/*
 * Copyright (C) 2018-2020 Intel Corporation
 *
 * SPDX-License-Identifier: MIT
 *
 */

#include "shared/source/utilities/numeric.h"
#include "test.h"

#include <type_traits>

using namespace NEO;

TEST(StorageTypeTest, whenGivenNumberOfBitsThenPicksIntegerTypeThatIsLargeEnough) {
    static_assert(std::is_same<uint8_t, StorageTypeT<0>>::value, "");
    static_assert(std::is_same<uint8_t, StorageTypeT<1>>::value, "");
    static_assert(std::is_same<uint8_t, StorageTypeT<8>>::value, "");

    static_assert(std::is_same<uint16_t, StorageTypeT<9>>::value, "");
    static_assert(std::is_same<uint16_t, StorageTypeT<16>>::value, "");

    static_assert(std::is_same<uint32_t, StorageTypeT<17>>::value, "");
    static_assert(std::is_same<uint32_t, StorageTypeT<32>>::value, "");

    static_assert(std::is_same<uint64_t, StorageTypeT<33>>::value, "");
    static_assert(std::is_same<uint64_t, StorageTypeT<60>>::value, "");
    static_assert(std::is_same<uint64_t, StorageTypeT<64>>::value, "");
}

TEST(FixedU4D8, whenGetMaxRepresentableFloatingPointValueIsCalledThenProperValueIsReturned) {
    constexpr float maxU4D8 = 15.99609375f;
    static_assert(maxU4D8 == FixedU4D8::getMaxRepresentableFloat(), "");
}

TEST(FixedU4D8, whenCreatingFromTooBigFloatThenValueIsClamped) {
    constexpr float maxU4D8 = FixedU4D8::getMaxRepresentableFloat();
    FixedU4D8 u4d8Max{maxU4D8};
    FixedU4D8 u4d8MaxPlus1{maxU4D8 + 1};
    EXPECT_EQ(u4d8Max.getRawAccess(), u4d8MaxPlus1.getRawAccess());
    EXPECT_EQ(maxNBitValue(4 + 8), u4d8Max.getRawAccess()); // all 12 bits should be set
    EXPECT_EQ(maxU4D8, u4d8Max.asFloat());
}

TEST(FixedU4D8, whenCreatingFromNegativeFloatThenValueIsClamped) {
    FixedU4D8 u4d8Zero{0.0f};
    FixedU4D8 u4d8Minus1{-1.0f};
    EXPECT_EQ(u4d8Zero.getRawAccess(), u4d8Minus1.getRawAccess());
    EXPECT_EQ(0U, u4d8Zero.getRawAccess()); // all bits should be cleaned
    EXPECT_EQ(0.0f, u4d8Zero.asFloat());
}

TEST(FixedU4D8, whenCreatingFromRepresentableFloatThenCorrectValueIsPreserved) {
    constexpr float someValue = 3.5f;
    FixedU4D8 u4d8{someValue};
    EXPECT_EQ(someValue, u4d8.asFloat());
}