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

# ==============================================================================
# CORE FUNCTIONS - LXC CONTAINER UTILITIES
# ==============================================================================
#
# This file provides core utility functions for LXC container management
# including colors, formatting, validation checks, message output, and
# execution helpers used throughout the Community-Scripts ecosystem.
#
# Usage:
#   source <(curl -fsSL https://git.community-scripts.org/.../core.func)
#   load_functions
#
# ==============================================================================

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

# ==============================================================================
# SECTION 1: INITIALIZATION & SETUP
# ==============================================================================

# ------------------------------------------------------------------------------
# load_functions()
#
# - Initializes all core utility groups (colors, formatting, icons, defaults)
# - Ensures functions are loaded only once via __FUNCTIONS_LOADED flag
# - Must be called at start of any script using these utilities
# ------------------------------------------------------------------------------
load_functions() {
	[[ -n "${__FUNCTIONS_LOADED:-}" ]] && return
	__FUNCTIONS_LOADED=1
	color
	formatting
	icons
	default_vars
	set_std_mode
}

# ------------------------------------------------------------------------------
# color()
#
# - Sets ANSI color codes for styled terminal output
# - Variables: YW (yellow), YWB (yellow bright), BL (blue), RD (red)
#             GN (green), DGN (dark green), BGN (background green), CL (clear)
# ------------------------------------------------------------------------------
color() {
	YW=$(echo "\033[33m")
	YWB=$'\e[93m'
	BL=$(echo "\033[36m")
	RD=$(echo "\033[01;31m")
	BGN=$(echo "\033[4;92m")
	GN=$(echo "\033[1;92m")
	DGN=$(echo "\033[32m")
	CL=$(echo "\033[m")
}

# ------------------------------------------------------------------------------
# color_spinner()
#
# - Sets ANSI color codes specifically for spinner animation
# - Variables: CS_YW (spinner yellow), CS_YWB (spinner yellow bright),
#             CS_CL (spinner clear)
# - Used by spinner() function to avoid color conflicts
# ------------------------------------------------------------------------------
color_spinner() {
	CS_YW=$'\033[33m'
	CS_YWB=$'\033[93m'
	CS_CL=$'\033[m'
}

# ------------------------------------------------------------------------------
# formatting()
#
# - Defines formatting helpers for terminal output
# - BFR: Backspace and clear line sequence
# - BOLD: Bold text escape code
# - TAB/TAB3: Indentation spacing
# ------------------------------------------------------------------------------
formatting() {
	BFR="\\r\\033[K"
	BOLD=$(echo "\033[1m")
	HOLD=" "
	TAB="  "
	TAB3="      "
}

# ------------------------------------------------------------------------------
# icons()
#
# - Sets symbolic emoji icons used throughout user feedback
# - Provides consistent visual indicators for success, error, info, etc.
# - Icons: CM (checkmark), CROSS (error), INFO (info), HOURGLASS (wait), etc.
# ------------------------------------------------------------------------------
icons() {
	CM="${TAB}✔️${TAB}"
	CROSS="${TAB}✖️${TAB}"
	DNSOK="✔️ "
	DNSFAIL="${TAB}✖️${TAB}"
	INFO="${TAB}💡${TAB}${CL}"
	OS="${TAB}🖥️${TAB}${CL}"
	OSVERSION="${TAB}🌟${TAB}${CL}"
	CONTAINERTYPE="${TAB}📦${TAB}${CL}"
	DISKSIZE="${TAB}💾${TAB}${CL}"
	CPUCORE="${TAB}🧠${TAB}${CL}"
	RAMSIZE="${TAB}🛠️${TAB}${CL}"
	SEARCH="${TAB}🔍${TAB}${CL}"
	VERBOSE_CROPPED="🔍${TAB}"
	VERIFYPW="${TAB}🔐${TAB}${CL}"
	CONTAINERID="${TAB}🆔${TAB}${CL}"
	HOSTNAME="${TAB}🏠${TAB}${CL}"
	BRIDGE="${TAB}🌉${TAB}${CL}"
	NETWORK="${TAB}📡${TAB}${CL}"
	GATEWAY="${TAB}🌐${TAB}${CL}"
	ICON_DISABLEIPV6="${TAB}🚫${TAB}${CL}"
	DEFAULT="${TAB}⚙️${TAB}${CL}"
	MACADDRESS="${TAB}🔗${TAB}${CL}"
	VLANTAG="${TAB}🏷️${TAB}${CL}"
	ROOTSSH="${TAB}🔑${TAB}${CL}"
	CREATING="${TAB}🚀${TAB}${CL}"
	ADVANCED="${TAB}🧩${TAB}${CL}"
	FUSE="${TAB}🗂️${TAB}${CL}"
	GPU="${TAB}🎮${TAB}${CL}"
	HOURGLASS="${TAB}⏳${TAB}"
}

# ------------------------------------------------------------------------------
# ensure_profile_loaded()
#
# - Sources /etc/profile.d/*.sh scripts if not already loaded
# - Fixes PATH issues when running via pct enter/exec (non-login shells)
# - Safe to call multiple times (uses guard variable)
# - Should be called in update_script() or any script running inside LXC
# ------------------------------------------------------------------------------
ensure_profile_loaded() {
	# Skip if already loaded or running on Proxmox host
	[[ -n "${_PROFILE_LOADED:-}" ]] && return
	command -v pveversion &>/dev/null && return

	# Source all profile.d scripts to ensure PATH is complete.
	# Redirect stdout to suppress banner/MOTD output (e.g. 00_lxc-details.sh)
	# while still allowing env/PATH exports to take effect.
	if [[ -d /etc/profile.d ]]; then
		for script in /etc/profile.d/*.sh; do
			[[ -r "$script" ]] && source "$script" >/dev/null || true
		done
	fi

	# Also ensure /usr/local/bin is in PATH (common install location)
	if [[ ":$PATH:" != *":/usr/local/bin:"* ]]; then
		export PATH="/usr/local/bin:$PATH"
	fi

	export _PROFILE_LOADED=1
}

# ------------------------------------------------------------------------------
# default_vars()
#
# - Sets default retry and wait variables used for system actions
# - RETRY_NUM: Maximum number of retry attempts (default: 10)
# - RETRY_EVERY: Seconds to wait between retries (default: 3)
# - i: Counter variable initialized to RETRY_NUM
# ------------------------------------------------------------------------------
default_vars() {
	RETRY_NUM=10
	RETRY_EVERY=3
	i=$RETRY_NUM
}

# ------------------------------------------------------------------------------
# set_std_mode()
#
# - Sets default verbose mode for script and OS execution
# - If VERBOSE=yes: STD="" (show all output)
# - If VERBOSE=no: STD="silent" (suppress output via silent() wrapper)
# - If DEV_MODE_TRACE=true: Enables bash tracing (set -x)
# ------------------------------------------------------------------------------
set_std_mode() {
	if [ "${VERBOSE:-no}" = "yes" ]; then
		STD=""
	else
		STD="silent"
	fi

	# Enable bash tracing if trace mode active
	if [[ "${DEV_MODE_TRACE:-false}" == "true" ]]; then
		set -x
		export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
	fi
}

# ------------------------------------------------------------------------------
# parse_dev_mode()
#
# - Parses comma-separated dev_mode variable (e.g., "motd,keep,trace")
# - Sets global flags for each mode:
#   * DEV_MODE_MOTD: Setup SSH/MOTD before installation
#   * DEV_MODE_KEEP: Never delete container on failure
#   * DEV_MODE_TRACE: Enable bash set -x tracing
#   * DEV_MODE_PAUSE: Pause after each msg_info step
#   * DEV_MODE_BREAKPOINT: Open shell on error instead of cleanup
#   * DEV_MODE_LOGS: Persist all logs to /var/log/community-scripts/
#   * DEV_MODE_DRYRUN: Show commands without executing
# - Call this early in script execution
# ------------------------------------------------------------------------------
parse_dev_mode() {
	local mode
	# Initialize all flags to false
	export DEV_MODE_MOTD=false
	export DEV_MODE_KEEP=false
	export DEV_MODE_TRACE=false
	export DEV_MODE_PAUSE=false
	export DEV_MODE_BREAKPOINT=false
	export DEV_MODE_LOGS=false
	export DEV_MODE_DRYRUN=false

