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use gio_sys;
use glib::object::IsA;
use glib::translate::*;
use glib::GString;
use glib_sys;
use gobject_sys;
use libc::c_char;
use std::pin::Pin;
use std::ptr;
use Cancellable;
use Subprocess;

impl Subprocess {
    /// Asynchronous version of `Subprocess::communicate_utf8`. Complete
    /// invocation with `Subprocess::communicate_utf8_finish`.
    /// ## `stdin_buf`
    /// Input data, or `None`
    /// ## `cancellable`
    /// Cancellable
    /// ## `callback`
    /// Callback
    /// ## `user_data`
    /// User data
    pub fn communicate_utf8_async<
        R: FnOnce(Result<(GString, GString), glib::Error>) + Send + 'static,
        C: IsA<Cancellable>,
    >(
        &self,
        stdin_buf: Option<String>,
        cancellable: Option<&C>,
        callback: R,
    ) {
        let stdin_buf = stdin_buf.to_glib_full();
        let cancellable = cancellable.map(|c| c.as_ref());
        let gcancellable = cancellable.to_glib_none();
        let user_data: Box<(R, *mut c_char)> = Box::new((callback, stdin_buf));
        unsafe extern "C" fn communicate_utf8_async_trampoline<
            R: FnOnce(Result<(GString, GString), glib::Error>) + Send + 'static,
        >(
            _source_object: *mut gobject_sys::GObject,
            res: *mut gio_sys::GAsyncResult,
            user_data: glib_sys::gpointer,
        ) {
            let mut error = ptr::null_mut();
            let mut stdout_buf = ptr::null_mut();
            let mut stderr_buf = ptr::null_mut();
            let _ = gio_sys::g_subprocess_communicate_utf8_finish(
                _source_object as *mut _,
                res,
                &mut stdout_buf,
                &mut stderr_buf,
                &mut error,
            );
            let result = if error.is_null() {
                Ok((from_glib_full(stdout_buf), from_glib_full(stderr_buf)))
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box<(R, *mut c_char)> = Box::from_raw(user_data as *mut _);
            glib_sys::g_free(callback.1 as *mut _);
            callback.0(result);
        }
        unsafe {
            gio_sys::g_subprocess_communicate_utf8_async(
                self.to_glib_none().0,
                stdin_buf,
                gcancellable.0,
                Some(communicate_utf8_async_trampoline::<R>),
                Box::into_raw(user_data) as *mut _,
            );
        }
    }

    pub fn communicate_utf8_async_future(
        &self,
        stdin_buf: Option<String>,
    ) -> Pin<Box<dyn std::future::Future<Output = Result<(GString, GString), glib::Error>> + 'static>>
    {
        Box::pin(crate::GioFuture::new(self, move |obj, send| {
            let cancellable = Cancellable::new();
            obj.communicate_utf8_async(stdin_buf, Some(&cancellable), move |res| {
                send.resolve(res);
            });

            cancellable
        }))
    }
}