helpers.py

from datetime import datetime, timedelta, date as _d
import json
from json.decoder import JSONDecodeError
import math

D0 = _d(2000, 1, 1)  # this is the defualt reference point


def getDateDelta(date):

    if not isinstance(date, datetime) and not isinstance(date, _d):
        date = _d.fromisoformat(date)

    delta = date - D0
    return delta.days - 1  # - 1 to fix the final date as the date before due


def getDatefromDelta(delta):
    date = D0 + timedelta(days=(delta + 1))
    return date.strftime("%Y-%m-%d")


def isWeekend(date):
    date = datetime.fromisoformat(date)

    weekno = date.weekday()
    if weekno == 5:
        return 1
    elif weekno == 6:
        return 2
    else:
        return 0


def save(newtasks):
    to_save = {}
    for name, model in newtasks.items():
        to_save[model.id] = [
            model.k,
            model.gradient,
            [math.ceil(model.start_day), model.due_date - 1],
            model.today,
            0,
            name[1],
        ]

    with open("tasks.json") as json_file:
        try:
            data = json.load(json_file)
            to_save.update(data)
        except JSONDecodeError:
            pass

    with open("tasks.json", "w") as outfile:
        json.dump(to_save, outfile)