	# Parse comma-separated modes
	if [[ -n "${dev_mode:-}" ]]; then
		IFS=',' read -ra MODES <<<"$dev_mode"
		for mode in "${MODES[@]}"; do
			mode="$(echo "$mode" | xargs)" # Trim whitespace
			case "$mode" in
			motd) export DEV_MODE_MOTD=true ;;
			keep) export DEV_MODE_KEEP=true ;;
			trace) export DEV_MODE_TRACE=true ;;
			pause) export DEV_MODE_PAUSE=true ;;
			breakpoint) export DEV_MODE_BREAKPOINT=true ;;
			logs) export DEV_MODE_LOGS=true ;;
			dryrun) export DEV_MODE_DRYRUN=true ;;
			*)
				if declare -f msg_warn >/dev/null 2>&1; then
					msg_warn "Unknown dev_mode: '$mode' (ignored)"
				else
					echo "[WARN] Unknown dev_mode: '$mode' (ignored)" >&2
				fi
				;;
			esac
		done

		# Show active dev modes
		local active_modes=()
		[[ $DEV_MODE_MOTD == true ]] && active_modes+=("motd")
		[[ $DEV_MODE_KEEP == true ]] && active_modes+=("keep")
		[[ $DEV_MODE_TRACE == true ]] && active_modes+=("trace")
		[[ $DEV_MODE_PAUSE == true ]] && active_modes+=("pause")
		[[ $DEV_MODE_BREAKPOINT == true ]] && active_modes+=("breakpoint")
		[[ $DEV_MODE_LOGS == true ]] && active_modes+=("logs")
		[[ $DEV_MODE_DRYRUN == true ]] && active_modes+=("dryrun")

		if [[ ${#active_modes[@]} -gt 0 ]]; then
			if declare -f msg_custom >/dev/null 2>&1; then
				msg_custom "🔧" "${YWB}" "Dev modes active: ${active_modes[*]}"
			else
				echo "[DEV] Active modes: ${active_modes[*]}" >&2
			fi
		fi
	fi
}

# ==============================================================================
# SECTION 2: VALIDATION CHECKS
# ==============================================================================

# ------------------------------------------------------------------------------
# shell_check()
#
# - Verifies that the script is running under Bash shell
# - Exits with error message if different shell is detected
# - Required because scripts use Bash-specific features
# ------------------------------------------------------------------------------
shell_check() {
	if [[ "$(ps -p $$ -o comm=)" != "bash" ]]; then
		clear
		msg_error "Your default shell is currently not set to Bash. To use these scripts, please switch to the Bash shell."
		echo -e "\nExiting..."
		sleep 2
		exit 103
	fi
}

# ------------------------------------------------------------------------------
# root_check()
#
# - Verifies script is running with root privileges
# - Detects if executed via sudo (which can cause issues)
# - Exits with error if not running as root directly
# ------------------------------------------------------------------------------
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 104
	fi
}

# ------------------------------------------------------------------------------
# pve_check()
#
# - Validates Proxmox VE version compatibility
# - Supported: PVE 8.0-8.9 and PVE 9.0-9.2
# - Exits with error message if unsupported version detected
# ------------------------------------------------------------------------------
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 105
		fi
		return 0
	fi

	# Check for Proxmox VE 9.x: allow 9.0–9.2
	if [[ "$PVE_VER" =~ ^9\.([0-9]+) ]]; then
		local MINOR="${BASH_REMATCH[1]}"
		if ((MINOR < 0 || MINOR > 2)); then
			msg_error "This version of Proxmox VE is not yet supported."
			msg_error "Supported: Proxmox VE version 9.0 – 9.2"
			exit 105
		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 – 8.9 or 9.0 – 9.2"
	exit 105
}

# ------------------------------------------------------------------------------
# arch_check()
#
# - Validates system architecture is amd64/x86_64
# - Exits with error message for unsupported architectures (e.g., ARM/PiMox)
# - Provides link to ARM64-compatible scripts
# ------------------------------------------------------------------------------
arch_check() {
	local arch
	arch="$(dpkg --print-architecture)"
	if [[ "$arch" != "amd64" && "$arch" != "arm64" ]]; then
		msg_error "This script requires amd64 or arm64 (detected: $arch)."
		sleep 2
		exit 106
	fi
	if [[ "$arch" == "arm64" && "${var_arm64:-}" != "yes" ]]; then
		msg_error "This script does not yet support arm64."
		sleep 2
		exit 106
	fi
}

# ------------------------------------------------------------------------------
# arch_resolve()
#
# - Selects an architecture-specific value while preserving amd64 defaults
# - Usage: arch_resolve "amd64-value" "arm64-value"
# - Defaults: amd64="amd64", arm64="arm64"
# ------------------------------------------------------------------------------
arch_resolve() {
	local amd64_val="${1:-amd64}"
	local arm64_val="${2:-arm64}"
	local arch="${PCT_ARCH:-$(dpkg --print-architecture 2>/dev/null || uname -m)}"
	case "$arch" in
	amd64 | x86_64) echo "$amd64_val" ;;
	arm64 | aarch64) echo "$arm64_val" ;;
	*)
		msg_error "Unsupported architecture: $arch"
		return 106
		;;
	esac
}

# ------------------------------------------------------------------------------
# ssh_check()
#
# - Detects if script is running over SSH connection
# - Warns user for external SSH connections (recommends Proxmox shell)
# - Skips warning for local/same-subnet connections
# - Does not abort execution, only warns
# ------------------------------------------------------------------------------
ssh_check() {
	if [ -n "$SSH_CLIENT" ]; then
		local client_ip=$(awk '{print $1}' <<<"$SSH_CLIENT")
		local host_ip=$(hostname -I | awk '{print $1}')

		# Check if connection is local (Proxmox WebUI or same machine)
		# - localhost (127.0.0.1, ::1)
		# - same IP as host
		# - local network range (10.x, 172.16-31.x, 192.168.x)
		if [[ "$client_ip" == "127.0.0.1" || "$client_ip" == "::1" || "$client_ip" == "$host_ip" ]]; then
			return
		fi

		# Check if client is in same local network (optional, safer approach)
		local host_subnet=$(echo "$host_ip" | cut -d. -f1-3)
		local client_subnet=$(echo "$client_ip" | cut -d. -f1-3)
		if [[ "$host_subnet" == "$client_subnet" ]]; then
			return
		fi

		# Only warn for truly external connections
		msg_warn "Running via external SSH (client: $client_ip)."
		msg_warn "For better stability, consider using the Proxmox Shell (Console) instead."
	fi
}

# ==============================================================================
# SECTION 3: EXECUTION HELPERS
# ==============================================================================

# ------------------------------------------------------------------------------
# get_active_logfile()
#
# - Returns the appropriate log file based on execution context
# - _HOST_LOGFILE: Override for host context (keeps host logging on BUILD_LOG
#   even after INSTALL_LOG is exported for the container)
# - INSTALL_LOG: Container operations (application installation)
# - BUILD_LOG: Host operations (container creation)
# - Fallback to BUILD_LOG if neither is set
# ------------------------------------------------------------------------------
get_active_logfile() {
	# Host override: _HOST_LOGFILE is set (not exported) in build.func to keep
	# host-side logging in BUILD_LOG after INSTALL_LOG is exported for the container.
	# Without this, all host msg_info/msg_ok/msg_error would write to
	# /root/.install-SESSION.log (a container path) instead of BUILD_LOG.
	if [[ -n "${_HOST_LOGFILE:-}" ]]; then
		echo "$_HOST_LOGFILE"
	elif [[ -n "${INSTALL_LOG:-}" ]]; then
		echo "$INSTALL_LOG"
	elif [[ -n "${BUILD_LOG:-}" ]]; then
		echo "$BUILD_LOG"
	else
		# Fallback for legacy scripts
		echo "/tmp/build-$(date +%Y%m%d_%H%M%S).log"
	fi
}

