(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *)

{$INCLUDE "options.inc"}

unit uIO;

interface

uses SDLh, uTypes;

procedure initModule;

procedure freeModule;

procedure InitIPC;

procedure SendIPC(s: shortstring);

procedure SendIPCXY(cmd: char; X, Y: SmallInt);

procedure SendIPCRaw(p: pointer; len: Longword);

procedure SendIPCAndWaitReply(s: shortstring);

procedure SendKeepAliveMessage(Lag: Longword);

procedure LoadRecordFromFile(fileName: shortstring);

procedure SendStat(sit: TStatInfoType; s: shortstring);

procedure IPCWaitPongEvent;

procedure IPCCheckSock;

procedure NetGetNextCmd;

procedure doPut(putX, putY: LongInt; fromAI: boolean);

implementation

uses uConsole, uConsts, uVariables, uCommands, uUtils, uDebug;

type PCmd = ^TCmd;

     TCmd = packed record

            Next: PCmd;

            loTime: Word;

            case byte of

            1: (len: byte;

                cmd: Char;

                X, Y: SmallInt);

            2: (str: shortstring);

            end;

var IPCSock: PTCPSocket;

    fds: PSDLNet_SocketSet;

    isPonged: boolean;

    SocketString: shortstring;

    headcmd: PCmd;

    lastcmd: PCmd;

    SendEmptyPacketTicks: LongWord;

function AddCmd(Time: Word; str: shortstring): PCmd;

var command: PCmd;

begin

new(command);

FillChar(command^, sizeof(TCmd), 0);

command^.loTime:= Time;

command^.str:= str;

if command^.cmd <> 'F' then dec(command^.len, 2); // cut timestamp

if headcmd = nil then

    begin

    headcmd:= command;

    lastcmd:= command

    end

else

    begin

    lastcmd^.Next:= command;

    lastcmd:= command

    end;

AddCmd:= command;

end;

procedure RemoveCmd;

var tmp: PCmd;

begin

TryDo(headcmd <> nil, 'Engine bug: headcmd = nil', true);

tmp:= headcmd;

headcmd:= headcmd^.Next;

if headcmd = nil then

    lastcmd:= nil;

dispose(tmp)

end;

procedure InitIPC;

var ipaddr: TIPAddress;

begin

    WriteToConsole('Init SDL_Net... ');

    SDLTry(SDLNet_Init = 0, true);

    fds:= SDLNet_AllocSocketSet(1);

    SDLTry(fds <> nil, true);

    WriteLnToConsole(msgOK);

    WriteToConsole('Establishing IPC connection to tcp 127.0.0.1:' + IntToStr(ipcPort) + ' ');

    {$HINTS OFF}

    SDLTry(SDLNet_ResolveHost(ipaddr, PChar('127.0.0.1'), ipcPort) = 0, true);

    {$HINTS ON}

    IPCSock:= SDLNet_TCP_Open(ipaddr);

    SDLTry(IPCSock <> nil, true);

    WriteLnToConsole(msgOK)

end;

procedure ParseIPCCommand(s: shortstring);

var loTicks: Word;

begin

case s[1] of

     '!': begin AddFileLog('Ping? Pong!'); isPonged:= true; end;

     '?': SendIPC(_S'!');

     'e': ParseCommand(copy(s, 2, Length(s) - 1), true);

     'E': OutError(copy(s, 2, Length(s) - 1), true);

     'W': OutError(copy(s, 2, Length(s) - 1), false);

     'M': ParseCommand('landcheck ' + s, true);

     'T': case s[2] of

               'L': GameType:= gmtLocal;

               'D': GameType:= gmtDemo;

               'N': GameType:= gmtNet;

               'S': GameType:= gmtSave;

               else OutError(errmsgIncorrectUse + ' IPC "T" :' + s[2], true) end;

     else

     loTicks:= SDLNet_Read16(@s[byte(s[0]) - 1]);

     AddCmd(loTicks, s);

     AddFileLog('[IPC in] '+s[1]+' ticks '+IntToStr(lastcmd^.loTime));

     end

end;

procedure IPCCheckSock;

var i: LongInt;

    s: shortstring;

begin

    if IPCSock = nil then

        exit;

    fds^.numsockets:= 0;

    SDLNet_AddSocket(fds, IPCSock);

    while SDLNet_CheckSockets(fds, 0) > 0 do

    begin

        i:= SDLNet_TCP_Recv(IPCSock, @s[1], 255 - Length(SocketString));

        if i > 0 then

        begin

            s[0]:= char(i);

            SocketString:= SocketString + s;

            while (Length(SocketString) > 1) and (Length(SocketString) > byte(SocketString[1])) do

            begin

                ParseIPCCommand(copy(SocketString, 2, byte(SocketString[1])));

