from abc import ABC, abstractmethod
from core.models import Signal

class Strategy(ABC):
    name = "base"

    def __init__(self, timeframe: str, params: dict):
        self.timeframe, self.p = timeframe, params

    @abstractmethod
    def on_bar(self, symbol: str, df) -> "Signal | None":
        """df = barres clôturées uniquement. Retourne un Signal ou None."""