from __future__ import annotations

from typing import Dict

from .dsl import PlanDelta


class Backtester:
    """Toy deterministic replay-based backtester for MVP."""

    def run(self, plan: PlanDelta) -> Dict[str, float]:
        # Deterministic pseudo-PnL based on number of hedges and total_cost
        hedge_count = len(plan.hedges)
        pnl = max(0.0, 100.0 - plan.total_cost * 2.0) if hedge_count > 0 else 0.0
        return {"deterministic_pnl": pnl, "hedge_count": hedge_count}