automate nginx update

#!/bin/bash

# Exit on error
set -e

# Usage check
if [ "$#" -ne 2 ]; then
    echo "Usage: $0 <old_domain> <new_domain>"
    echo "Example: $0 uchurn.online uchurn.click"
    exit 1
fi

OLD_DOMAIN=$1
NEW_DOMAIN=$2

NGINX_CONF_DIR="/etc/nginx/sites-available"
OLD_CONF_FILE="${NGINX_CONF_DIR}/${OLD_DOMAIN}"
NEW_CONF_FILE="${NGINX_CONF_DIR}/${NEW_DOMAIN}"

# Check old config exists
if [ ! -f "$OLD_CONF_FILE" ]; then
    echo "Error: Nginx config for $OLD_DOMAIN not found in $NGINX_CONF_DIR"
    exit 1
fi

# Backup old config
cp "$OLD_CONF_FILE" "${OLD_CONF_FILE}.bak"

# Replace old domain with new (including subdomains)
sed "s/${OLD_DOMAIN//./\\.}/${NEW_DOMAIN//./\\.}/g" "$OLD_CONF_FILE" > "$NEW_CONF_FILE"

# Enable the new site
ln -sfn "$NEW_CONF_FILE" "/etc/nginx/sites-enabled/${NEW_DOMAIN}"

# Test Nginx config
echo "Testing Nginx configuration..."
nginx -t

# Reload Nginx
echo "Reloading Nginx..."
systemctl reload nginx

echo "✅ Nginx config updated from $OLD_DOMAIN to $NEW_DOMAIN"

# Optional SSL setup
read -p "Do you want to issue a new SSL certificate for $NEW_DOMAIN and its subdomains (like dashboard.$NEW_DOMAIN)? (y/n): " SSL_ISSUE
if [[ "$SSL_ISSUE" == "y" ]]; then
    certbot --nginx -d "$NEW_DOMAIN" -d "dashboard.$NEW_DOMAIN"
    systemctl reload nginx
fi