use std::ffi::CString;

use cocoa::appkit::NSWindowCollectionBehavior;
use tauri::Manager;
use tauri_nspanel::{
  block::ConcreteBlock,
  cocoa::{
    appkit::{NSMainMenuWindowLevel, NSView, NSWindow},
    base::{id, nil},
    foundation::{NSPoint, NSRect},
  },
  objc::{class, msg_send, runtime::NO, sel, sel_impl},
  panel_delegate, ManagerExt, WebviewWindowExt,
};
use tauri_plugin_decorum::WebviewWindowExt as WebviewWindowExt2;

#[allow(non_upper_case_globals)]
const NSWindowStyleMaskNonActivatingPanel: i32 = 1 << 7;

pub fn swizzle_to_menubar_panel(app_handle: &tauri::AppHandle) {
  let panel_delegate = panel_delegate!(SpotlightPanelDelegate {
    window_did_resign_key
  });

  let window = app_handle.get_webview_window("panel").unwrap();
  window.make_transparent().unwrap();

  let panel = window.to_panel().unwrap();
  let handle = app_handle.clone();

  panel_delegate.set_listener(Box::new(move |delegate_name: String| {
    if delegate_name.as_str() == "window_did_resign_key" {
      let _ = handle.emit("menubar_panel_did_resign_key", ());
    }
  }));

  panel.set_level(NSMainMenuWindowLevel + 1);

  panel.set_style_mask(NSWindowStyleMaskNonActivatingPanel);

  panel.set_collection_behaviour(
    NSWindowCollectionBehavior::NSWindowCollectionBehaviorCanJoinAllSpaces
      | NSWindowCollectionBehavior::NSWindowCollectionBehaviorStationary
      | NSWindowCollectionBehavior::NSWindowCollectionBehaviorFullScreenAuxiliary,
  );

  panel.set_delegate(panel_delegate);
}

pub fn setup_menubar_panel_listeners(app_handle: &tauri::AppHandle) {
  fn hide_menubar_panel(app_handle: &tauri::AppHandle) {
    if check_menubar_frontmost() {
      return;
    }
    let panel = app_handle.get_webview_panel("panel").unwrap();
    panel.order_out(None);
  }

  let handle = app_handle.clone();

  app_handle.listen_any("menubar_panel_did_resign_key", move |_| {
    hide_menubar_panel(&handle);
  });

  let handle = app_handle.clone();

  let callback = Box::new(move || {
    hide_menubar_panel(&handle);
  });

  register_workspace_listener(
    "NSWorkspaceDidActivateApplicationNotification".into(),
    callback.clone(),
  );

  register_workspace_listener(
    "NSWorkspaceActiveSpaceDidChangeNotification".into(),
    callback,
  );
}

pub fn update_menubar_appearance(app_handle: &tauri::AppHandle) {
  let window = app_handle.get_window("panel").unwrap();
  set_corner_radius(&window, 13.0);
}

pub fn set_corner_radius(window: &tauri::Window, radius: f64) {
  let win: id = window.ns_window().unwrap() as _;

  unsafe {
    let view: id = win.contentView();
    view.wantsLayer();

    let layer: id = view.layer();
    let _: () = msg_send![layer, setCornerRadius: radius];
  }
}

pub fn position_menubar_panel(app_handle: &tauri::AppHandle, padding_top: f64) {
  let window = app_handle.get_webview_window("panel").unwrap();

  let monitor = monitor::get_monitor_with_cursor().unwrap();

  let scale_factor = monitor.scale_factor();

  let visible_area = monitor.visible_area();

  let monitor_pos = visible_area.position().to_logical::<f64>(scale_factor);

  let monitor_size = visible_area.size().to_logical::<f64>(scale_factor);

  let mouse_location: NSPoint = unsafe { msg_send![class!(NSEvent), mouseLocation] };

  let handle: id = window.ns_window().unwrap() as _;

  let mut win_frame: NSRect = unsafe { msg_send![handle, frame] };

  win_frame.origin.y = (monitor_pos.y + monitor_size.height) - win_frame.size.height;

  win_frame.origin.y -= padding_top;

  win_frame.origin.x = {
    let top_right = mouse_location.x + (win_frame.size.width / 2.0);

    let is_offscreen = top_right > monitor_pos.x + monitor_size.width;

    if !is_offscreen {
      mouse_location.x - (win_frame.size.width / 2.0)
    } else {
      let diff = top_right - (monitor_pos.x + monitor_size.width);

      mouse_location.x - (win_frame.size.width / 2.0) - diff
    }
  };

  let _: () = unsafe { msg_send![handle, setFrame: win_frame display: NO] };
}

fn register_workspace_listener(name: String, callback: Box<dyn Fn()>) {
  let workspace: id = unsafe { msg_send![class!(NSWorkspace), sharedWorkspace] };

  let notification_center: id = unsafe { msg_send![workspace, notificationCenter] };

  let block = ConcreteBlock::new(move |_notif: id| {
    callback();
  });

  let block = block.copy();

  let name: id =
    unsafe { msg_send![class!(NSString), stringWithCString: CString::new(name).unwrap()] };

  unsafe {
    let _: () = msg_send![
        notification_center,
        addObserverForName: name object: nil queue: nil usingBlock: block
    ];
  }
}

fn app_pid() -> i32 {
  let process_info: id = unsafe { msg_send![class!(NSProcessInfo), processInfo] };

  let pid: i32 = unsafe { msg_send![process_info, processIdentifier] };

  pid
}

fn get_frontmost_app_pid() -> i32 {
  let workspace: id = unsafe { msg_send![class!(NSWorkspace), sharedWorkspace] };
  let frontmost_application: id = unsafe { msg_send![workspace, frontmostApplication] };
  let pid: i32 = unsafe { msg_send![frontmost_application, processIdentifier] };

  pid
}

pub fn check_menubar_frontmost() -> bool {
  get_frontmost_app_pid() == app_pid()
}