module Main where

import Text.PrettyPrint.HughesPJ

import qualified Data.MultiMap as MM

import Data.Maybe

import Data.List

import Data.Char

import qualified Data.Set as Set

data HWProtocol = Command String [CmdParam]

    deriving Show

instance Ord HWProtocol where

    (Command a _) `compare` (Command b _) = a `compare` b    

instance Eq HWProtocol where

    (Command a _) == (Command b _) = a == b

data CmdParam = Skip

              | SS

              | LS

              | IntP

              | Many [CmdParam]

    deriving Show

data ParseTree = PTPrefix String [ParseTree]

               | PTCommand String HWProtocol

    deriving Show

cmd = Command

cmd1 s p = Command s [p]

cmd2 s p1 p2 = Command s [p1, p2]

cmdName (Command n _) = n

cmdParams2str (Command _ p) = "TCmdParam" ++ concatMap f p

    where

    f Skip = ""

    f SS = "S"

    f LS = "L"

    f IntP = "i"

    f (Many p) = ""

cmdParams2handlerType (Command _ p) = "handler_" ++ concatMap f p

    where

    f Skip = "_"

    f SS = "S"

    f LS = "L"

    f IntP = "i"

    f (Many p) = 'M' : concatMap f p

cmdParams2record cmd@(Command _ p) = renderStyle style{lineLength = 80} $ 

    text "type " <> text (cmdParams2str cmd)

    <> text " = record" $+$ nest 4 (

    vcat (map (uncurry f) $ zip [1..] $ filter isRendered p) 

    $+$ text "end;")

    where

    isRendered Skip = False

    isRendered (Many _) = False

    isRendered _ = True

    f n Skip = empty

    f n SS = text "str" <> int n <> text ": shortstring;"

    f n LS = text "str" <> int n <> text ": longstring;"

    f n IntP = text "param" <> int n <> text ": LongInt;"

    f _ (Many _) = empty

commandsDescription = [

        cmd "CONNECTED" [Skip, IntP]

        , cmd1 "NICK" SS

        , cmd1 "PROTO" IntP

        , cmd1 "ASKPASSWORD" SS

        , cmd1 "SERVER_AUTH" SS

        , cmd1 "JOINING" SS

        , cmd1 "TEAM_ACCEPTED" SS

        , cmd1 "HH_NUM" $ Many [SS]

        , cmd1 "TEAM_COLOR" $ Many [SS]

        , cmd1 "BANLIST" $ Many [SS]

        , cmd1 "JOINED" $ Many [SS]

        , cmd1 "LOBBY:JOINED" $ Many [SS]

        , cmd2 "LOBBY:LEFT" SS LS

        , cmd2 "CLIENT_FLAGS" SS $ Many [SS]

        , cmd2 "LEFT" SS $ Many [SS]

        , cmd1 "SERVER_MESSAGE" LS

        , cmd1 "ERROR" LS

        , cmd1 "NOTICE" LS

        , cmd1 "WARNING" LS

        , cmd1 "EM" $ Many [LS]

        , cmd1 "PING" $ Many [SS]

        , cmd2 "CHAT" SS LS

        , cmd2 "SERVER_VARS" SS LS

        , cmd2 "BYE" SS LS

        , cmd1 "INFO" $ Many [SS]

        , cmd1 "ROOMS" $ Many [SS]

        , cmd "KICKED" []

        , cmd "RUN_GAME" []

        , cmd "ROUND_FINISHED" []

    ]

hasMany = any isMany

isMany (Many _) = True

isMany _ = False

unknown = Command "__UNKNOWN__" [Many [SS]]

unknowncmd = PTPrefix "$" [PTCommand "$" $ unknown]

fixName = map fixChar

fixChar c | isLetter c = c

          | otherwise = '_'

groupByFirstChar :: [ParseTree] -> [(Char, [ParseTree])]

groupByFirstChar = MM.assocs . MM.fromList . map breakCmd

    where

    breakCmd (PTCommand (c:cs) params) = (c, PTCommand cs params)

makePT cmd@(Command n p) = PTCommand n cmd

buildParseTree cmds = [PTPrefix "!" $ (bpt $ map makePT cmds) ++ [unknowncmd]]

bpt cmds = if not . null $ fst emptyNamed then cmdLeaf emptyNamed else subtree

    where

        emptyNamed = partition (\(_, (PTCommand n _:_)) -> null n) assocs

        assocs = groupByFirstChar cmds

        subtree = map buildsub assocs

        buildsub :: (Char, [ParseTree]) -> ParseTree

        buildsub (c, cmds) = let st = bpt cmds in if null $ drop 1 st then maybeMerge c st else PTPrefix [c] st

