#!/usr/bin/env python3
"""Scheduler loop for the news summarizer.

15-minute analyst (NEWS_SUMMARIZE_INTERVAL_S, default 900s) plus a daily
recap at 23:00 in TZ (default America/New_York) over the last 24 hours.

Serial: a slow LLM pass never overlaps the next.

Env (all optional, 12-factor):
  NEWS_SUMMARIZE_INTERVAL_S    seconds between analyst runs (default 900)
  NEWS_SUMMARIZE_RUN_ON_START  "1" to summarize once immediately on boot (default 1)
  NEWS_RECAP_HOUR / MINUTE     wall-clock recap time (default 23:00)
  TZ                           IANA tz (default America/New_York)
  NOUS_API_KEY                 optional in env; Keys UI / api_keys also works
"""

from __future__ import annotations

import logging
import os
import subprocess
import sys
import time
from datetime import datetime, timedelta
from zoneinfo import ZoneInfo

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s: %(message)s")
logger = logging.getLogger("news.summarizer.scheduler")

INTERVAL_S = max(1, int(os.getenv("NEWS_SUMMARIZE_INTERVAL_S", "900")))
RUN_ON_START = os.getenv("NEWS_SUMMARIZE_RUN_ON_START", "1").lower() in ("1", "true", "yes")
DEFAULT_TZ = "America/New_York"
DEFAULT_RECAP_HOUR = 23
DEFAULT_RECAP_MINUTE = 0


def _tz() -> ZoneInfo:
    name = (os.getenv("TZ") or DEFAULT_TZ).strip() or DEFAULT_TZ
    return ZoneInfo(name)


def recap_hour_minute() -> tuple[int, int]:
    hour = int(os.getenv("NEWS_RECAP_HOUR", str(DEFAULT_RECAP_HOUR)))
    minute = int(os.getenv("NEWS_RECAP_MINUTE", str(DEFAULT_RECAP_MINUTE)))
    return hour, minute


def next_recap_datetime(
    now: datetime, hour: int | None = None, minute: int | None = None
) -> datetime:
    """Next 23:00 (or hour/minute) strictly after *now* in now's timezone."""
    if now.tzinfo is None:
        now = now.replace(tzinfo=_tz())
    env_h, env_m = recap_hour_minute()
    hour = env_h if hour is None else hour
    minute = env_m if minute is None else minute
    candidate = now.replace(hour=hour, minute=minute, second=0, microsecond=0)
    if now >= candidate:
        candidate += timedelta(days=1)
    return candidate


def next_event(
    now: datetime,
    last_periodic: datetime | None,
    interval_s: int,
    hour: int = DEFAULT_RECAP_HOUR,
    minute: int = DEFAULT_RECAP_MINUTE,
) -> tuple[datetime, str]:
    """Return (when, 'recap'|'interval') for the sooner of recap vs interval."""
    recap_at = next_recap_datetime(now, hour=hour, minute=minute)
    periodic_at = now if last_periodic is None else last_periodic + timedelta(seconds=interval_s)
    if recap_at <= periodic_at:
        return recap_at, "recap"
    return periodic_at, "interval"


def run_summarize(*, recap: bool = False) -> None:
    kind = "recap" if recap else "interval"
    logger.info(
        "%s starting at %s", kind, datetime.now().isoformat(timespec="seconds")
    )
    env = os.environ.copy()
    if recap:
        env["NEWS_RECAP"] = "1"
    else:
        env.pop("NEWS_RECAP", None)
    try:
        proc = subprocess.run(
            [sys.executable, "summarizer.py"], cwd="/app", env=env
        )
        logger.info("%s finished rc=%s", kind, proc.returncode)
    except Exception:  # noqa: BLE001 — keep the loop alive across failures
        logger.exception("%s failed", kind)


def main() -> None:
    if not os.getenv("NOUS_API_KEY", "").strip():
        logger.warning(
            "NOUS_API_KEY unset in env — will read api_keys on each run; idle if both empty"
        )
    tz = _tz()
    hour, minute = recap_hour_minute()
    logger.info(
        "news summarizer loop starting (interval_s=%s, run_on_start=%s, recap=%02d:%02d %s)",
        INTERVAL_S, RUN_ON_START, hour, minute, tz,
    )
    last_periodic: datetime | None = None
    if RUN_ON_START:
        run_summarize(recap=False)
        last_periodic = datetime.now(tz)
    while True:
        now = datetime.now(tz)
        when, kind = next_event(
            now, last_periodic, INTERVAL_S, hour=hour, minute=minute
        )
        sleep_s = max(1, (when - now).total_seconds())
        logger.info("next %s in %ss", kind, int(sleep_s))
        time.sleep(sleep_s)
        now = datetime.now(tz)
        if kind == "recap":
            run_summarize(recap=True)
            # Recap covers the 15-min window; don't immediately fire interval.
            last_periodic = now
        else:
            run_summarize(recap=False)
            last_periodic = now


if __name__ == "__main__":
    sys.exit(main())