#!/usr/bin/env bash
# Adds the duel server to a droplet that setup-droplet.sh already prepared.
# 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: the two proxied paths go in before the static file handling.
if ! grep -q 'reverse_proxy' /etc/caddy/Caddyfile; then
  python3 - <<'PY'
import pathlib
p = pathlib.Path('/etc/caddy/Caddyfile'); s = p.read_text()
marker = 'try_files {path} {path}.html /index.html'
proxy = '''@duel path /api/* /ws
reverse_proxy @duel localhost:8788 {
	lb_try_duration 30s
	lb_try_interval 250ms
}

'''
assert marker in s
p.write_text(s.replace(marker, proxy + marker))
PY
  caddy validate --config /etc/caddy/Caddyfile
  systemctl reload caddy
fi

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