#!/bin/sh
# Luke's Auto Rice Boostrapping Script (LARBS)
# by Luke Smith <luke@lukesmith.xyz>
# License: GNU GPLv3

### OPTIONS AND VARIABLES ###

while getopts ":r:p:h" o; do case "${o}" in
	h) printf "Optional arguments for custom use:\\n  -r: Dotfiles repository (local file or url)\\n  -b: Dotfiles branch (master is assumed otherwise)\\n  -p: Dependencies and programs csv (local file or url)\\n  -h: Show this message\\n" && exit ;;
	r) dotfilesrepo=${OPTARG} && git ls-remote "$dotfilesrepo" || exit ;;
	b) repobranch=${OPTARG} ;;
	p) progsfile=${OPTARG} ;;
	*) printf "Invalid option: -%s\\n" "$OPTARG" && exit ;;
esac done

# DEFAULTS:
[ -z "$dotfilesrepo" ] && dotfilesrepo="https://github.com/lukesmithxyz/voidrice.git" && repobranch="voiddwm"
[ -z "$progsfile" ] && progsfile="https://raw.githubusercontent.com/LukeSmithxyz/LARBS/master/progs.csv"
[ -z "$repobranch" ] && repobranch="master"

### FUNCTIONS ###

error() { clear; printf "ERROR:\\n%s\\n" "$1"; exit;}

welcomemsg() { \
	dialog --title "Welcome!" --msgbox "Welcome to Luke's Auto-Rice Bootstrapping Script!\\n\\nThis script will automatically install a fully-featured i3wm Void Linux desktop, which I use as my main machine.\\n\\n-Luke" 10 60
	}

getuserandpass() { \
	# Prompts user for new username an password.
	name=$(dialog --inputbox "First, please enter a name for the user account." 10 60 3>&1 1>&2 2>&3 3>&1) || exit
	while ! echo "$name" | grep "^[a-z_][a-z0-9_-]*$" >/dev/null 2>&1; do
		name=$(dialog --no-cancel --inputbox "Username not valid. Give a username beginning with a letter, with only lowercase letters, - or _." 10 60 3>&1 1>&2 2>&3 3>&1)
	done
	pass1=$(dialog --no-cancel --passwordbox "Enter a password for that user." 10 60 3>&1 1>&2 2>&3 3>&1)
	pass2=$(dialog --no-cancel --passwordbox "Retype password." 10 60 3>&1 1>&2 2>&3 3>&1)
	while ! [ "$pass1" = "$pass2" ]; do
		unset pass2
		pass1=$(dialog --no-cancel --passwordbox "Passwords do not match.\\n\\nEnter password again." 10 60 3>&1 1>&2 2>&3 3>&1)
		pass2=$(dialog --no-cancel --passwordbox "Retype password." 10 60 3>&1 1>&2 2>&3 3>&1)
	done ;}

usercheck() { \
	! (id -u "$name" >/dev/null) 2>&1 ||
	dialog --colors --title "WARNING!" --yes-label "CONTINUE" --no-label "No wait..." --yesno "The user \`$name\` already exists on this system. LARBS can install for a user already existing, but it will \\Zboverwrite\\Zn any conflicting settings/dotfiles on the user account.\\n\\nLARBS will \\Zbnot\\Zn overwrite your user files, documents, videos, etc., so don't worry about that, but only click <CONTINUE> if you don't mind your settings being overwritten.\\n\\nNote also that LARBS will change $name's password to the one you just gave." 14 70
	}

preinstallmsg() { \
	dialog --title "Let's get this party started!" --yes-label "Let's go!" --no-label "No, nevermind!" --yesno "The rest of the installation will now be totally automated, so you can sit back and relax.\\n\\nIt will take some time, but when done, you can relax even more with your complete system.\\n\\nNow just press <Let's go!> and the system will begin installation!" 13 60 || { clear; exit; }
	}

adduserandpass() { \
	# Adds user `$name` with password $pass1.
	dialog --infobox "Adding user \"$name\"..." 4 50
	useradd -m -G wheel,users,audio,video,cdrom,input -s /bin/bash "$name" >/dev/null 2>&1 ||
	usermod -a -G wheel,users,audio,video,chrom,input "$name" && mkdir -p /home/"$name" && chown "$name":wheel /home/"$name"
	echo "$name:$pass1" | chpasswd
	unset pass1 pass2 ;}

maininstall() { # Installs all needed programs from main repo.
	dialog --title "LARBS Installation" --infobox "Installing \`$1\` ($n of $total). $1 $2" 5 70
	xbps-install -y "$1" >/dev/null 2>&1
	}

