horloge 0.2.3

use crate::{impl_now, impl_sleep};
use ::std::time::{Duration, Instant};
use tokio1::time::sleep;

/// Tokio clock with std types using the system time.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SystemTokio1StdClock;

impl_now! {
  impl Now for SystemTokio1StdClock {
    type Instant = Instant;

    fn now(&this)-> Self::Instant {
      Instant::now()
    }
  }
}

/// Type alias for the timer type used by `SystemTokio1StdClock` for
/// its `Clock` implementation.
pub type SystemTokio1StdTimer = ::tokio1::time::Sleep;

impl_sleep! {
  impl Sleep<Duration> for SystemTokio1StdClock {
    type Timer = SystemTokio1StdTimer;

    fn sleep(&this, duration: Duration) -> Self::Timer {
      sleep(duration)
    }
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  use crate::{ErasedStdClock, Now, NowExt, StdClock, StdNow};
  const ONE_YEAR: Duration = Duration::new(365 * 24 * 60 * 60, 0);

  #[test]
  fn test_now() {
    let clock = SystemTokio1StdClock;
    use_now(&clock);
    use_std_now(&clock);
    use_std_clock(&clock);
    use_dyn_now(Box::new(clock));
  }

  fn use_now<TyNow>(clock: &TyNow)
  where
    TyNow: Now<Instant = Instant>,
  {
    let one_year_ago = Instant::now() - ONE_YEAR;
    let now: Instant = clock.now();
    assert!(now > one_year_ago);
    use_std_now(clock);
  }

  fn use_std_now<TyNow>(clock: &TyNow)
  where
    TyNow: StdNow,
  {
    let one_year_ago = Instant::now() - ONE_YEAR;
    let now: Instant = clock.now_std();
    assert!(now > one_year_ago);
  }

  fn use_dyn_now(clock: Box<dyn ErasedStdClock>) {
    let now = clock.now_std();
    let elapsed = clock.saturating_duration_since(now);
    assert!(elapsed >= Duration::ZERO);
  }

  fn use_std_clock<TyClock>(clock: &TyClock)
  where
    TyClock: StdClock,
  {
    let one_year_ago = Instant::now() - ONE_YEAR;
    let now: Instant = clock.now_std();
    assert!(now > one_year_ago);
  }
}