from celery import Celery
from celery.schedules import crontab
from kombu import Queue

from app.config import settings

celery_app = Celery(
    "pocketveto",
    broker=settings.REDIS_URL,
    backend=settings.REDIS_URL,
    include=[
        "app.workers.congress_poller",
        "app.workers.document_fetcher",
        "app.workers.llm_processor",
        "app.workers.news_fetcher",
        "app.workers.trend_scorer",
        "app.workers.member_interest",
    ],
)

celery_app.conf.update(
    task_serializer="json",
    result_serializer="json",
    accept_content=["json"],
    timezone="UTC",
    enable_utc=True,
    # Late ack: task is only removed from queue after completion, not on pickup.
    # Combined with idempotent tasks, this ensures no work is lost if a worker crashes.
    task_acks_late=True,
    # Prevent workers from prefetching LLM tasks and blocking other workers.
    worker_prefetch_multiplier=1,
    # Route tasks to named queues
    task_routes={
        "app.workers.congress_poller.*": {"queue": "polling"},
        "app.workers.document_fetcher.*": {"queue": "documents"},
        "app.workers.llm_processor.*": {"queue": "llm"},
        "app.workers.news_fetcher.*": {"queue": "news"},
        "app.workers.trend_scorer.*": {"queue": "news"},
        "app.workers.member_interest.*": {"queue": "news"},
    },
    task_queues=[
        Queue("polling"),
        Queue("documents"),
        Queue("llm"),
        Queue("news"),
    ],
    # RedBeat stores schedule in Redis — restart-safe and dynamically updatable
    redbeat_redis_url=settings.REDIS_URL,
    beat_scheduler="redbeat.RedBeatScheduler",
    beat_schedule={
        "poll-congress-bills": {
            "task": "app.workers.congress_poller.poll_congress_bills",
            "schedule": crontab(minute=f"*/{settings.CONGRESS_POLL_INTERVAL_MINUTES}"),
        },
        "fetch-news-active-bills": {
            "task": "app.workers.news_fetcher.fetch_news_for_active_bills",
            "schedule": crontab(hour="*/6", minute=0),
        },
        "calculate-trend-scores": {
            "task": "app.workers.trend_scorer.calculate_all_trend_scores",
            "schedule": crontab(hour=2, minute=0),
        },
        "fetch-news-active-members": {
            "task": "app.workers.member_interest.fetch_news_for_active_members",
            "schedule": crontab(hour="*/12", minute=30),
        },
        "calculate-member-trend-scores": {
            "task": "app.workers.member_interest.calculate_all_member_trend_scores",
            "schedule": crontab(hour=3, minute=0),
        },
    },
)