_omarchy_mac_boot_asahi_pacsave_notice() {
  local pacsave=/etc/mkinitcpio.conf.d/90-omarchy-asahi.conf.pacsave
  local shipped=/etc/mkinitcpio.conf.d/90-omarchy-mac.conf

  [[ -f $pacsave && -f $shipped ]] || return 0
  cmp -s "$pacsave" "$shipped" && return 0

  cat <<EOF
==> omarchy-mac-boot: a customized 90-omarchy-asahi.conf was preserved as:
      $pacsave
    The active mkinitcpio drop-in is now:
      $shipped
    Merge any remaining local changes into the new file.
EOF
}

_omarchy_mac_boot_migrate_legacy_first_boot() {
  local legacy=/var/lib/omarchy/first-boot/pending
  local successor=/var/lib/omarchy/mac-first-boot/pending

  [[ -e $legacy ]] || return 0
  install -Dm644 /dev/null "$successor"
  rm -f "$legacy"
  systemctl --no-reload enable omarchy-mac-first-boot.service 2>/dev/null || {
    install -d /etc/systemd/system/multi-user.target.wants
    ln -sfr /usr/lib/systemd/system/omarchy-mac-first-boot.service \
      /etc/systemd/system/multi-user.target.wants/omarchy-mac-first-boot.service
  }
}

post_install() {
  _omarchy_mac_boot_asahi_pacsave_notice
  _omarchy_mac_boot_migrate_legacy_first_boot
  _omarchy_mac_boot_drop_legacy_wants
}

_omarchy_mac_boot_drop_legacy_wants() {
  # The replaced omarchy-first-boot left its preset-enabled link behind, and
  # the migration engine this package no longer ships enabled its verifier.
  local unit link
  for unit in omarchy-first-boot.service omarchy-mac-migrate-verify.service; do
    link=/etc/systemd/system/multi-user.target.wants/$unit
    [[ -L $link && ! -e $link ]] && rm -f "$link"
  done
  return 0
}

post_upgrade() {
  _omarchy_mac_boot_asahi_pacsave_notice
  _omarchy_mac_boot_migrate_legacy_first_boot
  _omarchy_mac_boot_drop_legacy_wants
}