#include "../math/math.h"
#include "../tests/testutils.h"

#include <cppunit/TestFixture.h>
#include <cppunit/extensions/HelperMacros.h>

using namespace std;
using namespace MathUtilities;
using namespace TestUtilities::Literals;

using namespace CPPUNIT_NS;

namespace MathUtilities {

static_assert(min(1, 2, 3) == 1, "min");
static_assert(min(3, 2, 1) == 1, "min");
static_assert(min(3, 4, 2, 1) == 1, "min");
static_assert(min(3, 4, -2, 2, 1) == -2, "min");
static_assert(max(1, 2, 3) == 3, "max");
static_assert(max(3, 2, 1) == 3, "max");
static_assert(max(3, 4, 2, 1) == 4, "max");
static_assert(max(3, -2, 4, 2, 1) == 4, "max");

} // namespace MathUtilities

/*!
 * \brief The MathTests class tests functions of the MathUtilities namespace.
 */
class MathTests : public TestFixture {
    CPPUNIT_TEST_SUITE(MathTests);
    CPPUNIT_TEST(testDigitsum);
    CPPUNIT_TEST(testFactorial);
    CPPUNIT_TEST(testPowerModulo);
    CPPUNIT_TEST(testInverseModulo);
    CPPUNIT_TEST(testOrderModulo);
    CPPUNIT_TEST_SUITE_END();

public:
    void setUp()
    {
    }
    void tearDown()
    {
    }

    void testDigitsum();
    void testFactorial();
    void testPowerModulo();
    void testInverseModulo();
    void testOrderModulo();
};

CPPUNIT_TEST_SUITE_REGISTRATION(MathTests);

void MathTests::testDigitsum()
{
    CPPUNIT_ASSERT_EQUAL(0, digitsum(0));
    CPPUNIT_ASSERT_EQUAL(7, digitsum(16));
    CPPUNIT_ASSERT_EQUAL(1, digitsum(16, 16));
}

void MathTests::testFactorial()
{
    CPPUNIT_ASSERT_EQUAL(6, factorial(3));
}

void MathTests::testPowerModulo()
{
    CPPUNIT_ASSERT_EQUAL(25_uint64, powerModulo(5, 2, 30));
    CPPUNIT_ASSERT_EQUAL(5_uint64, powerModulo(5, 2, 20));
}

void MathTests::testInverseModulo()
{
    CPPUNIT_ASSERT_EQUAL(-12_int64, inverseModulo(2, 25));
    CPPUNIT_ASSERT_EQUAL(-8_int64, inverseModulo(3, 25));
}

void MathTests::testOrderModulo()
{
    CPPUNIT_ASSERT_EQUAL(20_uint64, orderModulo(2, 25));
    CPPUNIT_ASSERT_EQUAL(5_uint64, orderModulo(6, 25));
    CPPUNIT_ASSERT_EQUAL(0_uint64, orderModulo(5, 25));
}