VALID_PRICE_PREFS = ("total", "sqft", "both")


def get_price_pref(request) -> str:
    pref = request.cookies.get("price_pref", "total")
    if pref not in VALID_PRICE_PREFS:
        pref = "total"
    return pref


def format_price(value: int, price_pref: str = "total", area_sqft: int = 0) -> str:

    if area_sqft > 0:
        unit_price = round(value / area_sqft)
        if price_pref == "sqft":
            return f"${unit_price:,}/sqft"
        if price_pref == "both":
            return f"${value:,} (${unit_price:,}/sqft)"
    return f"${value:,}"