/*************************************************************************************
 *  Copyright (C) 2014 by Percy Camilo T. Aucahuasi <percy.camilo.ta@gmail.com>      *
 *                                                                                   *
 *  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 program; if not, write to the Free Software                      *
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
 *************************************************************************************/

#include "listcommands.h"

#include <QCoreApplication>

#include "expression.h"
#include "list.h"
#include "value.h"

using Analitza::Expression;
using Analitza::ExpressionType;

const QString RangeCommand::id = QString("range");
const ExpressionType RangeCommand::type = 	ExpressionType(ExpressionType::Lambda)
.addParameter(ExpressionType(ExpressionType::Any, ExpressionType(ExpressionType::Value)))
.addParameter(ExpressionType(ExpressionType::List, ExpressionType(ExpressionType::Value)));

Expression RangeCommand::operator()(const QList< Analitza::Expression >& args)
{
	Expression ret;
	
	const int nargs = args.size();
	
	double a = 1;
	double b = 0;
	double h = 1;
	
	switch(nargs) {
		case 0: {
			ret.addError(QCoreApplication::tr("Invalid parameter count for '%1'").arg(RangeCommand::id));
			
			return ret;
		}	break;
		case 1: {
			b = static_cast<const Analitza::Cn*>(args.first().tree())->value();
		}	break;
		case 2: {
			a = static_cast<const Analitza::Cn*>(args.first().tree())->value();
			b = static_cast<const Analitza::Cn*>(args.last().tree())->value();
		}	break;
		case 3: {
			a = static_cast<const Analitza::Cn*>(args.at(0).tree())->value();
			b = static_cast<const Analitza::Cn*>(args.at(1).tree())->value();
			h = static_cast<const Analitza::Cn*>(args.at(2).tree())->value();
		}	break;
		default:
			ret.addError(QCoreApplication::tr("Invalid parameter count for '%1'").arg(RangeCommand::id));
			
			return ret;
			break;
	}
	
	Analitza::List *seq = new Analitza::List;
		
	for (double x = a; x <= b; x += h)
		seq->appendBranch(new Analitza::Cn(x));
	
	ret.setTree(seq);
	
	return ret;
}
