# Copyright (c) 2021-2025 community-scripts ORG
# License: MIT | https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/LICENSE

# if ! declare -f wait_for >/dev/null; then
#   echo "[DEBUG] Undefined function 'wait_for' used from: ${BASH_SOURCE[*]}" >&2
#   wait_for() {
#     echo "[DEBUG] Fallback: wait_for called with: $*" >&2
#     true
#   }
# fi

trap 'on_error $? $LINENO' ERR
trap 'on_exit' EXIT
trap 'on_interrupt' INT
trap 'on_terminate' TERM

if ! declare -f wait_for >/dev/null; then
  wait_for() {
    true
  }
fi

declare -A MSG_INFO_SHOWN=()
SPINNER_PID=""
SPINNER_ACTIVE=0
SPINNER_MSG=""

# ------------------------------------------------------------------------------
# Loads core utility groups once (colors, formatting, icons, defaults).
# ------------------------------------------------------------------------------

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

load_functions() {
  [[ -n "${__FUNCTIONS_LOADED:-}" ]] && return
  __FUNCTIONS_LOADED=1
  color
  formatting
  icons
  default_vars
  set_std_mode
  # add more
}

on_error() {
  local exit_code="$1"
  local lineno="$2"
  msg_error "Script failed at line $lineno with exit code $exit_code"
  # Optionally log to your API or file here
  exit "$exit_code"
}

on_exit() {
  # Always called on script exit, success or failure
  cleanup_temp_files || true
  msg_info "Script exited"
}

on_interrupt() {
  msg_error "Interrupted by user (CTRL+C)"
  exit 130
}

on_terminate() {
  msg_error "Terminated by signal (TERM)"
  exit 143
}

setup_trap_abort_handling() {
  trap '__handle_signal_abort SIGINT' SIGINT
  trap '__handle_signal_abort SIGTERM' SIGTERM
  trap '__handle_unexpected_error $?' ERR
}

__handle_signal_abort() {
  local signal="$1"
  echo
  [ -n "${SPINNER_PID:-}" ] && kill "$SPINNER_PID" 2>/dev/null && wait "$SPINNER_PID" 2>/dev/null

  case "$signal" in
  SIGINT)
    msg_error "Script aborted by user (CTRL+C)"
    exit 130
    ;;
  SIGTERM)
    msg_error "Script terminated (SIGTERM)"
    exit 143
    ;;
  *)
    msg_error "Script interrupted (unknown signal: $signal)"
    exit 1
    ;;
  esac
}

__handle_unexpected_error() {
  local exit_code="$1"
  echo
  [ -n "${SPINNER_PID:-}" ] && kill "$SPINNER_PID" 2>/dev/null && wait "$SPINNER_PID" 2>/dev/null

  case "$exit_code" in
  1)
    msg_error "Generic error occurred (exit code 1)"
    ;;
  2)
    msg_error "Misuse of shell builtins (exit code 2)"
    ;;
  126)
    msg_error "Command invoked cannot execute (exit code 126)"
    ;;
  127)
    msg_error "Command not found (exit code 127)"
    ;;
  128)
    msg_error "Invalid exit argument (exit code 128)"
    ;;
  130)
    msg_error "Script aborted by user (CTRL+C)"
    ;;
  143)
    msg_error "Script terminated by SIGTERM"
    ;;
  *)
    msg_error "Unexpected error occurred (exit code $exit_code)"
    ;;
  esac
  exit "$exit_code"
}

# ------------------------------------------------------------------------------
# Sets ANSI color codes used for styled terminal output.
# ------------------------------------------------------------------------------
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")
}

# ------------------------------------------------------------------------------
# Defines formatting helpers like tab, bold, and line reset sequences.
# ------------------------------------------------------------------------------
formatting() {
  BFR="\\r\\033[K"
  BOLD=$(echo "\033[1m")
  HOLD=" "
  TAB="  "
  TAB3="      "
}

# ------------------------------------------------------------------------------
# Sets symbolic icons used throughout user feedback and prompts.
# ------------------------------------------------------------------------------
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}${CL}"
  DISABLEIPV6="${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}"
}

# ------------------------------------------------------------------------------
# Sets default retry and wait variables used for system actions.
# ------------------------------------------------------------------------------
default_vars() {
  RETRY_NUM=10
  RETRY_EVERY=3
  i=$RETRY_NUM
  #[[ "${VAR_OS:-}" == "unknown" ]]
}

# ------------------------------------------------------------------------------
# Sets default verbose mode for script and os execution.
# ------------------------------------------------------------------------------
set_std_mode() {
  if [ "${VERBOSE:-no}" = "yes" ]; then
    STD=""
  else
    STD="silent"
  fi
}

