/**
 * @file artis/observer/Observer.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_OBSERVER_HPP
#define ARTIS_OBSERVER_OBSERVER_HPP

#include <artis/kernel/AbstractModel.hpp>
#include <artis/observer/View.hpp>

#include <vector>

namespace artis {
    namespace observer {

        template<typename U, typename V>
        class Observer {
        public:
            typedef std::map<std::string, View<U, V>*> Views;

            Observer(const artis::kernel::AbstractModel<U, V>* model)
                    :
                    _model(model) { }

            virtual ~Observer()
            {
                for (typename Views::iterator it = _views.begin(); it != _views.end();
                     ++it) {
                    delete it->second;
                }
            }

            void attachView(const std::string& name, View<U, V>* view)
            {
                _views[name] = view;
                view->attachModel(_model);
            }

            Views* cloneViews() const
            {
                Views* v = new Views();

                for (typename Views::const_iterator it = _views.begin();
                     it != _views.end(); ++it) {
                    (*v)[it->first] = it->second->clone();
                }
                return v;
            }

            const View<U, V>& view(const std::string& name) const { return *_views.find(name)->second; }

            const Views& views() const { return _views; }

            void init() { }

            void observe(double t)
            {
                for (typename Views::iterator it = _views.begin(); it != _views.end();
                     ++it) {
                    it->second->observe(t);
                }
            }

        private:
            const artis::kernel::AbstractModel<U, V>* _model;
            Views _views;
        };

    }
}

#endif