# Copyright (c) 2021-2026 tteck
# Author: tteck (tteckster)
# Co-Author: MickLesk
# Co-Author: michelroegl-brunner
# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE

variables() {
  NSAPP=$(echo "${APP,,}" | tr -d ' ')              # This function sets the NSAPP variable by converting the value of the APP variable to lowercase and removing any spaces.
  var_install="${NSAPP}-install"                    # sets the var_install variable by appending "-install" to the value of NSAPP.
  INTEGER='^[0-9]+([.][0-9]+)?$'                    # it defines the INTEGER regular expression pattern.
  PVEHOST_NAME=$(hostname)                          # gets the Proxmox Hostname and sets it to Uppercase
  DIAGNOSTICS="yes"                                 # sets the DIAGNOSTICS variable to "yes", used for the API call.
  METHOD="default"                                  # sets the METHOD variable to "default", used for the API call.
  RANDOM_UUID="$(cat /proc/sys/kernel/random/uuid)" # generates a random UUID and sets it to the RANDOM_UUID variable.
  CT_TYPE=${var_unprivileged:-$CT_TYPE}
}

source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/api.func)

if command -v curl >/dev/null 2>&1; then
  source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/core.func)
  load_functions
elif command -v wget >/dev/null 2>&1; then
  source <(wget -qO- https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/core.func)
  load_functions
fi
# This function enables error handling in the script by setting options and defining a trap for the ERR signal.
catch_errors() {
  set -Eeo pipefail
  trap 'error_handler $LINENO "$BASH_COMMAND"' ERR
}

# This function is called when an error occurs. It receives the exit code, line number, and command that caused the error, and displays an error message.
error_handler() {
  source /dev/stdin <<<$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/api.func)
  printf "\e[?25h"
  local exit_code="$?"
  local line_number="$1"
  local command="$2"
  local error_message="${RD}[ERROR]${CL} in line ${RD}$line_number${CL}: exit code ${RD}$exit_code${CL}: while executing command ${YW}$command${CL}"
  post_update_to_api "failed" "${command}"
  echo -e "\n$error_message\n"
}

# Check if the current shell is using bash
shell_check() {
  if [[ "$(ps -p $$ -o comm=)" != "bash" ]]; then
    clear
    msg_error "Your default shell is not bash. Please report this to our github issues or discord."
    echo -e "\nExiting..."
    sleep 2
    exit
  fi
}

# Run as root only
root_check() {
  if [[ "$(id -u)" -ne 0 || $(ps -o comm= -p $PPID) == "sudo" ]]; then
    clear
    msg_error "Please run this script as root."
    echo -e "\nExiting..."
    sleep 2
    exit
  fi
}

# This function checks the version of Proxmox Virtual Environment (PVE) and exits if the version is not supported.
# Supported: Proxmox VE 8.0.x – 8.9.x, 9.0 and 9.1
pve_check() {
  local PVE_VER
  PVE_VER="$(pveversion | awk -F'/' '{print $2}' | awk -F'-' '{print $1}')"

  # Check for Proxmox VE 8.x: allow 8.0–8.9
  if [[ "$PVE_VER" =~ ^8\.([0-9]+) ]]; then
    local MINOR="${BASH_REMATCH[1]}"
    if ((MINOR < 0 || MINOR > 9)); then
      msg_error "This version of Proxmox VE is not supported."
      msg_error "Supported: Proxmox VE version 8.0 – 8.9"
      exit 1
    fi
    return 0
  fi

  # Check for Proxmox VE 9.x: allow 9.0 and 9.1
  if [[ "$PVE_VER" =~ ^9\.([0-9]+) ]]; then
    local MINOR="${BASH_REMATCH[1]}"
    if ((MINOR < 0 || MINOR > 1)); then
      msg_error "This version of Proxmox VE is not supported."
      msg_error "Supported: Proxmox VE version 9.0 – 9.1"
      exit 1
    fi
    return 0
  fi

  # All other unsupported versions
  msg_error "This version of Proxmox VE is not supported."
  msg_error "Supported versions: Proxmox VE 8.0 – 8.x or 9.0 – 9.1"
  exit 1
}

# When a node is running tens of containers, it's possible to exceed the kernel's cryptographic key storage allocations.
# These are tuneable, so verify if the currently deployment is approaching the limits, advise the user on how to tune the limits, and exit the script.
# https://cleveruptime.com/docs/files/proc-key-users | https://docs.kernel.org/security/keys/core.html
maxkeys_check() {
  # Read kernel parameters
  per_user_maxkeys=$(cat /proc/sys/kernel/keys/maxkeys 2>/dev/null || echo 0)
  per_user_maxbytes=$(cat /proc/sys/kernel/keys/maxbytes 2>/dev/null || echo 0)

  # Exit if kernel parameters are unavailable
  if [[ "$per_user_maxkeys" -eq 0 || "$per_user_maxbytes" -eq 0 ]]; then
    echo -e "${CROSS}${RD} Error: Unable to read kernel parameters. Ensure proper permissions.${CL}"
    exit 1
  fi

  # Fetch key usage for user ID 100000 (typical for containers)
  used_lxc_keys=$(awk '/100000:/ {print $2}' /proc/key-users 2>/dev/null || echo 0)
  used_lxc_bytes=$(awk '/100000:/ {split($5, a, "/"); print a[1]}' /proc/key-users 2>/dev/null || echo 0)

  # Calculate thresholds and suggested new limits
  threshold_keys=$((per_user_maxkeys - 100))
  threshold_bytes=$((per_user_maxbytes - 1000))
  new_limit_keys=$((per_user_maxkeys * 2))
  new_limit_bytes=$((per_user_maxbytes * 2))

  # Check if key or byte usage is near limits
  failure=0
  if [[ "$used_lxc_keys" -gt "$threshold_keys" ]]; then
    echo -e "${CROSS}${RD} Warning: Key usage is near the limit (${used_lxc_keys}/${per_user_maxkeys}).${CL}"
    echo -e "${INFO} Suggested action: Set ${GN}kernel.keys.maxkeys=${new_limit_keys}${CL} in ${BOLD}/etc/sysctl.d/98-community-scripts.conf${CL}."
    failure=1
  fi
  if [[ "$used_lxc_bytes" -gt "$threshold_bytes" ]]; then
    echo -e "${CROSS}${RD} Warning: Key byte usage is near the limit (${used_lxc_bytes}/${per_user_maxbytes}).${CL}"
    echo -e "${INFO} Suggested action: Set ${GN}kernel.keys.maxbytes=${new_limit_bytes}${CL} in ${BOLD}/etc/sysctl.d/98-community-scripts.conf${CL}."
    failure=1
  fi

  # Provide next steps if issues are detected
  if [[ "$failure" -eq 1 ]]; then
    echo -e "${INFO} To apply changes, run: ${BOLD}service procps force-reload${CL}"
    exit 1
  fi

  echo -e "${CM}${GN} All kernel key limits are within safe thresholds.${CL}"
}

# This function checks the system architecture and exits if it's not "amd64".
arch_check() {
  if [ "$(dpkg --print-architecture)" != "amd64" ]; then
    echo -e "\n ${INFO}${YWB}This script will not work with PiMox! \n"
    echo -e "\n ${YWB}Visit https://github.com/asylumexp/Proxmox for ARM64 support. \n"
    echo -e "Exiting..."
    sleep 2
    exit
  fi
}

# Function to get the current IP address based on the distribution
get_current_ip() {
  if [ -f /etc/os-release ]; then
    # Check for Debian/Ubuntu (uses hostname -I)
    if grep -qE 'ID=debian|ID=ubuntu' /etc/os-release; then
      CURRENT_IP=$(hostname -I | awk '{print $1}')
    # Check for Alpine (uses ip command)
    elif grep -q 'ID=alpine' /etc/os-release; then
      CURRENT_IP=$(ip -4 addr show eth0 | awk '/inet / {print $2}' | cut -d/ -f1 | head -n 1)
    else
      CURRENT_IP="Unknown"
    fi
  fi
  echo "$CURRENT_IP"
}

