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use alloc::{borrow::ToOwned, vec::Vec};
use core::{
    convert::From,
    ops::{Bound, Deref, RangeBounds},
};

#[derive(Debug, Default, Clone)]
pub struct Bytes(Vec<u8>);

impl From<Vec<u8>> for Bytes {
    fn from(value: Vec<u8>) -> Self {
        Self(value)
    }
}

impl From<&[u8]> for Bytes {
    fn from(value: &[u8]) -> Self {
        Self(value.to_owned())
    }
}

impl From<Bytes> for Vec<u8> {
    fn from(value: Bytes) -> Self {
        value.0
    }
}

impl Deref for Bytes {
    type Target = [u8];

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl Bytes {
    pub fn slice(&self, range: impl RangeBounds<usize>) -> Self {
        let len = self.len();
        let begin = match range.start_bound() {
            Bound::Included(&n) => n,
            Bound::Excluded(&n) => n + 1,
            Bound::Unbounded => 0,
        };
        let end = match range.end_bound() {
            Bound::Included(&n) => n + 1,
            Bound::Excluded(&n) => n,
            Bound::Unbounded => len,
        };
        Self::from(&self.0[begin..end])
    }
}