package converter

import (
	"strings"
	"testing"
)

func TestConvert(t *testing.T) {
	result, err := Convert("50aa", "km")
	if err == nil {
		t.Log("should be error")
		t.Fail()
	}

	result, err = Convert("aami", "km")
	if err == nil {
		t.Log("should be error")
		t.Fail()
	}

	result, err = Convert("50mi", "aa")
	if err == nil {
		t.Log("should be error")
		t.Fail()
	}

	result, err = Convert("50mi", "km")
	if err != nil {
		t.Log("error should be nil")
		t.Fail()
	}
	if !strings.HasSuffix(result, "km") {
		t.Log("wrong unit")
		t.Fail()
	}

	convTests := []struct{ input, unit1, unit2 string }{
		{"50.00", "mi", "km"},
		{"50.00", "ft", "m"},
	}

	for _, c := range convTests {
		input := c.input + c.unit1
		conv1, err := Convert(input, c.unit2)
		if err != nil {
			t.Log("error should be nil")
			t.Fail()
		}
		conv2, err := Convert(conv1, c.unit1)
		if err != nil {
			t.Log("error should be nil")
			t.Fail()
		}
		if input != conv2 {
			t.Log("Conversion error", input, conv2)
			t.Fail()
		}

	}
}

func BenchmarkConvert(b *testing.B) {
	for i := 0; i < b.N; i++ {
		Convert("50.0mi", "km")
	}
}