# Function to update the IP address in the MOTD file
update_motd_ip() {
  MOTD_FILE="/etc/motd"

  if [ -f "$MOTD_FILE" ]; then
    # Remove existing IP Address lines to prevent duplication
    sed -i '/IP Address:/d' "$MOTD_FILE"

    IP=$(get_current_ip)
    # Add the new IP address
    echo -e "${TAB}${NETWORK}${YW} IP Address: ${GN}${IP}${CL}" >>"$MOTD_FILE"
  fi
}

# This function checks if the script is running through SSH and prompts the user to confirm if they want to proceed or exit.
ssh_check() {
  if [ -n "${SSH_CLIENT:+x}" ]; then
    if whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "SSH DETECTED" --yesno "It's advisable to utilize the Proxmox shell rather than SSH, as there may be potential complications with variable retrieval. Proceed using SSH?" 10 72; then
      whiptail --backtitle "Proxmox VE Helper Scripts" --msgbox --title "Proceed using SSH" "You've chosen to proceed using SSH. If any issues arise, please run the script in the Proxmox shell before creating a repository issue." 10 72
    else
      clear
      echo "Exiting due to SSH usage. Please consider using the Proxmox shell."
      exit
    fi
  fi
}

base_settings() {
  # Default Settings
  CT_TYPE=${var_unprivileged:-"1"}
  DISK_SIZE=${var_disk:-"4"}
  CORE_COUNT=${var_cpu:-"1"}
  RAM_SIZE=${var_ram:-"1024"}
  VERBOSE=${var_verbose:-"${1:-no}"}
  PW=${var_pw:-""}
  CT_ID=${var_ctid:-$NEXTID}
  HN=${var_hostname:-$NSAPP}
  BRG=${var_brg:-"vmbr0"}
  NET=${var_net:-"dhcp"}
  IPV6_METHOD=${var_ipv6_method:-"none"}
  IPV6_STATIC=${var_ipv6_static:-""}
  GATE=${var_gateway:-""}
  APT_CACHER=${var_apt_cacher:-""}
  APT_CACHER_IP=${var_apt_cacher_ip:-""}
  MTU=${var_mtu:-""}
  SD=${var_storage:-""}
  NS=${var_ns:-""}
  MAC=${var_mac:-""}
  VLAN=${var_vlan:-""}
  SSH=${var_ssh:-"no"}
  SSH_AUTHORIZED_KEY=${var_ssh_authorized_key:-""}
  UDHCPC_FIX=${var_udhcpc_fix:-""}
  TAGS="community-script;${var_tags:-}"
  ENABLE_FUSE=${var_fuse:-"${1:-no}"}
  ENABLE_TUN=${var_tun:-"${1:-no}"}

  # Since these 2 are only defined outside of default_settings function, we add a temporary fallback. TODO: To align everything, we should add these as constant variables (e.g. OSTYPE and OSVERSION), but that would currently require updating the default_settings function for all existing scripts
  if [ -z "$var_os" ]; then
    var_os="debian"
  fi
  if [ -z "$var_version" ]; then
    var_version="12"
  fi
}

write_config() {
  mkdir -p /opt/community-scripts
  # This function writes the configuration to a file.
  if whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "Write configfile" --yesno "Do you want to write the selections to a config file?" 10 60; then
    FILEPATH="/opt/community-scripts/${NSAPP}.conf"
    [[ "$GATE" =~ ",gw=" ]] && local GATE="${GATE##,gw=}"

    # Strip prefixes from parameters for config file storage
    local SD_VALUE="${SD}"
    local NS_VALUE="${NS}"
    local MAC_VALUE="${MAC}"
    local VLAN_VALUE="${VLAN}"
    [[ "$SD" =~ ^-searchdomain= ]] && SD_VALUE="${SD#-searchdomain=}"
    [[ "$NS" =~ ^-nameserver= ]] && NS_VALUE="${NS#-nameserver=}"
    [[ "$MAC" =~ ^,hwaddr= ]] && MAC_VALUE="${MAC#,hwaddr=}"
    [[ "$VLAN" =~ ^,tag= ]] && VLAN_VALUE="${VLAN#,tag=}"

    if [[ ! -f $FILEPATH ]]; then
      cat <<EOF >"$FILEPATH"
# ${NSAPP} Configuration File
# Generated on $(date)

CT_TYPE="${CT_TYPE}"
DISK_SIZE="${DISK_SIZE}"
CORE_COUNT="${CORE_COUNT}"
RAM_SIZE="${RAM_SIZE}"
VERBOSE="${VERBOSE}"
PW="${PW##-password }"
#CT_ID=$NEXTID
HN="${HN}"
BRG="${BRG}"
NET="${NET}"
IPV6_METHOD="${IPV6_METHOD:-none}"
# Set this only if using "IPV6_METHOD=static"
#IPV6STATIC="fd00::1234/64"

GATE="${GATE:-none}"
APT_CACHER_IP="${APT_CACHER_IP:-none}"
MTU="${MTU:-1500}"
SD="${SD_VALUE:-none}"
NS="${NS_VALUE:-none}"
MAC="${MAC_VALUE:-none}"
VLAN="${VLAN_VALUE:-none}"
SSH="${SSH}"
SSH_AUTHORIZED_KEY="${SSH_AUTHORIZED_KEY}"
TAGS="${TAGS:-none}"
ENABLE_FUSE="$ENABLE_FUSE"
ENABLE_TUN="$ENABLE_TUN"
EOF

      echo -e "${INFO}${BOLD}${GN}Writing configuration to ${FILEPATH}${CL}"
    else
      echo -e "${INFO}${BOLD}${RD}Configuration file already exists at ${FILEPATH}${CL}"
      if whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "Overwrite configfile" --yesno "Do you want to overwrite the existing config file?" 10 60; then
        rm -f "$FILEPATH"
        cat <<EOF >"$FILEPATH"
# ${NSAPP} Configuration File
# Generated on $(date)

CT_TYPE="${CT_TYPE}"
DISK_SIZE="${DISK_SIZE}"
CORE_COUNT="${CORE_COUNT}"
RAM_SIZE="${RAM_SIZE}"
VERBOSE="${VERBOSE}"
PW="${PW##-password }"
#CT_ID=$NEXTID
HN="${HN}"
BRG="${BRG}"
NET="${NET}"
IPV6_METHOD="${IPV6_METHOD:-none}"

# Set this only if using "IPV6_METHOD=static"
#IPV6STATIC="fd00::1234/64"

GATE="${GATE:-none}"
APT_CACHER_IP="${APT_CACHER_IP:-none}"
MTU="${MTU:-1500}"
SD="${SD_VALUE:-none}"
NS="${NS_VALUE:-none}"
MAC="${MAC_VALUE:-none}"
VLAN="${VLAN_VALUE:-none}"
SSH="${SSH}"
SSH_AUTHORIZED_KEY="${SSH_AUTHORIZED_KEY}"
TAGS="${TAGS:-none}"
ENABLE_FUSE="$ENABLE_FUSE"
ENABLE_TUN="$ENABLE_TUN"
EOF
        echo -e "${INFO}${BOLD}${GN}Writing configuration to ${FILEPATH}${CL}"
      else
        echo -e "${INFO}${BOLD}${RD}Configuration file not overwritten${CL}"
      fi
    fi
  fi
}

# This function displays the default values for various settings.
echo_default() {
  # Convert CT_TYPE to description
  CT_TYPE_DESC="Unprivileged"
  if [ "$CT_TYPE" -eq 0 ]; then
    CT_TYPE_DESC="Privileged"
  fi

