use std::{
	cell::{Ref, RefCell, RefMut},
	ffi::c_void,
	ptr::NonNull,
	rc::Rc,
	sync::Arc,
};

use collections::{FxHashSet, HashMap};
use futures::channel::oneshot::Receiver;

use raw_window_handle as rwh;
use wayland_backend::client::ObjectId;
use wayland_client::WEnum;
use wayland_client::{
	Proxy,
	protocol::{wl_output, wl_surface},
};
use wayland_protocols::wp::viewporter::client::wp_viewport;
use wayland_protocols::xdg::decoration::zv1::client::zxdg_toplevel_decoration_v1;
use wayland_protocols::xdg::shell::client::xdg_surface;
use wayland_protocols::xdg::shell::client::xdg_toplevel::{self};
use wayland_protocols::{
	wp::fractional_scale::v1::client::wp_fractional_scale_v1,
	xdg::dialog::v1::client::xdg_dialog_v1::XdgDialogV1,
};
use wayland_protocols_plasma::blur::client::org_kde_kwin_blur;
use wayland_protocols_wlr::layer_shell::v1::client::zwlr_layer_surface_v1;

use crate::linux::wayland::{display::WaylandDisplay, serial::SerialKind};
use crate::linux::{Globals, Output, WaylandClientStatePtr, get_window};
use gpui::{
	AnyWindowHandle, Bounds, Capslock, Decorations, DevicePixels, GpuSpecs, Modifiers, Pixels,
	PlatformAtlas, PlatformDisplay, PlatformInput, PlatformInputHandler, PlatformWindow, Point,
	PromptButton, PromptLevel, RequestFrameOptions, ResizeEdge, Scene, Size, Tiling,
	WindowAppearance, WindowBackgroundAppearance, WindowBounds, WindowControlArea, WindowControls,
	WindowDecorations, WindowKind, WindowParams, layer_shell::LayerShellNotSupportedError, px,
	size,
};
use gpui_wgpu::{CompositorGpuHint, WgpuRenderer, WgpuSurfaceConfig, wgpu};

#[derive(Default)]
pub(crate) struct Callbacks {
	request_frame: Option<Box<dyn FnMut(RequestFrameOptions)>>,
	input: Option<Box<dyn FnMut(gpui::PlatformInput) -> gpui::DispatchEventResult>>,
	active_status_change: Option<Box<dyn FnMut(bool)>>,
	hover_status_change: Option<Box<dyn FnMut(bool)>>,
	resize: Option<Box<dyn FnMut(Size<Pixels>, f32)>>,
	moved: Option<Box<dyn FnMut()>>,
	should_close: Option<Box<dyn FnMut() -> bool>>,
	close: Option<Box<dyn FnOnce()>>,
	appearance_changed: Option<Box<dyn FnMut()>>,
	button_layout_changed: Option<Box<dyn FnMut()>>,
}

#[derive(Debug, Clone, Copy)]
struct RawWindow {
	window: *mut c_void,
	display: *mut c_void,
}

// Safety: The raw pointers in RawWindow point to Wayland surface/display
// which are valid for the window's lifetime. These are used only for
// passing to wgpu which needs Send+Sync for surface creation.
unsafe impl Send for RawWindow {}
unsafe impl Sync for RawWindow {}

impl rwh::HasWindowHandle for RawWindow {
	fn window_handle(&self) -> Result<rwh::WindowHandle<'_>, rwh::HandleError> {
		let window = NonNull::new(self.window).unwrap();
		let handle = rwh::WaylandWindowHandle::new(window);
		Ok(unsafe { rwh::WindowHandle::borrow_raw(handle.into()) })
	}
}
impl rwh::HasDisplayHandle for RawWindow {
	fn display_handle(&self) -> Result<rwh::DisplayHandle<'_>, rwh::HandleError> {
		let display = NonNull::new(self.display).unwrap();
		let handle = rwh::WaylandDisplayHandle::new(display);
		Ok(unsafe { rwh::DisplayHandle::borrow_raw(handle.into()) })
	}
}

#[derive(Debug)]
struct InProgressConfigure {
	size: Option<Size<Pixels>>,
	fullscreen: bool,
	maximized: bool,
	resizing: bool,
	tiling: Tiling,
}

pub struct WaylandWindowState {
	surface_state: WaylandSurfaceState,
	acknowledged_first_configure: bool,
	parent: Option<WaylandWindowStatePtr>,
	children: FxHashSet<ObjectId>,
	pub surface: wl_surface::WlSurface,
	app_id: Option<String>,
	appearance: WindowAppearance,
	blur: Option<org_kde_kwin_blur::OrgKdeKwinBlur>,
	viewport: Option<wp_viewport::WpViewport>,
	outputs: HashMap<ObjectId, Output>,
	display: Option<(ObjectId, Output)>,
	globals: Globals,
	renderer: WgpuRenderer,
	bounds: Bounds<Pixels>,
	scale: f32,
	input_handler: Option<PlatformInputHandler>,
	decorations: WindowDecorations,
	background_appearance: WindowBackgroundAppearance,
	fullscreen: bool,
	maximized: bool,
	tiling: Tiling,
	window_bounds: Bounds<Pixels>,
	client: WaylandClientStatePtr,
	handle: AnyWindowHandle,
	active: bool,
	hovered: bool,
	pub(crate) force_render_after_recovery: bool,
	renderer_presented: bool,
	in_progress_configure: Option<InProgressConfigure>,
	resize_throttle: bool,
	in_progress_window_controls: Option<WindowControls>,
	window_controls: WindowControls,
	client_inset: Option<Pixels>,
	accesskit_adapter: Option<accesskit_unix::Adapter>,
}

pub enum WaylandSurfaceState {
	Xdg(WaylandXdgSurfaceState),
	LayerShell(WaylandLayerSurfaceState),
}

impl WaylandSurfaceState {
	fn new(
		surface: &wl_surface::WlSurface,
		globals: &Globals,
		params: &WindowParams,
		parent: Option<WaylandWindowStatePtr>,
		target_output: Option<wl_output::WlOutput>,
	) -> anyhow::Result<Self> {
		// For layer_shell windows, create a layer surface instead of an xdg surface
		if let WindowKind::LayerShell(options) = &params.kind {
			let Some(layer_shell) = globals.layer_shell.as_ref() else {
				return Err(LayerShellNotSupportedError.into());
			};

			let layer_surface = layer_shell.get_layer_surface(
				&surface,
				target_output.as_ref(),
				super::layer_shell::wayland_layer(options.layer),
				options.namespace.clone(),
				&globals.qh,
				surface.id(),
			);

			let width = f32::from(params.bounds.size.width);
			let height = f32::from(params.bounds.size.height);
			layer_surface.set_size(width as u32, height as u32);

			layer_surface.set_anchor(super::layer_shell::wayland_anchor(options.anchor));
			layer_surface.set_keyboard_interactivity(
				super::layer_shell::wayland_keyboard_interactivity(options.keyboard_interactivity),
			);

			if let Some(margin) = options.margin {
				layer_surface.set_margin(
					f32::from(margin.0) as i32,
					f32::from(margin.1) as i32,
					f32::from(margin.2) as i32,
					f32::from(margin.3) as i32,
				)
			}

			if let Some(exclusive_zone) = options.exclusive_zone {
				layer_surface.set_exclusive_zone(f32::from(exclusive_zone) as i32);
			}

			if let Some(exclusive_edge) = options.exclusive_edge {
				layer_surface
					.set_exclusive_edge(super::layer_shell::wayland_anchor(exclusive_edge));
			}

			return Ok(WaylandSurfaceState::LayerShell(WaylandLayerSurfaceState {
				layer_surface,
			}));
		}

