#!/usr/bin/env bash
# One-time host setup. The host may be shared with the other games of
# Kestrel's Hall; this touches nothing of theirs. Copy it and Caddyfile.tmpl
# to the host and run ON it as root:
#   bash setup-droplet.sh 'wizwar.kestrelsnest.social, wizwar.<host-ip>.sslip.io'
# The argument is Wiz-War's Caddy site address line: one name, or several
# separated by commas. Every name must already resolve to this host.
set -euo pipefail
HOST="${1:?usage: setup-droplet.sh <site address line>}"

apt-get update -q
apt-get install -qy curl git rsync

# Node 22
curl -fsSL https://deb.nodesource.com/setup_22.x | bash -
apt-get install -qy nodejs

# Caddy (auto-HTTPS)
apt-get install -qy debian-keyring debian-archive-keyring apt-transport-https
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' \
  | gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' \
  | tee /etc/apt/sources.list.d/caddy-stable.list
apt-get update -q && apt-get install -qy caddy

# App user + directories
id -u wizwar &>/dev/null || useradd -r -m -d /opt/wizwar-home wizwar
mkdir -p /opt/wizwar /var/lib/wizwar/rooms
chown -R wizwar:wizwar /opt/wizwar /var/lib/wizwar

# Caddy: the host's Caddyfile only gathers each game's site file, so this
# host can be shared with the other games of Kestrel's Hall. A Caddyfile
# that is neither Caddy's stock one nor that is a single-site host from
# before the shared layout: stop rather than overwrite it.
ROOT_CADDY='# Kestrel'"'"'s Hall: every game on this host brings its own site file.
import sites/*.caddy'
mkdir -p /etc/caddy/sites
if ! grep -q '^import sites/\*.caddy' /etc/caddy/Caddyfile 2>/dev/null; then
  if [ -s /etc/caddy/Caddyfile ] && ! grep -q 'root \* /usr/share/caddy' /etc/caddy/Caddyfile; then
    echo "/etc/caddy/Caddyfile holds another site; move it into /etc/caddy/sites/ first" >&2
    exit 1
  fi
  printf '%s\n' "$ROOT_CADDY" > /etc/caddy/Caddyfile
fi
sed "s|__HOST__|$HOST|" "$(dirname "$0")/Caddyfile.tmpl" > /etc/caddy/sites/wizwar.caddy
caddy validate --config /etc/caddy/Caddyfile
# Validation as root touches the access logs; Caddy runs as caddy and must own them.
chown -R caddy:caddy /var/lib/caddy
systemctl reload-or-restart caddy

# Firewall: ssh + web only. The game server binds loopback and is reached
# through Caddy; nothing else should answer the internet.
ufw allow OpenSSH
ufw allow 80/tcp
ufw allow 443/tcp
ufw --force enable

echo "droplet ready — now run deploy.sh from your machine"