/*
  Copyright 2010-2011 Grégory Soutadé

  This file is part of KissCount.

  KissCount 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 3 of the License, or
  (at your option) any later version.

  KissCount 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 KissCount.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <QtGui>
#include <QString>

#include "FormulaDelegate.hpp"
#include <ParseExp.hpp>
#include "../wxUI.hpp"
#include <iostream>

QWidget * FormulaDelegate::createEditor (QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    return new QLineEdit(parent);
}

void FormulaDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
				  const QModelIndex &index) const
{
    QLineEdit *line = qobject_cast<QLineEdit *>(editor);
    QString s ;
    double res = 0.0;
    QString value = line->text();
    struct ParseExp::parse_opt opt, *r;
    const char* c;
    char* str, *str2;
    bool ok;

    value = value.trimmed();
    if (value.startsWith("="))
    {
	value = value.replace(",", ".");
	c = value.toStdString().c_str();
	str2 = str = new char[strlen(c)];
	strcpy(str, c+1);
	memset(&opt, 0, sizeof(opt));
	r = &opt;
	try {
	    ParseExp::ParseExp(&str, r, false);
	}
	catch(...)
	{
	    QMessageBox::critical(0, _("Error"), _("Invalid formula !"));
	    delete[] str2;
	    return;
	}
	
	FormulaDelegate* _this = const_cast<FormulaDelegate*>(this); // hum hum ...
	_this->_operations->at(index.row()).formula = value;
	delete[] str2;
	res = ParseExp::EvaluateExpr(&opt, true);
	model->setData(index, qVariantFromValue(s.sprintf("%.2lf", res)));
    }
    else
    {
	res = value.toDouble(&ok);
	if (ok)
	    model->setData(index, qVariantFromValue(s.sprintf("%.2lf", res)));
    }

}

void FormulaDelegate::setEditorData(QWidget *editor,
				 const QModelIndex &index) const
{
    QLineEdit* line = qobject_cast<QLineEdit *>(editor);
    QString s = qVariantValue<QString>(index.data());

    if ((*_operations)[index.row()].formula.length())
	line->setText((*_operations)[index.row()].formula);
    else
	line->setText(s);
}