server {
    listen 80;
    server_name mnemo-cards.online;

    # Redirect HTTP to HTTPS
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl http2;
    server_name mnemo-cards.online;

    # SSL configuration - Let's Encrypt (preferred)
    ssl_certificate /etc/letsencrypt/live/mnemo-cards.online/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/mnemo-cards.online/privkey.pem;

    # Fallback to self-signed certificates if Let's Encrypt fails
    # ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
    # ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    
    # Client upload size limit (for large file uploads)
    client_max_body_size 100M;
    
    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval'" always;
    
    # Root directory
    root /var/www/mnemo_cards;
    index index.html;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml+rss application/javascript;
    
    # Main location block
    location / {
        try_files $uri $uri/ /index.html;
        
        # Cache static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }
    
    # Handle Flutter web assets
    location ~* \.(wasm|js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        # Removed COEP/COOP headers that interfere with CORS requests to API
        # add_header Cross-Origin-Embedder-Policy "require-corp";
        # add_header Cross-Origin-Opener-Policy "same-origin";
    }
    
    # Security - deny access to hidden files
    location ~ /\. {
        deny all;
    }
}