#include <QtGui>

#include <iostream>

using namespace std;

#include "attributeitem.h"

#include "branchitem.h"

#include "imageitem.h"

#include "treeitem.h"

#include "treemodel.h"

#include "xlinkitem.h"

TreeModel::TreeModel(QObject *parent)

    : QAbstractItemModel(parent)

{

    QList<QVariant> rootData;

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

    rootItem = new BranchItem(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::NoItemFlags;

    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 (TreeItem* ti)

{

	if (!ti->parent())

		return QModelIndex();

	else	

		return createIndex (ti->row(),0,ti);

}

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

            const

{

	// Make sure to return invalid index for invalid values (see modeltest)

	if (row<0 || column<0) return QModelIndex();

	if (column!=0) return QModelIndex();

    TreeItem *parentItem;

    if (!parent.isValid())

	{

        parentItem = rootItem;

		/*

		cout << "TM::index()  no parent?! xxx\n";

		cout << "   row="<<row<<"  col="<<column<<endl;

		cout << "   parent.internal="<< parent.internalPointer()<<endl;

		*/

		// Somehow index is requested where parentIndex is invalid.

		// what's happening here...?

		// Check if Qt examples also return index of rootIem then...

	}	

    else

        parentItem = getItem (parent);

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

	//cout << "TM::index  parentItem="<<parentItem<<"  childItem="<<childItem<<"  row="<<row<<" col="<<column<<endl;

    if (childItem)

        return createIndex(row, column, childItem);

    else

        return QModelIndex();

}

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

{

    if (!index.isValid())

        return QModelIndex();

	//FIXME-3 cout << "TM::parent  ri="<<rootItem<< "  row="<<index.row()<<"  col="<<index.column()<<endl;

    TreeItem *ti= getItem (index);

	//cout << "            ti="<<ti<<endl;

	//cout << "               "<<ti->getHeadingStd()<<endl;

    TreeItem *parentItem = ti->parent();

	//cout << "            pi="<<parentItem<<endl;

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

    if (parentItem == rootItem)

        return QModelIndex();

/*

	if (!parentItem)

        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

{

	int c;

    if (parent.isValid())

	{

        c= getItem (parent)->columnCount();

		//cout << "TM::colCount  c="<<c<<"  parent="<<getItem (parent)<<endl;	

	}

    else

	{

        c= rootItem->columnCount();

		//cout << "TM::colCount  c="<<c<<"  parent=invalid"<<endl;	

	}

	return c;

}

BranchItem* TreeModel::next(BranchItem* &current, BranchItem* &previous, BranchItem* start)	// FIXME-3 change this to nextBranch and use "next" for all TIs

{

/*FIXME-3	cout << "TM::next \n"; 

	std::string ch="()"; if (current) ch=current->getHeadingStd();

	std::string ph="()"; if (previous) ph=previous->getHeadingStd();

	cout << "  cur="<<ch << " prev="<<ph<<endl;

*/

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

	// Start at root, if current==NULL

	if (!current) current=(BranchItem*)rootItem;

	// Are we just beginning to walk the map?

	if (!previous)

	{

		if (!start) start=current;

		previous=current;

		current=current->getFirstBranch();

		return current;

	}

	// Going up or down (deeper)?

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

	{	

		// Coming from above

		// Trying  to go down deeper

//		cout << "  trying to go deeper\n";

		if (current->branchCount() >0 )

		{

//			cout << "  yes, going deeper\n";

			previous=current;

			current=current->getFirstBranch();

			return current;

		}	

		// turn around and go up again

//		cout << "  sorry, turn around\n";

		BranchItem *bi=current;

		current=previous;

		previous=bi;

	}	

/*

	cout << "  coming from below\n";

	ch="()"; if (current) ch=current->getHeadingStd();

	ph="()"; if (previous) ph=previous->getHeadingStd();

	cout << "  cur="<<ch << " prev="<<ph<<endl;

*/	

	// Coming from below

	// Trying to go down again to siblings

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

//	cout <<"    prev->num()="<<previous->num()<<endl;

	if (sibling)

	{	

		// Found sibling of previous, go there

//		cout << "  sib=cur="<<sibling->getHeadingStd()<<endl;

		previous=current;

		current=sibling;

		return current;

	} 

	// If we only needed to go through subtree, we are done now

	if (start==current) return NULL;

	// Go up and try to find siblings of current

//	cout <<"  going up again...\n";

	previous=current;

	current=(BranchItem*)current->parent();

	// Check if we still can go somewhere

	if (!current) return current;

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

		current=next (current,previous,start);

	return current;

}

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

{

	int last=row+count-1;

    TreeItem *pi;

	if (parent.isValid())

		pi=getItem (parent);

	else

		pi=rootItem;

	TreeItem *ti;

	//cout << "TM::removeRows  pi="<<pi<<"  row="<<row<<"  count="<<count<<endl;

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

	{

		ti=pi->getChildNum (row);

		pi->removeChild (row);	// does not delete object!

		delete ti;

	}

	return true;

}

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

{

    if (index.isValid()) {

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

        if (item) return item;

    }

    return NULL;

}

BranchItem *TreeModel::getRootItem()

{

	return rootItem;

}