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use crate::{
    iter::{
        constructors::into_exact_con_iter::IntoExactSizeConcurrentIter,
        implementors::vec::ConIterOfVec,
    },
    ConIterOfSlice, ConcurrentIterable, IntoConcurrentIter,
};

impl<T: Send + Sync + Default> ConcurrentIterable for Vec<T> {
    type Item<'i> = &'i T where Self: 'i;

    type ConIter<'i> = ConIterOfSlice<'i, T> where Self: 'i;

    fn con_iter(&self) -> Self::ConIter<'_> {
        Self::ConIter::new(self.as_slice())
    }
}

impl<T: Send + Sync + Default> IntoConcurrentIter for Vec<T> {
    type Item = T;

    type ConIter = ConIterOfVec<T>;

    fn into_con_iter(self) -> Self::ConIter {
        Self::ConIter::new(self)
    }
}

impl<T: Send + Sync + Default> IntoExactSizeConcurrentIter for Vec<T> {
    type Item = T;

    type ExactConIter = ConIterOfVec<T>;

    fn into_exact_con_iter(self) -> Self::ExactConIter {
        Self::ExactConIter::new(self)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{
        iter::constructors::into_con_iter::IterIntoConcurrentIter,
        iter::constructors::into_exact_con_iter::IntoExactSizeConcurrentIter, ConcurrentIter,
    };

    #[test]
    fn con_iter() {
        let values = vec!['a', 'b', 'c'];

        let con_iter = values.con_iter();
        assert_eq!(con_iter.next(), Some(&'a'));
        assert_eq!(con_iter.next(), Some(&'b'));
        assert_eq!(con_iter.next(), Some(&'c'));
        assert_eq!(con_iter.next(), None);
    }

    #[test]
    fn into_con_iter() {
        let values = vec!['a', 'b', 'c'];

        let con_iter = values.clone().into_exact_con_iter();
        assert_eq!(con_iter.next(), Some('a'));
        assert_eq!(con_iter.next(), Some('b'));
        assert_eq!(con_iter.next(), Some('c'));
        assert_eq!(con_iter.next(), None);

        let con_iter = values.clone().into_con_iter();
        assert_eq!(con_iter.next(), Some('a'));
        assert_eq!(con_iter.next(), Some('b'));
        assert_eq!(con_iter.next(), Some('c'));
        assert_eq!(con_iter.next(), None);

        let con_iter = values.into_iter().take(2).into_con_iter();
        assert_eq!(con_iter.next(), Some('a'));
        assert_eq!(con_iter.next(), Some('b'));
        assert_eq!(con_iter.next(), None);
    }
}