Formulation.hpp

#ifndef FORMULATION_H
#define FORMULATION_H
 
#include <memory>
#include <string>
#include <map>
#include <exception>
#include <vector>
 
#include "JSONProperty.hpp"
 
#include <boost/property_tree/ptree.hpp>
#include <boost/algorithm/string.hpp>
 
namespace realization {
 
    class Formulation {
        public:
            typedef long time_step_t;
 
            Formulation(std::string id) : id(id) {}
            
            virtual ~Formulation(){};
 
            virtual std::string get_formulation_type() const = 0;
 
            // TODO: to truly make this properly generalized (beyond catchments, and to some degree even in that
            //  context) a more complex type for the entirety of the response/output is needed, perhaps with independent
            //  access functions
 
            // TODO: a reference to the actual time of the initial time step is needed
 
            // TODO: a reference to the last calculated time step is needed
 
            // TODO: a mapping of previously calculated time steps to the size/delta of each is needed (unless we
            //  introduce a way to enforce immutable time step delta values for an object)
 
            // TODO: a convenience method for getting the actual time of calculated time steps (at least the last)
 
            std::string get_id() const {
                return this->id;
            }
 
            virtual void create_formulation(boost::property_tree::ptree &config, geojson::PropertyMap *global = nullptr) = 0;
            virtual void create_formulation(geojson::PropertyMap properties) = 0;
 
        protected:
 
            virtual const std::vector<std::string>& get_required_parameters() const = 0;
 
            geojson::PropertyMap interpret_parameters(boost::property_tree::ptree &config, geojson::PropertyMap *global = nullptr) {
                geojson::PropertyMap options;
 
                for (auto &formulation_parameter : config) {
                    options.emplace(formulation_parameter.first, geojson::JSONProperty(formulation_parameter.first, formulation_parameter.second));
                }
 
                if (global != nullptr) {
                    for(auto &global_option : *global) {
                        if (options.count(global_option.first) == 0) {
                            options.emplace(global_option.first, global_option.second);
                        }
                    }
                }
 
                validate_parameters(options);
 
                return options;
            }
 
            void validate_parameters(geojson::PropertyMap options) {
                std::vector<std::string> missing_parameters;
                std::vector<std::string> required_parameters = get_required_parameters();
 
                for (auto parameter : required_parameters) {
                  if (options.count(parameter) == 0) {
                        missing_parameters.push_back(parameter);
                    }
                }
 
                if (missing_parameters.size() > 0) {
                    std::string message = "A " + get_formulation_type() + " formulation cannot be created; the following parameters are missing: ";
 
                    for (int missing_parameter_index = 0; missing_parameter_index < missing_parameters.size(); missing_parameter_index++) {
                        message += missing_parameters[missing_parameter_index];
 
                        if (missing_parameter_index < missing_parameters.size() - 1) {
                            message += ", ";
                        }
                    }
                    
                    throw std::runtime_error(message);
                }
            }
 
            std::string id;
    };
 
}
#endif // FORMULATION_H