helpers.py

import datetime
from typing import Dict, List

from apps.orders.models import OrderQuerySet


def split_by_order_dates(available_dates: List[Dict[str, datetime.datetime]],
                         ordered_dates: 'OrderQuerySet') -> List[Dict[str, datetime.datetime]]:
    """
    It removes dates allocated by accepted Orders from available schedule dates.
    :param available_dates: list of advert's available Schedule,
    :param ordered_dates: list of start/end dates of accepted orders by this particular advert,
    :return: list available schedule subtract accepted orders dates.
    """
    return_dates = list(available_dates)
    if len(ordered_dates) == 0:
        return return_dates
    for out in ordered_dates:
        for inner in return_dates:
            if inner['start_date'] < out['end_date'] <= inner['end_date'] and inner['end_date'] > out['start_date']:
                return_dates += [{'start_date': inner['start_date'], 'end_date': out['start_date']},
                                 {'start_date': out['end_date'], 'end_date': inner['end_date']}]
                return_dates.remove(inner)
    return return_dates