#!/bin/sh
set -e

# Default value for API_SERVER_URL if not provided
API_SERVER_URL=${API_SERVER_URL:-http://api-server:8888/}

# Check if NAMESPACE is set and valid
if [ -n "$NAMESPACE" ]; then
  # Kubernetes namespace validation
  if echo "$NAMESPACE" | grep -Eq '^[a-z0-9]([-a-z0-9]*[a-z0-9])?$' && [ ${#NAMESPACE} -le 63 ]; then
    # Check if API_SERVER_URL is standard FQDN
    if echo "$API_SERVER_URL" | grep -q '\.svc\.freeleaps\.cluster'; then
      # CHeck if is FQDN but not contains namespace
      if ! echo "$API_SERVER_URL" | grep -q "\\.$NAMESPACE\\.svc\\.freeleaps\\.cluster"; then
        API_SERVER_URL=$(echo "$API_SERVER_URL" | sed -E "s/([a-zA-Z0-9-]+)\.svc\.freeleaps\.cluster/\1.$NAMESPACE.svc.freeleaps.cluster/")
      fi
    else
      # If not FQDN, convert to FQDN
      host_part=$(echo "$API_SERVER_URL" | sed -nE 's!^(https?://)([^:/]+)(.*)$!\2!p')
      if [ -n "$host_part" ]; then
        # Replace host name part to FQDN
        API_SERVER_URL=$(echo "$API_SERVER_URL" | sed -E "s!$host_part!$host_part.$NAMESPACE.svc.freeleaps.cluster!")
      fi
    fi
  else
    echo "ERROR: Invalid Namespace '$NAMESPACE', skip FQDN convertion"
  fi
fi

# Replace the environment variable in the nginx config
envsubst '${API_SERVER_URL}' < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf

# Start nginx
exec nginx -g 'daemon off;'