		// All other WindowKinds result in a regular xdg surface
		let xdg_surface = globals
			.wm_base
			.get_xdg_surface(&surface, &globals.qh, surface.id());

		let toplevel = xdg_surface.get_toplevel(&globals.qh, surface.id());
		let xdg_parent = parent.as_ref().and_then(|w| w.toplevel());

		if params.kind == WindowKind::Floating || params.kind == WindowKind::Dialog {
			toplevel.set_parent(xdg_parent.as_ref());
		}

		let dialog = if params.kind == WindowKind::Dialog {
			let dialog = globals.dialog.as_ref().map(|dialog| {
				let xdg_dialog = dialog.get_xdg_dialog(&toplevel, &globals.qh, ());
				xdg_dialog.set_modal();
				xdg_dialog
			});

			if let Some(parent) = parent.as_ref() {
				parent.add_child(surface.id());
			}

			dialog
		} else {
			None
		};

		if let Some(size) = params.window_min_size {
			toplevel.set_min_size(f32::from(size.width) as i32, f32::from(size.height) as i32);
		}

		// Attempt to set up window decorations based on the requested configuration
		let decoration = globals
			.decoration_manager
			.as_ref()
			.map(|decoration_manager| {
				decoration_manager.get_toplevel_decoration(&toplevel, &globals.qh, surface.id())
			});

		Ok(WaylandSurfaceState::Xdg(WaylandXdgSurfaceState {
			xdg_surface,
			toplevel,
			decoration,
			dialog,
		}))
	}
}

pub struct WaylandXdgSurfaceState {
	xdg_surface: xdg_surface::XdgSurface,
	toplevel: xdg_toplevel::XdgToplevel,
	decoration: Option<zxdg_toplevel_decoration_v1::ZxdgToplevelDecorationV1>,
	dialog: Option<XdgDialogV1>,
}

pub struct WaylandLayerSurfaceState {
	layer_surface: zwlr_layer_surface_v1::ZwlrLayerSurfaceV1,
}

impl WaylandSurfaceState {
	fn ack_configure(&self, serial: u32) {
		match self {
			WaylandSurfaceState::Xdg(WaylandXdgSurfaceState { xdg_surface, .. }) => {
				xdg_surface.ack_configure(serial);
			}
			WaylandSurfaceState::LayerShell(WaylandLayerSurfaceState { layer_surface, .. }) => {
				layer_surface.ack_configure(serial);
			}
		}
	}

	fn decoration(&self) -> Option<&zxdg_toplevel_decoration_v1::ZxdgToplevelDecorationV1> {
		if let WaylandSurfaceState::Xdg(WaylandXdgSurfaceState { decoration, .. }) = self {
			decoration.as_ref()
		} else {
			None
		}
	}

	fn toplevel(&self) -> Option<&xdg_toplevel::XdgToplevel> {
		if let WaylandSurfaceState::Xdg(WaylandXdgSurfaceState { toplevel, .. }) = self {
			Some(toplevel)
		} else {
			None
		}
	}

	fn set_geometry(&self, x: i32, y: i32, width: i32, height: i32) {
		match self {
			WaylandSurfaceState::Xdg(WaylandXdgSurfaceState { xdg_surface, .. }) => {
				xdg_surface.set_window_geometry(x, y, width, height);
			}
			WaylandSurfaceState::LayerShell(WaylandLayerSurfaceState { layer_surface, .. }) => {
				// cannot set window position of a layer surface
				layer_surface.set_size(width as u32, height as u32);
			}
		}
	}

	fn set_exclusive_zone(&self, zone: i32) {
		if let WaylandSurfaceState::LayerShell(WaylandLayerSurfaceState { layer_surface, .. }) =
			self
		{
			layer_surface.set_exclusive_zone(zone);
		}
	}

	fn destroy(&mut self) {
		match self {
			WaylandSurfaceState::Xdg(WaylandXdgSurfaceState {
				xdg_surface,
				toplevel,
				decoration: _decoration,
				dialog,
			}) => {
				// drop the dialog before toplevel so compositor can explicitly unapply it's effects
				if let Some(dialog) = dialog {
					dialog.destroy();
				}

				// The role object (toplevel) must always be destroyed before the xdg_surface.
				// See https://wayland.app/protocols/xdg-shell#xdg_surface:request:destroy
				toplevel.destroy();
				xdg_surface.destroy();
			}
			WaylandSurfaceState::LayerShell(WaylandLayerSurfaceState { layer_surface }) => {
				layer_surface.destroy();
			}
		}
	}
}

#[derive(Clone)]
pub struct WaylandWindowStatePtr {
	state: Rc<RefCell<WaylandWindowState>>,
	callbacks: Rc<RefCell<Callbacks>>,
}

impl WaylandWindowState {
	pub(crate) fn new(
		handle: AnyWindowHandle,
		surface: wl_surface::WlSurface,
		surface_state: WaylandSurfaceState,
		appearance: WindowAppearance,
		viewport: Option<wp_viewport::WpViewport>,
		client: WaylandClientStatePtr,
		globals: Globals,
		gpu_context: gpui_wgpu::GpuContext,
		compositor_gpu: Option<CompositorGpuHint>,
		gpu_requirements: Option<gpui_wgpu::WgpuDeviceRequirements>,
		options: WindowParams,
		parent: Option<WaylandWindowStatePtr>,
	) -> anyhow::Result<Self> {
		let renderer = {
			let raw_window = RawWindow {
				window: surface.id().as_ptr().cast::<c_void>(),
				display: surface
					.backend()
					.upgrade()
					.unwrap()
					.display_ptr()
					.cast::<c_void>(),
			};
			let config = WgpuSurfaceConfig {
				size: Size {
					width: DevicePixels(f32::from(options.bounds.size.width) as i32),
					height: DevicePixels(f32::from(options.bounds.size.height) as i32),
				},
				transparent: true,
				// Prefer Mailbox to avoid blocking. Falls back to FIFO if Mailbox is unsupported.
				preferred_present_mode: Some(wgpu::PresentMode::Mailbox),
			};
			WgpuRenderer::new(
				gpu_context,
				&raw_window,
				config,
				compositor_gpu,
				gpu_requirements,
			)?
		};

		if let WaylandSurfaceState::Xdg(ref xdg_state) = surface_state {
			if let Some(title) = options.titlebar.and_then(|titlebar| titlebar.title) {
				xdg_state.toplevel.set_title(title.to_string());
			}
			// Set max window size based on the GPU's maximum texture dimension.
			// This prevents the window from being resized larger than what the GPU can render.
			let max_texture_size = renderer.max_texture_size() as i32;
			xdg_state
				.toplevel
				.set_max_size(max_texture_size, max_texture_size);
		}

