#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later
# Name: backtunnel-umount
# Summary: Unmount a BackTunnel FUSE mount point using the best available helper.
# Usage:
#   backtunnel-umount <mountpoint>
# Notes:
#   - Prefers fusermount3, then fusermount; falls back to umount.
#   - Expands a leading "~" in the mountpoint.
set -euo pipefail

usage() {
  echo "Usage: $(basename "$0") <mountpoint>" >&2
  exit 1
}

case "${1:-}" in
  -h|--help) usage ;;
esac

MP="${1:-}"
[[ -n "$MP" ]] || usage

# Expand leading ~
if [[ "$MP" == "~"* ]]; then
  MP="${MP/#\~/$HOME}"
fi

if command -v fusermount3 >/dev/null 2>&1; then
  exec fusermount3 -u -- "$MP"
elif command -v fusermount >/dev/null 2>&1; then
  exec fusermount -u -- "$MP"
else
  exec umount -- "$MP"
fi