from __future__ import annotations

from dataclasses import dataclass


@dataclass(slots=True)
class Signal:
    bias: str  # call_ask_gt_put | put_ask_gt_call
    option_side: str  # call | put
    perp_side: str  # long | short
    call_ask: float
    put_ask: float


def decide(call_ask: float | None, put_ask: float | None) -> Signal | None:
    if call_ask is None or put_ask is None:
        return None
    if call_ask > put_ask:
        return Signal(
            bias="call_ask_gt_put",
            option_side="call",
            perp_side="short",
            call_ask=float(call_ask),
            put_ask=float(put_ask),
        )
    if put_ask > call_ask:
        return Signal(
            bias="put_ask_gt_call",
            option_side="put",
            perp_side="long",
            call_ask=float(call_ask),
            put_ask=float(put_ask),
        )
    return None