		Ok(Self {
			surface_state,
			acknowledged_first_configure: false,
			parent,
			children: FxHashSet::default(),
			surface,
			app_id: None,
			blur: None,
			viewport,
			globals,
			outputs: HashMap::default(),
			display: None,
			renderer,
			bounds: options.bounds,
			scale: 1.0,
			input_handler: None,
			decorations: WindowDecorations::Client,
			background_appearance: WindowBackgroundAppearance::Opaque,
			fullscreen: false,
			maximized: false,
			tiling: Tiling::default(),
			window_bounds: options.bounds,
			in_progress_configure: None,
			resize_throttle: false,
			client,
			appearance,
			handle,
			active: false,
			hovered: false,
			force_render_after_recovery: false,
			renderer_presented: false,
			in_progress_window_controls: None,
			window_controls: WindowControls::default(),
			client_inset: None,
			accesskit_adapter: None,
		})
	}

	pub fn is_transparent(&self) -> bool {
		self.decorations == WindowDecorations::Client
			|| self.background_appearance != WindowBackgroundAppearance::Opaque
	}

	fn update_subpixel_layout(&mut self) {
		use wayland_client::protocol::wl_output::Subpixel;
		let is_bgr = self
			.display
			.as_ref()
			.and_then(|(_, output)| output.subpixel)
			.is_some_and(|s| s == Subpixel::HorizontalBgr);
		self.renderer.set_subpixel_layout(is_bgr);
	}

	pub fn primary_output_scale(&mut self) -> i32 {
		let mut scale = 1;
		let mut current_output = self.display.take();
		for (id, output) in self.outputs.iter() {
			if let Some((_, output_data)) = &current_output {
				if output.scale > output_data.scale {
					current_output = Some((id.clone(), output.clone()));
				}
			} else {
				current_output = Some((id.clone(), output.clone()));
			}
			scale = scale.max(output.scale);
		}
		self.display = current_output;
		scale
	}

	pub fn inset(&self) -> Pixels {
		match self.decorations {
			WindowDecorations::Server => px(0.0),
			WindowDecorations::Client => self.client_inset.unwrap_or(px(0.0)),
		}
	}
}

pub(crate) struct WaylandWindow(pub WaylandWindowStatePtr);
pub enum ImeInput {
	InsertText(String),
	SetMarkedText(String),
	UnmarkText,
	DeleteText,
}

impl Drop for WaylandWindow {
	fn drop(&mut self) {
		let mut state = self.0.state.borrow_mut();
		let surface_id = state.surface.id();
		if let Some(parent) = state.parent.as_ref() {
			parent.state.borrow_mut().children.remove(&surface_id);
		}

		let client = state.client.clone();

		state.renderer.destroy();

		// Destroy blur first, this has no dependencies.
		if let Some(blur) = &state.blur {
			blur.release();
		}

		// Decorations must be destroyed before the xdg state.
		// See https://wayland.app/protocols/xdg-decoration-unstable-v1#zxdg_toplevel_decoration_v1
		if let Some(decoration) = &state.surface_state.decoration() {
			decoration.destroy();
		}

		// Surface state might contain xdg_toplevel/xdg_surface which can be destroyed now that
		// decorations are gone. layer_surface has no dependencies.
		state.surface_state.destroy();

		// Viewport must be destroyed before the wl_surface.
		// See https://wayland.app/protocols/viewporter#wp_viewport
		if let Some(viewport) = &state.viewport {
			viewport.destroy();
		}

		// The wl_surface itself should always be destroyed last.
		state.surface.destroy();

		let state_ptr = self.0.clone();
		state
			.globals
			.executor
			.spawn(async move {
				state_ptr.close();
				client.drop_window(&surface_id)
			})
			.detach();
		drop(state);
	}
}

impl WaylandWindow {
	fn borrow(&self) -> Ref<'_, WaylandWindowState> {
		self.0.state.borrow()
	}

	fn borrow_mut(&self) -> RefMut<'_, WaylandWindowState> {
		self.0.state.borrow_mut()
	}

	pub fn new(
		handle: AnyWindowHandle,
		globals: Globals,
		gpu_context: gpui_wgpu::GpuContext,
		compositor_gpu: Option<CompositorGpuHint>,
		gpu_requirements: Option<gpui_wgpu::WgpuDeviceRequirements>,
		client: WaylandClientStatePtr,
		params: WindowParams,
		appearance: WindowAppearance,
		parent: Option<WaylandWindowStatePtr>,
		target_output: Option<wl_output::WlOutput>,
	) -> anyhow::Result<(Self, ObjectId)> {
		let surface = globals.compositor.create_surface(&globals.qh, ());
		let surface_state =
			WaylandSurfaceState::new(&surface, &globals, &params, parent.clone(), target_output)?;

		if let Some(fractional_scale_manager) = globals.fractional_scale_manager.as_ref() {
			fractional_scale_manager.get_fractional_scale(&surface, &globals.qh, surface.id());
		}

		let viewport = globals
			.viewporter
			.as_ref()
			.map(|viewporter| viewporter.get_viewport(&surface, &globals.qh, ()));

		let this = Self(WaylandWindowStatePtr {
			state: Rc::new(RefCell::new(WaylandWindowState::new(
				handle,
				surface.clone(),
				surface_state,
				appearance,
				viewport,
				client,
				globals,
				gpu_context,
				compositor_gpu,
				gpu_requirements,
				params,
				parent,
			)?)),
			callbacks: Rc::new(RefCell::new(Callbacks::default())),
		});

		// Kick things off
		surface.commit();

		Ok((this, surface.id()))
	}
}

impl WaylandWindowStatePtr {
	pub fn handle(&self) -> AnyWindowHandle {
		self.state.borrow().handle
	}

	pub fn surface(&self) -> wl_surface::WlSurface {
		self.state.borrow().surface.clone()
	}

	pub fn toplevel(&self) -> Option<xdg_toplevel::XdgToplevel> {
		self.state.borrow().surface_state.toplevel().cloned()
	}

	pub fn ptr_eq(&self, other: &Self) -> bool {
		Rc::ptr_eq(&self.state, &other.state)
	}

	pub fn add_child(&self, child: ObjectId) {
		let mut state = self.state.borrow_mut();
		state.children.insert(child);
	}

	pub fn is_blocked(&self) -> bool {
		let state = self.state.borrow();
		!state.children.is_empty()
	}

	pub fn frame(&self) {
		let mut state = self.state.borrow_mut();
		state.surface.frame(&state.globals.qh, state.surface.id());
		state.resize_throttle = false;
		let force_render = state.force_render_after_recovery;
		state.force_render_after_recovery = false;
		drop(state);

		let mut cb = self.callbacks.borrow_mut();
		if let Some(fun) = cb.request_frame.as_mut() {
			fun(RequestFrameOptions {
				force_render,
				..Default::default()
			});
		}
	}

