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/*
    treemodel.cpp

    Provides a simple tree model to show how to create and use hierarchical
    models.
*/

#include <QtGui>


#include "treeitem.h"
#include "treemodel.h"
#include "data_base_management.h"

TreeModel::TreeModel(QObject *parent)
    : QAbstractItemModel(parent)
{
	connect(this,SIGNAL(beforeReset()),this,SIGNAL(modelAboutToBeReset()));
	connect(this,SIGNAL(reset()),this,SIGNAL(modelReset()));
}

//! [0]
TreeModel::TreeModel( QSqlQuery &sqlquery, QObject *parent)
    : QAbstractItemModel(parent),rootItem(0)
{
	//lo más probable es que el nodo raíz no necesite tener información
    QList<QVariant> rootData;
    rootData << "root"; //id 0, padre 0, title "root" (el id, y el id del padre van a ir en la clase TreeItem)
    rootItem = new TreeItem(rootData);
	rootItem->id = 0;
    setupModelData(sqlquery, rootItem);
}
//! [0]

//! [1]
TreeModel::~TreeModel()
{
    delete rootItem;
}
//! [1]

//! [2]
int TreeModel::columnCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return static_cast<TreeItem*>(parent.internalPointer())->columnCount();
    else
        return rootItem->columnCount();
}
//! [2]

//! [3]
QVariant TreeModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

	if (role == Qt::DecorationRole)
		return QVariant(QIcon(":/images/folder.png"));

    if (role != Qt::DisplayRole)
        return QVariant();

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

    return item->data(index.column());
}
//! [3]

//! [4]
Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return 0;

    return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}
//! [4]

//! [5]
QVariant TreeModel::headerData(int section, Qt::Orientation orientation,
                               int role) const
{
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
        return rootItem->data(section);

    return QVariant();
}
//! [5]

//! [6]
QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent)
            const
{
    if (!hasIndex(row, column, parent))
        return QModelIndex();

    TreeItem *parentItem;

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

    TreeItem *childItem = parentItem->child(row);
    if (childItem)
        return createIndex(row, column, childItem);
    else
        return QModelIndex();
}
//! [6]

//! [7]
QModelIndex TreeModel::parent(const QModelIndex &index) const
{
    if (!index.isValid())
        return QModelIndex();

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

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

    return createIndex(parentItem->row(), 0, parentItem);
}
//! [7]

//! [8]
int TreeModel::rowCount(const QModelIndex &parent) const
{
    TreeItem *parentItem;
    if (parent.column() > 0)
        return 0;

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

    return parentItem->childCount();
}
//! [8]

void TreeModel::setupModelData(QString path)
{
	emit(beforeReset());
	if(rootItem == 0)
		delete rootItem; //TODO comprobar que se libera bien la memoria

	//inicializar el nodo raíz
	QList<QVariant> rootData;
	rootData << "root"; //id 0, padre 0, title "root" (el id, y el id del padre van a ir en la clase TreeItem)
	rootItem = new TreeItem(rootData);
	rootItem->id = 0;

	//cargar la base de datos
	if(_database.isOpen())
		_database.close();
	_database = DataBaseManagement::loadDatabase(path);
	//crear la consulta
	QSqlQuery selectQuery("select * from folder order by parentId,name",_database);

	setupModelData(selectQuery,rootItem);
	_database.close();
	emit(reset());

}

void TreeModel::setupModelData(QSqlQuery &sqlquery, TreeItem *parent)
{
	//64 bits para la primary key, es decir la misma precisión que soporta sqlit 2^64
	//el diccionario permitirá encontrar cualquier nodo del árbol rápidamente, de forma que añadir un hijo a un padre sea O(1)
	QMap<unsigned long long int, TreeItem *> items;

	//se añade el nodo 0
	items.insert(parent->id,parent);

	while (sqlquery.next()) {
		QList<QVariant> data;
		data << sqlquery.value(2).toString();
		data << sqlquery.value(3).toString();
		TreeItem * item = new TreeItem(data);
		item->id = sqlquery.value(0).toLongLong();
		items.value(sqlquery.value(1).toLongLong())->appendChild(item);
		//se añade el item al map, de forma que se pueda encontrar como padre en siguientes iteraciones
		items.insert(item->id,item);
	}
}

QSqlDatabase & TreeModel::getDatabase()
{
	return _database;
}

QString TreeModel::getFolderPath(const QModelIndex &folder)
{
	return static_cast<TreeItem*>(folder.internalPointer())->data(1).toString();
}