#!/usr/bin/bash

if [ "$EUID" -ne 0 ]
	then echo "Please run as root"
	exit 1
fi

SCRIPT_DIR="$(cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd)/"
VIEWER="tmuxviewer"
SSHD_CONFIG_FOLDER="/etc/ssh/sshd_config.d/"
CONFIG_FILE="$VIEWER.conf"
CONFIG_FILE_PATH="$SSHD_CONFIG_FOLDER$CONFIG_FILE"
BIN_FOLDER="/usr/bin/"
VIEWER_BIN="tmux_viewer.sh"
BROADCAST_BIN="tmux_broadcast.sh"

function install_tmuxviewer () {
	sudo apt install -y tmux openssh-server 
	echo "adding $VIEWER_BIN and $BROADCAST_BIN to $BIN_FOLDER"
	sudo cp $SCRIPT_DIR$VIEWER_BIN $BIN_FOLDER$VIEWER_BIN
	sudo cp $SCRIPT_DIR$BROADCAST_BIN $BIN_FOLDER$BROADCAST_BIN
	echo "adding user $VIEWER"
	sudo useradd --home /tmp/$VIEWER --shell /usr/bin/tmux_viewer.sh $VIEWER
	echo "unsetting password for $VIEWER"
	sudo passwd -d $VIEWER 1> /dev/null
	sudo mkdir -p $SSHD_CONFIG_FOLDER
	sudo echo -e "Match User $VIEWER\n\tPermitEmptyPasswords yes" > $CONFIG_FILE_PATH
	#sudo systemctl restart sshd.service
}

function uninstall_tmuxviewer () {
	echo "removing user $VIEWER"
	sudo userdel $VIEWER
	sudo rm $CONFIG_FILE_PATH
	sudo rm $BIN_FOLDER$VIEWER_BIN
	sudo rm $BIN_FOLDER$BROADCAST_BIN
}

case $1 in
	install)
		uninstall_tmuxviewer 2> /dev/null
		install_tmuxviewer
		;;
	uninstall)
		uninstall_tmuxviewer
		;;
	*)
		echo "usage (as root): $0 [install|uninstall]"
		;;
esac