//  SMESH SMESHGUI : GUI for SMESH component
//
//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
//  See http://www.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org
//
//
//
//  File   : SMESHGUI_SingleEditDlg.cxx
//  Author : Sergey LITONIN
//  Module : SMESH

#include "SMESHGUI_SingleEditDlg.h"

#include "SMESHGUI.h"
#include "SMESHGUI_Utils.h"
#include "SMESHGUI_VTKUtils.h"
#include "SMESHGUI_MeshUtils.h"
#include "SMESHGUI_SpinBox.h"

#include "SMESH_Actor.h"
#include "SMDS_Mesh.hxx"

#include "SalomeApp_SelectionMgr.h"
#include "SUIT_ResourceMgr.h"
#include "SUIT_MessageBox.h"
#include "SUIT_Desktop.h"

#include "SVTK_Selector.h"
#include "SVTK_ViewWindow.h"
#include "SALOME_ListIO.hxx"

#include "utilities.h"

// OCCT Includes
#include <TColStd_MapOfInteger.hxx>
#include <TColStd_IndexedMapOfInteger.hxx>

// QT Includes
#include <qframe.h>
#include <qlayout.h>
#include <qlineedit.h>
#include <qpushbutton.h>
#include <qgroupbox.h>
#include <qlabel.h>
#include <qmessagebox.h>
#include <qvalidator.h>


#define SPACING 5
#define MARGIN  10


/*!
 *  Class       : SMESHGUI_DiagValidator
 *  Description : validate munual input of edge like "id1-id2"
 */
class SMESHGUI_DiagValidator: public QValidator
{
 public:
  SMESHGUI_DiagValidator (QWidget * parent, const char * name = 0):
    QValidator(parent,name) {}

  State validate (QString & text, int & pos) const
  {
    text.stripWhiteSpace();
    text.replace(QRegExp("[^0-9]+"), "-");
    if (text == "-")
      text = "";
    int ind = text.find(QRegExp("-[0-9]+-"));
    if (ind > 0) { // leave only two ids
      ind = text.find('-', ind + 1);
      if (ind > 0)
        text.truncate(ind);
    }
    if (pos > text.length())
      pos = text.length();
    return Acceptable;
  }
};

/*!
 *  Class       : SMESHGUI_SingleEditDlg
 *  Description : Inversion of the diagonal of a pseudo-quadrangle formed by
 *                2 neighboring triangles with 1 common edge
 */

//=======================================================================
// name    : SMESHGUI_SingleEditDlg()
// Purpose : Constructor
//=======================================================================
SMESHGUI_SingleEditDlg
::SMESHGUI_SingleEditDlg(SMESHGUI* theModule, 
			 const char* theName):
  QDialog(SMESH::GetDesktop(theModule), 
	  theName, 
	  false, 
	  WStyle_Customize | WStyle_NormalBorder | WStyle_Title | WStyle_SysMenu),
    mySelector(SMESH::GetViewWindow(theModule)->GetSelector()),
    mySelectionMgr(SMESH::GetSelectionMgr(theModule)),
    myViewWindow(SMESH::GetViewWindow(theModule)),
    mySMESHGUI(theModule)
{
  QVBoxLayout* aDlgLay = new QVBoxLayout(this, MARGIN, SPACING);

  QFrame* aMainFrame = createMainFrame  (this);
  QFrame* aBtnFrame  = createButtonFrame(this);

  aDlgLay->addWidget(aMainFrame);
  aDlgLay->addWidget(aBtnFrame);

  aDlgLay->setStretchFactor(aMainFrame, 1);

  Init();
}

//=======================================================================
// name    : createMainFrame()
// Purpose : Create frame containing dialog's input fields
//=======================================================================
QFrame* SMESHGUI_SingleEditDlg::createMainFrame (QWidget* theParent)
{
  QGroupBox* aMainGrp = new QGroupBox(1, Qt::Vertical, tr("EDGE_BETWEEN"), theParent);

  QPixmap aPix (SMESH::GetResourceMgr( mySMESHGUI )->loadPixmap("SMESH", tr("ICON_SELECT")));

  new QLabel(tr("SMESH_EDGE"), aMainGrp);
  (new QPushButton(aMainGrp))->setPixmap(aPix);
  myEdge = new QLineEdit(aMainGrp);
  myEdge->setValidator(new SMESHGUI_DiagValidator(this, "validator"));

  return aMainGrp;
}

//=======================================================================
// name    : createButtonFrame()
// Purpose : Create frame containing buttons
//=======================================================================
QFrame* SMESHGUI_SingleEditDlg::createButtonFrame (QWidget* theParent)
{
  QFrame* aFrame = new QFrame(theParent);
  aFrame->setFrameStyle(QFrame::Box | QFrame::Sunken);

  myOkBtn     = new QPushButton(tr("SMESH_BUT_OK"   ), aFrame);
  myApplyBtn  = new QPushButton(tr("SMESH_BUT_APPLY"), aFrame);
  myCloseBtn  = new QPushButton(tr("SMESH_BUT_CLOSE"), aFrame);

