server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Hashed Vite assets are immutable; cache them hard.
    location /assets/ {
        add_header Cache-Control "public, max-age=31536000, immutable";
        try_files $uri =404;
    }

    # The HTML entry point must never be cached, or a phone (which offers no
    # easy hard-refresh) keeps loading an old bundle after a deploy. The
    # catch-all serves index.html for client-side routes, so it gets the same
    # no-store header.
    location = /index.html {
        add_header Cache-Control "no-store";
    }

    location / {
        add_header Cache-Control "no-store";
        try_files $uri $uri/ /index.html;
    }

    # WebSocket feed. Kept in its own block so the upgrade headers are only set
    # here, and so the optional API token is injected server-side on the
    # handshake (the browser cannot set headers on a WebSocket).
    location /api/ws {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
        proxy_set_header ${API_TOKEN_HEADER} "${API_TOKEN}";
    }

    location /api/ {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 3600s;
        # Inject the optional API token server-side so the browser never sees it
        # and the WebUI keeps working without any client changes.
        proxy_set_header ${API_TOKEN_HEADER} "${API_TOKEN}";
    }
}