/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022, 2023 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include <limits>
#include <Corrade/TestSuite/Tester.h>

#include "Magnum/Math/Packing.h"
#include "Magnum/Math/Vector3.h"

namespace Magnum { namespace Math { namespace Test { namespace {

struct PackingTest: TestSuite::Tester {
    explicit PackingTest();

    void bitMax();

    void unpackUnsigned();
    void unpackSigned();
    void packUnsigned();
    void packSigned();
    void reunpackUnsigned();
    void reunpackSigned();
    void unpackTypeDeduction();

    void pack8bitRoundtrip();
    void pack16bitRoundtrip();

    /* Half (un)pack functions are tested and benchmarked in HalfTest.cpp,
       because there's involved comparison and benchmarks to ground truth */
};

using namespace Literals;

using Magnum::Rad;
using Magnum::Vector3;

PackingTest::PackingTest() {
    addTests({&PackingTest::bitMax,

              &PackingTest::unpackUnsigned,
              &PackingTest::unpackSigned,
              &PackingTest::packUnsigned,
              &PackingTest::packSigned,
              &PackingTest::reunpackUnsigned,
              &PackingTest::reunpackSigned,
              &PackingTest::unpackTypeDeduction});

    addRepeatedTests({&PackingTest::pack8bitRoundtrip}, 256);
    addRepeatedTests({&PackingTest::pack16bitRoundtrip}, 65536);
}

void PackingTest::bitMax() {
    CORRADE_COMPARE(Implementation::bitMax<UnsignedByte>(), 0xff);
    CORRADE_COMPARE(Implementation::bitMax<Byte>(), 0x7f);
    CORRADE_COMPARE(Implementation::bitMax<UnsignedShort>(), 0xffff);
    CORRADE_COMPARE(Implementation::bitMax<Short>(), 0x7fff);
    CORRADE_COMPARE(Implementation::bitMax<UnsignedInt>(), 0xffffffff);
    CORRADE_COMPARE(Implementation::bitMax<Int>(), 0x7fffffff);
    CORRADE_COMPARE(Implementation::bitMax<UnsignedLong>(), 0xffffffffffffffffull);
    CORRADE_COMPARE(Implementation::bitMax<Long>(), 0x7fffffffffffffffll);

    CORRADE_COMPARE((Implementation::bitMax<UnsignedShort, 14>()), 16383);
    CORRADE_COMPARE((Implementation::bitMax<UnsignedInt, 14>()), 16383);
    CORRADE_COMPARE((Implementation::bitMax<Short, 14>()), 8191);
    CORRADE_COMPARE((Implementation::bitMax<Int, 14>()), 8191);
}

void PackingTest::unpackUnsigned() {
    CORRADE_COMPARE((Math::unpack<Float, UnsignedByte>(0)), 0.0f);
    CORRADE_COMPARE((Math::unpack<Float, UnsignedByte>(149)), 0.584314f);
    CORRADE_COMPARE((Math::unpack<Float, UnsignedByte>(255)), 1.0f);

    CORRADE_COMPARE((Math::unpack<Double, UnsignedInt>(0)), 0.0);
    CORRADE_COMPARE((Math::unpack<Double, UnsignedInt>(std::numeric_limits<UnsignedInt>::max())), 1.0);

    CORRADE_COMPARE((Math::unpack<long double, UnsignedLong>(0)), 0.0);
    CORRADE_COMPARE((Math::unpack<long double, UnsignedLong>(std::numeric_limits<UnsignedLong>::max())), 1.0);

    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort>(0)), 0.0f);
    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort>(std::numeric_limits<UnsignedShort>::max())), 1.0f);

    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort>(8192)), 0.125002f);
    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort>(49152)), 0.750011f);

    /* Bits */
    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort>(8191)), 0.124987f);
    CORRADE_COMPARE((Math::unpack<Float, UnsignedShort, 14>(8191)), 0.499969f);
    CORRADE_COMPARE((Math::unpack<Float, 14>(8191u)), 0.499969f);
    CORRADE_COMPARE((Math::unpack<Float, 14>(8191)), 1.0f);

