from __future__ import annotations
from dataclasses import dataclass, asdict
from typing import Any, Dict, List
import json


@dataclass
class LocalProblem:
    id: str
    asset: str
    venue: str
    objective: str
    constraints: Dict[str, Any]
    price_target: float
    tolerance: float

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


@dataclass
class SharedVariables:
    variables: Dict[str, Any]
    version: int
    contract_id: str

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


@dataclass
class PlanDelta:
    delta: Dict[str, Any]
    timestamp: str
    author: str
    contract_id: str
    privacy_budget: float

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


@dataclass
class DualVariables:
    shadow_prices: Dict[str, float]
    version: int
    contract_id: str = ""

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


@dataclass
class AuditLogEntry:
    event: str
    timestamp: str
    hash: str
    details: Dict[str, Any] = None

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


@dataclass
class GovernanceAuditLog:
    entries: List[AuditLogEntry]

    def add(self, entry: AuditLogEntry) -> None:
        self.entries.append(entry)

    def to_json(self) -> str:
        return json.dumps([asdict(e) for e in self.entries], default=str)