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use std::cmp::min;

use super::*;

/// [Deserializer] for slices. Used in [`FactoryExt::parse_slice`] and [`AtomicExt::parse_slice`].
///
/// [`FactoryExt::parse_slice`]: crate::rcore::FactoryExt::parse_slice
/// [`AtomicExt::parse_slice`]: crate::atomic::AtomicExt::parse_slice
#[derive(Debug)]
pub struct SliceDeserializer<'a> {
    slice: &'a [u8],
    pos: usize,
}

impl<'a> From<&'a [u8]> for SliceDeserializer<'a> {
    fn from(value: &'a [u8]) -> Self {
        SliceDeserializer {
            slice: value,
            pos: 0,
        }
    }
}

impl Deserializer for SliceDeserializer<'_> {
    fn read_n(&mut self, n: usize) -> &[u8] {
        let (slice_l, slice_r) = self.slice.split_at(min(n, self.slice.len()));
        self.slice = slice_r;
        self.pos += slice_l.len();
        slice_l
    }

    fn read_all(&mut self) -> &[u8] {
        let slice_l = self.slice;
        self.slice = &[];
        self.pos += slice_l.len();
        slice_l
    }

    fn tell(&self) -> usize {
        self.pos
    }
}