"""Event publishing.

GCP: publish a JSON message to Pub/Sub; an Argo Events sensor turns it into an Argo Workflow.
Local: run Nextflow directly in a background task so `docker compose up` gives a working demo.
"""
import asyncio
import json
import uuid

from app.config import settings


async def publish_vcf_uploaded(job_id: uuid.UUID, vcf_uri: str) -> None:
    message = {"job_id": str(job_id), "vcf_uri": vcf_uri}
    if settings.pubsub_topic:
        from google.cloud import pubsub_v1  # optional dependency, installed in the GCP image

        publisher = pubsub_v1.PublisherClient()
        publisher.publish(settings.pubsub_topic, json.dumps(message).encode())
        return

    cmd = [
        "nextflow", "run", "/pipeline/main.nf", "-profile", "docker",
        "--vcf", vcf_uri, "--job_id", str(job_id), "--db_url", settings.database_url,
    ]
    try:
        await asyncio.create_subprocess_exec(*cmd)
    except FileNotFoundError:
        # Nextflow is not installed in this environment (no Java toolchain yet);
        # leave the job queued instead of crashing the request.
        print(f"[rarelens] nextflow not found; cannot start pipeline for job {job_id}", flush=True)