/**
 * @file artis/observer/Output.hpp
 * @author See the AUTHORS file
 */

/*
 * Copyright (C) 2012-2019 ULCO http://www.univ-littoral.fr
 *
 * 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/>.
 */

#ifndef ARTIS_OBSERVER_OUTPUT_HPP
#define ARTIS_OBSERVER_OUTPUT_HPP

#include <artis/observer/Observer.hpp>
#include <artis/observer/View.hpp>
#include <artis/utils/DateTime.hpp>

#include <boost/format.hpp>

namespace artis {
    namespace observer {

        template<typename U, typename V>
        class Output {
        public:
            Output(const Observer<U, V>& observer)
                    :_observer(observer) { }

            virtual ~Output() { }

            void operator()(const std::string& path = "") const
            {
                const typename Observer<U, V>::Views& views = _observer.views();

                for (typename Observer<U, V>::Views::const_iterator it =
                        views.begin(); it != views.end(); ++it) {
                    std::ofstream o((boost::format("%1%/%2%.csv") % path %
                            it->first).str());
                    typename View<U, V>::Values values = it->second->values();
                    double begin = it->second->begin();
                    double end = it->second->end();

                    o.precision(10);
                    // write header
                    o << "time";
                    for (typename View<U, V>::Values::const_iterator
                                 itv = values.begin(); itv != values.end(); ++itv) {
                        o << ";" << itv->first;
                    }
                    o << std::endl;

                    // write values
                    for (double t = begin; t <= end; ++t) {
                        o << utils::DateTime::toJulianDay(t);
                        // o << t;
                        for (typename View<U, V>::Values::const_iterator itv =
                                values.begin(); itv != values.end(); ++itv) {
                            typename View<U, V>::Value::const_iterator itp =
                                    itv->second.begin();

                            while (itp != itv->second.end() and itp->first < t) {
                                ++itp;
                            }
                            o << ";";
                            if (itp != itv->second.end()) {
                                o << itp->second;
                            } else {
                                o << "NA";
                            }
                        }
                        o << std::endl;
                    }
                }
            }

        private:
            const Observer<U, V>& _observer;
        };

    }
}

#endif