                Delete(SocketString, 1, Succ(byte(SocketString[1])))

            end

        end

    else

        OutError('IPC connection lost', true)

    end;

end;

procedure LoadRecordFromFile(fileName: shortstring);

var f: file;

    ss: shortstring = '';

    i: LongInt;

    s: shortstring;

begin

// set RDNLY on file open

filemode:= 0;

{$I-}

assign(f, fileName);

reset(f, 1);

tryDo(IOResult = 0, 'Error opening file ' + fileName, true);

i:= 0; // avoid compiler hints

s[0]:= #0;

repeat

    BlockRead(f, s[1], 255 - Length(ss), i);

    if i > 0 then

        begin

        s[0]:= char(i);

        ss:= ss + s;

        while (Length(ss) > 1)and(Length(ss) > byte(ss[1])) do

            begin

            ParseIPCCommand(copy(ss, 2, byte(ss[1])));

            Delete(ss, 1, Succ(byte(ss[1])))

            end

        end

until i = 0;

close(f)

{$I+}

end;

procedure SendStat(sit: TStatInfoType; s: shortstring);

const stc: array [TStatInfoType] of char = ('r', 'D', 'k', 'K', 'H', 'T', 'P', 's', 'S', 'B');

var buf: shortstring;

begin

buf:= 'i' + stc[sit] + s;

SendIPCRaw(@buf[0], length(buf) + 1)

end;

procedure SendIPC(s: shortstring);

begin

if IPCSock <> nil then

    begin

    SendEmptyPacketTicks:= 0;

    if s[0]>#251 then

        s[0]:= #251;

    SDLNet_Write16(GameTicks, @s[Succ(byte(s[0]))]);

    AddFileLog('[IPC out] '+ s[1]);

    inc(s[0], 2);

    SDLNet_TCP_Send(IPCSock, @s, Succ(byte(s[0])))

    end

end;

procedure SendIPCRaw(p: pointer; len: Longword);

begin

if IPCSock <> nil then

    begin

    SDLNet_TCP_Send(IPCSock, p, len)

    end

end;

procedure SendIPCXY(cmd: char; X, Y: SmallInt);

var s: shortstring;

begin

s[0]:= #5;

s[1]:= cmd;

SDLNet_Write16(X, @s[2]);

SDLNet_Write16(Y, @s[4]);

SendIPC(s)

end;

procedure IPCWaitPongEvent;

begin

isPonged:= false;

repeat

    IPCCheckSock;

    SDL_Delay(1)

until isPonged

end;

procedure SendIPCAndWaitReply(s: shortstring);

begin

SendIPC(s);

SendIPC(_S'?');

IPCWaitPongEvent

end;

procedure SendKeepAliveMessage(Lag: Longword);

begin

inc(SendEmptyPacketTicks, Lag);

if (SendEmptyPacketTicks >= cSendEmptyPacketTime) then

    SendIPC(_S'+')

end;

procedure NetGetNextCmd;

var tmpflag: boolean;

    s: shortstring;

    x16, y16: SmallInt;

begin

tmpflag:= true;

while (headcmd <> nil)

    and (tmpflag or (headcmd^.cmd = '#')) // '#' is the only cmd which can be sent within same tick after 'N'

    and ((GameTicks = hiTicks shl 16 + headcmd^.loTime)

        or (headcmd^.cmd = 's') // for these commands time is not specified

        or (headcmd^.cmd = 'h') // seems the hedgewars protocol does not allow remote synced commands

        or (headcmd^.cmd = '#') // must be synced for saves to work

        or (headcmd^.cmd = 'b')

        or (headcmd^.cmd = 'F')) do

    begin

    case headcmd^.cmd of

        '+': ; // do nothing - it is just an empty packet

        '#': begin

            AddFileLog('hiTicks increment by remote message');

            inc(hiTicks);

            end;

        'L': ParseCommand('+left', true);

        'l': ParseCommand('-left', true);

        'R': ParseCommand('+right', true);

        'r': ParseCommand('-right', true);

        'U': ParseCommand('+up', true);

        'u': ParseCommand('-up', true);

        'D': ParseCommand('+down', true);

        'd': ParseCommand('-down', true);

        'Z': ParseCommand('+precise', true);

        'z': ParseCommand('-precise', true);

        'A': ParseCommand('+attack', true);

        'a': ParseCommand('-attack', true);

        'S': ParseCommand('switch', true);

        'j': ParseCommand('ljump', true);

        'J': ParseCommand('hjump', true);

        ',': ParseCommand('skip', true);

        'c': begin

            s:= copy(headcmd^.str, 2, Pred(headcmd^.len));

            ParseCommand('gencmd ' + s, true);

             end;

        's': begin

            s:= copy(headcmd^.str, 2, Pred(headcmd^.len));

            ParseCommand('chatmsg ' + s, true);

            WriteLnToConsole(s)

             end;

