#!/usr/bin/env bash

# Graphics card
CARD=`ls /sys/class/backlight | head -n 1`

# Get brightness
get_backlight() {
	if [[ "$CARD" == *"intel_"* ]]; then
		BNESS=`xbacklight -get`
		LIGHT=${BNESS%.*}
	else
		LIGHT=$(printf "%.0f\n" `light -G`)
	fi
	echo "${LIGHT}%"
}

# Get icons
get_icon() {
	backlight="$(get_backlight)"
	current="${backlight%%%}"
	if [[ ("$current" -ge "0") && ("$current" -le "20") ]]; then
		icon='/usr/share/icons/dunst/brightness-20.png'
	elif [[ ("$current" -ge "20") && ("$current" -le "40") ]]; then
		icon='/usr/share/icons/dunst/brightness-40.png'
	elif [[ ("$current" -ge "40") && ("$current" -le "60") ]]; then
		icon='/usr/share/icons/dunst/brightness-60.png'
	elif [[ ("$current" -ge "60") && ("$current" -le "80") ]]; then
		icon='/usr/share/icons/dunst/brightness-80.png'
	elif [[ ("$current" -ge "80") && ("$current" -le "100") ]]; then
		icon='/usr/share/icons/dunst/brightness-100.png'
	fi
}

# Increase brightness
inc_backlight() {
	if [[ "$CARD" == *"intel_"* ]]; then
		xbacklight -inc 10 && get_icon && dunstify -u low --replace=69 -i "$icon" "Brightness : $(get_backlight)"
	else
		light -A 5 && get_icon && dunstify -u low --replace=69 -i "$icon" "Brightness : $(get_backlight)"
	fi
}

# Decrease brightness
dec_backlight() {
	if [[ "$CARD" == *"intel_"* ]]; then
		xbacklight -dec 10 && get_icon && dunstify -u low --replace=69 -i "$icon" "Brightness : $(get_backlight)"
	else
		light -U 5 && get_icon && dunstify -u low --replace=69 -i "$icon" "Brightness : $(get_backlight)"
	fi
}

# Execute accordingly
if [[ "$1" == "--get" ]]; then
	get_backlight
elif [[ "$1" == "--inc" ]]; then
	inc_backlight
elif [[ "$1" == "--dec" ]]; then
	dec_backlight
else
	get_backlight
fi