unit uFLNet;
interface

procedure connectOfficialServer;

procedure initModule;
procedure freeModule;
procedure sendNet(s: shortstring);
procedure sendNetLn(s: shortstring);

var isConnected: boolean = false;

implementation
uses SDLh, uFLIPC, uFLTypes, uFLUICallback, uFLNetTypes, uFLUtils;

const endCmd: shortstring = #10 + #10;

function getNextChar: char; forward;
function getCurrChar: char; forward;

type
    TParserState = record
                       cmd: TCmdType;
                       l: LongInt;
                       buf: shortstring;
                       bufpos: byte;
                   end;
    PHandler = procedure;

var state: TParserState;

procedure handleTail; forward;
function getShortString: shortstring; forward;
function getLongString: ansistring; forward;

procedure handler_;
begin
    sendUI(mtNetData, @state.cmd, sizeof(state.cmd));
    handleTail()
end;

procedure handler_L;
var cmd: TCmdParamL;
begin
    cmd.cmd:= state.cmd;
    cmd.str1:= getLongString;
    if length(cmd.str1) = 0 then exit;
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler_ML;
var cmd: TCmdParamL;
    f: boolean;
begin
    sendUI(mtNetData, @state.cmd, sizeof(state.cmd));
    cmd.cmd:= Succ(state.cmd);

    repeat
        cmd.str1:= getLongString;
        f:= cmd.str1[0] <> #0;
        if f then
            sendUI(mtNetData, @cmd, sizeof(cmd));
    until not f;
    state.l:= 0
end;

procedure handler_MS;
var cmd: TCmdParamS;
    f: boolean;
begin
    sendUI(mtNetData, @state.cmd, sizeof(state.cmd));
    cmd.cmd:= Succ(state.cmd);

    repeat
        cmd.str1:= getShortString;
        f:= cmd.str1[0] <> #0;
        if f then
            sendUI(mtNetData, @cmd, sizeof(cmd));
    until not f;
    state.l:= 0
end;

procedure handler_S;
var cmd: TCmdParamS;
begin
    cmd.cmd:= state.cmd;
    cmd.str1:= getShortString;
    if cmd.str1[0] = #0 then exit;
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler_SL;
var cmd: TCmdParamSL;
begin
    cmd.cmd:= state.cmd;
    cmd.str1:= getShortString;
    if cmd.str1[0] = #0 then exit;
    cmd.str2:= getLongString;
    if cmd.str2[0] = #0 then exit;
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler_SMS;
var cmd: TCmdParamS;
    f: boolean;
begin
    cmd.cmd:= state.cmd;
    cmd.str1:= getShortString;
    if cmd.str1[0] = #0 then exit;
    sendUI(mtNetData, @cmd, sizeof(cmd));

    cmd.cmd:= Succ(state.cmd);
    repeat
        cmd.str1:= getShortString;
        f:= cmd.str1[0] <> #0;
        if f then
            sendUI(mtNetData, @cmd, sizeof(cmd));
    until not f;
    state.l:= 0
end;

procedure handler_SS;
var cmd: TCmdParamSS;
begin
    cmd.cmd:= state.cmd;
    cmd.str1:= getShortString;
    if cmd.str1[0] = #0 then exit;
    cmd.str2:= getShortString;
    if cmd.str2[0] = #0 then exit;
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler__i;
var cmd: TCmdParami;
    s: shortstring;
begin
    s:= getShortString();
    if s[0] = #0 then exit;
    cmd.cmd:= state.cmd;
    s:= getShortString();
    if s[0] = #0 then exit;
    cmd.param1:= strToInt(s);
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler_i;
var cmd: TCmdParami;
    s: shortstring;
begin
    s:= getShortString();
    if s[0] = #0 then exit;
    cmd.cmd:= state.cmd;
    cmd.param1:= strToInt(s);
    sendUI(mtNetData, @cmd, sizeof(cmd));
    handleTail()
end;

