server {
  listen 80;
  server_name _;
  root /var/lib/nginx/html;
  index index.html;

  location /api/ {
    proxy_pass http://zeavis-api:3000/api/;
    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;
  }

  # Expose API metrics through the web endpoint (Prometheus scrape target)
  location /metrics {
    proxy_pass http://zeavis-api:3000/metrics;
    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;
  }

  # ── Telemetry Dashboard Proxy (orange VPS via Tailscale) ──────────────
  # Telemetry UI SPA assets (fingerprinted by Vite, cache aggressively)
  location /telemetry/assets/ {
    proxy_pass http://100.96.248.86:8181/assets/;
    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;
    expires 1y;
    add_header Cache-Control "public, immutable";
  }

  # Telemetry API calls (query proxy + target management)
  location /telemetry/proxy/ {
    proxy_pass http://100.96.248.86:8181/proxy/;
    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_connect_timeout 5s;
    proxy_send_timeout 35s;
    proxy_read_timeout 35s;
  }

  location /telemetry/api/ {
    proxy_pass http://100.96.248.86:8181/api/;
    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_connect_timeout 5s;
    proxy_send_timeout 10s;
    proxy_read_timeout 10s;
  }

  # Telemetry SPA — proxy to orange VPS, rewrite root-relative paths to /telemetry/ prefix
  location /telemetry/ {
    proxy_pass http://100.96.248.86:8181/;
    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_connect_timeout 5s;
    proxy_send_timeout 35s;
    proxy_read_timeout 35s;

    # Rewrite root-relative paths (<script src="/", href="/", fetch("/")) to /telemetry/ prefix
    sub_filter_once off;
    sub_filter 'src="/' 'src="/telemetry/';
    sub_filter 'href="/' 'href="/telemetry/';
    sub_filter "url('/" "url('/telemetry/";
    sub_filter 'fetch("/' "fetch(\"/telemetry/";
  }

  location / {
    try_files $uri $uri/ /index.html;
  }
}