from dataclasses import dataclass, field
from datetime import date


@dataclass
class BacktestConfig:
    symbols: list[str] = field(default_factory=lambda: ["sh600000"])
    start_date: str = "2023-01-01"
    end_date: str = "2024-12-31"
    initial_cash: float = 1_000_000.0
    commission: float = 0.0003  # 0.03% for Chinese A-shares
    stamp_duty: float = 0.001   # 0.1% stamp duty on sells only (handled in strategy)
    adjust: str = "qfq"
    sizer_percent: float = 0.95  # fraction of portfolio per trade