Layer.hpp

#ifndef __NGEN_LAYER__
#define __NGEN_LAYER__
 
#include <NGenConfig.h>
 
#include "LayerData.hpp"
#include "Simulation_Time.hpp"
#include "State_Exception.hpp"
 
#if NGEN_WITH_MPI
#include "HY_Features_MPI.hpp"
#else
#include "HY_Features.hpp"
#endif
 
namespace ngen
{
 
    class Layer
    {    
        public:
 
        #if NGEN_WITH_MPI
            using feature_type = hy_features::HY_Features_MPI;
        #else
            using feature_type = hy_features::HY_Features;
        #endif
 
        Layer(
                const LayerDescription& desc, 
                const std::vector<std::string>& p_u, 
                const Simulation_Time& s_t, 
                feature_type& f, 
                geojson::GeoJSON cd, 
                long idx) :
            description(desc),
            processing_units(p_u),
            simulation_time(s_t),
            features(f),
            catchment_data(cd),
            output_time_index(idx)
        {
 
        }
 
        Layer(
                const LayerDescription& desc, 
                const Simulation_Time& s_t, 
                feature_type& f,
                long idx) :
            description(desc),
            simulation_time(s_t),
            features(f),
            output_time_index(idx)
        {
 
        }
 
        virtual ~Layer() {}
 
 
        time_t next_timestep_epoch_time() { return simulation_time.next_timestep_epoch_time(); }
 
 
 
        time_t current_timestep_epoch_time() { return simulation_time.get_current_epoch_time(); }
 
 
 
        int get_id() const { return this->description.id; }
 
 
        const std::string& get_name() const { return this->description.name; }
 
 
        const double get_time_step() const { return this->description.time_step; }
 
 
        const std::string& get_time_step_units() const { return this->description.time_step_units; }
 
 
        virtual void update_models()
        {
            auto idx = simulation_time.next_timestep_index();
            auto step = simulation_time.get_output_interval_seconds();
            
            //std::cout<<"Output Time Index: "<<output_time_index<<std::endl;
            if(output_time_index%100 == 0) std::cout<<"Running timestep " << output_time_index <<std::endl;
            std::string current_timestamp = simulation_time.get_timestamp(output_time_index);
            for(const auto& id : processing_units) 
            {
                int sub_time = output_time_index;
                //std::cout<<"Running cat "<<id<<std::endl;
                auto r = features.catchment_at(id);
                //TODO redesign to avoid this cast
                auto r_c = std::dynamic_pointer_cast<realization::Catchment_Formulation>(r);
                double response(0.0);
                try{
                    response = r_c->get_response(output_time_index, simulation_time.get_output_interval_seconds());
                }
                catch(models::external::State_Exception& e){
                    std::string msg = e.what();
                    msg = msg+" at timestep "+std::to_string(output_time_index)
                             +" ("+current_timestamp+")"
                             +" at feature id "+id;
                    throw models::external::State_Exception(msg);
                }
                std::string output = std::to_string(output_time_index)+","+current_timestamp+","+
                                    r_c->get_output_line_for_timestep(output_time_index)+"\n";
                r_c->write_output(output);
                //TODO put this somewhere else.  For now, just trying to ensure we get m^3/s into nexus output
                double area;
                try{
                    area = catchment_data->get_feature(id)->get_property("areasqkm").as_real_number();
                }
                catch(std::invalid_argument &e)
                {
                    area = catchment_data->get_feature(id)->get_property("area_sqkm").as_real_number();
                }
                double response_m_s = response * (area * 1000000);
                //TODO put this somewhere else as well, for now, an implicit assumption is that a module's get_response returns
                //m/timestep
                //since we are operating on a 1 hour (3600s) dt, we need to scale the output appropriately
                //so no response is m^2/hr...m^2/hr * 1hr/3600s = m^3/hr
                double response_m_h = response_m_s / 3600.0;
                //update the nexus with this flow
                for(auto& nexus : features.destination_nexuses(id)) {
                    //TODO in a DENDRITIC network, only one destination nexus per catchment
                    //If there is more than one, some form of catchment partitioning will be required.
                    //for now, only contribute to the first one in the list
                    if(nexus == nullptr){
                        throw std::runtime_error("Invalid (null) nexus instantiation downstream of "+id+". "+SOURCE_LOC);
                    }
                    nexus->add_upstream_flow(response_m_h, id, output_time_index);
                    /*std::cerr << "Add water to nexus ID = " << nexus->get_id() << " from catchment ID = " << id << " value = "
                              << response << ", ID = " << id << ", time-index = " << output_time_index << std::endl; */
                    break;
                }
                
            } //done catchments   
 
            ++output_time_index;
            if ( output_time_index < simulation_time.get_total_output_times() )
            {
                simulation_time.advance_timestep();
            }       
        }
        
 
        protected:
 
        const LayerDescription description;
        //TODO is this really required at the top level?
        //See "minimum" constructor above used for DomainLayer impl...
        const std::vector<std::string> processing_units;
        Simulation_Time simulation_time;
        feature_type& features;
        //TODO is this really required at the top level? or can this be moved to SurfaceLayer?
        const geojson::GeoJSON catchment_data;
        long output_time_index;       
 
    };
}
 
#endif