#!/usr/bin/env bash
set -eu

function blacklist-hosts {
  bash -"$-" ~/scripts/blacklist-hosts
}

function clone-dotfiles {
  bash -"$-" ~/scripts/clone-dotfiles
}

function clone-scripts {
  if [[ ! -d ~/scripts/.git ]]; then
    install-packages git
    git clone https://sgtpep@github.com/sgtpep/scripts.git ~/scripts
  fi
}

function configure-grub {
  local checksum=$(md5sum /etc/default/grub)
  grep -q '^GRUB_TIMEOUT_STYLE=' /etc/default/grub || sudo tee -a /etc/default/grub > /dev/null <<< 'GRUB_TIMEOUT_STYLE=hidden'
  sudo sed -i 's/^#*\(GRUB_TERMINAL=\).*/\1console/' /etc/default/grub
  sudo sed -i 's/^\(GRUB_TIMEOUT=\).*/\10/' /etc/default/grub
  md5sum -c --status <<< $checksum || sudo update-grub
}

function configure-initramfs-modules {
  local checksum=$(md5sum /etc/initramfs-tools/modules)
  sudo tee /etc/initramfs-tools/modules > /dev/null <<< 'i915'
  md5sum -c --status <<< $checksum || sudo update-initramfs -u
}

function disable-console-font {
  sudo sed -i 's/^\(FONTFACE=\).*/\1""/' /etc/default/console-setup
}

function disable-power-key {
  sudo sed -i 's/^#\(HandlePowerKey=\).*/\1ignore/' /etc/systemd/logind.conf
}

function enable-backports {
  if [[ ! -f /etc/apt/sources.list.d/backports.list ]]; then
    sudo tee /etc/apt/sources.list.d/backports.list > /dev/null <<< "deb http://deb.debian.org/debian $(lsb_release -cs)-backports main"
    sudo apt update -o APT::Get::List-Cleanup=0 -o Dir::Etc::sourcelist=sources.list.d/backports.list -o Dir::Etc::sourceparts=-
  fi
}

function enable-backports-contrib {
  if [[ ! -f /etc/apt/sources.list.d/backports-contrib.list ]]; then
    sudo tee /etc/apt/sources.list.d/backports-contrib.list > /dev/null <<< "deb http://deb.debian.org/debian $(lsb_release -cs)-backports contrib"
    sudo apt update -o APT::Get::List-Cleanup=0 -o Dir::Etc::sourcelist=sources.list.d/backports-contrib.list -o Dir::Etc::sourceparts=-
  fi
}

function enable-fstrim {
  sudo ln -fs /usr/share/doc/util-linux/examples/fstrim.service /etc/systemd/system
  sudo systemctl enable /usr/share/doc/util-linux/examples/fstrim.timer
}

function install-packages {
  dpkg -s "${@%/*}" &> /dev/null || sudo DEBIAN_FRONTEND=noninteractive apt install -y "$@"
}

function install-pulseaudio {
  install-packages pavucontrol pulseaudio
}

function install-standalone-packages {
  local packages=(
    acpi
    apcalc
    connman
    curl
    gimp
    git
    gmrun
    gphoto2
    htop
    mosh
    mpv
    ncdu
    openbox
    rsync
    s3fs
    silversearcher-ag
    suckless-tools
    sxiv
    tmux
    unattended-upgrades
    unclutter
    vifm
    wmctrl
    xbindkeys
    xsel
  )
  install-packages "${packages[@]}"
}

function main {
  clone-scripts
  setup-system
  install-standalone-packages
}

function setup-acpid {
  install-packages acpid
  sudo tee /etc/acpi/handler.sh > /dev/null << \EOF
#!/usr/bin/env bash
set -eu
if [[ $1 == video/brightness* ]]; then
  cd /sys/class/backlight
  cd ./intel_backlight 2> /dev/null || cd ./acpi_video0
  declare -A signs=([video/brightnessdown]=- [video/brightnessup]=+)
  echo "$(($(< ./brightness) ${signs[$1]} $(< ./max_brightness) / 50))" > ./brightness
fi
EOF
}

function setup-chromium {
  install-packages chromium
  sudo update-alternatives --set x-www-browser /usr/bin/chromium
}

function setup-devmon {
  install-packages udevil zenity-
  sudo cp /usr/lib/x86_64-linux-gnu/systemd/system/devmon@.service /etc/systemd/system
  sudo systemctl enable devmon@"$USER"
}

function setup-firejail {
  install-packages firejail/"$(lsb_release -cs)"-backports libgconf-2-4
  sudo tee /etc/firejail/default.local > /dev/null <<< 'protocol unix,inet,inet6,netlink'
}

function setup-lightdm {
  install-packages lightdm
  sudo sed -i "s/^#\(autologin-user=\).*/\1$USER/" /etc/lightdm/lightdm.conf
}

function setup-sshuttle {
  install-packages sshuttle
  sudo tee /etc/sudoers.d/sshuttle > /dev/null <<< "$USER ALL = NOPASSWD: SETENV: /usr/bin/python3 /usr/bin/sshuttle --method auto --firewall"
}

function setup-system {
  blacklist-hosts
  clone-dotfiles
  configure-grub
  configure-initramfs-modules
  disable-console-font
  disable-power-key
  enable-backports
  enable-fstrim
  install-pulseaudio
  setup-acpid
  setup-chromium
  setup-devmon
  setup-firejail
  setup-lightdm
  setup-sshuttle
  setup-urxvt
  setup-vim
  setup-virtualbox-guest
  setup-xorg
}

function setup-urxvt {
  install-packages rxvt-unicode
  sudo update-alternatives --set x-terminal-emulator /usr/bin/urxvt
}

function setup-vim {
  install-packages vim-gtk
  sudo update-alternatives --set editor /usr/bin/vim.gtk
}

function setup-virtualbox-guest {
  if [[ $(< /sys/class/dmi/id/product_name) == VirtualBox ]]; then
    enable-backports-contrib
    install-packages virtualbox-guest-x11/"$(lsb_release -cs)"-backports
    sudo usermod -a -G vboxsf "$USER"
  fi
}

function setup-xorg {
  install-packages dbus-x11 xorg
  sudo sed -i 's/^\(XKBLAYOUT=\).*/\1"us,ru"/' /etc/default/keyboard
  sudo sed -i 's/^\(XKBOPTIONS=\).*/\1"ctrl:nocaps,grp:rctrl_toggle,grp:switch,lv3:lwin_switch,misc:typo"/' /etc/default/keyboard
}

main "$@"