	pub fn handle_xdg_surface_event(&self, event: xdg_surface::Event) {
		if let xdg_surface::Event::Configure { serial } = event {
			{
				let mut state = self.state.borrow_mut();
				if let Some(window_controls) = state.in_progress_window_controls.take() {
					state.window_controls = window_controls;

					drop(state);
					let mut callbacks = self.callbacks.borrow_mut();
					if let Some(appearance_changed) = callbacks.appearance_changed.as_mut() {
						appearance_changed();
					}
				}
			}
			{
				let mut state = self.state.borrow_mut();

				if let Some(mut configure) = state.in_progress_configure.take() {
					let got_unmaximized = state.maximized && !configure.maximized;
					state.fullscreen = configure.fullscreen;
					state.maximized = configure.maximized;
					state.tiling = configure.tiling;
					// Limit interactive resizes to once per vblank
					if configure.resizing && state.resize_throttle {
						state.surface_state.ack_configure(serial);
						return;
					} else if configure.resizing {
						state.resize_throttle = true;
					}
					if !configure.fullscreen && !configure.maximized {
						configure.size = if got_unmaximized {
							Some(state.window_bounds.size)
						} else {
							compute_outer_size(state.inset(), configure.size, state.tiling)
						};
						if let Some(size) = configure.size {
							state.window_bounds = Bounds {
								origin: Point::default(),
								size,
							};
						}
					}
					drop(state);
					if let Some(size) = configure.size {
						self.resize(size);
					}
				}
			}
			let mut state = self.state.borrow_mut();
			state.surface_state.ack_configure(serial);

			let window_geometry = inset_by_tiling(
				state.bounds.map_origin(|_| px(0.0)),
				state.inset(),
				state.tiling,
			)
			.map(|v| f32::from(v) as i32)
			.map_size(|v| if v <= 0 { 1 } else { v });

			state.surface_state.set_geometry(
				window_geometry.origin.x,
				window_geometry.origin.y,
				window_geometry.size.width,
				window_geometry.size.height,
			);

			let request_frame_callback = !state.acknowledged_first_configure;
			if request_frame_callback {
				state.acknowledged_first_configure = true;
				drop(state);
				self.frame();
			}
		}
	}

	pub fn handle_toplevel_decoration_event(&self, event: zxdg_toplevel_decoration_v1::Event) {
		if let zxdg_toplevel_decoration_v1::Event::Configure { mode } = event {
			match mode {
				WEnum::Value(zxdg_toplevel_decoration_v1::Mode::ServerSide) => {
					self.state.borrow_mut().decorations = WindowDecorations::Server;
					let callback = self.callbacks.borrow_mut().appearance_changed.take();
					if let Some(mut fun) = callback {
						fun();
						self.callbacks.borrow_mut().appearance_changed = Some(fun);
					}
				}
				WEnum::Value(zxdg_toplevel_decoration_v1::Mode::ClientSide) => {
					self.state.borrow_mut().decorations = WindowDecorations::Client;
					// Update background to be transparent
					let callback = self.callbacks.borrow_mut().appearance_changed.take();
					if let Some(mut fun) = callback {
						fun();
						self.callbacks.borrow_mut().appearance_changed = Some(fun);
					}
				}
				WEnum::Value(_) => {
					log::warn!("Unknown decoration mode");
				}
				WEnum::Unknown(v) => {
					log::warn!("Unknown decoration mode: {}", v);
				}
			}
		}
	}

	pub fn handle_fractional_scale_event(&self, event: wp_fractional_scale_v1::Event) {
		if let wp_fractional_scale_v1::Event::PreferredScale { scale } = event {
			self.rescale(scale as f32 / 120.0);
		}
	}

	pub fn handle_toplevel_event(&self, event: xdg_toplevel::Event) -> bool {
		match event {
			xdg_toplevel::Event::Configure {
				width,
				height,
				states,
			} => {
				let size = if width == 0 || height == 0 {
					None
				} else {
					Some(size(px(width as f32), px(height as f32)))
				};

				let states = extract_states::<xdg_toplevel::State>(&states);

				let mut tiling = Tiling::default();
				let mut fullscreen = false;
				let mut maximized = false;
				let mut resizing = false;

				for state in states {
					match state {
						xdg_toplevel::State::Maximized => {
							maximized = true;
						}
						xdg_toplevel::State::Fullscreen => {
							fullscreen = true;
						}
						xdg_toplevel::State::Resizing => resizing = true,
						xdg_toplevel::State::TiledTop => {
							tiling.top = true;
						}
						xdg_toplevel::State::TiledLeft => {
							tiling.left = true;
						}
						xdg_toplevel::State::TiledRight => {
							tiling.right = true;
						}
						xdg_toplevel::State::TiledBottom => {
							tiling.bottom = true;
						}
						_ => {
							// noop
						}
					}
				}

				if fullscreen || maximized {
					tiling = Tiling::tiled();
				}

				let mut state = self.state.borrow_mut();
				state.in_progress_configure = Some(InProgressConfigure {
					size,
					fullscreen,
					maximized,
					resizing,
					tiling,
				});

				false
			}
			xdg_toplevel::Event::Close => {
				let mut cb = self.callbacks.borrow_mut();
				if let Some(mut should_close) = cb.should_close.take() {
					let result = (should_close)();
					cb.should_close = Some(should_close);
					if result {
						drop(cb);
						self.close();
					}
					result
				} else {
					true
				}
			}
			xdg_toplevel::Event::WmCapabilities { capabilities } => {
				let mut window_controls = WindowControls {
					maximize: false,
					minimize: false,
					fullscreen: false,
					window_menu: false,
				};

				let states = extract_states::<xdg_toplevel::WmCapabilities>(&capabilities);

				for state in states {
					match state {
						xdg_toplevel::WmCapabilities::Maximize => {
							window_controls.maximize = true;
						}
						xdg_toplevel::WmCapabilities::Minimize => {
							window_controls.minimize = true;
						}
						xdg_toplevel::WmCapabilities::Fullscreen => {
							window_controls.fullscreen = true;
						}
						xdg_toplevel::WmCapabilities::WindowMenu => {
							window_controls.window_menu = true;
						}
						_ => {}
					}
				}

				let mut state = self.state.borrow_mut();
				state.in_progress_window_controls = Some(window_controls);
				false
			}
			_ => false,
		}
	}

	pub fn handle_layersurface_event(&self, event: zwlr_layer_surface_v1::Event) -> bool {
		match event {
			zwlr_layer_surface_v1::Event::Configure {
				width,
				height,
				serial,
			} => {
				let size = if width == 0 || height == 0 {
					None
				} else {
					Some(size(px(width as f32), px(height as f32)))
				};

				let mut state = self.state.borrow_mut();
				state.in_progress_configure = Some(InProgressConfigure {
					size,
					fullscreen: false,
					maximized: false,
					resizing: false,
					tiling: Tiling::default(),
				});
				drop(state);

