/*    This file is part of the Gudhi Library. The Gudhi library
 *    (Geometric Understanding in Higher Dimensions) is a generic C++
 *    library for computational topology.
 *
 *    Author(s):       Pawel Dlotko
 *
 *    Copyright (C) 2015  INRIA (France)
 *
 *    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 3 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, see <http://www.gnu.org/licenses/>.
 */



#include <gudhi/reader_utils.h>
#include <gudhi/Persistence_intervals.h>

#include <iostream>
#include <vector>
#include <limits>



using namespace Gudhi;
using namespace Gudhi::Persistence_representations;


int main( int argc , char** argv )
{
	std::cout << "This program compute the range of birth and death times of persistence pairs in diagrams provided as an input. \n";
	std::cout << "The first parameter of the program is the dimension of persistence to be used. If your file contains ";
	std::cout << "the information about dimension of persistence pairs, please provide here the dimension of persistence pairs you want to use. If your input files consist only ";
	std::cout << "of birth-death pairs, please set this first parameter to -1 \n";	
	std::cout << "The remaining parameters of the program are the names of files with persistence diagrams. \n";
	
	int dim = atoi( argv[1] );
	unsigned dimension = std::numeric_limits<unsigned>::max();
	if ( dim >= 0 )
	{
		dimension = (unsigned)dim;
	}
	std::vector< const char* > filenames;
	for ( int i = 2 ; i < argc ; ++i )
	{
		filenames.push_back( argv[i] );
	}
	
	double min_ = std::numeric_limits<double>::max();
	double max_ = -std::numeric_limits<double>::max();
	
	for ( size_t file_no = 0 ; file_no != filenames.size() ; ++file_no )
	{
		std::cout << "Creating diagram based on a file : " << filenames[file_no] << std::endl;
		Persistence_intervals p( filenames[file_no] , dimension );
		std::pair<double,double> min_max_ = p.get_x_range();
		if ( min_max_.first < min_ )min_ = min_max_.first;
		if ( min_max_.second > max_ )max_ = min_max_.second;
	}
	std::cout << "Birth-death range : min: " <<  min_ << ", max: " << max_ << std::endl;
	return 0;
}