procedure handler__UNKNOWN_;
begin
    //writeln('[NET] Unknown cmd');
    handleTail();
    state.l:= 0
end;

const net2cmd: array[0..46] of TCmdType = (cmd_WARNING, cmd_WARNING,
    cmd_TEAM_COLOR, cmd_TEAM_ACCEPTED, cmd_SERVER_VARS, cmd_SERVER_MESSAGE,
    cmd_SERVER_AUTH, cmd_RUN_GAME, cmd_ROUND_FINISHED, cmd_ROOM_UPD, cmd_ROOM_DEL,
    cmd_ROOM_ADD, cmd_ROOMS, cmd_REMOVE_TEAM, cmd_PROTO, cmd_PING, cmd_NOTICE,
    cmd_NICK, cmd_LOBBY_LEFT, cmd_LOBBY_JOINED, cmd_LEFT, cmd_KICKED, cmd_JOINING,
    cmd_JOINED, cmd_INFO, cmd_HH_NUM, cmd_ERROR, cmd_EM, cmd_CONNECTED,
    cmd_CLIENT_FLAGS, cmd_CHAT, cmd_CFG_THEME, cmd_CFG_TEMPLATE, cmd_CFG_SEED,
    cmd_CFG_SCRIPT, cmd_CFG_SCHEME, cmd_CFG_MAZE_SIZE, cmd_CFG_MAP, cmd_CFG_MAPGEN,
    cmd_CFG_FULLMAPCONFIG, cmd_CFG_FEATURE_SIZE, cmd_CFG_DRAWNMAP, cmd_CFG_AMMO,
    cmd_BYE, cmd_BANLIST, cmd_ASKPASSWORD, cmd_ADD_TEAM);
const letters: array[0..332] of char = ('A', 'D', 'D', '_', 'T', 'E', 'A', 'M',
    #10, 'S', 'K', 'P', 'A', 'S', 'S', 'W', 'O', 'R', 'D', #10, 'B', 'A', 'N', 'L',
    'I', 'S', 'T', #10, 'Y', 'E', #10, 'C', 'F', 'G', #10, 'A', 'M', 'M', 'O', #10,
    'D', 'R', 'A', 'W', 'N', 'M', 'A', 'P', #10, 'F', 'E', 'A', 'T', 'U', 'R', 'E',
    '_', 'S', 'I', 'Z', 'E', #10, 'U', 'L', 'L', 'M', 'A', 'P', 'C', 'O', 'N', 'F',
    'I', 'G', #10, 'M', 'A', 'P', 'G', 'E', 'N', #10, #10, 'Z', 'E', '_', 'S', 'I',
    'Z', 'E', #10, 'S', 'C', 'H', 'E', 'M', 'E', #10, 'R', 'I', 'P', 'T', #10, 'E',
    'E', 'D', #10, 'T', 'E', 'M', 'P', 'L', 'A', 'T', 'E', #10, 'H', 'E', 'M', 'E',
    #10, 'H', 'A', 'T', #10, 'L', 'I', 'E', 'N', 'T', '_', 'F', 'L', 'A', 'G', 'S',
    #10, 'O', 'N', 'N', 'E', 'C', 'T', 'E', 'D', #10, 'E', 'M', #10, 'R', 'R', 'O',
    'R', #10, 'H', 'H', '_', 'N', 'U', 'M', #10, 'I', 'N', 'F', 'O', #10, 'J', 'O',
    'I', 'N', 'E', 'D', #10, 'I', 'N', 'G', #10, 'K', 'I', 'C', 'K', 'E', 'D', #10,
    'L', 'E', 'F', 'T', #10, 'O', 'B', 'B', 'Y', ':', 'J', 'O', 'I', 'N', 'E', 'D',
    #10, 'L', 'E', 'F', 'T', #10, 'N', 'I', 'C', 'K', #10, 'O', 'T', 'I', 'C', 'E',
    #10, 'P', 'I', 'N', 'G', #10, 'R', 'O', 'T', 'O', #10, 'R', 'E', 'M', 'O', 'V',
    'E', '_', 'T', 'E', 'A', 'M', #10, 'O', 'O', 'M', 'S', #10, #10, 'A', 'D', 'D',
    #10, 'D', 'E', 'L', #10, 'U', 'P', 'D', #10, 'U', 'N', 'D', '_', 'F', 'I', 'N',
    'I', 'S', 'H', 'E', 'D', #10, 'U', 'N', '_', 'G', 'A', 'M', 'E', #10, 'S', 'E',
