"""Convert pandas DataFrames to backtrader data feeds."""
import backtrader as bt
import pandas as pd


def df_to_bt_feed(df: pd.DataFrame) -> bt.feeds.PandasData:
    """Convert a standardized OHLCV DataFrame to a backtrader PandasData feed."""
    df = df.copy()
    df["date"] = pd.to_datetime(df["date"])
    df = df.set_index("date")
    df = df[["open", "high", "low", "close", "volume"]]
    return bt.feeds.PandasData(dataname=df)