#include <QtGui>

 #include <iostream>

 using namespace std;

 #include "treeitem.h"

 #include "treemodel.h"

 TreeModel::TreeModel(QObject *parent)

     : QAbstractItemModel(parent)

 {

     QList<QVariant> rootData;

     rootData << "Heading" << "Type" <<"Note";

     rootItem = new TreeItem(rootData);

 }

 TreeModel::~TreeModel()

 {

     delete rootItem;

 }

 QVariant TreeModel::data(const QModelIndex &index, int role) const

 {

     if (!index.isValid())

         return QVariant();

     if (role != Qt::DisplayRole)

         return QVariant();

     TreeItem *item = getItem (index);

     return item->data(index.column());

 }

 Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const

 {

     if (!index.isValid())

         return Qt::ItemIsEnabled;

     return Qt::ItemIsEnabled | Qt::ItemIsSelectable;

 }

 QVariant TreeModel::headerData(int section, Qt::Orientation orientation,

                                int role) const

 {

     if (orientation == Qt::Horizontal && role == Qt::DisplayRole)

         return rootItem->data(section);

     return QVariant();

 }

 QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent)

             const

 {

     TreeItem *parentItem;

     if (!parent.isValid())

         parentItem = rootItem;

     else

         parentItem = getItem (parent);

     TreeItem *childItem = parentItem->child(row);

     if (childItem)

         return createIndex(row, column, childItem);

     else

         return QModelIndex();

 }

 QModelIndex TreeModel::parent(const QModelIndex &index) const

 {

     if (!index.isValid())

         return QModelIndex();

     TreeItem *ti= getItem (index);

     TreeItem *parentItem = ti->parent();

 	//cout << "TreeModel::parent  ti="<<ti<<" "<<ti->getHeading().toStdString()<<"  pi="<<parentItem<<"  "<<endl;

     if (parentItem == rootItem)

         return QModelIndex();

 	if (!parentItem)

 	{

 		cout <<"TreeModel::parent      ti=="<<ti<<"  "<<ti->getHeading().toStdString()<<endl;

         return QModelIndex();	// FIXME-3 do this to avoid segfault, but why?

 		                        // see also my question on qt-interest in march

 	}	

     return createIndex(parentItem->childNumber(), 0, parentItem);

 }

 int TreeModel::rowCount(const QModelIndex &parent) const

 {

     TreeItem *parentItem;

     if (!parent.isValid())

         parentItem = rootItem;

     else

         parentItem = getItem (parent);

     return parentItem->childCount();

 }

 int TreeModel::columnCount(const QModelIndex &parent) const

 {

     if (parent.isValid())

         return getItem (parent)->columnCount();

     else

         return rootItem->columnCount();

 }

 TreeItem* TreeModel::next(TreeItem* &current, TreeItem* &previous, int &d0)

 {

 	// Walk through map beginning at current with previous==0

 	// Start at root, if current==NULL

 	if (!current) current=rootItem;

 	// Are we just beginning to walk the map?

 	if (!previous)

 	{

 		previous=current;

 		d0=current->depth();

 		current=current->getFirstBranch();

 		return current;

 	}

 	//std::cout << " cur="<<current->getHeading().toStdString();

 	//std::cout << " prev="<<previous->getHeading().toStdString()<<std::endl;

 	// Going up or down (deeper)?

 	if (current->depth() > previous->depth() )

 	{	

 		// Coming from above

 		// Trying  to go down deeper

 		if (current->branchCount() >0 )

 		{

 			previous=current;

 			current=current->getFirstBranch();

 			return current;

 		}	

 		// turn around and go up again

 	}	

 	// Coming from below,

 	// Trying to go down again to siblings

 	TreeItem *sibling=current->getBranchNum (previous->num()+1);

 	if (sibling)

 	{	

 		// Found sibling of previous, go there

 		previous=current;

 		current=sibling;

 		return current;

 	} 

 	// Go up and try to find siblings of current

 	previous=current;

 	current=current->parent();

 	// Check if we still can go somewhere

 	if (!current) return current;

 	while (current && current->depth() < previous->depth() )

 		next (current,previous,d0);

 	return current;

 }

 bool TreeModel::insertRows ( int row, int count, const QModelIndex & parent)

 {

 	std::cout << "TreeModel insertRows()\n";

 	int last=row+count-1;

 	beginInsertRows (parent,row,last);

 	for (int i=row; i<=last; i++)

 	{

 		std::cout << "TreeModel::insertRows inserting i="<<i<<std::endl;

 	}

 	endInsertRows ();

 	return true;

 }

 bool TreeModel::removeRows ( int row, int count, const QModelIndex & parent)

 {

 	int last=row+count-1;

 	cout << "TreeModel::removeRows row="<<row<<"  count="<<count<<"  last="<<last<<endl;

     TreeItem *pi= getItem (parent);

 	cout << "  pi="<<pi<<"  "<<pi->getHeading().toStdString()<<endl;

 	beginRemoveRows (parent,row,last);

 	for (int i=row; i<=last; i++)

 	{

 		cout << "TreeModel::removeRows removing i="<<i<<std::endl;

 		pi->removeChild (row);

 	}

 	endRemoveRows ();

 	return true;

 }

 TreeItem *TreeModel::getItem(const QModelIndex &index) const

 {

     if (index.isValid()) {

 		TreeItem *item = static_cast<TreeItem*>(index.internalPointer());

         if (item) return item;

     }

     return rootItem;

 }

 QModelIndex TreeModel::index (TreeItem* ti)

 {

 	return createIndex (ti->row(),ti->column(),ti);

 }