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#![cfg(target_os = "windows")]

use std::os::raw::c_void;

use libc;
use winapi::shared::windef::HWND;

use crate::{
    event::DeviceId,
    event_loop::EventLoop,
    monitor::MonitorHandle,
    platform_impl::EventLoop as WindowsEventLoop,
    window::{Icon, Window, WindowBuilder},
};

/// Additional methods on `EventLoop` that are specific to Windows.
pub trait EventLoopExtWindows {
    /// Creates an event loop off of the main thread.
    ///
    /// # `Window` caveats
    ///
    /// Note that any `Window` created on the new thread will be destroyed when the thread
    /// terminates. Attempting to use a `Window` after its parent thread terminates has
    /// unspecified, although explicitly not undefined, behavior.
    fn new_any_thread() -> Self
    where
        Self: Sized;

    /// By default, winit on Windows will attempt to enable process-wide DPI awareness. If that's
    /// undesirable, you can create an `EventLoop` using this function instead.
    fn new_dpi_unaware() -> Self
    where
        Self: Sized;

    /// Creates a DPI-unaware event loop off of the main thread.
    ///
    /// The `Window` caveats in [`new_any_thread`](EventLoopExtWindows::new_any_thread) also apply here.
    fn new_dpi_unaware_any_thread() -> Self
    where
        Self: Sized;
}

impl<T> EventLoopExtWindows for EventLoop<T> {
    #[inline]
    fn new_any_thread() -> Self {
        EventLoop {
            event_loop: WindowsEventLoop::new_any_thread(),
            _marker: ::std::marker::PhantomData,
        }
    }

    #[inline]
    fn new_dpi_unaware() -> Self {
        EventLoop {
            event_loop: WindowsEventLoop::new_dpi_unaware(),
            _marker: ::std::marker::PhantomData,
        }
    }

    #[inline]
    fn new_dpi_unaware_any_thread() -> Self {
        EventLoop {
            event_loop: WindowsEventLoop::new_dpi_unaware_any_thread(),
            _marker: ::std::marker::PhantomData,
        }
    }
}

/// Additional methods on `Window` that are specific to Windows.
pub trait WindowExtWindows {
    /// Returns the HINSTANCE of the window
    fn hinstance(&self) -> *mut libc::c_void;
    /// Returns the native handle that is used by this window.
    ///
    /// The pointer will become invalid when the native window was destroyed.
    fn hwnd(&self) -> *mut libc::c_void;

    /// This sets `ICON_BIG`. A good ceiling here is 256x256.
    fn set_taskbar_icon(&self, taskbar_icon: Option<Icon>);

    /// Whether the system theme is currently Windows 10's "Dark Mode".
    fn is_dark_mode(&self) -> bool;
}

impl WindowExtWindows for Window {
    #[inline]
    fn hinstance(&self) -> *mut libc::c_void {
        self.window.hinstance() as *mut _
    }

    #[inline]
    fn hwnd(&self) -> *mut libc::c_void {
        self.window.hwnd() as *mut _
    }

    #[inline]
    fn set_taskbar_icon(&self, taskbar_icon: Option<Icon>) {
        self.window.set_taskbar_icon(taskbar_icon)
    }

    #[inline]
    fn is_dark_mode(&self) -> bool {
        self.window.is_dark_mode()
    }
}

/// Additional methods on `WindowBuilder` that are specific to Windows.
pub trait WindowBuilderExtWindows {
    /// Sets a parent to the window to be created.
    fn with_parent_window(self, parent: HWND) -> WindowBuilder;

    /// This sets `ICON_BIG`. A good ceiling here is 256x256.
    fn with_taskbar_icon(self, taskbar_icon: Option<Icon>) -> WindowBuilder;

    /// This sets `WS_EX_NOREDIRECTIONBITMAP`.
    fn with_no_redirection_bitmap(self, flag: bool) -> WindowBuilder;
}

impl WindowBuilderExtWindows for WindowBuilder {
    #[inline]
    fn with_parent_window(mut self, parent: HWND) -> WindowBuilder {
        self.platform_specific.parent = Some(parent);
        self
    }

    #[inline]
    fn with_taskbar_icon(mut self, taskbar_icon: Option<Icon>) -> WindowBuilder {
        self.platform_specific.taskbar_icon = taskbar_icon;
        self
    }

    #[inline]
    fn with_no_redirection_bitmap(mut self, flag: bool) -> WindowBuilder {
        self.platform_specific.no_redirection_bitmap = flag;
        self
    }
}

/// Additional methods on `MonitorHandle` that are specific to Windows.
pub trait MonitorHandleExtWindows {
    /// Returns the name of the monitor adapter specific to the Win32 API.
    fn native_id(&self) -> String;

    /// Returns the handle of the monitor - `HMONITOR`.
    fn hmonitor(&self) -> *mut c_void;
}

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

    #[inline]
    fn hmonitor(&self) -> *mut c_void {
        self.inner.hmonitor() as *mut _
    }
}

/// Additional methods on `DeviceId` that are specific to Windows.
pub trait DeviceIdExtWindows {
    /// Returns an identifier that persistently refers to this specific device.
    ///
    /// Will return `None` if the device is no longer available.
    fn persistent_identifier(&self) -> Option<String>;
}

impl DeviceIdExtWindows for DeviceId {
    #[inline]
    fn persistent_identifier(&self) -> Option<String> {
        self.0.persistent_identifier()
    }
}