#![allow(dead_code)]

use std::io::{self, Read, Write};
use std::vec::Vec;
use std::string::String;
use byteorder::{ByteOrder, NetworkEndian};

// FIXME: replace these with byteorder core io traits once those are in
pub fn read_u8(reader: &mut Read) -> io::Result<u8> {
    let mut bytes = [0; 1];
    reader.read_exact(&mut bytes)?;
    Ok(bytes[0])
}

pub fn write_u8(writer: &mut Write, value: u8) -> io::Result<()> {
    let bytes = [value; 1];
    writer.write_all(&bytes)
}

pub fn read_bool(reader: &mut Read) -> io::Result<bool> {
    if read_u8(reader)? == 0 {
        Ok(false)
    } else {
        Ok(true)
    }
}

pub fn write_bool(writer: &mut Write, value: bool) -> io::Result<()> {
    if value {
        write_u8(writer, 1)
    } else {
        write_u8(writer, 0)
    }
}

pub fn read_u16(reader: &mut Read) -> io::Result<u16> {
    let mut bytes = [0; 2];
    reader.read_exact(&mut bytes)?;
    Ok(NetworkEndian::read_u16(&bytes))
}

pub fn write_u16(writer: &mut Write, value: u16) -> io::Result<()> {
    let mut bytes = [0; 2];
    NetworkEndian::write_u16(&mut bytes, value);
    writer.write_all(&bytes)
}

pub fn read_u32(reader: &mut Read) -> io::Result<u32> {
    let mut bytes = [0; 4];
    reader.read_exact(&mut bytes)?;
    Ok(NetworkEndian::read_u32(&bytes))
}

pub fn write_u32(writer: &mut Write, value: u32) -> io::Result<()> {
    let mut bytes = [0; 4];
    NetworkEndian::write_u32(&mut bytes, value);
    writer.write_all(&bytes)
}

pub fn read_u64(reader: &mut Read) -> io::Result<u64> {
    let mut bytes = [0; 8];
    reader.read_exact(&mut bytes)?;
    Ok(NetworkEndian::read_u64(&bytes))
}

pub fn write_u64(writer: &mut Write, value: u64) -> io::Result<()> {
    let mut bytes = [0; 8];
    NetworkEndian::write_u64(&mut bytes, value);
    writer.write_all(&bytes)
}

pub fn read_bytes(reader: &mut Read) -> io::Result<Vec<u8>> {
    let length = read_u32(reader)?;
    let mut value = vec![0; length as usize];
    reader.read_exact(&mut value)?;
    Ok(value)
}

pub fn write_bytes(writer: &mut Write, value: &[u8]) -> io::Result<()> {
    write_u32(writer, value.len() as u32)?;
    writer.write_all(value)
}

pub fn read_string(reader: &mut Read) -> io::Result<String> {
    let bytes = read_bytes(reader)?;
    String::from_utf8(bytes)
           .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "invalid UTF-8"))
}

pub fn write_string(writer: &mut Write, value: &str) -> io::Result<()> {
    write_bytes(writer, value.as_bytes())
}