#!/usr/bin/env bash

# Background loop to monitor battery status and trigger dunstify on low power.
while true; do
    if [ ! -d /sys/class/power_supply/BAT0 ]; then
        sleep 60
        continue
    fi

    STATUS=$(cat /sys/class/power_supply/BAT0/status 2>/dev/null)
    # Using the native kernel capacity file instead of relying on ibam
    CAPACITY=$(cat /sys/class/power_supply/BAT0/capacity 2>/dev/null)

    if [ -z "$CAPACITY" ]; then
        sleep 60
        continue
    fi

    # Trigger notification at 5% or below
    if [ "$STATUS" == "Discharging" ] && [ "$CAPACITY" -le 5 ]; then
        if [ ! -f "/run/user/${UID}/battery_low" ]; then
            logger "Low power! Triggering notification...."
            # -p returns the ID so we can close it later
            NOTIF_ID=$(dunstify --urgency=critical \
                     -p \
                     --icon=/usr/share/icons/breeze-dark/emblems/16/emblem-warning.svg \
                     "LOW BATTERY!" \
                     "Battery level is at ${CAPACITY}%, plug power quick!")
            echo "$NOTIF_ID" > "/run/user/${UID}/battery_low"
        fi
    
    # Clear the notification if we plug back in and rise above 5%
    elif [ "$STATUS" == "Charging" ] && [ "$CAPACITY" -gt 5 ]; then
        if [ -f "/run/user/${UID}/battery_low" ]; then
            logger "Power reconnected and above 5 percent, clearing notification state."
            
            NOTIF_ID=$(cat "/run/user/${UID}/battery_low")
            if [ -n "$NOTIF_ID" ]; then
                dunstify --close=$NOTIF_ID
            fi
            
            rm -f "/run/user/${UID}/battery_low"
        fi
    fi

    sleep 60
done