//! # X11

use crate::event_loop::{ActiveEventLoop, EventLoopBuilder};
use crate::monitor::MonitorHandle;
use crate::window::{Window, WindowAttributes};

use crate::dpi::Size;

/// X window type. Maps directly to
/// [`_NET_WM_WINDOW_TYPE`](https://specifications.freedesktop.org/wm-spec/wm-spec-1.5.html).
#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, Hash)]
pub enum WindowType {
    /// A desktop feature. This can include a single window containing desktop icons with the same
    /// dimensions as the screen, allowing the desktop environment to have full control of the
    /// desktop, without the need for proxying root window clicks.
    Desktop,
    /// A dock or panel feature. Typically a Window Manager would keep such windows on top of all
    /// other windows.
    Dock,
    /// Toolbar windows. "Torn off" from the main application.
    Toolbar,
    /// Pinnable menu windows. "Torn off" from the main application.
    Menu,
    /// A small persistent utility window, such as a palette or toolbox.
    Utility,
    /// The window is a splash screen displayed as an application is starting up.
    Splash,
    /// This is a dialog window.
    Dialog,
    /// A dropdown menu that usually appears when the user clicks on an item in a menu bar.
    /// This property is typically used on override-redirect windows.
    DropdownMenu,
    /// A popup menu that usually appears when the user right clicks on an object.
    /// This property is typically used on override-redirect windows.
    PopupMenu,
    /// A tooltip window. Usually used to show additional information when hovering over an object
    /// with the cursor. This property is typically used on override-redirect windows.
    Tooltip,
    /// The window is a notification.
    /// This property is typically used on override-redirect windows.
    Notification,
    /// This should be used on the windows that are popped up by combo boxes.
    /// This property is typically used on override-redirect windows.
    Combo,
    /// This indicates the window is being dragged.
    /// This property is typically used on override-redirect windows.
    Dnd,
    /// This is a normal, top-level window.
    #[default]
    Normal,
}

/// The first argument in the provided hook will be the pointer to `XDisplay`
/// and the second one the pointer to [`XErrorEvent`]. The returned `bool` is an
/// indicator whether the error was handled by the callback.
///
/// [`XErrorEvent`]: https://linux.die.net/man/3/xerrorevent
pub type XlibErrorHook =
    Box<dyn Fn(*mut std::ffi::c_void, *mut std::ffi::c_void) -> bool + Send + Sync>;

/// A unique identifier for an X11 visual.
pub type XVisualID = u32;

/// A unique identifier for an X11 window.
pub type XWindow = u32;

/// Hook to winit's xlib error handling callback.
///
/// This method is provided as a safe way to handle the errors coming from X11
/// when using xlib in external crates, like glutin for GLX access. Trying to
/// handle errors by speculating with `XSetErrorHandler` is [`unsafe`].
///
/// **Be aware that your hook is always invoked and returning `true` from it will
/// prevent `winit` from getting the error itself. It's wise to always return
/// `false` if you're not initiated the `Sync`.**
///
/// [`unsafe`]: https://www.remlab.net/op/xlib.shtml
#[inline]
pub fn register_xlib_error_hook(hook: XlibErrorHook) {
    // Append new hook.
    unsafe {
        crate::platform_impl::XLIB_ERROR_HOOKS
            .lock()
            .unwrap()
            .push(hook);
    }
}

/// Additional methods on [`ActiveEventLoop`] that are specific to X11.
pub trait ActiveEventLoopExtX11 {
    /// True if the [`ActiveEventLoop`] uses X11.
    fn is_x11(&self) -> bool;
}

impl ActiveEventLoopExtX11 for ActiveEventLoop {
    #[inline]
    fn is_x11(&self) -> bool {
        !self.p.is_wayland()
    }
}

/// Additional methods on [`EventLoopBuilder`] that are specific to X11.
pub trait EventLoopBuilderExtX11 {
    /// Force using X11.
    fn with_x11(&mut self) -> &mut Self;

    /// Whether to allow the event loop to be created off of the main thread.
    ///
    /// By default, the window is only allowed to be created on the main
    /// thread, to make platform compatibility easier.
    fn with_any_thread(&mut self, any_thread: bool) -> &mut Self;
}

impl<T> EventLoopBuilderExtX11 for EventLoopBuilder<T> {
    #[inline]
    fn with_x11(&mut self) -> &mut Self {
        self.platform_specific.forced_backend = Some(crate::platform_impl::Backend::X);
        self
    }

    #[inline]
    fn with_any_thread(&mut self, any_thread: bool) -> &mut Self {
        self.platform_specific.any_thread = any_thread;
        self
    }
}

