advanced.func

#!/usr/bin/env bash
# Copyright (c) 2021-2026 community-scripts ORG
# License: MIT | https://raw.githubusercontent.com/community-scripts/core/main/LICENSE

# ==============================================================================
# BUILD-UI/ADVANCED.FUNC - ADVANCED INTERACTIVE CONFIGURATION
# ==============================================================================
# Part of the build UI. Load ui/build-ui.func -- it sources every part --
# rather than this file directly; the split is for maintenance only and no
# function name or behaviour changed with it.
# ==============================================================================

[[ -n "${_BUILD_UI_ADVANCED_LOADED:-}" ]] && return 0
_BUILD_UI_ADVANCED_LOADED=1

# ==============================================================================
# SECTION 6: ADVANCED INTERACTIVE CONFIGURATION
# ==============================================================================

# ------------------------------------------------------------------------------
# advanced_settings()
#
# - Interactive wizard-style configuration with BACK navigation
# - State-machine approach: each step can go forward or backward
# - Cancel at Step 1 = Exit Script, Cancel at other steps = Go Back
# - Allows user to customize all container settings
# ------------------------------------------------------------------------------
advanced_settings() {
  # Enter alternate screen buffer to prevent flicker between dialogs
  tput smcup 2>/dev/null || true
  trap 'tput rmcup 2>/dev/null || true' RETURN

  # Initialize defaults
  if [[ "${var_tags:-}" == *community-script* ]]; then
    TAGS="${var_tags:-community-script}"
  else
    TAGS="community-script${var_tags:+;${var_tags}}"
  fi
  local STEP=1
  local MAX_STEP=31

  # Store values for back navigation - inherit from var_* app defaults
  local _ct_type="${var_unprivileged:-1}"
  local _pw=""
  local _pw_display="Automatic Login"
  # base_settings ran first and checked it; NEXTID can be taken by a leftover disk.
  local _ct_id="${CT_ID:-$NEXTID}"
  local _hostname="$NSAPP"
  local _disk_size="${var_disk:-4}"
  local _core_count="${var_cpu:-1}"
  local _ram_size="${var_ram:-1024}"
  local _bridge="${var_brg:-vmbr0}"
  local _sdn_vnet="${var_sdn_vnet:-}"
  local _net="${var_net:-dhcp}"
  local _gate="${var_gateway:-}"
  local _ipv6_method="${var_ipv6_method:-auto}"
  local _ipv6_addr=""
  local _ipv6_gate=""
  local _apt_cacher="${var_apt_cacher:-no}"
  local _apt_cacher_ip="${var_apt_cacher_ip:-}"
  local _http_proxy="${HTTP_PROXY:-${var_http_proxy:-}}"
  local _http_no_proxy="${HTTP_NO_PROXY:-${var_http_no_proxy:-}}"
  local _inherit_host_ca="${INHERIT_HOST_CA:-${var_inherit_host_ca:-no}}"
  local _mtu="${var_mtu:-}"
  local _sd="${var_searchdomain:-}"
  local _ns="${var_ns:-}"
  local _mac="${var_mac:-}"
  local _vlan="${var_vlan:-}"
  local _tags="$TAGS"
  local _enable_fuse="${var_fuse:-no}"
  local _enable_tun="${var_tun:-no}"
  local _enable_gpu="${var_gpu:-no}"
  local _enable_nesting="${var_nesting:-1}"
  local _verbose="${var_verbose:-no}"
  local _enable_keyctl="${var_keyctl:-0}"
  local _enable_mknod="${var_mknod:-0}"
  local _mount_fs="${var_mount_fs:-}"
  local _protect_ct="${var_protection:-no}"
  local _post_install="${var_post_install:-}"

  # Detect host timezone for default (if not set via var_timezone)
  local _host_timezone=""
  if command -v timedatectl >/dev/null 2>&1; then
    _host_timezone=$(timedatectl show --value --property=Timezone 2>/dev/null || echo "")
  elif [ -f /etc/timezone ]; then
    _host_timezone=$(cat /etc/timezone 2>/dev/null || echo "")
  fi
  # Map Etc/* timezones to "host" (pct doesn't accept Etc/* zones)
  [[ "${_host_timezone:-}" == Etc/* ]] && _host_timezone="host"
  local _ct_timezone="${var_timezone:-$_host_timezone}"
  [[ "${_ct_timezone:-}" == Etc/* ]] && _ct_timezone="host"

  # Helper to show current progress
  show_progress() {
    local current=$1
    local total=$MAX_STEP
    echo -e "\n${INFO}${BOLD}${DGN}Step $current of $total${CL}"
  }

  # Detect available bridges (do this once)
  local BRIDGES=""
  local BRIDGE_MENU_OPTIONS=()
  if declare -f populate_advanced_bridge_menu &>/dev/null; then
    populate_advanced_bridge_menu
  else
  _detect_bridges() {
    IFACE_FILEPATH_LIST="/etc/network/interfaces"$'\n'$(find "/etc/network/interfaces.d/" -type f 2>/dev/null)
    BRIDGES=""
    local OLD_IFS=$IFS
    IFS=$'\n'
    for iface_filepath in ${IFACE_FILEPATH_LIST}; do
      local iface_indexes_tmpfile=$(mktemp -q -u '.iface-XXXX')
      (grep -Pn '^\s*iface' "${iface_filepath}" 2>/dev/null | cut -d':' -f1 && wc -l "${iface_filepath}" 2>/dev/null | cut -d' ' -f1) | awk 'FNR==1 {line=$0; next} {print line":"$0-1; line=$0}' >"${iface_indexes_tmpfile}" 2>/dev/null || true
      if [ -f "${iface_indexes_tmpfile}" ]; then
        while read -r pair; do
          local start=$(echo "${pair}" | cut -d':' -f1)
          local end=$(echo "${pair}" | cut -d':' -f2)
          if awk "NR >= ${start} && NR <= ${end}" "${iface_filepath}" 2>/dev/null | grep -qP '^\s*(bridge[-_](ports|stp|fd|vlan-aware|vids)|ovs_type\s+OVSBridge)\b'; then
            local iface_name=$(sed "${start}q;d" "${iface_filepath}" | awk '{print $2}')
            BRIDGES="${iface_name}"$'\n'"${BRIDGES}"
          fi
        done <"${iface_indexes_tmpfile}"
        rm -f "${iface_indexes_tmpfile}"
      fi
    done
    IFS=$OLD_IFS
    BRIDGES=$(echo "$BRIDGES" | grep -v '^\s*$' | sort | uniq)

