from pandas import DataFrame, Series

from daily_data import get_daily_data

def signals(data: DataFrame) -> Series:
    """
    Generate long signals based on the TRIN Thrusts strategy.

    Returns a Series with 'L' for long signals and 'N' for no signal.
    """
    start_date = data['Date'].min()
    end_date = data['Date'].max()
    trin_data = get_daily_data(symbol = 'RINT.Z', start_date = start_date, end_date = end_date)

    trin_change = trin_data['Close'].pct_change()
    trin_30_below = trin_change <= -0.4

    signals = Series('N', index = data.index)
    signals[trin_30_below] = 'L'
    return signals