server {
    listen 80;
    listen [::]:80;
    # Redirect all HTTP to HTTPS on the same host
    return 308 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    # Catch-all; optionally set a specific server_name
    server_name _;

    ssl_certificate     /etc/nginx/ssl/cert.pem;
    ssl_certificate_key /etc/nginx/ssl/key.pem;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    # Allow larger file uploads (profile pictures, logos, etc.)
    client_max_body_size 10M;

    # Security headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Proxy to application
    location / {
        proxy_pass http://app:8080;
        # Preserve original host including port (e.g., localhost:8443)
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Forwarded-Port $server_port;
        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;

        # Preserve cookies
        proxy_pass_request_headers on;
        proxy_cookie_path / /;
    }

    # Socket.IO (WebSocket) endpoint
    location /socket.io/ {
        proxy_pass http://app:8080/socket.io/;
        # WebSocket upgrade headers
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Preserve original host and client details
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Forwarded-Port $server_port;
        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;

        # Timeouts and buffering suitable for long-lived WS
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
        proxy_buffering off;
    }
}