package i18n

import "testing"

func TestResolveAcceptLanguage(t *testing.T) {
	t.Parallel()
	cases := []struct {
		in   string
		want string
	}{
		{"", Default},
		{"en", "en"},
		{"nl-NL,nl;q=0.9,en;q=0.8", "nl"},
		{"fr-CA,en;q=0.5", "fr"},
		{"xx-YY,en;q=0.1", "en"},
		{"de;q=0.2,pl;q=0.9", "pl"},
		{"*;q=0.1", "en"},
	}
	for _, tc := range cases {
		if got := Resolve(tc.in); got != tc.want {
			t.Fatalf("Resolve(%q)=%q want %q", tc.in, got, tc.want)
		}
	}
}

func TestTFallsBackAndSkipsStableCodes(t *testing.T) {
	t.Parallel()
	if got := T("nl", "unauthorized"); got != "niet geautoriseerd" {
		t.Fatalf("nl unauthorized=%q", got)
	}
	if got := T("nl", "password_not_set"); got != "password_not_set" {
		t.Fatalf("stable code translated: %q", got)
	}
	if got := T("nl", "some unknown message"); got != "some unknown message" {
		t.Fatalf("missing key should stay English: %q", got)
	}
	if got := T("en", "unauthorized"); got != "unauthorized" {
		t.Fatalf("en identity=%q", got)
	}
}

func TestSupportedMatchesUILocales(t *testing.T) {
	t.Parallel()
	want := []string{"en", "es", "fr", "de", "it", "pt", "nl", "pl", "ja"}
	if len(Supported) != len(want) {
		t.Fatalf("Supported len=%d want %d", len(Supported), len(want))
	}
	for i, code := range want {
		if Supported[i] != code {
			t.Fatalf("Supported[%d]=%q want %q", i, Supported[i], code)
		}
		if !IsSupported(code) {
			t.Fatalf("IsSupported(%q)=false", code)
		}
	}
	if IsSupported("xx") {
		t.Fatal("xx must not be supported")
	}
}