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use super::plumbing::*;
use super::*;

/// An [`IndexedParallelIterator`] that iterates over two parallel iterators of equal
/// length simultaneously.
///
/// This struct is created by the [`zip_eq`] method on [`IndexedParallelIterator`],
/// see its documentation for more information.
///
/// [`zip_eq`]: trait.IndexedParallelIterator.html#method.zip_eq
/// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html
#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
#[derive(Debug, Clone)]
pub struct ZipEq<A: IndexedParallelIterator, B: IndexedParallelIterator> {
    zip: Zip<A, B>
}

/// Create a new `ZipEq` iterator.
///
/// NB: a free fn because it is NOT part of the end-user API.
#[inline]
pub fn new<A, B>(a: A, b: B) -> ZipEq<A, B>
    where A: IndexedParallelIterator,
          B: IndexedParallelIterator
{
    ZipEq { zip: super::zip::new(a, b) }
}

impl<A, B> ParallelIterator for ZipEq<A, B>
    where A: IndexedParallelIterator,
          B: IndexedParallelIterator
{
    type Item = (A::Item, B::Item);

    fn drive_unindexed<C>(self, consumer: C) -> C::Result
        where C: UnindexedConsumer<Self::Item>
    {
        bridge(self.zip, consumer)
    }

    fn opt_len(&self) -> Option<usize> {
        Some(self.zip.len())
    }
}

impl<A, B> IndexedParallelIterator for ZipEq<A, B>
    where A: IndexedParallelIterator,
          B: IndexedParallelIterator
{
    fn drive<C>(self, consumer: C) -> C::Result
        where C: Consumer<Self::Item>
    {
        bridge(self.zip, consumer)
    }

    fn len(&self) -> usize {
        self.zip.len()
    }

    fn with_producer<CB>(self, callback: CB) -> CB::Output
        where CB: ProducerCallback<Self::Item>
    {
        self.zip.with_producer(callback)
    }
}