# forecasting/base.py
from typing import List, Dict, Any
import pandas as pd
import numpy as np


class ForecastProvider:
    def get_forecasts(self, 
                    historical_data: pd.DataFrame,
                    forecast_horizons: List[int],
                    optimization_horizon: int) -> Dict[int, np.ndarray]:
        """Returns forecasts for each requested horizon."""
        pass

    def get_required_lookback(self) -> int:
        """Returns the minimum number of historical data points required."""
        pass

    def get_forecast_horizons(self) -> List[int]:
        """Returns the list of forecast horizons."""
        pass