"""Celery application configuration."""

from celery import Celery
from celery.schedules import crontab

from app.config import get_settings

settings = get_settings()

celery_app = Celery(
    "gallery_subscriber",
    broker=settings.redis_url,
    backend=settings.redis_url,
    include=["app.tasks.downloads", "app.tasks.maintenance"],
)

# Celery configuration
celery_app.conf.update(
    task_serializer="json",
    accept_content=["json"],
    result_serializer="json",
    timezone="UTC",
    enable_utc=True,
    task_track_started=True,
    task_time_limit=3600,  # 1 hour max per task
    worker_prefetch_multiplier=1,  # Process one task at a time
    worker_concurrency=settings.download_parallel_limit,
)

# Celery Beat schedule for periodic tasks
# Note: The scheduler runs frequently (every 60s) but only triggers downloads
# for sources whose individual check_interval has elapsed. Per-source intervals
# are stored in the database and can be configured via the UI.
celery_app.conf.beat_schedule = {
    "check-sources-scheduler": {
        "task": "app.tasks.downloads.scheduled_check",
        "schedule": 60,  # Run every 60 seconds to check for due sources
    },
    "cleanup-old-downloads-daily": {
        "task": "app.tasks.downloads.cleanup_old_downloads",
        "schedule": crontab(hour=3, minute=0),  # Daily at 3 AM
    },
    "update-storage-stats": {
        "task": "tasks.update_storage_stats",
        "schedule": crontab(minute="*/30"),  # Every 30 minutes
    },
}