package router

import (
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"gitea.mynodes.xyz/ilker/llmgw/internal/web"
)

// The switcher is at the foot of the sign-in page, so it has to work for
// somebody with neither a key nor a session — and the choice has to stick.
func TestTheLanguageSwitchNeedsNoKeyAndSticks(t *testing.T) {
	rt, _ := chatRouter(t, "http://127.0.0.1:1")
	h := rt.Handler()

	r := httptest.NewRequest(http.MethodGet, "http://gw.example/_lang/tr", nil)
	r.Header.Set("Referer", "http://gw.example/login")
	w := httptest.NewRecorder()
	h.ServeHTTP(w, r)
	if w.Code != http.StatusSeeOther || w.Header().Get("Location") != "/login" {
		t.Fatalf("%d to %q: %s", w.Code, w.Header().Get("Location"), w.Body.String())
	}
	cookies := w.Result().Cookies()
	if len(cookies) == 0 {
		t.Fatal("no cookie remembers the choice")
	}

	r = httptest.NewRequest(http.MethodGet, "http://gw.example/login", nil)
	for _, c := range cookies {
		r.AddCookie(c)
	}
	w = httptest.NewRecorder()
	h.ServeHTTP(w, r)
	if !strings.Contains(w.Body.String(), `<html lang="tr">`) {
		t.Errorf("the sign-in page after choosing Turkish: %d %.300s", w.Code, w.Body.String())
	}
}

func TestAServerSetToTurkishGreetsVisitorsInTurkish(t *testing.T) {
	t.Cleanup(func() { _ = web.SetDefaultLanguage("") })
	cfg := baseConfig()
	cfg.Landing.Language = "tr"
	rt := newTestRouter(t, cfg)

	w := httptest.NewRecorder()
	rt.Handler().ServeHTTP(w, httptest.NewRequest(http.MethodGet, "/", nil))
	if !strings.Contains(w.Body.String(), `<html lang="tr">`) {
		t.Errorf("the landing page with no language asked for: %.300s", w.Body.String())
	}

	// A browser that asks for English still gets it.
	r := httptest.NewRequest(http.MethodGet, "/", nil)
	r.Header.Set("Accept-Language", "en-GB,en;q=0.9")
	w = httptest.NewRecorder()
	rt.Handler().ServeHTTP(w, r)
	if !strings.Contains(w.Body.String(), `<html lang="en">`) {
		t.Errorf("the landing page asked for in English: %.300s", w.Body.String())
	}
}

func TestALanguageThePortalDoesNotSpeakStopsTheServer(t *testing.T) {
	t.Cleanup(func() { _ = web.SetDefaultLanguage("") })
	cfg := baseConfig()
	cfg.Landing.Language = "klingon"
	if _, err := New(cfg, slog.New(slog.DiscardHandler)); err == nil || !strings.Contains(err.Error(), "landing.language") {
		t.Errorf("got %v, want an error naming landing.language", err)
	}
}