  QSpacerItem* aSpacer = new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Minimum);

  QHBoxLayout* aLay = new QHBoxLayout(aFrame, MARGIN, SPACING);

  aLay->addWidget(myOkBtn);
  aLay->addWidget(myApplyBtn);
  aLay->addItem(aSpacer);
  aLay->addWidget(myCloseBtn);

  return aFrame;
}

//=======================================================================
// name    : isValid()
// Purpose : Verify validity of input data
//=======================================================================
bool SMESHGUI_SingleEditDlg::isValid (const bool theMess) const
{
  int id1, id2;
  return getNodeIds(myEdge->text(), id1, id2);
}

//=======================================================================
// name    : getNodeIds()
// Purpose : Retrieve node ids from string
//=======================================================================
bool SMESHGUI_SingleEditDlg::getNodeIds (const QString& theStr,
                                         int& theId1, int&  theId2) const
{
  if (!theStr.contains('-'))
    return false;

  bool ok1, ok2;
  QString str1 = theStr.section('-', 0, 0, QString::SectionSkipEmpty);
  QString str2 = theStr.section('-', 1, 1, QString::SectionSkipEmpty);
  theId1 = str1.toInt(&ok1);
  theId2 = str2.toInt(&ok2);

  return ok1 & ok2;
}

//=======================================================================
// name    : ~SMESHGUI_SingleEditDlg()
// Purpose : Destructor
//=======================================================================
SMESHGUI_SingleEditDlg::~SMESHGUI_SingleEditDlg()
{
}

//=======================================================================
// name    : Init()
// Purpose : Init dialog fields, connect signals and slots, show dialog
//=======================================================================
void SMESHGUI_SingleEditDlg::Init()
{
  mySMESHGUI->SetActiveDialogBox((QDialog*)this);
  myBusy = false;
  myActor = 0;

  // main buttons
  connect(myOkBtn,    SIGNAL(clicked()), SLOT(onOk()));
  connect(myCloseBtn, SIGNAL(clicked()), SLOT(onClose()));
  connect(myApplyBtn, SIGNAL(clicked()), SLOT(onApply()));

  // selection and SMESHGUI
  connect(mySelectionMgr, SIGNAL(currentSelectionChanged()), SLOT(onSelectionDone()));
  connect(mySMESHGUI, SIGNAL(SignalDeactivateActiveDialog()), SLOT(onDeactivate()));
  connect(mySMESHGUI, SIGNAL(SignalCloseAllDialogs()), SLOT(onClose()));
  connect(myEdge, SIGNAL(textChanged(const QString&)), SLOT(onTextChange(const QString&)));

  myOkBtn->setEnabled(false);
  myApplyBtn->setEnabled(false);
  setEnabled(true);

  int x, y;
  mySMESHGUI->DefineDlgPosition(this, x, y);
  this->move(x, y);
  this->show();

  // set selection mode
  myViewWindow->SetSelectionMode(EdgeOfCellSelection);

  onSelectionDone();
}

//=======================================================================
// name    : onOk()
// Purpose : SLOT called when "Ok" button pressed.
//           Assign filters VTK viewer and close dialog
//=======================================================================
void SMESHGUI_SingleEditDlg::onOk()
{
  if (onApply())
    onClose();
}

//=======================================================================
// name    : onClose()
// Purpose : SLOT called when "Close" button pressed. Close dialog
//=======================================================================
void SMESHGUI_SingleEditDlg::onClose()
{
  myViewWindow->SetSelectionMode(ActorSelection);
  mySelectionMgr->clearSelected();
  disconnect(mySelectionMgr, 0, this, 0);
  disconnect(mySMESHGUI, 0, this, 0);
  mySMESHGUI->ResetState();
  reject();
}

