import yfinance as yf


def stock_exists(ticker):
    try:
        return yf.Ticker(ticker).info
    except KeyError:
        return False


def stock_info(ticker):
    if not (stock := stock_exists(ticker)):
        return False

    return stock


def stock_history(ticker, timespan="6mo", interval="1d"):
    if not stock_exists(ticker):
        return False

    return yf.Ticker(stock).history("6mo", interval="1d", prepost=True)


def get_current_price(ticker):
    yf_obj = yf.Ticker(ticker)
    todays_data = yf_obj.history(period="1d")
    return round(todays_data["Close"][0], 2)


def get_delta(ticker, return_old_price=False):
    yf_obj = yf.Ticker(ticker)
    old_price = yf_obj.history(interval="1d")["Close"][-2]
    current_price = get_current_price(ticker)
    delta = 100 * ((current_price / old_price) - 1)
    if return_old_price:
        return delta, old_price
    else:
        return delta


def get_delta_old_price(ticker):
    yf_obj = yf.Ticker(ticker)
    return yf_obj.history(interval="1d")["Close"][-2]