#!/usr/bin/env bash
# 003-purge-exim4 - Remove default local mail server (~21MB)
# Unnecessary if local mail (e.g. cron output) is not used.
# Down reinstalls with Debian defaults (local delivery only).
set -euo pipefail

export DEBIAN_FRONTEND=noninteractive

case "${1:-}" in
  up)   systemctl disable --now exim4.service 2>/dev/null || true
        apt-get purge -y exim4-daemon-light >/dev/null
        apt-get autoremove --purge -y >/dev/null
        echo "    exim4 stopped + package purged + deps cleaned" ;;
  status)
        if dpkg-query -W -f='${db:Status-Abbrev}' exim4-daemon-light 2>/dev/null | grep -q '^ii'; then
          echo "DRIFT exim4-daemon-light is installed"
          exit 1
        fi
        echo "OK exim4-daemon-light not installed" ;;
  down) apt-get update -qq
        apt-get install -y exim4-daemon-light >/dev/null
        systemctl enable --now exim4.service
        echo "    exim4 reinstalled + restarted (default config)" ;;
esac