    'R', 'V', 'E', 'R', '_', 'A', 'U', 'T', 'H', #10, 'M', 'E', 'S', 'S', 'A', 'G',
    'E', #10, 'V', 'A', 'R', 'S', #10, 'T', 'E', 'A', 'M', '_', 'A', 'C', 'C', 'E',
    'P', 'T', 'E', 'D', #10, 'C', 'O', 'L', 'O', 'R', #10, 'W', 'A', 'R', 'N', 'I',
    'N', 'G', #10, #0, #10);
const commands: array[0..332] of integer = (20, 8, 0, 0, 0, 0, 0, 0, -56, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, -55, 11, 7, 0, 0, 0, 0, 0, -54, 0, 0, -53, 115, 89, 0,
    0, 5, 0, 0, 0, -52, 9, 0, 0, 0, 0, 0, 0, 0, -51, 26, 12, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, -50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -49, 16, 0, 6, 4, 0, 0, -48, -47,
    0, 0, 0, 0, 0, 0, 0, -46, 16, 11, 5, 0, 0, 0, -45, 0, 0, 0, 0, -44, 0, 0, 0,
    -43, 0, 8, 0, 0, 0, 0, 0, 0, -42, 0, 0, 0, 0, -41, 4, 0, 0, -40, 12, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, -39, 0, 0, 0, 0, 0, 0, 0, 0, -38, 8, 2, -37, 0, 0, 0, 0, -36,
    7, 0, 0, 0, 0, 0, -35, 5, 0, 0, 0, -34, 11, 0, 0, 0, 3, 0, -33, 0, 0, 0, -32, 7,
    0, 0, 0, 0, 0, -31, 22, 4, 0, 0, -30, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, -29, 0,
    0, 0, 0, -28, 11, 4, 0, 0, -27, 0, 0, 0, 0, 0, -26, 10, 4, 0, 0, -25, 0, 0, 0,
    0, -24, 51, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, -23, 31, 17, 0, 2, -22, 0, 4, 0, 0,
    -21, 4, 0, 0, -20, 0, 0, 0, -19, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -18, 0, 0,
    0, 0, 0, 0, 0, -17, 25, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, -16, 8, 0, 0, 0, 0, 0, 0,
    -15, 0, 0, 0, 0, -14, 20, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, -13, 0, 0, 0, 0,
    0, -12, 8, 0, 0, 0, 0, 0, 0, -11, 0, -10);
const handlers: array[0..46] of PHandler = (@handler__UNKNOWN_, @handler_L,
    @handler_SS, @handler_S, @handler_SL, @handler_L, @handler_S, @handler_,
    @handler_, @handler_MS, @handler_S, @handler_MS, @handler_MS, @handler_S,
    @handler_i, @handler_MS, @handler_L, @handler_S, @handler_SL, @handler_MS,
    @handler_SL, @handler_, @handler_S, @handler_MS, @handler_MS, @handler_SS,
    @handler_L, @handler_ML, @handler__i, @handler_SMS, @handler_SL, @handler_S,
    @handler_i, @handler_S, @handler_S, @handler_MS, @handler_i, @handler_i,
    @handler_S, @handler_MS, @handler_i, @handler_L, @handler_SL, @handler_SL,
    @handler_MS, @handler_S, @handler_MS);

