#![allow(non_snake_case)]

use byteorder::{ByteOrder, LittleEndian, NativeEndian, ReadBytesExt};
use std::convert::TryInto;
use std::io;

#[derive(Clone, Copy, Debug)]
pub enum Endian {
    NativeEndian,
    LittleEndian,
    BigEndian,
}

macro_rules! unpack_num {
    ($type:ty, $endian:expr, $input:expr) => {
        match $endian {
            Endian::LittleEndian => <$type>::from_le_bytes($input.try_into().unwrap()),
            Endian::BigEndian => <$type>::from_be_bytes($input.try_into().unwrap()),
            Endian::NativeEndian => <$type>::from_ne_bytes($input.try_into().unwrap()),
        }
    };
}

pub fn unpack_h(endian: Endian, input: &[u8]) -> i16 {
    unpack_num!(i16, endian, input)
}

pub fn unpack_H(endian: Endian, input: &[u8]) -> u16 {
    unpack_num!(u16, endian, input)
}

pub fn unpack_l(endian: Endian, input: &[u8]) -> i32 {
    unpack_num!(i32, endian, input)
}

pub fn unpack_L(endian: Endian, input: &[u8]) -> u32 {
    unpack_num!(u32, endian, input)
}