helm/modules/media/spotify.nix

# I use spotify for my music needs. Gone are the days where I'd manage 200gb+ of
# local music; most of which I haven't heard or don't even like.

{ config, options, lib, pkgs, ... }:
with lib;
{
  options.modules.media.spotify = {
    enable = mkOption {
      type = types.bool;
      default = false;
    };
  };

  config = mkIf config.modules.media.spotify.enable {
    my.packages = with pkgs; [
      # services.spotifyd doesn't work so we'll have to roll our own spotifyd +
      # spotify-tui solution. The dbus interface doesn't work, though, so we
      # have to wait for spotify-tui to implement CLI command for controlling
      # spotify playback. See
      # https://github.com/Rigellute/spotify-tui/issues/147 or for spotifyd to
      # get fixed.
      unstable.spotifyd
      (writeScriptBin "spt" ''
        #!${stdenv.shell}
        if ! systemctl --user is-active spotifyd >/dev/null; then
          systemctl --user start spotifyd
        fi
        echo $TMUX >/tmp/spt.tmux
        exec ${unstable.spotify-tui}/bin/spt
      '')

      # spotify-tui is fine for selecting and playing music, but incomplete. We
      # still occasionally need the official client for more sophisticated
      # search and the "made for you" playlists.
      spotify

      # Since dbus doesn't work with Nix's spotifyd/spotify-tui, and I always
      # use tmux for my terminal, may as well exploit tmux to control spotify.
      playerctl
      (writeScriptBin "spt-send" ''
         #!${stdenv.shell}
         dbus_cmd='playerctl -p spotify'
         tmux_cmd="tmux send-keys -t $(cat /tmp/spt.tmux | cut -d, -f3)"
         case "$1" in
           toggle) $dbus_cmd play-pause 2>/dev/null || $tmux_cmd " " ;;
           next) $dbus_cmd next 2>/dev/null       || $tmux_cmd n ;;
           prev) $dbus_cmd previous 2>/dev/null   || $tmux_cmd p ;;
         esac
       '')

      (writeScriptBin "spt-send-notify" ''
         #!${stdenv.shell}
         client_id=$(pass www/spotify.com | grep -E '^client_id:' | awk '{print $2}')
         client_secretd=$(pass www/spotify.com | grep -E '^client_secret:' | awk '{print $2}')
         jq="${pkgs.jq}/bin/jq"

         token=$(curl -s -X 'POST' -u $client_id:$client_secretd -d grant_type=client_credentials https://accounts.spotify.com/api/token | $jq '.access_token' | cut -d\" -f2)
         result=$?
         if [[ $result != 0 ]]; then
           notify-send "spt-send failure" "Could not acquire token"
           exit 1
         fi
         case "$PLAYER_EVENT" in
             start)
                 curl -s -X 'GET' https://api.spotify.com/v1/tracks/$TRACK_ID -H 'Accept: application/json' -H 'Content-Type: application/json' -H "Authorization:\"Bearer $token\"" | $jq '.name, .artists[].name, .album.name, .album.release_date, .track_number, .album.total_tracks' | xargs printf "\"Playing '%s' from '%s' (album: '%s' in %s (%s/%s))\"" | xargs notify-send --urgency=low --expire-time=3000 --icon=/usr/share/icons/gnome/32x32/actions/player_play.png --app-name=spotifyd spotifyd
                 ;;
             stop)
                 curl -s -X 'GET' https://api.spotify.com/v1/tracks/$TRACK_ID -H 'Accept: application/json' -H 'Content-Type: application/json' -H "Authorization:\"Bearer $token\"" | $jq '.name, .artists[].name, .album.name, .album.release_date, .track_number, .album.total_tracks' | xargs printf "Stoping music (Last song: '%s' from '%s' (album: '%s' in %s (%s/%s)))\"" | xargs notify-send --urgency=low --expire-time=3000 --icon=/usr/share/icons/gnome/32x32/actions/player_stop.png --app-name=spotifyd spotifyd
                 ;;
             change)
                 curl -s -X 'GET' https://api.spotify.com/v1/tracks/$TRACK_ID -H 'Accept: application/json' -H 'Content-Type: application/json' -H "Authorization:\"Bearer $token\"" | $jq '.name, .artists[].name, .album.name, .album.release_date, .track_number, .album.total_tracks' | xargs printf "\"Music changed to '%s' from '%s' (album: '%s' in %s (%s/%s))\"" | xargs notify-send --urgency=low --expire-time=3000 --icon=/usr/share/icons/gnome/32x32/actions/player_fwd.png --app-name=spotifyd spotifyd
                 ;;
             *)  2>&1 echo "Unkown event."
                 exit 2
                 ;;
         esac
      '')
    ];

    systemd.user.services.spotifyd.serviceConfig =
      let spotifydConf = pkgs.writeText "spotifyd.conf" ''
          [global]
          username = g2qwjcs6334oacg1zg9wrihnn
          password_cmd = ${pkgs.pass}/bin/pass www/spotify.com | head -n1
          backend = pulseaudio
          on_song_change_hook = spt-send-notify
          cache_path = /home/${config.my.username}/.cache/spotifyd
        '';
      in {
        ExecStart = ''
          ${pkgs.unstable.spotifyd}/bin/spotifyd --no-daemon \
                                                 --cache-path /tmp/spotifyd \
                                                 --config-path ${spotifydConf}
        '';
        Restart = "always";
        RestartSec = 6;
      };
  };
}