"""Shared schedule parsing for campaigns and social posts."""

from datetime import datetime

from django.utils import timezone


def parse_scheduled_for(raw: str | None):
    """Parse optional ``datetime-local`` value into an aware datetime."""
    value = (raw or "").strip()
    if not value:
        return None
    try:
        parsed = datetime.fromisoformat(value)
    except ValueError as exc:
        raise ValueError("Invalid schedule datetime.") from exc
    if timezone.is_naive(parsed):
        return timezone.make_aware(parsed, timezone.get_current_timezone())
    return parsed