        maybeMerge c cmd@[PTCommand {}] = PTPrefix [c] cmd

        maybeMerge c cmd@[PTPrefix s ss] = PTPrefix (c:s) ss

        maybeMerge c [] = PTPrefix [c] []

        cmdLeaf ([(c, hwc:assocs1)], assocs2)

            | null assocs1 = PTPrefix [c] [hwc] : map buildsub assocs2

dumpTree = vcat . map dt

    where

    dt (PTPrefix s st) = text s $$ (nest 1 $ vcat $ map dt st)

    dt _ = empty

renderArrays (letters, commands, handlers) = vcat $ punctuate (char '\n') [grr, cmds, l, s, c, bodies, structs, realHandlers, realHandlersArray]

    where

        maybeQuotes "$" = text "#0"

        maybeQuotes s = if null $ tail s then quotes $ text s else text s

        l = text "const letters: array[0.." <> (int $ length letters - 1) <> text "] of char = "

            <> parens (hsep . punctuate comma $ map maybeQuotes letters) <> semi

        s = text "const commands: array[0.." <> (int $ length commands - 1) <> text "] of integer = "

            <> parens (hsep . punctuate comma $ map text commands) <> semi

        c = text "const handlers: array[0.." <> (int $ length fixedNames - 1) <> text "] of PHandler = "

            <> parens (hsep . punctuate comma $ map (text . (:) '@') handlerTypes) <> semi

        grr = text "const net2cmd: array[0.." <> (int $ length fixedNames - 1) <> text "] of TCmdType = "

            <> parens (hsep . punctuate comma $ map (text . (++) "cmd_") $ reverse fixedNames) <> semi

        handlerTypes = map cmdParams2handlerType $ reverse sortedCmdDescriptions

        sortedCmdDescriptions = sort commandsDescription

        fixedNames = map fixName handlers

        bodies = vcat $ punctuate (char '\n') $ map handlerBody $ nub $ sort handlerTypes

        handlerBody n = text "procedure " <> text n <> semi

            $+$ text "begin" 

            $+$ text "end" <> semi

        cmds = text "type TCmdType = " <> parens (hsep $ punctuate comma $ concatMap (rhentry "cmd_") $ sortedCmdDescriptions) <> semi

        structs = vcat (map text . Set.toList . Set.fromList $ map cmdParams2record commandsDescription)

        realHandlers = vcat $ punctuate (char '\n') $ map rh $ sortedCmdDescriptions

        realHandlersArray = text "const handlers: array[TCmdType] of PHandler = "

            <> parens (hsep . punctuate comma . concatMap (rhentry "@handler_") $ sortedCmdDescriptions) <> semi

rh cmd@(Command n p) = text "procedure handler_" <> text (fixName n) <> parens (text "var p: " <> text (cmdParams2str cmd)) <> semi

    $+$ emptyBody $+$ if hasMany p then vcat [space, text "procedure handler_" <> text (fixName n) <> text "_s" <> parens (text "var s: TCmdParamS") <> semi

    , emptyBody] else empty

    where

        emptyBody = text "begin"  $+$ text "end" <> semi

rhentry prefix cmd@(Command n p) = map ((<>) (text "PHandler") . parens) $ (text . (++) prefix . fixName . cmdName $ cmd)

    : if hasMany p then [text . flip (++) "_s" . (++) prefix . fixName . cmdName $ cmd] else []

pas = renderArrays $ buildTables $ buildParseTree commandsDescription

    where

        buildTables cmds = let (_, _, _, t1, t2, t3) = foldr walk (0, [0], -10, [], [], [[]]) cmds in (tail t1, tail t2, concat t3)

        walk (PTCommand _ (Command n params)) (lc, s:sh, pc, tbl1, tbl2, (t3:tbl3)) =

            (lc, 1:sh, pc - 1, "#10":tbl1, show pc:tbl2, (n:t3):tbl3)

        walk (PTPrefix prefix cmds) l = lvldown $ foldr fpf (foldr walk (lvlup l) cmds) prefix

        lvlup (lc, sh, pc, tbl1, tbl2, tbl3) = (lc, 0:sh, pc, tbl1, tbl2, []:tbl3)

        lvldown (lc, s1:s2:sh, pc, tbl1, t:tbl2, t31:t32:tbl3) = (lc, s1+s2:sh, pc, tbl1, (if null t32 then "0" else show s1):tbl2, (t31 ++ t32):tbl3)

        fpf c (lc, s:sh, pc, tbl1, tbl2, tbl3) = (lc + 1, s+1:sh, pc, [c]:tbl1, "0":tbl2, tbl3)

main =

    putStrLn $ renderStyle style{lineLength = 80} $ pas

    --putStrLn $ renderStyle style{lineLength = 80} $ dumpTree $ buildParseTree commandsDescription