    # Build bridge menu
    BRIDGE_MENU_OPTIONS=()
    if [[ -n "$BRIDGES" ]]; then
      while IFS= read -r bridge; do
        if [[ -n "$bridge" ]]; then
          local description=$(grep -A 10 "iface $bridge" /etc/network/interfaces 2>/dev/null | grep '^#' | head -n1 | sed 's/^#[[:space:]-]*//')
          BRIDGE_MENU_OPTIONS+=("$bridge" "${description:- }")
        fi
      done <<<"$BRIDGES"
    fi
    if [[ -f /etc/pve/sdn/vnets.cfg ]]; then
      while IFS= read -r vnet; do
        [[ -n "$vnet" ]] && BRIDGE_MENU_OPTIONS+=("sdn:${vnet}" "[SDN] ${vnet}")
      done < <(awk '/^vnet:/{print $2}' /etc/pve/sdn/vnets.cfg 2>/dev/null)
    fi
  }
  _detect_bridges
  fi

  # Main wizard loop
  while [ $STEP -le $MAX_STEP ]; do
    case $STEP in

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 1: Container Type
    # ═══════════════════════════════════════════════════════════════════════════
    1)
      local default_on="ON"
      local default_off="OFF"
      [[ "$_ct_type" == "0" ]] && {
        default_on="OFF"
        default_off="ON"
      }

      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CONTAINER TYPE" \
        --ok-button "Next" --cancel-button "Exit" \
        --radiolist "\nChoose container type:\n\nUse SPACE to select, ENTER to confirm." 14 58 2 \
        "1" "Unprivileged (recommended)" $default_on \
        "0" "Privileged" $default_off \
        3>&1 1>&2 2>&3); then
        [[ -n "$result" ]] && _ct_type="$result"
        ((STEP++))
      else
        exit_script
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 2: Root Password
    # ═══════════════════════════════════════════════════════════════════════════
    2)
      if PW1=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "ROOT PASSWORD" \
        --ok-button "Next" --cancel-button "Back" \
        --passwordbox "\nSet Root Password (needed for root ssh access)\n\nLeave blank for automatic login (no password)" 12 58 \
        3>&1 1>&2 2>&3); then

        if [[ -z "$PW1" ]]; then
          _pw=""
          _pw_display="Automatic Login"
          ((STEP++))
        elif [[ "$PW1" == *" "* ]]; then
          whiptail --msgbox "Password cannot contain spaces." 8 58
        else
          local _pw1_clean="$PW1"
          while [[ "$_pw1_clean" == -* ]]; do
            _pw1_clean="${_pw1_clean#-}"
          done
          if [[ -z "$_pw1_clean" ]]; then
            whiptail --msgbox "Password cannot be only '-' characters." 8 58
            continue
          elif ((${#_pw1_clean} < 5)); then
            whiptail --msgbox "Password must be at least 5 characters (after removing leading '-')." 8 70
            continue
          fi
          # Verify password
          if PW2=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
            --title "PASSWORD VERIFICATION" \
            --ok-button "Confirm" --cancel-button "Back" \
            --passwordbox "\nVerify Root Password" 10 58 \
            3>&1 1>&2 2>&3); then
            local _pw2_clean="$PW2"
            while [[ "$_pw2_clean" == -* ]]; do
              _pw2_clean="${_pw2_clean#-}"
            done
            if [[ "$_pw1_clean" == "$_pw2_clean" ]]; then
              # The value alone, without the "--password " flag. PW reaches pct
              # through the quoted _PW_ARGS array, which supplies the flag
              # itself; carrying it here too produced
              # --password '--password secret' and pct answered "400 unable to
              # parse option". base_settings() already stores var_pw this way.
              _pw="$_pw1_clean"
              _pw_display="********"
              ((STEP++))
            else
              whiptail --msgbox "Passwords do not match. Please try again." 8 58
            fi
          else
            ((STEP--))
          fi
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 3: Container ID
    # ═══════════════════════════════════════════════════════════════════════════
    3)
      local id_dialog_title="CONTAINER ID"
      declare -f lxc_backend_uses_named_containers &>/dev/null && id_dialog_title="CONTAINER NAME"
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "$id_dialog_title" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet ${id_dialog_title}" 10 58 "$_ct_id" \
        3>&1 1>&2 2>&3); then
        local input_id="${result:-$NEXTID}"

        # Validate that ID is numeric (Proxmox) unless backend uses names (Incus)
        if ! declare -f lxc_backend_uses_named_containers &>/dev/null; then
          if ! [[ "$input_id" =~ ^[0-9]+$ ]]; then
            whiptail --backtitle "Proxmox VE Helper Scripts" --title "Invalid ID" --msgbox "Container ID must be numeric." 8 58
            continue
          fi
        fi

        # Check if ID is already in use
        if ! validate_container_id "$input_id"; then
          if whiptail --backtitle "Proxmox VE Helper Scripts" --title "ID Already In Use" \
            --yesno "Container/VM ID $input_id is already in use.\n\nWould you like to use the next available ID ($(get_valid_container_id "$input_id"))?" 10 58; then
            _ct_id=$(get_valid_container_id "$input_id")
          else
            continue
          fi
        else
          _ct_id="$input_id"
        fi
        ((STEP++))
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 4: Hostname
    # ═══════════════════════════════════════════════════════════════════════════
    4)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "HOSTNAME" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet Hostname (or FQDN, e.g. host.example.com)" 10 58 "$_hostname" \
        3>&1 1>&2 2>&3); then
        local hn_test="${result:-$NSAPP}"
        hn_test=$(echo "${hn_test,,}" | tr -d ' ')

