#!/usr/bin/env python3

import sys
import datetime
import arrow
import argparse

from tconnectsync.api import TConnectApi
from tconnectsync.process import process_time_range
from tconnectsync.autoupdate import process_auto_update
from tconnectsync.check import check_login

try:
    from tconnectsync.secret import (
        TCONNECT_EMAIL,
        TCONNECT_PASSWORD
    )
except Exception:
    print('Unable to read secret.py')
    sys.exit(1)


def parse_args():
    parser = argparse.ArgumentParser(description="Syncs bolus, basal, and IOB data from Tandem Diabetes t:connect to Nightscout.")
    parser.add_argument('--pretend', dest='pretend', action='store_const', const=True, default=False, help='Pretend mode: do not upload any data to Nightscout.')
    parser.add_argument('--start-date', dest='start_date', type=str, default=None, help='The oldest date to process data from. Must be specified with --end-date.')
    parser.add_argument('--end-date', dest='end_date', type=str, default=None, help='The newest date to process data until (inclusive). Must be specified with --start-date.')
    parser.add_argument('--days', dest='days', type=int, default=1, help='The number of days of t:connect data to read in. Cannot be used with --from-date and --until-date.')
    parser.add_argument('--auto-update', dest='auto_update', action='store_const', const=True, default=False, help='If set, continuously checks for updates from t:connect and syncs with Nightscout.')
    parser.add_argument('--check-login', dest='check_login', action='store_const', const=True, default=False, help='If set, checks that the provided t:connect credentials can be used to log in.')

    return parser.parse_args()

def main():
    args = parse_args()

    if args.auto_update and (args.start_date or args.end_date):
        raise Exception('Auto-update cannot be used with start/end date')

    if args.start_date and args.end_date:
        time_start = arrow.get(args.start_date)
        time_end = arrow.get(args.end_date)
    else:
        time_end = datetime.datetime.now()
        time_start = time_end - datetime.timedelta(days=args.days)

    if time_end < time_start:
        raise Exception('time_start must be before time_end')

    tconnect = TConnectApi(TCONNECT_EMAIL, TCONNECT_PASSWORD)

    if args.check_login:
        return check_login(tconnect, time_start, time_end)

    if args.auto_update:
        print("Starting auto-update between", time_start, "and", time_end, "(PRETEND)" if args.pretend else "")
        process_auto_update(tconnect, time_start, time_end, args.pretend)
    else:
        print("Processing data between", time_start, "and", time_end, "(PRETEND)" if args.pretend else "")
        added = process_time_range(tconnect, time_start, time_end, args.pretend)
        print("Added", added, "items")

if __name__ == '__main__':
    main()