#!/bin/bash
# desktop-assistant tool: bluetooth status (read-only).
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# bluetooth.sh: whether bluetooth is on, the connected devices with their
# kind (BlueZ icon name) and battery when the device reports one, and the
# paired devices that are not connected. Only show, devices and info run
# here: nothing connects, pairs or scans.

set -uo pipefail

power=$(bluetoothctl show | sed -n 's/^\tPowered: //p')
[ -n "$power" ] || { echo "no bluetooth controller" >&2; exit 1; }
[ "$power" = yes ] || { echo "bluetooth is off"; exit 0; }
echo "bluetooth on"

connected=0
others=()
while read -r _ mac _; do
    info=$(bluetoothctl info "$mac")
    alias=$(sed -n 's/^\tAlias: //p' <<<"$info")
    if grep -q $'^\tConnected: yes' <<<"$info"; then
        kind=$(sed -n 's/^\tIcon: //p' <<<"$info")
        battery=$(sed -n 's/^\tBattery Percentage: .*(\([0-9]*\))$/\1/p' <<<"$info")
        echo "connected: $alias (${kind:-unknown kind}${battery:+, battery $battery%})"
        connected=$((connected + 1))
    else
        others+=("$alias")
    fi
done < <(bluetoothctl devices Paired)

[ "$connected" -gt 0 ] || echo "no device connected"
[ "${#others[@]}" -eq 0 ] || { printf 'paired, not connected: '; (IFS=,; echo "${others[*]}" | sed 's/,/, /g'); }