#!/bin/sh

battery_level=$(acpi -b | sed -n 's/.*\ \([[:digit:]]\{1,3\}\)\%.*/\1/;p')
#battery_level=`acpi -b | cut -d ' ' -f 4 | grep -o '[0-9]*'`
battery_state=$(acpi -b | awk '{print $3}' | tr -d ",")
#battery_state=$(acpi | grep 'Battery' | sed 's/Battery\s[0-9]*: //' | sed 's/, [0-9][0-9]*\%.*//')
battery_remaining=$(acpi | grep -oh '[0-9:]* remaining' | sed 's/:\w\w remaining$/ Minutes/'  | sed 's/00://' | sed 's/:/h /')

backlight_cmd=$(which xbacklight)
backlight_arg=set
_battery_threshold_level="35"
_battery_critical_level="25"
_battery_action=hibernate
_battery_action_level="15"

if [ ! -f "/tmp/.battery" ]; then
    echo "${battery_level}" > /tmp/.battery
    echo "${battery_state}" >> /tmp/.battery
    exit
fi

previous_battery_level=$(cat /tmp/.battery | head -n 1)
previous_battery_state=$(cat /tmp/.battery | tail -n 1)
echo "${battery_level}" > /tmp/.battery
echo "${battery_state}" >> /tmp/.battery

checkBatteryLevel() {
    if [ "${battery_state}" != "Discharging" ] || [ "${battery_level}" == "${previous_battery_level}" ]; then
        if [ -f /tmp/.critbatlvl ] && [ "${battery_state}" == "Charging" ]; then
            notify-send.sh -s 99
            rm -f /tmp/.critbatlvl
        fi
        if [ ! -f /tmp/.fullbatlvl ] && [ "${battery_state}" == "Full" ]; then
            notify-send.sh "Full Battery" "Battery is fully charged!"$'\n'"Please unplug the charger." -i ~/.icons/full-battery.svg -u normal -r 43354 -R /tmp/.fullbatlvl
        fi
        exit
    fi
    if [ "${battery_state}" == "Charging" ] && [ ${battery_level} -lt 100 ]; then
        if [ ${battery_level} -le ${_battery_action_level} ]; then
            systemctl ${_battery_action}
        elif [ ${battery_level} -le ${_battery_critical_level} ]; then
            notify-send.sh "Critical Battery" "Your laptop will immediately enter '${_battery_action}' mode, plug the charger into a power outlet to cancel it!" -i ~/.icons/laptop-warning.svg -u critical -r 43352 -R /tmp/.critbatlvl
            ${backlight_cmd} -${backlight_arg} 5
        elif [ ${battery_level} -le ${_battery_threshold_level} ]; then
            notify-send.sh "Low Battery" "${battery_level}% (${battery_remaining}) of battery remaining." -i ~/.icons/low-battery.svg -u normal -r 43353
            ${backlight_cmd} -${backlight_arg} 25
        fi
        if [ -f /tmp/.fullbatlvl ]; then rm -f /tmp/.fullbatlvl; fi
    fi
}

checkBatteryStateChange() {
    if [ "$battery_state" != "Discharging" ] && [ "$previous_battery_state" == "Discharging" ]; then
        notify-send "Charging" "Your laptop is connected to a power source." -i ~/.icons/power-charging.svg -u low
        ${backlight_cmd} -${backlight_arg} 100
    fi

    if [ "$battery_state" == "Discharging" ] && [ "$previous_battery_state" != "Discharging" ]; then
        notify-send "Discharging" "Your laptop has been disconnected from power source." -i ~/.icons/power-unplugged.svg -u low
    fi
}

# INit
checkBatteryStateChange
checkBatteryLevel