#include "quadraticEquation.hpp"
#include "gtest/gtest.h"

// #define f(a,b,c) std::pair<unsgined, std::pair<float,float>>(a, std::pair<float,float>(b, c))
// https://github.com/google/googletest/blob/master/googletest/docs/advanced.md <- here you can find how to properly handle floating point numbers in EXPECTs and ASSERTs

class QuadraticEquationTest : public ::testing::Test
{
    protected:
    QuadraticEquationTest() {};
    ~QuadraticEquationTest() override {};

    void SetUp() override {};
    void TearDown() override {};
};

TEST_F(QuadraticEquationTest, FirstOfTwoZeroes)
{
    auto x = utils::quadraticEquation(1, 3, 2);
    ASSERT_FLOAT_EQ(-2, x.second.first);
}

TEST_F(QuadraticEquationTest, SecondOfTwoZeroes)
{
    auto x = utils::quadraticEquation(1, 3, 2);
    ASSERT_FLOAT_EQ(-1, x.second.second);
}

TEST_F(QuadraticEquationTest, DeltaLTZero)
{
    auto x = utils::quadraticEquation(15, 10, 2);
    ASSERT_EQ(0u, x.first);
}

TEST_F(QuadraticEquationTest, DeltaEQZero)
{
    auto x = utils::quadraticEquation(1, 2, 1);
    ASSERT_EQ(1u, x.first);
}

TEST_F(QuadraticEquationTest, WhenZeroesNeedBigPrecisionAndNeedDeltaFirstArgument)
{
    auto x = utils::quadraticEquation(12, 7, -15);
    EXPECT_NEAR(-1.4471, x.second.first, 0.0001);
}

TEST_F(QuadraticEquationTest, WhenZeroesNeedBigPrecisionAndNeedDeltaSecondArgument)
{
    auto x = utils::quadraticEquation(12, 7, -15);
    ASSERT_NEAR(0.86379, x.second.second, 0.0001);
}