{ pkgs, lib, config, ... }:
let
  spotify_info = pkgs.writeBash "spotify.info" ''
    if $(pgrep spotify); then
      STATUS=$(${pkgs.dbus}/bin/dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.freedesktop.DBus.Properties.Get string:'org.mpris.MediaPlayer2.Player' string:'PlaybackStatus'|egrep -A 1 "string"|cut -b 26-|cut -d '"' -f 1|egrep -v ^$)

      if [[ "$STATUS" == 'Playing' ]]; then
        printf '\uf1bc  '
        printf '\uf04b'
      elif [[ "$STATUS" == 'Paused' ]]; then
        printf '\uf1bc  '
        printf '\uf04c'
      elif [[ "$STATUS" == 'Stopped' ]]; then
        printf '\uf1bc  '
        printf '\uf04d'
      else
        exit 1
      fi

      printf '  '

      METADATA=$(${pkgs.dbus}/bin/dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.freedesktop.DBus.Properties.Get string:'org.mpris.MediaPlayer2.Player' string:'Metadata')
      ARTIST=$(echo "$METADATA" | egrep -A 2 "artist" | egrep -v "artist" | egrep -v "array" | cut -b 27- | cut -d '"' -f 1 | egrep -v ^$)
      TITLE=$(echo "$METADATA" | egrep -A 1 "title" | egrep -v "title" | cut -b 44- | cut -d '"' -f 1 | egrep -v ^$)

      printf "%s \u2237 %s" "$ARTIST" "$TITLE"
    fi
  '';
  battery_info = pkgs.writeBash "battery.info" ''
    BAT_DIR="/sys/class/power_supply/$BLOCK_INSTANCE/"
    [ -d $BAT_DIR ] && cd $BAT_DIR || exit 1

    status=$(cat status)
    charge_f=$((100 * $(cat charge_now) / $(cat charge_full)))

    if [[ "$charge_f" -lt 20 ]]; then
      printf '\uf244'
    elif [[ "$charge_f" -lt 40 ]]; then
      printf '\uf243'
    elif [[ "$charge_f" -lt 60 ]]; then
      printf '\uf242'
    elif [[ "$charge_f" -lt 80 ]]; then
      printf '\uf241'
    else
      printf '\uf240'
    fi

    printf '  '

    if [[ "$status" == 'Charging' ]]; then
      printf '\uf106'
    elif [[ "$status" == 'Discharging' ]]; then
      printf '\uf107'
    elif [[ "$status" == 'Full' ]]; then
      printf '\uf0e7'
    else
      printf '[%s]' "$status"
    fi

    printf '  '

    if [[ "$status" != 'Full' ]]; then
      rate_raw=$(($(cat voltage_now) * $(cat power_now)))
      rate=$(bc <<< "scale=1; $rate_raw / 10^12")
      printf '%s\u2009W, ' "$rate"
    fi

    charge_d=$((100 * $(cat charge_now) / $(cat charge_full)))
    printf '%s%%\n' "$charge_d"

    if [[ "$status" == 'Discharging' ]]; then
      if [[ "$charge_d" -lt 10 ]]; then
        printf '\n#E41C28'
      elif [[ "$charge_d" -lt 20 ]]; then
        printf '\n#EEBF13'
      fi
    fi
  '';
  volume_info = pkgs.writeBash "volume.info" ''
    if [[ "$BLOCK_BUTTON" == 1 ]]; then
      ${pkgs.pamixer}/bin/pamixer -i 5
    elif [[ "$BLOCK_BUTTON" == 3 ]]; then
      ${pkgs.pamixer}/bin/pamixer -d 5
    elif [[ "$BLOCK_BUTTON" == 2 ]]; then
      ${pkgs.pamixer}/bin/pamixer -t
    fi

