from money.currency import Currency


class CurrencyPair:
    """Two currencies with directionality (from->to)."""

    def __init__(
        self, from_currency: Currency, to_currency: Currency
    ) -> "CurrencyPair":
        self.from_currency = from_currency
        self.to_currency = to_currency

    def get_reverse_pair(self) -> "CurrencyPair":
        return CurrencyPair(
            from_currency=self.to_currency, to_currency=self.from_currency
        )

    def __str__(self):
        return str(self.from_currency) + str(self.to_currency)

    def __eq__(self, other: "CurrencyPair") -> bool:
        return (self.from_currency == other.from_currency) and (
            self.to_currency == other.to_currency
        )

    def __repr__(self):
        return str(self)

    def __hash__(self):
        return hash((self.from_currency, self.to_currency))