package logging

import (
	"bytes"
	"reflect"
	"strings"
	"testing"
)

func TestMissingTranslations(t *testing.T) {
	missing := map[string][]string{
		"fr-FR": {"mail.second", "mail.first"},
		"en-US": nil,
		"de-DE": {"mail.first"},
	}
	want := "Missing translation keys:\n" +
		"Language  Fallback  Key\n" +
		"de-DE     en-US     mail.first\n" +
		"fr-FR     en-US     mail.first\n" +
		"                    mail.second"
	message := missingTranslations(missing)
	if message != want {
		t.Fatalf("got %q, want %q", message, want)
	}
	if !reflect.DeepEqual(missing["fr-FR"], []string{"mail.second", "mail.first"}) {
		t.Fatal("report mutated input keys")
	}
	var output bytes.Buffer
	write(&output, true, "W", "Locale", message)
	for _, line := range strings.Split(strings.TrimSuffix(output.String(), "\n"), "\n") {
		if !strings.HasPrefix(line, "\033[33m[W]\033[0m [Locale] ") {
			t.Fatalf("missing warning prefix: %q", line)
		}
	}
	if missingTranslations(nil) != "" || missingTranslations(map[string][]string{"en-US": nil}) != "" {
		t.Fatal("empty report produced a warning")
	}
}