package math

import (
	"testing"
)

func TestAbs(t *testing.T) {
	assertEqual(t, 0, Abs(0))
	assertEqual(t, 1, Abs(1))
	assertEqual(t, 2, Abs(-2))

	assertEqual(t, 0.0, Abs(0.0))
	assertEqual(t, 1.5, Abs(1.5))
	assertEqual(t, 2.75, Abs(-2.75))
}

func TestRoundPositive(t *testing.T) {
	posf64 := float64(0.987654321)
	posf64 = Round(posf64, 2)
	assertEqual(t, float64(0.99), posf64)

	posf32 := float32(0.987654321)
	posf32 = Round(posf32, 5)
	assertEqual(t, float32(0.98765), posf32)

	negf64 := float64(-0.987654321)
	negf64 = Round(negf64, 2)
	assertEqual(t, float64(-0.99), negf64)

	negf32 := float32(-0.987654321)
	negf32 = Round(negf32, 5)
	assertEqual(t, float32(-0.98765), negf32)
}

func TestRoundInt(t *testing.T) {
	i := RoundInt(float64(0.5))
	assertEqual(t, 1, i)

	i = RoundInt(float32(1.4999999))
	assertEqual(t, 1, i)
}

func assertEqual[T comparable](t testing.TB, want, got T) {
	if want != got {
		t.Fatalf("want %v but got %v", want, got)
	}
}