// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{AsyncResult, Cancellable, Icon, InputStream};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, fmt, pin::Pin, ptr};

glib::wrapper! {
    /// Extends the [`Icon`][crate::Icon] interface and adds the ability to
    /// load icons from streams.
    ///
    /// # Implements
    ///
    /// [`LoadableIconExt`][trait@crate::prelude::LoadableIconExt], [`IconExt`][trait@crate::prelude::IconExt]
    #[doc(alias = "GLoadableIcon")]
    pub struct LoadableIcon(Interface<ffi::GLoadableIcon, ffi::GLoadableIconIface>) @requires Icon;

    match fn {
        type_ => || ffi::g_loadable_icon_get_type(),
    }
}

impl LoadableIcon {
    pub const NONE: Option<&'static LoadableIcon> = None;
}

/// Trait containing all [`struct@LoadableIcon`] methods.
///
/// # Implementors
///
/// [`BytesIcon`][struct@crate::BytesIcon], [`FileIcon`][struct@crate::FileIcon], [`LoadableIcon`][struct@crate::LoadableIcon]
pub trait LoadableIconExt: 'static {
    /// Loads a loadable icon. For the asynchronous version of this function,
    /// see [`load_async()`][Self::load_async()].
    /// ## `size`
    /// an integer.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to
    /// ignore.
    ///
    /// # Returns
    ///
    /// a [`InputStream`][crate::InputStream] to read the icon from.
    ///
    /// ## `type_`
    /// a location to store the type of the loaded
    /// icon, [`None`] to ignore.
    #[doc(alias = "g_loadable_icon_load")]
    fn load(
        &self,
        size: i32,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<(InputStream, glib::GString), glib::Error>;

    /// Loads an icon asynchronously. To finish this function, see
    /// `g_loadable_icon_load_finish()`. For the synchronous, blocking
    /// version of this function, see [`load()`][Self::load()].
    /// ## `size`
    /// an integer.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore.
    /// ## `callback`
    /// a `GAsyncReadyCallback` to call when the
    ///  request is satisfied
    #[doc(alias = "g_loadable_icon_load_async")]
    fn load_async<P: FnOnce(Result<(InputStream, glib::GString), glib::Error>) + 'static>(
        &self,
        size: i32,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    );

    fn load_future(
        &self,
        size: i32,
    ) -> Pin<
        Box_<
            dyn std::future::Future<Output = Result<(InputStream, glib::GString), glib::Error>>
                + 'static,
        >,
    >;
}

impl<O: IsA<LoadableIcon>> LoadableIconExt for O {
    fn load(
        &self,
        size: i32,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<(InputStream, glib::GString), glib::Error> {
        unsafe {
            let mut type_ = ptr::null_mut();
            let mut error = ptr::null_mut();
            let ret = ffi::g_loadable_icon_load(
                self.as_ref().to_glib_none().0,
                size,
                &mut type_,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok((from_glib_full(ret), from_glib_full(type_)))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn load_async<P: FnOnce(Result<(InputStream, glib::GString), glib::Error>) + 'static>(
        &self,
        size: i32,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn load_async_trampoline<
            P: FnOnce(Result<(InputStream, glib::GString), glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = ptr::null_mut();
            let mut type_ = ptr::null_mut();
            let ret = ffi::g_loadable_icon_load_finish(
                _source_object as *mut _,
                res,
                &mut type_,
                &mut error,
            );
            let result = if error.is_null() {
                Ok((from_glib_full(ret), from_glib_full(type_)))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = load_async_trampoline::<P>;
        unsafe {
            ffi::g_loadable_icon_load_async(
                self.as_ref().to_glib_none().0,
                size,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn load_future(
        &self,
        size: i32,
    ) -> Pin<
        Box_<
            dyn std::future::Future<Output = Result<(InputStream, glib::GString), glib::Error>>
                + 'static,
        >,
    > {
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.load_async(size, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }
}

impl fmt::Display for LoadableIcon {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("LoadableIcon")
    }
}