server {
  listen 80;
  server_name _;

  # Resolver — coredns (10.233.0.3 на kubespray-кластерах). nodelocal-dns
  # (169.254.25.10) при первом cold lookup отвечает SERVFAIL, поэтому
  # обращаемся напрямую к ClusterDNS service.
  resolver ${RESOLVER_IP} valid=30s ipv6=off;

  # Real client IP behind ingress-nginx.
  set_real_ip_from 0.0.0.0/0;
  real_ip_header X-Forwarded-For;
  real_ip_recursive on;

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

  # /api/v1/dictionaries/* — все admin endpoints (schema, raw record, mutations) идут
  # на writer. Read-api держит /api/v1/{name}/records/* (другой URL pattern, flatten i18n).
  # Regex-location имеет приоритет над префиксом ниже.
  location ~ ^/api/v1/dictionaries/ {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/version — VersionController в ordinis-rest-api → подключён ТОЛЬКО в
  # writer (см. ordinis-app/pom.xml). Без явного правила generic /api/v1/ ниже
  # роутит GET → read-api → 500 NoResourceFoundException → пустой traceId.
  # Тот же класс баги что для /drafts/me ниже.
  location = /api/v1/version {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/search — SearchController (global trigram-search across all dicts)
  # тоже в ordinis-rest-api → только writer. Без route'а — 500 в Smart Search.
  location ~ ^/api/v1/search(/|$|\?) {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/records/{dict}/{businessKey}/dependents — record-level lineage
  # endpoint в LineageController (ordinis-rest-api → writer). Префикс /records/
  # на root уровне отличается от /api/v1/{dict}/records/* read-api endpoint'а
  # — нужно явное правило, иначе fallback на read-api → 500.
  location ~ ^/api/v1/records/ {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/admin/* — audit + outbox admin endpoints на writer.
  location ~ ^/api/v1/admin/ {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/drafts/* — Approval Workflow v2 endpoints (submit/approve/reject/withdraw)
  # + GET /drafts/me (maker self-tracking) + GET /drafts/{id}. Все живут на writer —
  # read-api не имеет DraftController. Без явного правила GET /drafts/me ловится
  # generic /api/v1/ ниже → read-api → 500 NoResourceFoundException.
  location ~ ^/api/v1/drafts(/|$) {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # /api/v1/me/* — current-user self-scope endpoints (notifications + future
  # preferences). Все на writer (MeNotificationsController в ordinis-rest-api).
  # Тот же шаблон что для /drafts: без явного правила GET → read-api → 500
  # NoResourceFoundException → bell badge на каждой странице бомбит "Внутренняя
  # ошибка сервера". Закрывает observed bug в v2.27.2 (TODO 7).
  location ~ ^/api/v1/me(/|$) {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # Swagger UI + OpenAPI spec на writer (там обвязаны контроллеры).
  location ~ ^/(swagger-ui|v3/api-docs|swagger-resources|webjars/swagger-ui) {
    set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    proxy_pass http://$backend$request_uri;
    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_pass_request_headers on;
  }

  # GET → read-api, мутирующие → writer.
  # FQDN в proxy_pass нужен потому что nginx resolver не использует search list.
  # Namespace и cluster-domain инжектятся через ENV (см. admin-ui Deployment).
  location /api/v1/ {
    set $backend "ordinis-read-api.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    if ($request_method ~ ^(POST|PUT|PATCH|DELETE)$) {
      set $backend "ordinis-app.${ORDINIS_NAMESPACE}.svc.${CLUSTER_DOMAIN}";
    }
    proxy_pass http://$backend;
    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_pass_request_headers on;
  }

  # SPA history fallback.
  location / {
    try_files $uri $uri/ /index.html;
  }
}