gitmakeinstall() {
	repo="$(basename "$1")"
	repodir="/home/$name/repos/$repo"
	dialog --title "LARBS Installation" --infobox "Installing \`$(basename "$1")\` ($n of $total) via \`git\` and \`make\`. $(basename "$1") $2" 5 70
	sudo -u "$name" mkdir -p "$repodir"
	sudo -u "$name" git clone --depth 1 "$1" "/home/$name/repos/$repo" >/dev/null 2>&1
	cd "$repodir" || exit
	make install >/dev/null 2>&1
	cd /tmp || return ;}

pipinstall() { \
	dialog --title "LARBS Installation" --infobox "Installing the Python package \`$1\` ($n of $total). $1 $2" 5 70
	command -v pip || pacman -S --noconfirm --needed python-pip >/dev/null 2>&1
	yes | pip install "$1"
	}

installationloop() { \
	([ -f "$progsfile" ] && cp "$progsfile" /tmp/progs.csv) || curl -Ls "$progsfile" | sed '/^#/d' > /tmp/progs.csv
	total=$(wc -l < /tmp/progs.csv)
	while IFS=, read -r tag program comment; do
		n=$((n+1))
		echo "$comment" | grep "^\".*\"$" >/dev/null 2>&1 && comment="$(echo "$comment" | sed "s/\(^\"\|\"$\)//g")"
		case "$tag" in
			"") maininstall "$program" "$comment" ;;
			"G") gitmakeinstall "$program" "$comment" ;;
			"P") pipinstall "$program" "$comment" ;;
		esac
	done < /tmp/progs.csv ;}

putgitrepo() { # Downlods a gitrepo $1 and places the files in $2 only overwriting conflicts
	[ -z "$3" ] && branch="master" || branch="$repobranch"
	dialog --infobox "Downloading and installing config files..." 4 60
	dir=$(mktemp -d)
	[ ! -d "$2" ] && mkdir -p "$2" && chown -R "$name:wheel" "$2"
	chown -R "$name:wheel" "$dir"
	sudo -u "$name" git clone -b "$branch" --depth 1 "$1" "$dir/gitrepo" >/dev/null 2>&1 &&
	sudo -u "$name" cp -rfT "$dir/gitrepo" "$2"
	}

serviceinit() { for service in "$@"; do
	dialog --infobox "Enabling \"$service\"..." 4 40
	ln -s "/etc/sv/$service" /var/service/
	sv start "$service"
	done ;}

systembeepoff() { dialog --infobox "Getting rid of that retarded error beep sound..." 10 50
	rmmod pcspkr
	echo "blacklist pcspkr" > /etc/modprobe.d/nobeep.conf ;}

finalize(){ \
	dialog --infobox "Preparing welcome message..." 4 50
	echo "exec_always --no-startup-id notify-send -i ~/.scripts/larbs.png 'Welcome to LARBS:' 'Press Super+F1 for the manual.' -t 10000"  >> "/home/$name/.config/i3/config"
	dialog --title "All done!" --msgbox "Congrats! Provided there were no hidden errors, the script completed successfully and all the programs and configuration files should be in place.\\n\\nTo run the new graphical environment, log out and log back in as your new user, then run the command \"startx\" to start the graphical environment (it will start automatically in tty1).\\n\\n.t Luke" 12 80
	}

### THE ACTUAL SCRIPT ###

### This is how everything happens in an intuitive format and order.

# Check if user is root on Arch distro. Install dialog.
xbps-install -Syu dialog

# Welcome user.
welcomemsg || error "User exited."

# Get and verify username and password.
getuserandpass || error "User exited."

# Give warning if user already exists.
usercheck || error "User exited."

# Last chance for user to back out before install.
preinstallmsg || error "User exited."

### The rest of the script requires no user input.

adduserandpass || error "Error adding username and/or password."

dialog --title "LARBS Installation" --infobox "Installing \`basedevel\` and \`git\` for installing other software." 5 70
xbps-install -y curl base-devel git >/dev/null 2>&1

# The command that does all the installing. Reads the progs.csv file and
# installs each needed program the way required. Be sure to run this only after
# the user has been created and has priviledges to run sudo without a password
# and all build dependencies are installed.
installationloop

# Install the dotfiles in the user's home directory
putgitrepo "$dotfilesrepo" "/home/$name" "$repobranch"
rm -f "/home/$name/README.md" "/home/$name/LICENSE"

# Install vim `plugged` plugins.
sudo -u "$name" mkdir -p "/home/$name/.config/nvim/autoload"
curl "https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim" > "/home/$name/.config/nvim/autoload/plug.vim"
dialog --infobox "Installing (neo)vim plugins..." 4 50
(sleep 30 && killall nvim) &
sudo -u "$name" nvim -E -c "PlugUpdate|visual|q|q" >/dev/null 2>&1

# Enable services here.
serviceinit alsa NetworkManager wpa_supplicant

# Most important command! Get rid of the beep!
systembeepoff

# Last message! Install complete!
finalize
clear