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use std::time::{Instant, Duration};
use std::borrow::Borrow;

pub struct DoEvery {
    started: Instant,
    last_check: Option<Instant>,
}

impl DoEvery {
    pub fn new() -> Self {
        DoEvery { started: Instant::now(), last_check: None }
    }

    pub fn should_do_every(&mut self, period: impl Borrow<Duration>) -> bool {
        self.should_do_every_sec(period.borrow().as_secs_f32())
    }

    pub fn should_do_every_sec(&mut self, sec: impl Into<f32>) -> bool {
        let sec: f32 = sec.into();
        let now = Instant::now();
        let time_since_start = (now - self.started).as_secs_f32();
        let period_currently_in: u64 = (time_since_start / sec).trunc() as u64;
        let previous_check_time = self.last_check;
        self.last_check = Some(now);

        if period_currently_in == 0 {
            false
        } else {
            match previous_check_time {
                None => true,
                Some(previous_check_time) => {
                    let previous_period = ((previous_check_time - self.started).as_secs_f32() / sec).trunc() as u64;

                    previous_period != period_currently_in
                },
            }
        }
    }

    pub fn should_do_every_min(&mut self, mins: impl Into<f32>) -> bool {
        self.should_do_every_sec(mins.into() * 60.)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::thread::sleep;

    #[test]
    fn test1() {
        let mut counter = DoEvery::new();
        sleep(Duration::from_millis(50));
        assert!(counter.should_do_every_sec(0.01));
    }

    #[test]
    fn test2() {
        let mut counter = DoEvery::new();
        sleep(Duration::from_millis(50));
        assert!(!counter.should_do_every_sec(0.5));
    }

    #[test]
    fn test3() {
        let mut counter = DoEvery::new();
        sleep(Duration::from_millis(10));
        assert!(!counter.should_do_every(Duration::from_millis(25)));
        sleep(Duration::from_millis(10));
        assert!(!counter.should_do_every(Duration::from_millis(25)));
        sleep(Duration::from_millis(10));
        assert!(counter.should_do_every(Duration::from_millis(25)));
    }
}