from types import SimpleNamespace

from flask import current_app
from redis import Redis
from rq import Queue
from rq.job import JobStatus


ACTIVE_JOB_STATUSES = {JobStatus.QUEUED, JobStatus.STARTED, JobStatus.DEFERRED, JobStatus.SCHEDULED}


def get_task_queue():
    redis_url = current_app.config.get("TASK_QUEUE_REDIS_URL", "")
    if not redis_url:
        raise RuntimeError("Очередь фоновых задач не настроена")
    connection = Redis.from_url(redis_url, socket_connect_timeout=3, socket_timeout=3)
    return Queue("inviteme", connection=connection, default_timeout=3600)


def enqueue_event_invitations(event_id, initiated_by_id):
    if current_app.config.get("TASK_QUEUE_EAGER"):
        from app.tasks import send_event_invitations_in_context
        result = send_event_invitations_in_context(event_id, initiated_by_id)
        return SimpleNamespace(id="eager", result=result), True
    queue = get_task_queue()
    job_id = f"event-invitations-{event_id}"
    existing = queue.fetch_job(job_id)
    if existing and existing.get_status(refresh=True) in ACTIVE_JOB_STATUSES:
        return existing, False
    if existing:
        existing.delete()
    return queue.enqueue(
        "app.tasks.send_event_invitations", event_id, initiated_by_id,
        job_id=job_id, job_timeout=3600, result_ttl=3600, failure_ttl=86400,
    ), True