use mio;

use crate::{

    server::{

        client::HWClient,

        server::HWServer,

        coretypes::ClientId,

        actions::{Action, Action::*}

    },

    protocol::messages::{

        HWProtocolMessage, HWServerMessage::*

    },

    utils::is_name_illegal

};

#[cfg(feature = "official-server")]

use openssl::sha::sha1;

use std::fmt::{Formatter, LowerHex};

#[derive(PartialEq)]

struct Sha1Digest([u8; 20]);

impl LowerHex for Sha1Digest {

    fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {

        for byte in &self.0 {

            write!(f, "{:02x}", byte)?;

        }

        Ok(())

    }

}

#[cfg(feature = "official-server")]

fn get_hash(client: &HWClient, salt1: &str, salt2: &str) -> Sha1Digest {

    let s = format!("{}{}{}{}{}", salt1, salt2,

                    client.web_password, client.protocol_number, "!hedgewars");

    Sha1Digest(sha1(s.as_bytes()))

}

pub fn handle(server: & mut HWServer, client_id: ClientId, message: HWProtocolMessage) {

    match message {

        HWProtocolMessage::Nick(nick) => {

            let client = &mut server.clients[client_id];

            debug!("{} {}", nick, is_name_illegal(&nick));

            let actions = if client.room_id != None {

                unreachable!()

            }

            else if !client.nick.is_empty() {

                vec![ProtocolError("Nickname already provided.".to_string())]

            }

            else if is_name_illegal(&nick) {

                vec![ByeClient("Illegal nickname! Nicknames must be between 1-40 characters long, must not have a trailing or leading space and must not have any of these characters: $()*+?[]^{|}".to_string())]

            }

            else {

                client.nick = nick.clone();

                vec![Nick(nick).send_self().action(),

                     CheckRegistered]

            };

            server.react(client_id, actions);

        }

        HWProtocolMessage::Proto(proto) => {

            let client = &mut server.clients[client_id];

            let actions = if client.protocol_number != 0 {

                vec![ProtocolError("Protocol already known.".to_string())]

            }

            else if proto == 0 {

                vec![ProtocolError("Bad number.".to_string())]

            }

            else {

                client.protocol_number = proto;

                vec![Proto(proto).send_self().action(),

                     CheckRegistered]

            };

            server.react(client_id, actions);

        }

        #[cfg(feature = "official-server")]

        HWProtocolMessage::Password(hash, salt) => {

            let c = &server.clients[client_id];

            let client_hash = get_hash(c, &salt, &c.server_salt);

            let server_hash = get_hash(c, &c.server_salt, &salt);

            let actions = if client_hash == server_hash {

                vec![ServerAuth(format!("{:x}", server_hash)).send_self().action(),

                     JoinLobby]

            } else {

                vec![ByeClient("Authentication failed".to_string())]

            };

            server.react(client_id, actions);

        }

        #[cfg(feature = "official-server")]

        HWProtocolMessage::Checker(protocol, nick, password) => {

            let c = &mut server.clients[client_id];

            c.nick = nick;

            c.web_password = password;

            c.set_is_checker(true);

        }

        _ => warn!("Incorrect command in logging-in state"),

    }

}