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use std::os::raw::{c_char, c_int, c_void};

include!(concat!(env!("OUT_DIR"), "/fbs.rs"));

#[repr(transparent)]
#[derive(Copy, Clone)]
pub struct UvAsyncT(pub *const c_void);

unsafe impl Send for UvAsyncT {}

#[repr(transparent)]
pub struct ChannelReadCtx(pub *const c_void);
pub type ChannelReadFreeFn = Option<
    unsafe extern "C" fn(
        /* message: */ *mut u8,
        /* message_len: */ u32,
        /* message_ctx: */ usize,
    ),
>;
pub type ChannelReadFn = unsafe extern "C" fn(
    /* message: */ *mut *mut u8,
    /* message_len: */ *mut u32,
    /* message_ctx: */ *mut usize,
    // This is `uv_async_t` handle that can be called later with `uv_async_send()` when there is
    // more data to read
    /* handle */
    UvAsyncT,
    /* ctx: */ ChannelReadCtx,
) -> ChannelReadFreeFn;

unsafe impl Send for ChannelReadCtx {}

#[repr(transparent)]
pub struct ChannelWriteCtx(pub *const c_void);
pub type ChannelWriteFn = unsafe extern "C" fn(
    /* message: */ *const u8,
    /* message_len: */ u32,
    /* ctx: */ ChannelWriteCtx,
);

unsafe impl Send for ChannelWriteCtx {}

#[link(name = "mediasoup-worker", kind = "static")]
extern "C" {
    /// Returns `0` on success, or an error code `< 0` on failure
    pub fn uv_async_send(handle: UvAsyncT) -> c_int;

    pub fn mediasoup_worker_run(
        argc: c_int,
        argv: *const *const c_char,
        version: *const c_char,
        consumer_channel_fd: c_int,
        producer_channel_fd: c_int,
        channel_read_fn: ChannelReadFn,
        channel_read_ctx: ChannelReadCtx,
        channel_write_fn: ChannelWriteFn,
        channel_write_ctx: ChannelWriteCtx,
    ) -> c_int;
}