#!/bin/sh
set -eu

CONF=/etc/nginx/conf.d/default.conf
# A 站已有公网域名时走公网更稳；也可设为集群内 http://service.ns.svc:port
A_UPSTREAM="${A_UPSTREAM:-https://project57.website-build.org}"
A_UPSTREAM="${A_UPSTREAM%/}"

# 从 URL 提取 Host，供反代 Host / SNI（Cloudflare/Ingress 依赖正确 Host）
A_HOST="$(printf '%s' "${A_UPSTREAM}" | sed -E 's|^[a-zA-Z][a-zA-Z0-9+.-]*://||; s|[:/].*$||')"
if [ -z "${A_HOST}" ]; then
  A_HOST=project57.website-build.org
fi

NS="$(awk '/^nameserver/{print $2; exit}' /etc/resolv.conf || true)"
if [ -z "${NS}" ]; then
  NS=kube-dns.kube-system.svc.cluster.local
fi

sed -i \
  -e "s|__RESOLVER__|${NS}|g" \
  -e "s|__A_UPSTREAM__|${A_UPSTREAM}|g" \
  -e "s|__A_HOST__|${A_HOST}|g" \
  "${CONF}"

echo "nginx upstream: ${A_UPSTREAM} (Host ${A_HOST}, resolver ${NS})"
nginx -t