"""Core data contracts for BeVault MVP (toy DSL seeds)."""
from __future__ import annotations
from dataclasses import dataclass, field
from typing import List, Optional
import time


@dataclass
class LocalArbProblem:
    asset: str
    objective: str  # e.g., 'min_cost', 'maximize_profit'
    risk_budget: float
    constraints: dict = field(default_factory=dict)


@dataclass
class SharedSignals:
    asset: str
    price: float
    latency_ms: float
    timestamp: float = field(default_factory=lambda: time.time())
    metadata: dict = field(default_factory=dict)


@dataclass
class HedgeDelta:
    asset: str
    hedge_size: float
    timestamp: float = field(default_factory=lambda: time.time())
    policy_tag: str = "default"
    signature: Optional[str] = None


@dataclass
class AuditLog:
    events: List[str] = field(default_factory=list)
    entry_ts: float = field(default_factory=lambda: time.time())


@dataclass
class PrivacyBudget:
    asset: str
    remaining: float
    reset_epoch: float = field(default_factory=lambda: time.time())


__all__ = [
    "LocalArbProblem",
    "SharedSignals",
    "HedgeDelta",
    "AuditLog",
    "PrivacyBudget",
    # Toy DSL seed helper (MVP utility)
    "generate_toy_seed",
]


def generate_toy_seed(asset: str = "AAPL", price: float = 100.0):
    """Generate a minimal toy DSL seed pair for MVP testing.

    Returns a tuple of (LocalArbProblem, SharedSignals) suitable for
    driving a toy cross-venue hedge scenario and deterministic delta-sync
    tests without requiring real market data.

    This helper is intentionally lightweight and is meant for local testing
    and documentation purposes within the MVP boundaries.
    """
    from time import time

    local = LocalArbProblem(
        asset=asset,
        objective="min_cost",
        risk_budget=float(price) * 0.1,
        constraints={},
    )

    signals = SharedSignals(
        asset=asset,
        price=price,
        latency_ms=0.5,
        timestamp=time(),
        metadata={"toy_seed": True},
    )

    return local, signals