(*
 * Hedgewars, a free turn based strategy game
 * Copyright (c) 2004-2015 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *)

{$INCLUDE "options.inc"}

unit uCommands;

interface

var isDeveloperMode: boolean;
var isExternalSource: boolean;
type TCommandHandler = procedure (var params: shortstring);

procedure initModule;
procedure freeModule;
procedure RegisterVariable(Name: shortstring; p: TCommandHandler; Trusted: boolean; Rand: boolean);
procedure RegisterVariable(Name: shortstring; p: TCommandHandler; Trusted: boolean);
procedure ParseCommand(CmdStr: shortstring; TrustedSource: boolean); inline;
procedure ParseCommand(CmdStr: shortstring; TrustedSource, ExternalSource: boolean);
procedure ParseTeamCommand(s: shortstring);
procedure StopMessages(Message: Longword);

implementation
uses uConsts, uVariables, uConsole, uUtils, SDLh;

type  PVariable = ^TVariable;
    TVariable = record
        Next: PVariable;
        Name: string[15];
        Handler: TCommandHandler;
        Trusted, Rand: boolean;
        end;

var Variables: PVariable;

procedure RegisterVariable(Name: shortstring; p: TCommandHandler; Trusted: boolean);
begin
RegisterVariable(Name, p, Trusted, false);
end;

procedure RegisterVariable(Name: shortstring; p: TCommandHandler; Trusted: boolean; Rand: boolean);
var value: PVariable;
begin
New(value);
if value = nil then
    ParseCommand('fatal RegisterVariable: value = nil', true);

FillChar(value^, sizeof(TVariable), 0);
value^.Name:= Name;
value^.Handler:= p;
value^.Trusted:= Trusted;
value^.Rand:= Rand;

if Variables = nil then
    Variables:= value
else
    begin
    value^.Next:= Variables;
    Variables:= value
    end;
end;


procedure ParseCommand(CmdStr: shortstring; TrustedSource: boolean); inline;
begin
    ParseCommand(CmdStr, TrustedSource, false)
end;

procedure ParseCommand(CmdStr: shortstring; TrustedSource, ExternalSource: boolean);
var s: shortstring;
    t: PVariable;
    c: char;
begin
isExternalSource:= ExternalSource or ((CurrentTeam <> nil) and CurrentTeam^.ExtDriven);
//WriteLnToConsole(CmdStr);
if CmdStr[0]=#0 then
    exit;

AddFileLog('[Cmd] ' + sanitizeForLog(CmdStr));

c:= CmdStr[1];
if (c = '/') or (c = '$') then
    Delete(CmdStr, 1, 1);
s:= '';
SplitBySpace(CmdStr, s);

t:= Variables;
while t <> nil do
    begin
    if t^.Name = CmdStr then
        begin
        if TrustedSource or t^.Trusted then
            begin
            if t^.Rand and (not CheckNoTeamOrHH) then
                CheckSum:= CheckSum xor LongWord(SDLNet_Read32(@CmdStr)) xor LongWord(s[0]) xor GameTicks;
            t^.Handler(s);
            end;
        exit
        end
    else
        t:= t^.Next
    end;
case c of
    '$': WriteLnToConsole(errmsgUnknownVariable + ': "$' + CmdStr + '"')
    else
        WriteLnToConsole(errmsgUnknownCommand  + ': "/' + CmdStr + '"') end
end;

procedure ParseTeamCommand(s: shortstring);
var Trusted: boolean;
begin
Trusted:= (CurrentTeam <> nil)
          and (not CurrentTeam^.ExtDriven)
          and (CurrentHedgehog^.BotLevel = 0);
ParseCommand(s, Trusted);
if (CurrentTeam <> nil) and (not CurrentTeam^.ExtDriven) and (ReadyTimeLeft > 1) then
    ParseCommand('gencmd R', true)
end;



procedure StopMessages(Message: Longword);
begin
if (Message and gmLeft) <> 0 then
    ParseCommand('/-left', true)
else if (Message and gmRight) <> 0 then
    ParseCommand('/-right', true)
else if (Message and gmUp) <> 0 then
    ParseCommand('/-up', true)
else if (Message and gmDown) <> 0 then
    ParseCommand('/-down', true)
else if (Message and gmAttack) <> 0 then
    ParseCommand('/-attack', true)
end;

procedure initModule;
begin
    Variables:= nil;
    isDeveloperMode:= true;
end;

procedure freeModule;
var t, tt: PVariable;
begin
    tt:= Variables;
    Variables:= nil;
    while tt <> nil do
    begin
        t:= tt;
        tt:= tt^.Next;
        Dispose(t)
    end;
end;

end.