module Miscutils where

import IO
import Control.Concurrent.STM
import Data.Word
import Data.Char
import Data.List(find)
import Maybe (fromJust)
import qualified Data.Map as Map
import Data.Time
import Data.Sequence(Seq, empty)
import Network
import qualified Codec.Binary.Base64 as Base64
import qualified Codec.Binary.UTF8.String as UTF8

data ClientInfo =
 ClientInfo
	{
		chan :: TChan [String],
		sendChan :: TChan [String],
		handle :: Handle,
		host :: String,
		connectTime :: UTCTime,
		nick :: String,
		protocol :: Word16,
		room :: String,
		isMaster :: Bool,
		isReady :: Bool,
		forceQuit :: Bool,
		partRoom :: Bool
	}

instance Eq ClientInfo where
	a1 == a2 = handle a1 == handle a2

data HedgehogInfo =
	HedgehogInfo String String

data TeamInfo =
	TeamInfo
	{
		teamowner :: String,
		teamname :: String,
		teamcolor :: String,
		teamgrave :: String,
		teamfort :: String,
		teamvoicepack :: String,
		difficulty :: Int,
		hhnum :: Int,
		hedgehogs :: [HedgehogInfo]
	}

data RoomInfo =
	RoomInfo
	{
		name :: String,
		password :: String,
		roomProto :: Word16,
		teams :: [TeamInfo],
		gamemap :: String,
		gameinprogress :: Bool,
		playersIn :: Int,
		readyPlayers :: Int,
		isRestrictedJoins :: Bool,
		isRestrictedTeams :: Bool,
		roundMsgs :: Seq String,
		leftTeams :: [String],
		params :: Map.Map String [String]
	}
createRoom = (
	RoomInfo
		""
		""
		0
		[]
		"+rnd+"
		False
		1
		0
		False
		False
		Data.Sequence.empty
		[]
		Map.empty
	)

data ServerInfo =
	ServerInfo
	{
		isDedicated :: Bool,
		serverMessage :: String,
		listenPort :: PortNumber,
		loginsNumber :: Int,
		lastHourUsers :: [UTCTime]
	}
newServerInfo = (
	ServerInfo
		True
		"<h2><p align=center><a href=\"http://www.hedgewars.org/\">http://www.hedgewars.org/</a></p></h2>"
		46631
		0
		[]
	)

type ClientsTransform = [ClientInfo] -> [ClientInfo]
type RoomsTransform = [RoomInfo] -> [RoomInfo]
type HandlesSelector = ClientInfo -> [ClientInfo] -> [RoomInfo] -> [ClientInfo]
type Answer = ServerInfo -> (HandlesSelector, [String])
type CmdHandler = ClientInfo -> [ClientInfo] -> [RoomInfo] -> [String] -> (ClientsTransform, RoomsTransform, [Answer])


roomByName :: String -> [RoomInfo] -> RoomInfo
roomByName roomName rooms = fromJust $ find (\room -> roomName == name room) rooms

tselect :: [ClientInfo] -> STM ([String], ClientInfo)
tselect = foldl orElse retry . map (\ci -> (flip (,) ci) `fmap` readTChan (chan ci))

maybeRead :: Read a => String -> Maybe a
maybeRead s = case reads s of
	[(x, rest)] | all isSpace rest -> Just x
	_         -> Nothing

deleteBy2t :: (a -> b -> Bool) -> b -> [a] -> [a]
deleteBy2t _  _ [] = []
deleteBy2t eq x (y:ys) = if y `eq` x then ys else y : deleteBy2t eq x ys

deleteFirstsBy2t :: (a -> b -> Bool) -> [a] -> [b] -> [a]
deleteFirstsBy2t eq =  foldl (flip (deleteBy2t eq))

--clientByHandle :: Handle -> [ClientInfo] -> Maybe ClientInfo
--clientByHandle chandle clients = find (\c -> handle c == chandle) clients

sameRoom :: HandlesSelector
sameRoom client clients rooms = filter (\ci -> room ci == room client) clients

sameProtoLobbyClients :: HandlesSelector
sameProtoLobbyClients client clients rooms = filter (\ci -> room ci == [] && protocol ci == protocol client) clients

otherLobbyClients :: HandlesSelector
otherLobbyClients client clients rooms = filter (\ci -> room ci == []) clients

noRoomSameProto :: HandlesSelector
noRoomSameProto client clients _ = filter (null . room) $ filter (\ci -> protocol client == protocol ci) clients

othersInRoom :: HandlesSelector
othersInRoom client clients rooms = filter (client /=) $ filter (\ci -> room ci == room client) clients

fromRoom :: String -> HandlesSelector
fromRoom roomName _ clients _ = filter (\ci -> room ci == roomName) clients

allClients :: HandlesSelector
allClients _ clients _ = clients

clientOnly :: HandlesSelector
clientOnly client _ _ = [client]

noChangeClients :: ClientsTransform
noChangeClients a = a

modifyClient :: ClientInfo -> ClientsTransform
modifyClient _ [] = error "modifyClient: no such client"
modifyClient client (cl:cls) =
	if cl == client then
		client : cls
	else
		cl : (modifyClient client cls)

modifyRoomClients :: RoomInfo -> (ClientInfo -> ClientInfo) -> ClientsTransform
modifyRoomClients clientsroom clientMod clients = map (\c -> if name clientsroom == room c then clientMod c else c) clients

noChangeRooms :: RoomsTransform
noChangeRooms a = a

addRoom :: RoomInfo -> RoomsTransform
addRoom room rooms = room:rooms

removeRoom :: String -> RoomsTransform
removeRoom roomname rooms = filter (\rm -> roomname /= name rm) rooms

modifyRoom :: RoomInfo -> RoomsTransform
modifyRoom _ [] = error "changeRoomConfig: no such room"
modifyRoom room (rm:rms) =
	if name room == name rm then
		room : rms
	else
		rm : modifyRoom room rms

modifyTeam :: RoomInfo -> TeamInfo -> RoomInfo
modifyTeam room team = room{teams = replaceTeam team $ teams room}
	where
	replaceTeam _ [] = error "modifyTeam: no such team"
	replaceTeam team (t:teams) =
		if teamname team == teamname t then
			team : teams
		else
			t : replaceTeam team teams

proto2ver :: Word16 -> String
proto2ver 17 = "0.9.7-dev"
proto2ver 19 = "0.9.7"
proto2ver 20 = "0.9.8-dev"
proto2ver 21 = "0.9.8"
proto2ver 22 = "0.9.9-dev"
proto2ver 23 = "0.9.9"
proto2ver 24 = "0.9.10-dev"
proto2ver _ = "Unknown"

toEngineMsg :: String -> String
toEngineMsg msg = Base64.encode (fromIntegral (length msg) : (UTF8.encode msg))