{pkgs, ...}: let
  # 1. The Brain: Logic to find a window or launch a new one
  hakase-launch-or-focus = pkgs.writeShellScriptBin "hakase-launch-or-focus" ''
    if (($# == 0)); then
      echo "Usage: hakase-launch-or-focus [window-pattern] [launch-command]"
      exit 1
    fi

    WINDOW_PATTERN="$1"
    # Escaped Nix interpolation for shell default value logic
    LAUNCH_COMMAND="''${2:-"uwsm-app -- $WINDOW_PATTERN"}"

    # Locate window address via hyprctl and jq
    WINDOW_ADDRESS=$(${pkgs.hyprland}/bin/hyprctl clients -j | ${pkgs.jq}/bin/jq -r --arg p "$WINDOW_PATTERN" \
      '.[] | select((.class | test("\\b" + $p + "\\b"; "i")) or (.title | test("\\b" + $p + "\\b"; "i"))) | .address' | head -n1)

    if [[ -n $WINDOW_ADDRESS ]]; then
      # If found, focus the existing window
      ${pkgs.hyprland}/bin/hyprctl dispatch focuswindow "address:$WINDOW_ADDRESS"
    else
      # If not found, execute the launch command
      eval exec setsid $LAUNCH_COMMAND
    fi
  '';

  hakase-launch-tui = pkgs.writeShellScriptBin "hakase-launch-tui" ''
    APP_NAME=$(basename "$1")
    # Using org.hakase prefix so the focus script can find it via class name
    exec setsid uwsm-app -- xdg-terminal-exec --app-id=org.hakase."$APP_NAME" -e "$@"
  '';

  hakase-focus-wrapper = pkgs.writeShellScriptBin "hakase-focus-wrapper" ''
    APP_NAME=$(basename "$1")
    WINDOW_PATTERN="org.hakase.$APP_NAME"
    LAUNCH_CMD="hakase-launch-tui $*"

    exec hakase-launch-or-focus "$WINDOW_PATTERN" "$LAUNCH_CMD"
  '';

  hakase-launch-wifi = pkgs.writeShellScriptBin "hakase-launch-wifi" ''
    # Unblock the WiFi radio (requires appropriate user groups/permissions)
    # ${pkgs.util-linux}/bin/rfkill unblock wifi

    # Use the focus wrapper to launch or switch to Impala
    exec hakase-focus-wrapper impala
  '';

  hakase-launch-bluetooth =
    pkgs.writeShellScriptBin "hakase-launch-bluetooth"
    ''
      # ${pkgs.util-linux}/bin/rfkill unblock wifi
        exec hakase-focus-wrapper bluetui

    '';
  hakase-launch-popup = pkgs.writeShellScriptBin "hakase-launch-popup" ''
    if (($# < 3)); then
      echo "Usage: hakase-launch-popup [width] [height] [command...]"
      exit 1
    fi

    # --- ARGS & CONFIG ---
    WIN_WIDTH="$1"
    WIN_HEIGHT="$2"
    shift 2

    MARGIN=10
    BAR_HEIGHT=40
    # ---------------------

    CMD_NAME=$(basename "$1")
    TARGET_CLASS="org.hakase.popup.$CMD_NAME"

    # 1. SINGLETON LOGIC: Check for ANY existing hakase popup
    # We look for any client with a class starting with "org.hakase.popup."
    EXISTING_JSON=$(${pkgs.hyprland}/bin/hyprctl clients -j | ${pkgs.jq}/bin/jq -r '.[] | select(.class | startswith("org.hakase.popup."))')

    if [[ -n "$EXISTING_JSON" ]]; then
      OLD_ADDR=$(echo "$EXISTING_JSON" | ${pkgs.jq}/bin/jq -r '.address')
      OLD_CLASS=$(echo "$EXISTING_JSON" | ${pkgs.jq}/bin/jq -r '.class')