  # Output the selected values with icons
  echo -e "${CONTAINERID}${BOLD}${DGN}Container ID: ${BGN}${CT_ID}${CL}"
  echo -e "${OS}${BOLD}${DGN}Operating System: ${BGN}$var_os ($var_version)${CL}"
  echo -e "${CONTAINERTYPE}${BOLD}${DGN}Container Type: ${BGN}$CT_TYPE_DESC${CL}"
  echo -e "${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${CL}"
  if [ "$VERBOSE" == "yes" ]; then
    echo -e "${SEARCH}${BOLD}${DGN}Verbose Mode: ${BGN}Enabled${CL}"
  fi
  echo -e "${CREATING}${BOLD}${BL}Creating a ${APP} LXC using the above default settings${CL}"
  echo -e "  "
}

# This function is called when the user decides to exit the script. It clears the screen and displays an exit message.
exit_script() {
  clear
  echo -e "\n${CROSS}${RD}User exited script${CL}\n"
  exit
}

# This function allows the user to configure advanced settings for the script.
advanced_settings() {
  whiptail --backtitle "Proxmox VE Helper Scripts" --msgbox --title "Here is an instructional tip:" "To make a selection, use the Spacebar." 8 58
  # Setting Default Tag for Advanced Settings
  TAGS="community-script;${var_tags:-}"
  CT_DEFAULT_TYPE="${CT_TYPE}"
  CT_TYPE=""
  while [ -z "$CT_TYPE" ]; do
    if [ "$CT_DEFAULT_TYPE" == "1" ]; then
      if CT_TYPE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "CONTAINER TYPE" --radiolist "Choose Type" 10 58 2 \
        "1" "Unprivileged" ON \
        "0" "Privileged" OFF \
        3>&1 1>&2 2>&3); then
        if [ -n "$CT_TYPE" ]; then
          CT_TYPE_DESC="Unprivileged"
          if [ "$CT_TYPE" -eq 0 ]; then
            CT_TYPE_DESC="Privileged"
          fi
          echo -e "${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_DESC${CL}"
        fi
      else
        exit_script
      fi
    fi
    if [ "$CT_DEFAULT_TYPE" == "0" ]; then
      if CT_TYPE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "CONTAINER TYPE" --radiolist "Choose Type" 10 58 2 \
        "1" "Unprivileged" OFF \
        "0" "Privileged" ON \
        3>&1 1>&2 2>&3); then
        if [ -n "$CT_TYPE" ]; then
          CT_TYPE_DESC="Unprivileged"
          if [ "$CT_TYPE" -eq 0 ]; then
            CT_TYPE_DESC="Privileged"
          fi
          echo -e "${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_DESC${CL}"
        fi
      else
        exit_script
      fi
    fi
  done

  while true; do
    if PW1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --passwordbox "\nSet Root Password (needed for root ssh access)" 9 58 --title "PASSWORD (leave blank for automatic login)" 3>&1 1>&2 2>&3); then
      # Empty = Autologin
      if [[ -z "$PW1" ]]; then
        PW=""
        PW1="Automatic Login"
        echo -e "${VERIFYPW}${BOLD}${DGN}Root Password: ${BGN}$PW1${CL}"
        break
      fi

      # Invalid: contains spaces
      if [[ "$PW1" == *" "* ]]; then
        whiptail --msgbox "Password cannot contain spaces." 8 58
        continue
      fi

      # Invalid: too short
      if ((${#PW1} < 5)); then
        whiptail --msgbox "Password must be at least 5 characters." 8 58
        continue
      fi

      # Confirm password
      if PW2=$(whiptail --backtitle "Proxmox VE Helper Scripts" --passwordbox "\nVerify Root Password" 9 58 --title "PASSWORD VERIFICATION" 3>&1 1>&2 2>&3); then
        if [[ "$PW1" == "$PW2" ]]; then
          PW="-password $PW1"
          echo -e "${VERIFYPW}${BOLD}${DGN}Root Password: ${BGN}********${CL}"
          break
        else
          whiptail --msgbox "Passwords do not match. Please try again." 8 58
        fi
      else
        exit_script
      fi
    else
      exit_script
    fi
  done

  if CT_ID=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Container ID" 8 58 "$NEXTID" --title "CONTAINER ID" 3>&1 1>&2 2>&3); then
    if [ -z "$CT_ID" ]; then
      CT_ID="$NEXTID"
      echo -e "${CONTAINERID}${BOLD}${DGN}Container ID: ${BGN}$CT_ID${CL}"
    else
      echo -e "${CONTAINERID}${BOLD}${DGN}Container ID: ${BGN}$CT_ID${CL}"
    fi
  else
    exit_script
  fi

  while true; do
    if CT_NAME=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Hostname" 8 58 "$NSAPP" --title "HOSTNAME" 3>&1 1>&2 2>&3); then
      if [ -z "$CT_NAME" ]; then
        HN="$NSAPP"
      else
        HN=$(echo "${CT_NAME,,}" | tr -d ' ')
      fi
      # Hostname validate (RFC 1123)
      if [[ "$HN" =~ ^[a-z0-9]([-a-z0-9]*[a-z0-9])?$ ]]; then
        echo -e "${HOSTNAME}${BOLD}${DGN}Hostname: ${BGN}$HN${CL}"
        break
      else
        whiptail --backtitle "Proxmox VE Helper Scripts" \
          --msgbox "❌ Invalid hostname: '$HN'\n\nOnly lowercase letters, digits and hyphens (-) are allowed.\nUnderscores (_) or other characters are not permitted!" 10 70
      fi
    else
      exit_script
    fi
  done

  while true; do
    DISK_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Disk Size in GB" 8 58 "$var_disk" --title "DISK SIZE" 3>&1 1>&2 2>&3) || exit_script

    if [ -z "$DISK_SIZE" ]; then
      DISK_SIZE="$var_disk"
    fi

    if [[ "$DISK_SIZE" =~ ^[1-9][0-9]*$ ]]; then
      echo -e "${DISKSIZE}${BOLD}${DGN}Disk Size: ${BGN}${DISK_SIZE} GB${CL}"
      break
    else
      whiptail --msgbox "Disk size must be a positive integer!" 8 58
    fi
  done

  while true; do
    CORE_COUNT=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
      --inputbox "Allocate CPU Cores" 8 58 "$var_cpu" --title "CORE COUNT" 3>&1 1>&2 2>&3) || exit_script

    if [ -z "$CORE_COUNT" ]; then
      CORE_COUNT="$var_cpu"
    fi

    if [[ "$CORE_COUNT" =~ ^[1-9][0-9]*$ ]]; then
      echo -e "${CPUCORE}${BOLD}${DGN}CPU Cores: ${BGN}$CORE_COUNT${CL}"
      break
    else
      whiptail --msgbox "CPU core count must be a positive integer!" 8 58
    fi
  done

  while true; do
    RAM_SIZE=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
      --inputbox "Allocate RAM in MiB" 8 58 "$var_ram" --title "RAM" 3>&1 1>&2 2>&3) || exit_script

    if [ -z "$RAM_SIZE" ]; then
      RAM_SIZE="$var_ram"
    fi

    if [[ "$RAM_SIZE" =~ ^[1-9][0-9]*$ ]]; then
      echo -e "${RAMSIZE}${BOLD}${DGN}RAM Size: ${BGN}${RAM_SIZE} MiB${CL}"
      break
    else
      whiptail --msgbox "RAM size must be a positive integer!" 8 58
    fi
  done

  BRIDGES=""
  IFACE_FILEPATH_LIST="/etc/network/interfaces"$'\n'$(find "/etc/network/interfaces.d/" -type f)
  OLD_IFS=$IFS
  IFS=$'\n'

  for iface_filepath in ${IFACE_FILEPATH_LIST}; do
    iface_indexes_tmpfile=$(mktemp -q -u '.iface-XXXX')

