import logging
import secrets
from threading import Lock

from .http import get_json

API_HOST = "http://139.224.247.176:13499"
MARKET_URL, PERIOD, HTTP_TIMEOUT = "/a/market", "60m", 5.0
_market_lock = Lock()
_market_status = "UNKNOWN"


def status(payload) -> str:
    value = payload.get("data", payload) if isinstance(payload, dict) else payload
    if isinstance(value, list): value = value[-1] if value else None
    if isinstance(value, dict): value = value.get("action", value.get("status", value.get("signal")))
    result = str(value).strip().upper()
    return result if result in {"UP", "DOWN", "NEUTRAL"} else "UNKNOWN"


def refresh_market(api_host: str = API_HOST) -> str:
    """由后台调度线程刷新大盘状态；请求失败时缓存为 UNKNOWN。"""
    global _market_status
    url = f"{api_host}{MARKET_URL}?period={PERIOD}&t={secrets.token_urlsafe(12)}"
    try:
        result = status(get_json(url, HTTP_TIMEOUT))
    except Exception as exc:
        result = "UNKNOWN"
        logging.error("获取大盘指数失败: %s %s", url, exc)
    with _market_lock:
        _market_status = result
    logging.info("大盘信号: url=%s status=%s", url, result)
    return result


def market_allow_open() -> bool:
    """读取最近一次后台刷新得到的大盘缓存；未知状态时禁止开仓。"""
    with _market_lock:
        return _market_status == "UP"