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//! Unique-ID-Generator inspired by [rs/xid](https://github.com/rs/xid).
//!
//! The ID generated from Ticket only occupies 12 bytes.
//!
//! - 4-byte from unix timestamp,
//! - 3-byte from machine id,
//! - 2-byte from current process id, and
//! - 3-byte counter which starting with a random value.
//!
//! ### Usage
//!
//! ```Rust
//! extern crate ticket;
//! use ticket::{Ticketing, encode, decode};
//!
//!
//! fn main() {
//!     // create a `Ticketing` to generate ticket number.
//!     let id = Ticketing::new().gen();
//!
//!     // using base32 encoding.
//!     println!("{}", id);  // "bekcs9rrtf0263qgv5r0"
//!
//!     // as 12 bytes array.
//!     println!("{:?}", id.as_bytes());  // [91, 168, 206, 39, 123, 235, 192, 35, 15, 80, 249, 118]
//!
//!     // encode and dedode
//!     assert_eq!(decode(&encode(id)), id);
//! }
//! ```
//!

mod ticket;
mod id;

extern crate rand;
extern crate time;
extern crate md5;
extern crate machine_uid;
#[macro_use]
extern crate lazy_static;

pub use ticket::{
    Ticketing
};

pub use id:: {
    ID,
    encode,
    decode
};

/// raw id length
const RAW_LEN: usize = 12;
/// string id length
const ENCODED_LEN: usize = 20;
/// encoding map
const ENCODING: &str = "0123456789abcdefghijklmnopqrstuv";

lazy_static! {
    /// decoding map
    static ref DECODING: [u8; 256] = {
        let mut dec = [0xFFu8; 256];
        for (index, &chr) in ENCODING.as_bytes().iter().enumerate() {
            dec[chr as usize] = index as u8;
        }
        dec
    };
}