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

use glib::subclass::prelude::*;

use glib::translate::*;
use glib::Cast;

use super::window::WindowImpl;
use crate::Plug;
use crate::Window;

pub trait PlugImpl: PlugImplExt + WindowImpl {
    fn embedded(&self, plug: &Self::Type) {
        self.parent_embedded(plug)
    }
}

pub trait PlugImplExt: ObjectSubclass {
    fn parent_embedded(&self, plug: &Self::Type);
}

impl<T: PlugImpl> PlugImplExt for T {
    fn parent_embedded(&self, plug: &Self::Type) {
        unsafe {
            let data = T::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkPlugClass;
            if let Some(f) = (*parent_class).embedded {
                f(plug.unsafe_cast_ref::<Plug>().to_glib_none().0)
            }
        }
    }
}

unsafe impl<T: PlugImpl> IsSubclassable<T> for Plug {
    fn class_init(class: &mut ::glib::Class<Self>) {
        <Window as IsSubclassable<T>>::class_init(class);

        let klass = class.as_mut();
        klass.embedded = Some(plug_embedded::<T>);
    }

    fn instance_init(instance: &mut glib::subclass::InitializingObject<T>) {
        <Window as IsSubclassable<T>>::instance_init(instance);
    }
}

unsafe extern "C" fn plug_embedded<T: PlugImpl>(ptr: *mut ffi::GtkPlug) {
    let instance = &*(ptr as *mut T::Instance);
    let imp = instance.impl_();
    let wrap: Borrowed<Plug> = from_glib_borrow(ptr);

    imp.embedded(wrap.unsafe_cast_ref())
}