				// just do the same thing we'd do as an xdg_surface
				self.handle_xdg_surface_event(xdg_surface::Event::Configure { serial });

				false
			}
			zwlr_layer_surface_v1::Event::Closed => {
				// unlike xdg, we don't have a choice here: the surface is closing.
				true
			}
			_ => false,
		}
	}

	#[allow(clippy::mutable_key_type)]
	pub fn handle_surface_event(
		&self,
		event: wl_surface::Event,
		outputs: HashMap<ObjectId, Output>,
	) {
		let mut state = self.state.borrow_mut();

		match event {
			wl_surface::Event::Enter { output } => {
				let id = output.id();

				let Some(output) = outputs.get(&id) else {
					return;
				};

				state.outputs.insert(id, output.clone());

				let scale = state.primary_output_scale();
				state.update_subpixel_layout();

				// We use `PreferredBufferScale` instead to set the scale if it's available
				if state.surface.version() < wl_surface::EVT_PREFERRED_BUFFER_SCALE_SINCE {
					state.surface.set_buffer_scale(scale);
					drop(state);
					self.rescale(scale as f32);
				}
			}
			wl_surface::Event::Leave { output } => {
				state.outputs.remove(&output.id());

				let scale = state.primary_output_scale();
				state.update_subpixel_layout();

				// We use `PreferredBufferScale` instead to set the scale if it's available
				if state.surface.version() < wl_surface::EVT_PREFERRED_BUFFER_SCALE_SINCE {
					state.surface.set_buffer_scale(scale);
					drop(state);
					self.rescale(scale as f32);
				}
			}
			wl_surface::Event::PreferredBufferScale { factor } => {
				// We use `WpFractionalScale` instead to set the scale if it's available
				if state.globals.fractional_scale_manager.is_none() {
					state.surface.set_buffer_scale(factor);
					drop(state);
					self.rescale(factor as f32);
				}
			}
			_ => {}
		}
	}

	pub fn handle_ime(&self, ime: ImeInput) {
		if self.is_blocked() {
			return;
		}
		let mut state = self.state.borrow_mut();
		if let Some(mut input_handler) = state.input_handler.take() {
			drop(state);
			match ime {
				ImeInput::InsertText(text) => {
					input_handler.replace_text_in_range(None, &text);
				}
				ImeInput::SetMarkedText(text) => {
					input_handler.replace_and_mark_text_in_range(None, &text, None);
				}
				ImeInput::UnmarkText => {
					input_handler.unmark_text();
				}
				ImeInput::DeleteText => {
					if let Some(marked) = input_handler.marked_text_range() {
						input_handler.replace_text_in_range(Some(marked), "");
					}
				}
			}
			self.state.borrow_mut().input_handler = Some(input_handler);
		}
	}

	pub fn get_ime_area(&self) -> Option<Bounds<Pixels>> {
		let mut state = self.state.borrow_mut();
		let mut bounds: Option<Bounds<Pixels>> = None;
		if let Some(mut input_handler) = state.input_handler.take() {
			drop(state);
			if let Some(selection) = input_handler.marked_text_range() {
				bounds = input_handler.bounds_for_range(selection.start..selection.start);
			}
			self.state.borrow_mut().input_handler = Some(input_handler);
		}
		bounds
	}

	pub fn set_size_and_scale(&self, size: Option<Size<Pixels>>, scale: Option<f32>) {
		let (size, scale) = {
			let mut state = self.state.borrow_mut();
			if size.is_none_or(|size| size == state.bounds.size)
				&& scale.is_none_or(|scale| scale == state.scale)
			{
				return;
			}
			if let Some(size) = size {
				state.bounds.size = size;
			}
			if let Some(scale) = scale {
				state.scale = scale;
			}
			let device_bounds = state.bounds.to_device_pixels(state.scale);
			state.renderer.update_drawable_size(device_bounds.size);
			(state.bounds.size, state.scale)
		};

		let callback = self.callbacks.borrow_mut().resize.take();
		if let Some(mut fun) = callback {
			fun(size, scale);
			self.callbacks.borrow_mut().resize = Some(fun);
		}

		{
			let state = self.state.borrow();
			if let Some(viewport) = &state.viewport {
				viewport
					.set_destination(f32::from(size.width) as i32, f32::from(size.height) as i32);
			}
		}
	}

	pub fn resize(&self, size: Size<Pixels>) {
		self.set_size_and_scale(Some(size), None);
	}

	pub fn rescale(&self, scale: f32) {
		self.set_size_and_scale(None, Some(scale));
	}

	pub fn close(&self) {
		let state = self.state.borrow();
		let client = state.client.get_client();
		#[allow(clippy::mutable_key_type)]
		let children = state.children.clone();
		drop(state);

		for child in children {
			let mut client_state = client.borrow_mut();
			let window = get_window(&mut client_state, &child);
			drop(client_state);

			if let Some(child) = window {
				child.close();
			}
		}
		let mut callbacks = self.callbacks.borrow_mut();
		if let Some(fun) = callbacks.close.take() {
			fun()
		}
	}

	pub fn handle_input(&self, input: PlatformInput) {
		if self.is_blocked() {
			return;
		}
		let callback = self.callbacks.borrow_mut().input.take();
		if let Some(mut fun) = callback {
			let result = fun(input.clone());
			self.callbacks.borrow_mut().input = Some(fun);
			if !result.propagate {
				return;
			}
		}
		if let PlatformInput::KeyDown(event) = input
			&& event.keystroke.modifiers.is_subset_of(&Modifiers::shift())
			&& let Some(key_char) = &event.keystroke.key_char
		{
			let mut state = self.state.borrow_mut();
			if let Some(mut input_handler) = state.input_handler.take() {
				drop(state);
				input_handler.replace_text_in_range(None, key_char);
				self.state.borrow_mut().input_handler = Some(input_handler);
			}
		}
	}

	pub fn set_focused(&self, focus: bool) {
		self.state.borrow_mut().active = focus;
		let callback = self.callbacks.borrow_mut().active_status_change.take();
		if let Some(mut fun) = callback {
			fun(focus);
			self.callbacks.borrow_mut().active_status_change = Some(fun);
		}
		if let Some(adapter) = self.state.borrow_mut().accesskit_adapter.as_mut() {
			adapter.update_window_focus_state(focus);
		}
	}

	pub fn set_hovered(&self, focus: bool) {
		let callback = self.callbacks.borrow_mut().hover_status_change.take();
		if let Some(mut fun) = callback {
			fun(focus);
			self.callbacks.borrow_mut().hover_status_change = Some(fun);
		}
	}

	pub fn set_appearance(&mut self, appearance: WindowAppearance) {
		self.state.borrow_mut().appearance = appearance;

		let callback = self.callbacks.borrow_mut().appearance_changed.take();
		if let Some(mut fun) = callback {
			fun();
			self.callbacks.borrow_mut().appearance_changed = Some(fun);
		}
	}

	pub fn set_button_layout(&self) {
		let callback = self.callbacks.borrow_mut().button_layout_changed.take();
		if let Some(mut fun) = callback {
			fun();
			self.callbacks.borrow_mut().button_layout_changed = Some(fun);
		}
	}

