#!/bin/bash

# Constants (access to display)
export DISPLAY=:0
export DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus"

# Find out which battery is the laptop's battery
BATTERY=$(acpi | grep -vwE "(unavailable)" | grep -o '[0-9]' | head -n 1)

# Daemon Constants
WARNING_PERCENT=35
FULL_PERCENT=98
BAT_PERCENT=$(acpi -b | grep "Battery $BATTERY" | head -n 1 | grep -P -o "[0-9]+(?=%)")
DISCHARGING_COUNT=$(acpi -b | grep "Battery $BATTERY" | grep -c "Discharging")
NOTCHARGING_COUNT=$(acpi -b | grep "Battery $BATTERY" | grep "until" | grep -c "Not Charging")
## Conditioning Files
LOW_BAT_FILE=/tmp/battery_low
FULL_BAT_FILE=/tmp/battery_full

# Functions
battery-full() {
	notify-send "Battery Full" "Battery is fully charged!" -i "battery-full-charged" -r 9991 -t 5000
	touch $FULL_BAT_FILE
	rm -rf $LOW_BAT_FILE
}

battery-low() {
	notify-send "Low Battery" "${BAT_PERCENT}% of battery remaining." -u critical -i "battery-caution" -r 9991 -t 5000
	touch $LOW_BAT_FILE
	rm -rf $FULL_BAT_FILE
}

battery-normal() {
	if [ "$1" == "Normal" ]; then
		rm $FULL_BAT_FILE

	elif [ "$1" == "Charging" ]; then
		rm $LOW_BAT_FILE
	fi
}

# IF the batttery is discharging AND there is a FULL_BAT_FILE exists AND battery is less than 99%
if [ "$BAT_PERCENT" -lt $FULL_PERCENT ] && [ "$DISCHARGING_COUNT" -eq 1 ] && [ -f $FULL_BAT_FILE ]; then
	#echo "hit normal + full file exists + less than full %"
	battery-normal "Normal"

# If charging, AND less than full percentage AND LOW_BAT_FILE exists:
elif [ "$BAT_PERCENT" -lt $FULL_PERCENT ] && [ "$DISCHARGING_COUNT" -eq 0 ] && [ -f "$EMPTY_BAT_FILE" ]; then
	#echo "hit normal + warning file exists + more than warning %"
	battery-normal "Charging"
fi

# IF the battery is charging AND is full (+ hasn't show any notif yet):
if [ "$BAT_PERCENT" -ge $FULL_PERCENT ] && [ ! -f $FULL_BAT_FILE ] && [ "$DISCHARGING_COUNT" = 0 ]; then
	#echo "hit full + charging"
	battery-full

# Another condition, battery could be full, yet it won't be charging:
elif [ "$BAT_PERCENT" -ge $FULL_PERCENT ] && [ "$NOTCHARGING_COUNT" = 1 ] && [ ! -f $LOW_BAT_FILE ]; then
	#echo "hit full + not charging"
	battery-full

# IF the battery is low and it's discharging (+ hasn't shown any notif yet):
elif [ "$BAT_PERCENT" -le $WARNING_PERCENT ] && [ "$DISCHARGING_COUNT" -eq 1 ] && [ ! -f $LOW_BAT_FILE ]; then
	#echo "hit low + discharging"
	battery-low

# If LOW_BAT_FILE Exists, Spam Until It's Charging
elif [ "$BAT_PERCENT" -le $WARNING_PERCENT ] && [ "$DISCHARGING_COUNT" -eq 1 ] && [ -f $LOW_BAT_FILE ]; then
	notify-send "Low Battery" "${BAT_PERCENT}% of battery remaining." -u critical -i "battery-caution" -r 9991 -t 5000
fi

# Debug commands
#echo "$BAT_PERCENT is the battery percent"
#echo "$DISCHARGING_COUNT  --  1 = discharging, 0 = charging"