// Created on: 1995-03-14
// Created by: Christian CAILLET
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _XSDRAW_HeaderFile
#define _XSDRAW_HeaderFile

#include <Standard.hxx>
#include <Standard_Handle.hxx>

#include <Draw_Interpretor.hxx>
#include <TColStd_HSequenceOfTransient.hxx>
#include <TopTools_HSequenceOfShape.hxx>
class IFSelect_SessionPilot;
class XSControl_WorkSession;
class XSControl_Controller;
class Interface_Protocol;
class Interface_InterfaceModel;
class Standard_Transient;
class Transfer_TransientProcess;
class Transfer_FinderProcess;
class XSControl_TransferReader;
class TCollection_AsciiString;
class XSDRAW_Functions;
class XSDRAW_Vars;


//! Basic package to work functions of X-STEP (IFSelect & Co)
//! under control of DRAW
//!
//! Works with some "static" data : a SessionPilot (used to run)
//! with its WorkSession and Model and TransferReader, a
//! FinderProcess
class XSDRAW 
{
 public:

  //! Takes variables to/from the DRAW session
  //! Implements ProgressIndicator for DRAW
  //! Changes the name under which a command of xstep is known by
  //! Draw. This allows to avoid collisions
  //! To be called before LoadDraw or any other xstep initialisation
  Standard_EXPORT static void ChangeCommand (const Standard_CString oldname, const Standard_CString newname);
  
  //! Removes a command from the interpretation list of Draw
  //! To be called before LoadDraw or any other xstep initialisation
  Standard_EXPORT static void RemoveCommand (const Standard_CString oldname);
  
  //! Defines the basic context to work with a X-STEP Session :
  //! it performs the basic inits, also records the Controller
  //! If the Controller is not yet set, it must be set after
  //! (call to SetController)
  //! LoadSession is called by LoadDraw
  //! Returns True the first time, False if already called
  Standard_EXPORT static Standard_Boolean LoadSession();
  
  //! Defines the context for using a X-STEP Session under DRAW
  //! Once the various INITs have been done, a call to LoadDraw
  //! records the defined commands for the X-STEP SessionPilot,
  //! into the DRAW interpretation list.
  //! "Set" commands are accessed under command xset
  //! SDS>xset name command ...
  //! Other commands can be accessed directly or under command xstep
  //! SDS>command ...  and  SDS>xstep command ...  are equivalent
  //!
  //! Only the command xinit is accessed directly only :
  //! SDS>xinit  (from the already defined Controller)
  //! SDS>xinit iges  (first defines the Controller as for "iges")
  //!
  //! It also records the function to be called by DRAW (not
  //! declared because specific).
  //! And it defines the context variables, i.e. a WorkSession, then
  //! it calls SetController with the currently defined Controller
  //! Remark : at least, the standard commands are recorded
  //!
  //! See also Controller : it is part of the Context, but it must
  //! be precised separately
  Standard_EXPORT static void LoadDraw (Draw_Interpretor& theCommands);
  
  //! Allows to execute a xstep-draw command from C++ program
  //! Fixed form :  Execute("command args...");
  //! Form with a variable text part : add %s for the variable :
  //! Execute ("command args %s args..",var)  [var is a CString]
  //! Returns the same value as returned by call from DRAW
  Standard_EXPORT static Standard_Integer Execute (const Standard_CString command, const Standard_CString var = "");
  
  //! Returns the SessionPilot (can be used for direct call)
  Standard_EXPORT static Handle(IFSelect_SessionPilot) Pilot();
  
  //! Returns the WorkSession defined in AddDraw (through Pilot)
  //! It is from XSControl, it brings functionnalities for Transfers
  Standard_EXPORT static Handle(XSControl_WorkSession) Session();
  
  //! Defines a Controller for the command "xinit" and applies it
  //! (i.e. calls its method Customise)
  Standard_EXPORT static void SetController (const Handle(XSControl_Controller)& control);
  
  //! Returns the Controller, a Null Handle if not yet defined
  Standard_EXPORT static Handle(XSControl_Controller) Controller();
  
  //! Sets a norm by its name (controller recorded as <normname> )
  //! Returns True if done, False if this norm is unknown
  Standard_EXPORT static Standard_Boolean SetNorm (const Standard_CString normname);
  
  //! Returns the actually defined Protocol
  Standard_EXPORT static Handle(Interface_Protocol) Protocol();
  
  //! Returns the Model of the Session (it is Session()->Model() )
  Standard_EXPORT static Handle(Interface_InterfaceModel) Model();
  