	pub fn primary_output_scale(&self) -> i32 {
		self.state.borrow_mut().primary_output_scale()
	}
}

fn extract_states<'a, S: TryFrom<u32> + 'a>(states: &'a [u8]) -> impl Iterator<Item = S> + 'a
where
	<S as TryFrom<u32>>::Error: 'a,
{
	states
		.chunks_exact(4)
		.flat_map(TryInto::<[u8; 4]>::try_into)
		.map(u32::from_ne_bytes)
		.flat_map(S::try_from)
}

impl rwh::HasWindowHandle for WaylandWindow {
	fn window_handle(&self) -> Result<rwh::WindowHandle<'_>, rwh::HandleError> {
		let surface = self.0.surface().id().as_ptr() as *mut libc::c_void;
		let c_ptr = NonNull::new(surface).ok_or(rwh::HandleError::Unavailable)?;
		let handle = rwh::WaylandWindowHandle::new(c_ptr);
		let raw_handle = rwh::RawWindowHandle::Wayland(handle);
		Ok(unsafe { rwh::WindowHandle::borrow_raw(raw_handle) })
	}
}

impl rwh::HasDisplayHandle for WaylandWindow {
	fn display_handle(&self) -> Result<rwh::DisplayHandle<'_>, rwh::HandleError> {
		let display = self
			.0
			.surface()
			.backend()
			.upgrade()
			.ok_or(rwh::HandleError::Unavailable)?
			.display_ptr() as *mut libc::c_void;

		let c_ptr = NonNull::new(display).ok_or(rwh::HandleError::Unavailable)?;
		let handle = rwh::WaylandDisplayHandle::new(c_ptr);
		let raw_handle = rwh::RawDisplayHandle::Wayland(handle);
		Ok(unsafe { rwh::DisplayHandle::borrow_raw(raw_handle) })
	}
}

impl PlatformWindow for WaylandWindow {
	fn bounds(&self) -> Bounds<Pixels> {
		self.borrow().bounds
	}

	fn is_maximized(&self) -> bool {
		self.borrow().maximized
	}

	fn window_bounds(&self) -> WindowBounds {
		let state = self.borrow();
		if state.fullscreen {
			WindowBounds::Fullscreen(state.window_bounds)
		} else if state.maximized {
			WindowBounds::Maximized(state.window_bounds)
		} else {
			drop(state);
			WindowBounds::Windowed(self.bounds())
		}
	}

	fn inner_window_bounds(&self) -> WindowBounds {
		let state = self.borrow();
		if state.fullscreen {
			WindowBounds::Fullscreen(state.window_bounds)
		} else if state.maximized {
			WindowBounds::Maximized(state.window_bounds)
		} else {
			let inset = state.inset();
			drop(state);
			WindowBounds::Windowed(self.bounds().inset(inset))
		}
	}

	fn content_size(&self) -> Size<Pixels> {
		self.borrow().bounds.size
	}

	fn resize(&mut self, size: Size<Pixels>) {
		let state = self.borrow();
		let state_ptr = self.0.clone();

		// Keep window geometry consistent with configure handling. On Wayland, window geometry is
		// surface-local: resizing should not attempt to translate the window; the compositor
		// controls placement. We also account for client-side decoration insets and tiling.
		let window_geometry = inset_by_tiling(
			Bounds {
				origin: Point::default(),
				size,
			},
			state.inset(),
			state.tiling,
		)
		.map(|v| f32::from(v) as i32)
		.map_size(|v| if v <= 0 { 1 } else { v });

		state.surface_state.set_geometry(
			window_geometry.origin.x,
			window_geometry.origin.y,
			window_geometry.size.width,
			window_geometry.size.height,
		);

		state
			.globals
			.executor
			.spawn(async move { state_ptr.resize(size) })
			.detach();
	}

	fn scale_factor(&self) -> f32 {
		self.borrow().scale
	}

	fn appearance(&self) -> WindowAppearance {
		self.borrow().appearance
	}

	fn display(&self) -> Option<Rc<dyn PlatformDisplay>> {
		let state = self.borrow();
		state.display.as_ref().map(|(id, display)| {
			Rc::new(WaylandDisplay {
				id: id.clone(),
				name: display.name.clone(),
				bounds: display.bounds.to_pixels(state.scale),
			}) as Rc<dyn PlatformDisplay>
		})
	}

	fn mouse_position(&self) -> Point<Pixels> {
		self.borrow()
			.client
			.get_client()
			.borrow()
			.mouse_location
			.unwrap_or_default()
	}

	fn modifiers(&self) -> Modifiers {
		self.borrow().client.get_client().borrow().modifiers
	}

	fn capslock(&self) -> Capslock {
		self.borrow().client.get_client().borrow().capslock
	}

	fn set_input_handler(&mut self, input_handler: PlatformInputHandler) {
		self.borrow_mut().input_handler = Some(input_handler);
	}

	fn take_input_handler(&mut self) -> Option<PlatformInputHandler> {
		self.borrow_mut().input_handler.take()
	}

	fn prompt(
		&self,
		_level: PromptLevel,
		_msg: &str,
		_detail: Option<&str>,
		_answers: &[PromptButton],
	) -> Option<Receiver<usize>> {
		None
	}

	fn activate(&self) {
		// Try to request an activation token. Even though the activation is likely going to be rejected,
		// KWin and Mutter can use the app_id to visually indicate we're requesting attention.
		let state = self.borrow();
		if let (Some(activation), Some(app_id)) = (&state.globals.activation, state.app_id.clone())
		{
			state.client.set_pending_activation(state.surface.id());
			let token = activation.get_activation_token(&state.globals.qh, ());
			// The serial isn't exactly important here, since the activation is probably going to be rejected anyway.
			let serial = state.client.get_serial(SerialKind::MousePress);
			token.set_app_id(app_id);
			token.set_serial(serial, &state.globals.seat);
			token.set_surface(&state.surface);
			token.commit();
		}
	}

	fn is_active(&self) -> bool {
		self.borrow().active
	}

	fn is_hovered(&self) -> bool {
		self.borrow().hovered
	}

	fn set_title(&mut self, title: &str) {
		if let Some(toplevel) = self.borrow().surface_state.toplevel() {
			toplevel.set_title(title.to_string());
		}
	}

	fn set_app_id(&mut self, app_id: &str) {
		let mut state = self.borrow_mut();
		if let Some(toplevel) = state.surface_state.toplevel() {
			toplevel.set_app_id(app_id.to_owned());
		}
		state.app_id = Some(app_id.to_owned());
	}

	fn set_background_appearance(&self, background_appearance: WindowBackgroundAppearance) {
		let mut state = self.borrow_mut();
		state.background_appearance = background_appearance;
		update_window(state);
	}

	fn background_appearance(&self) -> WindowBackgroundAppearance {
		self.borrow().background_appearance
	}

	fn is_subpixel_rendering_supported(&self) -> bool {
		let client = self.borrow().client.get_client();
		let state = client.borrow();
		state
			.gpu_context
			.borrow()
			.as_ref()
			.is_some_and(|ctx| ctx.supports_dual_source_blending())
	}