//=======================================================================
//function : findTriangles()
//purpose  : find triangles sharing theNode1-theNode2 link
//           THIS IS A PIECE OF SMESH_MeshEditor.cxx
//           TO DO: make it available in SMDS for ex.
//=======================================================================
static bool findTriangles (const SMDS_MeshNode *    theNode1,
                           const SMDS_MeshNode *    theNode2,
                           const SMDS_MeshElement*& theTria1,
                           const SMDS_MeshElement*& theTria2)
{
  if (!theNode1 || !theNode2) return false;

  theTria1 = theTria2 = 0;

  set< const SMDS_MeshElement* > emap;
  SMDS_ElemIteratorPtr it = theNode1->GetInverseElementIterator();
  while (it->more()) {
    const SMDS_MeshElement* elem = it->next();
    if (elem->GetType() == SMDSAbs_Face && elem->NbNodes() == 3)
      emap.insert(elem);
  }
  it = theNode2->GetInverseElementIterator();
  while (it->more()) {
    const SMDS_MeshElement* elem = it->next();
    if (elem->GetType() == SMDSAbs_Face &&
         emap.find(elem) != emap.end())
      if (theTria1) {
        theTria2 = elem;
        break;
      } else {
        theTria1 = elem;
      }
  }
  return (theTria1 && theTria2);
}

//=======================================================================
//function : onTextChange()
//purpose  :
//=======================================================================
void SMESHGUI_SingleEditDlg::onTextChange (const QString& theNewText)
{
  if (myBusy) return;

  myOkBtn->setEnabled(false);
  myApplyBtn->setEnabled(false);

  // hilight entered edge
  if(myActor){
    if(SMDS_Mesh* aMesh = myActor->GetObject()->GetMesh()){
      myBusy = true; // block onSelectionDone()
      Handle(SALOME_InteractiveObject) anIO = myActor->getIO();
      SALOME_ListIO aList;
      aList.Append(anIO);
      mySelectionMgr->setSelectedObjects(aList,false);
      
      TColStd_IndexedMapOfInteger selectedIndices;
      TColStd_MapOfInteger newIndices;
      mySelector->GetIndex(anIO,selectedIndices);
      myBusy = false;

      QStringList aListId = QStringList::split("-", theNewText, false);
      if (aListId.count() != 2)
	return;

      int i;
      bool allOk = true;
      const SMDS_MeshNode* a2Nodes[2];
      for (i = 0; i < aListId.count(); i++) {
	if(const SMDS_MeshNode *aNode = aMesh->FindNode(aListId[ i ].toInt()))
	  a2Nodes[ i ] = aNode;
	else
	  allOk = false;
      }
      
      // find a triangle and an edge nb
      const SMDS_MeshElement* tria[2];
      allOk &= a2Nodes[0] != a2Nodes[1] && findTriangles(a2Nodes[0],a2Nodes[1],tria[0],tria[1]);
      if(allOk){
	myBusy = true; // block onSelectionDone()
	newIndices.Add(tria[0]->GetID());
	mySelector->AddOrRemoveIndex(anIO,newIndices, true);

	const SMDS_MeshNode* a3Nodes [3];
	SMDS_ElemIteratorPtr it;
	int edgeInd = 2;
	for (i = 0, it = tria[0]->nodesIterator(); it->more(); i++) {
	  a3Nodes[ i ] = static_cast<const SMDS_MeshNode*>(it->next());
	  if (i > 0) {
	    allOk = (a3Nodes[ i ] == a2Nodes[ 0 ] && a3Nodes[ i - 1] == a2Nodes[ 1 ]) ||
	      (a3Nodes[ i ] == a2Nodes[ 1 ] && a3Nodes[ i - 1] == a2Nodes[ 0 ]);
	    if (allOk) {
	      edgeInd = i - 1;
	      break;
	    }
	  }
	}

	newIndices.Clear();
	newIndices.Add(-edgeInd-1);
	mySelector->AddOrRemoveIndex(anIO,newIndices,true);
	myBusy = false;
	
	myOkBtn->setEnabled(true);
	myApplyBtn->setEnabled(true);
      }
    }
  }
}

//=======================================================================
// name    : onSelectionDone()
// Purpose : SLOT called when selection changed
//=======================================================================
void SMESHGUI_SingleEditDlg::onSelectionDone()
{
  if (myBusy) return;

  int anId1 = 0, anId2 = 0;

  myOkBtn->setEnabled(false);
  myApplyBtn->setEnabled(false);

  SALOME_ListIO aList;
  mySelectionMgr->selectedObjects(aList);

  if (aList.Extent() != 1) {
    myEdge->clear();
    return;
  }

  Handle(SALOME_InteractiveObject) anIO = aList.First();
  myActor = SMESH::FindActorByEntry(anIO->getEntry());
  if(myActor){
    TVisualObjPtr aVisualObj = myActor->GetObject();
    if(SMDS_Mesh* aMesh = aVisualObj->GetMesh()){
      if(SMESH::GetEdgeNodes(mySelector, aVisualObj, anId1, anId2) >= 1){
	QString aText = QString("%1-%2").arg(anId1).arg(anId2);
	myBusy = true;
	myEdge->setText(aText);
	myBusy = false;
	
	const SMDS_MeshElement* tria[2];
	if (findTriangles(aMesh->FindNode(anId1), aMesh->FindNode(anId2), tria[0],tria[1])) {
	  myOkBtn->setEnabled(true);
	  myApplyBtn->setEnabled(true);
	}
      } else {
	myEdge->clear();
      }
    }
  }
}

