/**
 * @file
 * @author  Caleb Fangmeier <caleb@fangmeier.tech>
 * @version 0.1
 *
 * @section LICENSE
 *
 *
 * MIT License
 *
 * Copyright (c) 2017 Caleb Fangmeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef container_hpp
#define container_hpp

#include <typeindex>
#include <vector>
#include <map>

#include "value.hpp"

template
class std::vector<std::vector<float> >;

template
class std::vector<std::vector<int> >;


namespace fv_util {
    std::string get_type_name(const std::type_index &index) {
        std::map<std::type_index, std::string> _map;
        // Add to this list as needed :)
        _map[typeid(int)] = "int";
        _map[typeid(unsigned int)] = "unsigned int";
        _map[typeid(float)] = "float";
        _map[typeid(double)] = "double";
        _map[typeid(std::vector<int>)] = "std::vector<int>";
        _map[typeid(std::vector<float>)] = "std::vector<float>";
        _map[typeid(std::pair<std::vector<float>, std::vector<float>>)] = "std::pair<std::vector<float>,std::vector<float>>";
        _map[typeid(std::vector<std::pair<float, int>>)] = "std::vector<std::pair<float,int>>";
        _map[typeid(std::map<std::string, std::string>)] = "std::map<std::string,std::string>";

        if (_map[index] == "") {
            CRITICAL("Cannot lookup type name of \"" << index.name() << "\"");
        }
        return _map[index];
    }
}

namespace fv {

/**
 * Enumeration of different options that can be used to save Containers. Not
 * all options are allowed for all Containers.
 */
    enum SaveOption {
        PNG = 0,
        PDF = 1,
        ROOT = 2
    };

/**
 * Generic, untyped parent class of Container. Used to allow for placing
 * Containers of disparate types in common data structures.
 */
    class GenContainer {
    private:
        std::string name;
        std::string desc;
    public:
        GenContainer(const std::string name, const std::string &desc)
                : name(name), desc(desc) {}

        GenContainer(const std::string name)
                : GenContainer(name, "N/A") {}

        void set_description(const std::string &description) {
            desc = description;
        }

        const std::string &get_name() {
            return name;
        }

        virtual const std::string get_value_name() {
            return "N/A";
        }

        virtual void save_as(const std::string &fname, const SaveOption &option) = 0;

        virtual void save(const SaveOption &option = SaveOption::PNG) {
            save_as(get_name(), option);
        }
    };

/**
 * A class that is used to "hold" values. When an event is loaded the
 * \c fill() method is called and the Container can access the stored Value
 * object to process it. For example, if the Container is a ROOT Histogram
 * object, it may call <tt>container->Fill(value->get_value())</tt>.
 */
    template<typename H, typename V>
    class Container : public GenContainer {
    protected:
        H *container;
    public:
        Container(const std::string &name)
                : GenContainer(name),
                  container(nullptr) {}

        virtual ~Container() {
            if (container != nullptr) delete container;
        }

        virtual H *get_container() {
            return container;
        }
    };

/**
 * Prints out the value registered to it
 */
    template<typename T>
    class Logger : public Container<std::ostream, T> {
    private:
        using to_str_t = std::function<void(T, std::ostream &)>;
        to_str_t value_to_string;
        std::string logger_name;

        static void default_to_string(T &t, std::ostream &os) {
            os << t;
        }

    public:
        void fill(const T& the_value) {
            auto &os = (*this->container);
            std::stringstream vs;
            os << this->get_name() << std::endl;
            if (value_to_string != nullptr) value_to_string(the_value, vs);
            else default_to_string(the_value, vs);
            for (const char &c : vs.str()) {
                if (c == '\n') os << std::endl << "  ";
                else os << c;
            }
            os << std::endl;
        }

        Logger(std::ostream *out, const std::string& logger_name, to_str_t value_to_string = nullptr)
                : Container<std::ostream, T>("Logger:" + logger_name),
                  value_to_string(value_to_string), logger_name(logger_name) {
            this->container = out;
        }

        std::ostream *get_container() {
            return this->container;
        }

        void save_as(const std::string &, const SaveOption &) {}
    };

}
#endif // container_hpp