#!/usr/bin/env bash
# wslu - Windows 10 linux Subsystem Utility
# Component of Windows 10 linux Subsystem Utility
# <https://github.com/wslutilities/wslu>
# Copyright (C) 2019 Patrick Wu
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Version
wslu_version=2.0.0

# Speed up script by not using unicode.
LC_ALL=C
LANG=C

# force bash to not showing code manually.
set +x

# checking interopability
#cat /proc/sys/fs/binfmt_misc/WSLInterop | grep enabled >/dev/null || (echo "WSL Interopability is disabled. Please enable it before using WSL."; exit 1)

# variables
## color
black=`echo -e '\e[30m'`
red=`echo -e '\e[31m'`
green=`echo -e '\e[32m'`
brown=`echo -e '\e[33m'`
blue=`echo -e '\e[34m'`
purple=`echo -e '\e[35m'`
cyan=`echo -e '\e[36m'`
yellow=`echo -e '\e[1;33m'`
white=`echo -e '\e[1;37m'`
dark_gray=`echo -e '\e[1;30m'`
light_red=`echo -e '\e[1;31m'`
light_green=`echo -e '\e[1;32m'`
light_blue=`echo -e '\e[1;34m'`
light_purple=`echo -e '\e[1;35m'`
light_cyan=`echo -e '\e[1;36m'`
light_gray=`echo -e '\e[37m'`
orange=`echo -e '\e[38;5;202m'`
light_orange=`echo -e '\e[38;5;214m'`
bold=`echo -e '\033[1m'`
reset=`echo -e '\033(B\033[m'`

## indicator
info="${green}[info]${reset}"
error="${red}[error]${reset}"
warn="${orange}[warn]${reset}"
debug="${orange}${bold}[debug]${reset}"

# functions

function help {
	echo -e "`basename "$1"` - Part of wslu, a collection of utilities for Windows 10 Windows Subsystem for Linux
Usage: $2

For more help for `basename "$1"`, visit the following site: https://github.com/wslutilities/wslu/wiki/`basename "$1"`"
}

function double_dash_p {
	echo "$(echo $@ | sed -e 's|\\|\\\\|g')"
}

function interop_prefix {
	if [ -f /etc/wsl.conf ]; then
		tmp=$(awk -F '=' '/root/ {print $2}' /etc/wsl.conf)
		if [ "$tmp" == "" ]; then
			echo "/mnt/"
		else
			echo $tmp
		fi
	else
		echo "/mnt/"
	fi
}

function winps_exec {
	$(interop_prefix)c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -NoProfile -NonInteractive -Command $@
}

# when --debug, debug.
if [ "$1" == "--debug" ]; then
	echo "${debug}Debug Mode Enabled."
	shift
	set -x
fi

# basic distro detection
distro="$(cat /etc/os-release | head -n1 | sed -e 's/NAME=\"//g')"
case $distro in
    *WLinux*) distro="wlinux";;
    Ubuntu*) distro="ubuntu";;
    *Debian*) distro="debian";;
    *Kali*) distro="kali";;
    openSUSE*) distro="opensuse";;
    SLES*) distro="sles";;
    Alpine*) distro="alpine";;
    Arch*) distro="archlinux";;
    Scientific*) distro="scilinux";;
    *Fedora*) distro="fedora";;
	*Generic*) [ "fedora" == "$(cat /etc/os-release | grep -e "LIKE=" | sed -e 's/ID_LIKE=//g')" ] && distro="fedora" || distro="unknown";;
    *) distro="unknown";;
esac
version="28"

help_short="wslsys (-h|-v|-S|-U|-b|-B|-fB|-R|-K|-P) -s"

## Windows 10 information
branch=`winps_exec "(Get-ItemProperty 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion').'BuildBranch'"`
build=`winps_exec "(Get-ItemProperty 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion').'CurrentBuild'"`
full_build=`winps_exec "(Get-ItemProperty 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion').'BuildLabEx'"`
installdate=`winps_exec "(Get-ItemProperty 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion').'InstallDate'"`

## WSL information
release="$(cat /etc/os-release | grep "PRETTY_NAME=" | sed -e 's/PRETTY_NAME=//g' -e 's/"//g')"
kernel="$(</proc/sys/kernel/ostype) $(</proc/sys/kernel/osrelease)"
uptime=$(</proc/uptime)
uptime=${uptime//.*}
days=$((${uptime}/86400))
hours=$((${uptime}/3600%24))
minutes=$((${uptime}/60%60))
uptime="${days}d ${hours}h ${minutes}m"

### WSL package information
case "$distro" in
	'ubuntu'|'kali'|'debian'|'wlinux')
		packages="$((packages+=$(dpkg --get-selections | grep -cv deinstall$)))";;
	'opensuse'|'sles'|'scilinux'|'fedora')
		packages="$(rpm -qa | wc -l)";;
	'alpine')
		packages=$(apk info | wc -l);;
	'archlinux')
		packages=$(pacman -Qq | wc -l);;
esac

## fedora remix specific information
if [ "$distro" == "fedora" ]; then
	release="Fedora Remix $(cat /etc/os-release | grep -e "^VERSION=" | sed -e 's/\"//g' | sed -e 's/VERSION=//g')"
fi

## Simple printer defined for fetching information
function printer {
	if [[ $2 != "-s" ]]; then
		echo $1
	else
		echo $1 | sed 's/^.*: //'
	fi
}

case $1 in
		-h|--help) help $0 "$help_short"; exit;;
		-v|--version) echo "wslu v$wslu_version; wslsys v$version"; exit;;
		-I|--sys-installdate) printer "Release Install Date: $installdate" $2;exit;;
		-b|--branch) printer "Branch: $branch" $2;exit;;
		-B|--build) printer "Build: $build" $2;exit;;
		-fB|--full-build) printer "Full Build: $full_build" $2;exit;;
		-U|--uptime) printer "Uptime: $uptime" $2;exit;;
		-R|--release) printer "Linux Release: $release" $2;exit;;
		-K|--kernel) printer "Linux Kernel: $kernel" $2;exit;;
		-P|--package) printer "Packages Count: $packages" $2;exit;;
		*) echo -e "Release Install Date: $installdate\nBranch: $branch\nBuild: $build\nFull Build: $full_build\nUptime: $uptime\nLinux Release: $release\nLinux Kernel: $kernel\nPackages Count: $packages";exit;;
esac