# Legacy compatibility: SILENT_LOGFILE points to active log
SILENT_LOGFILE="$(get_active_logfile)"

# ------------------------------------------------------------------------------
# strip_ansi()
#
# - Removes ANSI escape sequences from input text
# - Used to clean colored output for log files
# - Handles both piped input and arguments
# ------------------------------------------------------------------------------
strip_ansi() {
	if [[ $# -gt 0 ]]; then
		echo -e "$*" | sed 's/\x1b\[[0-9;]*m//g; s/\x1b\[[0-9;]*[a-zA-Z]//g'
	else
		sed 's/\x1b\[[0-9;]*m//g; s/\x1b\[[0-9;]*[a-zA-Z]//g'
	fi
}

# ------------------------------------------------------------------------------
# log_msg()
#
# - Writes message to active log file without ANSI codes
# - Adds timestamp prefix for log correlation
# - Creates log file if it doesn't exist
# - Arguments: message text (can include ANSI codes, will be stripped)
# ------------------------------------------------------------------------------
log_msg() {
	local msg="$*"
	local logfile
	logfile="$(get_active_logfile)"

	[[ -z "$msg" ]] && return
	[[ -z "$logfile" ]] && return

	# Ensure log directory exists
	mkdir -p "$(dirname "$logfile")" 2>/dev/null || true

	# Strip ANSI codes and write with timestamp
	local clean_msg
	clean_msg=$(strip_ansi "$msg")
	echo "[$(date '+%Y-%m-%d %H:%M:%S')] $clean_msg" >>"$logfile"
}

# ------------------------------------------------------------------------------
# log_section()
#
# - Writes a section header to the log file
# - Used for separating different phases of installation
# - Arguments: section name
# ------------------------------------------------------------------------------
log_section() {
	local section="$1"
	local logfile
	logfile="$(get_active_logfile)"

	[[ -z "$logfile" ]] && return
	mkdir -p "$(dirname "$logfile")" 2>/dev/null || true

	{
		echo ""
		echo "================================================================================"
		echo "[$(date '+%Y-%m-%d %H:%M:%S')] $section"
		echo "================================================================================"
	} >>"$logfile"
}

# ------------------------------------------------------------------------------
# silent()
#
# - Executes command with output redirected to active log file
# - On error: displays last 20 lines of log and exits with original exit code
# - Temporarily disables error trap to capture exit code correctly
# - Saves and restores previous error handling state (so callers that
#   intentionally disabled error handling aren't silently re-enabled)
# - Sources explain_exit_code() for detailed error messages
# ------------------------------------------------------------------------------
silent() {
	local cmd="$*"
	local caller_line="${BASH_LINENO[0]:-unknown}"
	local logfile="$(get_active_logfile)"

	# Dryrun mode: Show command without executing
	if [[ "${DEV_MODE_DRYRUN:-false}" == "true" ]]; then
		if declare -f msg_custom >/dev/null 2>&1; then
			msg_custom "🔍" "${BL}" "[DRYRUN] $cmd"
		else
			echo "[DRYRUN] $cmd" >&2
		fi
		return 0
	fi

	# Save current error handling state before disabling
	# This prevents re-enabling error handling when the caller intentionally
	# disabled it (e.g. build_container recovery section)
	local _restore_errexit=false
	[[ "$-" == *e* ]] && _restore_errexit=true

	set +Eeuo pipefail
	trap - ERR

	"$@" >>"$logfile" 2>&1
	local rc=$?

	# Restore error handling ONLY if it was active before this call
	if $_restore_errexit; then
		set -Eeuo pipefail
		trap 'error_handler' ERR
	fi

	if [[ $rc -ne 0 ]]; then
		# Return instead of exit so that callers can use `$STD cmd || true`
		# or `if $STD cmd; then ...` to handle errors gracefully.
		# When no || / if is used, set -e + ERR trap will still catch it
		# and error_handler() will display the error and exit.
		#
		# Set flag so error_handler knows to show log tail from silent's logfile
		export _SILENT_FAILED_RC="$rc"
		export _SILENT_FAILED_CMD="$cmd"
		export _SILENT_FAILED_LINE="$caller_line"
		export _SILENT_FAILED_LOG="$logfile"

		return "$rc"
	fi

	# Clear stale flags on success (prevents false positives if a previous
	# $STD cmd || true failed and a later non-silent command triggers error_handler)
	unset _SILENT_FAILED_RC _SILENT_FAILED_CMD _SILENT_FAILED_LINE _SILENT_FAILED_LOG 2>/dev/null || true
}

# ------------------------------------------------------------------------------
# apt_update_safe()
#
# - Runs apt-get update with graceful error handling
# - On failure: shows warning with common causes instead of aborting
# - Logs full output to active log file
# - Returns 0 even on failure so the caller can continue
# - Typical cause: enterprise repos returning 401 Unauthorized
#
# Usage:
#   apt_update_safe       # Warn on failure, continue without aborting
# ------------------------------------------------------------------------------
apt_update_safe() {
	local logfile
	logfile="$(get_active_logfile)"

	local _restore_errexit=false
	[[ "$-" == *e* ]] && _restore_errexit=true

	set +Eeuo pipefail
	trap - ERR

	apt-get update >>"$logfile" 2>&1
	local rc=$?

	if $_restore_errexit; then
		set -Eeuo pipefail
		trap 'error_handler' ERR
	fi

	if [[ $rc -ne 0 ]]; then
		msg_warn "apt-get update exited with code ${rc} — some repositories may have failed."

		# Check log for common 401/403 enterprise repo issues
		if grep -qiE '401\s*Unauthorized|403\s*Forbidden|enterprise\.proxmox\.com' "$logfile" 2>/dev/null; then
			echo -e "${TAB}${INFO} ${YWB}Hint: Proxmox enterprise repository returned an auth error.${CL}"
			echo -e "${TAB}       If you don't have a subscription, you can disable the enterprise"
			echo -e "${TAB}       repo and use the no-subscription repo instead."
		fi

		echo -e "${TAB}${INFO} ${YWB}Continuing despite partial update failure — packages may still be installable.${CL}"
		echo ""
	fi

	return 0
}

# ------------------------------------------------------------------------------
# spinner()
#
# - Displays animated spinner with rotating characters (⠋ ⠙ ⠹ ⠸ ⠼ ⠴ ⠦ ⠧ ⠇ ⠏)
# - Shows SPINNER_MSG alongside animation
# - Runs in infinite loop until killed by stop_spinner()
# - Uses color_spinner() colors for output
# ------------------------------------------------------------------------------
spinner() {
	local chars=(⠋ ⠙ ⠹ ⠸ ⠼ ⠴ ⠦ ⠧ ⠇ ⠏)
	local msg="${SPINNER_MSG:-Processing...}"
	local i=0
	while true; do
		local index=$((i++ % ${#chars[@]}))
		printf "\r\033[2K%s %b" "${CS_YWB}${chars[$index]}${CS_CL}" "${CS_YWB}${msg}${CS_CL}"
		sleep 0.1
	done
}

# ------------------------------------------------------------------------------
# clear_line()
#
# - Clears current terminal line using tput or ANSI escape codes
# - Moves cursor to beginning of line (carriage return)
# - Erases from cursor to end of line
# - Fallback to ANSI codes if tput not available
# ------------------------------------------------------------------------------
clear_line() {
	tput cr 2>/dev/null || echo -en "\r"
	tput el 2>/dev/null || echo -en "\033[K"
}

