"""Agent slots for due recurring elements."""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Any

from steering.eval_context import SteeringEvalContext


def _parse_due(value: Any) -> datetime | None:
    if not value:
        return None
    if isinstance(value, datetime):
        return value if value.tzinfo else value.replace(tzinfo=timezone.utc)
    try:
        text = str(value).replace("Z", "+00:00")
        parsed = datetime.fromisoformat(text)
        return parsed if parsed.tzinfo else parsed.replace(tzinfo=timezone.utc)
    except ValueError:
        return None


def resolve_recurring_due_slots(ctx: SteeringEvalContext) -> list[dict[str, Any]]:
    now = datetime.now(timezone.utc)
    slots: list[dict[str, Any]] = []

    for element in ctx.recurring_elements:
        if element.get("status") != "active":
            continue
        due = _parse_due(element.get("next_due_at"))
        if due is None or due > now:
            continue
        slots.append(
            {
                "slot_key": "recurring.due",
                "scope_type": "recurring_element",
                "scope_id": str(element["id"]),
                "title": element.get("title") or "Rhythmus",
                "summary": "Wiederkehrendes Element ist fällig",
                "actor_role_hint": "operator",
                "payload_keys": ["recurring_id", "interval_days"],
                "priority": "normal",
                "recurring_element_id": str(element["id"]),
            }
        )

    return slots