{
    This file is part of the ffff
    Copyright (c) 1998 by Berczi Gabor

    Help menu entries

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    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.

 **********************************************************************}

procedure TIDEApp.HelpContents;
var FileID: word;
    Ctx   : THelpCtx;
var Found: boolean;
begin
  CheckHelpSystem;
  Found:=HelpFacility^.TopicSearch('Table of contents',FileID,Ctx);
  if Found then
     Help(FileID,Ctx,false)
  else
     HelpIndex('');
end;

procedure TIDEApp.HelpHelpIndex;
begin
  HelpIndex('');
end;

procedure TIDEApp.HelpTopicSearch;
var FileID: word;
    Ctx   : THelpCtx;
var Found: boolean;
var
    EditorWindow : PSourceWindow;
    S : string;
begin
  EditorWindow:=FirstEditorWindow;
  If assigned(EditorWindow) then
    S:=LowerCaseStr(EditorWindow^.Editor^.GetCurrentWord)
  else
    S:='';
  CheckHelpSystem;
  Found:=false;
  if S<>'' then
    Found:=HelpFacility^.TopicSearch(S,FileID,Ctx);
  if Found then
     Help(FileID,Ctx,false)
  else
     HelpIndex('');
end;


procedure TIDEApp.HelpPrevTopic;
begin
  if HelpWindow=nil then HelpContents else
  with HelpWindow^ do
  if GetState(sfVisible) then Message(HelpWindow^.HelpView,evCommand,cmPrevTopic,nil)
     else begin HelpWindow^.Show; HelpWindow^.MakeFirst; end;
end;

procedure TIDEApp.HelpUsingHelp;
begin
  Help(0,hcUsingHelp,false);
end;

type
    PHelpFileListBox = ^THelpFileListBox;
    THelpFileListBox = object(TListBox)
      function GetText(Item: sw_Integer; MaxLen: sw_Integer): String; virtual;
    end;

    PHelpFilesDialog = ^THelpFilesDialog;
    THelpFilesDialog = object(TCenterDialog)
      constructor Init;
      procedure   HandleEvent(var Event: TEvent); virtual;
      destructor  Done; virtual;
    private
      LB: PHelpFileListBox;
      C : PUnsortedStringCollection;
    end;

function THelpFileListBox.GetText(Item: sw_Integer; MaxLen: sw_Integer): String;
var S: string;
    P: integer;
begin
  S:=inherited GetText(Item,MaxLen);
  P:=Pos('|',S);
  if P>0 then S:=copy(S,P+1,255)+' - '+copy(S,1,P-1);
  GetText:=copy(S,1,MaxLen);
end;

constructor THelpFilesDialog.Init;
var R,R2: TRect;
    SB: PScrollBar;
    I: integer;
begin
  R.Assign(0,0,round(ScreenWidth*5/8),ScreenHeight-10);
  inherited Init(R, dialog_helpfiles);

  New(C, Init(20,10));

  GetExtent(R); R.Grow(-2,-2); Inc(R.A.Y); R.B.X:=R.B.X-13;
  R2.Copy(R); R2.Move(1,0); R2.A.X:=R2.B.X-1;
  New(SB, Init(R2)); Insert(SB);
  New(LB, Init(R, 1, SB));

  for I:=0 to HelpFiles^.Count-1 do
    begin
      C^.Insert(NewStr(HelpFiles^.At(I)^));
    end;

  LB^.NewList(C);
  Insert(LB);
  R2.Copy(R); Dec(R2.A.Y); R2.B.Y:=R2.A.Y+1;
  Insert(New(PLabel, Init(R2, label_helpfiles_helpfiles, LB)));

  GetExtent(R); R.Grow(-2,-2); Inc(R.A.Y); R.A.X:=R.B.X-13+1; R.B.Y:=R.A.Y+2;
  Insert(New(PButton, Init(R, button_OK, cmOK, bfDefault)));
  R.Move(0,2);
  Insert(New(PButton, Init(R, button_New, cmAddItem, bfNormal)));
  R.Move(0,2);
  Insert(New(PButton, Init(R, button_Delete, cmDeleteItem, bfNormal)));
  R.Move(0,2);
  Insert(New(PButton, Init(R, button_Cancel, cmCancel, bfNormal)));

