#!/bin/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=2.3.2

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

# force bash to not showing code manually.


# checking interopability
grep enabled /proc/sys/fs/binfmt_misc/WSLInterop >/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}"
input_info="${cyan}[input]${reset}"
error="${red}[error]${reset}"
warn="${orange}[warn]${reset}"
debug="${orange}${bold}[debug]${reset}"

## Windows build number constant
readonly BN_SPR_CREATORS=15063		#1703, Redstone 2, Creators Update
readonly BN_FAL_CREATORS=16299		#1709, Redstone 3, Fall Creators Update
readonly BN_APR_EIGHTEEN=17134		#1803, Redstone 4, April 2018 Update
readonly BN_OCT_EIGHTEEN=17763		#1809, Redstone 5, October 2018 Update
readonly BN_MAY_NINETEEN=18362		#1903, 19H1, May 2019 Update

# functions

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

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

function double_dash_p {
	echo "${@//\\/\\\\}"
}

function interop_prefix {
	if [ -f /etc/wsl.conf ]; then
		tmp=$(awk -F '=' '/root/ {print $2}' /etc/wsl.conf | awk '{$1=$1;print}')
		if [ "$tmp" == "" ]; then
			echo "/mnt/"
		else
			echo "$tmp"
		fi
	else
		echo "/mnt/"
	fi
}

function chcp_com {
	"$(interop_prefix)"c/Windows/System32/chcp.com "$@" >/dev/null
}

function winps_exec {
	chcp_com $(cat ~/.config/wslu/oemcp)
	"$(interop_prefix)"c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -NoProfile -NonInteractive -Command "$@"
	chcp_com 65001
}

# first run, saving some information
if [ ! -d ~/.config/wslu ]; then
	mkdir -p ~/.config/wslu
fi
if [ ! -f ~/.config/wslu/oemcp ]; then
	"$(interop_prefix)"c/Windows/System32/reg.exe query "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Nls\\CodePage" /v OEMCP 2>&1 | sed -n 3p | sed -e 's|\r||g' | grep -o '[[:digit:]]*' > ~/.config/wslu/oemcp
fi

if [ ! -f ~/.config/wslu/baseexec ] || [ -z "$(cat ~/.config/wslu/baseexec)" ]; then
	wslutmpbuild=$(reg.exe query "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion" /v CurrentBuild | tail -n 2 | head -n 1 | sed -e 's|\r||g')
	wslutmpbuild=${wslutmpbuild##* }
	wslutmpbuild="$(( $wslutmpbuild + 0 ))"
	if [ $wslutmpbuild -ge $BN_MAY_NINETEEN ]; then
		wslu_distro_regpath=$("$(interop_prefix)"c/Windows/System32/reg.exe query "HKCU\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Lxss" /s /f DistributionName 2>&1 | grep -B1 -e "$WSL_DISTRO_NAME" | head -n1 | sed -e 's|\r||g')
		wslu_distro_packagename=$($(interop_prefix)c/Windows/System32/reg.exe query "$wslu_distro_regpath" /v PackageFamilyName | tail -n 2 | head -n 1 | sed -e 's|\r||g')
		wslu_distro_packagename=${wslu_distro_packagename##* }
                distro_path_win=$(winps_exec 'Write-Output $Env:LOCALAPPDATA' | tr -d '\r')\\Microsoft\\WindowsApps\\$wslu_distro_packagename
                distro_path=$(wslpath "$distro_path_win")
		find "$distro_path" -name "*.exe" > ~/.config/wslu/baseexec
	else
		echo "$(wslpath "C:\\Windows\\System32\\wsl.exe")" > ~/.config/wslu/baseexec
	fi
fi

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

# basic distro detection
distro="$(head -n1 /etc/os-release | sed -e 's/NAME=\"//g')"
case $distro in
	*Pengwin*) distro="pengwin";;
	*WLinux*) distro="wlinux";;
	Ubuntu*) distro="ubuntu";;
	*Debian*) distro="debian";;
	*Kali*) distro="kali";;
	openSUSE*) distro="opensuse";;
	SLES*) distro="sles";;
	Alpine*) distro="alpine";;
	Arch*) distro="archlinux";;
	*Oracle*) distro="oracle";;
	Scientific*) distro="scilinux";;
	*Fedora*) distro="fedora";;
	*Generic*) [ "fedora" == "$(grep -e "LIKE=" /etc/os-release | sed -e 's/ID_LIKE=//g')" ] && distro="oldfedora" || distro="unknown";;
	*) distro="unknown";;
esac
version="09"

##########   CAUTION   ###########
## wslupath is a legacy cli for backward compatbility.
## Use it unless it is necessary.

style=1
reg_path=0
set_path=""

help_short="wslupath (-dOr) [-D|-A|-T|-S|-W|-s|-su|-H|-P|...NAME...]\nwslupath (-h|-v|-R)"

function path_double_dash {
	new_path="${*//\\/\\\\}"
	echo "$new_path"
}

function general_converter {
	target="$*"

	if [[ $target =~ ^[A-Z]:(\\[^:\\]+)*(\\)?$ ]]; then
		p=$(wslpath -u "${target}")
	elif [[ $target =~ ^$(interop_prefix)[A-Za-z](/[^/]+)*(/)?$ ]]; then
		p=$(wslpath -w "${target}")
	else
		echo "${error} No proper path form detected: ""$*""."
		exit 20
	fi
	echo "$p"
}

function style_path {
	case $style in
		1)p="$(general_converter "$@")";;
		2)p="$*";;
		3)p="$(path_double_dash "$@")";;
	esac
	echo "$p"
}

if [[ $# -eq 0 ]]; then
	echo -e "$help_short"
	exit 20
else
	for args; do
		case $args in
			#styles
			-r|--reg-data)reg_path=1;;
			-O|--original)style=2;;
			-d|--doubledash-dir)style=3;;
			## system location

			-D|--desktop)
			set_path="$(style_path "$(wslvar -l 'Desktop')")"
			break;;
			-A|--appdata)
			set_path="$(style_path "$(wslvar -s APPDATA)")"
			break;;
			-T|--temp)
			set_path="$(style_path "$(wslvar -s TMP)")"
			break;;
			-S|--sysdir)
			set_path="$(style_path "$(wslvar -s windir)"\\System32)"
			break;;
			-W|--windir)
			set_path="$(style_path "$(wslvar -s windir)")"
			break;;
			-s|--start-menu)
			set_path="$(style_path "$(wslvar -l 'Start Menu')")"
			break;;
			-su|--startup)
			set_path="$(style_path "$(wslvar -l 'Startup')")"
			break;;
			-H|--home)
			set_path="$(style_path "$(wslvar HOMEDRIVE)""$(wslvar HOMEPATH)")"
			break;;
			-P|--program-files)
			set_path="$(style_path "$(wslvar -s ProgramFiles)")"
			break;;
			-h|--help) help "$0" "$help_short"; exit;;
			-v|--version)echo "wslu v$wslu_version; wslupath v$version"; exit;;
			-R|--avail-reg) echo "Available registery input:"
			wslvar -L
			exit;;
			*)
			if [[ "$reg_path" == "1" ]]; then
				set_path="$(style_path "$(wslvar -l "$args")")"
			else
				set_path="$(style_path "$args")"
			fi
			break;;
		esac
	done
fi

if [[ "$set_path" == "" ]]; then
	echo "${error}No path input. Aborted."
	exit 21
else
	echo "$set_path"
fi
