from __future__ import annotations

from typing import Dict, Any, List
from .core import PlanDelta


class ExecutionRouter:
    """Routing layer that assigns a venue to a given PlanDelta."""

    def __init__(self, venues: List[str]):
        self.venues = venues or []

    def route(self, plan: PlanDelta) -> Dict[str, Any]:
        venue = self.venues[0] if self.venues else None
        routed_plan = PlanDelta(deltas=plan.deltas, venue=venue, author=plan.author, timestamp=plan.timestamp)
        return {
            "routed": True,
            "venue": venue,
            "plan": routed_plan,
        }


# Backwards-compatibility alias (if any downstream code imports ExecutionEngine)
class ExecutionEngine(ExecutionRouter):
    pass


__all__ = ["ExecutionRouter", "ExecutionEngine"]