    (grep -Pn '^\s*iface' "${iface_filepath}" | cut -d':' -f1 && wc -l "${iface_filepath}" | cut -d' ' -f1) |
      awk 'FNR==1 {line=$0; next} {print line":"$0-1; line=$0}' >"${iface_indexes_tmpfile}" || true

    if [ -f "${iface_indexes_tmpfile}" ]; then
      while read -r pair; do
        start=$(echo "${pair}" | cut -d':' -f1)
        end=$(echo "${pair}" | cut -d':' -f2)

        if awk "NR >= ${start} && NR <= ${end}" "${iface_filepath}" | grep -qP '^\s*(bridge[-_](ports|stp|fd|vlan-aware|vids)|ovs_type\s+OVSBridge)\b'; then
          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)

  if [[ -z "$BRIDGES" ]]; then
    BRG="vmbr0"
    echo -e "${BRIDGE}${BOLD}${DGN}Bridge: ${BGN}$BRG${CL}"
  else
    BRG=$(whiptail --backtitle "Proxmox VE Helper Scripts" --menu "Select network bridge:" 15 40 6 $(echo "$BRIDGES" | awk '{print $0, "Bridge"}') 3>&1 1>&2 2>&3)
    if [ -z "$BRG" ]; then
      exit_script
    else
      echo -e "${BRIDGE}${BOLD}${DGN}Bridge: ${BGN}$BRG${CL}"
    fi
  fi

  # IPv4 methods: dhcp, static, none
  while true; do
    IPV4_METHOD=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
      --title "IPv4 Address Management" \
      --menu "Select IPv4 Address Assignment Method:" 12 60 2 \
      "dhcp" "Automatic (DHCP, recommended)" \
      "static" "Static (manual entry)" \
      3>&1 1>&2 2>&3)

    exit_status=$?
    if [ $exit_status -ne 0 ]; then
      exit_script
    fi

    case "$IPV4_METHOD" in
    dhcp)
      NET="dhcp"
      GATE=""
      echo -e "${NETWORK}${BOLD}${DGN}IPv4: DHCP${CL}"
      break
      ;;
    static)
      # Static: call and validate CIDR address
      while true; do
        NET=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
          --inputbox "Enter Static IPv4 CIDR Address (e.g. 192.168.100.50/24)" 8 58 "" \
          --title "IPv4 ADDRESS" 3>&1 1>&2 2>&3)
        if [ -z "$NET" ]; then
          whiptail --msgbox "IPv4 address must not be empty." 8 58
          continue
        elif [[ "$NET" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}/([0-9]|[1-2][0-9]|3[0-2])$ ]]; then
          echo -e "${NETWORK}${BOLD}${DGN}IPv4 Address: ${BGN}$NET${CL}"
          break
        else
          whiptail --msgbox "$NET is not a valid IPv4 CIDR address. Please enter a correct value!" 8 58
        fi
      done

      # call and validate Gateway
      while true; do
        GATE1=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
          --inputbox "Enter Gateway IP address for static IPv4" 8 58 "" \
          --title "Gateway IP" 3>&1 1>&2 2>&3)
        if [ -z "$GATE1" ]; then
          whiptail --msgbox "Gateway IP address cannot be empty." 8 58
        elif [[ ! "$GATE1" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then
          whiptail --msgbox "Invalid Gateway IP address format." 8 58
        else
          GATE=",gw=$GATE1"
          echo -e "${GATEWAY}${BOLD}${DGN}Gateway IP Address: ${BGN}$GATE1${CL}"
          break
        fi
      done
      break
      ;;
    esac
  done

  # IPv6 Address Management selection
  while true; do
    IPV6_METHOD=$(whiptail --backtitle "Proxmox VE Helper Scripts" --menu \
      "Select IPv6 Address Management Type:" 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)" \
      --default-item "auto" 3>&1 1>&2 2>&3)
    [ $? -ne 0 ] && exit_script

    case "$IPV6_METHOD" in
    auto)
      echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}SLAAC/AUTO${CL}"
      IPV6_ADDR=""
      IPV6_GATE=""
      break
      ;;
    dhcp)
      echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}DHCPv6${CL}"
      IPV6_ADDR="dhcp"
      IPV6_GATE=""
      break
      ;;
    static)
      # Ask for static IPv6 address (CIDR notation, e.g., 2001:db8::1234/64)
      while true; do
        IPV6_ADDR=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox \
          "Set a static IPv6 CIDR address (e.g., 2001:db8::1234/64)" 8 58 "" \
          --title "IPv6 STATIC ADDRESS" 3>&1 1>&2 2>&3) || exit_script
        if [[ "$IPV6_ADDR" =~ ^([0-9a-fA-F:]+:+)+[0-9a-fA-F]+(/[0-9]{1,3})$ ]]; then
          echo -e "${NETWORK}${BOLD}${DGN}IPv6 Address: ${BGN}$IPV6_ADDR${CL}"
          break
        else
          whiptail --backtitle "Proxmox VE Helper Scripts" --msgbox \
            "$IPV6_ADDR is an invalid IPv6 CIDR address. Please enter a valid IPv6 CIDR address (e.g., 2001:db8::1234/64)" 8 58
        fi
      done
      # Optional: ask for IPv6 gateway for static config
      while true; do
        IPV6_GATE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox \
          "Enter IPv6 gateway address (optional, leave blank for none)" 8 58 "" --title "IPv6 GATEWAY" 3>&1 1>&2 2>&3)
        if [ -z "$IPV6_GATE" ]; then
          IPV6_GATE=""
          break
        elif [[ "$IPV6_GATE" =~ ^([0-9a-fA-F:]+:+)+[0-9a-fA-F]+$ ]]; then
          break
        else
          whiptail --backtitle "Proxmox VE Helper Scripts" --msgbox \
            "Invalid IPv6 gateway format." 8 58

        fi
      done
      break
      ;;
    none)
      echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}None${CL}"
      IPV6_ADDR="none"
      IPV6_GATE=""
      break
      ;;
    disable)
      whiptail --backtitle "Proxmox VE Helper Scripts" --msgbox \
        "⚠️  WARNING - FULLY DISABLE IPv6:\n\nThis will completely disable IPv6 inside the container via sysctl.\n\nSide Effects:\n  • Services requiring IPv6 will fail\n  • Localhost IPv6 (::1) will not work\n  • Some applications may not start\n\nOnly use if you have a specific reason to completely disable IPv6.\n\nFor most use cases, select 'None' instead." 14 70
      echo -e "${NETWORK}${BOLD}${DGN}IPv6: ${BGN}Fully Disabled (IPv6 disabled via sysctl)${CL}"
      IPV6_ADDR="none"
      IPV6_GATE=""
      break
      ;;
    *)
      exit_script
      ;;
    esac
  done

  if [ "$var_os" == "alpine" ]; then
    APT_CACHER=""
    APT_CACHER_IP=""
  else
    if APT_CACHER_IP=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set APT-Cacher IP (leave blank for none)" 8 58 --title "APT-Cacher IP" 3>&1 1>&2 2>&3); then
      APT_CACHER="${APT_CACHER_IP:+yes}"
      echo -e "${NETWORK}${BOLD}${DGN}APT-Cacher IP Address: ${BGN}${APT_CACHER_IP:-Default}${CL}"
    else
      exit_script
    fi
  fi

  if MTU1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Interface MTU Size (leave blank for default [The MTU of your selected vmbr, default is 1500])" 8 58 --title "MTU SIZE" 3>&1 1>&2 2>&3); then
    if [ -z "$MTU1" ]; then
      MTU1="Default"
      MTU=""
    else
      MTU=",mtu=$MTU1"
    fi
    echo -e "${DEFAULT}${BOLD}${DGN}Interface MTU Size: ${BGN}$MTU1${CL}"
  else
    exit_script
  fi

