from celery import Celery
from celery.schedules import timedelta

from web.config import settings

celery_app = Celery("evosync", broker=settings.REDIS_URL, backend=settings.REDIS_URL)

celery_app.conf.update(
    task_serializer="json",
    result_serializer="json",
    accept_content=["json"],
    timezone="Europe/Moscow",
    enable_utc=True,
    task_track_started=True,
    task_acks_late=True,
    worker_prefetch_multiplier=1,
    broker_connection_retry_on_startup=True,
    task_routes={
        "web.tasks.sync.*": {"queue": "sync"},
        "web.tasks.vk_sync.*": {"queue": "sync"},
        "web.tasks.health.*": {"queue": "health"},
        "web.tasks.catalog.*": {"queue": "default"},
        "web.tasks.vk_catalog.*": {"queue": "default"},
        "web.notifications.tasks.*": {"queue": "notifications"},
    },
    beat_schedule={
        # Chain: fetch Evotor → fetch VK catalog → mirror Evotor→VK
        # Beat fires the launcher task which chains all three sequentially.
        "sync-pipeline": {
            "task": "web.tasks.celery_app.run_sync_pipeline",
            "schedule": timedelta(seconds=settings.CATALOG_REFRESH_INTERVAL_SECONDS),
        },
    },
)

# Register task modules so beat/worker can discover them
celery_app.autodiscover_tasks([
    "web.tasks.catalog",
    "web.tasks.vk_catalog",
    "web.tasks.vk_sync",
    "web.tasks.celery_app",
])


@celery_app.task(name="web.tasks.celery_app.run_sync_pipeline", queue="default")
def run_sync_pipeline() -> str:
    """
    Beat entry point. Chains refresh_catalog → refresh_vk_catalog → mirror_to_vk
    so that mirror only runs after both catalog fetches are complete.
    """
    from celery import chain
    from web.tasks.catalog import refresh_catalog
    from web.tasks.vk_catalog import refresh_vk_catalog
    from web.tasks.vk_sync import mirror_to_vk

    chain(
        refresh_catalog.si(),
        refresh_vk_catalog.si(),
        mirror_to_vk.si(),
    ).apply_async()
    return "pipeline dispatched"