events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    # Allow streaming chunk uploads without buffer size limits
    client_max_body_size 50M;

    upstream backend_upstream {
        server backend:8000;
    }

    server {
        listen 80;
        server_name _;

        # Frontend SPA Static Files
        location / {
            root /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }

        # API Reverse Proxy
        location /api/ {
            proxy_pass http://backend_upstream;
            proxy_http_version 1.1;
            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;

            # Direct chunk upload streaming
            proxy_request_buffering off;
            proxy_buffering off;
            proxy_read_timeout 300s;
        }

        # WebSocket Reverse Proxy
        location /ws/ {
            proxy_pass http://backend_upstream;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_set_header Host $host;
            proxy_read_timeout 86400s;
            proxy_send_timeout 86400s;
        }
    }
}