from __future__ import annotations

from django.conf import settings
from django.core.checks import Warning, register


@register()
def yksa_settings_declared(app_configs, **kwargs):
    if getattr(settings, "YKSA_SERVICE", None):
        return []
    return [
        Warning(
            "YKSA_SERVICE is not set; cache keys fall back to the 'yksa' namespace.",
            hint="Set YKSA_SERVICE to this service's slug in settings/base.py.",
            id="yksa_kit.W001",
        )
    ]