#![allow(unused_variables)] // TODO(you): remove this lint after implementing this mod
#![allow(dead_code)] // TODO(you): remove this lint after implementing this mod

use anyhow::Result;

use crate::iterators::impls::StorageIterator;

pub struct LsmIterator {}

impl StorageIterator for LsmIterator {
    fn is_valid(&self) -> bool {
        unimplemented!()
    }

    fn key(&self) -> &[u8] {
        unimplemented!()
    }

    fn value(&self) -> &[u8] {
        unimplemented!()
    }

    fn next(&mut self) -> Result<()> {
        unimplemented!()
    }
}

/// A wrapper around existing iterator, will prevent users from calling `next` when the iterator is
/// invalid.
pub struct FusedIterator<I: StorageIterator> {
    iter: I,
}

impl<I: StorageIterator> FusedIterator<I> {
    pub fn new(iter: I) -> Self {
        Self { iter }
    }
}

impl<I: StorageIterator> StorageIterator for FusedIterator<I> {
    fn is_valid(&self) -> bool {
        unimplemented!()
    }

    fn key(&self) -> &[u8] {
        unimplemented!()
    }

    fn value(&self) -> &[u8] {
        unimplemented!()
    }

    fn next(&mut self) -> Result<()> {
        unimplemented!()
    }
}