package notifyprefs

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"gitea.perlbach24.de/scripte/nexarch/internal/auth"
)

func sessionCookie(t *testing.T, issuer *auth.TokenIssuer, userID, tenantSlug string) *http.Cookie {
	t.Helper()
	token, err := issuer.Issue(userID, tenantSlug)
	if err != nil {
		t.Fatalf("session-token ausstellen: %v", err)
	}
	return &http.Cookie{Name: auth.CookieName, Value: token}
}

// Akzeptanzkriterium 1: Benutzer setzt eigene Praeferenz per HTTP.
func TestHandlerSetAndListMine(t *testing.T) {
	prefs, _, _, cleanup := setupTest(t)
	defer cleanup()
	h := NewHandler(prefs)
	issuer := auth.NewTokenIssuer("test-secret")
	cookie := sessionCookie(t, issuer, "user-1", "acme")

	setBody, _ := json.Marshal(setPreferenceRequest{EventType: "welcome", Channel: "email", Enabled: false})
	setReq := httptest.NewRequest(http.MethodPost, "/notifications/preferences", bytes.NewReader(setBody))
	setReq.AddCookie(cookie)
	setRec := httptest.NewRecorder()
	auth.RequireAuth(issuer, h.SetPreference)(setRec, setReq)
	if setRec.Code != http.StatusOK {
		t.Fatalf("set: status = %d, body: %s", setRec.Code, setRec.Body.String())
	}

	listReq := httptest.NewRequest(http.MethodGet, "/notifications/preferences", nil)
	listReq.AddCookie(cookie)
	listRec := httptest.NewRecorder()
	auth.RequireAuth(issuer, h.ListMine)(listRec, listReq)
	if listRec.Code != http.StatusOK {
		t.Fatalf("list: status = %d, body: %s", listRec.Code, listRec.Body.String())
	}
	var out []Preference
	if err := json.Unmarshal(listRec.Body.Bytes(), &out); err != nil {
		t.Fatalf("response dekodieren: %v", err)
	}
	if len(out) != 1 || out[0].Enabled {
		t.Fatalf("erwartet genau 1 deaktivierte praeferenz, habe %+v", out)
	}
}

// Akzeptanzkriterium 1 / Pruefung 2: ListMine zeigt AUSSCHLIESSLICH die
// eigenen Praeferenzen — die UserID kommt aus dem Session-Token, nicht aus
// einem vom Client kontrollierbaren Parameter.
func TestHandlerListMine_NeverShowsOtherUsersPreferences(t *testing.T) {
	prefs, _, _, cleanup := setupTest(t)
	defer cleanup()
	h := NewHandler(prefs)
	issuer := auth.NewTokenIssuer("test-secret")

	setBody, _ := json.Marshal(setPreferenceRequest{EventType: "welcome", Channel: "email", Enabled: false})
	setReq := httptest.NewRequest(http.MethodPost, "/notifications/preferences", bytes.NewReader(setBody))
	setReq.AddCookie(sessionCookie(t, issuer, "user-1", "acme"))
	setRec := httptest.NewRecorder()
	auth.RequireAuth(issuer, h.SetPreference)(setRec, setReq)
	if setRec.Code != http.StatusOK {
		t.Fatalf("set fuer user-1: status = %d", setRec.Code)
	}

	// user-2 fragt seine eigenen Praeferenzen ab — muss leer sein.
	listReq := httptest.NewRequest(http.MethodGet, "/notifications/preferences", nil)
	listReq.AddCookie(sessionCookie(t, issuer, "user-2", "acme"))
	listRec := httptest.NewRecorder()
	auth.RequireAuth(issuer, h.ListMine)(listRec, listReq)
	if listRec.Code != http.StatusOK {
		t.Fatalf("list fuer user-2: status = %d", listRec.Code)
	}
	var out []Preference
	if err := json.Unmarshal(listRec.Body.Bytes(), &out); err != nil {
		t.Fatalf("response dekodieren: %v", err)
	}
	if len(out) != 0 {
		t.Fatalf("user-2 haette user-1s praeferenzen NICHT sehen duerfen, habe %+v", out)
	}
}

// Akzeptanzkriterium 3: Tenant-Übersicht liefert alle Benutzer des Mandanten.
func TestHandlerListTenantOverview(t *testing.T) {
	prefs, _, _, cleanup := setupTest(t)
	defer cleanup()
	h := NewHandler(prefs)
	issuer := auth.NewTokenIssuer("test-secret")

	for _, u := range []string{"user-1", "user-2"} {
		body, _ := json.Marshal(setPreferenceRequest{EventType: "welcome", Channel: "email", Enabled: false})
		req := httptest.NewRequest(http.MethodPost, "/notifications/preferences", bytes.NewReader(body))
		req.AddCookie(sessionCookie(t, issuer, u, "acme"))
		rec := httptest.NewRecorder()
		auth.RequireAuth(issuer, h.SetPreference)(rec, req)
		if rec.Code != http.StatusOK {
			t.Fatalf("set fuer %s: status = %d", u, rec.Code)
		}
	}

	req := httptest.NewRequest(http.MethodGet, "/notifications/preferences/tenant", nil)
	req.AddCookie(sessionCookie(t, issuer, "admin-1", "acme"))
	rec := httptest.NewRecorder()
	auth.RequireAuth(issuer, h.ListTenantOverview)(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("overview: status = %d, body: %s", rec.Code, rec.Body.String())
	}
	var out []Preference
	if err := json.Unmarshal(rec.Body.Bytes(), &out); err != nil {
		t.Fatalf("response dekodieren: %v", err)
	}
	if len(out) != 2 {
		t.Fatalf("erwartet 2 eintraege (beide Benutzer), habe %d", len(out))
	}
}