procedure handleTail;
var cnt: Longint;
    c: char;
begin
    c:= getCurrChar;
    repeat
        if c = #10 then cnt:= 0 else cnt:= 1;
        repeat
            c:= getNextChar;
            inc(cnt)
        until (c = #0) or (c = #10);
    until (c = #0) or (cnt = 1);
    state.l:= 0
end;

var sock: PTCPSocket;
    netReaderThread: PSDL_Thread;

function getCurrChar: char;
begin
    getCurrChar:= state.buf[state.bufpos]
end;

function getNextChar: char;
var r: byte;
begin
    if state.bufpos < byte(state.buf[0]) then
    begin
        inc(state.bufpos);
    end else
    begin
        r:= SDLNet_TCP_Recv(sock, @state.buf[1], 255);
        if r > 0 then
        begin
            state.bufpos:= 1;
            state.buf[0]:= char(r);
        end else
        begin
            state.bufpos:= 0;
            state.buf[0]:= #0;
        end
    end;

    getNextChar:= state.buf[state.bufpos];
end;

function netReader(data: pointer): LongInt; cdecl; export;
var c: char;
    ipaddr: TIPAddress;
begin
    netReader:= 0;

    if SDLNet_ResolveHost(ipaddr, PChar('netserver.hedgewars.org'), 46631) = 0 then
        sock:= SDLNet_TCP_Open(ipaddr);

    repeat
        c:= getNextChar;
        //writeln('>>>>> ', c, ' [', letters[state.l], '] ', commands[state.l], ' ', state.l);
        if c = #0 then
            isConnected:= false
        else
        begin
            while (letters[state.l] <> c) and (commands[state.l] > 0) do
                inc(state.l, commands[state.l]);

            if c = letters[state.l] then
                if commands[state.l] < 0 then
                begin
                    state.cmd:= net2cmd[-10 - commands[state.l]];
                    //writeln('[NET] ', state.cmd);
                    handlers[-10 - commands[state.l]]();
                    state.l:= 0
                end
                else
                    inc(state.l)
            else
            begin
                handler__UNKNOWN_()
            end
        end
    until not isConnected;

    SDLNet_TCP_Close(sock);
    sock:= nil;

    writeln('[NET] netReader: disconnected');
end;

procedure sendNet(s: shortstring);
begin
    writeln('[NET] Send: ', s);
    ipcToNet(s + endCmd);
end;

procedure sendNetLn(s: shortstring);
begin
    writeln('[NET] Send: ', s);
    ipcToNet(s + #10);
end;

function getShortString: shortstring;
var s: shortstring;
    c: char;
begin
    s[0]:= #0;

    repeat
        inc(s[0]);
        s[byte(s[0])]:= getNextChar
    until (s[0] = #255) or (s[byte(s[0])] = #10) or (s[byte(s[0])] = #0);

    if s[byte(s[0])] = #10 then
        dec(s[0])
    else
        repeat c:= getNextChar until (c = #0) or (c = #10);

    getShortString:= s
end;

function getLongString: ansistring;
var s: shortstring;
    l: ansistring;
    c: char;
begin
    l:= '';

    repeat
        s[0]:= #0;
            repeat
                inc(s[0]);
                c:= getNextChar;
                s[byte(s[0])]:= c
            until (s[0] = #255) or (c = #10) or (c = #0);

        if s[byte(s[0])] = #10 then
            dec(s[0]);

        l:= l + s
    until (c = #10) or (c = #0);

    getLongString:= l
end;

procedure netSendCallback(p: pointer; msg: PChar; len: Longword);
begin
    // W A R N I N G: totally thread-unsafe due to use of sock variable
    SDLNet_TCP_Send(sock, msg, len);
end;

procedure connectOfficialServer;
begin
    if sock <> nil then
        exit;

    state.bufpos:= 0;
    state.buf:= '';

    state.l:= 0;
    isConnected:= true;

    netReaderThread:= SDL_CreateThread(@netReader, 'netReader', nil);
    SDL_DetachThread(netReaderThread)
end;

procedure initModule;
begin
    sock:= nil;
    isConnected:= false;

    SDLNet_Init;

    registerNetCallback(nil, @netSendCallback);
end;

procedure freeModule;
begin
end;

end.