#!/bin/bash
# Battery indicator bar for waybar (JSON, class drives CSS blink animations).
# Usage:  battery.sh bar

# Find first power supply with type "Battery" (works for BAT0, BAT1, CMB0, etc.)
BAT=""
for PS in /sys/class/power_supply/*; do
    if [ -f "$PS/type" ] && [ "$(cat "$PS/type")" = "Battery" ]; then
        BAT="$PS"
        break
    fi
done

case "$1" in
bar)
    if [ -z "$BAT" ] || [ ! -f "$BAT/capacity" ]; then
        echo '{"text": " ", "class": "", "percentage": 100}'
        exit 0
    fi

    CAP=$(cat "$BAT/capacity")
    STATUS=$(cat "$BAT/status")

    CLASS=""
    case "$STATUS" in
        Charging)    CLASS="charging" ;;
        Full)        CLASS="full" ;;
        Discharging)
            if   [ "$CAP" -le 10 ]; then CLASS="critical"
            elif [ "$CAP" -le 25 ]; then CLASS="warning"
            else                          CLASS="discharging"
            fi
            ;;
    esac

    echo "{\"text\": \" \", \"class\": \"$CLASS\", \"percentage\": $CAP}"
    ;;
esac