  if SD=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a DNS Search Domain (leave blank for HOST)" 8 58 --title "DNS Search Domain" 3>&1 1>&2 2>&3); then
    if [ -z "$SD" ]; then
      SX=Host
      SD=""
    else
      SX=$SD
      SD="-searchdomain=$SD"
    fi
    echo -e "${SEARCH}${BOLD}${DGN}DNS Search Domain: ${BGN}$SX${CL}"
  else
    exit_script
  fi

  if NX=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a DNS Server IP (leave blank for HOST)" 8 58 --title "DNS SERVER IP" 3>&1 1>&2 2>&3); then
    if [ -z "$NX" ]; then
      NX=Host
      NS=""
    else
      NS="-nameserver=$NX"
    fi
    echo -e "${NETWORK}${BOLD}${DGN}DNS Server IP Address: ${BGN}$NX${CL}"
  else
    exit_script
  fi

  if MAC1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a MAC Address(leave blank for generated MAC)" 8 58 --title "MAC ADDRESS" 3>&1 1>&2 2>&3); then
    if [ -z "$MAC1" ]; then
      MAC1="Default"
      MAC=""
    else
      MAC=",hwaddr=$MAC1"
      echo -e "${MACADDRESS}${BOLD}${DGN}MAC Address: ${BGN}$MAC1${CL}"
    fi
  else
    exit_script
  fi

  if VLAN1=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set a Vlan(leave blank for no VLAN)" 8 58 --title "VLAN" 3>&1 1>&2 2>&3); then
    if [ -z "$VLAN1" ]; then
      VLAN1="Default"
      VLAN=""
    else
      VLAN=",tag=$VLAN1"
    fi
    echo -e "${VLANTAG}${BOLD}${DGN}Vlan: ${BGN}$VLAN1${CL}"
  else
    exit_script
  fi

  if ADV_TAGS=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Custom Tags?[If you remove all, there will be no tags!]" 8 58 "${TAGS}" --title "Advanced Tags" 3>&1 1>&2 2>&3); then
    if [ -n "${ADV_TAGS}" ]; then
      ADV_TAGS=$(echo "$ADV_TAGS" | tr -d '[:space:]')
      TAGS="${ADV_TAGS}"
    else
      TAGS=";"
    fi
    echo -e "${NETWORK}${BOLD}${DGN}Tags: ${BGN}$TAGS${CL}"
  else
    exit_script
  fi

  SSH_AUTHORIZED_KEY="$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "SSH Authorized key for root (leave empty for none)" 8 58 --title "SSH Key" 3>&1 1>&2 2>&3)"

  if [[ -z "${SSH_AUTHORIZED_KEY}" ]]; then
    SSH_AUTHORIZED_KEY=""
  fi

  if [[ "$PW" == -password* || -n "$SSH_AUTHORIZED_KEY" ]]; then
    if (whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "SSH ACCESS" --yesno "Enable Root SSH Access?" 10 58); then
      SSH="yes"
    else
      SSH="no"
    fi
    echo -e "${ROOTSSH}${BOLD}${DGN}Root SSH Access: ${BGN}$SSH${CL}"
  else
    SSH="no"
    echo -e "${ROOTSSH}${BOLD}${DGN}Root SSH Access: ${BGN}$SSH${CL}"
  fi

  if (whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "FUSE Support" --yesno "Enable FUSE support?\nRequired for tools like rclone, mergerfs, AppImage, etc." 10 58); then
    ENABLE_FUSE="yes"
  else
    ENABLE_FUSE="no"
  fi
  echo -e "${FUSE}${BOLD}${DGN}Enable FUSE Support: ${BGN}$ENABLE_FUSE${CL}"

  if (whiptail --backtitle "Proxmox VE Helper Scripts" --defaultno --title "VERBOSE MODE" --yesno "Enable Verbose Mode?" 10 58); then
    VERBOSE="yes"
  else
    VERBOSE="no"
  fi
  echo -e "${SEARCH}${BOLD}${DGN}Verbose Mode: ${BGN}$VERBOSE${CL}"

  if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "ADVANCED SETTINGS COMPLETE" --yesno "Ready to create ${APP} LXC?" 10 58); then
    echo -e "${CREATING}${BOLD}${RD}Creating a ${APP} LXC using the above advanced settings${CL}"

    # Strip prefixes from DNS parameters for config file storage
    local SD_VALUE="$SD"
    local NS_VALUE="$NS"
    local MAC_VALUE="$MAC"
    local VLAN_VALUE="$VLAN"
    [[ "$SD" =~ ^-searchdomain= ]] && SD_VALUE="${SD#-searchdomain=}"
    [[ "$NS" =~ ^-nameserver= ]] && NS_VALUE="${NS#-nameserver=}"
    [[ "$MAC" =~ ^,hwaddr= ]] && MAC_VALUE="${MAC#,hwaddr=}"
    [[ "$VLAN" =~ ^,tag= ]] && VLAN_VALUE="${VLAN#,tag=}"

    # Temporarily store original values
    local SD_ORIG="$SD"
    local NS_ORIG="$NS"
    local MAC_ORIG="$MAC"
    local VLAN_ORIG="$VLAN"

    # Set clean values for config file writing
    SD="$SD_VALUE"
    NS="$NS_VALUE"
    MAC="$MAC_VALUE"
    VLAN="$VLAN_VALUE"

    write_config

    # Restore original formatted values for container creation
    SD="$SD_ORIG"
    NS="$NS_ORIG"
    MAC="$MAC_ORIG"
    VLAN="$VLAN_ORIG"
  else
    clear
    header_info
    echo -e "${ADVANCED}${BOLD}${RD}Using Advanced Settings on node $PVEHOST_NAME${CL}"
    advanced_settings
  fi
}

diagnostics_check() {
  if ! [ -d "/usr/local/community-scripts" ]; then
    mkdir -p /usr/local/community-scripts
  fi

  if ! [ -f "/usr/local/community-scripts/diagnostics" ]; then
    if (whiptail --backtitle "Proxmox VE Helper Scripts" --title "DIAGNOSTICS" --yesno "Send Diagnostics of LXC Installation?\n\n(This only transmits data without user data, just RAM, CPU, LXC name, ...)" 10 58); then
      cat <<EOF >/usr/local/community-scripts/diagnostics
DIAGNOSTICS=yes

#This file is used to store the diagnostics settings for the Community-Scripts API.
#https://github.com/community-scripts/ProxmoxVE/discussions/1836
#Your diagnostics will be sent to the Community-Scripts API for troubleshooting/statistical purposes.
#You can review the data at https://community-scripts.github.io/ProxmoxVE/data
#If you do not wish to send diagnostics, please set the variable 'DIAGNOSTICS' to "no" in /usr/local/community-scripts/diagnostics, or use the menue.
#This will disable the diagnostics feature.
#To send diagnostics, set the variable 'DIAGNOSTICS' to "yes" in /usr/local/community-scripts/diagnostics, or use the menue.
#This will enable the diagnostics feature.
#The following information will be sent:
#"ct_type"
#"disk_size"
#"core_count"
#"ram_size"
#"os_type"
#"os_version"
#"nsapp"
#"method"
#"pve_version"
#"status"
#If you have any concerns, please review the source code at /misc/build.func
EOF
      DIAGNOSTICS="yes"
    else
      cat <<EOF >/usr/local/community-scripts/diagnostics
DIAGNOSTICS=no

