use super::{RawDhcpOption, DhcpOptionError};
use crate::options::DhcpOption;

pub struct TimeOffset;

impl DhcpOption for TimeOffset {
    const CODE: u8 = 2;
    type Item = u32;

    fn parse(option: &RawDhcpOption) -> Result<Self::Item, DhcpOptionError> {
        (option.length == 4)
            .then_some(())
            .ok_or(DhcpOptionError::InvalidLength(option.length, 4))?;
        Ok(u32::from_be_bytes(
            option.data[..4]
                .try_into()
                .expect("The parser pulled exactly 4 bytes"),
        ))
    }
}