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from dataclasses import dataclass
import datetime
import re
from dataclass_defs import ProcessedRow, SheetsRow

INTERVAL_ABBREVS = {
    "pv": datetime.timedelta(days=1),
    "vk": datetime.timedelta(days=7),
    "kk": datetime.timedelta(days=30),
    "v": datetime.timedelta(days=365),
}


def _calculate_interval(interval_str: str):
    match = re.search(r"(\d+)(\w+)", interval_str)
    number = int(match[1])
    abbrev = match[2]

    try:
        interval = INTERVAL_ABBREVS[abbrev]
    except KeyError:
        raise Exception(f'"{interval_str}" is an invalid interval string!')

    total_interval = datetime.timedelta(seconds=interval.total_seconds() * number)
    return total_interval


def _timestamp_to_date(timestamp: str) -> datetime.datetime:
    return datetime.datetime.strptime(timestamp, "%Y-%m-%d")


def _date_to_timestamp(date: datetime.datetime) -> str:
    return datetime.datetime.strftime(date, "%Y-%m-%d")


def _process_row(row: SheetsRow):
    interval = _calculate_interval(row.interval)
    last_done_date = _timestamp_to_date(row.last_done)
    next_date = last_done_date + interval
    next_date_str = _date_to_timestamp(next_date)

    return ProcessedRow(
        name=row.name,
        next_datestamp=next_date_str,
        next_date=next_date,
        last_datestamp=row.last_done,
        last_date=last_done_date,
        interval=row.interval,
    )


def process_rows(rows: list[SheetsRow]) -> list[ProcessedRow]:
    return list(map(_process_row, rows))


def _is_this_week(processed_row: ProcessedRow):
    next_date = processed_row.next_date
    now = datetime.datetime.now()
    return (next_date - now) < datetime.timedelta(weeks=1)


def filter_only_this_week(rows: list[ProcessedRow]) -> list[ProcessedRow]:
    return list(filter(_is_this_week, rows))