# Nginx Configuration for StarPunk
# Alternative to Caddy for reverse proxy
#
# Installation:
#   1. Install Nginx: sudo apt install nginx
#   2. Install Certbot: sudo apt install certbot python3-certbot-nginx
#   3. Copy this file: sudo cp nginx.conf.example /etc/nginx/sites-available/starpunk
#   4. Update your-domain.com to your actual domain
#   5. Create symlink: sudo ln -s /etc/nginx/sites-available/starpunk /etc/nginx/sites-enabled/
#   6. Test config: sudo nginx -t
#   7. Get SSL cert: sudo certbot --nginx -d your-domain.com
#   8. Reload: sudo systemctl reload nginx

# Upstream definition for StarPunk container
upstream starpunk {
    server localhost:8000;
    keepalive 32;
}

# HTTP server - redirect to HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name your-domain.com;

    # ACME challenge for Let's Encrypt
    location /.well-known/acme-challenge/ {
        root /var/www/html;
    }

    # Redirect all other HTTP to HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name your-domain.com;

    # SSL certificates (managed by certbot)
    # Update paths after running certbot
    ssl_certificate /etc/letsencrypt/live/your-domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/your-domain.com/privkey.pem;

    # SSL configuration (Mozilla Intermediate)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    # SSL session cache
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;
    ssl_session_tickets off;

    # OCSP stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /etc/letsencrypt/live/your-domain.com/chain.pem;

    # Security headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-ancestors 'none';" always;

    # Logging
    access_log /var/log/nginx/starpunk-access.log;
    error_log /var/log/nginx/starpunk-error.log;

    # Max upload size (for future media uploads)
    client_max_body_size 10M;

    # Root location - proxy to StarPunk
    location / {
        # Proxy to upstream
        proxy_pass http://starpunk;

        # Proxy headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;

        # WebSocket support (for future features)
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Timeouts
        proxy_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;

        # Buffering
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
        proxy_busy_buffers_size 8k;

        # No caching for dynamic content
        add_header Cache-Control "no-cache, private" always;
    }

    # Static files - aggressive caching
    location /static/ {
        proxy_pass http://starpunk;
        proxy_set_header Host $host;

        # Long-term caching for static assets
        add_header Cache-Control "public, max-age=31536000, immutable";

        # Compression
        gzip on;
        gzip_vary on;
        gzip_types text/css application/javascript image/svg+xml;
    }

    # RSS feed - short-term caching
    location /feed.xml {
        proxy_pass http://starpunk;
        proxy_set_header Host $host;

        # Cache for 5 minutes
        add_header Cache-Control "public, max-age=300";

        # Compression
        gzip on;
        gzip_types application/rss+xml application/xml;
    }

    # Health check endpoint - no caching
    location /health {
        proxy_pass http://starpunk;
        proxy_set_header Host $host;

        # No caching
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;

        # Allow monitoring systems access
        # Optional: restrict to specific IPs
        # allow 10.0.0.0/8;  # Internal network
        # deny all;
    }

    # Admin routes - no caching, security
    location /admin/ {
        proxy_pass http://starpunk;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # No caching for admin
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;

        # Optional: IP whitelist for admin
        # allow 1.2.3.4;  # Your IP
        # deny all;
    }

    # Deny access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
}

# Optional: Redirect www to non-www
# server {
#     listen 80;
#     listen [::]:80;
#     listen 443 ssl http2;
#     listen [::]:443 ssl http2;
#     server_name www.your-domain.com;
#
#     ssl_certificate /etc/letsencrypt/live/your-domain.com/fullchain.pem;
#     ssl_certificate_key /etc/letsencrypt/live/your-domain.com/privkey.pem;
#
#     return 301 https://your-domain.com$request_uri;
# }