# Silent execution function
silent() {
  "$@" >/dev/null 2>&1
}

# Function to download & save header files
get_header() {
  local app_name=$(echo "${APP,,}" | tr -d ' ')
  local app_type=${APP_TYPE:-ct} # Default 'ct'
  local header_url="https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/${app_type}/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
      return 1
    fi
  fi

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

header_info() {
  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
}

# ------------------------------------------------------------------------------
# Performs a curl request with retry logic and inline feedback.
# ------------------------------------------------------------------------------

run_curl() {
  if [ "$VERBOSE" = "no" ]; then
    $STD curl "$@"
  else
    curl "$@"
  fi
}

curl_handler() {
  set +e
  trap 'set -e' RETURN
  local args=()
  local url=""
  local max_retries=3
  local delay=2
  local attempt=1
  local exit_code
  local has_output_file=false
  local result=""

  # Parse arguments
  for arg in "$@"; do
    if [[ "$arg" != -* && -z "$url" ]]; then
      url="$arg"
    fi
    [[ "$arg" == "-o" || "$arg" == --output ]] && has_output_file=true
    args+=("$arg")
  done

  if [[ -z "$url" ]]; then
    msg_error "No valid URL or option entered for curl_handler"
    return 1
  fi

  $STD msg_info "Fetching: $url"

  while [[ $attempt -le $max_retries ]]; do
    if $has_output_file; then
      $STD run_curl "${args[@]}"
      exit_code=$?
    else
      result=$(run_curl "${args[@]}")
      exit_code=$?
    fi

    if [[ $exit_code -eq 0 ]]; then
      $STD msg_ok "Fetched: $url"
      $has_output_file || printf '%s' "$result"
      return 0
    fi

    if ((attempt >= max_retries)); then
      # Read error log if it exists
      if [ -s /tmp/curl_error.log ]; then
        local curl_stderr
        curl_stderr=$(</tmp/curl_error.log)
        rm -f /tmp/curl_error.log
      fi
      __curl_err_handler "$exit_code" "$url" "${curl_stderr:-}"
      exit
    fi

    $STD printf "\r\033[K${INFO}${YW}Retry $attempt/$max_retries in ${delay}s...${CL}" >&2
    sleep "$delay"
    ((attempt++))
  done
  set -e
}

# ------------------------------------------------------------------------------
# Handles specific curl error codes and displays descriptive messages.
# ------------------------------------------------------------------------------
__curl_err_handler() {
  local exit_code="$1"
  local target="$2"
  local curl_msg="$3"

  case $exit_code in
  1) msg_error "Unsupported protocol: $target" ;;
  2) msg_error "Curl init failed: $target" ;;
  3) msg_error "Malformed URL: $target" ;;
  5) msg_error "Proxy resolution failed: $target" ;;
  6) msg_error "Host resolution failed: $target" ;;
  7) msg_error "Connection failed: $target" ;;
  9) msg_error "Access denied: $target" ;;
  18) msg_error "Partial file transfer: $target" ;;
  22) msg_error "HTTP error (e.g. 400/404): $target" ;;
  23) msg_error "Write error on local system: $target" ;;
  26) msg_error "Read error from local file: $target" ;;
  28) msg_error "Timeout: $target" ;;
  35) msg_error "SSL connect error: $target" ;;
  47) msg_error "Too many redirects: $target" ;;
  51) msg_error "SSL cert verify failed: $target" ;;
  52) msg_error "Empty server response: $target" ;;
  55) msg_error "Send error: $target" ;;
  56) msg_error "Receive error: $target" ;;
  60) msg_error "SSL CA not trusted: $target" ;;
  67) msg_error "Login denied by server: $target" ;;
  78) msg_error "Remote file not found (404): $target" ;;
  *) msg_error "Curl failed with code $exit_code: $target" ;;
  esac

  [[ -n "$curl_msg" ]] && printf "%s\n" "$curl_msg" >&2
  exit 1
}

fatal() {
  msg_error "$1"
  kill -INT $$
}

# Ensure POSIX compatibility across Alpine and Debian/Ubuntu
# === Spinner Start ===
# Trap cleanup on various signals
trap 'cleanup_spinner' EXIT INT TERM HUP

spinner_frames=('⠋' '⠙' '⠹' '⠸' '⠼' '⠴' '⠦' '⠧' '⠇' '⠏')

# === Spinner Start ===
start_spinner() {
  local msg="$1"
  local spin_i=0
  local interval=0.1

  stop_spinner
  SPINNER_MSG="$msg"
  SPINNER_ACTIVE=1

  {
    while [[ "$SPINNER_ACTIVE" -eq 1 ]]; do
      if [[ -t 2 ]]; then
        printf "\r\e[2K%s %b" "${TAB}${spinner_frames[spin_i]}${TAB}" "${YW}${SPINNER_MSG}${CL}" >&2
      else
        printf "%s...\n" "$SPINNER_MSG" >&2
        break
      fi
      spin_i=$(((spin_i + 1) % ${#spinner_frames[@]}))
      sleep "$interval"
    done
  } &

  local pid=$!
  if ps -p "$pid" >/dev/null 2>&1; then
    SPINNER_PID="$pid"
  else
    SPINNER_ACTIVE=0
    SPINNER_PID=""
  fi
}

