#!/usr/bin/env bash

# The purpose of this script is to setup our print-scan server on a blank Armbian.
# This script is to be run as root.

# (Keep in mind that default root password is 1234)
# Flash SBC's SD with Armbian and clone this repository in /root

# YOU SHOULD REMOVE THIS SCRIPT AFTER SETUP

# Functions
init() {
  echo "Starting initialization"
  echo $fqdn > /etc/hostname
  sed -i -e "s/$default_hostname/$fqdn $hostname/g" /etc/hosts
  localectl set-keymap $keymap
  timedatectl set-timezone $timezone
  systemctl disable apt-daily-upgrade.timer
}

install_packages() {
  echo "Starting packages installation"
  sed -i -e "s/$deb_apt_default_repo/$deb_apt_repo/g" /etc/apt/sources.list
  apt update
  apt upgrade -y
  apt install -y vim tree tmux neofetch sane sane-utils hplip apache2
}

add_users() {
  echo "Adding users"
  useradd -U -G sudo,lpadmin -m -s /bin/bash $user
  chmod 700 /home/$user
  echo "Let's define a password for $user as we are about to run sudo with it. It can of course be changed after setup."
  passwd $user
  usermod -a -G lp saned
}

get_sync() {
  echo "Getting and deploying sync configuration"
  sudo -H -u $user mkdir $sync_directory_path
  sudo -H -u $user git clone https://gitea.kto.black/adminconf/printscan-server.git \
    $sync_directory_path/printscan-server
  sudo -H -u $user git clone https://gitea.kto.black/adminconf/rcs-general.git $sync_directory_path/rcs-general
  sudo -H -u $user $sync_directory_path/rcs-general/install.sh
  sudo -H -u $user git clone https://gitea.kto.black/adminconf/conf-sync.git $sync_directory_path/conf-sync
  sudo -H -u $user cp $sync_directory_path/conf-sync/variables.conf.template \
    $sync_directory_path/conf-sync/variables.conf
  sudo -H -u $user sed -i -e "s/\"desktop\"/\"server\"/g" $sync_directory_path/conf-sync/variables.conf
  sudo -H -u $user $sync_directory_path/conf-sync/install.sh
}

set_cups_conf() {
  echo "Setting CUPS configuration"
  mv $cups_conf_path/cupsd.conf $cups_conf_path/cupsd.conf.orig
  cp $run_directory_path/cupsd.conf $cups_conf_path/cupsd.conf
}

set_sane_conf() {
  systemctl enable saned.socket # FIXME that really needed?
}

ssh_pubkey() {
  echo "Getting SSH public key"
  sudo -H -u $user mkdir /home/$user/.ssh
  sudo -H -u $user wget -P /home/$user/.ssh $remote_pubkey_location/$remote_pubkey
  sudo -H -u $user mv /home/$user/.ssh/$remote_pubkey /home/$user/.ssh/authorized_keys
}

set_sshd_conf() {
  echo "Editing OpenSSH daemon config..."
  sed -i -e "s/#PasswordAuthentication yes/PasswordAuthentication no/g" /etc/ssh/sshd_config
  sed -i -e "s/PermitRootLogin yes/PermitRootLogin no/g" /etc/ssh/sshd_config
}

install_scanservjs() {
  echo "Installing scanservjs directly from GitHub..."
  curl -s https://raw.githubusercontent.com/sbs20/scanservjs/master/packages/server/installer.sh | bash -s -- -a
}

tls_cert() {
  echo "Generating TLS certificate"
  openssl req -newkey rsa:4096 -x509 -sha256 -days 999 -nodes -out $tls_directory/$cert -keyout \
    $tls_directory/$cert_key -subj "/C=/ST=/L=/O=/OU=/CN="
  chmod o+r $tls_directory/$cert_key
}

set_apache() {
  echo "Setting up Apache HTTP Server"
  cp $run_directory_path/apache-sites/scanservjs.conf $apache_sites_directory_path/
  a2dissite *
  a2ensite scanservjs
  a2enmod ssl proxy proxy_http proxy_http2
}

# TODO add a firewall rule to prevent access to http:8080 from other than local

# Only run if the user is root
if [[ $USER != 'root' ]] ; then
  echo "You must run this script as root!"
  exit 1
fi

run_directory_path=$(pwd)

# Set parameters
default_hostname='pine64'
hostname='pn1'
fqdn='pn1.hr.kto.black'
keymap='fr'
timezone='Europe/Paris'
deb_apt_default_repo='deb.debian.org'
deb_apt_repo='ftp.fr.debian.org'
user='alex'
sync_directory_path="/home/$user/.sync"
systemd_units_path='/etc/systemd/system'
cups_conf_path='/etc/cups'
remote_pubkey_location='https://keys.kto.black'
remote_pubkey='home.pub'
scanservjs_dest='/srv/scanservjs'
tls_directory='/etc/ssl/'
cert='cert.crt'
cert_key='cert.key'
apache_sites_directory_path='/etc/apache2/sites-available'

# Main process
# You should comment below what you do not want to happen
init
install_packages
add_users
get_conf
set_cups_conf
set_sane_conf
ssh_pubkey
set_sshd_conf
install_scanservjs
tls_cert
set_apache

echo ""
echo "We're all good here!"
echo "You should now:"
echo "* lock root account"
echo "* reboot the SBC"
echo "And perhaps:"
echo "* set a new password for $user"
echo "* connect to http://$hostname:631/ and add a printer"
echo "* set htop at your convenience"
echo "* remove password for sudo" # TODO we should automate that, with a flag
exit 0