#!/bin/bash

# The purpose of this script is to setup our UPnP AV/DLNA renderer 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 copy this script as well as conf-sync.sh to /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

  wget -P /usr/share/keyrings/ https://www.lesbonscomptes.com/pages/lesbonscomptes.gpg
  wget -P /etc/apt/sources.list.d/ https://www.lesbonscomptes.com/upmpdcli/pages/upmpdcli-rbullseye.list
  sed -i -e "s/deb-src/#deb-src/g" /etc/apt/sources.list.d/upmpdcli-rbullseye.list

  apt update
  apt upgrade -y
  apt install -y vim tree tmux neofetch mpd upmpdcli
}

add_users() {
  echo "Adding users"
  useradd -U -G sudo -m -s /bin/bash $user
  chmod 700 /home/$user
}

get_conf() {
  echo "Getting configuration"
  sudo -H -u $user mkdir $sync_directory_path
  cp $run_directory_path/conf-sync.sh $sync_directory_path/
  chown $user:$user $sync_directory_path/conf-sync.sh
  sudo -H -u $user chmod u+x $sync_directory_path/conf-sync.sh
  sudo -H -u $user $sync_directory_path/conf-sync.sh
}

set_conf() {
  echo "Setting configuration"
  ln -s $sync_directory_path/*.service $systemd_units_path/
  ln -s $sync_directory_path/*.timer $systemd_units_path/
  systemctl daemon-reload
  systemctl enable conf-sync.timer mpd.service upmpdcli.service restart-upmpdcli.timer
}

set_upmpdcli_service() {
  echo "Setting custom upmpdcli service unit"
  mkdir $systemd_units_path/upmpdcli.service.d
  echo "[Service]" > $systemd_units_path/upmpdcli.service.d/exec.conf
  echo "ExecStart=" >> $systemd_units_path/upmpdcli.service.d/exec.conf
  echo "ExecStart=/usr/bin/upmpdcli -f %H" >> $systemd_units_path/upmpdcli.service.d/exec.conf
}

set_alsa_conf() {
  echo "Setting ALSA configuration"
  echo "defaults.pcm.card $audio_device" > $alsa_conf_file_path
  echo "defaults.ctl.card $audio_device" >> $alsa_conf_file_path
}

set_cpufreq() { # This is specifically for our Orange Pi Zero; may not be required in all cases
  echo "Setting CPU frequency to performance"
  sed -i -e "s/GOVERNOR=ondemand/GOVERNOR=performance/g" /etc/default/cpufrequtils
}

rcs_links() {
  echo "Linking rcs"
  rm /home/$user/.bashrc
  rm /root/.bashrc
  sudo -H -u $user ln -s $sync_directory_path/bashrc /home/$user/.bashrc
  ln -s /home/$user/.bashrc /root/.bashrc
  sudo -H -u $user ln -s $sync_directory_path/vimrc /home/$user/.vimrc
  ln -s /home/$user/.vimrc /root/.vimrc
  sudo -H -u $user ln -s $sync_directory_path/tmux.conf /home/$user/.tmux.conf
  ln -s /home/$user/.tmux.conf /root/.tmux.conf
}

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
}

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

echo "You are about to deploy uPnP renderer."
run_directory_path=$(pwd)

# Set parameters
default_hostname='orangepizero'
hostname='pi2'
fqdn='pi2.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'
audio_device='0'
alsa_conf_file_path='/etc/asound.conf'
remote_pubkey_location='https://keys.kto.black'
remote_pubkey='home.pub'

# Main process
# You should comment below what you do not want to happen
init
install_packages
add_users
get_conf
set_conf
set_upmpdcli_service
set_alsa_conf
set_cpufreq
rcs_links
ssh_pubkey

echo ""
echo "We're all good here!"
echo "You should now:"
echo "* set $user's password"
echo "* lock root account"
echo "* remove setup.sh and conf-sync.sh"
echo "* reboot the SBC"
echo "And perhaps:"
echo "* set htop at your convenience"
echo "* use below commands to edit SSH config:"
echo "    sed -i 's/PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config"
echo "    sed -i 's/#PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config"
echo "* set up Wi-Fi connection"
echo "  * and then you may want to check on $sync_directory_path/auto-disable-wifi.sh"
echo "Please also note that default audio device has been set to $audio_device"
echo "If you wish to change this, you may edit /etc/asound.conf"
exit 0