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use std::collections::VecDeque;

use crate::{Iterable, IterableSeq};

impl<T> Iterable for VecDeque<T> {
    type C = Self;
    type CC<U> = VecDeque<U>;

    fn add_one(mut self, a: Self::Item) -> Self::C {
        self.push_back(a);
        self
    }
}

impl<'a, T> Iterable for &'a VecDeque<T> {
    type C = VecDeque<&'a T>;
    type CC<U> = VecDeque<U>;
}

impl<T> IterableSeq for VecDeque<T> {}
impl<'a, T> IterableSeq for &'a VecDeque<T> {}

delegate_into_iterator!(VecDeque<T>, impl <T>);
delegate_into_iterator!(&'a VecDeque<T>, impl <'a, T: 'a>);

delegate_from_iterator!(VecDeque<T>, T, impl <T>);
delegate_extend!(VecDeque<T>, T, impl <T>);

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

    fn vd<T>(v: Vec<T>) -> VecDeque<T> {
        v.into_iter().collect()
    }

    #[test]
    fn test_c() {
        let v = vd(vec![1, 2, 3]);
        let res = v.filter(|i| i > &1);
        assert_eq!(res, vd(vec![2, 3]));
    }

    #[test]
    fn test_cc() {
        let v = vd(vec![1, 2, 3]);
        let res = v.map(|i| i.to_string());
        assert_eq!(
            res,
            vd(vec!["1".to_string(), "2".to_string(), "3".to_string()])
        );
    }

    #[test]
    fn test_c_r() {
        let v = vd(vec![1, 2, 3]);
        let res = (&v).filter(|i| i > &&1);
        assert_eq!(res, vd(vec![&2, &3]));
    }

    #[test]
    fn test_cc_r() {
        let v = vd(vec![1, 2, 3]);
        let res = (&v).map(|i| i.to_string());
        assert_eq!(
            res,
            vd(vec!["1".to_string(), "2".to_string(), "3".to_string()])
        );
    }
}