# === Spinner Stop ===
stop_spinner() {
  if [[ "$SPINNER_ACTIVE" -eq 1 && -n "$SPINNER_PID" ]]; then
    SPINNER_ACTIVE=0

    if kill -0 "$SPINNER_PID" 2>/dev/null; then
      kill "$SPINNER_PID" 2>/dev/null || true
      for _ in $(seq 1 10); do
        sleep 0.05
        kill -0 "$SPINNER_PID" 2>/dev/null || break
      done
    fi

    if [[ "$SPINNER_PID" =~ ^[0-9]+$ ]]; then
      ps -p "$SPINNER_PID" -o pid= >/dev/null 2>&1 && wait "$SPINNER_PID" 2>/dev/null || true
    fi

    printf "\r\e[2K" >&2
    SPINNER_PID=""
  fi
}

cleanup_spinner() {
  stop_spinner
}

msg_info() {
  local msg="$1"
  [[ -z "$msg" || -n "${MSG_INFO_SHOWN["$msg"]+x}" ]] && return
  MSG_INFO_SHOWN["$msg"]=1
  stop_spinner
  start_spinner "$msg"
}

msg_ok() {
  local msg="$1"
  [[ -z "$msg" ]] && return
  stop_spinner
  printf "\r\e[2K%s %b\n" "$CM" "${GN}${msg}${CL}" >&2
  unset MSG_INFO_SHOWN["$msg"]
}

msg_error() {
  local msg="$1"
  [[ -z "$msg" ]] && return
  stop_spinner
  printf "\r\e[2K%s %b\n" "$CROSS" "${RD}${msg}${CL}" >&2
}

msg_warn() {
  local msg="$1"
  [[ -z "$msg" ]] && return
  stop_spinner
  printf "\r\e[2K%s %b\n" "$INFO" "${YWB}${msg}${CL}" >&2
  unset MSG_INFO_SHOWN["$msg"]
}

msg_custom() {
  local symbol="${1:-"[*]"}"
  local color="${2:-"\e[36m"}" # Default: Cyan
  local msg="${3:-}"

  [[ -z "$msg" ]] && return
  stop_spinner 2>/dev/null || true
  printf "\r\e[2K%s %b\n" "$symbol" "${color}${msg}${CL:-\e[0m}" >&2
}

msg_progress() {
  local current="$1"
  local total="$2"
  local label="$3"
  local width=40
  local filled percent bar empty
  local fill_char="#"
  local empty_char="-"

  if ! [[ "$current" =~ ^[0-9]+$ ]] || ! [[ "$total" =~ ^[0-9]+$ ]] || [[ "$total" -eq 0 ]]; then
    printf "\r\e[2K%s %b\n" "$CROSS" "${RD}Invalid progress input${CL}" >&2
    return
  fi

  percent=$(((current * 100) / total))
  filled=$(((current * width) / total))
  empty=$((width - filled))

  bar=$(printf "%${filled}s" | tr ' ' "$fill_char")
  bar+=$(printf "%${empty}s" | tr ' ' "$empty_char")

  printf "\r\e[2K%s [%s] %3d%% %s" "${TAB}" "$bar" "$percent" "$label" >&2

  if [[ "$current" -eq "$total" ]]; then
    printf "\n" >&2
  fi
}

run_container_safe() {
  local ct="$1"
  shift
  local cmd="$*"

  lxc-attach -n "$ct" -- bash -euo pipefail -c "
    trap 'echo Aborted in container; exit 130' SIGINT SIGTERM
    $cmd
  " || __handle_general_error "lxc-attach to CT $ct"
}

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"

  read -p "Do you want to create a swap file? [y/N]: " create_swap
  create_swap="${create_swap,,}" # to lowercase

  if [[ "$create_swap" != "y" && "$create_swap" != "yes" ]]; then
    msg_info "Skipping swap file creation"
    return 1
  fi

  read -p "Enter swap size in MB (e.g., 2048 for 2GB): " swap_size_mb
  if ! [[ "$swap_size_mb" =~ ^[0-9]+$ ]]; then
    msg_error "Invalid size input. Aborting."
    return 1
  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="$swap_size_mb" status=progress &&
    chmod 600 "$swap_file" &&
    mkswap "$swap_file" &&
    swapon "$swap_file"; then
    msg_ok "Swap file created and activated successfully"
  else
    msg_error "Failed to create or activate swap"
    return 1
  fi
}
