fpchess: Fixes a crash and start implementing the telnet code

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1846 8e941d3f-bd1b-0410-a28a-d453659cc2b4

applications/fpchess/chessmodules.pas

@@ -6,7 +6,7 @@ interface
 
 uses
   Classes, SysUtils,
-  Controls,
+  Controls, StdCtrls,
   chessgame;
 
 type
@@ -28,7 +28,7 @@ type
 
 var
   gSelectedModuleIndex: Integer = -1;
-  gChessModulesDebugOutputDestiny: TStrings = nil;
+  gChessModulesDebugOutputDestiny: TMemo = nil;
 
 procedure RegisterChessModule(AModule: TChessModule);
 procedure PopulateChessModulesList(AList: TStrings);
@@ -84,7 +84,7 @@ end;
 procedure ChessModuleDebugLn(AStr: string);
 begin
   if Assigned(gChessModulesDebugOutputDestiny) then
-    gChessModulesDebugOutputDestiny.Add(AStr);
+    gChessModulesDebugOutputDestiny.Lines.Add(AStr);
 end;
 
 initialization

applications/fpchess/mainform.pas

@@ -173,7 +173,7 @@ begin
     UpdateChessModulesUI(0);
     gSelectedModuleIndex := 0;
   end;
-  gChessModulesDebugOutputDestiny := memoDebug.Lines;
+  gChessModulesDebugOutputDestiny := memoDebug;
 end;
 
 procedure TformChess.btnQuitClick(Sender: TObject);

applications/fpchess/mod_fics.pas

@@ -16,6 +16,7 @@ interface
 uses
   Classes, SysUtils,
   StdCtrls, Forms, Controls,
+  lTelnet,
   chessmodules, chessgame;
 
 type
@@ -25,7 +26,15 @@ type
   TFICSChessModule = class(TChessModule)
   public
     SecondPlayerName: string;
+    TelnetComm: TLTelnetClient;
+    FICS_HOST: string;
+    FICS_PORT: Integer;
+    FICS_USER: string;
+    FICS_PASSWORD: string;
+    // Frequency to issue commands to avoid disconnection, in miliseconds
+    PROTECT_LOGOUT_FREQ: Integer;
     constructor Create();
+    destructor Destroy; override;
     procedure CreateUserInterface(); override;
     procedure ShowUserInterface(AParent: TWinControl); override;
     procedure HideUserInterface(); override;
@@ -44,8 +53,28 @@ constructor TFICSChessModule.Create;
 begin
   inherited Create;
 
+  TelnetComm := TLTelnetClient.Create(nil);
+  (*    $telnet = new Net::Telnet(
+            Timeout => $OPEN_TIMEOUT,
+            Binmode => 1,
+            Errmode => 'die',
+           );*)
+
   Description := 'Play online via the Free Internet Chess Server';
   Kind := cmkSinglePlayer;
+
+  FICS_HOST := 'freechess.org';
+  FICS_PORT := 5000;
+  FICS_USER := 'BotTutorial';
+  FICS_PASSWORD := '';
+  PROTECT_LOGOUT_FREQ := 45 * 60 * 1000;
+end;
+
+destructor TFICSChessModule.Destroy;
+begin
+  TelnetComm.Free;
+
+  inherited Destroy;
 end;
 
 procedure TFICSChessModule.CreateUserInterface;
@@ -78,9 +107,83 @@ begin
 end;
 
 procedure TFICSChessModule.PrepareForGame;
+var
+  lResult: Boolean;
 begin
 //  SecondPlayerName := editSecondPlayerName.Text;
   ChessModuleDebugLn('[TFICSChessModule.PrepareForGame]');
+
+  //  Opening telnet connection. This is what happens when you issue telnet freechess.org 5000.
+
+  lResult := TelnetComm.Connect(FICS_HOST, FICS_PORT);
+
+  if not lResult then
+  begin
+    ChessModuleDebugLn('Failed to connect to FICS');
+    Exit;
+    //      print STDERR "\n" if $VERBOSE;
+  end;
+
+  ChessModuleDebugLn('Connected to FICS');
+
+  // If $FICS_PASSWORD is given, we peform normal full login (give username and password). FICS is standard enough to have Net::Telnet::login routine perform this process properly.
+  if FICS_PASSWORD <> '' then
+  begin
+    //$telnet->login(Name => $FICS_USER, Password => $FICS_PASSWORD);
+    //    $username = $FICS_USER;
+    // print STDERR "Successfully logged as user $FICS_USER\n" if $VERBOSE;
+  end
+  else
+  begin
+
+  end;
+
+(*
+
+  Now let's go to the guest login. Again, try logging to FICS via telnet as guest to understand what we are testing for here.
+      else {
+
+          $telnet->waitfor(
+              Match => '/login[: ]*$/i',
+              Match => '/username[: ]*$/i',
+              Timeout => $OPEN_TIMEOUT);
+
+              $telnet->print($FICS_USER);
+
+      ... and we send our username once prompted. Now we read obtained lines scanning for some patterns.
+              while (1) {
+                  my $line = $telnet->getline(Timeout => $LINE_WAIT_TIMEOUT);
+                  next if $line =~ /^[\s\r\n]*$/;
+                  if ($line =~ /Press return to enter/) {
+                      $telnet->print();
+                      last;
+                  }
+
+      Normal guest login here. We get Press return to enter suggestion and we do exactly that (we send empty line).
+                  if ($line =~ /("[^"]*" is a registered name|\S+ is already logged in)/) {
+                      die "Can not login as $FICS_USER: $1\n";
+                  }
+
+      Bad luck, we picked the name used by somebody, it is not possible to login as guest with this nick.
+                  print STDERR "Ignored line: $line\n" if $VERBOSE;
+              }
+
+      Developing-helper note and the end of loop. We get further after last breaks the loop above.
+              my($pre, $match) = $telnet->waitfor(
+                  Match => "/Starting FICS session as ([a-zA-Z0-9]+)/",
+                  Match => "/\\S+ is already logged in/",
+                  Timeout => $OPEN_TIMEOUT);
+              if ( $match =~ /Starting FICS session as ([a-zA-Z0-9]+)/ ) {
+                  $username = $1;
+              }
+              else {
+                  die "Can not login as $FICS_USER: $match\n";
+              }
+
+      After accepting guest login we may face two things. First, FICS may accept our login and send us a message like Starting FICS session as BotTutorial. This means everything is OK and we can go on. Alternatively, FICS may notice another guest using the same name, in such case it will tell us something like BotTutorial is already logged in and will disconnect.
+              print STDERR "Successfully logged as guest $username\n" if $VERBOSE;
+          }
+          *)
 end;
 
 function TFICSChessModule.IsMovingAllowedNow: Boolean;