    /* Vector overloads */
    CORRADE_COMPARE(Math::unpack<Vector3>(Vector3ub(0, 127, 255)), Vector3(0.0f, 0.498039f, 1.0f));
    CORRADE_COMPARE((Math::unpack<Vector3, 6>(Vector3ub(0, 31, 63))), Vector3(0.0f, 0.492063f, 1.0f));

    /* Wrapped types */
    CORRADE_COMPARE((Math::unpack<Rad, UnsignedShort>(8191)), 0.124987_radf);
    CORRADE_COMPARE((Math::unpack<Rad, 14>(8191u)), 0.499969_radf);
}

void PackingTest::unpackSigned() {
    CORRADE_COMPARE((Math::unpack<Float, Byte>(127)), 1.0f);
    CORRADE_COMPARE((Math::unpack<Float, Byte>(37)), 0.291339f);
    CORRADE_COMPARE((Math::unpack<Float, Byte>(0)), 0.0f);
    CORRADE_COMPARE((Math::unpack<Float, Byte>(-72)), -0.566929f);
    CORRADE_COMPARE((Math::unpack<Float, Byte>(-128)), -1.0f);

    CORRADE_COMPARE((Math::unpack<Float, Short>(std::numeric_limits<Short>::min())), -1.0f);
    CORRADE_COMPARE((Math::unpack<Float, Short>(0)), 0.0f);
    CORRADE_COMPARE((Math::unpack<Float, Short>(std::numeric_limits<Short>::max())), 1.0f);

    CORRADE_COMPARE((Math::unpack<Double, Int>(std::numeric_limits<Int>::min())), -1.0);
    CORRADE_COMPARE((Math::unpack<Double, Int>(0)), 0.0);
    CORRADE_COMPARE((Math::unpack<Double, Int>(std::numeric_limits<Int>::max())), 1.0);

    CORRADE_COMPARE((Math::unpack<long double, Long>(std::numeric_limits<Long>::min())), -1.0);
    CORRADE_COMPARE((Math::unpack<long double, Long>(0)), 0.0);
    CORRADE_COMPARE((Math::unpack<long double, Long>(std::numeric_limits<Long>::max())), 1.0);

    CORRADE_COMPARE((Math::unpack<Float, Short>(16384)), 0.500015f);
    CORRADE_COMPARE((Math::unpack<Float, Short>(-16384)), -0.500015f);

    /* Bits */
    CORRADE_COMPARE((Math::unpack<Float, Short>(8191)), 0.249977f);
    CORRADE_COMPARE((Math::unpack<Float, 14>(8191)), 1.0f);

    /* Vector overloads */
    CORRADE_COMPARE(Math::unpack<Vector3>(Vector3b(0, -127, 64)), Vector3(0.0f, -1.0f, 0.503937f));
    CORRADE_COMPARE((Math::unpack<Vector3, 6>(Vector3b(0, -31, 16))), Vector3(0.0f, -1.0f, 0.516129f));

    /* Wrapped types */
    CORRADE_COMPARE((Math::unpack<Rad, Short>(8191)), 0.249977_radf);
    CORRADE_COMPARE((Math::unpack<Rad, 14>(8191)), 1.0_radf);
}

void PackingTest::packUnsigned() {
    /* Close extremes should work too */
    CORRADE_COMPARE(Math::pack<UnsignedByte>(0.0f), 0);
    CORRADE_COMPARE(Math::pack<UnsignedByte>(0.0000001f), 0);
    CORRADE_COMPARE(Math::pack<UnsignedByte>(0.4357f), 111);
    CORRADE_COMPARE(Math::pack<UnsignedByte>(0.5f), 128);
    CORRADE_COMPARE(Math::pack<UnsignedByte>(1.0f), 255);
    CORRADE_COMPARE(Math::pack<UnsignedByte>(0.9999999f), 255);

    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.0f), 0);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.000001f), 0);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.4357f), 28554);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.5f), 32768);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(1.0f), 65535);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.999999f), 65535);

    CORRADE_COMPARE(Math::pack<UnsignedInt>(0.0), 0);
    CORRADE_COMPARE(Math::pack<UnsignedInt>(1.0), std::numeric_limits<UnsignedInt>::max());

