#!/usr/bin/env bash

THRESHOLD=15
EXPIRY_MS=120000 # 2 minutes

# Find the battery device (first one found)
BATTERY=$(upower -e | grep battery | head -n1)

# If no battery found, exit
if [ -z "$BATTERY" ]; then
    echo "$(date '+%Y-%m-%d %H:%M:%S') No battery found. Exiting."
    exit 0
fi

echo "$(date '+%Y-%m-%d %H:%M:%S') Battery device: $BATTERY"

# Get battery state and percentage
STATE=$(upower -i "$BATTERY" | awk '/state:/ {print $2}')
PERCENT=$(upower -i "$BATTERY" | awk -F'[:%]' '/percentage:/ {gsub(/ /,"",$2); print $2}')

echo "$(date '+%Y-%m-%d %H:%M:%S') Battery state: $STATE, percentage: $PERCENT"

# Only notify if discharging and below threshold
if [ "$STATE" = "discharging" ] && [ "$PERCENT" -lt "$THRESHOLD" ]; then
    notify-send -u critical -t "$EXPIRY_MS" "Battery low" "Battery at ${PERCENT}% and discharging."
    echo "$(date '+%Y-%m-%d %H:%M:%S') Notification sent: Battery at ${PERCENT}% and discharging."
fi