"""Polling scheduler — 시간대별 분기 + 휴장일 처리."""
from __future__ import annotations
import json
import logging
from datetime import datetime, timedelta, time
from pathlib import Path
from zoneinfo import ZoneInfo

logger = logging.getLogger(__name__)

KST = ZoneInfo("Asia/Seoul")
_HOLIDAYS_PATH = Path(__file__).parent / "holidays.json"
_HOLIDAYS: set[str] = set(json.loads(_HOLIDAYS_PATH.read_text(encoding="utf-8")))

# Market windows
_PRE_OPEN = time(7, 0)
_OPEN = time(9, 0)
_CLOSE = time(15, 30)
_POST_END = time(20, 0)


def _is_market_day(now: datetime) -> bool:
    """평일 + 휴장일 아닌 날."""
    if now.weekday() >= 5:  # Sat/Sun
        return False
    return now.strftime("%Y-%m-%d") not in _HOLIDAYS


def _is_polling_window(now: datetime) -> bool:
    """현재 시각이 폴링 윈도우 (07:00-20:00) 안인가."""
    return _PRE_OPEN <= now.time() < _POST_END


def _next_interval(now: datetime) -> float:
    """다음 폴링까지 sleep 초수."""
    if not _is_market_day(now):
        return _seconds_until_next_market_open(now)

    t = now.time()
    if _PRE_OPEN <= t < _OPEN:
        return 300.0
    elif _OPEN <= t < _CLOSE:
        return 60.0
    elif _CLOSE <= t < _POST_END:
        return 300.0
    else:
        return _seconds_until_next_market_open(now)


def _seconds_until_next_market_open(now: datetime) -> float:
    """다음 영업일의 07:00 KST 까지 초수."""
    candidate = now.replace(hour=7, minute=0, second=0, microsecond=0)
    if candidate <= now:
        candidate += timedelta(days=1)

    for _ in range(14):  # safety bound (max 2 weeks of holidays)
        if _is_market_day(candidate):
            return (candidate - now).total_seconds()
        candidate += timedelta(days=1)

    logger.warning("could not find next market day within 14 days; using +1 day")
    return 86400.0