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use std::{cell::RefCell, pin::Pin, ptr};

use glib::translate::{from_glib_full, IntoGlib, ToGlibPtr};

use crate::{prelude::*, FileLoader};

impl FileLoader {
    #[doc(alias = "gtk_source_file_loader_load_async")]
    pub fn load_async_with_callback<
        P: FnMut(i64, i64) + Send + 'static,
        Q: FnOnce(Result<(), glib::Error>) + Send + 'static,
    >(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<gio::Cancellable>>,
        progress_callback: P,
        callback: Q,
    ) {
        self.load_async_impl(
            io_priority,
            cancellable,
            Some(Box::new(progress_callback)),
            callback,
        )
    }

    /// Loads asynchronously the file or input stream contents into the [`Buffer`][crate::Buffer].
    ///
    /// See the `Gio::AsyncResult` documentation to know how to use this
    /// function.
    /// ## `io_priority`
    /// the I/O priority of the request. E.g. `G_PRIORITY_LOW`,
    ///   `G_PRIORITY_DEFAULT` or `G_PRIORITY_HIGH`.
    /// ## `cancellable`
    /// optional #GCancellable object, [`None`] to ignore.
    /// ## `progress_callback`
    /// function to call back with
    ///   progress information, or [`None`] if progress information is not needed.
    /// ## `progress_callback_data`
    /// user data to pass to @progress_callback.
    /// ## `progress_callback_notify`
    /// function to call on
    ///   @progress_callback_data when the @progress_callback is no longer needed, or
    ///   [`None`].
    /// ## `callback`
    /// a #GAsyncReadyCallback to call when the request is
    ///   satisfied.
    #[doc(alias = "gtk_source_file_loader_load_async")]
    pub fn load_async<Q: FnOnce(Result<(), glib::Error>) + Send + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<gio::Cancellable>>,
        callback: Q,
    ) {
        self.load_async_impl(io_priority, cancellable, None, callback)
    }

    fn load_async_impl<Q: FnOnce(Result<(), glib::Error>) + Send + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<gio::Cancellable>>,
        progress_callback: Option<Box<dyn FnMut(i64, i64) + Send>>,
        callback: Q,
    ) {
        let progress_trampoline = if progress_callback.is_some() {
            Some(load_async_progress_trampoline::<Q> as _)
        } else {
            None
        };

        let user_data: Box<(Q, RefCell<Option<Box<dyn FnMut(i64, i64) + Send>>>)> =
            Box::new((callback, RefCell::new(progress_callback)));
        unsafe extern "C" fn load_async_trampoline<
            Q: FnOnce(Result<(), glib::Error>) + Send + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut gio::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = ptr::null_mut();
            ffi::gtk_source_file_loader_load_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box<(Q, RefCell<Option<Box<dyn FnMut(i64, i64) + Send>>>)> =
                Box::from_raw(user_data as *mut _);
            callback.0(result);
        }
        unsafe extern "C" fn load_async_progress_trampoline<
            Q: FnOnce(Result<(), glib::Error>) + Send + 'static,
        >(
            current_num_bytes: i64,
            total_num_bytes: i64,
            user_data: glib::ffi::gpointer,
        ) {
            let callback: &(Q, RefCell<Option<Box<dyn FnMut(i64, i64) + Send>>>) =
                &*(user_data as *const _);
            (callback.1.borrow_mut().as_mut().expect("no closure"))(
                current_num_bytes,
                total_num_bytes,
            );
        }

        let user_data = Box::into_raw(user_data) as *mut _;

        unsafe {
            ffi::gtk_source_file_loader_load_async(
                self.to_glib_none().0,
                io_priority.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                progress_trampoline,
                user_data,
                None,
                Some(load_async_trampoline::<Q>),
                user_data,
            );
        }
    }

    pub fn load_future(
        &self,
        io_priority: glib::Priority,
    ) -> (
        Pin<Box<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>>,
        Pin<Box<dyn futures_core::stream::Stream<Item = (i64, i64)> + 'static>>,
    ) {
        let (sender, receiver) = futures_channel::mpsc::unbounded();

        let fut = Box::pin(gtk::gio::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.load_async_with_callback(
                    io_priority,
                    Some(cancellable),
                    move |current_num_bytes, total_num_bytes| {
                        let _ = sender.unbounded_send((current_num_bytes, total_num_bytes));
                    },
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ));

        (fut, Box::pin(receiver))
    }
}