"""Celery application configuration for Nexus POS background tasks."""

import os
from celery import Celery

REDIS_URL = os.environ.get('REDIS_URL', 'redis://localhost:6379/0')
# Use Redis DB 1 for Celery to avoid clashing with app cache (DB 0)
BROKER_URL = os.environ.get('CELERY_BROKER_URL', REDIS_URL.replace('/0', '/1'))
BACKEND_URL = os.environ.get('CELERY_RESULT_BACKEND', REDIS_URL.replace('/0', '/1'))

celery = Celery(
    'nexus',
    broker=BROKER_URL,
    backend=BACKEND_URL,
    include=['tasks'],
)

celery.conf.update(
    task_serializer='json',
    accept_content=['json'],
    result_serializer='json',
    timezone='America/Mexico_City',
    enable_utc=True,
    task_track_started=True,
    task_time_limit=3600,      # 1 hour hard limit
    task_soft_time_limit=3300, # 55 min soft limit
    worker_prefetch_multiplier=1,
    result_expires=86400,      # Results expire after 24h
)