        if validate_hostname "$hn_test"; then
          _hostname="$hn_test"
          ((STEP++))
        else
          whiptail --msgbox "Invalid hostname: '$hn_test'\n\nRules:\n- Only lowercase letters, digits, dots and hyphens\n- Labels separated by dots (max 63 chars each)\n- No leading/trailing hyphens or dots\n- No consecutive dots\n- Total max 253 characters" 14 60
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 5: Disk Size
    # ═══════════════════════════════════════════════════════════════════════════
    5)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "DISK SIZE" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet Disk Size in GB" 10 58 "$_disk_size" \
        3>&1 1>&2 2>&3); then
        local disk_test="${result:-$var_disk}"
        if [[ "$disk_test" =~ ^[1-9][0-9]*$ ]]; then
          _disk_size="$disk_test"
          ((STEP++))
        else
          whiptail --msgbox "Disk size must be a positive integer!" 8 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 6: CPU Cores
    # ═══════════════════════════════════════════════════════════════════════════
    6)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CPU CORES" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nAllocate CPU Cores" 10 58 "$_core_count" \
        3>&1 1>&2 2>&3); then
        local cpu_test="${result:-$var_cpu}"
        if [[ "$cpu_test" =~ ^[1-9][0-9]*$ ]]; then
          _core_count="$cpu_test"
          ((STEP++))
        else
          whiptail --msgbox "CPU core count must be a positive integer!" 8 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 7: RAM Size
    # ═══════════════════════════════════════════════════════════════════════════
    7)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "RAM SIZE" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nAllocate RAM in MiB" 10 58 "$_ram_size" \
        3>&1 1>&2 2>&3); then
        local ram_test="${result:-$var_ram}"
        if validate_ram_size "$ram_test"; then
          _ram_size="$ram_test"
          ((STEP++))
        elif [[ "$ram_test" =~ ^[1-9][0-9]*$ ]]; then
          whiptail --msgbox "RAM is set in MiB, and ${ram_test} MiB is too little.\n\nDid you mean $((ram_test * 1024)) MiB (${ram_test} GiB)?" 10 58
        else
          whiptail --msgbox "RAM size must be a positive integer!" 8 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 8: Network Bridge
    # ═══════════════════════════════════════════════════════════════════════════
    8)
      if [[ ${#BRIDGE_MENU_OPTIONS[@]} -eq 0 ]]; then
        # Validate default bridge exists
        if validate_bridge "vmbr0"; then
          _bridge="vmbr0"
          _sdn_vnet=""
          ((STEP++))
        else
          whiptail --msgbox "Default bridge 'vmbr0' not found!\n\nPlease configure a network bridge in Proxmox first." 10 58
          msg_error "Default bridge 'vmbr0' not found"
          exit 116
        fi
      else
        if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
          --title "NETWORK BRIDGE" \
          --ok-button "Next" --cancel-button "Back" \
          --menu "\nSelect network bridge:" 16 58 6 \
          "${BRIDGE_MENU_OPTIONS[@]}" \
          3>&1 1>&2 2>&3); then
          local bridge_test="${result:-vmbr0}"
          if [[ "$bridge_test" == "__other__" || "$bridge_test" == -* ]]; then
            continue
          fi
          if [[ "$bridge_test" == sdn:* ]]; then
            local vnet_test="${bridge_test#sdn:}"
            if validate_sdn_vnet "$vnet_test"; then
              _sdn_vnet="$vnet_test"
              _bridge="${var_brg:-vmbr0}"
              ((STEP++))
            else
              whiptail --msgbox "SDN vnet '$vnet_test' is not configured on this cluster." 8 58
            fi
          elif validate_bridge "$bridge_test"; then
            _bridge="$bridge_test"
            _sdn_vnet=""
            ((STEP++))
          else
            whiptail --msgbox "Bridge '$bridge_test' is not available or not active." 8 58
          fi
        else
          ((STEP--))
        fi
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 9: IPv4 Configuration
    # ═══════════════════════════════════════════════════════════════════════════
    9)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "IPv4 CONFIGURATION" \
        --ok-button "Next" --cancel-button "Back" \
        --menu "\nSelect IPv4 Address Assignment:" 16 65 3 \
        "dhcp" "Automatic (DHCP, recommended)" \
        "static" "Static (manual entry)" \
        "range" "IP Range Scan (find first free IP)" \
        3>&1 1>&2 2>&3); then

        if [[ "$result" == "static" ]]; then
          # Get static IP
          local static_ip
          if static_ip=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
            --title "STATIC IPv4 ADDRESS" \
            --ok-button "Next" --cancel-button "Back" \
            --inputbox "\nEnter Static IPv4 CIDR Address\n(e.g. 192.168.1.100/24)" 12 58 "" \
            3>&1 1>&2 2>&3); then
            if validate_ip_address "$static_ip"; then
              # Get gateway
              local gateway_ip
              if gateway_ip=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
                --title "GATEWAY IP" \
                --ok-button "Next" --cancel-button "Back" \
                --inputbox "\nEnter Gateway IP address" 10 58 "" \
                3>&1 1>&2 2>&3); then
                if validate_gateway_ip "$gateway_ip"; then
                  # Validate gateway is in same subnet
                  if validate_gateway_in_subnet "$static_ip" "$gateway_ip"; then
                    _net="$static_ip"
                    _gate=",gw=$gateway_ip"
                    ((STEP++))
                  else
                    whiptail --msgbox "Gateway is not in the same subnet as the static IP.\n\nStatic IP: $static_ip\nGateway: $gateway_ip" 10 58
                  fi
                else
                  whiptail --msgbox "Invalid Gateway IP format.\n\nEach octet must be 0-255.\nExample: 192.168.1.1" 10 58
                fi
              fi
            else
              whiptail --msgbox "Invalid IPv4 CIDR format.\n\nEach octet must be 0-255.\nCIDR must be 1-32.\nExample: 192.168.1.100/24" 12 58
            fi
          fi
        elif [[ "$result" == "range" ]]; then
          # IP Range Scan
          local ip_range
          if ip_range=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
            --title "IP RANGE SCAN" \
            --ok-button "Scan" --cancel-button "Back" \
            --inputbox "\nEnter IP range to scan for free address\n(e.g. 192.168.1.100/24-192.168.1.200/24)" 12 65 "" \
            3>&1 1>&2 2>&3); then
            if is_ip_range "$ip_range"; then
              # Exit whiptail screen temporarily to show scan progress
              _cs_clear
              header_info
              echo -e "${INFO}${BOLD}${DGN}Scanning IP range for free address...${CL}\n"
              if resolve_ip_from_range "$ip_range"; then
                # Get gateway
                local gateway_ip
                if gateway_ip=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
                  --title "GATEWAY IP" \
                  --ok-button "Next" --cancel-button "Back" \
                  --inputbox "\nFound free IP: $NET_RESOLVED\n\nEnter Gateway IP address" 12 58 "" \
                  3>&1 1>&2 2>&3); then
                  if validate_gateway_ip "$gateway_ip"; then
                    # Validate gateway is in same subnet
                    if validate_gateway_in_subnet "$NET_RESOLVED" "$gateway_ip"; then
                      _net="$NET_RESOLVED"
                      _gate=",gw=$gateway_ip"
                      ((STEP++))
                    else
                      whiptail --msgbox "Gateway is not in the same subnet as the IP.\n\nIP: $NET_RESOLVED\nGateway: $gateway_ip" 10 58
                    fi
                  else
                    whiptail --msgbox "Invalid Gateway IP format.\n\nEach octet must be 0-255.\nExample: 192.168.1.1" 10 58
                  fi
                fi
              else
                whiptail --msgbox "No free IP found in the specified range.\nAll IPs responded to ping." 10 58
              fi
            else
              whiptail --msgbox "Invalid IP range format.\n\nExample: 192.168.1.100/24-192.168.1.200/24" 10 58
            fi
          fi
        else
          _net="dhcp"
          _gate=""
          ((STEP++))
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 10: IPv6 Configuration
    # ═══════════════════════════════════════════════════════════════════════════
    10)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "IPv6 CONFIGURATION" \
        --ok-button "Next" --cancel-button "Back" \
        --menu "\nSelect IPv6 Address Management:" 16 70 5 \
        "auto" "SLAAC/AUTO (recommended) - Dynamic IPv6 from network" \
        "dhcp" "DHCPv6 - DHCP-assigned IPv6 address" \
        "static" "Static - Manual IPv6 address configuration" \
        "none" "None - No IPv6 assignment (most containers)" \
        "disable" "Fully Disabled - (breaks some services)" \
        3>&1 1>&2 2>&3); then

