#!/bin/sh

# Preliminary sanity checks
[ $(id -u) != 0 ] && echo "Please run this installer as root." && exit 1
[ $0 != ./install ] && echo "Not launched from repository root." && exit 1

# Functions
mkconfig(){
	echo "Please get your credentials from https://my.telegram.org."
	read -p "App API ID (api_id): " api_id
	read -p "App API hash (api_hash): " api_hash
	read -p "Your user ID: " myid
	read -p "Do you wish to use a log chat? (y/n): " logrpl
	if [ "$logrpl" = "y" ]
	then
		read -p "Log chat ID (logchat): " logchat
	else
		logchat="'me'"
	fi
	echo "api_id = $api_id" >> config.py
	echo "api_hash = '$api_hash'" >> config.py
	echo "myid = $myid" >> config.py
	echo "logchat = $logchat" >> config.py
}

mkuser(){
	# Create user account, distro mess awaits here...
	# Debian has both useradd and adduser
	if [ -e /sbin/useradd ]
	then
		useradd -r bot
		return 0
	fi
	# Alpine only has adduser (Busybox)
	if [ -e /sbin/adduser ]
	then
		adduser -S bot
		return 0
	fi
}

addfiles(){
	# Install executable and config
	install -dm770 -o root -g bot /var/ubot
	install -m640 -o root -g bot config.py /var/ubot/config.py
	install -m755 -o root -g root bin/ubot /usr/bin/ubot

	# Install service files on installed inits
	if [ -e /sbin/openrc ]
	then
		install -m755 init/openrc /etc/init.d/ubot
		ln -s /sbin/openrc /etc/periodic/15min/openrc
	elif [ -e /lib/systemd/systemd ]
	then
		install -m644 init/systemd /etc/systemd/system/ubot.service
	fi
}

# Install dependencies
[ $(which apt) ] && apt install python3-pip
[ $(which apk) ] && apk add py3-pip
pip3 install -U telethon
# Generate config if not built yet
[ ! -f config.py ] && mkconfig
# Create a new user
mkuser
# Install files if config is (now) present
[ -f config.py ] && addfiles

# Run Telethon for the first time
echo "Please log in to Telegram now."
echo "Afterwards you can hit Ctrl-C and start the ubot service."
umask 0077
su bot -s /usr/bin/ubot

return 0