from __future__ import annotations
from dataclasses import dataclass
from datetime import datetime
from deltaforge.dsl import SharedSignals, PlanDelta, LocalArbProblem


def reconcile(signals: SharedSignals, problems: list[LocalArbProblem], plan: PlanDelta) -> PlanDelta:
    # Very lightweight cross-venue coherence check.
    # Ensure that for delta-hedge style plans, net delta sums close to zero (delta-neutral) as a toy constraint.
    net = sum(plan.delta.values()) if plan and plan.delta else 0.0
    if abs(net) > 1e-6:
        # Adjust plan by distributing remaining delta to the first asset if possible
        if plan.delta:
            first = next(iter(plan.delta))
            plan.delta[first] = plan.delta[first] - net
        else:
            plan.delta = {"default": -net}
    # Attach a lightweight audit tag
    plan.safety_tags = plan.safety_tags if hasattr(plan, 'safety_tags') else []
    plan.safety_tags.append("reconciled-by-curator-at-{}".format(datetime.utcnow().isoformat()))
    return plan