        _ipv6_method="$result"
        case "$result" in
        static)
          local ipv6_addr
          if ipv6_addr=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
            --title "STATIC IPv6 ADDRESS" \
            --inputbox "\nEnter IPv6 CIDR address\n(e.g. 2001:db8::1/64)" 12 58 "" \
            3>&1 1>&2 2>&3); then
            if validate_ipv6_address "$ipv6_addr"; then
              _ipv6_addr="$ipv6_addr"
              # Optional gateway - loop until valid or empty
              local ipv6_gw_valid=false
              while [[ "$ipv6_gw_valid" == "false" ]]; do
                local ipv6_gw
                ipv6_gw=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
                  --title "IPv6 GATEWAY" \
                  --inputbox "\nEnter IPv6 gateway (optional, leave blank for none)" 10 58 "" \
                  3>&1 1>&2 2>&3) || true
                # Validate gateway if provided
                if [[ -n "$ipv6_gw" ]]; then
                  if validate_ipv6_address "$ipv6_gw"; then
                    _ipv6_gate="$ipv6_gw"
                    ipv6_gw_valid=true
                    ((STEP++))
                  else
                    whiptail --msgbox "Invalid IPv6 gateway format.\n\nExample: 2001:db8::1" 8 58
                  fi
                else
                  _ipv6_gate=""
                  ipv6_gw_valid=true
                  ((STEP++))
                fi
              done
            else
              whiptail --msgbox "Invalid IPv6 CIDR format.\n\nExample: 2001:db8::1/64\nCIDR must be 1-128." 10 58
            fi
          fi
          ;;
        dhcp)
          _ipv6_addr="dhcp"
          _ipv6_gate=""
          ((STEP++))
          ;;

        none)
          _ipv6_addr="none"
          _ipv6_gate=""
          ((STEP++))
          ;;
        *)
          _ipv6_addr=""
          _ipv6_gate=""
          ((STEP++))
          ;;
        esac
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 11: MTU Size
    # ═══════════════════════════════════════════════════════════════════════════
    11)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "MTU SIZE" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet Interface MTU Size\n(leave blank for default 1500, common values: 1500, 9000)" 12 62 "" \
        3>&1 1>&2 2>&3); then
        if validate_mtu "$result"; then
          _mtu="$result"
          ((STEP++))
        else
          whiptail --msgbox "Invalid MTU size.\n\nMTU must be between 576 and 65535.\nCommon values: 1500 (default), 9000 (jumbo frames)" 10 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 12: DNS Search Domain
    # ═══════════════════════════════════════════════════════════════════════════
    12)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "DNS SEARCH DOMAIN" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet DNS Search Domain\n(leave blank to use host setting)" 12 58 "" \
        3>&1 1>&2 2>&3); then
        if validate_searchdomain "$result"; then
          _sd="$result"
          ((STEP++))
        else
          whiptail --msgbox "Not a valid DNS domain.\n\nExample: home.lan or example.com" 10 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 13: DNS Server
    # ═══════════════════════════════════════════════════════════════════════════
    13)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "DNS SERVER" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet DNS Server IP\n(leave blank to use host setting)" 12 58 "" \
        3>&1 1>&2 2>&3); then
        if validate_nameservers "$result"; then
          _ns="$result"
          ((STEP++))
        else
          whiptail --msgbox "Enter IP addresses only, separated by spaces.\n\nExample: 1.1.1.1 9.9.9.9" 10 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 14: MAC Address
    # ═══════════════════════════════════════════════════════════════════════════
    14)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "MAC ADDRESS" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet MAC Address\n(leave blank for auto-generated, format: XX:XX:XX:XX:XX:XX)" 12 62 "" \
        3>&1 1>&2 2>&3); then
        if validate_mac_address "$result"; then
          _mac="$result"
          ((STEP++))
        else
          whiptail --msgbox "Invalid MAC address format.\n\nRequired format: XX:XX:XX:XX:XX:XX\nExample: 02:00:00:00:00:01" 10 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 15: VLAN Tag
    # ═══════════════════════════════════════════════════════════════════════════
    15)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "VLAN TAG" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet VLAN Tag (1-4094)\n(leave blank for no VLAN)" 12 58 "" \
        3>&1 1>&2 2>&3); then
        if validate_vlan_tag "$result"; then
          _vlan="$result"
          ((STEP++))
        else
          whiptail --msgbox "Invalid VLAN tag.\n\nVLAN must be a number between 1 and 4094." 8 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 16: Tags
    # ═══════════════════════════════════════════════════════════════════════════
    16)
      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CONTAINER TAGS" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet Custom Tags (semicolon-separated)\n(alphanumeric, hyphens, underscores only)" 12 58 "$_tags" \
        3>&1 1>&2 2>&3); then
        local tags_test="${result:-}"
        tags_test=$(echo "$tags_test" | tr -d '[:space:]')
        if validate_tags "$tags_test"; then
          _tags="$tags_test"
          ((STEP++))
        else
          whiptail --msgbox "Invalid tag format.\n\nTags can only contain:\n- Letters (a-z, A-Z)\n- Numbers (0-9)\n- Hyphens (-)\n- Underscores (_)\n- Semicolons (;) as separator" 14 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 17: SSH Settings
    # ═══════════════════════════════════════════════════════════════════════════
    17)
      configure_ssh_settings "Step $STEP/$MAX_STEP"
      # configure_ssh_settings handles its own flow, always advance
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 18: FUSE Support
    # ═══════════════════════════════════════════════════════════════════════════
    18)
      local fuse_default_flag="--defaultno"
      [[ "$_enable_fuse" == "yes" || "$_enable_fuse" == "1" ]] && fuse_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "FUSE SUPPORT" \
        --ok-button "Next" --cancel-button "Back" \
        $fuse_default_flag \
        --yesno "\nEnable FUSE support?\n\nRequired for: rclone, mergerfs, AppImage, etc.\n\n(App default: ${var_fuse:-no})" 14 58; then
        _enable_fuse="yes"
      else
        if [ $? -eq 1 ]; then
          _enable_fuse="no"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 19: TUN/TAP Support
    # ═══════════════════════════════════════════════════════════════════════════
    19)
      local tun_default_flag="--defaultno"
      [[ "$_enable_tun" == "yes" || "$_enable_tun" == "1" ]] && tun_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "TUN/TAP SUPPORT" \
        --ok-button "Next" --cancel-button "Back" \
        $tun_default_flag \
        --yesno "\nEnable TUN/TAP device support?\n\nRequired for: VPN apps (WireGuard, OpenVPN, Tailscale),\nnetwork tunneling, and containerized networking.\n\n(App default: ${var_tun:-no})" 14 62; then
        _enable_tun="yes"
      else
        if [ $? -eq 1 ]; then
          _enable_tun="no"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 20: Nesting Support
    # ═══════════════════════════════════════════════════════════════════════════
    20)
      local nesting_default_flag=""
      [[ "$_enable_nesting" == "0" || "$_enable_nesting" == "no" ]] && nesting_default_flag="--defaultno"

