//! Port of the C++ `common.h`: shared payload type and demo constants.

use omnivox::{Cereal, CodecError, Reader, write_byte_vec};

/// Wire-identical to the C++ `DatagramPayload` (cereal field order:
/// `id`, `v1.qword`, `payload`; the `PackedValue64` union only ever
/// serialized its `qword`, so it ports as a plain `u64`).
#[derive(Debug, Default)]
pub struct DatagramPayload {
    pub id: u16,
    pub v1: u64,
    pub payload: Vec<u8>,
}

impl Cereal for DatagramPayload {
    fn encode(&self, out: &mut Vec<u8>) {
        out.extend_from_slice(&self.id.to_le_bytes());
        out.extend_from_slice(&self.v1.to_le_bytes());
        write_byte_vec(out, &self.payload);
    }

    fn decode(bytes: &[u8]) -> Result<Self, CodecError> {
        let mut r = Reader::new(bytes);
        Ok(Self {
            id: r.u16()?,
            v1: r.u64()?,
            payload: r.byte_vec()?,
        })
    }
}

pub const PASSWORD: &str = "SecurePassword123";
pub const SALT: &[u8] = &[0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08];
pub const SERVER_PORT: u16 = 8080;
/// Only used by the client example.
#[allow(dead_code)]
pub const SERVER_ADDR: &str = "127.0.0.1";