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//! The async operations.
//! Types in this mod represents the low-level operations passed to kernel.
//! The operation itself doesn't perform anything.
//! You need to pass them to [`crate::Proactor`], and poll the driver.

use compio_buf::{BufResult, IntoInner, IoBuf, IoBufMut, SetBufInit};
use socket2::SockAddr;

#[cfg(target_os = "windows")]
pub use crate::sys::op::ConnectNamedPipe;
pub use crate::sys::op::{
    Accept, Recv, RecvFrom, RecvFromVectored, RecvVectored, Send, SendTo, SendToVectored,
    SendVectored,
};
use crate::{sockaddr_storage, socklen_t, RawFd};

/// Trait to update the buffer length inside the [`BufResult`].
pub trait BufResultExt {
    /// Call [`SetBufInit::set_buf_init`] if the result is [`Ok`].
    fn map_advanced(self) -> Self;
}

impl<T: SetBufInit> BufResultExt for BufResult<usize, T> {
    fn map_advanced(self) -> Self {
        self.map_res(|res| (res, ()))
            .map_advanced()
            .map_res(|(res, _)| res)
    }
}

impl<T: SetBufInit, O> BufResultExt for BufResult<(usize, O), T> {
    fn map_advanced(self) -> Self {
        self.map(|(init, obj), mut buffer| {
            unsafe {
                buffer.set_buf_init(init);
            }
            ((init, obj), buffer)
        })
    }
}

/// Helper trait for [`RecvFrom`] and [`RecvFromVectored`].
pub trait RecvResultExt {
    /// The mapped result.
    type RecvFromResult;

    /// Create [`SockAddr`] if the result is [`Ok`].
    fn map_addr(self) -> Self::RecvFromResult;
}

impl<T> RecvResultExt for BufResult<usize, (T, sockaddr_storage, socklen_t)> {
    type RecvFromResult = BufResult<(usize, SockAddr), T>;

    fn map_addr(self) -> Self::RecvFromResult {
        self.map2(
            |res, (buffer, addr_buffer, addr_size)| {
                let addr = unsafe { SockAddr::new(addr_buffer, addr_size) };
                ((res, addr), buffer)
            },
            |(buffer, ..)| buffer,
        )
    }
}

/// Read a file at specified position into specified buffer.
#[derive(Debug)]
pub struct ReadAt<T: IoBufMut> {
    pub(crate) fd: RawFd,
    pub(crate) offset: usize,
    pub(crate) buffer: T,
}

impl<T: IoBufMut> ReadAt<T> {
    /// Create [`ReadAt`].
    pub fn new(fd: RawFd, offset: usize, buffer: T) -> Self {
        Self { fd, offset, buffer }
    }
}

impl<T: IoBufMut> IntoInner for ReadAt<T> {
    type Inner = T;

    fn into_inner(self) -> Self::Inner {
        self.buffer
    }
}

/// Write a file at specified position from specified buffer.
#[derive(Debug)]
pub struct WriteAt<T: IoBuf> {
    pub(crate) fd: RawFd,
    pub(crate) offset: usize,
    pub(crate) buffer: T,
}

impl<T: IoBuf> WriteAt<T> {
    /// Create [`WriteAt`].
    pub fn new(fd: RawFd, offset: usize, buffer: T) -> Self {
        Self { fd, offset, buffer }
    }
}

impl<T: IoBuf> IntoInner for WriteAt<T> {
    type Inner = T;

    fn into_inner(self) -> Self::Inner {
        self.buffer
    }
}

/// Sync data to the disk.
pub struct Sync {
    pub(crate) fd: RawFd,
    #[allow(dead_code)]
    pub(crate) datasync: bool,
}

impl Sync {
    /// Create [`Sync`].
    ///
    /// If `datasync` is `true`, the file metadata may not be synchronized.
    ///
    /// ## Platform specific
    ///
    /// * IOCP: it is synchronized operation, and calls `FlushFileBuffers`.
    /// * io-uring: `fdatasync` if `datasync` specified, otherwise `fsync`.
    /// * polling: it is synchronized `fdatasync` or `fsync`.
    pub fn new(fd: RawFd, datasync: bool) -> Self {
        Self { fd, datasync }
    }
}

/// Connect to a remote address.
pub struct Connect {
    pub(crate) fd: RawFd,
    pub(crate) addr: SockAddr,
}

impl Connect {
    /// Create [`Connect`]. `fd` should be bound.
    pub fn new(fd: RawFd, addr: SockAddr) -> Self {
        Self { fd, addr }
    }
}