// Created on: 2004-11-23
// Created by: Pavel TELKOV
// Copyright (c) 2004-2014 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.

// The original implementation Copyright: (C) RINA S.p.A

#ifndef TObj_Model_HeaderFile
#define TObj_Model_HeaderFile

#include "Message_Messenger.hxx"
#include "TObj_Partition.hxx"
#include "TCollection_ExtendedString.hxx"

class TObj_TNameContainer;
class TCollection_HExtendedString;
class TDocStd_Document;
class TObj_CheckModel;
class TObj_Application;

/**
 * Base class for OCAF based models.
 * Defines common behaviour for all models based on TObject
 * classes, basic services to access model objects and common
 * operations with the model.
 * Provides default implementation for many methods.
 */

class TObj_Model : public Standard_Transient
{
protected:
  //! Model may store some data on the data labels of its main partition
  //! See TObj_Object for
  enum DataTag
  {
    DataTag_FormatVersion = TObj_Partition::DataTag_Last,
    DataTag_Last
  };

protected:
  /**
   * Constructors and Persistence
   */

  //! Empty constructor
  Standard_EXPORT TObj_Model();

  //! Destructor closes the model
  Standard_EXPORT ~TObj_Model() override;

  //! Check whether the document contains the OCAF data.
  Standard_EXPORT virtual bool checkDocumentEmpty(const TCollection_ExtendedString& theFile);

public:
  /**
   * Messages mechanism
   */

  //! Set messenger to use for messages output
  void SetMessenger(const occ::handle<Message_Messenger>& theMsgr) { myMessenger = theMsgr; }

  //! Get messenger used for messages output (by default, the messenger from
  //! application is used)
  occ::handle<Message_Messenger> Messenger() const { return myMessenger; }

public:
  /**
   * Implementation of Load/Save for OCAF based models
   */

  //! Load the OCAF model from a file. If the filename is empty or file does
  //! not exists, it just initializes model by empty data.
  Standard_EXPORT virtual bool Load(const TCollection_ExtendedString& theFile);

  //! Load the OCAF model from a stream. If case of failure,
  //! it initializes the model by empty data.
  Standard_EXPORT virtual bool Load(Standard_IStream& theIStream);

  //! Save the model to a file
  Standard_EXPORT virtual bool SaveAs(const TCollection_ExtendedString& theFile);

  //! Save the model to a stream
  Standard_EXPORT virtual bool SaveAs(Standard_OStream& theOStream);

  //! Save the model to the same file
  Standard_EXPORT bool Save();

public:
  /**
   * Work with document
   */

  //! Close the model
  virtual Standard_EXPORT bool Close();

  //! Close Free OCAF document
  Standard_EXPORT void CloseDocument(const occ::handle<TDocStd_Document>& theDoc);

  //! Returns model which contains a document with the label,
  //! or NULL handle if label is NULL
  static Standard_EXPORT occ::handle<TObj_Model> GetDocumentModel(const TDF_Label& theLabel);

  //! Returns the full file name this model is to be saved to,
  //! or null if the model was not saved yet
  virtual Standard_EXPORT occ::handle<TCollection_HExtendedString> GetFile() const;

public:
  /**
   * Access to the objects in the model
   */

  //! Returns an Iterator on all objects in the Model
  virtual Standard_EXPORT occ::handle<TObj_ObjectIterator> GetObjects() const;

  //! Returns an Iterator on objects in the main partition
  virtual Standard_EXPORT occ::handle<TObj_ObjectIterator> GetChildren() const;

  //! Returns an Object by given Name (or Null if not found).
  virtual Standard_EXPORT occ::handle<TObj_Object> FindObject(
    const occ::handle<TCollection_HExtendedString>& theName,
    const occ::handle<TObj_TNameContainer>&         theDictionary) const;

  //! Returns the tool checking model consistency.
  //! Descendant may redefine it to return its own tool.
  virtual Standard_EXPORT occ::handle<TObj_CheckModel> GetChecker() const;

public:
  /**
   * Methods for iteration on the model
   */

  //! Returns root object of model
  virtual Standard_EXPORT occ::handle<TObj_Object> GetRoot() const;

  //! Returns root object of model
  Standard_EXPORT occ::handle<TObj_Partition> GetMainPartition() const;

public:
  /**
   * OCAF methods
   */

  //! Returns OCAF label on which model data are stored.
  TDF_Label GetLabel() const { return myLabel; }

public:
  /**
   * Methods for supporting unique naming of the objects in model
   */

  //! Returns the name of the model
  virtual Standard_EXPORT occ::handle<TCollection_HExtendedString> GetModelName() const;

  //! Sets new unique name for the object
  static Standard_EXPORT void SetNewName(const occ::handle<TObj_Object>& theObject);

  //! Returns True is name is registered in the names map
  //! The input argument may be NULL handle, then model check in own global container
  Standard_EXPORT bool IsRegisteredName(
    const occ::handle<TCollection_HExtendedString>& theName,
    const occ::handle<TObj_TNameContainer>&         theDictionary) const;

  //! Register name in the map
  //! The input argument may be NULL handle, then model check in own global container
  Standard_EXPORT void RegisterName(const occ::handle<TCollection_HExtendedString>& theName,
                                    const TDF_Label&                                theLabel,
                                    const occ::handle<TObj_TNameContainer>& theDictionary) const;

