#!/usr/bin/env bash

# The idea is to define "holder" modules in i3status config and then replace them

# In order to make this example work you need to add
# order += "tztime holder__headphones"
# and 
# tztime holder__headphones {
#        format = "holder__headphones"
# }

# Make sure jq is installed

update_holder() {
  local instance="$1"
  local replacement="$2"
  echo "$3" | jq --argjson arg_j "$replacement" "(.[] | (select(.instance==\"$instance\"))) |= \$arg_j"
}

remove_holder() {
  local instance="$1"
  echo "$2" | jq "del(.[] | (select(.instance==\"$instance\")))"
}

get_device_battery_status() {
  for uuid in $(bluetoothctl devices | cut -f2 -d' ')
  do
    local device_info="$(bluetoothctl info "$uuid")"

    if [ -n "$(echo $device_info | grep 'Connected: yes\|Battery Percentage')" ]; then
      echo "$device_info" | grep 'Battery Percentage' | awk -F '[()]' '{ print "🎧🔋"$2"%" }'
      break
    fi
  done
}

update_json_with_text() {
  local json="{ \"full_text\": \"$1\", \"color\": \"#FFFFFF\"}"
  update_holder holder__headphones "$json" "$2"
}

i3status | (read line; echo "$line"; read line ; echo "$line" ; read line ; echo "$line" ; while true
do
  read line
  json_array="$(echo $line | sed -e 's/^,//')"
  echo ",$(update_json_with_text "$(get_device_battery_status)" "$json_array")"
done)