use std::io::{Cursor, Read};
use byteorder::{BigEndian, ReadBytesExt};

#[derive(Debug)]
pub(crate) struct SerialConfig {
    pub port: Vec<u8>,    // Port/binary（变长二进制数据）
    pub baudrate: u32,    // Baudrate:32
    pub stopbits: u8,     // Stopbits:8
    pub parity: u8,       // Parity:8
    pub timeout: u32,     // Timeout:32
}

pub(crate) fn parse_serial_config(data: &[u8]) -> std::io::Result<SerialConfig> {
    let mut cursor = Cursor::new(data);

    let port_len = cursor.read_u8()?;
    let mut port = vec![0u8; port_len as usize];
    cursor.read_exact(&mut port)?;

    let baudrate = cursor.read_u32::<BigEndian>()?;
    let stopbits = cursor.read_u8()?;
    let parity = cursor.read_u8()?;
    let timeout = cursor.read_u32::<BigEndian>()?;

    Ok(SerialConfig {
        port,
        baudrate,
        stopbits,
        parity,
        timeout,
    })
}