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

: "${RUN_NAME:?RUN_NAME is required}"
: "${OUTPUT_DIR:?OUTPUT_DIR is required}"

EXPECTED_OUTPUT_DIR="/nfs/ywang29/GmNet/runs/e4_alignment/${RUN_NAME}"
if [[ "${RUN_NAME}" != e4a_* ]]; then
  echo "E4 alignment run name must use the e4a_ namespace: ${RUN_NAME}" >&2
  exit 2
fi
if [[ "${OUTPUT_DIR}" != "${EXPECTED_OUTPUT_DIR}" ]]; then
  echo "E4 alignment output mismatch: expected ${EXPECTED_OUTPUT_DIR}, got ${OUTPUT_DIR}" >&2
  exit 2
fi
if ! command -v flock >/dev/null 2>&1; then
  echo "flock is required to prevent concurrent writers" >&2
  exit 1
fi

mkdir -p "${OUTPUT_DIR}"
LOCK_PATH="${OUTPUT_DIR}/.e4_alignment.lock"
exec 9>"${LOCK_PATH}"
if ! flock -n 9; then
  echo "Another process is already writing ${OUTPUT_DIR}" >&2
  exit 73
fi

bash scripts/init_run.sh "$@"