SetLFCtoStandbyHigh

class SetLFCtoStandbyHigh(KPFFunction):
    '''Set the Laser Frequency Comb (LFC) to "StandbyHigh" mode. This is the
    mode which should be set after operation of the LFC for science is complete.

    KTL Keywords Used:

    - `kpfcal.OPERATIONMODE`
    - `kpfmon.HB_MENLOSTA`
    - `kpfmon.LFCREADYSTA`
    '''
    @classmethod
    def pre_condition(cls, args):
        heartbeat = ktl.cache('kpfmon', 'HB_MENLOSTA')
        success = heartbeat.waitFor('== "OK"', timeout=3)
        if success is False:
            raise FailedPreCondition(f"Menlo heartbeat is not OK: {heartbeat.read()}")
        lfc_mode = ktl.cache('kpfcal', 'OPERATIONMODE').read()
        if lfc_mode not in ['AstroComb', 'StandbyHigh']:
            raise FailedPreCondition(f"LFC must be in AstroComb: {lfc_mode}")

    @classmethod
    def perform(cls, args):
        lfc_mode = ktl.cache('kpfcal', 'OPERATIONMODE')
        log.info('Setting LFC to StandbyHigh')
        lfc_mode.write('StandbyHigh')
        time_shim = cfg.getfloat('times', 'LFC_shim_time', fallback=10)
        time.sleep(time_shim)

    @classmethod
    def post_condition(cls, args):
        pass