#!/bin/sh

# Exit immediately if a command exits with a non-zero status
set -e

# Exit if an undefined variable is referenced
set -u


# OS Detection
UNAME_OS=$(uname -s)
case $UNAME_OS in
  Linux)
    OS_TYPE=$(. /etc/os-release 2>/dev/null && printf "%s" "$ID" || printf "unknown")
    ;;
  Darwin)
    OS_TYPE='darwin'
    ;;
  Unix)
    OS_TYPE=$(. /etc/os-release 2>/dev/null && printf "%s" "$ID" || printf "unknown")
    ;;
  Win32NT)
    OS_TYPE='windows'
    ;;
  *)
    OS_TYPE='unknown'
    ;;
esac
case $OS_TYPE in
  ubuntu)
    OS_TYPE_NAME='Ubuntu'
    ;;
  debian)
    OS_TYPE_NAME='Debian'
    ;;
  fedora)
    OS_TYPE_NAME='Fedora'
    ;;
  centos)
    OS_TYPE_NAME='CentOS'
    ;;
  rhel)
    OS_TYPE_NAME='Red Hat Enterprise Linux'
    ;;
  alpine)
    OS_TYPE_NAME='Alpine Linux'
    ;;
  arch)
    OS_TYPE_NAME='Arch Linux'
    ;;
  darwin)
    OS_TYPE_NAME='macOS'
    ;;
  windows)
    OS_TYPE_NAME='Windows'
    ;;
  *)
    OS_TYPE_NAME='Unknown'
    ;;
esac
printf '%s\n' "Detected OS Type: $OS_TYPE"
printf '%s\n' "OS Name: $OS_TYPE_NAME"


# Disk Space Check
TOTAL_SPACE_GB=$(df -k -P '/' 2>/dev/null | awk 'NR==2 {print int($2/1048576)}' || echo 0)
AVAILABLE_SPACE_GB=$(df -k -P '/' 2>/dev/null | awk 'NR==2 {print int($4/1048576)}' || echo 0)
printf "\033[36m%s\033[0m\n" "Total Disk Space: $TOTAL_SPACE_GB GB"
printf "\033[36m%s\033[0m\n" "Available Disk Space: $AVAILABLE_SPACE_GB GB"