use std::iter::Iterator;
use mio;
use base64::{encode};

pub const PROTOCOL_VERSION : u32 = 3;
pub const SERVER: mio::Token = mio::Token(1_000_000_000);

pub fn is_name_illegal(name: &str ) -> bool{
    name.len() > 40 ||
        name.trim().is_empty() ||
        name.chars().any(|c|
            "$()*+?[]^{|}\x7F".contains(c) ||
                '\x00' <= c && c <= '\x1F')
}

pub fn to_engine_msg<T>(msg: T) -> String
    where T: Iterator<Item = u8> + Clone
{
    let mut tmp = Vec::new();
    tmp.push(msg.clone().count() as u8);
    tmp.extend(msg);
    encode(&tmp)
}

pub fn protocol_version_string(protocol_number: u16) -> &'static str {
    match protocol_number {
        17 => "0.9.7-dev",
        19 => "0.9.7",
        20 => "0.9.8-dev",
        21 => "0.9.8",
        22 => "0.9.9-dev",
        23 => "0.9.9",
        24 => "0.9.10-dev",
        25 => "0.9.10",
        26 => "0.9.11-dev",
        27 => "0.9.11",
        28 => "0.9.12-dev",
        29 => "0.9.12",
        30 => "0.9.13-dev",
        31 => "0.9.13",
        32 => "0.9.14-dev",
        33 => "0.9.14",
        34 => "0.9.15-dev",
        35 => "0.9.14.1",
        37 => "0.9.15",
        38 => "0.9.16-dev",
        39 => "0.9.16",
        40 => "0.9.17-dev",
        41 => "0.9.17",
        42 => "0.9.18-dev",
        43 => "0.9.18",
        44 => "0.9.19-dev",
        45 => "0.9.19",
        46 => "0.9.20-dev",
        47 => "0.9.20",
        48 => "0.9.21-dev",
        49 => "0.9.21",
        50 => "0.9.22-dev",
        51 => "0.9.22",
        52 => "0.9.23-dev",
        53 => "0.9.23",
        54 => "0.9.24-dev",
        55 => "0.9.24",
        56 => "0.9.25-dev",
        _ => "Unknown"
    }
}