# ------------------------------------------------------------------------------
# stop_spinner()
#
# - Stops running spinner process by PID
# - Reads PID from SPINNER_PID variable or /tmp/.spinner.pid file
# - Attempts graceful kill, then forced kill if needed
# - Cleans up temp file and resets terminal state
# - Unsets SPINNER_PID and SPINNER_MSG variables
# ------------------------------------------------------------------------------
stop_spinner() {
	local pid="${SPINNER_PID:-}"
	[[ -z "$pid" && -f /tmp/.spinner.pid ]] && pid=$(</tmp/.spinner.pid)

	if [[ -n "$pid" && "$pid" =~ ^[0-9]+$ ]]; then
		if kill "$pid" 2>/dev/null; then
			sleep 0.05
			kill -9 "$pid" 2>/dev/null || true
			wait "$pid" 2>/dev/null || true
		fi
		rm -f /tmp/.spinner.pid
	fi

	unset SPINNER_PID SPINNER_MSG
	stty sane 2>/dev/null || true
	stty -tostop 2>/dev/null || true
}

# ==============================================================================
# SECTION 4: MESSAGE OUTPUT
# ==============================================================================

# ------------------------------------------------------------------------------
# msg_info()
#
# - Displays informational message with spinner animation
# - Shows each unique message only once (tracked via MSG_INFO_SHOWN)
# - In verbose/Alpine mode: shows hourglass icon instead of spinner
# - Stops any existing spinner before starting new one
# - Backgrounds spinner process and stores PID for later cleanup
# ------------------------------------------------------------------------------
msg_info() {
	local msg="$1"
	[[ -z "$msg" ]] && return

	if ! declare -p MSG_INFO_SHOWN &>/dev/null || ! declare -A MSG_INFO_SHOWN &>/dev/null; then
		declare -gA MSG_INFO_SHOWN=()
	fi
	[[ -n "${MSG_INFO_SHOWN["$msg"]+x}" ]] && return
	MSG_INFO_SHOWN["$msg"]=1

	# Log to file
	log_msg "[INFO] $msg"

	stop_spinner
	SPINNER_MSG="$msg"

	if is_verbose_mode || is_alpine; then
		local HOURGLASS="${TAB}⏳${TAB}"
		printf "\r\e[2K%s%b" "$HOURGLASS" "${YW}${msg}${CL}" >&2

		# Pause mode: Wait for Enter after each step
		if [[ "${DEV_MODE_PAUSE:-false}" == "true" ]]; then
			echo -en "\n${YWB}[PAUSE]${CL} Press Enter to continue..." >&2
			read -r
		fi
		return
	fi

	color_spinner
	spinner &
	SPINNER_PID=$!
	echo "$SPINNER_PID" >/tmp/.spinner.pid
	disown "$SPINNER_PID" 2>/dev/null || true

	# Pause mode: Stop spinner and wait
	if [[ "${DEV_MODE_PAUSE:-false}" == "true" ]]; then
		stop_spinner
		echo -en "\n${YWB}[PAUSE]${CL} Press Enter to continue..." >&2
		read -r
	fi
}

# ------------------------------------------------------------------------------
# msg_ok()
#
# - Displays success message with checkmark icon
# - Stops spinner and clears line before output
# - Removes message from MSG_INFO_SHOWN to allow re-display
# - Uses green color for success indication
# ------------------------------------------------------------------------------
msg_ok() {
	local msg="$1"
	[[ -z "$msg" ]] && return
	stop_spinner
	clear_line
	echo -e "$CM${GN}${msg}${CL}"
	log_msg "[OK] $msg"
	local sanitized_msg
	sanitized_msg=$(printf '%s' "$msg" | sed 's/\x1b\[[0-9;]*m//g; s/[^a-zA-Z0-9_]/_/g')
	unset 'MSG_INFO_SHOWN['"$sanitized_msg"']' 2>/dev/null || true
}

# ------------------------------------------------------------------------------
# msg_error()
#
# - Displays error message with cross/X icon
# - Stops spinner before output
# - Uses red color for error indication
# - Outputs to stderr
# ------------------------------------------------------------------------------
msg_error() {
	stop_spinner
	local msg="$1"
	echo -e "${BFR:-}${CROSS:-✖️}${RD}${msg}${CL}" >&2
	log_msg "[ERROR] $msg"
}

# ------------------------------------------------------------------------------
# msg_warn()
#
# - Displays warning message with info/lightbulb icon
# - Stops spinner before output
# - Uses bright yellow color for warning indication
# - Outputs to stderr
# ------------------------------------------------------------------------------
msg_warn() {
	stop_spinner
	local msg="$1"
	echo -e "${BFR:-}${INFO:-ℹ️}${YWB}${msg}${CL}" >&2
	log_msg "[WARN] $msg"
}

# ------------------------------------------------------------------------------
# msg_custom()
#
# - Displays custom message with user-defined symbol and color
# - Arguments: symbol, color code, message text
# - Stops spinner before output
# - Useful for specialized status messages
# ------------------------------------------------------------------------------
msg_custom() {
	local symbol="${1:-"[*]"}"
	local color="${2:-"\e[36m"}"
	local msg="${3:-}"
	[[ -z "$msg" ]] && return
	stop_spinner
	echo -e "${BFR:-} ${symbol} ${color}${msg}${CL:-\e[0m}"
	log_msg "$msg"
}

# ------------------------------------------------------------------------------
# msg_debug()
#
# - Displays debug message with timestamp when var_full_verbose=1
# - Automatically enables var_verbose if not already set
# - Shows date/time prefix for log correlation
# - Uses bright yellow color for debug output
# ------------------------------------------------------------------------------
msg_debug() {
	if [[ "${var_full_verbose:-0}" == "1" ]]; then
		[[ "${var_verbose:-0}" != "1" ]] && var_verbose=1
		echo -e "${YWB}[$(date '+%F %T')] [DEBUG]${CL} $*"
	fi
}

# ------------------------------------------------------------------------------
# msg_dev()
#
# - Display development mode messages with 🔧 icon
# - Only shown when dev_mode is active
# - Useful for debugging and development-specific output
# - Format: [DEV] message with distinct formatting
# - Usage: msg_dev "Container ready for debugging"
# ------------------------------------------------------------------------------
msg_dev() {
	if [[ -n "${dev_mode:-}" ]]; then
		echo -e "${SEARCH}${BOLD}${DGN}🔧 [DEV]${CL} $*"
	fi
}
#
# - Displays error message and immediately terminates script
# - Sends SIGINT to current process to trigger error handler
# - Use for unrecoverable errors that require immediate exit
# ------------------------------------------------------------------------------
fatal() {
	msg_error "$1"
	kill -INT $$
}

# ==============================================================================
# SECTION 5: UTILITY FUNCTIONS
# ==============================================================================

# ------------------------------------------------------------------------------
# exit_script()
#
# - Called when user cancels an action
# - Clears screen and displays exit message
# - Exits with default exit code
# ------------------------------------------------------------------------------
exit_script() {
	clear
	msg_error "User exited script"
	exit 0
}

