(*
 * 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
 *)


procedure internalStartGameWithParameters();
var tmp: LongInt;
begin
    UserPathPrefix:= ParamStr(1);
    cScreenWidth:= StrToInt(ParamStr(2));
    cScreenHeight:= StrToInt(ParamStr(3));
    cBits:= StrToInt(ParamStr(4));
    ipcPort:= StrToInt(ParamStr(5));
    cFullScreen:= ParamStr(6) = '1';
    SetSound(ParamStr(7) = '1');
    SetMusic(ParamStr(8) = '1');
    SetVolume(StrToInt(ParamStr(9)));
    cTimerInterval:= StrToInt(ParamStr(10));
    PathPrefix:= ParamStr(11);
    cShowFPS:= ParamStr(12) = '1';
    cAltDamage:= ParamStr(13) = '1';
    UserNick:= DecodeBase64(ParamStr(14));
    cReducedQuality:= StrToInt(ParamStr(15));
    tmp:= StrToInt(ParamStr(16));
    GrayScale:= false;
    if (tmp > 9) and (tmp < 16) then 
        begin
        GrayScale:= true;
        cStereoMode:= TStereoMode(max(0, min(ord(high(TStereoMode)), tmp-9)))
        end
    else if tmp <= 9 then 
        cStereoMode:= TStereoMode(max(0, min(ord(high(TStereoMode)), tmp)))
    else 
        cStereoMode:= TStereoMode(max(0, min(ord(high(TStereoMode)), tmp-6)));
    cLocaleFName:= ParamStr(17);
end;

{$IFDEF USE_VIDEO_RECORDING}
procedure internalStartVideoRecordingWithParameters();
begin
    internalStartGameWithParameters();
    GameType:= gmtRecord;
    cVideoFramerateNum:= StrToInt(ParamStr(18));
    cVideoFramerateDen:= StrToInt(ParamStr(19));
    RecPrefix:= ParamStr(20);
    cAVFormat:= ParamStr(21);
    cVideoCodec:= ParamStr(22);
    cVideoQuality:= StrToInt(ParamStr(23));
    cAudioCodec:= ParamStr(24);
end;
{$ENDIF}

procedure DisplayUsage;
begin
    WriteLn(stdout, 'Usage:');
    WriteLn(stdout, '');
    WriteLn(stdout, '  hwengine <path to user hedgewars folder> <path to global data folder> <path to replay file> [options]');
    WriteLn(stdout, '');
    WriteLn(stdout, 'where [options] are any of the following:');
    WriteLn(stdout, ' --locale [path to language file]');
    WriteLn(stdout, ' --width  [screen width in pixels]');
    WriteLn(stdout, ' --height [screen height in pixels]');
    WriteLn(stdout, ' --depth  [color depth]');
    WriteLn(stdout, ' --volume [sound level]');
    WriteLn(stdout, ' --time   [number of seconds]');
    WriteLn(stdout, ' --nomusic');
    WriteLn(stdout, ' --nosound');
    WriteLn(stdout, ' --fullscreen');
    WriteLn(stdout, ' --showfps');
    WriteLn(stdout, ' --altdmg');
    WriteLn(stdout, ' --lowquality');
    WriteLn(stdout, ' --stats-only');
    WriteLn(stdout, ' --help');
    WriteLn(stdout, '');
    WriteLn(stdout, 'Deprecated options:');
    WriteLn(stdout, ' --set-video [screen width] [screen height] [color dept]');
    WriteLn(stdout, ' --set-audio [volume] [enable music] [enable sounds]');
    WriteLn(stdout, ' --set-other [language file] [full screen] [show FPS]');
    WriteLn(stdout, ' --set-multimedia [screen width] [screen height] [color dept] [volume] [enable music] [enable sounds] [language file] [full screen]');
    WriteLn(stdout, ' --set-everything [screen width] [screen height] [color dept] [volume] [enable music] [enable sounds] [language file] [full screen] [show FPS] [alternate damage] [timer value] [reduced quality]');
    WriteLn(stdout, '');
    WriteLn(stdout, 'For a more detailed help and examples go to:');
    WriteLn(stdout, 'http://code.google.com/p/hedgewars/wiki/CommandLineOptions');
end;

function getLongIntParameter(str:String; var paramIndex:LongInt; var wrongParameter:Boolean): LongInt;
var tmpInt, c: LongInt;
begin
    paramIndex:= paramIndex + 1;
    val(str, tmpInt, c);
    wrongParameter:= c <> 0;
    if wrongParameter then
        WriteLn(stderr, 'ERROR: '+ParamStr(paramIndex-1)+' expects a number, you passed "'+str+'"');
    getLongIntParameter:= tmpInt;
end;

function getStringParameter(str:String; var paramIndex:LongInt): String;
begin
    paramIndex:= paramIndex + 1;
    getStringParameter:= str;
end;

procedure parseClassicParameter(cmdArray: Array of String; size:LongInt; var paramIndex:LongInt); Forward;

