from __future__ import annotations
from typing import List
from .dsl import MarketSignal, PlanDelta, StrategyDelta

class ADMMCoordinator:
    """
    Lightweight ADMM-like coordinator.
    It collects MarketSignals from multiple venues and emits a PlanDelta
    representing a synchronized hedging action.
    This is a minimal, deterministic stub suitable for MVP testing.
    """
    def __init__(self, contract_id: str = "default-contract"):
        self.contract_id = contract_id
        self.last_plan: PlanDelta | None = None

    def reconcile(self, plan: PlanDelta) -> PlanDelta:
        # Minimal reconciliation: produce a single StrategyDelta placeholder to indicate coherence.
        merged = StrategyDelta(notes="reconciled")
        # Augment plan with lightweight dual/consensus metadata to simulate an ADMM-like
        # cross-venue coherence step. This is intentionally a small stub for MVP testing.
        dual_vars = {"rho": 1.0, "alpha": 0.5}
        new_plan = PlanDelta(
            deltas=[merged],
            timestamp=getattr(plan, "timestamp", 0.0),
            author=getattr(plan, "author", None),
            contract_id=self.contract_id,
            actions=getattr(plan, "actions", []),
            dual_vars=dual_vars,
        )
        self.last_plan = new_plan
        return new_plan

# Compatibility shim for existing runtime that imports Coordinator
class Coordinator(ADMMCoordinator):
    def __init__(self, contract_id: str = "default-contract"):
        super().__init__(contract_id=contract_id)

    def coordinate(self, signals, author: str = "coordinator") -> PlanDelta:
        # Lightweight, deterministic plan synthesis for MVP
        merged = StrategyDelta(notes="coordinated")
        # Propagate a minimal coherence envelope along with a pointer to the contract id.
        dual_vars = {"rho": 1.0, "alpha": 0.9}
        return PlanDelta(
            deltas=[merged],
            timestamp=0.0,
            author=author,
            contract_id=self.contract_id,
            actions=[],
            dual_vars=dual_vars,
        )