#!/bin/sh

# 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"
# }

[ -x "/usr/bin/jq" ] || exec i3status

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

get_device_battery_status() {
    for uuid in $(timeout 1 bluetoothctl devices | cut -f2 -d' ' 2>/dev/null)
    do
        device_info="$(timeout 1 bluetoothctl info "${uuid}")"

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

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

i3status | (
    # read first 2 lines without formatting
    read -r line
    echo "${line}"
    read -r line
    echo "${line}"

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