import datetime
import logging
import pathlib
from typing import Union

from currencies import Currency

from xexe.constants import DEFAULT_CURRENCIES
from xexe.utils import DateRange

logger = logging.getLogger()


def handle_get_rates_inputs(
    start_date: Union[datetime.datetime, datetime.date],
    end_date: Union[datetime.datetime, datetime.date],
    currencies: Union[None, str],
    dry_run: bool,
    output: Union[str, pathlib.Path],
):
    logger.info("Handling inputs.")

    date_range = DateRange(start_date=start_date.date(), end_date=end_date.date())

    if date_range.end_date > datetime.datetime.today().date():
        date_range.end_date = datetime.datetime.today().date()

    if currencies:
        # CLI input comes as string of comma-separated currency codes
        currencies = [currency_code.strip() for currency_code in currencies.split(",")]
        tmp = [Currency(currency_code) for currency_code in currencies]
        currencies = tmp

    if currencies is None:
        currencies = DEFAULT_CURRENCIES

    # The Path constructor is idempotent, so this works equally fine if output
    # is a string or an actual Path object.
    output = pathlib.Path(output)
    if output.suffix != ".csv":
        raise ValueError("Output must be a .csv file.")

    prepared_inputs = {
        "date_range": date_range,
        "currencies": currencies,
        "dry_run": dry_run,
        "output": output,
    }

    logger.debug(prepared_inputs)
    return prepared_inputs