"""Ports that keep selection formulas independent from storage technology."""

from __future__ import annotations

from datetime import date
from typing import Protocol

from .models import StockHistory
from .runs import SelectionExecutionSource, SelectionUniverseReader


class MarketDataReaderError(RuntimeError):
    """A market-data adapter could not complete a read."""


class MarketDataReader(Protocol):
    """Read qfq history sufficient for one historical strategy evaluation."""

    def load_history(self, ts_code: str, target_trade_date: date) -> StockHistory: ...


__all__ = [
    "MarketDataReader",
    "MarketDataReaderError",
    "SelectionExecutionSource",
    "SelectionUniverseReader",
]