# ------------------------------------------------------------------------------
# get_header()
#
# - Downloads and caches application header ASCII art
# - Falls back to local cache if already downloaded
# - Determines app type (ct/vm) from APP_TYPE variable
# - Returns header content or empty string on failure
# ------------------------------------------------------------------------------
get_header() {
	local app_name=$(echo "${APP,,}" | tr -d ' ')
	local app_type=${APP_TYPE:-ct} # Default to 'ct' if not set
	local header_dir="${app_type}"
	[[ "$app_type" == "addon" ]] && header_dir="tools"
	local header_url="https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/${header_dir}/headers/${app_name}"
	local local_header_path="/usr/local/community-scripts/headers/${app_type}/${app_name}"

	mkdir -p "$(dirname "$local_header_path")"

	if [ ! -s "$local_header_path" ]; then
		if ! curl -fsSL "$header_url" -o "$local_header_path"; then
			msg_warn "Failed to download header: $header_url"
			return 250
		fi
	fi

	cat "$local_header_path" 2>/dev/null || true
}

# ------------------------------------------------------------------------------
# header_info()
#
# - Displays application header ASCII art at top of screen
# - Clears screen before displaying header
# - Detects terminal width for formatting
# - Returns silently if header not available
# ------------------------------------------------------------------------------
header_info() {
	# Guard against printing the header twice in the same session (e.g. when
	# the ct script calls header_info at global scope AND again inside
	# update_script()).
	[[ "${_HEADER_SHOWN:-0}" == "1" ]] && return 0
	_HEADER_SHOWN=1

	local app_name=$(echo "${APP,,}" | tr -d ' ')
	local header_content

	header_content=$(get_header "$app_name") || header_content=""

	clear
	local term_width
	term_width=$(tput cols 2>/dev/null || echo 120)

	if [ -n "$header_content" ]; then
		echo "$header_content"
	fi
}

# ------------------------------------------------------------------------------
# ensure_tput()
#
# - Ensures tput command is available for terminal control
# - Installs ncurses-bin on Debian/Ubuntu or ncurses on Alpine
# - Required for clear_line() and terminal width detection
# ------------------------------------------------------------------------------
ensure_tput() {
	if ! command -v tput >/dev/null 2>&1; then
		if grep -qi 'alpine' /etc/os-release; then
			apk add --no-cache ncurses >/dev/null 2>&1 || msg_warn "Failed to install ncurses (tput may be unavailable)"
		elif command -v apt-get >/dev/null 2>&1; then
			apt-get update -qq >/dev/null
			apt-get install -y -qq ncurses-bin >/dev/null 2>&1 || msg_warn "Failed to install ncurses-bin (tput may be unavailable)"
		fi
	fi
}

# ------------------------------------------------------------------------------
# is_alpine()
#
# - Detects if running on Alpine Linux
# - Checks var_os, PCT_OSTYPE, or /etc/os-release
# - Returns 0 if Alpine, 1 otherwise
# - Used to adjust behavior for Alpine-specific commands
# ------------------------------------------------------------------------------
is_alpine() {
	local os_id="${var_os:-${PCT_OSTYPE:-}}"

	if [[ -z "$os_id" && -f /etc/os-release ]]; then
		os_id="$(
			. /etc/os-release 2>/dev/null
			echo "${ID:-}"
		)"
	fi

	[[ "$os_id" == "alpine" ]]
}

# ------------------------------------------------------------------------------
# is_verbose_mode()
#
# - Determines if script should run in verbose mode
# - Checks VERBOSE and var_verbose variables
# - Used by msg_info() to decide between spinner and static output
# - Note: Non-TTY (pipe) scenarios are handled separately in msg_info()
#   to allow spinner output to pass through pipes (e.g. lxc-attach | tee)
# ------------------------------------------------------------------------------
is_verbose_mode() {
	local verbose="${VERBOSE:-${var_verbose:-no}}"
	[[ "$verbose" != "no" ]]
}

# ------------------------------------------------------------------------------
# configure_http_proxy()
#
# - Applies var_http_proxy / var_http_no_proxy inside the container
# - Persists proxy env for login shells, systemd, and package managers
# - Skips APT proxy config when APT Cacher-NG is active
# ------------------------------------------------------------------------------
configure_http_proxy() {
	local proxy="${HTTP_PROXY:-${http_proxy:-${var_http_proxy:-}}}"
	local noproxy="${HTTP_NO_PROXY:-${no_proxy:-${var_http_no_proxy:-}}}"
	[[ -z "$proxy" ]] && return 0
	[[ -z "$noproxy" ]] && noproxy="localhost,127.0.0.1,.local"

	msg_info "Configuring HTTP proxy"
	cat >/etc/profile.d/90-http-proxy.sh <<EOF
export http_proxy="$proxy"
export https_proxy="$proxy"
export HTTP_PROXY="$proxy"
export HTTPS_PROXY="$proxy"
export no_proxy="$noproxy"
export NO_PROXY="$noproxy"
EOF
	chmod 644 /etc/profile.d/90-http-proxy.sh

	if ! grep -q '^http_proxy=' /etc/environment 2>/dev/null; then
		cat >>/etc/environment <<EOF
http_proxy=$proxy
https_proxy=$proxy
HTTP_PROXY=$proxy
HTTPS_PROXY=$proxy
no_proxy=$noproxy
NO_PROXY=$noproxy
EOF
	fi

	if [[ "${CACHER:-}" != "yes" && -d /etc/apt/apt.conf.d ]]; then
		cat >/etc/apt/apt.conf.d/95http-proxy <<EOF
Acquire::http::Proxy "$proxy";
Acquire::https::Proxy "$proxy";
EOF
	fi

	export http_proxy="$proxy" https_proxy="$proxy" HTTP_PROXY="$proxy" HTTPS_PROXY="$proxy"
	export no_proxy="$noproxy" NO_PROXY="$noproxy"
	msg_ok "Configured HTTP proxy"
}

# ------------------------------------------------------------------------------
# is_unattended()
#
# - Detects if script is running in unattended/non-interactive mode
# - Checks MODE variable first (primary method)
# - Falls back to legacy flags (PHS_SILENT, var_unattended)
# - Returns 0 (true) if unattended, 1 (false) otherwise
# - Used by prompt functions to auto-apply defaults
#
# Modes that are unattended:
#   - default (1)      : Use script defaults, no prompts
#   - mydefaults (3)   : Use user's default.vars, no prompts
#   - appdefaults (4)  : Use app-specific defaults, no prompts
#
# Modes that are interactive:
#   - advanced (2)     : Full wizard with all options
#
# Note: Even in advanced mode, install scripts run unattended because
#       all values are already collected during the wizard phase.
# ------------------------------------------------------------------------------
is_unattended() {
	# Primary: Check MODE variable (case-insensitive)
	local mode="${MODE:-${mode:-}}"
	mode="${mode,,}" # lowercase

	case "$mode" in
	default | 1)
		return 0
		;;
	mydefaults | userdefaults | 3)
		return 0
		;;
	appdefaults | 4)
		return 0
		;;
	advanced | 2)
		# Advanced mode is interactive ONLY during wizard
		# Inside container (install scripts), it should be unattended
		# Check if we're inside a container (no pveversion command)
		if ! command -v pveversion &>/dev/null; then
			# We're inside the container - all values already collected
			return 0
		fi
		# On host during wizard - interactive
		return 1
		;;
	esac

	# Legacy fallbacks for compatibility
	[[ "${PHS_SILENT:-0}" == "1" ]] && return 0
	[[ "${var_unattended:-}" =~ ^(yes|true|1)$ ]] && return 0
	[[ "${UNATTENDED:-}" =~ ^(yes|true|1)$ ]] && return 0

	# No TTY available = unattended
	[[ ! -t 0 ]] && return 0

	# Default: interactive
	return 1
}

# ------------------------------------------------------------------------------
# show_missing_values_warning()
#
# - Displays a summary of required values that used fallback defaults
# - Should be called at the end of install scripts
# - Only shows warning if MISSING_REQUIRED_VALUES array has entries
# - Provides clear guidance on what needs manual configuration
#
# Global:
#   MISSING_REQUIRED_VALUES - Array of variable names that need configuration
#
# Example:
#   # At end of install script:
#   show_missing_values_warning
# ------------------------------------------------------------------------------
show_missing_values_warning() {
	if [[ ${#MISSING_REQUIRED_VALUES[@]} -gt 0 ]]; then
		echo ""
		echo -e "${YW}╔════════════════════════════════════════════════════════════╗${CL}"
		echo -e "${YW}║  ⚠️  MANUAL CONFIGURATION REQUIRED                          ║${CL}"
		echo -e "${YW}╠════════════════════════════════════════════════════════════╣${CL}"
		echo -e "${YW}║  The following values were not provided and need to be     ║${CL}"
		echo -e "${YW}║  configured manually for the service to work properly:     ║${CL}"
		echo -e "${YW}╟────────────────────────────────────────────────────────────╢${CL}"
		for val in "${MISSING_REQUIRED_VALUES[@]}"; do
			printf "${YW}║${CL}  • %-56s ${YW}║${CL}\n" "$val"
		done
		echo -e "${YW}╟────────────────────────────────────────────────────────────╢${CL}"
		echo -e "${YW}║  Check the service configuration files or environment      ║${CL}"
		echo -e "${YW}║  variables and update the placeholder values.              ║${CL}"
		echo -e "${YW}╚════════════════════════════════════════════════════════════╝${CL}"
		echo ""
		return 1
	fi
	return 0
}

