from __future__ import annotations
from dataclasses import dataclass, field
from typing import Dict, List


@dataclass(frozen=True)
class Asset:
    symbol: str  # e.g., AAPL, SPY, ES
    asset_class: str  # e.g., equity, option, future


@dataclass(frozen=True)
class MarketSignal:
    asset: Asset
    price: float
    timestamp: float  # epoch seconds


@dataclass
class StrategyDelta:
    # Simple representation of target changes in positions
    delta_positions: Dict[str, float]  # symbol -> target share/contract delta
    cash_delta: float = 0.0
    notes: str = ""

    def validate(self) -> bool:
        # basic sanity: keys exist and values are finite numbers
        try:
            for k, v in self.delta_positions.items():
                if not isinstance(k, str) or not isinstance(v, (int, float)):
                    return False
            return True
        except Exception:
            return False


@dataclass
class PlanDelta:
    # A plan composed of a sequence of actions to reach target deltas
    actions: List[str] = field(default_factory=list)
    deltas: List[StrategyDelta] = field(default_factory=list)
    # Simple, fake signature placeholder for tamper-evidence in MVP
    signature: str = ""

    def add_action(self, action: str) -> None:
        self.actions.append(action)