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


@dataclass
class LocalProblem:
    id: str
    domain: str
    assets: List[str]
    constraints: Dict[str, Any] = field(default_factory=dict)
    objective: Dict[str, Any] = field(default_factory=dict)
    solver_hint: Optional[str] = None


@dataclass
class SharedVariables:
    version: int
    signals: Dict[str, Any] = field(default_factory=dict)
    privacy_tag: Optional[str] = None
    aggregation_method: str = "mean"


@dataclass
class PlanDelta:
    delta: Dict[str, Any]
    timestamp: datetime
    author: str
    contract_id: str
    signature: Optional[str] = None
    safety_tags: Optional[List[str]] = None


@dataclass
class DualVariables:
    lagrange_multipliers: Dict[str, float] = field(default_factory=dict)
    convergence_status: Optional[str] = None


@dataclass
class AuditLog:
    entries: List[Dict[str, Any]] = field(default_factory=list)
    last_updated: Optional[datetime] = None


@dataclass
class PrivacyBudget:
    budget: float
    spent: float = 0.0
    policy: Dict[str, Any] = field(default_factory=dict)


@dataclass
class RegistryMetadata:
    contract_version: str
    adapter_id: str
    replay_hint: Optional[str] = None