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// Take a look at the license at the top of the repository in the LICENSE file.
use crate::{ffi, UriClipAsset};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, pin::Pin};

impl UriClipAsset {
    /// Creates a [`UriClipAsset`][crate::UriClipAsset] for `uri`
    ///
    /// Example of request of a GESUriClipAsset:
    ///
    /// ```text
    /// // The request callback
    /// static void
    /// filesource_asset_loaded_cb (GESAsset * source, GAsyncResult * res, gpointer user_data)
    /// {
    ///   GError *error = NULL;
    ///   GESUriClipAsset *filesource_asset;
    ///
    ///   filesource_asset = ges_uri_clip_asset_finish (res, &error);
    ///   if (filesource_asset) {
    ///    gst_print ("The file: %s is usable as a FileSource, it is%s an image and lasts %" GST_TIME_FORMAT,
    ///        ges_asset_get_id (GES_ASSET (filesource_asset))
    ///        ges_uri_clip_asset_is_image (filesource_asset) ? "" : " not",
    ///        GST_TIME_ARGS (ges_uri_clip_asset_get_duration (filesource_asset));
    ///   } else {
    ///    gst_print ("The file: %s is *not* usable as a FileSource because: %s",
    ///        ges_asset_get_id (source), error->message);
    ///   }
    ///
    ///   gst_object_unref (mfs);
    /// }
    ///
    /// // The request:
    /// ges_uri_clip_asset_new (uri, (GAsyncReadyCallback) filesource_asset_loaded_cb, user_data);
    /// ```
    /// ## `uri`
    /// The URI of the file for which to create a [`UriClipAsset`][crate::UriClipAsset]
    /// ## `cancellable`
    /// optional `GCancellable` object, [`None`] to ignore.
    /// ## `callback`
    /// a `GAsyncReadyCallback` to call when the initialization is finished
    #[doc(alias = "ges_uri_clip_asset_new")]
    #[allow(clippy::new_ret_no_self)]
    pub fn new<P: FnOnce(Result<UriClipAsset, glib::Error>) + 'static>(
        uri: &str,
        cancellable: Option<&impl IsA<gio::Cancellable>>,
        callback: P,
    ) {
        assert_initialized_main_thread!();

        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 new_trampoline<
            P: FnOnce(Result<UriClipAsset, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut gio::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret = {
                #[cfg(feature = "v1_16")]
                {
                    ffi::ges_uri_clip_asset_finish(res, &mut error)
                }
                #[cfg(not(feature = "v1_16"))]
                {
                    ffi::ges_asset_request_finish(res, &mut error) as *mut ffi::GESUriClipAsset
                }
            };
            let result = if error.is_null() {
                Ok(from_glib_full(ret))
            } 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 = new_trampoline::<P>;
        unsafe {
            ffi::ges_uri_clip_asset_new(
                uri.to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    pub fn new_future(
        uri: &str,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<UriClipAsset, glib::Error>> + 'static>>
    {
        skip_assert_initialized!();
        let uri = String::from(uri);
        Box_::pin(gio::GioFuture::new(&(), move |_obj, cancellable, send| {
            Self::new(&uri, Some(cancellable), move |res| {
                send.resolve(res);
            });
        }))
    }
}