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use std::ops::Not;
use crate::*;


impl<T:TimePoint> Not for TimeSet<T>
{
    type Output = Self;

    fn not(self) -> Self::Output
    {
        if let Some(first) = self.0.first() {
            let mut compl = Vec::with_capacity(self.0.len() + 1);
            if !first.lower.just_before().is_past_infinite() {
                compl.push((..first.lower).into());
            }
            let mut previous = first.upper.just_after();
            self.0.iter().skip(1)
                .for_each(|tw| {
                    compl.push(TimeInterval { lower: previous, upper: tw.lower.just_before() });
                    previous = tw.upper.just_after();
                });
            if !previous.is_future_infinite() {
                compl.push((previous..).into() );
            }
            TimeSet(compl)
        } else {
            TimeSet::all()
        }
    }
}


impl<T:TimePoint> Not for TimeInterval<T> {

    type Output = TimeSet<T>;

    fn not(self) -> Self::Output
    {
        if self.is_empty() {
            TimeSet::all()
        } else {
            let cut1 = self.lower_bound().just_before();
            let cut2 = self.upper_bound().just_after();
            match (cut1.is_past_infinite(), cut2.is_future_infinite()) {
                (true, true) => TimeSet::empty(),
                (true, false) => TimeSet(vec![TimeInterval { lower: cut2, upper: T::INFINITE }]),
                (false, true) => TimeSet(vec![TimeInterval { lower: -T::INFINITE, upper: cut1 }]),
                (false, false) => TimeSet(vec![
                    TimeInterval { lower: -T::INFINITE, upper: cut1 },
                    TimeInterval { lower: cut2, upper: T::INFINITE },
                ])
            }
        }
    }
}



macro_rules! timepoint {
    ($timepoint:ty) => {
        impl Not for $timepoint {
            type Output = TimeSet<$timepoint>;
            fn not(self) -> Self::Output {
                let first = TimeInterval::before(self.just_before());
                let second = TimeInterval::after(self.just_after());
                if first.is_empty() {
                    if second.is_empty() {
                        TimeSet(vec![])
                    } else {
                        TimeSet(vec![second])
                    }
                } else {
                    if second.is_empty() {
                        TimeSet(vec![first])
                    } else {
                        TimeSet(vec![first, second])
                    }
                }
            }
        }
    }
}

timepoint!(TimeValue);
timepoint!(Timestamp);