# nginx site for Plenum: static frontend + API reverse proxy.
#
# Substitute __DOMAIN__ and __PROJECT_ROOT__, then place in
# /etc/nginx/sites-available/ and symlink into sites-enabled/.
#
# Obtain the certificate first (certbot --nginx -d __DOMAIN__); the TLS paths
# below assume Let's Encrypt's default layout.

server {
    listen 80;
    listen [::]:80;
    server_name __DOMAIN__;

    # ACME challenges must stay on port 80.
    location /.well-known/acme-challenge/ { root /var/www/html; }
    location / { return 301 https://$host$request_uri; }
}

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

    ssl_certificate     /etc/letsencrypt/live/__DOMAIN__/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/__DOMAIN__/privkey.pem;

    # Chat and research stream over SSE. Buffering would hold events until the
    # response completed, which looks exactly like a hung request to the user.
    location /api/ {
        proxy_pass http://127.0.0.1:8000;
        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;
        proxy_buffering off;
        proxy_cache off;
        # A deep-research turn can legitimately run for minutes.
        proxy_read_timeout 600s;
    }

    root __PROJECT_ROOT__/frontend/dist;
    index index.html;

    # Vite emits content-hashed filenames, so assets are safe to cache forever.
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Single-page app: unknown paths are client-side routes, not 404s.
    location / { try_files $uri $uri/ /index.html; }

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;
}