#!/usr/bin/env bash
# Shelfless installer for a Debian/Ubuntu Proxmox LXC.
# Installs Node, fetches the repo, builds the frontend, and sets up a systemd service
# that serves the app and reverse-proxies to your Audiobookshelf server.
#
# Usage (as root on the container):
#   REPO_URL=https://git.scarriffle.com/<owner>/shelfless.git \
#   ABS_URL=http://127.0.0.1:13378 PORT=8080 \
#   bash install.sh
#
# Re-running updates an existing install.
set -euo pipefail

REPO_URL="${REPO_URL:?Set REPO_URL to your git repo, e.g. https://git.scarriffle.com/owner/shelfless.git}"
INSTALL_DIR="${INSTALL_DIR:-/opt/shelfless}"
ABS_URL="${ABS_URL:-http://127.0.0.1:13378}"
PORT="${PORT:-8080}"
SERVICE="${SERVICE:-shelfless}"

echo "==> Installing system dependencies"
apt-get update -y
apt-get install -y git curl ca-certificates

if ! command -v node >/dev/null 2>&1; then
  echo "==> Installing Node.js 20.x"
  curl -fsSL https://deb.nodesource.com/setup_20.x | bash -
  apt-get install -y nodejs
fi
echo "    node $(node --version), npm $(npm --version)"

echo "==> Fetching source into $INSTALL_DIR"
if [ -d "$INSTALL_DIR/.git" ]; then
  git -C "$INSTALL_DIR" pull --ff-only
else
  git clone "$REPO_URL" "$INSTALL_DIR"
fi

echo "==> Building"
cd "$INSTALL_DIR"
npm ci
npm run build

echo "==> Writing systemd unit /etc/systemd/system/$SERVICE.service"
NODE_BIN="$(command -v node)"
cat > "/etc/systemd/system/$SERVICE.service" <<EOF
[Unit]
Description=Shelfless (Audiobookshelf frontend)
After=network.target

[Service]
Type=simple
WorkingDirectory=$INSTALL_DIR
ExecStart=$NODE_BIN server/index.mjs
Restart=on-failure
RestartSec=3
Environment=NODE_ENV=production
Environment=PORT=$PORT
Environment=ABS_URL=$ABS_URL

[Install]
WantedBy=multi-user.target
EOF

echo "==> Enabling and starting service"
systemctl daemon-reload
systemctl enable --now "$SERVICE"
sleep 1
systemctl --no-pager --full status "$SERVICE" || true

IP="$(hostname -I 2>/dev/null | awk '{print $1}')"
echo ""
echo "Done. Shelfless is running:"
echo "  URL:  http://${IP:-<container-ip>}:$PORT"
echo "  ABS:  $ABS_URL"
echo "  Logs: journalctl -u $SERVICE -f"