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use crate::codec::{Codec, StdError, WithOffset, WithSize};

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct RequestTag {
    /// Ask for end of packet
    ///
    /// Signal the last response packet for the request `id`
    /// (E)
    pub eop: bool,
    pub id: u8,
}
impl std::fmt::Display for RequestTag {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "[{}]({})", if self.eop { "E" } else { "-" }, self.id)
    }
}
impl Codec for RequestTag {
    type Error = StdError;
    fn encoded_size(&self) -> usize {
        1 + 1
    }
    unsafe fn encode_in(&self, out: &mut [u8]) -> usize {
        out[0] |= (self.eop as u8) << 7;
        out[1] = self.id;
        1 + 1
    }
    fn decode(out: &[u8]) -> Result<WithSize<Self>, WithOffset<Self::Error>> {
        let min_size = 1 + 1;
        if out.len() < min_size {
            return Err(WithOffset::new(
                0,
                Self::Error::MissingBytes(min_size - out.len()),
            ));
        }
        Ok(WithSize {
            value: Self {
                eop: out[0] & 0x80 != 0,
                id: out[1],
            },
            size: 2,
        })
    }
}