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use std::io::{Read, Write};
use std::convert::From;

use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};

use control::variable_header::VariableHeaderError;
use {Encodable, Decodable};

/// Packet identifier
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub struct PacketIdentifier(pub u16);

impl<'a> Encodable<'a> for PacketIdentifier {
    type Err = VariableHeaderError;

    fn encode<W: Write>(&self, writer: &mut W) -> Result<(), VariableHeaderError> {
        writer.write_u16::<BigEndian>(self.0).map_err(From::from)
    }

    fn encoded_length(&self) -> u32 {
        2
    }
}

impl<'a> Decodable<'a> for PacketIdentifier {
    type Err = VariableHeaderError;
    type Cond = ();

    fn decode_with<R: Read>(reader: &mut R, _rest: Option<()>) -> Result<PacketIdentifier, VariableHeaderError> {
        reader
            .read_u16::<BigEndian>()
            .map(PacketIdentifier)
            .map_err(From::from)
    }
}