# ------------------------------------------------------------------------------
# prompt_confirm()
#
# - Prompts user for yes/no confirmation with timeout and unattended support
# - In unattended mode: immediately returns default value
# - In interactive mode: waits for user input with configurable timeout
# - After timeout: auto-applies default value
#
# Arguments:
#   $1 - Prompt message (required)
#   $2 - Default value: "y" or "n" (optional, default: "n")
#   $3 - Timeout in seconds (optional, default: 60)
#
# Returns:
#   0 - User confirmed (yes)
#   1 - User declined (no) or timeout with default "n"
#
# Example:
#   if prompt_confirm "Proceed with installation?" "y" 30; then
#     echo "Installing..."
#   fi
#
#   # Unattended: prompt_confirm will use default without waiting
#   var_unattended=yes
#   prompt_confirm "Delete files?" "n" && echo "Deleting" || echo "Skipped"
# ------------------------------------------------------------------------------
prompt_confirm() {
	local message="${1:-Confirm?}"
	local default="${2:-n}"
	local timeout="${3:-60}"
	local response

	# Normalize default to lowercase
	default="${default,,}"
	[[ "$default" != "y" ]] && default="n"

	# Build prompt hint
	local hint
	if [[ "$default" == "y" ]]; then
		hint="[Y/n]"
	else
		hint="[y/N]"
	fi

	# Unattended mode: apply default immediately
	if is_unattended; then
		if [[ "$default" == "y" ]]; then
			return 0
		else
			return 1
		fi
	fi

	# Check if running in a TTY
	if [[ ! -t 0 ]]; then
		# Not a TTY, use default
		if [[ "$default" == "y" ]]; then
			return 0
		else
			return 1
		fi
	fi

	# Interactive prompt with timeout
	echo -en "${YW}${message} ${hint} (auto-${default} in ${timeout}s): ${CL}"

	if read -t "$timeout" -r response; then
		# User provided input
		response="${response,,}" # lowercase
		case "$response" in
		y | yes)
			return 0
			;;
		n | no)
			return 1
			;;
		"")
			# Empty response, use default
			if [[ "$default" == "y" ]]; then
				return 0
			else
				return 1
			fi
			;;
		*)
			# Invalid input, use default
			echo -e "${YW}Invalid response, using default: ${default}${CL}"
			if [[ "$default" == "y" ]]; then
				return 0
			else
				return 1
			fi
			;;
		esac
	else
		# Timeout occurred
		echo "" # Newline after timeout
		echo -e "${YW}Timeout - auto-selecting: ${default}${CL}"
		if [[ "$default" == "y" ]]; then
			return 0
		else
			return 1
		fi
	fi
}

# ------------------------------------------------------------------------------
# prompt_input()
#
# - Prompts user for text input with timeout and unattended support
# - In unattended mode: immediately returns default value
# - In interactive mode: waits for user input with configurable timeout
# - After timeout: auto-applies default value
#
# Arguments:
#   $1 - Prompt message (required)
#   $2 - Default value (optional, default: "")
#   $3 - Timeout in seconds (optional, default: 60)
#
# Output:
#   Prints the user input or default value to stdout
#
# Example:
#   username=$(prompt_input "Enter username:" "admin" 30)
#   echo "Using username: $username"
#
#   # With validation
#   while true; do
#     port=$(prompt_input "Enter port:" "8080" 30)
#     [[ "$port" =~ ^[0-9]+$ ]] && break
#     echo "Invalid port number"
#   done
# ------------------------------------------------------------------------------
prompt_input() {
	local message="${1:-Enter value:}"
	local default="${2:-}"
	local timeout="${3:-60}"
	local response

	# Build display default hint
	local hint=""
	[[ -n "$default" ]] && hint=" (default: ${default})"

	# Unattended mode: return default immediately
	if is_unattended; then
		echo "$default"
		return 0
	fi

	# Check if running in a TTY
	if [[ ! -t 0 ]]; then
		# Not a TTY, use default
		echo "$default"
		return 0
	fi

	# Interactive prompt with timeout
	echo -en "${YW}${message}${hint} (auto-default in ${timeout}s): ${CL}" >&2

	if read -t "$timeout" -r response; then
		# User provided input (or pressed Enter for empty)
		if [[ -n "$response" ]]; then
			echo "$response"
		else
			echo "$default"
		fi
	else
		# Timeout occurred
		echo "" >&2 # Newline after timeout
		echo -e "${YW}Timeout - using default: ${default}${CL}" >&2
		echo "$default"
	fi
}

# ------------------------------------------------------------------------------
# prompt_input_required()
#
# - Prompts user for REQUIRED text input with fallback support
# - In unattended mode: Uses fallback value if no env var set (with warning)
# - In interactive mode: loops until user provides non-empty input
# - Tracks missing required values for end-of-script summary
#
# Arguments:
#   $1 - Prompt message (required)
#   $2 - Fallback/example value for unattended mode (optional)
#   $3 - Timeout in seconds (optional, default: 120)
#   $4 - Environment variable name hint for error messages (optional)
#
# Output:
#   Prints the user input or fallback value to stdout
#
# Returns:
#   0 - Success (value provided or fallback used)
#   1 - Failed (interactive timeout without input)
#
# Global:
#   MISSING_REQUIRED_VALUES - Array tracking fields that used fallbacks
#
# Example:
#   # With fallback - script continues even in unattended mode
#   token=$(prompt_input_required "Enter API Token:" "YOUR_TOKEN_HERE" 60 "var_api_token")
#
#   # Check at end of script if any values need manual configuration
#   if [[ ${#MISSING_REQUIRED_VALUES[@]} -gt 0 ]]; then
#     msg_warn "Please configure: ${MISSING_REQUIRED_VALUES[*]}"
#   fi
# ------------------------------------------------------------------------------
# Global array to track missing required values
declare -g -a MISSING_REQUIRED_VALUES=()

prompt_input_required() {
	local message="${1:-Enter required value:}"
	local fallback="${2:-CHANGE_ME}"
	local timeout="${3:-120}"
	local env_var_hint="${4:-}"
	local response=""

	# Check if value is already set via environment variable (if hint provided)
	if [[ -n "$env_var_hint" ]]; then
		local env_value="${!env_var_hint:-}"
		if [[ -n "$env_value" ]]; then
			echo "$env_value"
			return 0
		fi
	fi

	# Unattended mode: use fallback with warning
	if is_unattended; then
		if [[ -n "$env_var_hint" ]]; then
			echo -e "${YW}⚠ Required value '${env_var_hint}' not set - using fallback: ${fallback}${CL}" >&2
			MISSING_REQUIRED_VALUES+=("$env_var_hint")
		else
			echo -e "${YW}⚠ Required value not provided - using fallback: ${fallback}${CL}" >&2
			MISSING_REQUIRED_VALUES+=("(unnamed)")
		fi
		echo "$fallback"
		return 0
	fi

	# Check if running in a TTY
	if [[ ! -t 0 ]]; then
		echo -e "${YW}⚠ Not interactive - using fallback: ${fallback}${CL}" >&2
		MISSING_REQUIRED_VALUES+=("${env_var_hint:-unnamed}")
		echo "$fallback"
		return 0
	fi

