#
# A function for detecting information about the current session, entirely using shell builtins and env variables.
# 
# This file is part of the zuwu project - a general-purpose zsh initialization and utility framework.
# It is not used by zuwu at the moment, but rather is provided to shell script developers as a utility function they can integrate into their own codebases
#
# Authors:
#   memdmp <https://mem.estrogen.zone/>
#

function {
  local session_extensions=()
  local session_base="local"

  # Detect Interactivity & Login State
  local is_interactive=false;
  local is_login=false;
  if [[ $- == *i* ]]; then
    is_interactive=true
  fi
  if [[ $- == *l* ]]; then
    is_login=true
  fi
  if [[ "$is_interactive" && "$is_login" ]]; then
    session_extensions+=(
      interactive
      login
    )
  elif [[ "$is_interactive" ]]; then
    session_extensions+=(interactive)
  elif [[ "$is_login" ]]; then
    session_extensions+=(login)
  else
    session_extensions+=(headless)
  fi

  # Detect if local or remote, and the kind
  if [ -n "$SSH_TTY" ]; then
    session_base=remote
    session_extensions+=(
      ssh
      ssh_tty
    )
  elif [ -n "$SSH_CLIENT" ]; then
    session_base=remote
    session_extensions+=(
      ssh
    )
  else
    # Expensive ssh session detection - spawns a `ps` process. You may want this if you need reliable session type detection
    # case $(ps -o comm= -p "$PPID") in
    #   sshd|*/sshd) session_base=remote; session_extensions+=(ssh);;
    # esac
  fi

  # Join together into a final, content-type-alike variable
  SESSION_TYPE="$session_base/${(j.+.)session_extensions}"
}

# Example use:
# [[ "$SESSION_TYPE+" == *(+|/)interactive+* ]] && echo "Is in interactive session"