Bluetooth headset - switch between quality sound + no mic (A2DP) and crappy sound and mic (HSP/HFP)

bt-profile-switch.sh

#!/bin/bash 

CARD=$(pactl list | grep bluez_card | awk '{print $NF}')
BLUETOOTH_DEVICE=$(pacmd list-sinks | grep -o '<bluez_sink[^>]*' | cut -d\< -f2)

PROFILE_A2DP="a2dp_sink"
PROFILE_HEADSET_UNIT="headset_head_unit"

if [ "${1}" == "" -o "${1}" == "toggle" ] ; then
  if $(pacmd list-sinks | grep -o "<bluez_sink\..*\.$PROFILE_A2DP>" &> /dev/null) ; then
    echo "$PROFILE_A2DP->$PROFILE_HEADSET_UNIT"
    ${0} speak;
  else
    echo "$PROFILE_HEADSET_UNIT->$PROFILE_A2DP"
    ${0} listen;
  fi
fi

if [ "${1}" == "listen" ] ; then
    pactl set-card-profile "$CARD" "$PROFILE_A2DP" || echo "Problem setting profile"; exit 3
    pacmd set-default-sink "$BLUETOOTH_DEVICE" || echo "Problem setting default sink"; exit 4 
  exit;
fi;

if [ "${1}" == "speak" ] ; then
    pactl set-card-profile "$CARD" "$PROFILE_HEADSET_UNIT" || echo "Problem setting profile"; exit 3
    pacmd set-default-sink "$BLUETOOTH_DEVICE" || echo "Problem setting default sink"; exit 4 
fi;

#### Usage:

# Associate this script with a convenient hotkey in your system running, it will automatically toggle between A2DP and HSP bluetooth profile

####  Resources:

##  Why this is needed
# https://jimshaver.net/2015/03/31/going-a2dp-only-on-linux/

##  My original question
# https://askubuntu.com/questions/1004712/audio-profile-changes-automatically-to-hsp-bad-quality-when-i-change-input-to/1009156#1009156

##  Script to monitor plugged earphones and switch when unplugged (Ubuntu does that, but nice script):
# https://github.com/freundTech/linux-helper-scripts/blob/master/padevswitch/padevswitch

## Linux Mint Forum script

# https://forums.linuxmint.com/viewtopic.php?t=295859

works great for me. The only this I had to change is headset_head_unit to handsfree_head_unit.