"""German number/currency formatting for display (1.234,56 €)."""
from app import i18n


def de_number(value, decimals=2):
    if value is None or value == "":
        return ""
    formatted = f"{float(value):,.{decimals}f}"          # 1,234.56
    return formatted.replace(",", "\x00").replace(".", ",").replace("\x00", ".")


def euro(value):
    if value is None or value == "":
        return ""
    return f"{de_number(value)} €"


WEEKDAYS = i18n.t("weekdays_short")


def de_date_wd(iso):
    """'Mo 13.09.2026' — the weekday before the date, so the lists show at once which day an arrival or
    departure falls on (weekly prices run from weekday to weekday)."""
    import datetime
    text = de_date(iso)
    if not text:
        return text
    try:
        day = datetime.date.fromisoformat(str(iso)[:10])
    except ValueError:
        return text                      # not a real date (a month name or the like) — leave it as it is
    # a non-breaking space: on paper the table would otherwise break between weekday and date
    # ("So" on one line, "13.09.2026" on the next)
    return f"{WEEKDAYS[day.weekday()]} {text}"


def de_date(iso):
    """ISO yyyy-mm-dd -> German dd.mm.yyyy for display."""
    if not iso:
        return ""
    try:
        y, m, d = str(iso).split("-")
        return f"{d}.{m}.{y}"
    except ValueError:
        return str(iso)