"""交易上下文：设置读取、资金、模式。"""
from __future__ import annotations

from typing import Callable, Optional

TRADING_MODE_SIM = "simulation"  # SimNow CTP
TRADING_MODE_LIVE = "live"       # 期货公司 CTP


def get_trading_mode(get_setting: Callable[[str, str], str]) -> str:
    m = (get_setting("trading_mode", TRADING_MODE_SIM) or TRADING_MODE_SIM).strip().lower()
    return m if m in (TRADING_MODE_SIM, TRADING_MODE_LIVE) else TRADING_MODE_SIM


def get_sizing_mode(get_setting: Callable[[str, str], str]) -> str:
    from position_sizing import normalize_sizing_mode
    return normalize_sizing_mode(get_setting("position_sizing_mode", "fixed"))


def get_fixed_lots(get_setting: Callable[[str, str], str]) -> int:
    try:
        return max(1, int(float(get_setting("fixed_lots", "1") or 1)))
    except (TypeError, ValueError):
        return 1


def get_fixed_amount(get_setting: Callable[[str, str], str]) -> float:
    try:
        return max(1.0, float(get_setting("fixed_amount", "5000") or 5000))
    except (TypeError, ValueError):
        return 5000.0


def get_risk_percent(get_setting: Callable[[str, str], str]) -> float:
    try:
        return max(0.1, float(get_setting("risk_percent", "1") or 1))
    except (TypeError, ValueError):
        return 1.0


def get_max_margin_pct(get_setting: Callable[[str, str], str]) -> float:
    """单笔/总仓位保证金占权益上限（%），默认 30。"""
    try:
        return max(1.0, min(100.0, float(get_setting("max_margin_pct", "30") or 30)))
    except (TypeError, ValueError):
        return 30.0


def get_trailing_be_tick_buffer(get_setting: Callable[[str, str], str]) -> int:
    """移动保本：止损移至开仓价 ± N 个最小变动价位（默认 2）。"""
    try:
        return max(1, min(20, int(float(get_setting("trailing_be_tick_buffer", "2") or 2))))
    except (TypeError, ValueError):
        return 2


def get_pending_order_timeout_min(get_setting: Callable[[str, str], str]) -> int:
    """开仓限价委托未成交自动撤单时间（分钟），默认 5。"""
    try:
        return max(1, min(60, int(float(get_setting("pending_order_timeout_min", "5") or 5))))
    except (TypeError, ValueError):
        return 5


def get_pending_order_timeout_sec(get_setting: Callable[[str, str], str]) -> int:
    return get_pending_order_timeout_min(get_setting) * 60


def get_account_capital(conn, get_setting: Callable[[str, str], str]) -> float:
    """优先 SimNow/期货公司 CTP 权益；未连接时用设置中的参考资金。"""
    del conn
    mode = get_trading_mode(get_setting)
    try:
        from vnpy_bridge import ctp_status, get_ctp_balance

        st = ctp_status(mode)
        if st.get("connected"):
            bal = get_ctp_balance(mode)
            if bal and bal > 0:
                return float(bal)
    except Exception:
        pass
    try:
        return float(get_setting("live_capital", "0") or 0)
    except (TypeError, ValueError):
        return 0.0


def trading_mode_label(get_setting: Callable[[str, str], str]) -> str:
    return "SimNow" if get_trading_mode(get_setting) == TRADING_MODE_SIM else "期货公司实盘"