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "NESTING SUPPORT" \
        --ok-button "Next" --cancel-button "Back" \
        $nesting_default_flag \
        --yesno "\nEnable Nesting?\n\nRequired for: Docker, LXC inside LXC, Podman,\nand other containerization tools.\n\n(App default: ${var_nesting:-1})" 14 58; then
        _enable_nesting="1"
      else
        if [ $? -eq 1 ]; then
          _enable_nesting="0"
          if [[ "$var_os" != "alpine" ]]; then
            whiptail --backtitle "Proxmox VE Helper Scripts" \
              --title "⚠️ NESTING WARNING" \
              --msgbox "Modern systemd-based distributions (Debian 13+, Ubuntu 24.04+, etc.) may require nesting to be enabled for proper operation.\n\nWithout nesting, the container may start in a degraded state with failing services (error 243/CREDENTIALS).\n\nIf you experience issues, enable nesting in the container options." 14 68
          fi
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 21: GPU Passthrough
    # ═══════════════════════════════════════════════════════════════════════════
    21)
      local gpu_default_flag="--defaultno"
      [[ "$_enable_gpu" == "yes" ]] && gpu_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "GPU PASSTHROUGH" \
        --ok-button "Next" --cancel-button "Back" \
        $gpu_default_flag \
        --yesno "\nEnable GPU Passthrough?\n\nAutomatically detects and passes through available GPUs\n(Intel/AMD/NVIDIA) for hardware acceleration.\n\nRecommended for: Media servers, AI/ML, Transcoding\n\n(App default: ${var_gpu:-no})" 16 62; then
        _enable_gpu="yes"
      else
        if [ $? -eq 1 ]; then
          _enable_gpu="no"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 22: Keyctl Support (Docker/systemd)
    # ═══════════════════════════════════════════════════════════════════════════
    22)
      if [[ "$_ct_type" == "1" ]]; then
        _enable_keyctl="1"
        ((STEP++))
        continue
      fi

      local keyctl_default_flag="--defaultno"
      [[ "$_enable_keyctl" == "1" ]] && keyctl_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "KEYCTL SUPPORT" \
        --ok-button "Next" --cancel-button "Back" \
        $keyctl_default_flag \
        --yesno "\nEnable Keyctl support?\n\nRequired for: Docker containers, systemd-networkd,\nand kernel keyring operations.\n\nNote: Automatically enabled for unprivileged containers.\n\n(App default: ${var_keyctl:-0})" 16 62; then
        _enable_keyctl="1"
      else
        if [ $? -eq 1 ]; then
          _enable_keyctl="0"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 23: APT Cacher Proxy
    # ═══════════════════════════════════════════════════════════════════════════
    23)
      local apt_cacher_default_flag="--defaultno"
      [[ "$_apt_cacher" == "yes" ]] && apt_cacher_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "APT CACHER PROXY" \
        --ok-button "Next" --cancel-button "Back" \
        $apt_cacher_default_flag \
        --yesno "\nUse APT Cacher-NG proxy?\n\nSpeeds up package downloads by caching them locally.\nRequires apt-cacher-ng running on your network.\n\n(App default: ${var_apt_cacher:-no})" 14 62; then
        _apt_cacher="yes"
        # Ask for IP if enabled
        if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
          --title "APT CACHER IP" \
          --inputbox "\nEnter APT Cacher-NG IP or URL:\n(e.g. 192.168.1.10, http://host, https://host:443)" 12 62 "$_apt_cacher_ip" \
          3>&1 1>&2 2>&3); then
          _apt_cacher_ip="$result"
        fi
      else
        if [ $? -eq 1 ]; then
          _apt_cacher="no"
          _apt_cacher_ip=""
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 24: HTTP/HTTPS Proxy
    # ═══════════════════════════════════════════════════════════════════════════
    24)
      local http_proxy_default_flag="--defaultno"
      [[ -n "$_http_proxy" ]] && http_proxy_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "HTTP/HTTPS PROXY" \
        --ok-button "Next" --cancel-button "Back" \
        $http_proxy_default_flag \
        --yesno "\nUse HTTP/HTTPS proxy?\n\nRequired when internet access must go through a proxy server.\n(e.g. corporate networks)\n\n(App default: ${var_http_proxy:-none})" 14 62; then
        if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
          --title "HTTP PROXY URL" \
          --inputbox "\nEnter HTTP proxy URL:\n(e.g. http://proxy.local:8080)" 12 62 "$_http_proxy" \
          3>&1 1>&2 2>&3); then
          _http_proxy="$result"
          local _no_proxy_default="${_http_no_proxy:-localhost,127.0.0.1,.local}"
          if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
            --title "NO_PROXY EXCEPTIONS" \
            --inputbox "\nEnter NO_PROXY exceptions (comma-separated):\nLeave empty for defaults." 12 62 "$_no_proxy_default" \
            3>&1 1>&2 2>&3); then
            _http_no_proxy="$result"
          fi
        fi
      else
        if [ $? -eq 1 ]; then
          _http_proxy=""
          _http_no_proxy=""
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 25: Host CA Inheritance
    # ═══════════════════════════════════════════════════════════════════════════
    25)
      local host_ca_count=0
      local host_ca_dir="/usr/local/share/ca-certificates"
      local cert
      shopt -s nullglob
      for cert in "$host_ca_dir"/*.crt; do
        host_ca_count=$((host_ca_count + 1))
      done
      shopt -u nullglob

