# Serves the built SPA and proxies /api to the backend in the same container.
# Rendered by the nginx image's envsubst step into /etc/nginx/conf.d/default.conf.

server {
    listen 80;
    server_name _;

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

    # The SPA handles the API itself; don't announce the server version.
    server_tokens off;

    # SPA fallback: unknown paths render the app, so client-side routes like
    # /rooms/daily-standup work on refresh and deep links.
    location / {
        try_files $uri $uri/ /index.html;
    }

    location = /index.html {
        add_header Cache-Control "no-store";
    }

    # Proxy the API to the Go backend running alongside nginx.
    #
    # This nginx normally sits behind a parent (SSL-terminating) proxy, so the
    # parent has already resolved the real client IP into X-Forwarded-For.
    # Appending with $proxy_add_x_forwarded_for preserves that first entry, which
    # is what the backend reads (auth.ExtractIP uses the leftmost value).
    # Do NOT use $remote_addr here: it would replace the parent's header with the
    # parent's own address (e.g. the Docker bridge gateway 172.20.0.1).
    location /api/ {
        proxy_pass http://${BACKEND_HOST}:${BACKEND_PORT};
        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;
    }
}