GetCurrentScheduledProgram

class GetCurrentScheduledProgram(KPFFunction):
    '''Return the program ID (e.g. E123) of the program that is currently
    scheduled. Note that this will only return a program if we are between the
    start and end times on the schedule. Officially, the night starts and ends
    at 12 degree twilight), so it is possible for observing to be happening
    before there is an officially scheduled program.
    '''
    @classmethod
    def pre_condition(cls, args):
        pass

    @classmethod
    def perform(cls, args):
        '''Returns the currently scheduled program ID.
        '''
        if args.get('datetime', 'now') == 'now':
            inputdateUT = datetime.datetime.utcnow()
        else:
            inputdateHST = datetime.datetime.strptime(args.get('datetime'), '%Y-%m-%dT%H:%M:%S')
            inputdateUT = inputdateHST + datetime.timedelta(hours=10)
        startdate = inputdateUT - datetime.timedelta(days=1)
        UTdecimal_hour = inputdateUT.hour + inputdateUT.minute/60

        params = {'date': startdate.strftime('%Y-%m-%d'),
                  'numdays': 1,
                  'telnr': args.get('telnr', 1),
                  'instrument': 'KPF'}
        all_programs = query_observatoryAPI('schedule', 'getSchedule', params)

        progname = None
        for program in all_programs:
            prog_start = string_time_to_decimal(program.get('StartTime'))
            prog_end = string_time_to_decimal(program.get('EndTime'))
            if UTdecimal_hour >= prog_start and UTdecimal_hour <= prog_end:
                progname = program.get('ProjCode')
        return progname

    @classmethod
    def post_condition(cls, args):
        pass

    @classmethod
    def add_cmdline_args(cls, parser):
        parser.add_argument('datetime', type=str, default='now',
            help='The HST date and time to retrieve (%Y-%m-%dT%H:%M:%S).')
        return super().add_cmdline_args(parser)