      if [[ $host_ca_count -eq 0 ]]; then
        _inherit_host_ca="no"
        ((STEP++))
        continue
      fi

      local host_ca_default_flag="--defaultno"
      [[ "$_inherit_host_ca" == "yes" ]] && host_ca_default_flag=""
      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "HOST CA INHERITANCE" \
        --ok-button "Next" --cancel-button "Back" \
        $host_ca_default_flag \
        --yesno "\nInherit host CA certificates into this container?\n\nDetected on host: ${host_ca_count} certificate(s) in:\n${host_ca_dir}\n\nRecommended for private PKI / TLS-inspection environments.\n\n(App default: ${var_inherit_host_ca:-no})" 16 72; then
        _inherit_host_ca="yes"
      else
        if [ $? -eq 1 ]; then
          _inherit_host_ca="no"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 26: Container Timezone
    # ═══════════════════════════════════════════════════════════════════════════
    26)
      local tz_hint="$_ct_timezone"
      [[ -z "$tz_hint" ]] && tz_hint="(empty - will use host timezone)"

      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CONTAINER TIMEZONE" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nSet container timezone.\n\nExamples: Europe/Berlin, America/New_York, Asia/Tokyo\n\nHost timezone: ${_host_timezone:-unknown}\n\nLeave empty to inherit from host." 16 62 "$_ct_timezone" \
        3>&1 1>&2 2>&3); then
        local tz_test="$result"
        [[ "${tz_test:-}" == Etc/* ]] && tz_test="host" # pct doesn't accept Etc/* zones
        if validate_timezone "$tz_test"; then
          _ct_timezone="$tz_test"
          ((STEP++))
        else
          whiptail --msgbox "Invalid timezone: '$result'\n\nTimezone must exist in /usr/share/zoneinfo/\n\nExamples:\n- Europe/Berlin\n- America/New_York\n- Asia/Tokyo\n- UTC" 14 58
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 27: Container Protection
    # ═══════════════════════════════════════════════════════════════════════════
    27)
      local protect_default_flag="--defaultno"
      [[ "$_protect_ct" == "yes" || "$_protect_ct" == "1" ]] && protect_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CONTAINER PROTECTION" \
        --ok-button "Next" --cancel-button "Back" \
        $protect_default_flag \
        --yesno "\nEnable Container Protection?\n\nPrevents accidental deletion of this container.\nYou must disable protection before removing.\n\n(App default: ${var_protection:-no})" 14 62; then
        _protect_ct="yes"
      else
        if [ $? -eq 1 ]; then
          _protect_ct="no"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 28: Device Node Creation (mknod)
    # ═══════════════════════════════════════════════════════════════════════════
    28)
      local mknod_default_flag="--defaultno"
      [[ "$_enable_mknod" == "1" ]] && mknod_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "DEVICE NODE CREATION" \
        --ok-button "Next" --cancel-button "Back" \
        $mknod_default_flag \
        --yesno "\nAllow device node creation (mknod)?\n\nRequired for: Creating device files inside container.\n\n(App default: ${var_mknod:-0})" 13 62; then
        _enable_mknod="1"
      else
        if [ $? -eq 1 ]; then
          _enable_mknod="0"
        else
          ((STEP--))
          continue
        fi
      fi
      ((STEP++))
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 29: Mount Filesystems
    # ═══════════════════════════════════════════════════════════════════════════
    29)
      local mount_hint=""
      [[ -n "$_mount_fs" ]] && mount_hint="$_mount_fs" || mount_hint="(none)"

      if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "MOUNT FILESYSTEMS" \
        --ok-button "Next" --cancel-button "Back" \
        --inputbox "\nAllow specific filesystem mounts.\n\nComma-separated list: nfs, cifs, fuse, ext4, etc.\nLeave empty for defaults (none).\n\nCurrent: $mount_hint" 14 62 "$_mount_fs" \
        3>&1 1>&2 2>&3); then
        result="${result// /}"
        result="${result%%,}"
        result="${result##,}"
        if validate_mount_fs "$result"; then
          _mount_fs="$result"
          ((STEP++))
        else
          whiptail --msgbox "Enter filesystem types such as nfs, cifs or ext4, not paths.\n\nTo share a host directory, add a bind mount (mp0) to the container after it is created." 12 66
        fi
      else
        ((STEP--))
      fi
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 30: Optional host-side post-install hook (path on the Proxmox HOST)
    # ═══════════════════════════════════════════════════════════════════════════
    30)
      local _hook_prompt="Optional: absolute path to a *.sh file ON THE PROXMOX HOST.

It runs as root on the HOST (NOT in the LXC) after the container
is fully provisioned and started.

Available env vars: APP, NSAPP, CTID, IP, HN, STORAGE, BRG.

Leave empty to skip."
      while true; do
        if result=$(whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
          --title "POST-INSTALL HOOK (HOST)" \
          --ok-button "Next" --cancel-button "Back" \
          --inputbox "$_hook_prompt" 16 70 "${_post_install}" \
          3>&1 1>&2 2>&3); then
          result="$(printf '%s' "$result" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
          if [[ -z "$result" ]]; then
            _post_install=""
            ((STEP++))
            break
          fi
          if [[ "$result" == *';'* || "$result" == *'$('* || "$result" == *'`'* || "$result" == *'&&'* || "$result" == *'||'* ]]; then
            whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID PATH" \
              --msgbox "Path contains shell metacharacters. Please provide a plain absolute file path." 10 70
            continue
          fi
          if [[ "$result" != /* ]]; then
            whiptail --backtitle "Proxmox VE Helper Scripts" --title "INVALID PATH" \
              --msgbox "Path must be absolute (start with /).\n\nGot: $result" 10 70
            continue
          fi
          if [[ ! -f "$result" ]]; then
            if ! whiptail --backtitle "Proxmox VE Helper Scripts" --title "FILE NOT FOUND" \
              --yesno "File does not exist on host:\n\n$result\n\nKeep this path anyway?" 12 70; then
              continue
            fi
          fi
          _post_install="$result"
          ((STEP++))
          break
        else
          ((STEP--))
          break
        fi
      done
      ;;

