#!/usr/bin/env bash
set -euo pipefail

ROLE="${1:-web}"
shift || true

case "$ROLE" in
  web)
    echo "[entrypoint] Running alembic upgrade head"
    alembic upgrade head
    echo "[entrypoint] Starting hypercorn on :8080"
    # create_app is a factory — the `()` tells hypercorn to call it once
    # and serve the returned Quart (ASGI) app, rather than treating the
    # function itself as the application (which it then mis-invokes as WSGI).
    # Default 4 workers (was 2): each worker is one asyncio loop, and a large
    # file download occupies its worker for the transfer — 2 was too few once the
    # GPU agent + the browser's thumbnail grid hit /images concurrently (they
    # queued behind each other). Env-tunable via HYPERCORN_WORKERS.
    exec hypercorn \
      --bind 0.0.0.0:8080 \
      --workers "${HYPERCORN_WORKERS:-4}" \
      --access-logfile - \
      "backend.app:create_app()"
    ;;

  worker)
    QUEUES="${CELERY_QUEUES:-default,import,thumbnail}"
    CONCURRENCY="${CELERY_CONCURRENCY:-2}"
    echo "[entrypoint] Starting Celery worker queues=$QUEUES concurrency=$CONCURRENCY"
    exec celery -A backend.app.celery_app:celery worker \
      --loglevel=info \
      -Q "$QUEUES" \
      --concurrency="$CONCURRENCY"
    ;;

  scheduler)
    QUEUES="${CELERY_QUEUES:-maintenance,scan}"
    # Honours CELERY_CONCURRENCY like the `worker` role does. It was hardcoded
    # to 1, which was harmless while only compose started this lane and set no
    # concurrency for it — but the generated supervisord config (milestone 422
    # step 5) passes one, and a value silently ignored at boot would leave the
    # lane at 1 until the reconcile sweep noticed, with nothing saying why.
    CONCURRENCY="${CELERY_CONCURRENCY:-1}"
    echo "[entrypoint] Starting Celery beat+worker queues=$QUEUES concurrency=$CONCURRENCY"
    exec celery -A backend.app.celery_app:celery worker \
      --beat \
      --loglevel=info \
      -Q "$QUEUES" \
      --concurrency="$CONCURRENCY"
    ;;

  ml-worker)
    # NO MODEL DOWNLOAD HERE (milestone 422 step 6). This used to run
    # download_models before celery started, which made every boot of this
    # role reach HuggingFace for ~3.5GB. Rule 164 permits a runtime fetch only
    # for a feature that is "optional and clearly off" — so the fetch moved to
    # the moment the operator ENABLES the lane, where it is visible, retryable
    # and attributable, instead of being a silent precondition of starting.
    #
    # The worker therefore starts with no model present, which is correct: it
    # is not consuming the ml queue until the lane is enabled, and enabling it
    # is what enqueues ensure_models.
    QUEUES="${CELERY_QUEUES:-ml}"
    CONCURRENCY="${CELERY_CONCURRENCY:-1}"
    echo "[entrypoint] Starting ML Celery worker queues=$QUEUES concurrency=$CONCURRENCY"
    exec celery -A backend.app.celery_app:celery worker \
      --loglevel=info \
      -Q "$QUEUES" \
      --concurrency="$CONCURRENCY"
    ;;

  all)
    # The single-container layout (milestone 422 step 5): hypercorn plus one
    # celery process per lane, under supervisord, in one container beside
    # Postgres and Redis.
    #
    # The config is GENERATED from services/worker_lanes.LANES rather than
    # checked in, so the processes this container runs and the lanes the
    # application believes in cannot disagree — see the generator's docstring
    # for why a static .conf would have been a fifth copy of the queue names.
    #
    # supervisord is PID 1 here and never reads the database. Every lane boots
    # at its LANES default; the reconcile sweep raises it to whatever the
    # operator stored, within one tick. That ordering is deliberate: settings
    # adjust a baseline that already works, and can never prevent a boot.
    CONF="${SUPERVISOR_CONF:-/tmp/supervisord.conf}"
    echo "[entrypoint] Generating $CONF from the lane table"
    python -m backend.app.scripts.gen_supervisord > "$CONF"
    echo "[entrypoint] Starting supervisord (web + worker lanes)"
    exec supervisord -c "$CONF"
    ;;

  shell|bash)
    exec /bin/bash "$@"
    ;;

  alembic)
    exec alembic "$@"
    ;;

  *)
    echo "[entrypoint] Unknown role: $ROLE" >&2
    echo "[entrypoint] Valid roles: all | web | worker | scheduler | maintenance_long | ml | ml-worker | shell | alembic" >&2
    exit 1
    ;;
esac