#This file is used to store the diagnostics settings for the Community-Scripts API.
#https://github.com/community-scripts/ProxmoxVE/discussions/1836
#Your diagnostics will be sent to the Community-Scripts API for troubleshooting/statistical purposes.
#You can review the data at https://community-scripts.github.io/ProxmoxVE/data
#If you do not wish to send diagnostics, please set the variable 'DIAGNOSTICS' to "no" in /usr/local/community-scripts/diagnostics, or use the menue.
#This will disable the diagnostics feature.
#To send diagnostics, set the variable 'DIAGNOSTICS' to "yes" in /usr/local/community-scripts/diagnostics, or use the menue.
#This will enable the diagnostics feature.
#The following information will be sent:
#"ct_type"
#"disk_size"
#"core_count"
#"ram_size"
#"os_type"
#"os_version"
#"nsapp"
#"method"
#"pve_version"
#"status"
#If you have any concerns, please review the source code at /misc/build.func
EOF
      DIAGNOSTICS="no"
    fi
  else
    DIAGNOSTICS=$(awk -F '=' '/^DIAGNOSTICS/ {print $2}' /usr/local/community-scripts/diagnostics)

  fi

}

install_script() {
  pve_check
  shell_check
  root_check
  arch_check
  ssh_check
  maxkeys_check
  diagnostics_check

  if systemctl is-active -q ping-instances.service; then
    systemctl -q stop ping-instances.service
  fi
  NEXTID=$(pvesh get /cluster/nextid)
  # Read timezone - fallback for Debian 13/Proxmox 9+ where /etc/timezone doesn't exist
  if [[ -f /etc/timezone ]]; then
    timezone=$(cat /etc/timezone)
  else
    timezone=$(timedatectl show --value --property=Timezone 2>/dev/null || echo "UTC")
  fi
  header_info
  while true; do

    TMP_CHOICE=$(whiptail --backtitle "Proxmox VE Helper Scripts" \
      --title "SETTINGS" \
      --menu "Choose an option:" 20 60 6 \
      "1" "Default Settings" \
      "2" "Default Settings (with verbose)" \
      "3" "Advanced Settings" \
      "4" "Use Config File" \
      "5" "Diagnostic Settings" \
      "6" "Exit" \
      --default-item "1" 3>&1 1>&2 2>&3) || true

    if [ -z "$TMP_CHOICE" ]; then
      echo -e "\n${CROSS}${RD}Menu canceled. Exiting script.${CL}\n"
      exit 0
    fi

    CHOICE="$TMP_CHOICE"

    case $CHOICE in
    1)
      header_info
      echo -e "${DEFAULT}${BOLD}${BL}Using Default Settings on node $PVEHOST_NAME${CL}"
      VERBOSE="no"
      METHOD="default"
      base_settings "$VERBOSE"
      echo_default
      break
      ;;
    2)
      header_info
      echo -e "${DEFAULT}${BOLD}${BL}Using Default Settings on node $PVEHOST_NAME (${VERBOSE_CROPPED}Verbose)${CL}"
      VERBOSE="yes"
      METHOD="default"
      base_settings "$VERBOSE"
      echo_default
      break
      ;;
    3)
      header_info
      echo -e "${ADVANCED}${BOLD}${RD}Using Advanced Settings on node $PVEHOST_NAME${CL}"
      METHOD="advanced"
      base_settings
      advanced_settings
      break
      ;;
    4)
      header_info
      echo -e "${INFO}${HOLD} ${GN}Using Config File on node $PVEHOST_NAME${CL}"
      METHOD="config_file"
      source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/config-file.func)
      config_file
      break
      ;;
    5)
      if [[ $DIAGNOSTICS == "yes" ]]; then
        if whiptail --backtitle "Proxmox VE Helper Scripts" --title "DIAGNOSTICS SETTINGS" --yesno "Send Diagnostics of LXC Installation?\n\nCurrent setting: ${DIAGNOSTICS}" 10 58 \
          --yes-button "No" --no-button "Back"; then
          DIAGNOSTICS="no"
          sed -i 's/^DIAGNOSTICS=.*/DIAGNOSTICS=no/' /usr/local/community-scripts/diagnostics
          whiptail --backtitle "Proxmox VE Helper Scripts" --title "DIAGNOSTICS SETTINGS" --msgbox "Diagnostics settings changed to ${DIAGNOSTICS}." 8 58
        fi
      else
        if whiptail --backtitle "Proxmox VE Helper Scripts" --title "DIAGNOSTICS SETTINGS" --yesno "Send Diagnostics of LXC Installation?\n\nCurrent setting: ${DIAGNOSTICS}" 10 58 \
          --yes-button "Yes" --no-button "Back"; then
          DIAGNOSTICS="yes"
          sed -i 's/^DIAGNOSTICS=.*/DIAGNOSTICS=yes/' /usr/local/community-scripts/diagnostics
          whiptail --backtitle "Proxmox VE Helper Scripts" --title "DIAGNOSTICS SETTINGS" --msgbox "Diagnostics settings changed to ${DIAGNOSTICS}." 8 58
        fi
      fi

      ;;
    6)
      echo -e "\n${CROSS}${RD}Script terminated. Have a great day!${CL}\n"
      exit 0
      ;;
    *)
      echo -e "\n${CROSS}${RD}Invalid option, please try again.${CL}\n"
      ;;
    esac
  done
}

check_container_resources() {
  # Check actual RAM & Cores
  current_ram=$(free -m | awk 'NR==2{print $2}')
  current_cpu=$(nproc)

  # Check whether the current RAM is less than the required RAM or the CPU cores are less than required
  if [[ "$current_ram" -lt "$var_ram" ]] || [[ "$current_cpu" -lt "$var_cpu" ]]; then
    echo -e "\n${INFO}${HOLD} ${GN}Required: ${var_cpu} CPU, ${var_ram}MB RAM ${CL}| ${RD}Current: ${current_cpu} CPU, ${current_ram}MB RAM${CL}"
    echo -e "${YWB}Please ensure that the ${APP} LXC is configured with at least ${var_cpu} vCPU and ${var_ram} MB RAM for the build process.${CL}\n"
    echo -ne "${INFO}${HOLD} May cause data loss! ${INFO} Continue update with under-provisioned LXC? [y/N] "
    read -r prompt
    if [[ ! "${prompt,,}" =~ ^(y|yes)$ ]]; then
      echo -e "${CROSS}${HOLD} ${YWB}Exiting based on user input.${CL}"
      exit 1
    fi
  else
    echo -e ""
  fi
}

check_container_storage() {
  # Check if the /boot partition is more than 80% full
  total_size=$(df /boot --output=size | tail -n 1)
  local used_size=$(df /boot --output=used | tail -n 1)
  usage=$((100 * used_size / total_size))
  if ((usage > 80)); then
    # Prompt the user for confirmation to continue
    echo -e "${INFO}${HOLD} ${YWB}Warning: Storage is dangerously low (${usage}%).${CL}"
    echo -ne "Continue anyway? [y/N] "
    read -r prompt
    if [[ ! "${prompt,,}" =~ ^(y|yes)$ ]]; then
      echo -e "${CROSS}${HOLD}${YWB}Exiting based on user input.${CL}"
      exit 1
    fi
  fi
}

start() {
  source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/tools.func)
  if command -v pveversion >/dev/null 2>&1; then
    install_script
  else
    CHOICE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "${APP} LXC Update/Setting" --menu \
      "Support/Update functions for ${APP} LXC. Choose an option:" \
      12 60 3 \
      "1" "YES (Silent Mode)" \
      "2" "YES (Verbose Mode)" \
      "3" "NO (Cancel Update)" --nocancel --default-item "1" 3>&1 1>&2 2>&3)

    case "$CHOICE" in
    1)
      VERBOSE="no"
      set_std_mode
      ;;
    2)
      VERBOSE="yes"
      set_std_mode
      ;;
    3)
      clear
      exit_script
      exit
      ;;
    esac
    update_script
    cleanup_lxc
  fi
}

# This function collects user settings and integrates all the collected information.
build_container() {
  #  if [ "$VERBOSE" == "yes" ]; then set -x; fi

