#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (c) 2025 LUXIM d.o.o., Slovenia
# Author: Matjaž Mozetič
#
# Name: backtunnel-open-term
# Summary: Open a command in the user's available terminal emulator, with logging and simple rotation.
# Description:
#   Detects an installed terminal emulator (preferring Konsole on KDE sessions), opens it,
#   and executes the provided command with arguments. Logs session metadata and output to
#   ${XDG_STATE_HOME:-$HOME/.local/state}/backtunnel/servicemenu.<timestamp>.log, keeping the
#   last 10 logs with a portable rotation routine.
#
# Usage:
#   backtunnel-open-term <cmd> [args...]
#
# Examples:
#   backtunnel-open-term backtunnel-access-tui "/path/to/dir"
#   backtunnel-open-term bash -lc 'echo Hello'
#
# Dependencies:
#   - bash
#   - A terminal emulator (one of: konsole, kitty, alacritty, gnome-terminal, kgx, tilix, xfce4-terminal, xterm)
#   - stat, sort, cut, date (coreutils-compatible)
#
# Exit codes:
#   0  started successfully (or backgrounded if no terminal is available)
#   1+ invalid usage or failures during setup/execution
#
# Notes:
#   - If no terminal emulator is found, the command is started in the background via nohup
#     and the log path is printed.
#   - Uses exec for supported terminals to replace the current process; otherwise prints info then exits.
set -euo pipefail
# ... existing code ...
LOG_DIR="${XDG_STATE_HOME:-$HOME/.local/state}/backtunnel"
[[ -d "$LOG_DIR" ]] || mkdir -p "$LOG_DIR"
LOG_FILE="${LOG_DIR}/servicemenu.$(date +%Y%m%d-%H%M%S).log"

# Simple rotation: keep the last 10 files (portable, avoids SC2207 and xargs -r)
# Purpose: remove older log files while remaining compatible across GNU/BSD userlands.
shopt -s nullglob
logs=( "$LOG_DIR"/servicemenu.*.log )
if (( ${#logs[@]} > 10 )); then
  pairs=()
  for f in "${logs[@]}"; do
    # Try GNU stat, then BSD stat; fall back to 0 if neither works
    if mtime=$(stat -c %Y -- "$f" 2>/dev/null); then
      :
    elif mtime=$(stat -f %m -- "$f" 2>/dev/null); then
      :
    else
      mtime=0
    fi
    pairs+=( "$mtime"$'\t'"$f" )
  done
  IFS=$'\n' read -r -d '' -a sorted < <(printf '%s\n' "${pairs[@]}" | sort -rn -k1,1 | cut -f2-; printf '\0')
  for (( i=10; i<${#sorted[@]}; i++ )); do
    rm -f -- "${sorted[i]}"
  done
fi
shopt -u nullglob

cmd=( "$@" )
{
  echo "=== BackTunnel servicemenu ==="
  echo "Time: $(date -Is)"
  echo "PWD:  $(pwd)"
  echo "User: $(id -un) (uid=$(id -u))"
  echo "Cmd:  ${cmd[*]}"
  echo "Env:  BACKTUNNEL_DEBUG=${BACKTUNNEL_DEBUG:-}  SHELL=${SHELL:-}  DISPLAY=${DISPLAY:-}"
  echo

  # detect_term: choose a terminal emulator to launch the command
  # Output: prints the chosen terminal name or empty string if none found.
  # Prefers Konsole when KDE session is detected.
  detect_term() {
    if [[ -n "${KDE_FULL_SESSION:-}" ]] && command -v konsole >/dev/null 2>&1; then
      echo "konsole"; return
    fi
    # Prefer widely used modern terminals first when not on KDE
    for t in wezterm kitty alacritty kgx gnome-terminal tilix xfce4-terminal konsole xterm; do
      if command -v "$t" >/dev/null 2>&1; then echo "$t"; return; fi
    done
    echo ""  # none
  }
  # ... existing code ...
  term="$(detect_term)"
  echo "Chosen terminal: ${term:-<none>}"; echo

  # Prebuild a shell-escaped command for bash -lc cases (preserves args)
  shell_cmd=""
  if (( ${#cmd[@]} )); then
    printf -v shell_cmd '%q' "${cmd[0]}"
    if (( ${#cmd[@]} > 1 )); then
      for a in "${cmd[@]:1}"; do
        printf -v shell_cmd '%s %q' "$shell_cmd" "$a"
      done
    fi
  fi

  # Run command in terminal (use hold/noclose if supported)
  case "$term" in
    konsole)         exec konsole --noclose -e "${cmd[@]}" ;;
    wezterm)         exec wezterm start -- "${cmd[@]}" ;;
    kitty)           exec kitty -e "${cmd[@]}" ;;
    alacritty)       exec alacritty -e "${cmd[@]}" ;;
    gnome-terminal)  exec gnome-terminal -- bash -lc "exec $shell_cmd" ;;
    kgx)             exec kgx -- bash -lc "exec $shell_cmd" ;;  # GNOME Console
    tilix)           exec tilix -e "${cmd[@]}" ;;
    xfce4-terminal)  exec xfce4-terminal -e "${cmd[@]}" ;;
    xterm)           exec xterm -hold -e "${cmd[@]}" ;;
    *)
      echo "No terminal emulator found. Running in background (nohup)."
      nohup "${cmd[@]}" >/dev/null 2>&1 &
      echo "Started in background (pid=$!)."
      echo "Log: $LOG_FILE"
      exit 0
      ;;
  esac
} | tee -a "$LOG_FILE"