    if $(${pkgs.pamixer}/bin/pamixer --get-mute); then
      printf '\uf026  0%%\n\n#EEBF13'
    else
      volume=$(${pkgs.pamixer}/bin/pamixer --get-volume)
      printf '\uf028  %s%%' "$volume"
    fi
  '';
  fancyDate = pkgs.writeC "fancy_date.c" {} ''
    #include <stdio.h>
    #include <time.h>
    #include <wchar.h>

    int main(void) {
        time_t now = time(NULL);
        struct tm *today = localtime(&now);
        wchar_t roman_month = 0x2160 + today->tm_mon;
        wprintf(L"%d\u2009%lc\u2009%d [%d]\n", today->tm_mday, roman_month, 1900 + today->tm_year, today->tm_yday/7 + 1);
        return 0;
    }
  '';
  i3blocks_conf = with import ../theme.nix; ''
    markup=pango
    align=center
    color=${white}

    [spotify]
    command=${spotify_info}
    interval=2

    [separator]

    [volume]
    command=${volume_info}
    min_width= 100%
    interval=once
    signal=3

    [separator]

    [cpu_usage]
    command=cut -d' ' -f 1-3 < /proc/loadavg
    label=
    interval=2

    [separator]

    [ram_usage]
    command=free -h | grep "Mem" | awk '{print $3}'
    label=
    interval=2
    align=center

    [separator]

    [battery]
    command=${battery_info}
    interval=10
    instance=BAT1

    [separator]

    [date]
    command=${fancyDate}
    interval=1
    label=

    [separator]

    [time]
    command=date +'%H:%M'
    interval=1
    label=

    [separator]
    command=${pkgs.xkblayout-state}/bin/xkblayout-state print %s
    label=
    interval=2

    [separator]
  '';
  i3_conf = with import ../theme.nix; ''
    set $mod Mod4

    font pango:${uiFont.name} ${toString uiFont.size}
    floating_modifier $mod

    hide_edge_borders both
    new_window pixel 1
    new_float  pixel 1

    bindsym $mod+Return exec ${config.defaultApplications.terminal}
    bindsym $mod+y exec ${config.defaultApplications.browser}
    bindsym $mod+t exec ${config.defaultApplications.fileManager}
    bindsym $mod+Shift+w exec ${pkgs.xautolock}/bin/xautolock -locknow
    bindsym $mod+d exec ${pkgs.rofi}/bin/rofi -display-run — -show run
    bindsym $mod+a exec ${pkgs.rofi}/bin/rofi -display-window — -show window

    bindsym $mod+Shift+q kill
    bindsym $mod+Left focus left
    bindsym $mod+Down focus down
    bindsym $mod+Up focus up
    bindsym $mod+Right focus right
    bindsym $mod+p workspace prev
    bindsym $mod+n workspace next
    bindsym $mod+Shift+Left move left
    bindsym $mod+Shift+Down move down
    bindsym $mod+Shift+Up move up
    bindsym $mod+Shift+Right move right
    bindsym $mod+h split h
    bindsym $mod+v split v
    bindsym $mod+f fullscreen toggle
    bindsym $mod+s layout stacking
    bindsym $mod+w layout tabbed
    bindsym $mod+e layout toggle split
    bindsym $mod+Shift+z floating toggle
    bindsym $mod+Shift+c reload
    bindsym $mod+Shift+r restart

    set $WS1 1
    set $WS2 2
    set $WS3 3
    set $WS4 4
    set $WS5 5
    set $WS6 6
    set $WS7 7
    set $WS8 8
    set $WS9 9
    set $WS10 10
    bindsym $mod+0 workspace $WS10
    bindsym $mod+1 workspace $WS1
    bindsym $mod+2 workspace $WS2
    bindsym $mod+3 workspace $WS3
    bindsym $mod+4 workspace $WS4
    bindsym $mod+5 workspace $WS5
    bindsym $mod+6 workspace $WS6
    bindsym $mod+7 workspace $WS7
    bindsym $mod+8 workspace $WS8
    bindsym $mod+9 workspace $WS9
    bindsym $mod+Shift+0 move container to workspace $WS10
    bindsym $mod+Shift+1 move container to workspace $WS1
    bindsym $mod+Shift+2 move container to workspace $WS2
    bindsym $mod+Shift+3 move container to workspace $WS3
    bindsym $mod+Shift+4 move container to workspace $WS4
    bindsym $mod+Shift+5 move container to workspace $WS5
    bindsym $mod+Shift+6 move container to workspace $WS6
    bindsym $mod+Shift+7 move container to workspace $WS7
    bindsym $mod+Shift+8 move container to workspace $WS8
    bindsym $mod+Shift+9 move container to workspace $WS9

