from __future__ import annotations

from dataclasses import dataclass, field
from typing import List, Optional


@dataclass
class Asset:
    symbol: str
    asset_type: str = "equity"  # or option, future, etc.


@dataclass
class MarketSignal:
    asset: Asset
    price: float
    timestamp: float
    liquidity: float = 1.0
    implied_vol: Optional[float] = None


@dataclass
class StrategyDelta:
    asset: Asset
    hedge_ratio: float
    target_pnl: float
    constraints: Optional[List[str]] = field(default_factory=list)


@dataclass
class PlanDelta:
    steps: List[str] = field(default_factory=list)
    timestamp: float = 0.0
    provenance: Optional[str] = None


# Lightweight placeholders for governance primitives
@dataclass
class DualVariables:
    values: List[float] = field(default_factory=list)


@dataclass
class PrivacyBudget:
    budget: float = 0.0


@dataclass
class AuditLog:
    entries: List[str] = field(default_factory=list)


@dataclass
class PolicyBlock:
    name: str
    rules: List[str] = field(default_factory=list)