"""Derive schedule risk signals from entries + daily check-ins.

Shared by human plan routes and agent context — server-owned, not LLM.
"""

from __future__ import annotations

from datetime import date, datetime, timedelta, timezone
from typing import Any

RISK_TAGS = frozenset(
    {
        "urge",
        "court",
        "comparison",
        "corn",
        "daydream",
        "bully",
        "family",
        "shame",
        "rerun",
    }
)

LAST_HOUR_HIGH_TAGS = frozenset({"urge", "court", "corn", "rerun"})


def risk_from_stores(
    entry_store: Any,
    daily_store: Any,
    *,
    now: datetime | None = None,
    target_day: date | None = None,
) -> dict[str, Any]:
    """Return risk_1h, triggers_yesterday, and last_hour_high flags."""

    now = now or datetime.now(timezone.utc)
    target = target_day or now.date()
    hour_ago = now - timedelta(hours=1)
    yesterday = (target - timedelta(days=1)).isoformat()

    tags_1h: list[str] = []
    triggers_y: list[str] = []
    for entry in entry_store._load():
        ts = entry.ts
        if ts.tzinfo is None:
            ts = ts.replace(tzinfo=timezone.utc)
        entry_tags = set(entry.tags) | set(entry.emotions)
        hit = sorted(entry_tags & RISK_TAGS)
        if ts >= hour_ago:
            tags_1h.extend(hit)
        if entry.ts.date().isoformat() == yesterday:
            triggers_y.extend(hit)

    y_daily = daily_store.get(date.fromisoformat(yesterday))
    if y_daily:
        if y_daily.court == "court":
            triggers_y.append("court")
        if y_daily.corn_sessions >= 2:
            triggers_y.append("corn")
        if y_daily.daydream == "fc":
            triggers_y.append("daydream")

    tags_1h = sorted(set(tags_1h))
    triggers_y = sorted(set(triggers_y))
    last_hour_high = bool(LAST_HOUR_HIGH_TAGS & set(tags_1h))
    return {
        "risk_1h_score": float(len(tags_1h)),
        "risk_1h_tags": tags_1h,
        "triggers_yesterday": triggers_y,
        "yesterday_trigger": len(triggers_y) > 0,
        "last_hour_high": last_hour_high,
    }