#!/bin/sh
set -eu

THT_FRONTEND_API_UPSTREAM=${THT_FRONTEND_API_UPSTREAM:-http://core:8787}
if ! /usr/local/bin/validate-frontend-api-upstream "$THT_FRONTEND_API_UPSTREAM"; then
  echo "Invalid THT_FRONTEND_API_UPSTREAM: expected internal http://core:8787" >&2
  exit 2
fi
export THT_FRONTEND_API_UPSTREAM

if ! envsubst '${THT_FRONTEND_API_UPSTREAM}' \
    < /etc/nginx/templates/default.conf.template \
    > /etc/nginx/conf.d/default.conf; then
  echo "Unable to render nginx API upstream configuration" >&2
  exit 2
fi

if [ "$#" -gt 0 ]; then
  exec "$@"
fi

exec nginx -g 'daemon off;'