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#!/bin/bash

#SOURCE:https://gist.github.com/pcworld/3198763

    # spotify-automute-simple
    # - automatically mute Spotify when ad comes on and loop short track
    # - automatically switch back to Spotify when ad over


    # Settings

    PLAYER="mpv --loop=inf"
    LOOPTRACK="$HOME/.spotify-ad-track/spotify-ad-track.mp3"

    # VAR

    WMTITLE="Spotify Hacked for Linux "
    ADMUTE=0
    PAUSED=0

    # FCT

    get_pactl_nr(){
        pactl list | grep -E '(^Sink Input)|(media.name = \"Spotify\"$)' | cut -d \# -f2 \
        | grep -v Spotify
    }

    # MAIN

    xprop -spy -name "$WMTITLE" WM_ICON_NAME |
    while read -r XPROPOUTPUT; do
        XPROP_TRACKDATA="$(echo "$XPROPOUTPUT" | cut -d \" -f 2 )"
        DBUS_TRACKDATA="$(dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify / \
        org.freedesktop.MediaPlayer2.GetMetadata | grep xesam:title -A 1 | grep variant | cut -d \" -f 2)"

        echo "XPROP:    $XPROP_TRACKDATA"
        echo "DBUS:     $DBUS_TRACKDATA"

        if [[ "$XPROP_TRACKDATA" = "Spotify" ]]
          then
              echo "--PAUSED--"
              PAUSED="1"
          else
              PAUSED=0
              echo "--NOTPAUSED--"
        fi

        if [[ "$PAUSED" = "1" || "$XPROP_TRACKDATA" =~ "$DBUS_TRACKDATA" ]]
          then
              echo "--NOAD--"
              if [[ "$ADMUTE" = "1" ]]
                then
                    sleep 0.5
                    kill -s TERM "$ALTPID"
                    for PACTLNR in $(get_pactl_nr); do
                        pactl set-sink-input-mute "$PACTLNR" no > /dev/null 2>&1
                        echo "Unmuting sink $PACTLNR"
                    done
              fi
              ADMUTE=0
          else
              echo "--AD--"
              if [[ "$ADMUTE" != "1" ]]
                then
                    for PACTLNR in $(get_pactl_nr); do
                        pactl set-sink-input-mute "$PACTLNR" yes > /dev/null 2>&1
                        echo "Muting sink $PACTLNR"
                    done
                    $PLAYER "$LOOPTRACK" > /dev/null 2>&1 &
                    ALTPID="$!"
              fi
              ADMUTE=1
        fi
    done

    echo "Spotify not active. Exiting."
    exit 0