#!/usr/bin/env bash
# scripts/server-setup.sh
# One-time setup for a direct Node.js deployment (no Docker).
# Run this once on the server as root or with sudo.
# Usage: bash scripts/server-setup.sh [install-dir]
#
# Installs: Node.js 18, PM2, creates app directory and data dirs.

set -euo pipefail

INSTALL_DIR="${1:-/opt/bill-tracker}"
DATA_DIR="${INSTALL_DIR}/data"
APP_USER="${APP_USER:-www-data}"

echo "=== Bill Tracker — Server Setup ==="
echo "Install dir : $INSTALL_DIR"
echo "Data dir    : $DATA_DIR"
echo "App user    : $APP_USER"
echo ""

# ── Node.js 18 ─────────────────────────────────────────────────────────────────
if ! command -v node &>/dev/null || [[ "$(node -e 'console.log(process.version.split(".")[0].slice(1))')" -lt 18 ]]; then
  echo "→ Installing Node.js 18..."
  if command -v apt-get &>/dev/null; then
    curl -fsSL https://deb.nodesource.com/setup_18.x | bash -
    apt-get install -y nodejs
  elif command -v dnf &>/dev/null; then
    curl -fsSL https://rpm.nodesource.com/setup_18.x | bash -
    dnf install -y nodejs
  else
    echo "ERROR: Unsupported package manager. Install Node.js 18 manually."
    exit 1
  fi
else
  echo "✓ Node.js $(node --version) already installed"
fi

# ── PM2 ────────────────────────────────────────────────────────────────────────
if ! command -v pm2 &>/dev/null; then
  echo "→ Installing PM2..."
  npm install -g pm2
else
  echo "✓ PM2 already installed"
fi

# ── App and data directories ───────────────────────────────────────────────────
echo "→ Creating directories..."
mkdir -p "$INSTALL_DIR" "$DATA_DIR/db" "$DATA_DIR/backups"

if id "$APP_USER" &>/dev/null; then
  chown -R "$APP_USER:$APP_USER" "$INSTALL_DIR"
fi

# ── PM2 startup (survives reboots) ────────────────────────────────────────────
echo "→ Configuring PM2 startup..."
pm2 startup systemd -u "$APP_USER" --hp "/home/$APP_USER" 2>/dev/null || \
  echo "  (Run the 'pm2 startup' command shown above as root to enable auto-start)"

echo ""
echo "=== Setup complete ==="
echo ""
echo "Next steps:"
echo "  1. rsync the project:  ./deploy.sh user@$(hostname) $INSTALL_DIR"
echo "  2. On the server, create $INSTALL_DIR/.env from .env.example"
echo "  3. PM2 will start the app automatically after rsync"