    CORRADE_COMPARE(Math::pack<UnsignedLong>(0.0l), 0);
    {
        #if defined(CORRADE_TARGET_MSVC) || (defined(CORRADE_TARGET_ANDROID) && defined(CORRADE_TARGET_32BIT) && defined(CORRADE_TARGET_X86))
        CORRADE_EXPECT_FAIL("Long double (de)normalization is broken on MSVC and 32-bit x86 Android.");
        #endif
        CORRADE_COMPARE(Math::pack<UnsignedLong>(1.0l), std::numeric_limits<UnsignedLong>::max());
    }

    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.33f), 21627);
    CORRADE_COMPARE(Math::pack<UnsignedShort>(0.66f), 43253);

    /* Bits */
    CORRADE_COMPARE((Math::pack<UnsignedShort>(0.5f)), 32768);
    CORRADE_COMPARE((Math::pack<UnsignedShort, 14>(0.5f)), 8192);

    /* Vector overloads */
    CORRADE_COMPARE(Math::pack<Vector3ub>(Vector3(0.0f, 0.5f, 1.0f)), Vector3ub(0, 128, 255));
    CORRADE_COMPARE((Math::pack<Vector3ub, 6>(Vector3(0.0f, 0.5f, 1.0f))), Vector3ub(0, 32, 63));

    /* Wrapped types */
    CORRADE_COMPARE((Math::pack<UnsignedShort>(0.5_degf)), 32768);
    CORRADE_COMPARE((Math::pack<UnsignedShort, 14>(0.5_degf)), 8192);
}

void PackingTest::packSigned() {
    CORRADE_COMPARE(Math::pack<Byte>(-1.0f), -127);
    CORRADE_COMPARE(Math::pack<Byte>(-0.732f), -93);
    CORRADE_COMPARE(Math::pack<Byte>(0.0f), 0);
    CORRADE_COMPARE(Math::pack<Byte>(0.1357f), 17);
    CORRADE_COMPARE(Math::pack<Byte>(1.0f), 127);

    CORRADE_COMPARE(Math::pack<Short>(-1.0f), std::numeric_limits<Short>::min()+1);
    CORRADE_COMPARE(Math::pack<Short>(0.0f), 0);
    CORRADE_COMPARE(Math::pack<Short>(1.0f), std::numeric_limits<Short>::max());

    CORRADE_COMPARE(Math::pack<Int>(-1.0), std::numeric_limits<Int>::min()+1);
    CORRADE_COMPARE(Math::pack<Int>(0.0), 0);
    CORRADE_COMPARE(Math::pack<Int>(1.0), std::numeric_limits<Int>::max());

    {
        #if defined(CORRADE_TARGET_MSVC) || (defined(CORRADE_TARGET_ANDROID) && defined(CORRADE_TARGET_32BIT) && defined(CORRADE_TARGET_X86))
        CORRADE_EXPECT_FAIL("Long double (de)normalization is broken on MSVC and 32-bit x86 Android.");
        #endif
        CORRADE_COMPARE(Math::pack<Long>(-1.0l), std::numeric_limits<Long>::min()+1);
    }
    CORRADE_COMPARE(Math::pack<Long>(0.0l), 0);
    {
        #if defined(CORRADE_TARGET_MSVC) || (defined(CORRADE_TARGET_ANDROID) && defined(CORRADE_TARGET_32BIT) && defined(CORRADE_TARGET_X86))
        CORRADE_EXPECT_FAIL("Long double (de)normalization is broken on MSVC and 32-bit x86 Android.");
        #endif
        CORRADE_COMPARE(Math::pack<Long>(1.0l), std::numeric_limits<Long>::max());
    }

    CORRADE_COMPARE(Math::pack<Short>(-0.33f), -10813);
    CORRADE_COMPARE(Math::pack<Short>(0.66f), 21626);

    /* Bits */
    CORRADE_COMPARE((Math::pack<Short>(-0.5f)), -16384);
    CORRADE_COMPARE((Math::pack<Short, 14>(-0.5f)), -4096);