	fn minimize(&self) {
		if let Some(toplevel) = self.borrow().surface_state.toplevel() {
			toplevel.set_minimized();
		}
	}

	fn zoom(&self) {
		let state = self.borrow();
		if let Some(toplevel) = state.surface_state.toplevel() {
			if !state.maximized {
				toplevel.set_maximized();
			} else {
				toplevel.unset_maximized();
			}
		}
	}

	fn toggle_fullscreen(&self) {
		let state = self.borrow();
		if let Some(toplevel) = state.surface_state.toplevel() {
			if !state.fullscreen {
				toplevel.set_fullscreen(None);
			} else {
				toplevel.unset_fullscreen();
			}
		}
	}

	fn is_fullscreen(&self) -> bool {
		self.borrow().fullscreen
	}

	fn on_request_frame(&self, callback: Box<dyn FnMut(RequestFrameOptions)>) {
		self.0.callbacks.borrow_mut().request_frame = Some(callback);
	}

	fn on_input(&self, callback: Box<dyn FnMut(PlatformInput) -> gpui::DispatchEventResult>) {
		self.0.callbacks.borrow_mut().input = Some(callback);
	}

	fn on_active_status_change(&self, callback: Box<dyn FnMut(bool)>) {
		self.0.callbacks.borrow_mut().active_status_change = Some(callback);
	}

	fn on_hover_status_change(&self, callback: Box<dyn FnMut(bool)>) {
		self.0.callbacks.borrow_mut().hover_status_change = Some(callback);
	}

	fn on_resize(&self, callback: Box<dyn FnMut(Size<Pixels>, f32)>) {
		self.0.callbacks.borrow_mut().resize = Some(callback);
	}

	fn on_moved(&self, callback: Box<dyn FnMut()>) {
		self.0.callbacks.borrow_mut().moved = Some(callback);
	}

	fn on_should_close(&self, callback: Box<dyn FnMut() -> bool>) {
		self.0.callbacks.borrow_mut().should_close = Some(callback);
	}

	fn on_close(&self, callback: Box<dyn FnOnce()>) {
		self.0.callbacks.borrow_mut().close = Some(callback);
	}

	fn on_hit_test_window_control(&self, _callback: Box<dyn FnMut() -> Option<WindowControlArea>>) {
	}

	fn on_appearance_changed(&self, callback: Box<dyn FnMut()>) {
		self.0.callbacks.borrow_mut().appearance_changed = Some(callback);
	}

	fn on_button_layout_changed(&self, callback: Box<dyn FnMut()>) {
		self.0.callbacks.borrow_mut().button_layout_changed = Some(callback);
	}

	fn draw(&self, scene: &Scene) {
		let mut state = self.borrow_mut();

		if state.renderer.device_lost() {
			let raw_window = RawWindow {
				window: state.surface.id().as_ptr().cast::<std::ffi::c_void>(),
				display: state
					.surface
					.backend()
					.upgrade()
					.unwrap()
					.display_ptr()
					.cast::<std::ffi::c_void>(),
			};
			match state.renderer.recover(&raw_window) {
				Ok(()) => {}
				Err(err) => {
					log::warn!("GPU recovery failed, will retry on next frame: {err}");
				}
			}

			state.force_render_after_recovery = true;
			return;
		}

		state.renderer_presented = state.renderer.draw(scene);

		if state.renderer.needs_redraw() {
			state.force_render_after_recovery = true;
		}
	}

	fn completed_frame(&self) {
		let mut state = self.borrow_mut();

		// Work around a bug in old versions of wlroots where committing without a buffer attached
		// can cause invalid synchronization that leads to graphical corruption.
		if !state.renderer_presented {
			state.surface.commit();
		}

		state.renderer_presented = false;
	}

	fn sprite_atlas(&self) -> Arc<dyn PlatformAtlas> {
		let state = self.borrow();
		state.renderer.sprite_atlas().clone()
	}

	fn show_window_menu(&self, position: Point<Pixels>) {
		let state = self.borrow();
		let serial = state.client.get_serial(SerialKind::MousePress);
		if let Some(toplevel) = state.surface_state.toplevel() {
			toplevel.show_window_menu(
				&state.globals.seat,
				serial,
				f32::from(position.x) as i32,
				f32::from(position.y) as i32,
			);
		}
	}

	fn start_window_move(&self) {
		let state = self.borrow();
		let serial = state.client.get_serial(SerialKind::MousePress);
		if let Some(toplevel) = state.surface_state.toplevel() {
			toplevel._move(&state.globals.seat, serial);
		}
	}

	fn start_window_resize(&self, edge: gpui::ResizeEdge) {
		let state = self.borrow();
		if let Some(toplevel) = state.surface_state.toplevel() {
			toplevel.resize(
				&state.globals.seat,
				state.client.get_serial(SerialKind::MousePress),
				edge.to_xdg(),
			)
		}
	}

	fn set_input_region(&self, rects: &[Bounds<Pixels>]) {
		let state = self.borrow();
		if rects.is_empty() {
			state.surface.set_input_region(None);
		} else {
			let region = state
				.globals
				.compositor
				.create_region(&state.globals.qh, ());
			rects
				.iter()
				.map(|rect| rect.map(|pixels| f32::from(pixels) as i32))
				.for_each(|rect| {
					region.add(
						rect.origin.x,
						rect.origin.y,
						rect.size.width,
						rect.size.height,
					)
				});
			state.surface.set_input_region(Some(&region));
			region.destroy();
		}
		state.surface.commit();
	}

	fn set_exclusive_zone(&self, zone: Pixels) {
		let state = self.borrow();
		state
			.surface_state
			.set_exclusive_zone(f32::from(zone) as i32);
		state.surface.commit();
	}

	fn window_decorations(&self) -> Decorations {
		let state = self.borrow();
		match state.decorations {
			WindowDecorations::Server => Decorations::Server,
			WindowDecorations::Client => Decorations::Client {
				tiling: state.tiling,
			},
		}
	}

	fn request_decorations(&self, decorations: WindowDecorations) {
		let mut state = self.borrow_mut();
		match state.surface_state.decoration().as_ref() {
			Some(decoration) => {
				decoration.set_mode(decorations.to_xdg());
				state.decorations = decorations;
				update_window(state);
			}
			None => {
				if matches!(decorations, WindowDecorations::Server) {
					log::info!(
						"Server-side decorations requested, but the Wayland server does not support them. Falling back to client-side decorations."
					);
				}
				state.decorations = WindowDecorations::Client;
				update_window(state);
			}
		}
	}

	fn window_controls(&self) -> WindowControls {
		self.borrow().window_controls
	}

	fn set_client_inset(&self, inset: Pixels) {
		let mut state = self.borrow_mut();
		if Some(inset) != state.client_inset {
			state.client_inset = Some(inset);
			update_window(state);
		}
	}

	fn update_ime_position(&self, bounds: Bounds<Pixels>) {
		let state = self.borrow();
		state.client.update_ime_position(bounds);
	}

