// Created on: 2017-06-16
// Created by: Natalia ERMOLAEVA
// Copyright (c) 2017 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. 

#include <inspector/TreeModel_ModelBase.hxx>

#include <inspector/TreeModel_ItemBase.hxx>
#include <inspector/TreeModel_ItemProperties.hxx>
#include <inspector/TreeModel_Tools.hxx>
#include <inspector/TreeModel_VisibilityState.hxx>

#include <Standard_Transient.hxx>

#include <Standard_WarningsDisable.hxx>
#include <QIcon>
#include <Standard_WarningsRestore.hxx>

const int COLUMN_NAME_WIDTH = 260;
const int COLUMN_SIZE_WIDTH = 30;

// =======================================================================
// function : Constructor
// purpose :
// =======================================================================
TreeModel_ModelBase::TreeModel_ModelBase (QObject* theParent)
: QAbstractItemModel (theParent), m_pUseVisibilityColumn (false),
  myVisibilityState (0)
{
  myVisibleIcon = QIcon (":/icons/item_visible.png");
  myInvisibleIcon = QIcon (":/icons/item_invisible.png");
}

// =======================================================================
// function :  InitColumns
// purpose :
// =======================================================================
void TreeModel_ModelBase::InitColumns()
{
  setHeaderItem (TreeModel_ColumnType_Name,       TreeModel_HeaderSection ("Name", COLUMN_NAME_WIDTH));
  setHeaderItem (TreeModel_ColumnType_Visibility, TreeModel_HeaderSection ("Visibility", TreeModel_ModelBase::ColumnVisibilityWidth()));
  setHeaderItem (TreeModel_ColumnType_Row,        TreeModel_HeaderSection ("Row", COLUMN_SIZE_WIDTH));
}

// =======================================================================
// function :  GetItemByIndex
// purpose :
// =======================================================================
TreeModel_ItemBasePtr TreeModel_ModelBase::GetItemByIndex (const QModelIndex& theIndex)
{
  TreeModel_ItemBase* anItem = (TreeModel_ItemBase*)theIndex.internalPointer();
  return TreeModel_ItemBasePtr (anItem);
}

// =======================================================================
// function :  reset
// purpose :
// =======================================================================
void TreeModel_ModelBase::Reset()
{
  for (int aColId = 0, aNbColumns = columnCount(); aColId < aNbColumns; aColId++)
  {
    TreeModel_ItemBasePtr aRootItem = RootItem (aColId);
    if (aRootItem)
      aRootItem->Reset();
  }
}

// =======================================================================
// function :  index
// purpose :
// =======================================================================
QModelIndex TreeModel_ModelBase::index (int theRow, int theColumn, const QModelIndex& theParent) const
{
  if (!hasIndex (theRow, theColumn, theParent))
    return QModelIndex();

  // to create index on the root item
  if (!theParent.isValid())
    return createIndex (theRow, theColumn, getIndexValue (RootItem (theColumn)));

  TreeModel_ItemBasePtr aParentItem;
  if (!theParent.isValid())
    aParentItem = RootItem (theColumn);
  else
    aParentItem = GetItemByIndex (theParent);

  TreeModel_ItemBasePtr aChildItem = aParentItem->Child (theRow, theColumn);
  return aChildItem ? createIndex (theRow, theColumn, getIndexValue (aChildItem)) : QModelIndex();
}

// =======================================================================
// function :  data
// purpose :
// =======================================================================
QVariant TreeModel_ModelBase::data (const QModelIndex& theIndex, int theRole) const
{
  if (!theIndex.isValid())
    return QVariant ("undefined");

  if (IsUseVisibilityColumn() && theIndex.column() == TreeModel_ColumnType_Visibility)
  {
    if (theRole != Qt::DecorationRole)
      return QVariant();

    TreeModel_ItemBasePtr anItem = GetItemByIndex (theIndex);
    if (!anItem->data (theIndex, theRole).isNull()) // value is already in cache
      return anItem->data (theIndex, theRole);

    if (!anItem->IsInitialized())
      anItem->Init();

    if (!myVisibilityState || !myVisibilityState->CanBeVisible (theIndex))
      return QVariant();

    QVariant aValue = myVisibilityState->IsVisible (theIndex) ? myVisibleIcon : myInvisibleIcon;
    anItem->SetCustomData (aValue, theRole);
    return aValue;
  }

  TreeModel_ItemBasePtr anItem = GetItemByIndex (theIndex);
  QVariant anItemData = anItem->data (theIndex, theRole);

  if (anItemData.isNull() && theRole == Qt::BackgroundRole && myHighlightedIndices.contains (theIndex))
    anItemData = TreeModel_Tools::LightHighlightColor();

  return anItemData;
}

// =======================================================================
// function :  parent
// purpose :
// =======================================================================
QModelIndex TreeModel_ModelBase::parent (const QModelIndex& theIndex) const
{
  if (!theIndex.isValid())
    return QModelIndex();

  TreeModel_ItemBasePtr aChildItem = GetItemByIndex (theIndex);
  TreeModel_ItemBasePtr aParentItem = aChildItem ? aChildItem->Parent() : TreeModel_ItemBasePtr();

  if (!aParentItem)
    return QModelIndex();

  return createIndex (aParentItem->Row(), aParentItem->Column(), getIndexValue (aParentItem));
}

// =======================================================================
// function :  flags
// purpose :
// =======================================================================
Qt::ItemFlags TreeModel_ModelBase::flags (const QModelIndex& theIndex) const
{
  if (!theIndex.isValid())
    return 0;
  return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}