    /* Vector overloads */
    CORRADE_COMPARE(Math::pack<Vector3b>(Vector3(0.0f, -1.0f, 0.5f)), Vector3b(0, -127, 64));
    CORRADE_COMPARE((Math::pack<Vector3b, 6>(Vector3(0.0f, -1.0f, 0.5f))), Vector3b(0, -31, 16));

    /* Wrapped types */
    CORRADE_COMPARE((Math::pack<Short>(-0.5_degf)), -16384);
    CORRADE_COMPARE((Math::pack<Short, 14>(-0.5_degf)), -4096);
}

void PackingTest::reunpackUnsigned() {
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<UnsignedByte>(0.0f)), 0.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<UnsignedByte>(1.0f)), 1.0f);

    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<UnsignedShort>(0.0f)), 0.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<UnsignedShort>(1.0f)), 1.0f);

    CORRADE_COMPARE(Math::unpack<Double>(Math::pack<UnsignedInt>(0.0)), 0.0);
    CORRADE_COMPARE(Math::unpack<Double>(Math::pack<UnsignedInt>(1.0)), 1.0);

    CORRADE_COMPARE(Math::unpack<long double>(Math::pack<UnsignedLong>(0.0l)), 0.0l);
    {
        #if defined(CORRADE_TARGET_MSVC) || (defined(CORRADE_TARGET_ANDROID) && defined(CORRADE_TARGET_32BIT) && defined(CORRADE_TARGET_X86))
        CORRADE_EXPECT_FAIL("Long double (de)normalization is broken on MSVC and 32-bit x86 Android.");
        #endif
        CORRADE_COMPARE(Math::unpack<long double>(Math::pack<UnsignedLong>(1.0l)), 1.0l);
    }
}

void PackingTest::reunpackSigned() {
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Byte>(-1.0f)), -1.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Byte>(0.0f)), 0.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Byte>(1.0f)), 1.0f);

    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Short>(-1.0f)), -1.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Short>(0.0f)), 0.0f);
    CORRADE_COMPARE(Math::unpack<Float>(Math::pack<Short>(1.0f)), 1.0f);

    CORRADE_COMPARE(Math::unpack<Double>(Math::pack<Int>(-1.0)), -1.0);
    CORRADE_COMPARE(Math::unpack<Double>(Math::pack<Int>(0.0)), 0.0);
    CORRADE_COMPARE(Math::unpack<Double>(Math::pack<Int>(1.0)), 1.0);

    CORRADE_COMPARE(Math::unpack<long double>(Math::pack<Long>(-1.0l)), -1.0l);
    CORRADE_COMPARE(Math::unpack<long double>(Math::pack<Long>(0.0l)), 0.0l);
    {
        #if defined(CORRADE_TARGET_MSVC) || (defined(CORRADE_TARGET_ANDROID) && defined(CORRADE_TARGET_32BIT))
        CORRADE_EXPECT_FAIL("Long double (de)normalization is broken on MSVC and 32-bit Android.");
        #endif
        CORRADE_COMPARE(Math::unpack<long double>(Math::pack<Long>(1.0l)), 1.0l);
    }
}

void PackingTest::unpackTypeDeduction() {
    if(std::is_signed<char>::value)
        CORRADE_COMPARE(Math::unpack<Float>('\x7F'), 1.0f);
    else {
        CORRADE_INFO("char is unsigned");
        /* Raspberry Pi `char` is unsigned (huh) */
        CORRADE_VERIFY(std::is_unsigned<char>::value);
        CORRADE_COMPARE(Math::unpack<Float>('\x7F'), 0.498039f);
    }
    CORRADE_COMPARE((Math::unpack<Float, Byte>('\x7F')), 1.0f);
}

void PackingTest::pack8bitRoundtrip() {
    CORRADE_COMPARE(Math::pack<UnsignedByte>(Math::unpack<Float, UnsignedByte>(testCaseRepeatId())), testCaseRepeatId());
}

void PackingTest::pack16bitRoundtrip() {
    CORRADE_COMPARE(Math::pack<UnsignedShort>(Math::unpack<Float, UnsignedShort>(testCaseRepeatId())), testCaseRepeatId());
}

}}}}

CORRADE_TEST_MAIN(Magnum::Math::Test::PackingTest)