  NET_STRING="-net0 name=eth0,bridge=$BRG$MAC,ip=$NET$GATE$VLAN$MTU"
  case "$IPV6_METHOD" in
  auto) NET_STRING="$NET_STRING,ip6=auto" ;;
  dhcp) NET_STRING="$NET_STRING,ip6=dhcp" ;;
  static)
    NET_STRING="$NET_STRING,ip6=$IPV6_ADDR"
    [ -n "$IPV6_GATE" ] && NET_STRING="$NET_STRING,gw6=$IPV6_GATE"
    ;;
  none) ;;
  esac
  if [ "$CT_TYPE" == "1" ]; then
    FEATURES="keyctl=1,nesting=1"
  else
    FEATURES="nesting=1"
  fi

  if [ "$ENABLE_FUSE" == "yes" ]; then
    FEATURES="$FEATURES,fuse=1"
  fi

  if [[ $DIAGNOSTICS == "yes" ]]; then
    post_to_api
  fi

  TEMP_DIR=$(mktemp -d)
  pushd "$TEMP_DIR" >/dev/null
  if [ "$var_os" == "alpine" ]; then
    export FUNCTIONS_FILE_PATH="$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/alpine-install.func)"
  else
    export FUNCTIONS_FILE_PATH="$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/install.func)"
  fi

  export DIAGNOSTICS="$DIAGNOSTICS"
  export RANDOM_UUID="$RANDOM_UUID"
  export CACHER="$APT_CACHER"
  export CACHER_IP="$APT_CACHER_IP"
  export tz="$timezone"
  export APPLICATION="$APP"
  export app="$NSAPP"
  export PASSWORD="$PW"
  export VERBOSE="$VERBOSE"
  export SSH_ROOT="${SSH}"
  export SSH_AUTHORIZED_KEY
  export CTID="$CT_ID"
  export CTTYPE="$CT_TYPE"
  export ENABLE_FUSE="$ENABLE_FUSE"
  export ENABLE_TUN="$ENABLE_TUN"
  export PCT_OSTYPE="$var_os"
  export PCT_OSVERSION="$var_version"
  export PCT_DISK_SIZE="$DISK_SIZE"
  export PCT_OPTIONS="
    -features $FEATURES
    -hostname $HN
    -tags $TAGS
    $SD
    $NS
    $NET_STRING
    -onboot 1
    -cores $CORE_COUNT
    -memory $RAM_SIZE
    -unprivileged $CT_TYPE
    $PW
  "
  # This executes create_lxc.sh and creates the container and .conf file
  bash -c "$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/create_lxc.sh)" $?

  LXC_CONFIG="/etc/pve/lxc/${CTID}.conf"

  # USB passthrough for privileged LXC (CT_TYPE=0)
  if [ "$CT_TYPE" == "0" ]; then
    cat <<EOF >>"$LXC_CONFIG"
# USB passthrough
lxc.cgroup2.devices.allow: a
lxc.cap.drop:
lxc.cgroup2.devices.allow: c 188:* rwm
lxc.cgroup2.devices.allow: c 189:* rwm
lxc.mount.entry: /dev/serial/by-id  dev/serial/by-id  none bind,optional,create=dir
lxc.mount.entry: /dev/ttyUSB0       dev/ttyUSB0       none bind,optional,create=file
lxc.mount.entry: /dev/ttyUSB1       dev/ttyUSB1       none bind,optional,create=file
lxc.mount.entry: /dev/ttyACM0       dev/ttyACM0       none bind,optional,create=file
lxc.mount.entry: /dev/ttyACM1       dev/ttyACM1       none bind,optional,create=file
EOF
  fi

  # VAAPI passthrough for privileged containers or known apps
  VAAPI_APPS=(
    "immich"
    "Channels"
    "Emby"
    "ErsatzTV"
    "Frigate"
    "Jellyfin"
    "Plex"
    "Scrypted"
    "Tdarr"
    "Unmanic"
    "Ollama"
    "FileFlows"
    "Open WebUI"
  )

  is_vaapi_app=false
  for vaapi_app in "${VAAPI_APPS[@]}"; do
    if [[ "$APP" == "$vaapi_app" ]]; then
      is_vaapi_app=true
      break
    fi
  done

  if ([ "$CT_TYPE" == "0" ] || [ "$is_vaapi_app" == "true" ]) &&
    ([[ -e /dev/dri/renderD128 ]] || [[ -e /dev/dri/card0 ]] || [[ -e /dev/fb0 ]]); then

    echo ""
    msg_custom "⚙️ " "\e[96m" "Configuring VAAPI passthrough for LXC container"
    if [ "$CT_TYPE" != "0" ]; then
      msg_custom "⚠️ " "\e[33m" "Container is unprivileged – VAAPI passthrough may not work without additional host configuration (e.g., idmap)."
    fi
    msg_custom "ℹ️ " "\e[96m" "VAAPI enables GPU hardware acceleration (e.g., for video transcoding in Jellyfin or Plex)."
    echo ""
    read -rp "➤ Automatically mount all available VAAPI devices? [Y/n]: " VAAPI_ALL

    if [[ "$VAAPI_ALL" =~ ^[Yy]$|^$ ]]; then
      if [ "$CT_TYPE" == "0" ]; then
        # PRV Container → alles zulässig
        [[ -e /dev/dri/renderD128 ]] && {
          echo "lxc.cgroup2.devices.allow: c 226:128 rwm" >>"$LXC_CONFIG"
          echo "lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file" >>"$LXC_CONFIG"
        }
        [[ -e /dev/dri/card0 ]] && {
          echo "lxc.cgroup2.devices.allow: c 226:0 rwm" >>"$LXC_CONFIG"
          echo "lxc.mount.entry: /dev/dri/card0 dev/dri/card0 none bind,optional,create=file" >>"$LXC_CONFIG"
        }
        [[ -e /dev/fb0 ]] && {
          echo "lxc.cgroup2.devices.allow: c 29:0 rwm" >>"$LXC_CONFIG"
          echo "lxc.mount.entry: /dev/fb0 dev/fb0 none bind,optional,create=file" >>"$LXC_CONFIG"
        }
        [[ -d /dev/dri ]] && {
          echo "lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir" >>"$LXC_CONFIG"
        }
      else
        # UNPRV Container → nur devX für UI
        [[ -e /dev/dri/card0 ]] && echo "dev0: /dev/dri/card0,gid=44" >>"$LXC_CONFIG"
        [[ -e /dev/dri/card1 ]] && echo "dev0: /dev/dri/card1,gid=44" >>"$LXC_CONFIG"
        [[ -e /dev/dri/renderD128 ]] && echo "dev1: /dev/dri/renderD128,gid=104" >>"$LXC_CONFIG"
      fi
    fi

  fi
  if [ "$CT_TYPE" == "1" ] && [ "$is_vaapi_app" == "true" ]; then
    if [[ -e /dev/dri/card0 ]]; then
      echo "dev0: /dev/dri/card0,gid=44" >>"$LXC_CONFIG"
    elif [[ -e /dev/dri/card1 ]]; then
      echo "dev0: /dev/dri/card1,gid=44" >>"$LXC_CONFIG"
    fi
    if [[ -e /dev/dri/renderD128 ]]; then
      echo "dev1: /dev/dri/renderD128,gid=104" >>"$LXC_CONFIG"
    fi
  fi

  # TUN device passthrough
  if [ "$ENABLE_TUN" == "yes" ]; then
    cat <<EOF >>"$LXC_CONFIG"
lxc.cgroup2.devices.allow: c 10:200 rwm
lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file
EOF
  fi

