{ config, pkgs, lib, ... }:

let
  vars = import ./variables.nix;

  # Battery notification script
  batteryNotify = pkgs.writeShellScriptBin "battery-notify" ''
    #!/bin/sh

    # Get battery status
    BATTERY_PATH="/sys/class/power_supply/BAT0"

    if [ ! -d "$BATTERY_PATH" ]; then
      # Try BAT1 if BAT0 doesn't exist
      BATTERY_PATH="/sys/class/power_supply/BAT1"
      if [ ! -d "$BATTERY_PATH" ]; then
        exit 0
      fi
    fi

    CAPACITY=$(cat "$BATTERY_PATH/capacity")
    STATUS=$(cat "$BATTERY_PATH/status")

    # Critical threshold (5%)
    if [ "$CAPACITY" -le 5 ] && [ "$STATUS" != "Charging" ]; then
      ${pkgs.libnotify}/bin/notify-send -u critical "Battery Critical" "Battery level: $CAPACITY%\nPlease plug in charger immediately!"
    # Low threshold (15%)
    elif [ "$CAPACITY" -le 15 ] && [ "$STATUS" != "Charging" ]; then
      ${pkgs.libnotify}/bin/notify-send -u normal "Battery Low" "Battery level: $CAPACITY%\nConsider plugging in charger soon."
    fi
  '';

in {
  home.packages = [ batteryNotify ];

  services.dunst = {
    enable = true;

    settings = lib.mkForce {
      global = {
        width = "(200,300)";
        height = "(0,150)";
        offset = "(30,50)";
        origin = "bottom-right";
        transparency = 10;
        frame_width = 2;
        corner_radius = 8;
        gap_size = 5;
      };

      urgency_low = {
        background = vars.colors.background;
        foreground = vars.colors.foreground;
        timeout = 8;
      };

      urgency_normal = {
        background = vars.colors.background;
        foreground = vars.colors.foreground;
        frame_color = vars.colors.accent;
        timeout = 10;
      };

      urgency_critical = {
        background = vars.colors.background;
        foreground = vars.colors.foreground;
        frame_color = vars.colors.alert;
        timeout = 0;  # Don't auto-dismiss critical notifications
      };
    };
  };

  # Systemd service to check battery periodically
  systemd.user.services.battery-notify = {
    Unit = {
      Description = "Battery level notification service";
    };

    Service = {
      Type = "oneshot";
      ExecStart = "${batteryNotify}/bin/battery-notify";
    };
  };

  # Timer to run battery check every 2 minutes
  systemd.user.timers.battery-notify = {
    Unit = {
      Description = "Battery level notification timer";
    };

    Timer = {
      OnBootSec = "1min";
      OnUnitActiveSec = "2min";
    };

    Install = {
      WantedBy = [ "timers.target" ];
    };
  };
}