/// Additional methods on [`Window`] that are specific to X11.
pub trait WindowExtX11 {}

impl WindowExtX11 for Window {}

/// Additional methods on [`WindowAttributes`] that are specific to X11.
pub trait WindowAttributesExtX11 {
    /// Create this window with a specific X11 visual.
    fn with_x11_visual(self, visual_id: XVisualID) -> Self;

    fn with_x11_screen(self, screen_id: i32) -> Self;

    /// Build window with the given `general` and `instance` names.
    ///
    /// The `general` sets general class of `WM_CLASS(STRING)`, while `instance` set the
    /// instance part of it. The resulted property looks like `WM_CLASS(STRING) = "instance",
    /// "general"`.
    ///
    /// For details about application ID conventions, see the
    /// [Desktop Entry Spec](https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#desktop-file-id)
    fn with_name(self, general: impl Into<String>, instance: impl Into<String>) -> Self;

    /// Build window with override-redirect flag; defaults to false.
    fn with_override_redirect(self, override_redirect: bool) -> Self;

    /// Build window with `_NET_WM_WINDOW_TYPE` hints; defaults to `Normal`.
    fn with_x11_window_type(self, x11_window_type: Vec<WindowType>) -> Self;

    /// Build window with base size hint.
    ///
    /// ```
    /// # use rio_window::dpi::{LogicalSize, PhysicalSize};
    /// # use rio_window::window::Window;
    /// # use rio_window::platform::x11::WindowAttributesExtX11;
    /// // Specify the size in logical dimensions like this:
    /// Window::default_attributes().with_base_size(LogicalSize::new(400.0, 200.0));
    ///
    /// // Or specify the size in physical dimensions like this:
    /// Window::default_attributes().with_base_size(PhysicalSize::new(400, 200));
    /// ```
    fn with_base_size<S: Into<Size>>(self, base_size: S) -> Self;

    /// Embed this window into another parent window.
    ///
    /// # Example
    ///
    /// ```no_run
    /// use rio_window::window::Window;
    /// use rio_window::event_loop::ActiveEventLoop;
    /// use rio_window::platform::x11::{XWindow, WindowAttributesExtX11};
    /// # fn create_window(event_loop: &ActiveEventLoop) -> Result<(), Box<dyn std::error::Error>> {
    /// let parent_window_id = std::env::args().nth(1).unwrap().parse::<XWindow>()?;
    /// let window_attributes = Window::default_attributes().with_embed_parent_window(parent_window_id);
    /// let window = event_loop.create_window(window_attributes)?;
    /// # Ok(()) }
    /// ```
    fn with_embed_parent_window(self, parent_window_id: XWindow) -> Self;
}

impl WindowAttributesExtX11 for WindowAttributes {
    #[inline]
    fn with_x11_visual(mut self, visual_id: XVisualID) -> Self {
        self.platform_specific.x11.visual_id = Some(visual_id);
        self
    }

    #[inline]
    fn with_x11_screen(mut self, screen_id: i32) -> Self {
        self.platform_specific.x11.screen_id = Some(screen_id);
        self
    }

    #[inline]
    fn with_name(
        mut self,
        general: impl Into<String>,
        instance: impl Into<String>,
    ) -> Self {
        self.platform_specific.name = Some(crate::platform_impl::ApplicationName::new(
            general.into(),
            instance.into(),
        ));
        self
    }

    #[inline]
    fn with_override_redirect(mut self, override_redirect: bool) -> Self {
        self.platform_specific.x11.override_redirect = override_redirect;
        self
    }

    #[inline]
    fn with_x11_window_type(mut self, x11_window_types: Vec<WindowType>) -> Self {
        self.platform_specific.x11.x11_window_types = x11_window_types;
        self
    }

    #[inline]
    fn with_base_size<S: Into<Size>>(mut self, base_size: S) -> Self {
        self.platform_specific.x11.base_size = Some(base_size.into());
        self
    }

    #[inline]
    fn with_embed_parent_window(mut self, parent_window_id: XWindow) -> Self {
        self.platform_specific.x11.embed_window = Some(parent_window_id);
        self
    }
}

/// Additional methods on `MonitorHandle` that are specific to X11.
pub trait MonitorHandleExtX11 {
    /// Returns the inner identifier of the monitor.
    fn native_id(&self) -> u32;
}

impl MonitorHandleExtX11 for MonitorHandle {
    #[inline]
    fn native_id(&self) -> u32 {
        self.inner.native_identifier()
    }
}
