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/*
 * Created on Sat Nov 28 2020
 *
 * Copyright (c) storycraft. Licensed under the MIT Licence.
 */

//! # Loco protocol implemention
//!
//! An opensource loco protocol implemention written in Rust.
//! Provides command, secure layer and crypto used in networking.
//!
//! ## Specification
//! ### Command
//! | name      | size              |
//! |-----------|-------------------|
//! | header    | (Header) 22 bytes |
//! | data      | header.data_size  |
//!
//! #### Header
//! | name      | size     |
//! |-----------|----------|
//! | id        | 4 bytes  |
//! | status    | 2 bytes  |
//! | name      | 11 bytes |
//! | data_type | 1 bytes  |
//! | data_size | 4 bytes  |
//!
//! ### Secure data
//! | name           | size               |
//! |----------------|--------------------|
//! | header         | (Header) 20 bytes  |
//! | encrypted data | header.size - 16   |
//!
//! #### Header
//! | name      | size     |
//! |-----------|----------|
//! | iv        | 16 bytes |
//! | size      | 4 bytes  |
//!
//! #### Handshake
//! | name             | size       |
//! |------------------|------------|
//! | key size         | 4 bytes    |
//! | key_encrypt_type | 4 bytes    |
//! | encrypt_type     | 4 bytes    |
//! | key              | 256 bytes  |
//!
//! Note: current implemention only supports RSA-AES
//!
//! ## Networking
//! ### Command
//! Stream: `Command #0 | Response command #0 | Broadcast command #1`
//!
//! Client -> Command #0  
//! Server <- Command #0  
//! Server -> Response command #0  
//! Client <- Response command #0  
//! Server -> Broadcast command #1  
//! Client <- Broadcast command #1 
//!
//! Command is likely unordered. To match response and request, use header id.
//!
//! ### Secure data
//! Stream: `Handshake | Secure data #0 | Secure data #1`
//!
//! Client -> Handshake  
//! Client -> Secure data #0  
//! Server <- Secure data #0  
//! Server -> Secure data #1  
//! Client <- Secure data #1  
//!
//! 
//! ## Examples
//! ### Echo server
//! ```
//! use std::{net::{TcpListener, TcpStream}, thread, io};
//! use openssl::rsa::Rsa;
//! use loco_protocol::{command::{Command, Error, Header, processor::CommandProcessor}, io::SecureClientStream, io::SecureServerStream, secure::CryptoStore};
//! 
//! let key = Rsa::generate(2048).expect("Cannot generate rsa key pairs.");
//! 
//! let socket = TcpListener::bind("127.0.0.1:5022").expect("Cannot bind tcp server");
//! socket.set_nonblocking(true).expect("Cannot set socket to unblocked mode");
//! 
//! let tcp = TcpStream::connect("127.0.0.1:5022").expect("Cannot connect tcp stream");
//! tcp.set_nonblocking(true).expect("Cannot set client stream to unblocked mode");
//! 
//! let mut client = CommandProcessor::new(
//!     SecureClientStream::new(
//!         CryptoStore::new().unwrap(),
//!         key.clone(),
//!         tcp
//!     )
//! );
//! 
//! let command = Command {
//!     header: Header {
//!         id: 0,
//!         status: 0,
//!         name: [72_u8, 101, 108, 108, 111, 0, 0, 0, 0, 0, 0],
//!         data_type: 0,
//!         data_size: 5
//!     },
//!     
//!     data: "Hello".as_bytes().into(),
//! };
//! 
//! client.write_commmand(command.clone()).expect("Failed to send command");
//! 
//! loop {
//!     match socket.accept() {
//! 
//!         Ok(connection) => {
//!             let key = key.clone();
//!             let command = command.clone();
//! 
//!             thread::spawn(move || {
//!                 let mut server = CommandProcessor::new(
//!                     SecureServerStream::new(
//!                         CryptoStore::new().unwrap(),
//!                         key,
//!                         connection.0
//!                     )
//!                 );
//! 
//!                 println!("Connected from {}", connection.1);
//!                 loop {
//!                     match server.read_commmand() {
//! 
//!                         Ok(readed) => {
//!                             if readed.is_some() {
//!                                 let received = readed.unwrap();
//!                                 assert_eq!(received, command);
//! 
//!                                 server.write_commmand(received.clone()).expect("Command failed to write");
//!                                 break;
//!                             }
//!                         }
//! 
//!                         Err(err) => panic!(format!("{}", err))
//!                     }
//!                 }
//!             });
//!         }
//! 
//!         Err(err) if err.kind() == io::ErrorKind::WouldBlock => {  }
//! 
//!         Err(err) => panic!(format!("{}", err))
//!     }
//! 
//!     match client.read_commmand() {
//! 
//!         Ok(readed) => {
//!             match readed {
//! 
//!                 Some(received) => {
//!                     assert_eq!(received, command.clone());
//!                     return;
//!                 }
//! 
//!                 None => {}
//!             }
//!         }
//! 
//!         Err(err) => {
//!             match err {
//!                 Error::Io(io_err) if io_err.kind() == io::ErrorKind::WouldBlock => {}
//!                 
//!                 _ => panic!(format!("{}", err))
//!             }
//!         }
//!     }
//! }
//! ```

pub mod command;

pub mod io;

pub mod secure;

pub mod network;