from __future__ import annotations
from dataclasses import dataclass, asdict
from typing import Optional
import json


@dataclass
class LocalTrade:
    trade_id: str
    product_id: str
    venue: str
    price: float
    size: int
    side: str  # 'buy' or 'sell'
    timestamp: float
    signer_id: str
    signature: str

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)


@dataclass
class SharedSignals:
    signals_version: int
    aggregated_risk: float  # placeholder for aggregated risk metric
    margin_impact: float
    liquidity_metric: float

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)


@dataclass
class PlanDelta:
    delta_version: int
    timestamp: float
    allocations: dict  # mapping from trade_id to new allocation
    cryptographic_tag: str

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)


@dataclass
class PrivacyBudget:
    budget_id: str
    max_privacy_leakage: float
    spent_privacy: float

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)


@dataclass
class AuditLog:
    event_id: str
    timestamp: float
    actor: str
    action: str
    details: Optional[str] = None

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)


@dataclass
class ComplianceEvent:
    event_id: str
    venue: str
    constraint: str
    violated: bool
    timestamp: float
    details: Optional[str] = None

    def to_json(self) -> str:
        return json.dumps(asdict(self), sort_keys=True)