use base64::encode;

use mio;

use std::iter::Iterator;

pub const PROTOCOL_VERSION: u32 = 3;

pub const SERVER_TOKEN: mio::Token = mio::Token(1_000_000_000);

pub const IO_TOKEN: mio::Token = mio::Token(1_000_000_001);

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",

        57 => "0.9.25",

        58 => "1.0.0-dev",

        _ => "Unknown",

    }

}