package calculator

import (
	"fmt"
	"testing"
)

type testData struct {
	want float64
	a    float64
	b    float64
}

func TestAdd(t *testing.T) {
	t.Parallel()

	td := []testData{
		testData{
			want: 4,
			a:    2,
			b:    2,
		},
		testData{
			want: 2,
			a:    1,
			b:    1,
		},
		testData{
			want: 3,
			a:    1,
			b:    2,
		},
		testData{
			want: 0,
			a:    -1,
			b:    1,
		},
		testData{
			want: -1.5,
			a:    -1,
			b:    -.5,
		},
	}
	for _, data := range td {
		t.Run(fmt.Sprintf("(a:%f,b:%f)->want:%f", data.a, data.b, data.want), func(t *testing.T) {
			got := Add(data.a, data.b)
			if data.want != got {
				t.Errorf("want %f, got %f", data.want, got)
			}
		})
	}
}

func TestSubtract(t *testing.T) {
	t.Parallel()
	td := []testData{
		{
			want: -2,
			a:    4,
			b:    2,
		},
		{
			want: 2,
			a:    2,
			b:    4,
		},
		{
			want: 0,
			a:    4,
			b:    4,
		},
		{
			want: 1.5,
			a:    1,
			b:    2.5,
		},
		{
			want: -1.5,
			a:    -1,
			b:    -2.5,
		},
	}
	for _, data := range td {
		t.Run(fmt.Sprintf("(a:%f,b:%f)->want:%f", data.a, data.b, data.want), func(t *testing.T) {
			got := Subtract(data.a, data.b)
			if data.want != got {
				t.Errorf("want %f, got %f", data.want, got)
			}
		})
	}
}

func TestMultiply(t *testing.T) {
	t.Parallel()

	want := 8.
	got := Multiply(2, 4)
	if want != got {
		t.Errorf("want %f, got %f", want, got)
	}
}

func TestMultiplyOverflows(t *testing.T) {
	t.Parallel()
	td := []testData{
		{
			want: 2,
			a:    1,
			b:    2,
		},
		{
			want: 8,
			a:    2,
			b:    4,
		},
		{
			want: -8,
			a:    -2,
			b:    4,
		},
		{
			want: 1.5,
			a:    0.5,
			b:    3,
		},
		{
			want: 0,
			a:    8,
			b:    0,
		},
	}
	for _, data := range td {
		t.Run(fmt.Sprintf("(a:%f,b:%f)->want:%f", data.a, data.b, data.want), func(t *testing.T) {
			got := Multiply(data.a, data.b)
			if data.want != got {
				t.Errorf("want %f, got %f", data.want, got)
			}
		})
	}
}