from __future__ import annotations

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


@dataclass
class LocalProblem:
    id: str
    asset: str
    objective: str
    constraints: Dict[str, object] = field(default_factory=dict)
    version: int = 1


@dataclass
class SharedVariables:
    contract_id: str
    variables: Dict[str, object] = field(default_factory=dict)
    version: int = 1


@dataclass
class PlanDelta:
    delta: Dict[str, object]
    timestamp: int
    author: Optional[str] = None
    contract_id: Optional[str] = None
    privacy_budget: Optional[float] = None


@dataclass
class AuditLog:
    entries: List[str] = field(default_factory=list)
    signer: Optional[str] = None
    timestamp: Optional[int] = None
    contract_id: Optional[str] = None


# Backwards-compat alias for external imports
DSLAuditLog = AuditLog