	fn gpu_specs(&self) -> Option<GpuSpecs> {
		self.borrow().renderer.gpu_specs().into()
	}

	fn gpu_context(&self) -> Option<Box<dyn std::any::Any>> {
		let (device, queue) = self.borrow().renderer.gpu_context();
		Some(Box::new((device, queue)))
	}

	fn gpu_device_lost(&self) -> Option<bool> {
		// Only loads an atomic flag — safe even mid-recovery, when
		// `gpu_context` would panic on the torn-down resources.
		Some(self.borrow().renderer.device_lost())
	}

	fn play_system_bell(&self) {
		let state = self.borrow();
		let surface = if state.surface_state.toplevel().is_some() {
			Some(&state.surface)
		} else {
			None
		};
		if let Some(bell) = state.globals.system_bell.as_ref() {
			bell.ring(surface);
		}
	}

	fn a11y_init(&self, callbacks: gpui::A11yCallbacks) {
		let activation_handler = TrivialActivationHandler {
			callback: callbacks.activation,
		};
		let action_handler = TrivialActionHandler(callbacks.action);
		let deactivation_handler = TrivialDeactivationHandler {
			callback: callbacks.deactivation,
		};

		let adapter =
			accesskit_unix::Adapter::new(activation_handler, action_handler, deactivation_handler);

		self.borrow_mut().accesskit_adapter = Some(adapter);
	}

	fn a11y_tree_update(&self, tree_update: accesskit::TreeUpdate) {
		let mut state = self.borrow_mut();
		if let Some(adapter) = state.accesskit_adapter.as_mut() {
			adapter.update_if_active(|| tree_update);
		}
	}

	fn a11y_update_window_bounds(&self) {
		// Wayland doesn't expose window position, so this is a no-op
	}
}

struct TrivialActivationHandler {
	callback: Box<dyn Fn() -> Option<accesskit::TreeUpdate> + Send + 'static>,
}

impl accesskit::ActivationHandler for TrivialActivationHandler {
	fn request_initial_tree(&mut self) -> Option<accesskit::TreeUpdate> {
		(self.callback)()
	}
}

struct TrivialActionHandler(Box<dyn Fn(accesskit::ActionRequest) + Send + 'static>);

impl accesskit::ActionHandler for TrivialActionHandler {
	fn do_action(&mut self, request: accesskit::ActionRequest) {
		(self.0)(request);
	}
}

struct TrivialDeactivationHandler {
	callback: Box<dyn Fn() + Send + 'static>,
}

impl accesskit::DeactivationHandler for TrivialDeactivationHandler {
	fn deactivate_accessibility(&mut self) {
		(self.callback)();
	}
}

fn update_window(mut state: RefMut<WaylandWindowState>) {
	let opaque = !state.is_transparent();

	state.renderer.update_transparency(!opaque);
	let opaque_area = state.window_bounds.map(|v| f32::from(v) as i32);
	opaque_area.inset(f32::from(state.inset()) as i32);

	let region = state
		.globals
		.compositor
		.create_region(&state.globals.qh, ());
	region.add(
		opaque_area.origin.x,
		opaque_area.origin.y,
		opaque_area.size.width,
		opaque_area.size.height,
	);

	// Note that rounded corners make this rectangle API hard to work with.
	// As this is common when using CSD, let's just disable this API.
	if state.background_appearance == WindowBackgroundAppearance::Opaque
		&& state.decorations == WindowDecorations::Server
	{
		// Promise the compositor that this region of the window surface
		// contains no transparent pixels. This allows the compositor to skip
		// updating whatever is behind the surface for better performance.
		state.surface.set_opaque_region(Some(&region));
	} else {
		state.surface.set_opaque_region(None);
	}

	if let Some(ref blur_manager) = state.globals.blur_manager {
		if state.background_appearance == WindowBackgroundAppearance::Blurred {
			if state.blur.is_none() {
				let blur = blur_manager.create(&state.surface, &state.globals.qh, ());
				state.blur = Some(blur);
			}
			state.blur.as_ref().unwrap().commit();
		} else {
			// It probably doesn't hurt to clear the blur for opaque windows
			blur_manager.unset(&state.surface);
			if let Some(b) = state.blur.take() {
				b.release()
			}
		}
	}

	region.destroy();
}

pub(crate) trait WindowDecorationsExt {
	fn to_xdg(self) -> zxdg_toplevel_decoration_v1::Mode;
}

impl WindowDecorationsExt for WindowDecorations {
	fn to_xdg(self) -> zxdg_toplevel_decoration_v1::Mode {
		match self {
			WindowDecorations::Client => zxdg_toplevel_decoration_v1::Mode::ClientSide,
			WindowDecorations::Server => zxdg_toplevel_decoration_v1::Mode::ServerSide,
		}
	}
}

pub(crate) trait ResizeEdgeWaylandExt {
	fn to_xdg(self) -> xdg_toplevel::ResizeEdge;
}

impl ResizeEdgeWaylandExt for ResizeEdge {
	fn to_xdg(self) -> xdg_toplevel::ResizeEdge {
		match self {
			ResizeEdge::Top => xdg_toplevel::ResizeEdge::Top,
			ResizeEdge::TopRight => xdg_toplevel::ResizeEdge::TopRight,
			ResizeEdge::Right => xdg_toplevel::ResizeEdge::Right,
			ResizeEdge::BottomRight => xdg_toplevel::ResizeEdge::BottomRight,
			ResizeEdge::Bottom => xdg_toplevel::ResizeEdge::Bottom,
			ResizeEdge::BottomLeft => xdg_toplevel::ResizeEdge::BottomLeft,
			ResizeEdge::Left => xdg_toplevel::ResizeEdge::Left,
			ResizeEdge::TopLeft => xdg_toplevel::ResizeEdge::TopLeft,
		}
	}
}

/// The configuration event is in terms of the window geometry, which we are constantly
/// updating to account for the client decorations. But that's not the area we want to render
/// to, due to our intrusize CSD. So, here we calculate the 'actual' size, by adding back in the insets
fn compute_outer_size(
	inset: Pixels,
	new_size: Option<Size<Pixels>>,
	tiling: Tiling,
) -> Option<Size<Pixels>> {
	new_size.map(|mut new_size| {
		if !tiling.top {
			new_size.height += inset;
		}
		if !tiling.bottom {
			new_size.height += inset;
		}
		if !tiling.left {
			new_size.width += inset;
		}
		if !tiling.right {
			new_size.width += inset;
		}

		new_size
	})
}

fn inset_by_tiling(mut bounds: Bounds<Pixels>, inset: Pixels, tiling: Tiling) -> Bounds<Pixels> {
	if !tiling.top {
		bounds.origin.y += inset;
		bounds.size.height -= inset;
	}
	if !tiling.bottom {
		bounds.size.height -= inset;
	}
	if !tiling.left {
		bounds.origin.x += inset;
		bounds.size.width -= inset;
	}
	if !tiling.right {
		bounds.size.width -= inset;
	}

	bounds
}