// =======================================================================
// function : headerData
// purpose :
// =======================================================================
QVariant TreeModel_ModelBase::headerData (int theSection, Qt::Orientation theOrientation, int theRole) const
{
  if (theOrientation != Qt::Horizontal || theRole != Qt::DisplayRole)
    return QVariant();

  if (IsUseVisibilityColumn() && theSection == TreeModel_ColumnType_Visibility)
    return QVariant();

  return myHeaderValues[theSection].GetName();
}

// =======================================================================
// function :  rowCount
// purpose :
// =======================================================================
int TreeModel_ModelBase::rowCount (const QModelIndex& theParent) const
{
  // to create index on the root item
  if (!theParent.isValid())
    return 1;

  TreeModel_ItemBasePtr aParentItem;
  if (!theParent.isValid())
    aParentItem = RootItem (0);
  else
    aParentItem = GetItemByIndex (theParent);

  if (!aParentItem)
    return 0;

  return aParentItem ? aParentItem->rowCount() : 0;
}

// =======================================================================
// function : EmitLayoutChanged
// purpose :
// =======================================================================
void TreeModel_ModelBase::EmitLayoutChanged()
{
  emit layoutChanged();
}

// =======================================================================
// function : EmitLayoutChanged
// purpose :
// =======================================================================
void TreeModel_ModelBase::EmitDataChanged (const QModelIndex& theTopLeft, const QModelIndex& theBottomRight,
                                           const QVector<int>& theRoles,
                                           const bool isResetItem)
{
  TreeModel_ItemBasePtr anItemBase = TreeModel_ModelBase::GetItemByIndex (theTopLeft);
  if (anItemBase && isResetItem)
    anItemBase->Reset();

#if QT_VERSION < 0x050000
  (void)theRoles;
  emit dataChanged (theTopLeft, theBottomRight);
#else
  emit dataChanged (theTopLeft, theBottomRight, theRoles);
#endif
}

// =======================================================================
// function : Selected
// purpose :
// =======================================================================
QModelIndexList TreeModel_ModelBase::Selected (const QModelIndexList& theIndices, const int theCellId,
                                               const Qt::Orientation theOrientation)
{
  QModelIndexList aSelected;
  for (QModelIndexList::const_iterator anIndicesIt = theIndices.begin(); anIndicesIt != theIndices.end(); anIndicesIt++)
  {
    QModelIndex anIndex = *anIndicesIt;
    if ((theOrientation == Qt::Horizontal && anIndex.column() == theCellId) ||
        (theOrientation == Qt::Vertical && anIndex.row() == theCellId))
      aSelected.append (anIndex);
  }
  return aSelected;
}

// =======================================================================
// function : SingleSelected
// purpose :
// =======================================================================
QModelIndex TreeModel_ModelBase::SingleSelected (const QModelIndexList& theIndices, const int theCellId,
                                                 const Qt::Orientation theOrientation)
{
  QModelIndexList aSelected = Selected (theIndices, theCellId, theOrientation);
  return aSelected.size() == 1 ? aSelected.first() : QModelIndex();
}

// =======================================================================
// function :  SelectedItems
// purpose :
// =======================================================================
QList<TreeModel_ItemBasePtr> TreeModel_ModelBase::SelectedItems (const QModelIndexList& theIndices)
{
  QList<TreeModel_ItemBasePtr> anItems;

  for (QModelIndexList::const_iterator anIndicesIt = theIndices.begin(); anIndicesIt != theIndices.end(); anIndicesIt++)
  {
    TreeModel_ItemBasePtr anItem = TreeModel_ModelBase::GetItemByIndex (*anIndicesIt);
    if (!anItem || anItems.contains (anItem))
      continue;
    anItems.append (anItem);
  }
  return anItems;
}

// =======================================================================
// function : SubItemsPresentations
// purpose :
// =======================================================================
void TreeModel_ModelBase::SubItemsPresentations (const QModelIndexList& theIndices,
                                                 NCollection_List<Handle(Standard_Transient)>& thePresentations)
{
  QList<TreeModel_ItemBasePtr> anItems;

  for (QModelIndexList::const_iterator anIndicesIt = theIndices.begin(); anIndicesIt != theIndices.end(); anIndicesIt++)
  {
    TreeModel_ItemBasePtr anItem = TreeModel_ModelBase::GetItemByIndex (*anIndicesIt);
    if (!anItem || anItems.contains (anItem))
      continue;
    subItemsPresentations (anItem, thePresentations);
  }
}

// =======================================================================
// function : subItemPresentations
// purpose :
// =======================================================================
void TreeModel_ModelBase::subItemsPresentations (const TreeModel_ItemBasePtr& theItem,
                                                 NCollection_List<Handle(Standard_Transient)>& thePresentations)
{
  theItem->Presentations (thePresentations);

  QList<TreeModel_ItemBasePtr> anItems;
  for (int aRowId = 0; aRowId < theItem->rowCount(); aRowId++)
  {
    subItemsPresentations (theItem->Child (aRowId, theItem->Column()), thePresentations);
  }
}

// =======================================================================
// function : createRoot
// purpose :
// =======================================================================
void TreeModel_ModelBase::createRoot (const int theColumnId)
{
  myRootItems.insert (theColumnId, createRootItem (theColumnId));
}

// =======================================================================
// function : setHeaderItem
// purpose :
// =======================================================================
void TreeModel_ModelBase::setHeaderItem (const int theColumnId, const TreeModel_HeaderSection& theSection)
{
  if (theSection.IsEmpty())
  {
    // remove section
    myHeaderValues.remove (theColumnId);
    myRootItems.remove (theColumnId);
  }

  myHeaderValues[theColumnId] = theSection;
  createRoot (theColumnId);
}

// =======================================================================
// function :  getIndexValue
// purpose :
// =======================================================================
void* TreeModel_ModelBase::getIndexValue (const TreeModel_ItemBasePtr& theItem)
{
  return theItem.data();
}