#!/bin/bash
# Copyright (C) 2014 Julien Bonjean <julien@bonjean.info>
# Copyright (C) 2014 Alexander Keller <github@nycroth.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#------------------------------------------------------------------------

# The second parameter overrides the mixer selection
# For PulseAudio users, use "pulse"
# For Jack/Jack2 users, use "jackplug"
# For ALSA users, you may use "default" for your primary card
# or you may use hw:# where # is the number of the card desired
MIXER="default"
[ -n "$(lsmod | grep pulse)" ] && MIXER="pulse"
[ -n "$(lsmod | grep jack)" ] && MIXER="jackplug"
MIXER="${2:-$MIXER}"

# The instance option sets the control to report and configure
# This defaults to the first control of your selected mixer
# For a list of the available, use `amixer -D $Your_Mixer scontrols`
SCONTROL="${BLOCK_INSTANCE:-$(amixer -D $MIXER scontrols |
                  sed -n "s/Simple mixer control '\([A-Za-z ]*\)',0/\1/p" |
                  head -n1
                )}"

# The first parameter sets the step to change the volume by (and units to display)
# This may be in in % or dB (eg. 5% or 3dB)
STEP="${1:-2%}"


#------------------------------------------------------------------------

capability() { # Return "Capture" if the device is a capture device
    amixer -D $MIXER get $SCONTROL |
        sed -n "s/  Capabilities:.*cvolume.*/Capture/p"
}

volume() {
    amixer -D $MIXER get $SCONTROL $(capability)
}

format() {
    perl_filter='if (/.*\[(\d+)%\] (\[(-?\d+.\d+)dB\] )?\[(on|off)\]/)'
    perl_filter+='{CORE::say $4 eq "off" ? "-1" : "'
    perl_filter+=$([[ $STEP = *dB ]] && echo '$3' || echo '$1')
    perl_filter+='"; exit}'
    perl -ne "$perl_filter"
}

#------------------------------------------------------------------------

case $BLOCK_BUTTON in
  1) pavucontrol &>/dev/null &;;
  2) ~/.config/i3/cycleaudio.py;;
  3) amixer -q -D $MIXER sset $SCONTROL $(capability) toggle ;;  # right click, mute/unmute
  4) amixer -q -D $MIXER sset $SCONTROL $(capability) ${STEP}+ unmute ;; # scroll up, increase
  5) amixer -q -D $MIXER sset $SCONTROL $(capability) ${STEP}- unmute ;; # scroll down, decrease
esac

#------------------------------------------------------------------------

VOL=$(volume | format)

ACTIVE=$(pacmd list-sinks | grep '* index' | awk -F": " '{print $2}')

if pactl list short sinks | grep -q \^$ACTIVE".*Yeti"; then
    printf ""
elif pactl list short sinks | grep -q \^$ACTIVE".*bluez"; then
    printf " "
elif [ "$VOL" -eq -1 ]; then
    printf "X"
    exit 0
elif [ "$VOL" -eq 0 ]; then
    printf ""
elif [ "$VOL" -gt 59 ]; then
    printf ""
else
    printf ""
fi

printf " $VOL"