    bindsym XF86AudioLowerVolume exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -d 5 && pkill -RTMIN+3 i3blocks
    bindsym XF86AudioRaiseVolume exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -i 5 && pkill -RTMIN+3 i3blocks
    bindsym XF86AudioMute exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -t && pkill -RTMIN+3 i3blocks

    mode "  " {
      bindsym Left   resize shrink width 10 px or 10 ppt
      bindsym Down   resize grow height 10 px or 10 ppt
      bindsym Up   resize shrink height 10 px or 10 ppt
      bindsym Right  resize grow width 10 px or 10 ppt
      bindsym Escape mode "default"
      bindsym Space mode "default"
    }
    bindsym $mod+r mode "  "

    #class                  container-border container-bg fg             indicator window-border
    client.focused          ${gray.dark}     ${black}     ${white}       ${white}  ${gray.medium}
    client.focused_inactive ${black}         ${black}     ${gray.medium} ${white}  ${black}
    client.unfocused        ${black}         ${black}     ${gray.medium} ${white}  ${black}
    client.urgent           ${red.light}     ${black}     ${white}       ${white}  ${red.light}
    client.placeholder      ${black}         ${black}     ${gray.medium} ${white}  ${black}

    bar {
      status_command "${pkgs.i3blocks}/bin/i3blocks -c ${pkgs.writeText "i3blocks.conf" i3blocks_conf}"
      position top

      font pango:${uiFont.name},FontAwesome ${toString uiFont.size}
      separator_symbol " // "
      colors {
        separator ${gray.medium}
        background ${black}
        statusline ${gray.medium}

        #                  border   bg       fg
        focused_workspace  ${black} ${black} ${white}
        active_workspace   ${black} ${black} ${gray.medium}
        inactive_workspace ${black} ${black} ${gray.medium}
        urgent_workspace   ${black} ${black} ${red.light}
        binding_mode       ${black} ${black} ${red.light}
      }
    }
'';
in {
  services.xserver = with import ../helpers.nix; with import ../theme.nix; {
    enable = true;
    layout = commaSep [ "de" "gr" "ru" ];
    xkbVariant = commaSep [ "T3" "polytonic" "phonetic_winkeys" ];
    xkbOptions = commaSep [ "terminate:ctrl_alt_bksp" "grp:alt_space_toggle" ];
    libinput.enable = true;
    xautolock = {
      enable = true;
      time = 15;
      locker = config.defaultApplications.locker;
      nowlocker = config.defaultApplications.locker;
      enableNotifier = true;
      notifier = ''${pkgs.libnotify}/bin/notify-send -u normal -a xautolock "Locking soon" "The screen will lock in 10 seconds."'';
    };
    displayManager.auto = { enable = true; user = "kfm"; };
    desktopManager.xterm.enable = false;
    desktopManager.wallpaper.mode = "fill";
    windowManager.default = "i3";
    windowManager.i3 = {
      enable = true;
      configFile = pkgs.writeText "i3.conf" i3_conf;
      extraPackages = [];
    };
  };

  i18n = {
    defaultLocale = "en_GB.UTF-8";
    consoleUseXkbConfig = true;
    consoleColors = with import ../theme.nix; map (c: lib.strings.removePrefix "#" c) colorPalette;
  };

  services.compton = {
    enable = true;
    shadow = true;
    menuOpacity = "0.9";
    shadowOpacity = "0.3";
  };

  services.illum.enable = true;
  services.unclutter.enable = true;
}