"""注册抓取链常驻保活的 beat 周期任务。

apps.resm.tasks.ensure_fetch_running 每 60 秒检查各自触发抓取链的 alive 心跳,
链已死(重启/崩溃/空闲过期)且未被手动停止时重新点火, 保证重启后自愈。
update_or_create / get_or_create 保证迁移可安全重跑。
"""
from django.db import migrations

ENSURE_TASK = "apps.resm.tasks.ensure_fetch_running"
ENSURE_NAME = "resm: 抓取链常驻保活(beat 点火)"


def seed(apps, schema_editor):
    IntervalSchedule = apps.get_model("django_celery_beat", "IntervalSchedule")
    PeriodicTask = apps.get_model("django_celery_beat", "PeriodicTask")
    sched, _ = IntervalSchedule.objects.get_or_create(every=60, period="seconds")
    PeriodicTask.objects.update_or_create(
        name=ENSURE_NAME,
        defaults={
            "task": ENSURE_TASK,
            "interval": sched,
            "crontab": None,
            "enabled": True,
            "description": "每 60 秒检查抓取自触发链 alive 心跳, 链已死且未手动停止则重新点火, 保证重启自愈",
        },
    )


def unseed(apps, schema_editor):
    PeriodicTask = apps.get_model("django_celery_beat", "PeriodicTask")
    PeriodicTask.objects.filter(name=ENSURE_NAME).delete()


class Migration(migrations.Migration):

    dependencies = [
        ("resm", "0009_seed_monitors_and_schedule"),
        ("django_celery_beat", "__latest__"),
    ]

    operations = [
        migrations.RunPython(seed, unseed),
    ]