#!/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"
# }

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

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

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