"""OKX 交易模式(币本位期权专用机:仅单独期权).

历史 .env 若仍为 perp_options / options_options,读取时归一为 options,
对冲模块已移除,不可再启用.
"""
from __future__ import annotations

import os
from typing import Optional

MODE_OPTIONS = "options"
# 兼容旧配置名,不再作为可选模式
MODE_PERP = "perp_options"
MODE_OO = "options_options"
VALID_MODES = frozenset({MODE_OPTIONS})
UI_MODES = frozenset({MODE_OPTIONS})

_ALIASES = {
    "option": MODE_OPTIONS,
    "standalone": MODE_OPTIONS,
    "期权": MODE_OPTIONS,
    "单独期权": MODE_OPTIONS,
    "po": MODE_OPTIONS,
    "perp": MODE_OPTIONS,
    "perp_options": MODE_OPTIONS,
    "永期": MODE_OPTIONS,
    "永期对冲": MODE_OPTIONS,
    "oo": MODE_OPTIONS,
    "options_options": MODE_OPTIONS,
    "期期": MODE_OPTIONS,
    "期期对冲": MODE_OPTIONS,
}


def normalize_okx_trade_mode(raw: Optional[str] = None) -> str:
    s = str(raw or "").strip().lower()
    if s in VALID_MODES:
        return s
    if s in _ALIASES:
        return _ALIASES[s]
    # 未知或空 → 单独期权
    return MODE_OPTIONS


def legacy_infer_okx_trade_mode() -> str:
    return MODE_OPTIONS


def get_okx_trade_mode() -> str:
    return normalize_okx_trade_mode(os.getenv("OKX_TRADE_MODE"))


def hedge_module_enabled() -> bool:
    return False


def show_perp_options() -> bool:
    return False


def show_options_options() -> bool:
    return False


def standalone_options_open_allowed() -> bool:
    return True


def mode_label(mode: Optional[str] = None) -> str:
    return "单独期权"


def block_standalone_open_by_mode_msg() -> Optional[str]:
    return None