    # ═══════════════════════════════════════════════════════════════════════════
    # STEP 31: Verbose Mode & Confirmation
    # ═══════════════════════════════════════════════════════════════════════════
    31)
      local verbose_default_flag="--defaultno"
      [[ "$_verbose" == "yes" ]] && verbose_default_flag=""

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "VERBOSE MODE" \
        $verbose_default_flag \
        --yesno "\nEnable Verbose Mode?\n\nShows detailed output during installation." 12 58; then
        _verbose="yes"
      else
        _verbose="no"
      fi
      # Build summary
      local ct_type_desc="Unprivileged"
      [[ "$_ct_type" == "0" ]] && ct_type_desc="Privileged"

      local nesting_desc="Disabled"
      [[ "$_enable_nesting" == "1" ]] && nesting_desc="Enabled"

      local keyctl_desc="Disabled"
      [[ "$_enable_keyctl" == "1" ]] && keyctl_desc="Enabled"

      local protect_desc="No"
      [[ "$_protect_ct" == "yes" || "$_protect_ct" == "1" ]] && protect_desc="Yes"

      local tz_display="${_ct_timezone:-Host TZ}"
      local apt_display="${_apt_cacher:-no}"
      [[ "$_apt_cacher" == "yes" && -n "$_apt_cacher_ip" ]] && apt_display="$_apt_cacher_ip"
      local sdn_display="${_sdn_vnet:-(none)}"
      local http_proxy_display="${_http_proxy:-(none)}"
      local inherit_ca_display="${_inherit_host_ca:-no}"
      local post_install_display="${_post_install:-(none)}"
      local post_install_warn=""
      [[ -n "$_post_install" ]] && post_install_warn="
  ⚠ Hook runs as root on Proxmox HOST (not in LXC)"

      local summary="Container Type: $ct_type_desc
Container ID: $_ct_id
Hostname: $_hostname

Resources:
  Disk: ${_disk_size} GB
  CPU: $_core_count cores
  RAM: $_ram_size MiB

Network:
  Bridge: $_bridge
  SDN vnet: $sdn_display
  IPv4: $_net
  IPv6: $_ipv6_method

Features:
  FUSE: $_enable_fuse | TUN: $_enable_tun
  Nesting: $nesting_desc | Keyctl: $keyctl_desc
  Mknod: $([ "$_enable_mknod" == "1" ] && echo Enabled || echo Disabled) | Mount FS: ${_mount_fs:-(none)}
  GPU: $_enable_gpu | Protection: $protect_desc

Advanced:
  Timezone: $tz_display
  APT Cacher: $apt_display
  HTTP Proxy: $http_proxy_display
  Inherit Host CAs: $inherit_ca_display
  Verbose: $_verbose
  Post-Install Script: ${post_install_display}${post_install_warn}"

      if whiptail --backtitle "Proxmox VE Helper Scripts [Step $STEP/$MAX_STEP]" \
        --title "CONFIRM SETTINGS" \
        --ok-button "Create LXC" --cancel-button "Back" \
        --yesno "$summary\n\nCreate ${APP} LXC with these settings?" 32 62; then
        ((STEP++))
      else
        ((STEP--))
      fi
      ;;
    esac
  done

  # ═══════════════════════════════════════════════════════════════════════════
  # Apply all collected values to global variables
  # ═══════════════════════════════════════════════════════════════════════════
  CT_TYPE="$_ct_type"
  PW="$_pw"
  CT_ID="$_ct_id"
  HN="$_hostname"
  DISK_SIZE="$_disk_size"
  CORE_COUNT="$_core_count"
  RAM_SIZE="$_ram_size"
  BRG="$_bridge"
  SDN_VNET="$_sdn_vnet"
  NET="$_net"
  GATE="$_gate"
  IPV6_METHOD="$_ipv6_method"
  IPV6_ADDR="$_ipv6_addr"
  IPV6_GATE="$_ipv6_gate"
  TAGS="$_tags"
  ENABLE_FUSE="$_enable_fuse"
  ENABLE_TUN="$_enable_tun"
  ENABLE_GPU="$_enable_gpu"
  ENABLE_NESTING="$_enable_nesting"
  ENABLE_KEYCTL="$_enable_keyctl"
  ENABLE_MKNOD="$_enable_mknod"
  ALLOW_MOUNT_FS="$_mount_fs"
  PROTECT_CT="$_protect_ct"
  CT_TIMEZONE="$_ct_timezone"
  APT_CACHER="$_apt_cacher"
  APT_CACHER_IP="$_apt_cacher_ip"
  HTTP_PROXY="$_http_proxy"
  HTTP_NO_PROXY="$_http_no_proxy"
  INHERIT_HOST_CA="$_inherit_host_ca"
  VERBOSE="$_verbose"
  var_post_install="$_post_install"

  # Update var_* based on user choice (for functions that check these)
  var_gpu="$_enable_gpu"
  var_sdn_vnet="$_sdn_vnet"
  var_fuse="$_enable_fuse"
  var_tun="$_enable_tun"
  var_nesting="$_enable_nesting"
  var_keyctl="$_enable_keyctl"
  var_mknod="$_enable_mknod"
  var_mount_fs="$_mount_fs"
  var_protection="$_protect_ct"
  var_timezone="$_ct_timezone"
  var_apt_cacher="$_apt_cacher"
  var_apt_cacher_ip="$_apt_cacher_ip"
  var_http_proxy="$_http_proxy"
  var_http_no_proxy="$_http_no_proxy"
  var_inherit_host_ca="$_inherit_host_ca"

  # Format optional values
  [[ -n "$_mtu" ]] && MTU=",mtu=$_mtu" || MTU=""
  [[ -n "$_sd" ]] && SD="-searchdomain=$_sd" || SD=""
  [[ -n "$_ns" ]] && NS="-nameserver=$_ns" || NS=""
  [[ -n "$_mac" ]] && MAC=",hwaddr=$_mac" || MAC=""
  [[ -n "$_vlan" ]] && VLAN=",tag=$_vlan" || VLAN=""

  # Alpine UDHCPC fix
  if [ "$var_os" == "alpine" ] && [ "$NET" == "dhcp" ] && [ -n "$_ns" ]; then
    UDHCPC_FIX="yes"
  else
    UDHCPC_FIX="no"
  fi
  export UDHCPC_FIX
  export SSH_KEYS_FILE

  # Exit alternate screen buffer before showing summary (so output remains visible)
  tput rmcup 2>/dev/null || true
  trap - RETURN

