clepsydre-rebind 0.1.0

Safe bindings for libclepsydre
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// rustdoc-stripper-ignore-next
//! Traits intended for subclassing [`Collection`].

use std::{ffi::c_char, ptr};

use ffi::{ClepsydreCalendar, ClepsydreCollection};
use gio::ffi::{
    GAsyncReadyCallback, GAsyncResult, GCancellable, g_task_new, g_task_propagate_pointer,
    g_task_return_error, g_task_return_pointer,
};
use glib::{
    ffi::{GError, gpointer},
    gobject_ffi::{GObject, g_object_unref},
    prelude::*,
    subclass::prelude::*,
    translate::*,
};

use crate::{Calendar, Collection, PinnedFutureResult, Result};

pub trait CollectionImpl: ObjectImpl + ObjectSubclass<Type: IsA<Collection>> {
    fn try_create_calendar(&self, answer: &str) -> Result<Calendar> {
        self.parent_try_create_calendar(answer)
    }

    fn try_create_calendar_future(&self, answer: String) -> PinnedFutureResult<Calendar> {
        self.parent_try_create_calendar_future(answer)
    }
}

pub trait CollectionImplExt: CollectionImpl {
    fn parent_try_create_calendar(&self, answer: &str) -> Result<Calendar> {
        unsafe {
            let data = Self::type_data();
            let parent_class = data.as_ref().parent_class() as *mut ffi::ClepsydreCollectionClass;
            if let Some(f) = (*parent_class).try_create_calendar {
                let mut error = ptr::null_mut();
                let result = f(
                    self.obj().unsafe_cast_ref::<Collection>().to_glib_none().0,
                    answer.to_glib_none().0,
                    &mut error,
                );
                if error.is_null() {
                    Ok(from_glib_full(result))
                } else {
                    Err(from_glib_full(error))
                }
            } else {
                unimplemented!()
            }
        }
    }

    fn parent_try_create_calendar_future(&self, _answer: String) -> PinnedFutureResult<Calendar> {
        unimplemented!()
    }
}

impl<T: CollectionImpl> CollectionImplExt for T {}

unsafe impl<T: CollectionImpl> IsSubclassable<T> for Collection {
    fn class_init(class: &mut ::glib::Class<Self>) {
        Self::parent_class_init::<T>(class);

        let klass = class.as_mut();
        klass.try_create_calendar = Some(manager_try_create_calendar::<T>);
        klass.try_create_calendar_async = Some(manager_try_create_calendar_async::<T>);
        klass.try_create_calendar_finish = Some(manager_try_create_calendar_finish);
    }
}

unsafe extern "C" fn manager_try_create_calendar<T: CollectionImpl>(
    collection_ptr: *mut ClepsydreCollection,
    answer_ptr: *const c_char,
    error_ptr: *mut *mut GError,
) -> *mut ClepsydreCalendar {
    unsafe {
        let instance = &*(collection_ptr as *mut T::Instance);
        let imp = instance.imp();
        let answer = glib::GStr::from_ptr(answer_ptr).as_str();

        match imp.try_create_calendar(answer) {
            Ok(calendar) => calendar.to_glib_full(),
            Err(error) => {
                if !error_ptr.is_null() {
                    *error_ptr = error.into_glib_ptr();
                }
                ptr::null_mut()
            }
        }
    }
}

unsafe extern "C" fn manager_try_create_calendar_async<T: CollectionImpl>(
    collection_ptr: *mut ClepsydreCollection,
    answer_ptr: *const c_char,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer,
) {
    unsafe {
        let task = g_task_new(collection_ptr as *mut _, cancellable, callback, user_data);

        let instance = &*(collection_ptr as *mut T::Instance);
        let imp = instance.imp();
        let answer = glib::GStr::from_ptr(answer_ptr).to_string();

        let future = imp.try_create_calendar_future(answer);

        glib::MainContext::ref_thread_default().spawn_local(async move {
            match future.await {
                Ok(calendar) => {
                    let calendar_ptr: *mut ClepsydreCalendar = calendar.to_glib_full();

                    g_task_return_pointer(
                        task,
                        calendar_ptr as gpointer,
                        Some(std::mem::transmute::<
                            unsafe extern "C" fn(*mut GObject),
                            unsafe extern "C" fn(gpointer),
                        >(g_object_unref)),
                    );
                }
                Err(error) => g_task_return_error(task, error.into_glib_ptr()),
            }
            g_object_unref(task as *mut _);
        });
    }
}

unsafe extern "C" fn manager_try_create_calendar_finish(
    _collection_ptr: *mut ClepsydreCollection,
    async_result: *mut GAsyncResult,
    error_ptr: *mut *mut GError,
) -> *mut ClepsydreCalendar {
    unsafe { g_task_propagate_pointer(async_result as *mut _, error_ptr) as *mut _ }
}

#[allow(clippy::missing_safety_doc)]
pub unsafe trait CollectionClassExt: ClassStruct {}

unsafe impl<T: ClassStruct> CollectionClassExt for T where T::Type: CollectionImpl {}