function parseParameter(cmd:String; arg:String; var paramIndex:LongInt): Boolean;
const videoArray: Array [1..3] of String = ('--width','--height','--depth');
const audioArray: Array [1..3] of String = ('--volume','--nomusic','--nosound');
const otherArray: Array [1..3] of String = ('--locale','--fullscreen','--showfps');
const mediaArray: Array [1..8] of String = ('--width','--height','--depth','--volume','--nomusic','--nosound','--locale','--fullscreen');
const allArray: Array [1..12] of String = ('--width','--height','--depth','--volume','--nomusic','--nosound','--locale','--fullscreen','--showfps','--altdmg','--time','--lowquality');
begin
    parseParameter:= false;
    case cmd of
        '--locale'     : cLocaleFName   := getStringParameter (arg, paramIndex);
        '--width'      : cScreenWidth   := getLongIntParameter(arg, paramIndex, parseParameter);
        '--height'     : cScreenHeight  := getLongIntParameter(arg, paramIndex, parseParameter);
        '--depth'      : cBits          := getLongIntParameter(arg, paramIndex, parseParameter);
        '--time'       : cTimerInterval := getLongIntParameter(arg, paramIndex, parseParameter);
        '--volume'     : SetVolume       ( getLongIntParameter(arg, paramIndex, parseParameter) );
        '--nomusic'    : SetMusic        ( false );
        '--nosound'    : SetSound        ( false );
        '--fullscreen' : cFullScreen    := true;
        '--showfps'    : cShowFPS       := true;
        '--altdmg'     : cAltDamage     := true;
        '--lowquality' : cReducedQuality:= ($FFFFFFFF * getLongIntParameter(arg, paramIndex, parseParameter)) xor rqLowRes; //HACK!
        '--set-video'      : parseClassicParameter(videoArray,3,paramIndex);
        '--set-audio'      : parseClassicParameter(audioArray,3,paramIndex);
        '--set-other'      : parseClassicParameter(otherArray,3,paramIndex);
        '--set-multimedia' : parseClassicParameter(mediaArray,8,paramIndex);
        '--set-everything' : parseClassicParameter(allArray,12,paramIndex);
        '--stats-only' : begin
                         cOnlyStats:= true;
                         SetSound(false);
                         SetMusic(false);
                         cReducedQuality:= $FFFFFFFF xor rqLowRes;
                         end;
        '--gci' : begin            //     We had to make up all this saved space some how...     \\
                  WriteLn(stdout, '                                                                ');
                  WriteLn(stdout, '      /\\\\\\\\\\\\        /\\\\\\\\\  /\\\\\\\\\\\             ');
                  WriteLn(stdout, '     /\\\//////////      /\\\////////  \/////\\\///             ');
                  WriteLn(stdout, '     /\\\               /\\\/               \/\\\               ');
                  WriteLn(stdout, '     \/\\\    /\\\\\\\  /\\\                 \/\\\              ');
                  WriteLn(stdout, '      \/\\\   \/////\\\ \/\\\                 \/\\\             ');
                  WriteLn(stdout, '       \/\\\       \/\\\ \//\\\                \/\\\            ');
                  WriteLn(stdout, '        \/\\\       \/\\\  \///\\\              \/\\\           ');
                  WriteLn(stdout, '         \//\\\\\\\\\\\\/     \////\\\\\\\\\  /\\\\\\\\\\\      ');
                  WriteLn(stdout, '          \////////////           \/////////  \///////////      ');
                  WriteLn(stdout, '                                                                ');
                  WriteLn(stdout, ' Command Line Parser Implementation by a Google Code-In Student ');
                  WriteLn(stdout, '             ASCII Art easter egg idea by @sheepluva            ');
                  WriteLn(stdout, '                                                                ');
                  end;
        '--help' : begin
                   DisplayUsage();
                   GameType:= gmtSyntax;
                   end;
    else
        begin
        WriteLn(stderr, 'ERROR: '+cmd+' is not a valid argument');
        parseParameter:= true;
        end
    end;
end;

procedure parseClassicParameter(cmdArray: Array of String; size:LongInt; var paramIndex:LongInt);
var index, tmpInt: LongInt;
    isBool: Boolean;
begin
    index:= 0;
    tmpInt:= 1;
    while (index < size) do
        begin
        paramIndex:= paramIndex+1;
        //This next line is a really strange (but short), way to check if the parameter is a boolean one
        isBool:= true; case cmdArray[index] of '--nomusic':;'--nosound':;'--fullscreen':;'--showfps':;'--altdmg':;'--lowquality':; else isBool:= false; end;
        if (not isBool) or ((ParamStr(paramIndex)='1') and (cmdArray[index]<>'--nomusic') and (cmdArray[index]<>'--nosound')) then
            parseParameter(cmdArray[index], ParamStr(paramIndex), tmpInt);
        //if isBool then
        //  paramIndex:= paramIndex+1;
        index:= index+1;
        end;
end;

procedure playReplayFileWithParameters();
var paramIndex, tmpInt: LongInt;
    wrongParameter: boolean;
begin
    UserPathPrefix:= ParamStr(1);
    PathPrefix:= ParamStr(2);
    recordFileName:= ParamStr(3);
    paramIndex:= 4;
    wrongParameter:= false;
    while (paramIndex <= ParamCount) do
        begin
        if parseParameter( ParamStr(paramIndex), ParamStr(paramIndex+1), paramIndex) then
            wrongParameter:= true;
        paramIndex:= paramIndex+1;
        end;
    if wrongParameter = true then
        begin
        WriteLn(stderr, 'Please use --help to see possible arguments and their usage');
        GameType:= gmtSyntax;
        end
end;