  # Display final summary
  echo -e "\n${INFO}${BOLD}${DGN}$(_cs_host_version_line) (Kernel: ${KERNEL_VERSION})${CL}"
  local engine_ref scripts_ref
  engine_ref="$(_cs_engine_ref_line)"
  scripts_ref="$(_cs_scripts_ref_line)"
  [[ -n "$engine_ref" ]] && echo -e "${OVERRIDE}${BOLD}${YWB}${engine_ref}${CL}"
  [[ -n "$scripts_ref" ]] && echo -e "${OVERRIDE}${BOLD}${YWB}${scripts_ref}${CL}"
  echo -e "${OS}${BOLD}${DGN}Operating System: ${BGN}$var_os${CL}"
  echo -e "${OSVERSION}${BOLD}${DGN}Version: ${BGN}$var_version${CL}"
  echo -e "${CONTAINERTYPE}${BOLD}${DGN}Container Type: ${BGN}$([ "$CT_TYPE" == "1" ] && echo "Unprivileged" || echo "Privileged")${CL}"
  echo -e "${CONTAINERID}${BOLD}${DGN}Container ID: ${BGN}$CT_ID${CL}"
  echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
  echo -e "${DISKSIZE}${BOLD}${DGN}Disk Size: ${BGN}${DISK_SIZE} GB${CL}"
  echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
  echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}${RAM_SIZE} MiB${CL}"
  echo -e "${BRIDGE}${BOLD}${DGN}Bridge: ${BGN}$BRG${CL}"
  [[ -n "${SDN_VNET:-}" ]] && echo -e "${BRIDGE}${BOLD}${DGN}SDN vnet: ${BGN}$SDN_VNET${CL}"
  echo -e "${NETWORK}${BOLD}${DGN}IPv4: ${BGN}$NET${CL}"
  echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}$IPV6_METHOD${CL}"
  echo -e "${FUSE}${BOLD}${DGN}FUSE Support: ${BGN}${ENABLE_FUSE:-no}${CL}"
  [[ "${ENABLE_TUN:-no}" == "yes" ]] && echo -e "${NETWORK}${BOLD}${DGN}TUN/TAP Support: ${BGN}$ENABLE_TUN${CL}"
  echo -e "${CONTAINERTYPE}${BOLD}${DGN}Nesting: ${BGN}$([ "${ENABLE_NESTING:-1}" == "1" ] && echo "Enabled" || echo "Disabled")${CL}"
  [[ "${ENABLE_KEYCTL:-0}" == "1" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Keyctl: ${BGN}Enabled${CL}"
  echo -e "${GPU}${BOLD}${DGN}GPU Passthrough: ${BGN}${ENABLE_GPU:-no}${CL}"
  [[ "${ENABLE_MKNOD:-0}" == "1" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Mknod: ${BGN}Enabled${CL}"
  [[ -n "${ALLOW_MOUNT_FS:-}" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Mount FS: ${BGN}${ALLOW_MOUNT_FS}${CL}"
  [[ "${PROTECT_CT:-no}" == "yes" || "${PROTECT_CT:-no}" == "1" ]] && echo -e "${CONTAINERTYPE}${BOLD}${DGN}Protection: ${BGN}Enabled${CL}"
  [[ -n "${CT_TIMEZONE:-}" ]] && echo -e "${INFO}${BOLD}${DGN}Timezone: ${BGN}$CT_TIMEZONE${CL}"
  [[ "$APT_CACHER" == "yes" ]] && echo -e "${INFO}${BOLD}${DGN}APT Cacher: ${BGN}$APT_CACHER_IP${CL}"
  [[ -n "${HTTP_PROXY:-}" ]] && echo -e "${INFO}${BOLD}${DGN}HTTP Proxy: ${BGN}$HTTP_PROXY${CL}"
  [[ "${INHERIT_HOST_CA:-no}" == "yes" ]] && echo -e "${INFO}${BOLD}${DGN}Host CA Inheritance: ${BGN}Enabled${CL}"
  [[ -n "${var_post_install:-}" ]] && echo -e "${INFO}${BOLD}${DGN}Post-Install Hook: ${BGN}${var_post_install}${CL}"
  echo -e "${SEARCH}${BOLD}${DGN}Verbose Mode: ${BGN}$VERBOSE${CL}"
  echo -e "${CREATING}${BOLD}${RD}Creating a ${APP} LXC using the above advanced settings${CL}"

  # Log settings to file
  log_section "CONTAINER SETTINGS (ADVANCED) - ${APP}"
  log_msg "Application: ${APP}"
  log_msg "$(_cs_host_version_line) (Kernel: ${KERNEL_VERSION})"
  [[ -n "$engine_ref" ]] && log_msg "$engine_ref"
  [[ -n "$scripts_ref" ]] && log_msg "$scripts_ref"
  log_msg "Operating System: $var_os ($var_version)"
  log_msg "Container Type: $([ "$CT_TYPE" == "1" ] && echo "Unprivileged" || echo "Privileged")"
  log_msg "Container ID: $CT_ID"
  log_msg "Hostname: $HN"
  log_msg "Disk Size: ${DISK_SIZE} GB"
  log_msg "CPU Cores: $CORE_COUNT"
  log_msg "RAM Size: ${RAM_SIZE} MiB"
  log_msg "Bridge: $BRG"
  [[ -n "${SDN_VNET:-}" ]] && log_msg "SDN vnet: ${SDN_VNET}"
  log_msg "IPv4: $NET"
  log_msg "IPv6: $IPV6_METHOD"
  log_msg "FUSE Support: ${ENABLE_FUSE:-no}"
  log_msg "Nesting: $([ "${ENABLE_NESTING:-1}" == "1" ] && echo "Enabled" || echo "Disabled")"
  log_msg "Mknod: $([ "${ENABLE_MKNOD:-0}" == "1" ] && echo "Enabled" || echo "Disabled")"
  [[ -n "${ALLOW_MOUNT_FS:-}" ]] && log_msg "Mount FS: ${ALLOW_MOUNT_FS}"
  log_msg "GPU Passthrough: ${ENABLE_GPU:-no}"
  [[ -n "${HTTP_PROXY:-}" ]] && log_msg "HTTP Proxy: ${HTTP_PROXY}"
  [[ "${INHERIT_HOST_CA:-no}" == "yes" ]] && log_msg "Host CA Inheritance: Enabled"
  [[ -n "${var_post_install:-}" ]] && log_msg "Post-Install Hook: ${var_post_install}"
  log_msg "Verbose Mode: $VERBOSE"
  log_msg "Session ID: ${SESSION_ID}"
}