsigned int>(0)), 0.0f);
    CORRADE_COMPARE((Math::normalize<float, unsigned int>(numeric_limits<unsigned int>::max())), 1.0f);

    CORRADE_COMPARE((Math::normalize<double, long long>(numeric_limits<long long>::min())), 0.0);
    CORRADE_COMPARE((Math::normalize<double, long long>(numeric_limits<long long>::max())), 1.0);
    CORRADE_COMPARE((Math::normalize<double, unsigned long long>(0)), 0.0);
    CORRADE_COMPARE((Math::normalize<double, unsigned long long>(numeric_limits<unsigned long long>::max())), 1.0);
}

void MathTest::denormalize() {
    /* Range for signed and unsigned */
    CORRADE_COMPARE(Math::denormalize<char>(0.0f), -128);
    CORRADE_COMPARE(Math::denormalize<char>(1.0f), 127);
    CORRADE_COMPARE(Math::denormalize<unsigned char>(0.0f), 0);
    CORRADE_COMPARE(Math::denormalize<unsigned char>(1.0f), 255);

    /* Between */
    CORRADE_COMPARE(Math::denormalize<short>(0.33f), -11141);
    CORRADE_COMPARE(Math::denormalize<short>(0.66f), 10485);

    /* Test overflow for large types */
    CORRADE_COMPARE(Math::denormalize<int>(0.0f), numeric_limits<int>::min());
    CORRADE_COMPARE(Math::denormalize<unsigned int>(0.0f), 0);
    CORRADE_COMPARE(Math::denormalize<long long>(0.0), numeric_limits<long long>::min());
    CORRADE_COMPARE(Math::denormalize<unsigned long long>(0.0), 0);

    CORRADE_COMPARE(Math::denormalize<int>(1.0), numeric_limits<int>::max());
    CORRADE_COMPARE(Math::denormalize<unsigned int>(1.0), numeric_limits<unsigned int>::max());

    {
        CORRADE_EXPECT_FAIL("Denormalize doesn't work for large types well");
        CORRADE_COMPARE((Math::denormalize<long long, long double>(1.0)), numeric_limits<long long>::max());
        CORRADE_COMPARE((Math::denormalize<unsigned long long, long double>(1.0)), numeric_limits<unsigned long long>::max());
    }
}

void MathTest::clamp() {
    CORRADE_COMPARE(Math::clamp(0.5f, -1.0f, 5.0f), 0.5f);
    CORRADE_COMPARE(Math::clamp(-1.6f, -1.0f, 5.0f), -1.0f);
    CORRADE_COMPARE(Math::clamp(9.5f, -1.0f, 5.0f), 5.0f);
}

void MathTest::pow() {
    CORRADE_COMPARE(Math::pow<10>(2ul), 1024ul);
    CORRADE_COMPARE(Math::pow<0>(3ul), 1ul);
    CORRADE_COMPARE(Math::pow<2>(2.0f), 4.0f);
}

void MathTest::log() {
    CORRADE_COMPARE(Math::log(2, 256), 8ul);
    CORRADE_COMPARE(Math::log(256, 2), 0ul);
}

}}}