      # Close the existing popup
      ${pkgs.hyprland}/bin/hyprctl dispatch closewindow "address:$OLD_ADDR"

      # If the existing popup was the SAME one we are trying to launch, we are done (Toggle Off behavior)
      if [[ "$OLD_CLASS" == "$TARGET_CLASS" ]]; then
        exit 0
      fi

      # If it was a different popup, wait a tiny bit for Hyprland to process the close
      # This prevents the new window from "merging" with the closing animation of the old one
      sleep 0.15
    fi

    # 2. Calculate Geometry (Standard logic)
    MONITOR_INFO=$(${pkgs.hyprland}/bin/hyprctl monitors -j | ${pkgs.jq}/bin/jq '.[] | select(.focused == true)')
    MON_X=$(echo "$MONITOR_INFO" | ${pkgs.jq}/bin/jq '.x')
    MON_Y=$(echo "$MONITOR_INFO" | ${pkgs.jq}/bin/jq '.y')
    MON_WIDTH=$(echo "$MONITOR_INFO" | ${pkgs.jq}/bin/jq '.width')

    TARGET_X=$((MON_X + MON_WIDTH - WIN_WIDTH - MARGIN))
    TARGET_Y=$((MON_Y + BAR_HEIGHT + MARGIN))

    # 3. Launch with Rules
    RULE="[float;pin;size $WIN_WIDTH $WIN_HEIGHT;move $TARGET_X $TARGET_Y]"
    ${pkgs.hyprland}/bin/hyprctl dispatch exec "$RULE xdg-terminal-exec --app-id=$TARGET_CLASS -e $@"

    # 4. Background Listener (Close on Blur)
    (
      TIMEOUT=0
      WINDOW_ADDR=""
      while [[ -z "$WINDOW_ADDR" && $TIMEOUT -lt 20 ]]; do
        sleep 0.1
        WINDOW_ADDR=$(${pkgs.hyprland}/bin/hyprctl clients -j | ${pkgs.jq}/bin/jq -r --arg c "$TARGET_CLASS" '.[] | select(.class == $c) | .address')
        ((TIMEOUT++))
      done

      if [[ -n "$WINDOW_ADDR" ]]; then
        ${pkgs.socat}/bin/socat -U - UNIX-CONNECT:"$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock" | while read -r line; do
          if [[ "$line" == "activewindow>>"* ]]; then
            NEW_FOCUS="0x$(echo "$line" | cut -d '>' -f3 | cut -d ',' -f1)"
            # If focus is lost to another window, close this popup
            if [[ "$WINDOW_ADDR" != "$NEW_FOCUS" ]]; then
               ${pkgs.hyprland}/bin/hyprctl dispatch closewindow "address:$WINDOW_ADDR"
               break
            fi
          fi
        done
      fi
    ) &

    exit 0
  '';

  # 1. WiFi (Impala) - Requires a larger view
  hakase-popup-wifi = pkgs.writeShellScriptBin "hakase-popup-wifi" ''
    exec hakase-launch-popup 800 500 impala
  '';

  # 2. Bluetooth (Bluetui) - Fits your specific test size
  hakase-popup-bluetooth = pkgs.writeShellScriptBin "hakase-popup-bluetooth" ''
    exec hakase-launch-popup 600 500 bluetui
  '';

  # 3. Volume (Wiremix) - Can be smaller
  hakase-popup-volume = pkgs.writeShellScriptBin "hakase-popup-volume" ''
    exec hakase-launch-popup 800 300 wiremix
  '';
in {
  environment.systemPackages = [
    pkgs.jq
    pkgs.socat # Required for the socket listener
    pkgs.util-linux
    pkgs.bluetui
    pkgs.impala
    pkgs.wiremix
    pkgs.pamixer

    hakase-launch-popup
    hakase-popup-wifi
    hakase-popup-bluetooth
    hakase-popup-volume

    hakase-launch-or-focus
    hakase-launch-tui
    hakase-focus-wrapper
    hakase-launch-wifi
    hakase-launch-bluetooth
  ];
}