events {
    worker_connections 1024;
}

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

    sendfile on;

    # ── Gzip compression ──────────────────────────────────────────────────────
    gzip            on;
    gzip_types      text/plain text/css application/javascript application/json;
    gzip_min_length 1000;

    server {
        listen 80;
        server_name _;

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

        # ── Static files ──────────────────────────────────────────────────────
        location / {
            try_files $uri $uri.html $uri/ =404;
        }

        # Cache static assets aggressively and suppress access log noise
        location ~* \.(css|js|svg|ico|png|jpg|webp|woff2?)$ {
            expires 7d;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        # ── API reverse proxy ─────────────────────────────────────────────────
        # All /api/* requests are forwarded to the FastAPI container.
        # The container is reachable by its service name on the Docker network.
        location /api/ {
            proxy_pass         http://api: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;

            # Don't cache API responses
            add_header Cache-Control "no-store";
        }

        # ── Custom error pages ────────────────────────────────────────────────
        error_page 404 /404.html;
        error_page 502 503 504 /50x.html;

        location = /404.html { internal; }
        location = /50x.html { internal; }
    }
}