//=======================================================================
// name    : onDeactivate()
// Purpose : SLOT called when dialog must be deativated
//=======================================================================
void SMESHGUI_SingleEditDlg::onDeactivate()
{
  setEnabled(false);
}

//=======================================================================
// name    : enterEvent()
// Purpose : Event filter
//=======================================================================
void SMESHGUI_SingleEditDlg::enterEvent (QEvent*)
{
  if (!isEnabled()) {
    mySMESHGUI->EmitSignalDeactivateDialog();
    myViewWindow->SetSelectionMode(EdgeOfCellSelection);
    setEnabled(true);
  }
}

//=================================================================================
// function : closeEvent()
// purpose  :
//=================================================================================
void SMESHGUI_SingleEditDlg::closeEvent (QCloseEvent*)
{
  onClose();
}

//=======================================================================
//function : hideEvent()
//purpose  : caused by ESC key
//=======================================================================
void SMESHGUI_SingleEditDlg::hideEvent (QHideEvent*)
{
  if (!isMinimized())
    onClose();
}

//=================================================================================
// function : onApply()
// purpose  : SLOT. Called when apply button is pressed
//=================================================================================
bool SMESHGUI_SingleEditDlg::onApply()
{
  if (mySMESHGUI->isActiveStudyLocked())
    return false;
  // verify validity of input data
  if (!isValid(true))
    return false;

  // get mesh, actor and nodes
  SALOME_ListIO aList;
  mySelectionMgr->selectedObjects(aList);

  SMESH::SMESH_Mesh_var aMesh = SMESH::GetMeshByIO(aList.First());

  if (aMesh->_is_nil()) {
    SUIT_MessageBox::info1(SMESH::GetDesktop(mySMESHGUI), 
			   tr("SMESH_ERROR"),
			   tr("SMESHG_NO_MESH"), 
			   tr("SMESH_BUT_OK"));
    return false;
  }

  SMESH::SMESH_MeshEditor_var aMeshEditor = aMesh->GetMeshEditor();
  int anId1= 0, anId2 = 0;
  if (aMeshEditor->_is_nil() || !getNodeIds(myEdge->text(), anId1, anId2))
    return false;

  // perform operation
  bool aResult = process(aMeshEditor.in(), anId1, anId2);

  // update actor
  if (aResult) {
    mySelectionMgr->setSelectedObjects(aList, false);
    SMESH::UpdateView();
  }

  return aResult;
}

/*!
 *  Class       : SMESHGUI_TrianglesInversionDlg
 *  Description : Inversion of the diagonal of a pseudo-quadrangle formed by
 *                2 neighboring triangles with 1 common edge
 */

SMESHGUI_TrianglesInversionDlg
::SMESHGUI_TrianglesInversionDlg(SMESHGUI* theModule, 
				 const char* theName)
: SMESHGUI_SingleEditDlg(theModule,theName)
{
  setCaption(tr("CAPTION"));
}

SMESHGUI_TrianglesInversionDlg::~SMESHGUI_TrianglesInversionDlg()
{
}

bool SMESHGUI_TrianglesInversionDlg::process (SMESH::SMESH_MeshEditor_ptr theMeshEditor,
                                              const int theId1, const int theId2)
{
  return theMeshEditor->InverseDiag(theId1, theId2);
}

/*!
 *  Class       : SMESHGUI_UnionOfTwoTrianglesDlg
 *  Description : Construction of a quadrangle by deletion of the
 *                common border of 2 neighboring triangles
 */

SMESHGUI_UnionOfTwoTrianglesDlg
::SMESHGUI_UnionOfTwoTrianglesDlg(SMESHGUI* theModule, 
				  const char* theName)
: SMESHGUI_SingleEditDlg(theModule,theName)
{
  setCaption(tr("CAPTION"));
}

SMESHGUI_UnionOfTwoTrianglesDlg::~SMESHGUI_UnionOfTwoTrianglesDlg()
{
}

bool SMESHGUI_UnionOfTwoTrianglesDlg::process (SMESH::SMESH_MeshEditor_ptr theMeshEditor,
                                               const int theId1, const int theId2)
{
  return theMeshEditor->DeleteDiag(theId1, theId2);
}