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// SPDX-License-Identifier: MIT
// Copyright 2023 IROX Contributors

extern crate alloc;
use alloc::vec::Vec;

#[must_use]
pub struct LoopingForever<T>
where
    T: Clone,
{
    pub(crate) items: Vec<T>,
    pub(crate) index: usize,
}

impl<I> Iterator for LoopingForever<I>
where
    I: Clone,
{
    type Item = I;

    fn next(&mut self) -> Option<Self::Item> {
        let size = self.items.len();
        if size == 0 {
            return None;
        }
        let Some(item) = self.items.get(self.index) else {
            return None;
        };
        let item = item.clone();
        self.index = (self.index + 1) % size;

        Some(item)
    }
}