"""
Art DAG Celery Application

Distributed rendering for the Art DAG system.
Uses the foundational artdag language from GitHub.
"""

import os
from celery import Celery

REDIS_URL = os.environ.get('REDIS_URL', 'redis://localhost:6379/5')

app = Celery(
    'art_celery',
    broker=REDIS_URL,
    backend=REDIS_URL,
    include=['legacy_tasks', 'tasks', 'tasks.analyze', 'tasks.execute', 'tasks.orchestrate']
)

app.conf.update(
    result_expires=86400 * 7,  # 7 days - allow time for recovery after restarts
    task_serializer='json',
    accept_content=['json', 'pickle'],  # pickle needed for internal Celery messages
    result_serializer='json',
    event_serializer='json',
    timezone='UTC',
    enable_utc=True,
    task_track_started=True,
    task_acks_late=True,  # Don't ack until task completes - survives worker restart
    worker_prefetch_multiplier=1,
    task_reject_on_worker_lost=True,  # Re-queue if worker dies
    task_acks_on_failure_or_timeout=True,  # Ack failed tasks so they don't retry forever
)

if __name__ == '__main__':
    app.start()