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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::prelude::*;
use crate::subclass::prelude::*;
use crate::Widget;

use glib::object::{Cast, IsA, WeakRef};
use glib::translate::*;
use glib::Continue;

pub trait WidgetExtManual: 'static {
    /// Queues an animation frame update and adds a callback to be called
    /// before each frame.
    ///
    /// Until the tick callback is removed, it will be called frequently
    /// (usually at the frame rate of the output device or as quickly as
    /// the application can be repainted, whichever is slower). For this
    /// reason, is most suitable for handling graphics that change every
    /// frame or every few frames. The tick callback does not automatically
    /// imply a relayout or repaint. If you want a repaint or relayout, and
    /// aren’t changing widget properties that would trigger that (for example,
    /// changing the text of a [`Label`][crate::Label]), then you will have to call
    /// [``WidgetExt::queue_resize()``][crate::prelude::`WidgetExt::queue_resize()`] or [``WidgetExt::queue_draw()``][crate::prelude::`WidgetExt::queue_draw()`]
    /// yourself.
    ///
    /// [``FrameClock::frame_time()``][crate::gdk::`FrameClock::frame_time()`] should generally be used
    /// for timing continuous animations and
    /// `Gdk::`FrameTimings::get_predicted_presentation_time()`` if you are
    /// trying to display isolated frames at particular times.
    ///
    /// This is a more convenient alternative to connecting directly to the
    /// `signal::gdk::FrameClock::update` signal of [`gdk::FrameClock`][crate::gdk::FrameClock], since you
    /// don't have to worry about when a [`gdk::FrameClock`][crate::gdk::FrameClock] is assigned to a widget.
    /// ## `callback`
    /// function to call for updating animations
    ///
    /// # Returns
    ///
    /// an id for the connection of this callback. Remove the callback
    ///  by passing the id returned from this function to
    ///  `Gtk::`Widget::remove_tick_callback()``
    #[doc(alias = "gtk_widget_add_tick_callback")]
    fn add_tick_callback<P: Fn(&Self, &gdk::FrameClock) -> Continue + 'static>(
        &self,
        callback: P,
    ) -> TickCallbackId;
}

impl<O: IsA<Widget>> WidgetExtManual for O {
    fn add_tick_callback<P: Fn(&Self, &gdk::FrameClock) -> Continue + 'static>(
        &self,
        callback: P,
    ) -> TickCallbackId {
        let callback_data: Box<P> = Box::new(callback);

        unsafe extern "C" fn callback_func<
            O: IsA<Widget>,
            P: Fn(&O, &gdk::FrameClock) -> Continue + 'static,
        >(
            widget: *mut ffi::GtkWidget,
            frame_clock: *mut gdk::ffi::GdkFrameClock,
            user_data: glib::ffi::gpointer,
        ) -> glib::ffi::gboolean {
            let widget: Borrowed<Widget> = from_glib_borrow(widget);
            let frame_clock = from_glib_borrow(frame_clock);
            let callback: &P = &*(user_data as *mut _);
            let res = (*callback)(widget.unsafe_cast_ref(), &frame_clock);
            res.into_glib()
        }
        let callback = Some(callback_func::<Self, P> as _);

        unsafe extern "C" fn notify_func<
            O: IsA<Widget>,
            P: Fn(&O, &gdk::FrameClock) -> Continue + 'static,
        >(
            data: glib::ffi::gpointer,
        ) {
            let _callback: Box<P> = Box::from_raw(data as *mut _);
        }
        let destroy_call = Some(notify_func::<Self, P> as _);

        let id = unsafe {
            ffi::gtk_widget_add_tick_callback(
                self.as_ref().to_glib_none().0,
                callback,
                Box::into_raw(callback_data) as *mut _,
                destroy_call,
            )
        };
        TickCallbackId {
            id,
            widget: self.upcast_ref().downgrade(),
        }
    }
}

#[derive(Debug)]
pub struct TickCallbackId {
    id: u32,
    widget: WeakRef<Widget>,
}

impl PartialEq for TickCallbackId {
    fn eq(&self, other: &Self) -> bool {
        self.id == other.id
    }
}

impl TickCallbackId {
    #[doc(alias = "gtk_widget_remove_tick_callback")]
    #[doc(alias = "remove_tick_callback")]
    pub fn remove(self) {
        if let Some(widget) = self.widget.upgrade() {
            unsafe {
                ffi::gtk_widget_remove_tick_callback(widget.to_glib_none().0, self.id);
            }
        }
    }
}

pub trait InitializingWidgetExt {
    fn init_template(&self);
}

impl<T: WidgetImpl> InitializingWidgetExt for glib::subclass::InitializingObject<T> {
    fn init_template(&self) {
        unsafe {
            self.as_ref().unsafe_cast_ref::<Widget>().init_template();
        }
    }
}