  //! Sets a Model in session (it is Session()->SetModel(model) )
  //! If <file> is defined, SetLoadedFile is also done
  Standard_EXPORT static void SetModel (const Handle(Interface_InterfaceModel)& model, const Standard_CString file = "");
  
  //! Produces a new model (from the Controller), can be Null
  //! Does not set it in the session
  Standard_EXPORT static Handle(Interface_InterfaceModel) NewModel();
  
  //! Returns the entity n0 <num> of the Model of the Session
  //! (it is StartingEntity)
  //! Null Handle if <num> is not suitable
  Standard_EXPORT static Handle(Standard_Transient) Entity (const Standard_Integer num);
  
  //! Returns the number of an entity in the Model (StartingNumber)
  //! 0 if <ent> unknown in the model, or null
  Standard_EXPORT static Standard_Integer Number (const Handle(Standard_Transient)& ent);
  
  //! Sets a TransferProcess in order to analyse it (see Activator)
  //! It can be either a FinderProcess or a TransientProcess, in
  //! that case a new TransferReader is created on it
  Standard_EXPORT static void SetTransferProcess (const Handle(Standard_Transient)& TP);
  
  //! Returns the TransferProcess : TransientProcess detained by
  //! the TransferReader
  Standard_EXPORT static Handle(Transfer_TransientProcess) TransientProcess();
  
  //! Returns the FinderProcess, detained by the TransferWriter
  Standard_EXPORT static Handle(Transfer_FinderProcess) FinderProcess();
  
  //! Initialises a TransferReader, according to mode :
  //! 0 nullifies it,  1 clears it (not nullify)
  //! 2 sets it with TransientProcess & Model
  //! 3 idem plus roots of TransientProcess
  //! Remark : called with 0 at least at each SetModel/NewModel
  Standard_EXPORT static void InitTransferReader (const Standard_Integer mode);
  
  //! Returns the current TransferReader, can be null
  //! It detains the TransientProcess
  Standard_EXPORT static Handle(XSControl_TransferReader) TransferReader();
  
  //! Takes the name of an entity, either as argument, or (if <name>
  //! is empty) on keybord, and returns the entity
  //! name can be a label or a number (in alphanumeric), it is
  //! searched by NumberFromLabel from WorkSession.
  //! If <name> doesn't match en entity, a Null Handle is returned
  Standard_EXPORT static Handle(Standard_Transient) GetEntity (const Standard_CString name = "");
  
  //! Same as GetEntity, but returns the number in the model of the
  //! entity. Returns 0 for null handle
  Standard_EXPORT static Standard_Integer GetEntityNumber (const Standard_CString name = "");
  
  //! Evaluates and returns a list of entity, from :
  //! keyboard if <first> and <second> are empty, see below
  //! first if second is empty : can be a number/label of an entity
  //! or the name of a selection to be evaluated (standard)
  //! first : name of a selection, evaluated from a list defined by
  //! second
  //! In case of failure, returns a Null Handle
  Standard_EXPORT static Handle(TColStd_HSequenceOfTransient) GetList (const Standard_CString first = "", const Standard_CString second = "");
  
  //! Analyses given file name and variable name, with a default
  //! name for variables. Returns resulting file name and variable
  //! name plus status "file to read"(True) or "already read"(False)
  //! In the latter case, empty resfile means no file available
  //!
  //! If <file> is null or empty or equates ".", considers Session
  //! and returned status is False
  //! Else, returns resfile = file and status is True
  //! If <var> is neither null nor empty, resvar = var
  //! Else, the root part of <resfile> is considered, if defined
  //! Else, <def> is taken
  Standard_EXPORT static Standard_Boolean FileAndVar (const Standard_CString file, const Standard_CString var, const Standard_CString def, TCollection_AsciiString& resfile, TCollection_AsciiString& resvar);
  
  //! Analyses a name as designating Shapes from DRAW variables or
  //! XSTEP transfer (last Transfer on Reading). <name> can be :
  //! "*" : all the root shapes produced by last Transfer (Read)
  //! i.e. considers roots of the TransientProcess
  //! a name : a name of a variable DRAW
  //!
  //! Returns the count of designated Shapes. Their list is put in
  //! <list>. If <list> is null, it is firstly created. Then it is
  //! completed (Append without Clear) by the Shapes found
  //! Returns 0 if no Shape could be found
  Standard_EXPORT static Standard_Integer MoreShapes (Handle(TopTools_HSequenceOfShape)& list, const Standard_CString name);
};

#endif // _XSDRAW_HeaderFile