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use std::time::Duration;

use futures::{Async, Stream};
use futures::executor::{Notify, NotifyHandle, Spawn, spawn};
use futures::sync::mpsc;
use glib_sys;
use glib_sys::{gboolean, gpointer, g_timeout_add_full};
use libc::c_uint;

use utils::millis;

pub struct Interval {
    id: c_uint,
    rx: mpsc::Receiver<()>,
}

impl Interval {
    pub fn new(duration: Duration) -> Self {
        assert_initialized_main_thread!();
        let (tx, rx) = mpsc::channel(0);
        let tx = Box::into_raw(Box::new(spawn(tx)));
        let id = unsafe { g_timeout_add_full(glib_sys::G_PRIORITY_DEFAULT, millis(duration) as u32, Some(handler),
            tx as gpointer, Some(destroy)) };
        Interval {
            id: id,
            rx: rx,
        }
    }
}

impl Drop for Interval {
    fn drop(&mut self) {
        unsafe { glib_sys::g_source_remove(self.id) };
    }
}

impl Stream for Interval {
    type Item = ();
    type Error = ();

    fn poll(&mut self) -> Result<Async<Option<Self::Item>>, Self::Error> {
        self.rx.poll()
    }
}

fn notify_noop() -> NotifyHandle {
    struct Noop;

    impl Notify for Noop {
        fn notify(&self, _id: usize) {}
    }

    const NOOP : &'static Noop = &Noop;

    NotifyHandle::from(NOOP)
}

unsafe extern fn handler(data: gpointer) -> gboolean {
    let tx = data as *mut Spawn<mpsc::Sender<()>>;
    let notify = notify_noop();
    drop((*tx).start_send_notify((), &notify, 0));
    1
}

pub unsafe extern fn destroy(data: gpointer) {
    let _ = Box::from_raw(data as *mut Spawn<mpsc::Sender<()>>);
}