  //! Unregisters name from the map
  //! The input argument may be NULL handle, then model check in own global container
  Standard_EXPORT void UnRegisterName(const occ::handle<TCollection_HExtendedString>& theName,
                                      const occ::handle<TObj_TNameContainer>& theDictionary) const;

public:
  /**
   * API for transaction mechanism
   */

  //! Returns True if a Command transaction is open
  //! Starting, finishing the transaction
  Standard_EXPORT bool HasOpenCommand() const;

  //! Open a new command transaction.
  Standard_EXPORT void OpenCommand() const;

  //! Commit the Command transaction. Do nothing If there is no Command
  //! transaction open.
  Standard_EXPORT void CommitCommand() const;

  //! Abort the Command transaction. Do nothing If there is no Command
  //! transaction open.
  Standard_EXPORT void AbortCommand() const;

  //! Modification status
  virtual Standard_EXPORT bool IsModified() const;

  //! Sets modification status
  Standard_EXPORT void SetModified(const bool theModified);

public:
  /**
   * Methods for obtaining application
   */

  //! Returns handle to static instance of the relevant application class
  virtual Standard_EXPORT const occ::handle<TObj_Application> GetApplication();

public:
  /**
   * Methods for obtaining the version of Format
   */

  //! Returns the format for save/restore.
  //! This implementation returns "BinOcaf". The method should be redefined
  //! for those models that should use another format.
  virtual Standard_EXPORT TCollection_ExtendedString GetFormat() const;

  //! Returns the version of format stored in TObj file
  Standard_EXPORT int GetFormatVersion() const;

protected:
  /**
   * Methods for handling the version of the Format
   */

  //! Sets the format version to save
  Standard_EXPORT void SetFormatVersion(const int theVersion);

public:
  /**
   * Methods for updating model
   */

  //! this method is called before activating this model
  virtual Standard_EXPORT bool Update();

public:
  /**
   * Definition of interface GUID
   */

  //! Defines interface GUID for TObj_Model
  virtual Standard_EXPORT Standard_GUID GetGUID() const;

public:
  /**
   * Internal methods
   */

  //! Returns the map of names of the objects
  Standard_EXPORT occ::handle<TObj_TNameContainer> GetDictionary() const;

protected:
  /**
   * Internal methods
   */

  //! Returns (or creates a new) partition on a given label
  Standard_EXPORT occ::handle<TObj_Partition> getPartition(const TDF_Label& theLabel,
                                                           const bool theHidden = false) const;

  //! Returns Partition specified by its index number on a given label
  //! If not exists, creates anew with specified name
  Standard_EXPORT occ::handle<TObj_Partition> getPartition(
    const TDF_Label&                  theLabel,
    const int                         theIndex,
    const TCollection_ExtendedString& theName,
    const bool                        theHidden = false) const;

  //! Returns Partition specified by its index number
  //! If not exists, creates anew with specified name
  Standard_EXPORT occ::handle<TObj_Partition> getPartition(
    const int                         theIndex,
    const TCollection_ExtendedString& theName,
    const bool                        theHidden = false) const;

public:
  //! Returns OCAF document of Model
  Standard_EXPORT occ::handle<TDocStd_Document> GetDocument() const;

protected:
  // all that labels is sublabels of main partition

  //! Returns the labels under which the data is stored.
  //! the data stored from the third sublabel of this one.
  Standard_EXPORT TDF_Label GetDataLabel() const;

public:
  //! Sets OCAF label on which model data are stored.
  //! Used by persistence mechanism.
  void SetLabel(const TDF_Label& theLabel) { myLabel = theLabel; }

protected:
  //! Do the necessary initialisations after creation of a new model.
  //! This function is called by LoadModel after creation of OCAF document
  //! and setting myModel on its main label.
  //! Default implementation does nothing.
  //! Returns True is model sucsesfully initialized
  virtual Standard_EXPORT bool initNewModel(const bool IsNew);

  //! Updates back references of object
  //! Recursive method.
  virtual Standard_EXPORT void updateBackReferences(const occ::handle<TObj_Object>& theObject);

  //! Returns boolean value is to check model in Init new model
  //! The check could be useful if version of model changed
  //! Default implementation returns FALSE (check turned OFF)
  virtual bool isToCheck() const { return true; }

public:
  /**
   * Methods for clone model
   */

  //! Pastes me to the new model
  //! references will not be copied if theRelocTable is not 0
  //! if theRelocTable is not NULL theRelocTable is filled by objects
  virtual Standard_EXPORT bool Paste(occ::handle<TObj_Model>          theModel,
                                     occ::handle<TDF_RelocationTable> theRelocTable = nullptr);

  //! This function have to create a new model with type like me
  virtual Standard_EXPORT occ::handle<TObj_Model> NewEmpty() = 0;

  //! Copy references from me to the other
  Standard_EXPORT void CopyReferences(const occ::handle<TObj_Model>&          theTarget,
                                      const occ::handle<TDF_RelocationTable>& theRelocTable);

private:
  /**
   * Fields
   */

  TDF_Label                      myLabel;     //!< Root label of the model in OCAF document
  occ::handle<Message_Messenger> myMessenger; //!< Messenger object

public:
  //! CASCADE RTTI
  DEFINE_STANDARD_RTTIEXT(TObj_Model, Standard_Transient)
};

//! The Model Handle is defined in a separate header file

#endif