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use core::iter::repeat;

use crate::digit::Digit;

pub fn slice_add<T: Copy + Default + Digit>(dst: &mut [T], lhs: &[T], rhs: &[T]) -> bool {
    dst.iter_mut().zip(
        lhs.iter().chain(repeat(&T::ZERO)).zip(
            rhs.iter().chain(repeat(&T::ZERO))
        )
    ).fold(false, |mut c, (o, (a, b))| {
        (*o, c) = a.carry_add(*b, c);
        c
    })
}

pub fn slice_add_inplace<T: Copy + Default + Digit>(lhs: &mut [T], rhs: &[T]) -> bool {
    lhs.iter_mut().zip(
        rhs.iter().chain(repeat(&T::ZERO))
    ).fold(false, |mut c, (o, a)| {
        (*o, c) = a.carry_add(*o, c);
        c
    })
}

pub fn slice_mul_dig<T: Copy + Default + Digit>(dst: &mut [T], lhs: &[T], rhs: T) -> T {
    dst.iter_mut().zip(
        lhs.iter().chain(repeat(&T::ZERO))
    ).fold(T::ZERO, |mut c, (o, d)| {
        (*o, c) = d.carry_mul(rhs, c);
        c
    })
}