{ pkgs, ... }:

let
  notify-system = pkgs.writeShellScriptBin "notify-system" ''
    function minute() {
      while true;do
        battery-plugged &
        battery-level &
        sleep 60
      done
    }

    minute
  '';

  battery-plugged = pkgs.writeShellScriptBin "battery-plugged" ''
    BATTERY_STATUS=$(cat /sys/class/power_supply/BAT*/status | head -n1)
    OLD_BATTERY_STATUS=$(cat /tmp/old_battery_status 2>/dev/null || echo "Unknown")
    if [[ $BATTERY_STATUS != $OLD_BATTERY_STATUS && $OLD_BATTERY_STATUS != "Unknown" ]]; then
      if [[ $BATTERY_STATUS == "Discharging" ]]; then
        ${pkgs.libnotify}/bin/notify-send "󰚦  " "Battery is unplugged"
      else
        ${pkgs.libnotify}/bin/notify-send "󰚥  " "Battery is plugged in"
      fi
    fi
    echo $BATTERY_STATUS > /tmp/old_battery_status
  '';

  battery-level = pkgs.writeShellScriptBin "battery-level" ''
    BATTERY_LEVEL=$(cat /sys/class/power_supply/BAT*/capacity | head -n1)
    BATTERY_STATUS=$(cat /sys/class/power_supply/BAT*/status | head -n1)
    if [[ $BATTERY_LEVEL -le 20 ]] && [[ $BATTERY_STATUS == "Discharging" ]]; then
      ${pkgs.libnotify}/bin/notify-send "󰁻  Low battery" "Battery level is $BATTERY_LEVEL%"
    elif [[ $BATTERY_LEVEL -le 10 ]] && [[ $BATTERY_STATUS == "Discharging" ]]; then
      ${pkgs.libnotify}/bin/notify-send --urgency=critical "󰁺  Very low battery" "Battery level is $BATTERY_LEVEL%"
    elif [[ $BATTERY_LEVEL -eq 100 ]] && [[ $BATTERY_STATUS -ne "Discharging" ]]; then
      ${pkgs.libnotify}/bin/notify-send "󰁹  Fully charged"
    fi
  '';

in { home.packages = [ notify-system battery-plugged battery-level ]; }