public function HorariosOcupados($dia_cita)
 {
     $dayOfWeek = Carbon::now()->dayOfWeek;
     if ($dayOfWeek >= $dia_cita) {
         $citaInicial = Carbon::now()->next($dia_cita);
     } else {
         $citaInicial = Carbon::now()->next($dia_cita)->addWeek();
     }
     $citas = Cita::distinct()->select('hora_id')->whereDia_id($dia_cita)->where('fecha', '>=', $citaInicial->toDateString())->groupBy('hora_id')->get();
     $horasIds = array();
     foreach ($citas as $cita) {
         $horasIds[] = $cita->hora_id;
     }
     return $horasIds;
 }