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use std::{fmt, sync::Arc};
use std::{
    pin::Pin,
    time::{Duration, Instant},
};

use crate::rt::Sleep;
use crate::rt::Timer;

/// A user-provided timer to time background tasks.
#[derive(Clone)]
pub(crate) enum Time {
    Timer(Arc<dyn Timer + Send + Sync>),
    Empty,
}

impl fmt::Debug for Time {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Time").finish()
    }
}

/*
pub(crate) fn timeout<F>(tim: Tim, future: F, duration: Duration) -> HyperTimeout<F> {
    HyperTimeout { sleep: tim.sleep(duration), future: future }
}

pin_project_lite::pin_project! {
    pub(crate) struct HyperTimeout<F> {
        sleep: Box<dyn Sleep>,
        #[pin]
        future: F
    }
}

pub(crate) struct Timeout;

impl<F> Future for HyperTimeout<F> where F: Future {

    type Output = Result<F::Output, Timeout>;

    fn poll(self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<Self::Output>{
        let mut this = self.project();
        if let Poll::Ready(v) = this.future.poll(ctx) {
            return Poll::Ready(Ok(v));
        }

        if let Poll::Ready(_) = Pin::new(&mut this.sleep).poll(ctx) {
            return Poll::Ready(Err(Timeout));
        }

        return Poll::Pending;
    }
}
*/

impl Time {
    pub(crate) fn sleep(&self, duration: Duration) -> Box<dyn Sleep + Unpin> {
        match *self {
            Time::Empty => {
                panic!("You must supply a timer.")
            }
            Time::Timer(ref t) => t.sleep(duration),
        }
    }

    pub(crate) fn sleep_until(&self, deadline: Instant) -> Box<dyn Sleep + Unpin> {
        match *self {
            Time::Empty => {
                panic!("You must supply a timer.")
            }
            Time::Timer(ref t) => t.sleep_until(deadline),
        }
    }

    pub(crate) fn reset(&self, sleep: &mut Pin<Box<dyn Sleep>>, new_deadline: Instant) {
        match *self {
            Time::Empty => {
                panic!("You must supply a timer.")
            }
            Time::Timer(ref t) => t.reset(sleep, new_deadline),
        }
    }
}