#!/usr/bin/env bash
set -Eeuo pipefail
IFS=$'\n\t'

log() { printf '%s\n' "$*"; }
log_err() { printf 'ERR: %s\n' "$*" >&2; }

usage() {
  cat <<'USG'
Usage: mount_brain.sh [VOLUME_NAME]
Default VOLUME_NAME: Brain
Attempts: diskutil mount by name, then best-effort by scanning identifiers.
Idempotent: no-op if already mounted at /Volumes/<name>.
USG
}

NAME=${1:-Brain}
MOUNTPOINT="/Volumes/${NAME}"

if [[ -d "$MOUNTPOINT" && -e "$MOUNTPOINT" ]]; then
  log "Volume already mounted: $MOUNTPOINT"
  exit 0
fi

if diskutil list | grep -q "[[:space:]]${NAME}[[:space:]]*$"; then
  if diskutil mount "$NAME" >/dev/null 2>&1; then
    log "Mounted by name: $NAME"
    exit 0
  fi
fi

# Fallback: try to locate an APFS Volume with this name and mount its device
IDENT=$(diskutil list | awk -v n="$NAME" 'toupper($0) ~ toupper(n) && $0 ~ /APFS|HFS|Volume/ {dev=$NF} END{print dev}')
if [[ -n "${IDENT}" ]]; then
  if diskutil mount "/dev/${IDENT}" >/dev/null 2>&1; then
    log "Mounted by identifier: /dev/${IDENT}"
    exit 0
  fi
fi

log_err "Unable to mount volume: ${NAME}"
exit 1