#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Error & Signal Handling for ProxmoxVED Scripts
# ------------------------------------------------------------------------------
# Copyright (c) 2021-2025 community-scripts ORG
# Author: MickLesk (CanbiZ)
# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
# ------------------------------------------------------------------------------

explain_exit_code() {
    local code="$1"
    case "$code" in
    # --- Generic / Shell ---
    1) echo "General error / Operation not permitted" ;;
    2) echo "Misuse of shell builtins (e.g. syntax error)" ;;
    126) echo "Command invoked cannot execute (permission problem?)" ;;
    127) echo "Command not found" ;;
    128) echo "Invalid argument to exit" ;;
    130) echo "Terminated by Ctrl+C (SIGINT)" ;;
    137) echo "Killed (SIGKILL / Out of memory?)" ;;
    139) echo "Segmentation fault (core dumped)" ;;
    143) echo "Terminated (SIGTERM)" ;;

    # --- Package manager / APT / DPKG ---
    100) echo "APT: Package manager error (broken packages / dependency problems)" ;;
    101) echo "APT: Configuration error (bad sources.list, malformed config)" ;;
    255) echo "DPKG: Fatal internal error" ;;

    # --- Node.js / npm / pnpm / yarn ---
    243) echo "Node.js: Out of memory (JavaScript heap out of memory)" ;;
    245) echo "Node.js: Invalid command-line option" ;;
    246) echo "Node.js: Internal JavaScript Parse Error" ;;
    247) echo "Node.js: Fatal internal error" ;;
    248) echo "Node.js: Invalid C++ addon / N-API failure" ;;
    249) echo "Node.js: Inspector error" ;;
    254) echo "npm/pnpm/yarn: Unknown fatal error" ;;

    # --- Python / pip / uv ---
    210) echo "Python: Virtualenv / uv environment missing or broken" ;;
    211) echo "Python: Dependency resolution failed" ;;
    212) echo "Python: Installation aborted (permissions or EXTERNALLY-MANAGED)" ;;

    # --- PostgreSQL ---
    231) echo "PostgreSQL: Connection failed (server not running / wrong socket)" ;;
    232) echo "PostgreSQL: Authentication failed (bad user/password)" ;;
    233) echo "PostgreSQL: Database does not exist" ;;
    234) echo "PostgreSQL: Fatal error in query / syntax" ;;

    # --- MySQL / MariaDB ---
    241) echo "MySQL/MariaDB: Connection failed (server not running / wrong socket)" ;;
    242) echo "MySQL/MariaDB: Authentication failed (bad user/password)" ;;
    243) echo "MySQL/MariaDB: Database does not exist" ;;
    244) echo "MySQL/MariaDB: Fatal error in query / syntax" ;;

    # --- MongoDB ---
    251) echo "MongoDB: Connection failed (server not running)" ;;
    252) echo "MongoDB: Authentication failed (bad user/password)" ;;
    253) echo "MongoDB: Database not found" ;;
    254) echo "MongoDB: Fatal query error" ;;

    # --- Proxmox Custom Codes ---
    200) echo "Custom: Failed to create lock file" ;;
    203) echo "Custom: Missing CTID variable" ;;
    204) echo "Custom: Missing PCT_OSTYPE variable" ;;
    205) echo "Custom: Invalid CTID (<100)" ;;
    209) echo "Custom: Container creation failed" ;;
    210) echo "Custom: Cluster not quorate" ;;
    214) echo "Custom: Not enough storage space" ;;
    215) echo "Custom: Container ID not listed" ;;
    216) echo "Custom: RootFS entry missing in config" ;;
    217) echo "Custom: Storage does not support rootdir" ;;
    220) echo "Custom: Unable to resolve template path" ;;
    222) echo "Custom: Template download failed after 3 attempts" ;;
    223) echo "Custom: Template not available after download" ;;
    231) echo "Custom: LXC stack upgrade/retry failed" ;;

    # --- Default ---
    *) echo "Unknown error" ;;
    esac
}

# === Error handler ============================================================
error_handler() {
    local exit_code=${1:-$?}
    local command=${2:-${BASH_COMMAND:-unknown}}
    local line_number=${BASH_LINENO[0]:-unknown}

    command="${command//\$STD/}"

    if [[ "$exit_code" -eq 0 ]]; then
        return 0
    fi

    local explanation
    explanation="$(explain_exit_code "$exit_code")"

    printf "\e[?25h"
    echo -e "\n${RD}[ERROR]${CL} in line ${RD}${line_number}${CL}: exit code ${RD}${exit_code}${CL} (${explanation}): while executing command ${YWB}${command}${CL}\n"

    if [[ -n "${DEBUG_LOGFILE:-}" ]]; then
        {
            echo "------ ERROR ------"
            echo "Timestamp : $(date '+%Y-%m-%d %H:%M:%S')"
            echo "Exit Code : $exit_code ($explanation)"
            echo "Line      : $line_number"
            echo "Command   : $command"
            echo "-------------------"
        } >>"$DEBUG_LOGFILE"
    fi

    if [[ -n "${SILENT_LOGFILE:-}" && -s "$SILENT_LOGFILE" ]]; then
        echo "--- Last 20 lines of silent log ($SILENT_LOGFILE) ---"
        tail -n 20 "$SILENT_LOGFILE"
        echo "---------------------------------------------------"
    fi

    exit "$exit_code"
}

# === Exit handler =============================================================
on_exit() {
    local exit_code=$?
    [[ -n "${lockfile:-}" && -e "$lockfile" ]] && rm -f "$lockfile"
    exit "$exit_code"
}

# === Signal handlers ==========================================================
on_interrupt() {
    echo -e "\n${RD}Interrupted by user (SIGINT)${CL}"
    exit 130
}

on_terminate() {
    echo -e "\n${RD}Terminated by signal (SIGTERM)${CL}"
    exit 143
}

# === Init traps ===============================================================
catch_errors() {
    set -Ee -o pipefail
    if [ "${STRICT_UNSET:-0}" = "1" ]; then
        set -u
    fi
    trap 'error_handler' ERR
    trap on_exit EXIT
    trap on_interrupt INT
    trap on_terminate TERM
}