  # This starts the container and executes <app>-install.sh
  msg_info "Starting LXC Container"
  pct start "$CTID"

  # wait for status 'running'
  for i in {1..10}; do
    if pct status "$CTID" | grep -q "status: running"; then
      msg_ok "Started LXC Container"
      break
    fi
    sleep 1
    if [ "$i" -eq 10 ]; then
      msg_error "LXC Container did not reach running state"
      exit 1
    fi
  done

  if [ "$var_os" != "alpine" ]; then
    msg_info "Waiting for network in LXC container"
    for i in {1..10}; do
      # 1. Primary check: ICMP ping (fastest, but may be blocked by ISP/firewall)
      if pct exec "$CTID" -- ping -c1 -W1 deb.debian.org >/dev/null 2>&1; then
        msg_ok "Network in LXC is reachable (ping)"
        break
      fi
      # Wait and retry if not reachable yet
      if [ "$i" -lt 10 ]; then
        msg_warn "No network in LXC yet (try $i/10) – waiting..."
        sleep 3
      else
        # After 10 unsuccessful ping attempts, try HTTP connectivity via wget as fallback
        msg_warn "Ping failed 10 times. Trying HTTP connectivity check (wget) as fallback..."
        if pct exec "$CTID" -- wget -q --spider http://deb.debian.org; then
          msg_ok "Network in LXC is reachable (wget fallback)"
        else
          msg_error "No network in LXC after all checks."
          read -r -p "Set fallback DNS (1.1.1.1/8.8.8.8)? [y/N]: " choice
          case "$choice" in
          [yY]*)
            pct set "$CTID" --nameserver 1.1.1.1
            pct set "$CTID" --nameserver 8.8.8.8
            # Final attempt with wget after DNS change
            if pct exec "$CTID" -- wget -q --spider http://deb.debian.org; then
              msg_ok "Network reachable after DNS fallback"
            else
              msg_error "Still no network/DNS in LXC! Aborting customization."
              exit_script
            fi
            ;;
          *)
            msg_error "Aborted by user – no DNS fallback set."
            exit_script
            ;;
          esac
        fi
        break
      fi
    done
  fi

  msg_info "Customizing LXC Container"
  : "${tz:=Etc/UTC}"
  if [ "$var_os" == "alpine" ]; then
    sleep 3
    pct exec "$CTID" -- /bin/sh -c 'cat <<EOF >/etc/apk/repositories
http://dl-cdn.alpinelinux.org/alpine/latest-stable/main
http://dl-cdn.alpinelinux.org/alpine/latest-stable/community
EOF'
    pct exec "$CTID" -- ash -c "apk add bash newt curl openssh nano mc ncurses jq >/dev/null"
  else
    sleep 3
    LANG=${LANG:-en_US.UTF-8}
    pct exec "$CTID" -- bash -c "sed -i \"/$LANG/ s/^# //\" /etc/locale.gen"
    pct exec "$CTID" -- bash -c "locale_line=\$(grep -v '^#' /etc/locale.gen | grep -E '^[a-zA-Z]' | awk '{print \$1}' | head -n 1) && \
    echo LANG=\$locale_line >/etc/default/locale && \
    locale-gen >/dev/null && \
    export LANG=\$locale_line"

    if [[ -z "${tz:-}" ]]; then
      tz=$(timedatectl show --property=Timezone --value 2>/dev/null || echo "Etc/UTC")
    fi
    if pct exec "$CTID" -- test -e "/usr/share/zoneinfo/$tz"; then
      pct exec "$CTID" -- bash -c "tz='$tz'; echo \"\$tz\" >/etc/timezone && ln -sf \"/usr/share/zoneinfo/\$tz\" /etc/localtime"
    else
      msg_warn "Skipping timezone setup – zone '$tz' not found in container"
    fi

    pct exec "$CTID" -- bash -c "apt-get update >/dev/null && apt-get install -y sudo curl mc gnupg2 jq >/dev/null"
  fi
  msg_ok "Customized LXC Container"

  lxc-attach -n "$CTID" -- bash -c "$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/install/${var_install}.sh)"
}

# This function sets the description of the container.
description() {
  IP=$(pct exec "$CTID" ip a s dev eth0 | awk '/inet / {print $2}' | cut -d/ -f1)

  # Generate LXC Description
  DESCRIPTION=$(
    cat <<EOF
<div align='center'>
  <a href='https://Helper-Scripts.com' target='_blank' rel='noopener noreferrer'>
    <img src='https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/images/logo-81x112.png' alt='Logo' style='width:81px;height:112px;'/>
  </a>

  <h2 style='font-size: 24px; margin: 20px 0;'>${APP} LXC</h2>

  <p style='margin: 16px 0;'>
    <a href='https://ko-fi.com/community_scripts' target='_blank' rel='noopener noreferrer'>
      <img src='https://img.shields.io/badge/&#x2615;-Buy us a coffee-blue' alt='spend Coffee' />
    </a>
  </p>

  <span style='margin: 0 10px;'>
    <i class="fa fa-github fa-fw" style="color: #f5f5f5;"></i>
    <a href='https://github.com/community-scripts/ProxmoxVE' target='_blank' rel='noopener noreferrer' style='text-decoration: none; color: #00617f;'>GitHub</a>
  </span>
  <span style='margin: 0 10px;'>
    <i class="fa fa-comments fa-fw" style="color: #f5f5f5;"></i>
    <a href='https://github.com/community-scripts/ProxmoxVE/discussions' target='_blank' rel='noopener noreferrer' style='text-decoration: none; color: #00617f;'>Discussions</a>
  </span>
  <span style='margin: 0 10px;'>
    <i class="fa fa-exclamation-circle fa-fw" style="color: #f5f5f5;"></i>
    <a href='https://github.com/community-scripts/ProxmoxVE/issues' target='_blank' rel='noopener noreferrer' style='text-decoration: none; color: #00617f;'>Issues</a>
  </span>
</div>
EOF
  )

  # Set Description in LXC
  pct set "$CTID" -description "$DESCRIPTION"

  if [[ -f /etc/systemd/system/ping-instances.service ]]; then
    systemctl start ping-instances.service
  fi

  post_update_to_api "done" "none"
}

api_exit_script() {
  exit_code=$? # Capture the exit status of the last executed command
  #200 exit codes indicate error in create_lxc.sh
  #100 exit codes indicate error in install.func

  if [ $exit_code -ne 0 ]; then
    case $exit_code in
    100) post_update_to_api "failed" "100: Unexpected error in create_lxc.sh" ;;
    101) post_update_to_api "failed" "101: No network connection detected in create_lxc.sh" ;;
    200) post_update_to_api "failed" "200: LXC creation failed in create_lxc.sh" ;;
    201) post_update_to_api "failed" "201: Invalid Storage class in create_lxc.sh" ;;
    202) post_update_to_api "failed" "202: User aborted menu in create_lxc.sh" ;;
    203) post_update_to_api "failed" "203: CTID not set in create_lxc.sh" ;;
    204) post_update_to_api "failed" "204: PCT_OSTYPE not set in create_lxc.sh" ;;
    205) post_update_to_api "failed" "205: CTID cannot be less than 100 in create_lxc.sh" ;;
    206) post_update_to_api "failed" "206: CTID already in use in create_lxc.sh" ;;
    207) post_update_to_api "failed" "207: Template not found in create_lxc.sh" ;;
    208) post_update_to_api "failed" "208: Error downloading template in create_lxc.sh" ;;
    209) post_update_to_api "failed" "209: Container creation failed, but template is intact in create_lxc.sh" ;;
    *) post_update_to_api "failed" "Unknown error, exit code: $exit_code in create_lxc.sh" ;;
    esac
  fi
}

if command -v pveversion >/dev/null 2>&1; then
  trap 'api_exit_script' EXIT
fi
trap 'post_update_to_api "failed" "$BASH_COMMAND"' ERR
trap 'post_update_to_api "failed" "INTERRUPTED"' SIGINT
trap 'post_update_to_api "failed" "TERMINATED"' SIGTERM
