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

#[cfg(feature = "v2_60")]
use std::boxed::Box as Box_;
#[cfg(feature = "v2_60")]
use std::pin::Pin;
#[cfg(feature = "v2_60")]
use std::ptr;

use glib::prelude::*;
#[cfg(feature = "v2_60")]
use glib::translate::*;

use crate::AppInfo;
#[cfg(feature = "v2_60")]
use crate::AppLaunchContext;
#[cfg(feature = "v2_60")]
use crate::Cancellable;

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::AppInfo>> Sealed for T {}
}

pub trait AppInfoExtManual: sealed::Sealed + IsA<AppInfo> + 'static {
    /// Async version of [`AppInfoExt::launch_uris()`][crate::prelude::AppInfoExt::launch_uris()].
    ///
    /// The `callback` is invoked immediately after the application launch, but it
    /// waits for activation in case of D-Bus–activated applications and also provides
    /// extended error information for sandboxed applications, see notes for
    /// [`AppInfo::launch_default_for_uri_async()`][crate::AppInfo::launch_default_for_uri_async()].
    /// ## `uris`
    /// a `GList` containing URIs to launch.
    /// ## `context`
    /// a [`AppLaunchContext`][crate::AppLaunchContext] or [`None`]
    /// ## `cancellable`
    /// a [`Cancellable`][crate::Cancellable]
    /// ## `callback`
    /// a `GAsyncReadyCallback` to call when the request is done
    #[cfg(feature = "v2_60")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v2_60")))]
    #[doc(alias = "g_app_info_launch_uris_async")]
    fn launch_uris_async<
        P: IsA<AppLaunchContext>,
        Q: IsA<Cancellable>,
        R: FnOnce(Result<(), glib::Error>) + 'static,
    >(
        &self,
        uris: &[&str],
        context: Option<&P>,
        cancellable: Option<&Q>,
        callback: R,
    ) {
        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<R>, *mut *mut libc::c_char)> =
            Box_::new((
                glib::thread_guard::ThreadGuard::new(callback),
                uris.to_glib_full(),
            ));
        unsafe extern "C" fn launch_uris_async_trampoline<
            R: FnOnce(Result<(), glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = ptr::null_mut();
            let _ = ffi::g_app_info_launch_uris_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<(glib::thread_guard::ThreadGuard<R>, *mut *mut libc::c_char)> =
                Box_::from_raw(user_data as *mut _);
            let (callback, uris) = *callback;
            let callback = callback.into_inner();
            callback(result);
            glib::ffi::g_strfreev(uris);
        }
        let callback = launch_uris_async_trampoline::<R>;
        unsafe {
            ffi::g_app_info_launch_uris_async(
                self.as_ref().to_glib_none().0,
                uris.to_glib_none().0,
                context.map(|p| p.as_ref()).to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    #[cfg(feature = "v2_60")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v2_60")))]
    fn launch_uris_future<P: IsA<AppLaunchContext> + Clone + 'static>(
        &self,
        uris: &[&str],
        context: Option<&P>,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>> {
        let uris = uris.iter().copied().map(String::from).collect::<Vec<_>>();
        let context = context.map(ToOwned::to_owned);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                let uris = uris
                    .iter()
                    .map(::std::borrow::Borrow::borrow)
                    .collect::<Vec<_>>();
                obj.launch_uris_async(
                    uris.as_ref(),
                    context.as_ref().map(::std::borrow::Borrow::borrow),
                    Some(cancellable),
                    move |res| {
                        send.resolve(res);
                    },
                );
            },
        ))
    }
}

impl<O: IsA<AppInfo>> AppInfoExtManual for O {}