{-# LANGUAGE OverloadedStrings #-}

module HWProtoNEState where

import Data.Maybe

import Data.List

import Control.Monad.Reader

import qualified Data.ByteString.Char8 as B

--------------------------------------

import CoreTypes

import Actions

import Utils

import RoomsAndClients

handleCmd_NotEntered ["NICK", newNick] = do

    (ci, irnc) <- ask

    let cl = irnc `client` ci

    if not . B.null $ nick cl then return [ProtocolError "Nickname already chosen"]

        else

        if haveSameNick irnc then if clientProto cl < 38 then return [ByeClient "Nickname is already in use"] else return [NoticeMessage NickAlreadyInUse]

            else

            if illegalName newNick then return [ByeClient "Illegal nickname"]

                else

                return $

                    ModifyClient (\c -> c{nick = newNick}) :

                    AnswerClients [sendChan cl] ["NICK", newNick] :

                    [CheckRegistered | clientProto cl /= 0]

    where

    haveSameNick irnc = isJust . find (== newNick) . map (nick . client irnc) $ allClients irnc

handleCmd_NotEntered ["PROTO", protoNum] = do

    (ci, irnc) <- ask

    let cl = irnc `client` ci

    if clientProto cl > 0 then return [ProtocolError "Protocol already known"]

        else

        if parsedProto == 0 then return [ProtocolError "Bad number"]

            else

            return $

                ModifyClient (\c -> c{clientProto = parsedProto}) :

                AnswerClients [sendChan cl] ["PROTO", B.pack $ show parsedProto] :

                [CheckRegistered | not . B.null $ nick cl]

    where

        parsedProto = case B.readInt protoNum of

                           Just (i, t) | B.null t -> fromIntegral i

                           _ -> 0

handleCmd_NotEntered ["PASSWORD", passwd] = do

    (ci, irnc) <- ask

    let cl = irnc `client` ci

    if passwd == webPassword cl then

        return $ JoinLobby : [AnswerClients [sendChan cl] ["ADMIN_ACCESS"] | isAdministrator cl]

        else

        return [ByeClient "Authentication failed"]

handleCmd_NotEntered _ = return [ProtocolError "Incorrect command (state: not entered)"]