/****************************************************************************
** Copyright (c) 2013-2014 Debao Zhang <hello@debao.me>
** All right reserved.
**
** Permission is hereby granted, free of charge, to any person obtaining
** a copy of this software and associated documentation files (the
** "Software"), to deal in the Software without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be
** included in all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
** NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
** LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
** OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
** WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**
****************************************************************************/

#include "xlsxsheetmodel.h"
#include "xlsxsheetmodel_p.h"
#include "xlsxworksheet.h"

QT_BEGIN_NAMESPACE_XLSX

SheetModelPrivate::SheetModelPrivate(SheetModel *p)
    :q_ptr(p)
{

}

/*!
 * \class SheetModel
 *
 *  Helper class for gui applicaiton user
 *
 *  \note SheetModel indices start from 0, while Worksheet
 *  column/row indices start from 1.
 */

/*!
 * Creates a model object with the given \a sheet and \a parent.
 */
SheetModel::SheetModel(Worksheet *sheet, QObject *parent)
    :QAbstractTableModel(parent), d_ptr(new SheetModelPrivate(this))
{
    d_ptr->sheet = sheet;
}

/*!
 * Destroys the model.
 */
SheetModel::~SheetModel()
{
    delete d_ptr;
}

int SheetModel::rowCount(const QModelIndex &/*parent*/) const
{
    Q_D(const SheetModel);
    return d->sheet->dimension().lastRow();
}


int SheetModel::columnCount(const QModelIndex &/*parent*/) const
{
    Q_D(const SheetModel);
    return d->sheet->dimension().lastColumn();
}

Qt::ItemFlags SheetModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;
    return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsEditable;
}

QVariant SheetModel::data(const QModelIndex &index, int role) const
{
    Q_D(const SheetModel);

    if (!index.isValid())
        return QVariant();

    Cell *cell = d->sheet->cellAt(index.row()+1, index.column()+1);
    if (!cell)
        return QVariant();
    QVariant userFriendlyValue = d->sheet->read(index.row()+1, index.column()+1);

    if (role == Qt::DisplayRole) {
        if (cell->isDateTime())
            return userFriendlyValue;
        return cell->value();
    } else if (role == Qt::EditRole) {
        return userFriendlyValue;
    }

    return QVariant();
}

/*
 * Copy from xlsxutility.cpp, so this example don't depend on the xlsx-private
 * This function should be removed once this class moved to the xlsx library.
 */
static QString col_to_name(int col_num)
{
    QString col_str;

    int remainder;
    while (col_num) {
        remainder = col_num % 26;
        if (remainder == 0)
            remainder = 26;
        col_str.prepend(QChar('A'+remainder-1));
        col_num = (col_num - 1) / 26;
    }

    return col_str;
}

QVariant SheetModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (role == Qt::DisplayRole) {
        if (orientation == Qt::Horizontal)
            return col_to_name(section + 1);
        else
            return QString::number(section + 1);
    }
    return QVariant();
}

bool SheetModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    Q_D(const SheetModel);

    if (!index.isValid())
        return false;

    if (role == Qt::EditRole) {
        if (d->sheet->write(index.row()+1, index.column()+1, value) == 0)
            return true;
    }

    return false;
}

/*!
 * Returns the sheet object.
 */
Worksheet *SheetModel::sheet() const
{
    Q_D(const SheetModel);
    return d->sheet;
}

QT_END_NAMESPACE_XLSX