private function transformUser(?User $user): ?array
    {
        if (!$user) {
            return null;
        }

        return [
            'id' => $user->id,
            'email' => $user->email,
            'name' => trim(($user->first_name ?? '').' '.($user->last_name ?? '')) ?: $user->name,
            'pending_purchase' => (bool) $user->pending_purchase,
            'email_verified_at' => $user->email_verified_at,
        ];
    }

    /**
     * Track an abandoned checkout for reminder emails
     */
    public function trackAbandonedCheckout(Request $request): JsonResponse
    {
        $request->validate([
            'package_id' => 'required|integer|exists:packages,id',
            'last_step' => 'required|integer|min:1|max:4',
            'user_id' => 'nullable|integer|exists:users,id',
            'email' => 'nullable|email',
        ]);

        try {
            $userId = $request->user_id;
            $email = $request->email;

            // Wenn kein user_id aber email, versuche User zu finden
            if (!$userId && $email) {
                $user = User::where('email', $email)->first();
                $userId = $user?->id;
            }

            // Nur tracken wenn wir einen User haben
            if (!$userId) {
                return response()->json(['success' => false, 'message' => 'No user found to track']);
            }

            $user = User::find($userId);
            if (!$user) {
                return response()->json(['success' => false, 'message' => 'User not found']);
            }

            // Erstelle oder update abandoned checkout
            AbandonedCheckout::updateOrCreate(
                [
                    'user_id' => $userId,
                    'package_id' => $request->package_id,
                ],
                [
                    'email' => $user->email,
                    'checkout_state' => null, // Später erweitern
                    'last_step' => $request->last_step,
                    'abandoned_at' => now(),
                    'reminded_at' => null,
                    'reminder_stage' => 'none',
                    'expires_at' => now()->addDays(7), // 7 Tage gültig
                    'converted' => false,
                ]
            );

            Log::info("Abandoned checkout tracked for user {$userId}, package {$request->package_id}, step {$request->last_step}");

            return response()->json(['success' => true]);

        } catch (\Exception $e) {
            Log::error('Failed to track abandoned checkout: ' . $e->getMessage());
            return response()->json(['success' => false, 'message' => 'Failed to track checkout'], 500);
        }
    }
}