#!/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."
	echo "See readme.md for more info."
	read -p "App API ID (api_id): " api_id
	read -p "App API hash (api_hash): " api_hash
	read -p "Your user ID: " myid

	echo "api_id = $api_id" >> config.py
	echo "api_hash = '$api_hash'" >> config.py
	echo "myid = $myid" >> config.py
}

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

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

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

setup(){
	install -m500 -o telelog -g telelog bin/setup /tmp/setup
	su telelog -s /usr/bin/python3 /tmp/setup
	rm /tmp/setup
}

# 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
umask 0077
[ -f bin/setup ] && setup

# Start the service
service telelog start

return 0