// 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, FileInfo, IOStream, Seekable};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, fmt, pin::Pin, ptr};

glib::wrapper! {
    /// GFileIOStream provides io streams that both read and write to the same
    /// file handle.
    ///
    /// GFileIOStream implements [`Seekable`][crate::Seekable], which allows the io
    /// stream to jump to arbitrary positions in the file and to truncate
    /// the file, provided the filesystem of the file supports these
    /// operations.
    ///
    /// To find the position of a file io stream, use
    /// [`SeekableExt::tell()`][crate::prelude::SeekableExt::tell()].
    ///
    /// To find out if a file io stream supports seeking, use [`SeekableExt::can_seek()`][crate::prelude::SeekableExt::can_seek()].
    /// To position a file io stream, use [`SeekableExt::seek()`][crate::prelude::SeekableExt::seek()].
    /// To find out if a file io stream supports truncating, use
    /// [`SeekableExt::can_truncate()`][crate::prelude::SeekableExt::can_truncate()]. To truncate a file io
    /// stream, use [`SeekableExt::truncate()`][crate::prelude::SeekableExt::truncate()].
    ///
    /// The default implementation of all the [`FileIOStream`][crate::FileIOStream] operations
    /// and the implementation of [`Seekable`][crate::Seekable] just call into the same operations
    /// on the output stream.
    ///
    /// # Implements
    ///
    /// [`FileIOStreamExt`][trait@crate::prelude::FileIOStreamExt], [`IOStreamExt`][trait@crate::prelude::IOStreamExt], [`trait@glib::ObjectExt`], [`SeekableExt`][trait@crate::prelude::SeekableExt], [`IOStreamExtManual`][trait@crate::prelude::IOStreamExtManual]
    #[doc(alias = "GFileIOStream")]
    pub struct FileIOStream(Object<ffi::GFileIOStream, ffi::GFileIOStreamClass>) @extends IOStream, @implements Seekable;

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

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

/// Trait containing all [`struct@FileIOStream`] methods.
///
/// # Implementors
///
/// [`FileIOStream`][struct@crate::FileIOStream]
pub trait FileIOStreamExt: 'static {
    /// Gets the entity tag for the file when it has been written.
    /// This must be called after the stream has been written
    /// and closed, as the etag can change while writing.
    ///
    /// # Returns
    ///
    /// the entity tag for the stream.
    #[doc(alias = "g_file_io_stream_get_etag")]
    #[doc(alias = "get_etag")]
    fn etag(&self) -> Option<glib::GString>;

    /// Queries a file io stream for the given `attributes`.
    /// This function blocks while querying the stream. For the asynchronous
    /// version of this function, see [`query_info_async()`][Self::query_info_async()].
    /// While the stream is blocked, the stream will set the pending flag
    /// internally, and any other operations on the stream will fail with
    /// [`IOErrorEnum::Pending`][crate::IOErrorEnum::Pending].
    ///
    /// Can fail if the stream was already closed (with `error` being set to
    /// [`IOErrorEnum::Closed`][crate::IOErrorEnum::Closed]), the stream has pending operations (with `error` being
    /// set to [`IOErrorEnum::Pending`][crate::IOErrorEnum::Pending]), or if querying info is not supported for
    /// the stream's interface (with `error` being set to [`IOErrorEnum::NotSupported`][crate::IOErrorEnum::NotSupported]). I
    /// all cases of failure, [`None`] will be returned.
    ///
    /// If `cancellable` is not [`None`], then the operation can be cancelled by
    /// triggering the cancellable object from another thread. If the operation
    /// was cancelled, the error [`IOErrorEnum::Cancelled`][crate::IOErrorEnum::Cancelled] will be set, and [`None`] will
    /// be returned.
    /// ## `attributes`
    /// a file attribute query string.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore.
    ///
    /// # Returns
    ///
    /// a [`FileInfo`][crate::FileInfo] for the `self`, or [`None`] on error.
    #[doc(alias = "g_file_io_stream_query_info")]
    fn query_info(
        &self,
        attributes: &str,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<FileInfo, glib::Error>;

    /// Asynchronously queries the `self` for a [`FileInfo`][crate::FileInfo]. When completed,
    /// `callback` will be called with a [`AsyncResult`][crate::AsyncResult] which can be used to
    /// finish the operation with `g_file_io_stream_query_info_finish()`.
    ///
    /// For the synchronous version of this function, see
    /// [`query_info()`][Self::query_info()].
    /// ## `attributes`
    /// a file attribute query string.
    /// ## `io_priority`
    /// the [I/O priority][gio-GIOScheduler] of the request
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, [`None`] to ignore.
    /// ## `callback`
    /// callback to call when the request is satisfied
    #[doc(alias = "g_file_io_stream_query_info_async")]
    fn query_info_async<P: FnOnce(Result<FileInfo, glib::Error>) + 'static>(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    );

    fn query_info_future(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<FileInfo, glib::Error>> + 'static>>;
}

impl<O: IsA<FileIOStream>> FileIOStreamExt for O {
    fn etag(&self) -> Option<glib::GString> {
        unsafe {
            from_glib_full(ffi::g_file_io_stream_get_etag(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn query_info(
        &self,
        attributes: &str,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<FileInfo, glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let ret = ffi::g_file_io_stream_query_info(
                self.as_ref().to_glib_none().0,
                attributes.to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    fn query_info_async<P: FnOnce(Result<FileInfo, glib::Error>) + 'static>(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
        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 query_info_async_trampoline<
            P: FnOnce(Result<FileInfo, 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 ret =
                ffi::g_file_io_stream_query_info_finish(_source_object as *mut _, res, &mut error);
            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 = query_info_async_trampoline::<P>;
        unsafe {
            ffi::g_file_io_stream_query_info_async(
                self.as_ref().to_glib_none().0,
                attributes.to_glib_none().0,
                io_priority.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn query_info_future(
        &self,
        attributes: &str,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<FileInfo, glib::Error>> + 'static>> {
        let attributes = String::from(attributes);
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.query_info_async(&attributes, io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }
}

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