#!/bin/bash

notify_headset() {
  beep
  dunstify \
    -i bluetooth-active-symbolic.symbolic \
    -t 5000 \
    -h string:synchronous:volume \
    -r 1000 \
    "Headset mode enabled"
}

notify_high_fidelity() {
  beep
  dunstify \
    -i bluetooth-active-symbolic.symbolic \
    -t 5000 \
    -h string:synchronous:volume \
    -r 1000 \
    "High fidelity mode enabled"
}

beep() {
  pw-play /usr/share/sounds/freedesktop/stereo/audio-volume-change.oga
}

case "$(myhostname)" in
  maggie|bart)
    card=bluez_card.50_C2_75_69_8E_5E
    ;;
  *)
    echo "This machine doesn't understand headset toggling." >&2
    exit 1
    ;;
esac

if ! [[ $(pactl get-default-sink) = *bluez* ]]; then
  exit 0
fi
cur="$(
  pactl list cards \
    | rg -U '^\s+Name: bluez_card\p{any}+?Active Profile: (\S+)' -or '$1'
)"
case "$cur" in
  a2dp-sink)
    pactl set-card-profile $card headset-head-unit-msbc
    notify_headset
    ;;
  headset-head-unit|headset-head-unit-msbc)
    pactl set-card-profile $card a2dp-sink
    notify_high_fidelity
    ;;
  *)
    echo "Unrecognized bluetooth card profile: $cur" >&2
    exit 1
    ;;
esac