        'b': begin

            s:= copy(headcmd^.str, 2, Pred(headcmd^.len));

            ParseCommand('chatmsg ' + #4 + s, true);

            WriteLnToConsole(s)

             end;

// TODO: deprecate 'F'

        'F': ParseCommand('teamgone ' + copy(headcmd^.str, 2, Pred(headcmd^.len)), true);

        'N': begin

            tmpflag:= false;

            lastTurnChecksum:= SDLNet_Read32(@headcmd^.str[2]);

            AddFileLog('got cmd "N": time '+IntToStr(hiTicks shl 16 + headcmd^.loTime))

             end;

        'p': begin

            x16:= SDLNet_Read16(@(headcmd^.X));

            y16:= SDLNet_Read16(@(headcmd^.Y));

            doPut(x16, y16, false)

             end;

        'P': begin

            // these are equations solved for CursorPoint

            // SDLNet_Read16(@(headcmd^.X)) == CursorPoint.X - WorldDx;

            // SDLNet_Read16(@(headcmd^.Y)) == cScreenHeight - CursorPoint.Y - WorldDy;

            if not (CurrentTeam^.ExtDriven and bShowAmmoMenu) then

               begin

               CursorPoint.X:= SmallInt(SDLNet_Read16(@(headcmd^.X))) + WorldDx;

               CursorPoint.Y:= cScreenHeight - SmallInt(SDLNet_Read16(@(headcmd^.Y))) - WorldDy

               end

             end;

        'w': ParseCommand('setweap ' + headcmd^.str[2], true);

        't': ParseCommand('taunt ' + headcmd^.str[2], true);

        'h': ParseCommand('hogsay ' + copy(headcmd^.str, 2, Pred(headcmd^.len)), true);

        '1'..'5': ParseCommand('timer ' + headcmd^.cmd, true);

        else

            if (headcmd^.cmd >= #128) and (headcmd^.cmd <= char(128 + cMaxSlotIndex)) then

                ParseCommand('slot ' + char(byte(headcmd^.cmd) - 79), true)

                else

                OutError('Unexpected protocol command: ' + headcmd^.cmd, True)

        end;

    RemoveCmd

    end;

if (headcmd <> nil) and tmpflag and (not CurrentTeam^.hasGone) then

    TryDo(GameTicks < hiTicks shl 16 + headcmd^.loTime,

            'oops, queue error. in buffer: ' + headcmd^.cmd +

            ' (' + IntToStr(GameTicks) + ' > ' +

            IntToStr(hiTicks shl 16 + headcmd^.loTime) + ')',

            true);

isInLag:= (headcmd = nil) and tmpflag and (not CurrentTeam^.hasGone);

if isInLag then fastUntilLag:= false

end;

procedure chFatalError(var s: shortstring);

begin

    SendIPC('E' + s);

end;

procedure doPut(putX, putY: LongInt; fromAI: boolean);

begin

if CheckNoTeamOrHH or isPaused then

    exit;

bShowFinger:= false;

if not CurrentTeam^.ExtDriven and bShowAmmoMenu then

    begin

    bSelected:= true;

    exit

    end;

with CurrentHedgehog^.Gear^,

    CurrentHedgehog^ do

    if (State and gstHHChooseTarget) <> 0 then

        begin

        isCursorVisible:= false;

        if not CurrentTeam^.ExtDriven then

            begin

            if fromAI then

                begin

                TargetPoint.X:= putX;

                TargetPoint.Y:= putY

                end

            else

                begin

                TargetPoint.X:= CursorPoint.X - WorldDx;

                TargetPoint.Y:= cScreenHeight - CursorPoint.Y - WorldDy;

                end;

            SendIPCXY('p', TargetPoint.X, TargetPoint.Y);

            end

        else

            begin

            TargetPoint.X:= putX;

            TargetPoint.Y:= putY

            end;

        AddFileLog('put: ' + inttostr(TargetPoint.X) + ', ' + inttostr(TargetPoint.Y));

        State:= State and (not gstHHChooseTarget);

        if (Ammoz[CurAmmoType].Ammo.Propz and ammoprop_AttackingPut) <> 0 then

            Message:= Message or (gmAttack and InputMask);

        end

    else

        if CurrentTeam^.ExtDriven then

            OutError('got /put while not being in choose target mode', false)

end;

procedure initModule;

begin

    RegisterVariable('fatal', @chFatalError, true );

    IPCSock:= nil;

    headcmd:= nil;

    lastcmd:= nil;

    isPonged:= false;

    SocketString:= '';

    hiTicks:= 0;

    SendEmptyPacketTicks:= 0;

end;

procedure freeModule;

begin

    while headcmd <> nil do RemoveCmd;

    SDLNet_FreeSocketSet(fds);

    SDLNet_TCP_Close(IPCSock);

    SDLNet_Quit();

end;

end.