  LB^.Select;
end;

procedure THelpFilesDialog.HandleEvent(var Event: TEvent);
  function StoreHtmlIndexFile(const FileName: string; LS: PFPHTMLFileLinkScanner;var Re: Word; SilentFails: Boolean): Boolean;
  var
    BS: PBufStream;
  begin
    if ExistsFile(FileName) then
      if ConfirmBox(FormatStrStr(msg_filealreadyexistsoverwrite,FileName),nil,true)<>cmYes then
        Re:=cmCancel;
    if Re<>cmCancel then
    begin
      PushStatus(FormatStrStr(msg_storinghtmlindexinfile,FileName));
      New(BS, Init(FileName, stCreate, 4096));
      if Assigned(BS)=false then
        begin
          if not SilentFails then
          begin
            ErrorBox(FormatStrStr(msg_cantcreatefile,FileName),nil);
          end;
          Re:=cmCancel;
        end
      else
        begin
          LS^.StoreDocuments(BS^);
          if BS^.Status<>stOK then
            begin
              if not SilentFails then
              begin
                ErrorBox(FormatStrInt(msg_errorstoringindexdata,BS^.Status),nil);
              end;
              Re:=cmCancel;
            end;
          Dispose(BS, Done);
        end;
      PopStatus;
    end;
  StoreHtmlIndexFile := Re <> cmCancel;
  end;
var I: integer;
    D: PFileDialog;
    FileName: string;
    Re: word;
    S: string;
    LS: PFPHTMLFileLinkScanner;
begin
  case Event.What of
    evKeyDown :
      case Event.KeyCode of
        kbIns :
          begin
            Message(@Self,evCommand,cmAddItem,nil);
            ClearEvent(Event);
          end;
        kbDel :
          begin
            Message(@Self,evCommand,cmDeleteItem,nil);
            ClearEvent(Event);
          end;
      end;
    evCommand :
      case Event.Command of
        cmAddItem :
          begin
            S:='';
            New(D, Init(HelpFileExts,
              dialog_installhelpfile,
              label_installhelpfile_filename,
              fdOpenButton,hidOpenHelpFile));
            Re:=Desktop^.ExecView(D);
            if Re<>cmCancel then
            begin
              D^.GetFileName(FileName);
              if UpcaseStr(ExtOf(FileName))=UpcaseStr(HTMLIndexExt) then
                begin
                  S:='HTML Index';
                end
              else
              if UpcaseStr(copy(ExtOf(FileName),1,length(HTMLExt)))=UpcaseStr(HTMLExt) then
              begin
                Re:=ConfirmBox(msg_createkeywordindexforhelpfile,nil,true);
                if Re<>cmCancel then
                if Re=cmNo then
                  Re:=InputBox(dialog_topictitle,label_topictitle_title,S,40)
                else
                  begin
                    ShowMessage(msg_pleasewaitwhilecreatingindex);
                    S:='HTML Index';
                    PushStatus(FormatStrStr(msg_buildingindexfile,FileName));
                    New(LS, Init(DirOf(FileName)));
                    LS^.ProcessDocument(FileName,[soSubDocsOnly]);
                    if LS^.GetDocumentCount=0 then
                      begin
                        ErrorBox(FormatStrStr(msg_filedoesnotcontainanylinks,FileName),nil);
                        Re:=cmCancel;
                      end
                    else
                      begin
                        FileName:=DirAndNameOf(FileName)+HTMLIndexExt;
                        if not StoreHtmlIndexFile(FileName, LS, Re, True) then
                        begin
                          Re:=ConfirmBox(FormatStrStr('Could not create "%s", try creating it in local dir?', FileName),nil,true);
                          FileName := GetCurDir + NameAndExtOf(FileName);
                          if Re = cmYes then
                          begin
                            StoreHtmlIndexFile(FileName, LS, Re, False);
                          end;
                        end
                      end;
                    Dispose(LS, Done);
                    PopStatus;
                    HideMessage;
                  end;
              end;
            end;
            if Re<>cmCancel then
            begin
              if S<>'' then FileName:=FileName+'|'+S;
              LB^.List^.Insert(NewStr(FileName));
              LB^.SetRange(LB^.List^.Count);
              ReDraw;
            end;
            Dispose(D, Done);
            ClearEvent(Event);
          end;
        cmDeleteItem :
          if LB^.Range>0 then
          begin
            LB^.List^.AtFree(LB^.Focused);
            LB^.SetRange(LB^.List^.Count);
            ReDraw;
            ClearEvent(Event);
          end;
        cmOK :
          begin
            HelpFiles^.FreeAll;
            for I:=0 to LB^.List^.Count-1 do
              HelpFiles^.Insert(NewStr(C^.At(I)^));
          end;
      end;
  end;
  inherited HandleEvent(Event);
end;

destructor THelpFilesDialog.Done;
begin
  if C<>nil then
    begin
      C^.FreeAll;
      Dispose(C, Done);
    end;
  inherited Done;
end;

procedure TIDEApp.HelpFiles;
var
  PHFD : PHelpFilesDialog;
begin
  New(PHFD, Init);
  if Desktop^.ExecView(PHFD)=cmOK then
  begin
    DoneHelpSystem;
    Message(Application,evBroadcast,cmHelpFilesChanged,nil);
    InitHelpSystem;
  end;
  if assigned(PHFD) then
    Dispose(PHFD, Done);
end;

procedure TIDEApp.About;
begin
  ExecuteDialog(New(PFPAboutDialog, Init), nil);
end;