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package ki18n
import (
"bytes"
"context"
"fmt"
"net/http"
"net/http/httptest"
"strings"
"testing"
"testing/fstest"
"time"
"github.com/a-h/templ"
"github.com/martinlehoux/kagamigo/kcore"
"github.com/stretchr/testify/assert"
)
func TestSimpleText(t *testing.T) {
initFrenchLocale(map[string]string{
"Hello you": "Bonjour toi",
})
ctx := context.WithValue(context.Background(), contextKey{}, "fr-FR")
result := render(t, Tr(ctx, "Hello you"))
assert.Equal(t, "Bonjour toi", result)
}
func TestVariables(t *testing.T) {
initFrenchLocale(map[string]string{
"Hello %s": "Bonjour %s",
})
ctx := context.WithValue(context.Background(), contextKey{}, "fr-FR")
result := render(t, Tr(ctx, "Hello %s", "John"))
assert.Equal(t, "Bonjour John", result)
}
func TestSpanClass(t *testing.T) {
initFrenchLocale(map[string]string{
"Hello <span class=\"text-bold\">%s</span>": "Bonjour <span class=\"text-bold\">%s</span>",
})
ctx := context.WithValue(context.Background(), contextKey{}, "fr-FR")
result := render(t, Tr(ctx, "Hello <span class=\"text-bold\">%s</span>", "John"))
assert.Equal(t, "Bonjour <span class=\"text-bold\">John</span>", result)
}
func TestTr_withoutLangInContext(t *testing.T) {
initFrenchLocale(map[string]string{
"Hello": "Bonjour",
})
result := render(t, Tr(context.Background(), "Hello"))
assert.Equal(t, "Hello", result)
}
func TestFormatTime_englishLocale(t *testing.T) {
ctx := context.WithValue(context.Background(), contextKey{}, "en-GB")
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 May 2026", FormatTime(ctx, d))
}
func TestFormatTime_frenchLocale(t *testing.T) {
ctx := context.WithValue(context.Background(), contextKey{}, "fr-FR")
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 mai 2026", FormatTime(ctx, d))
}
func TestFormatTime_unknownLocale(t *testing.T) {
ctx := context.WithValue(context.Background(), contextKey{}, "de-DE")
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 May 2026", FormatTime(ctx, d))
}
func TestFormatTime_extraLocale(t *testing.T) {
spanishMonths := [...]string{
"enero", "febrero", "marzo", "abril", "mayo", "junio",
"julio", "agosto", "septiembre", "octubre", "noviembre", "diciembre",
}
fs := fstest.MapFS{
"es-ES/index.yml": &fstest.MapFile{Data: []byte{}},
}
kcore.Expect(Init(fs, Locale{
Lang: "es-ES",
FormatTime: func(t time.Time) string {
return fmt.Sprintf("%d de %s de %d", t.Day(), spanishMonths[t.Month()-1], t.Year())
},
}), "failed to init fs")
ctx := context.WithValue(context.Background(), contextKey{}, "es-ES")
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 de mayo de 2026", FormatTime(ctx, d))
}
func TestFormatTime_extraLocaleNoFormatter(t *testing.T) {
fs := fstest.MapFS{
"es-ES/index.yml": &fstest.MapFile{Data: []byte{}},
}
kcore.Expect(Init(fs, Locale{Lang: "es-ES"}), "failed to init fs")
ctx := context.WithValue(context.Background(), contextKey{}, "es-ES")
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 May 2026", FormatTime(ctx, d))
}
func TestFormatTime_noLocaleInContext(t *testing.T) {
d := time.Date(2026, time.May, 12, 0, 0, 0, 0, time.UTC)
assert.Equal(t, "12 May 2026", FormatTime(context.Background(), d))
}
func TestCookieStrategy_found(t *testing.T) {
r := httptest.NewRequest(http.MethodGet, "/", nil)
r.AddCookie(&http.Cookie{Name: "lang", Value: "fr-FR"})
s := CookieStrategy("lang")
assert.Equal(t, "fr-FR", s.Detect(r))
}
func TestCookieStrategy_missing(t *testing.T) {
r := httptest.NewRequest(http.MethodGet, "/", nil)
s := CookieStrategy("lang")
assert.Equal(t, "", s.Detect(r))
}
func TestAcceptLanguageStrategy_found(t *testing.T) {
initFrenchLocale(map[string]string{})
r := httptest.NewRequest(http.MethodGet, "/", nil)
r.Header.Set("Accept-Language", "fr-FR,fr;q=0.9")
assert.Equal(t, "fr-FR", AcceptLanguageStrategy.Detect(r))
}
func TestAcceptLanguageStrategy_missing(t *testing.T) {
initFrenchLocale(map[string]string{})
r := httptest.NewRequest(http.MethodGet, "/", nil)
assert.Equal(t, "", AcceptLanguageStrategy.Detect(r))
}
func TestLangMiddleware_firstStrategyWins(t *testing.T) {
first := strategyFunc(func(_ *http.Request) string { return "fr-FR" })
second := strategyFunc(func(_ *http.Request) string { return "de-DE" })
var capturedLang string
handler := LangMiddleware(first, second)(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
capturedLang, _ = r.Context().Value(contextKey{}).(string)
}))
handler.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
assert.Equal(t, "fr-FR", capturedLang)
}
func TestLangMiddleware_fallsThrough(t *testing.T) {
first := strategyFunc(func(_ *http.Request) string { return "" })
second := strategyFunc(func(_ *http.Request) string { return "fr-FR" })
var capturedLang string
handler := LangMiddleware(first, second)(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
capturedLang, _ = r.Context().Value(contextKey{}).(string)
}))
handler.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
assert.Equal(t, "fr-FR", capturedLang)
}
func TestLangMiddleware_fallback(t *testing.T) {
first := strategyFunc(func(_ *http.Request) string { return "" })
var capturedLang string
handler := LangMiddleware(first)(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
capturedLang, _ = r.Context().Value(contextKey{}).(string)
}))
handler.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
assert.Equal(t, "en-GB", capturedLang)
}
// render is a test helper that renders a component and returns the result as a string
func render(t *testing.T, c templ.Component) string {
t.Helper()
w := &bytes.Buffer{}
err := c.Render(context.Background(), w)
assert.NoError(t, err)
return w.String()
}
// initFrenchLocale creates a filesystem with fr-FR locale from a translation map
func initFrenchLocale(translations map[string]string) {
var sb strings.Builder
for key, value := range translations {
fmt.Fprintf(&sb, "%q: %q\n", key, value)
}
fs := fstest.MapFS{
"fr-FR/index.yml": &fstest.MapFile{
Data: []byte(sb.String()),
},
}
kcore.Expect(Init(fs), "failed to init fs")
}
// strategyFunc is a test helper to create a Strategy from a plain function
type strategyFunc func(*http.Request) string
func (f strategyFunc) Detect(r *http.Request) string { return f(r) }
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