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

# Usage on offline machine:
#   sudo ./install-offline.sh /path/to/bundle-node-v22.x.y-linux-x64
#
# Optional:
#   INSTALL_PREFIX=/opt/nodejs sudo ./install-offline.sh /path/to/bundle

BUNDLE_DIR="${1:-}"
INSTALL_PREFIX="${INSTALL_PREFIX:-/opt/nodejs}"

if [[ -z "${BUNDLE_DIR}" ]]; then
  echo "Usage: sudo ./install-offline.sh /path/to/bundle-node-v22.x.y-linux-{x64|arm64}"
  exit 1
fi

if [[ ! -d "${BUNDLE_DIR}" ]]; then
  echo "Bundle directory not found: ${BUNDLE_DIR}"
  exit 1
fi

if [[ ! -f "${BUNDLE_DIR}/INSTALL_ARGS.txt" ]]; then
  echo "Missing INSTALL_ARGS.txt in bundle."
  exit 1
fi

# shellcheck disable=SC1091
source "${BUNDLE_DIR}/INSTALL_ARGS.txt"

if [[ -z "${ARCHIVE:-}" || -z "${VERSION:-}" ]]; then
  echo "INSTALL_ARGS.txt is invalid."
  exit 1
fi

if [[ ! -f "${BUNDLE_DIR}/${ARCHIVE}" ]]; then
  echo "Archive not found: ${BUNDLE_DIR}/${ARCHIVE}"
  exit 1
fi

if [[ ! -f "${BUNDLE_DIR}/SHASUMS256.txt" ]]; then
  echo "SHASUMS256.txt not found in bundle."
  exit 1
fi

echo "Verifying checksum..."
(
  cd "${BUNDLE_DIR}"
  sha256sum -c SHASUMS256.txt --ignore-missing | awk "/${ARCHIVE}: OK/"
)

echo "Installing to ${INSTALL_PREFIX}..."
sudo mkdir -p "${INSTALL_PREFIX}"
sudo tar -xJf "${BUNDLE_DIR}/${ARCHIVE}" -C "${INSTALL_PREFIX}"
sudo ln -sfn "${INSTALL_PREFIX}/node-v${VERSION}-linux-${ARCH}" "${INSTALL_PREFIX}/current"

PROFILE_FILE="/etc/profile.d/nodejs.sh"
LINE='export PATH=/opt/nodejs/current/bin:$PATH'

if [[ "${INSTALL_PREFIX}" != "/opt/nodejs" ]]; then
  LINE="export PATH=${INSTALL_PREFIX}/current/bin:\$PATH"
fi

echo "Writing ${PROFILE_FILE}..."
echo "${LINE}" | sudo tee "${PROFILE_FILE}" >/dev/null
sudo chmod 0644 "${PROFILE_FILE}"

echo
echo "Done. Re-login or run:"
echo "  source ${PROFILE_FILE}"
echo "Check:"
echo "  node -v"
echo "  npm -v"