#!/usr/bin/env bash
# Adds the duel server to a droplet that setup-droplet.sh already prepared.
# Copy this script and Caddyfile.tmpl to the droplet and run ON the droplet
# as root; safe to run again. Installs Node 22, creates the service user and
# data directory, and teaches Caddy to hand /api and /ws to the server while
# it keeps serving the static site itself.
set -euo pipefail

if ! command -v node >/dev/null || [[ "$(node -v)" != v22* ]]; then
  curl -fsSL https://deb.nodesource.com/setup_22.x | bash -
  apt-get install -qy nodejs
fi

id -u waving-hands &>/dev/null || useradd -r -m -d /opt/waving-hands-home waving-hands
mkdir -p /opt/waving-hands/app /var/lib/waving-hands/rooms
chown -R waving-hands:waving-hands /var/lib/waving-hands

# Caddy: rewrite the site's configuration from the template, keeping its
# address line, so the duel server's paths are routed before the files.
HOST_LINE=$(head -1 /etc/caddy/Caddyfile)
sed "s|__HOST__|$HOST_LINE|" "$(dirname "$0")/Caddyfile.tmpl" > /etc/caddy/Caddyfile
caddy validate --config /etc/caddy/Caddyfile
systemctl reload caddy

echo "server prerequisites ready: now run deploy/deploy.sh <ip> from your machine"