	# Interactive prompt - loop until non-empty input or use fallback on timeout
	local attempts=0
	while [[ -z "$response" ]]; do
		attempts=$((attempts + 1))

		if [[ $attempts -gt 3 ]]; then
			echo -e "${YW}Too many empty inputs - using fallback: ${fallback}${CL}" >&2
			MISSING_REQUIRED_VALUES+=("${env_var_hint:-manual_input}")
			echo "$fallback"
			return 0
		fi

		echo -en "${YW}${message} (required, timeout ${timeout}s): ${CL}" >&2

		if read -t "$timeout" -r response; then
			if [[ -z "$response" ]]; then
				echo -e "${YW}This field is required. Please enter a value. (attempt ${attempts}/3)${CL}" >&2
			fi
		else
			# Timeout occurred - use fallback
			echo "" >&2
			echo -e "${YW}Timeout - using fallback value: ${fallback}${CL}" >&2
			MISSING_REQUIRED_VALUES+=("${env_var_hint:-timeout}")
			echo "$fallback"
			return 0
		fi
	done

	echo "$response"
}

# ------------------------------------------------------------------------------
# prompt_select()
#
# - Prompts user to select from a list of options with timeout support
# - In unattended mode: immediately returns default selection
# - In interactive mode: displays numbered menu and waits for choice
# - After timeout: auto-applies default selection
#
# Arguments:
#   $1 - Prompt message (required)
#   $2 - Default option number, 1-based (optional, default: 1)
#   $3 - Timeout in seconds (optional, default: 60)
#   $4+ - Options to display (required, at least 2)
#
# Output:
#   Prints the selected option value to stdout
#
# Returns:
#   0 - Success
#   1 - No options provided or invalid state
#
# Example:
#   choice=$(prompt_select "Select database:" 1 30 "PostgreSQL" "MySQL" "SQLite")
#   echo "Selected: $choice"
#
#   # With array
#   options=("Option A" "Option B" "Option C")
#   selected=$(prompt_select "Choose:" 2 60 "${options[@]}")
# ------------------------------------------------------------------------------
prompt_select() {
	local message="${1:-Select option:}"
	local default="${2:-1}"
	local timeout="${3:-60}"
	shift 3

	local options=("$@")
	local num_options=${#options[@]}

	# Validate options
	if [[ $num_options -eq 0 ]]; then
		msg_warn "prompt_select called with no options"
		echo "" >&2
		return 65
	fi

	# Validate default
	if [[ ! "$default" =~ ^[0-9]+$ ]] || [[ "$default" -lt 1 ]] || [[ "$default" -gt "$num_options" ]]; then
		default=1
	fi

	# Unattended mode: return default immediately
	if is_unattended; then
		echo "${options[$((default - 1))]}"
		return 0
	fi

	# Check if running in a TTY
	if [[ ! -t 0 ]]; then
		echo "${options[$((default - 1))]}"
		return 0
	fi

	# Display menu
	echo -e "${YW}${message}${CL}" >&2
	local i
	for i in "${!options[@]}"; do
		local num=$((i + 1))
		if [[ $num -eq $default ]]; then
			echo -e "  ${GN}${num})${CL} ${options[$i]} ${YW}(default)${CL}" >&2
		else
			echo -e "  ${GN}${num})${CL} ${options[$i]}" >&2
		fi
	done

	# Interactive prompt with timeout
	echo -en "${YW}Select [1-${num_options}] (auto-select ${default} in ${timeout}s): ${CL}" >&2

	local response
	if read -t "$timeout" -r response; then
		if [[ -z "$response" ]]; then
			# Empty response, use default
			echo "${options[$((default - 1))]}"
		elif [[ "$response" =~ ^[0-9]+$ ]] && [[ "$response" -ge 1 ]] && [[ "$response" -le "$num_options" ]]; then
			# Valid selection
			echo "${options[$((response - 1))]}"
		else
			# Invalid input, use default
			echo -e "${YW}Invalid selection, using default: ${options[$((default - 1))]}${CL}" >&2
			echo "${options[$((default - 1))]}"
		fi
	else
		# Timeout occurred
		echo "" >&2 # Newline after timeout
		echo -e "${YW}Timeout - auto-selecting: ${options[$((default - 1))]}${CL}" >&2
		echo "${options[$((default - 1))]}"
	fi
}

# ------------------------------------------------------------------------------
# prompt_password()
#
# - Prompts user for password input with hidden characters
# - In unattended mode: returns default or generates random password
# - Supports auto-generation of secure passwords
# - After timeout: generates random password if allowed
#
# Arguments:
#   $1 - Prompt message (required)
#   $2 - Default value or "generate" for auto-generation (optional)
#   $3 - Timeout in seconds (optional, default: 60)
#   $4 - Minimum length for validation (optional, default: 0 = no minimum)
#
# Output:
#   Prints the password to stdout
#
# Example:
#   password=$(prompt_password "Enter password:" "generate" 30 8)
#   echo "Password set"
#
#   # Require user input (no default)
#   db_pass=$(prompt_password "Database password:" "" 60 12)
# ------------------------------------------------------------------------------
prompt_password() {
	local message="${1:-Enter password:}"
	local default="${2:-}"
	local timeout="${3:-60}"
	local min_length="${4:-0}"
	local response

	# Generate random password if requested
	local generated=""
	if [[ "$default" == "generate" ]]; then
		generated=$(openssl rand -base64 16 2>/dev/null | tr -dc 'a-zA-Z0-9' | head -c 16)
		[[ -z "$generated" ]] && generated=$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 16)
		default="$generated"
	fi

	# Unattended mode: return default immediately
	if is_unattended; then
		echo "$default"
		return 0
	fi

	# Check if running in a TTY
	if [[ ! -t 0 ]]; then
		echo "$default"
		return 0
	fi

	# Build hint
	local hint=""
	if [[ -n "$generated" ]]; then
		hint=" (Enter for auto-generated)"
	elif [[ -n "$default" ]]; then
		hint=" (Enter for default)"
	fi
	[[ "$min_length" -gt 0 ]] && hint="${hint} [min ${min_length} chars]"

	# Interactive prompt with timeout (silent input)
	echo -en "${YW}${message}${hint} (timeout ${timeout}s): ${CL}" >&2

	if read -t "$timeout" -rs response; then
		echo "" >&2 # Newline after hidden input
		if [[ -n "$response" ]]; then
			# Validate minimum length
			if [[ "$min_length" -gt 0 ]] && [[ ${#response} -lt "$min_length" ]]; then
				echo -e "${YW}Password too short (min ${min_length}), using default${CL}" >&2
				echo "$default"
			else
				echo "$response"
			fi
		else
			echo "$default"
		fi
	else
		# Timeout occurred
		echo "" >&2 # Newline after timeout
		echo -e "${YW}Timeout - using generated password${CL}" >&2
		echo "$default"
	fi
}

# ==============================================================================
# SECTION 6: CLEANUP & MAINTENANCE
# ==============================================================================

# ------------------------------------------------------------------------------
# cleanup_lxc()
#
# - Cleans package manager and language caches (safe for installs AND updates)
# - Supports Alpine (apk), Debian/Ubuntu (apt), Python, Node.js, Go, Rust, Ruby, PHP
# - Uses fallback error handling to prevent cleanup failures from breaking installs
# ------------------------------------------------------------------------------
cleanup_lxc() {
	msg_info "Cleaning up"

	if is_alpine; then
		$STD apk cache clean || true
		rm -rf /var/cache/apk/*
	else
		$STD apt -y autoremove 2>/dev/null || msg_warn "apt autoremove failed (non-critical)"
		$STD apt -y autoclean 2>/dev/null || msg_warn "apt autoclean failed (non-critical)"
		$STD apt -y clean 2>/dev/null || msg_warn "apt clean failed (non-critical)"
	fi

	find /tmp /var/tmp -type f -name 'tmp*' -delete 2>/dev/null || true
	find /tmp /var/tmp -type f -name 'tempfile*' -delete 2>/dev/null || true

