#!/usr/bin/env bash
# Set up nvm and a stable default Node.js for a gitea_runner user on a CI runner.
#
# Usage: ./script/setup/nvm.sh <runner-host>
#
# This script:
#   1. Installs nvm for the gitea_runner user (if not already present)
#   2. Installs the current Node.js LTS version
#   3. Creates a stable symlink at ~/.nvm/default_bin pointing to the
#      default node binary directory
#   4. Prints the systemd Environment line needed for the runner unit
#
# After running, add the following to the runner's systemd unit
# (/etc/systemd/system/gitea-action-runner.service):
#
#   Environment=PATH=/var/lib/gitea_runner/.nvm/default_bin:/usr/local/sbin:/usr/local/bin:/usr/bin
#
# Then: sudo systemctl daemon-reload && sudo systemctl restart gitea-action-runner

set -euo pipefail

runner_host="${1:?usage: $0 <runner-host>}"
runner_user="gitea_runner"

echo "installing nvm on ${runner_host} for ${runner_user}..."
ssh "${runner_host}" "sudo -u ${runner_user} bash -c '
    export NVM_DIR=\"\${HOME}/.nvm\"
    if [ -s \"\${NVM_DIR}/nvm.sh\" ]; then
        echo \"nvm already installed at \${NVM_DIR}\"
    else
        curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
    fi
'"

echo "installing Node.js LTS and creating stable symlink..."
ssh "${runner_host}" "sudo -u ${runner_user} bash -c '
    export NVM_DIR=\"\${HOME}/.nvm\"
    . \"\${NVM_DIR}/nvm.sh\"
    nvm install --lts
    nvm alias default lts/*
    ln -sfn \"\$(dirname \"\$(nvm which default)\")\" \"\${NVM_DIR}/default_bin\"
    echo \"node: \$(node --version)\"
    echo \"symlink: \$(readlink -f \"\${NVM_DIR}/default_bin\")\"
'"

echo ""
echo "add the following to /etc/systemd/system/gitea-action-runner.service on ${runner_host}:"
echo ""
echo "  Environment=PATH=/var/lib/${runner_user}/.nvm/default_bin:/usr/local/sbin:/usr/local/bin:/usr/bin"
echo ""
echo "then run:"
echo "  ssh ${runner_host} 'sudo systemctl daemon-reload && sudo systemctl restart gitea-action-runner'"
echo ""
echo "also add 'nvm' to the runner's labels in /etc/act_runner/config.yml"