user  nginx;
worker_processes  auto;

error_log  /dev/stderr  warn;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

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

    access_log  /dev/stdout;

    sendfile        on;
    tcp_nopush      on;
    keepalive_timeout  65;
    server_tokens   off;

    # Compression: takes the main JS bundle from ~1.9 MB down to ~530 kB on the wire
    gzip              on;
    gzip_vary         on;
    gzip_proxied      any;
    gzip_comp_level   6;
    gzip_min_length   1024;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/json
        application/xml
        image/svg+xml
        font/woff
        font/woff2;

    server {
        # 80 is the conventional port; 3000 is what Dokploy targets by default in
        # its domain config. Binding both means Traefik reaches the app whichever
        # one the dashboard's Port field is set to, so a deploy can't 502 purely
        # because those two numbers disagree.
        listen 80;
        listen 3000;
        server_name _;

        root  /usr/share/nginx/html;
        index index.html;

        # Container liveness for Dokploy/Docker. Kept above the SPA fallback so it
        # answers with a real status instead of 200-plus-index.html, which would
        # make any health check pass even with the app completely broken.
        location = /health {
            access_log off;
            add_header Content-Type text/plain;
            return 200 "ok\n";
        }

        # Vite writes content-hashed filenames here, so they can be cached forever.
        # Only add_header is used — combining it with `expires` emits two
        # conflicting Cache-Control headers.
        #
        # try_files ending in =404 is deliberate: without it a stale index.html
        # asking for an asset from a previous deploy would fall through to the
        # SPA rule below and receive index.html with a 200 and a text/html type.
        # The browser refuses to execute that as a module and the page renders
        # empty with only a MIME error in the console — a real 404 is far easier
        # to diagnose and lets a reload recover.
        location /assets/ {
            add_header Cache-Control "public, max-age=31536000, immutable";
            access_log off;
            try_files $uri =404;
        }

        # index.html must be revalidated every time or deploys won't take effect
        location = /index.html {
            add_header Cache-Control "no-cache";
        }

        location / {
            # This line forces Nginx to pass routing back to React Router
            try_files $uri $uri/ /index.html;

            # The fallback is served under the requested path, so the `= /index.html`
            # rule above never applies to it. Without this a proxy or browser can
            # cache the old HTML and keep loading assets that no longer exist.
            add_header Cache-Control "no-cache";
        }
    }
}