	# Python
	if command -v pip &>/dev/null; then
		rm -rf /root/.cache/pip 2>/dev/null || true
	fi
	if command -v uv &>/dev/null; then
		rm -rf /root/.cache/uv 2>/dev/null || true
	fi

	# Node.js
	if command -v npm &>/dev/null; then
		rm -rf /root/.npm/_cacache /root/.npm/_logs 2>/dev/null || true
	fi
	if command -v yarn &>/dev/null; then
		rm -rf /root/.cache/yarn /root/.yarn/cache 2>/dev/null || true
	fi
	if command -v pnpm &>/dev/null; then
		pnpm store prune &>/dev/null || true
	fi

	# Go (only build cache, not modules)
	if command -v go &>/dev/null; then
		$STD go clean -cache 2>/dev/null || true
	fi

	# Rust (only registry cache, not build artifacts)
	if command -v cargo &>/dev/null; then
		rm -rf /root/.cargo/registry/cache /root/.cargo/.package-cache 2>/dev/null || true
	fi

	# Ruby
	if command -v gem &>/dev/null; then
		rm -rf /root/.gem/cache 2>/dev/null || true
	fi

	# PHP
	if command -v composer &>/dev/null; then
		rm -rf /root/.composer/cache 2>/dev/null || true
	fi

	msg_ok "Cleaned"

	# Send progress ping if available (defined in install.func)
	if declare -f post_progress_to_api &>/dev/null; then
		post_progress_to_api
	fi
}

# ------------------------------------------------------------------------------
# check_or_create_swap()
#
# - Checks if swap is active on system
# - Offers to create swap file if none exists
# - Prompts user for swap size in MB
# - Creates /swapfile with specified size
# - Activates swap immediately
# - Returns 0 if swap active or successfully created, 1 if declined/failed
# ------------------------------------------------------------------------------
check_or_create_swap() {
	msg_info "Checking for active swap"

	if swapon --noheadings --show | grep -q 'swap'; then
		msg_ok "Swap is active"
		return 0
	fi

	msg_error "No active swap detected"

	if ! prompt_confirm "Do you want to create a swap file?" "n" 60; then
		msg_info "Skipping swap file creation"
		return 1
	fi

	local swap_size_mb
	swap_size_mb=$(prompt_input "Enter swap size in MB (e.g., 2048 for 2GB):" "2048" 60)
	if ! [[ "$swap_size_mb" =~ ^[0-9]+$ ]]; then
		msg_error "Invalid swap size: '${swap_size_mb}' (must be a number in MB)"
		return 65
	fi

	local swap_file="/swapfile"

	msg_info "Creating ${swap_size_mb}MB swap file at $swap_file"
	if ! dd if=/dev/zero of="$swap_file" bs=1M count="$swap_size_mb" status=progress; then
		msg_error "Failed to allocate swap file (dd failed)"
		return 150
	fi
	if ! chmod 600 "$swap_file"; then
		msg_error "Failed to set permissions on $swap_file"
		return 150
	fi
	if ! mkswap "$swap_file"; then
		msg_error "Failed to format swap file (mkswap failed)"
		return 150
	fi
	if ! swapon "$swap_file"; then
		msg_error "Failed to activate swap (swapon failed)"
		return 150
	fi
	msg_ok "Swap file created and activated successfully"
}

# ------------------------------------------------------------------------------
# Loads LOCAL_IP from persistent store or detects if missing.
#
# Description:
#   - Loads from /run/local-ip.env or performs runtime lookup
# ------------------------------------------------------------------------------

function get_lxc_ip() {
	local IP_FILE="/run/local-ip.env"
	if [[ -f "$IP_FILE" ]]; then
		# shellcheck disable=SC1090
		source "$IP_FILE"
	fi

	if [[ -z "${LOCAL_IP:-}" ]]; then
		get_current_ip() {
			local ip

			# Try direct interface lookup for eth0 FIRST (most reliable for LXC) - IPv4
			ip=$(ip -4 addr show eth0 2>/dev/null | awk '/inet / {print $2}' | cut -d/ -f1 | head -n1)
			if [[ -n "$ip" && "$ip" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
				echo "$ip"
				return 0
			fi

			# Fallback: Try hostname -I (returns IPv4 first if available)
			if command -v hostname >/dev/null 2>&1; then
				ip=$(hostname -I 2>/dev/null | awk '{print $1}')
				if [[ -n "$ip" && "$ip" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
					echo "$ip"
					return 0
				fi
			fi

			# Try routing table with IPv4 targets
			local ipv4_targets=("8.8.8.8" "1.1.1.1" "default")
			for target in "${ipv4_targets[@]}"; do
				if [[ "$target" == "default" ]]; then
					ip=$(ip route get 1 2>/dev/null | awk '{for(i=1;i<=NF;i++) if ($i=="src") print $(i+1)}')
				else
					ip=$(ip route get "$target" 2>/dev/null | awk '{for(i=1;i<=NF;i++) if ($i=="src") print $(i+1)}')
				fi
				if [[ -n "$ip" ]]; then
					echo "$ip"
					return 0
				fi
			done

			# IPv6 fallback: Try direct interface lookup for eth0
			ip=$(ip -6 addr show eth0 scope global 2>/dev/null | awk '/inet6 / {print $2}' | cut -d/ -f1 | head -n1)
			if [[ -n "$ip" && "$ip" =~ : ]]; then
				echo "$ip"
				return 0
			fi

			# IPv6 fallback: Try hostname -I for IPv6
			if command -v hostname >/dev/null 2>&1; then
				ip=$(hostname -I 2>/dev/null | tr ' ' '\n' | grep -E ':' | head -n1)
				if [[ -n "$ip" && "$ip" =~ : ]]; then
					echo "$ip"
					return 0
				fi
			fi

			# IPv6 fallback: Use routing table with IPv6 targets
			local ipv6_targets=("2001:4860:4860::8888" "2606:4700:4700::1111")
			for target in "${ipv6_targets[@]}"; do
				ip=$(ip -6 route get "$target" 2>/dev/null | awk '{for(i=1;i<=NF;i++) if ($i=="src") print $(i+1)}')
				if [[ -n "$ip" && "$ip" =~ : ]]; then
					echo "$ip"
					return 0
				fi
			done

			return 6
		}

		LOCAL_IP="$(get_current_ip || true)"
		if [[ -z "$LOCAL_IP" ]]; then
			msg_error "Could not determine LOCAL_IP (checked: eth0, hostname -I, ip route, IPv6 targets)"
			return 6
		fi
	fi

	export LOCAL_IP
}

# ------------------------------------------------------------------------------
# ensure_whiptail()
#
# - Ensures whiptail is installed
# - Some ARM64 systems will not have whiptail installed
# - Exits with error message if installation fails
# ------------------------------------------------------------------------------
ensure_whiptail() {
	command -v whiptail >/dev/null 2>&1 && return 0

	msg_info "Installing whiptail"
	apt_update_safe
	$STD apt-get install -y whiptail || {
		msg_error "Failed to install whiptail"
		exit 100
	}
	msg_ok "Installed whiptail"
}

# ------------------------------------------------------------------------------
# arm64_notice()
#
# - Shows a short warning when running scripts on ARM64 systems
# ------------------------------------------------------------------------------
arm64_notice() {
	[[ "$(dpkg --print-architecture)" == "arm64" ]] || return 0

	whiptail --backtitle "Proxmox VE Helper Scripts" \
		--title "ARM64 SUPPORT" \
		--ok-button "Continue" \
		--msgbox "ARM64 support is in active development.\n\nSome scripts, packages, or application releases may not be fully tested or working yet." 10 68
}
# ==============================================================================
# SIGNAL TRAPS
# ==============================================================================

trap 'stop_spinner' EXIT INT TERM
