/*
 * Copyright (C) 2015  Ivan Romanov <drizt@land.ru>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include "abstracttreeitem.h"
#include "abstracttreemodel.h"

#include <QDebug>

AbstractTreeModel::AbstractTreeModel(AbstractTreeItem *root, QObject *parent)
	: QAbstractItemModel(parent)
	, _root(root)
{
}

AbstractTreeModel::~AbstractTreeModel()
{
	delete _root;
}

QModelIndex AbstractTreeModel::index(int row, int column, const QModelIndex &parent) const
{
	if (!hasIndex(row, column, parent))
		return QModelIndex();

	AbstractTreeItem *parentItem;

	if (!parent.isValid())
		parentItem = _root;
	else
		parentItem = static_cast<AbstractTreeItem*>(parent.internalPointer());

	AbstractTreeItem *childItem = 0;
	if (row >= 0 && row < parentItem->childCount())
		childItem = parentItem->children().at(row);

	if (childItem)
		return createIndex(row, column, childItem);
	else
		return QModelIndex();

}

QModelIndex	AbstractTreeModel::parent(const QModelIndex &index) const
{
	if (!index.isValid())
		return QModelIndex();

	AbstractTreeItem *childItem = static_cast<AbstractTreeItem*>(index.internalPointer());
	AbstractTreeItem *parentItem = childItem->parent();

	if (parentItem == _root)
		return QModelIndex();

	int row = 0;
	if (parentItem->parent())
		row = parentItem->row();

	return createIndex(row, 0, parentItem);
}

int	AbstractTreeModel::rowCount(const QModelIndex &parent) const
{
	if (parent.column() > 0)
		return 0;

	AbstractTreeItem *parentItem;
	if (!parent.isValid())
		parentItem = _root;
	else
		parentItem = static_cast<AbstractTreeItem*>(parent.internalPointer());

	return parentItem->children().size();
}

AbstractTreeItem *AbstractTreeModel::root() const
{
	return _root;
}
